DOCKER(1)                                               Docker User Manuals                                               DOCKER(1)

       docker-run - Create and run a new container from an image

       docker  run  [-a|--attach[=[]]]  [--add-host[=[]]] [--annotation[=[]]] [--blkio-weight[=[BLKIO-WEIGHT]]] [--blkio-weight-de‐
       vice[=[]]]  [-c|--cpu-shares[=0]]  [--cap-add[=[]]]  [--cap-drop[=[]]]   [--cgroupns[=[]]]   [--cgroup-parent[=CGROUP-PATH]]
       [--cidfile[=CIDFILE]]   [--cpu-count[=0]]  [--cpu-percent[=0]]  [--cpu-period[=0]]  [--cpu-quota[=0]]  [--cpu-rt-period[=0]]
       [--cpu-rt-runtime[=0]] [--cpus[=0.0]] [--cpuset-cpus[=CPUSET-CPUS]] [--cpuset-mems[=CPUSET-MEMS]]  [-d|--detach]  [--detach-
       keys[=[]]]  [--device[=[]]]  [--device-cgroup-rule[=[]]] [--device-read-bps[=[]]] [--device-read-iops[=[]]] [--device-write-
       bps[=[]]]  [--device-write-iops[=[]]]  [--dns[=[]]]  [--dns-option[=[]]]   [--dns-search[=[]]]   [--domainname[=DOMAINNAME]]
       [-e|--env[=[]]]  [--entrypoint[=ENTRYPOINT]] [--env-file[=[]]] [--expose[=[]]] [--group-add[=[]]] [-h|--hostname[=HOSTNAME]]
       [--help] [--init]  [-i|--interactive]  [--ip[=IPv4-ADDRESS]]  [--ip6[=IPv6-ADDRESS]]  [--ipc[=IPC]]  [--isolation[=default]]
       [--kernel-memory[=KERNEL-MEMORY]]   [-l|--label[=[]]]   [--label-file[=[]]]   [--link[=[]]]  [--link-local-ip[=[]]]  [--log-
       driver[=[]]] [--log-opt[=[]]]  [-m|--memory[=MEMORY]]  [--mac-address[=MAC-ADDRESS]]  [--memory-reservation[=MEMORY-RESERVA‐
       TION]]  [--memory-swap[=LIMIT]]  [--memory-swappiness[=MEMORY-SWAPPINESS]]  [--mount[=[MOUNT]]]  [--name[=NAME]] [--network-
       alias[=[]]]  [--network[="bridge"]]  [--oom-kill-disable]   [--oom-score-adj[=0]]   [-P|--publish-all]   [-p|--publish[=[]]]
       [--pid[=[PID]]] [--userns[=[]]] [--pids-limit[=PIDS_LIMIT]] [--privileged] [--read-only] [--restart[=RESTART]] [--rm] [--se‐
       curity-opt[=[]]]  [--storage-opt[=[]]]   [--stop-signal[=SIGNAL]]   [--stop-timeout[=TIMEOUT]]   [--shm-size[=[]]]   [--sig-
       proxy[=true]]    [--sysctl[=[]]]    [-t|--tty]   [--tmpfs[=[CONTAINER-DIR[:OPTIONS]]]   [-u|--user[=USER]]   [--ulimit[=[]]]
       [--uts[=[]]]    [-v|--volume[=[[HOST-DIR:]CONTAINER-DIR[:OPTIONS]]]]    [--volume-driver[=DRIVER]]     [--volumes-from[=[]]]
       [-w|--workdir[=WORKDIR]] IMAGE [COMMAND] [ARG...]

       Run a process in a new container. docker run starts a process with its own file system, its own networking, and its own iso‐
       lated process tree. The IMAGE which starts the process may define defaults related to the process that will be  run  in  the
       container,  the  networking  to  expose,  and  more, but docker run gives final control to the operator or administrator who
       starts the container from the image. For that reason docker run has more options than any other Docker command.

       If the IMAGE is not already loaded then docker run will pull the IMAGE, and all image dependencies, from the  repository  in
       the same way running docker pull IMAGE, before it starts the container from that image.

       -a, --attach=[]
          Attach to STDIN, STDOUT or STDERR.

       In  foreground mode (the default when -d is not specified), docker run can start the process in the container and attach the
       console to the process's standard input, output, and standard error. It can even pretend to be a TTY (this is what most com‐
       mandline executables expect) and pass along signals. The -a option can be set for each of stdin, stdout, and stderr.

          Add a custom host-to-IP mapping (host:ip)

       Add a line to /etc/hosts. The format is hostname:ip.  The --add-host option can be set multiple times.

          Add an annotation to the container (passed through to the OCI runtime).

       The annotations are provided to the OCI runtime.

          Block IO weight (relative weight) accepts a weight value between 10 and 1000.

          Block IO weight (relative device weight, format: DEVICE_NAME:WEIGHT).

       -c, --cpu-shares=0
          CPU shares (relative weight)

       By  default,  all  containers  get  the  same proportion of CPU cycles. This proportion can be modified by changing the con‐
       tainer's CPU share weighting relative to the weighting of all other running containers.

       To modify the proportion from the default of 1024, use the -c or --cpu-shares flag to set the weighting to 2 or higher.

       The proportion will only apply when CPU-intensive processes are running.  When tasks in one container are idle,  other  con‐
       tainers  can  use the left-over CPU time. The actual amount of CPU time will vary depending on the number of containers run‐
       ning on the system.

       For example, consider three containers, one has a cpu-share of 1024 and two others have a cpu-share  setting  of  512.  When
       processes  in  all three containers attempt to use 100% of CPU, the first container would receive 50% of the total CPU time.
       If you add a fourth container with a cpu-share of 1024, the first container only gets 33% of the CPU. The remaining contain‐
       ers receive 16.5%, 16.5% and 33% of the CPU.

       On  a  multi-core  system, the shares of CPU time are distributed over all CPU cores. Even if a container is limited to less
       than 100% of CPU time, it can use 100% of each individual CPU core.

       For example, consider a system with more than three cores. If you start one container {C0} with -c=512 running one  process,
       and another container {C1} with -c=1024 running two processes, this can result in the following division of CPU shares:

              PID    container    CPU  CPU share
              100    {C0}         0    100% of CPU0
              101    {C1}         1    100% of CPU1
              102    {C1}         2    100% of CPU2

          Add Linux capabilities

          Drop Linux capabilities

          Set the cgroup namespace mode for the container.
            host:    run the container in the host's cgroup namespace
            private: run the container in its own private cgroup namespace
            "":      (unset) use the daemon's default configuration (host on cgroup v1, private on cgroup v2)

          Path  to  cgroups under which the cgroup for the container will be created. If the path is not absolute, the path is con‐
       sidered to be relative to the cgroups path of the init process. Cgroups will be created if they do not already exist.

          Write the container ID to the file

           Limit the number of CPUs available for execution by the container.

              On Windows Server containers, this is approximated as a percentage of total CPU usage.

              On Windows Server containers, the processor resource controls are mutually exclusive, the order of precedence is CPUCount first, then CPUShares, and CPUPercent last.

           Limit the percentage of CPU available for execution by a container running on a Windows daemon.

              On Windows Server containers, the processor resource controls are mutually exclusive, the order of precedence is CPUCount first, then CPUShares, and CPUPercent last.

          Limit the CPU CFS (Completely Fair Scheduler) period

       Limit the container's CPU usage. This flag tell the kernel to restrict the container's CPU usage to the period you specify.

          CPUs in which to allow execution (0-3, 0,1)

          Memory nodes (MEMs) in which to allow execution (0-3, 0,1). Only effective on NUMA systems.

       If you have four memory nodes on your system (0-3), use --cpuset-mems=0,1 then processes in your Docker container will  only
       use memory from the first two memory nodes.

          Limit the CPU CFS (Completely Fair Scheduler) quota

       Limit  the  container's  CPU  usage. By default, containers run with the full CPU resource. This flag tell the kernel to re‐
       strict the container's CPU usage to the quota you specify.

          Limit the CPU real-time period in microseconds

       Limit the container's Real Time CPU usage. This flag tell the kernel to restrict the container's Real Time CPU usage to  the
       period you specify.

          Limit the CPU real-time runtime in microseconds

       Limit  the containers Real Time CPU usage. This flag tells the kernel to limit the amount of time in a given CPU period Real
       Time tasks may consume. Ex:
          Period of 1,000,000us and Runtime of 950,000us means that this container could consume 95% of available CPU and leave the
       remaining 5% to normal priority tasks.

       The sum of all runtimes across containers cannot exceed the amount allotted to the parent cgroup.

          Number of CPUs. The default is 0.0 which means no limit.

       -d, --detach=true|false
          Detached mode: run the container in the background and print the new container ID. The default is false.

       At  any  time  you  can run docker ps in the other shell to view a list of the running containers. You can reattach to a de‐
       tached container with docker attach.

       When attached in the tty mode, you can detach from the container (and leave it running) using a configurable  key  sequence.
       The  default  sequence  is  CTRL-p CTRL-q.  You configure the key sequence using the --detach-keys option or a configuration
       file.  See config-json(5) for documentation on using a configuration file.

          Override the key sequence for detaching a container; key is a single character from the [a-Z] range, or ctrl-value, where
       value is one of: a-z, @, ^, [, ,, or _.

          Add a host device onhost to the container under the incontainer name.  Optional mode parameter can be used to specify de‐
       vice permissions, it is a combination of r (for read), w (for write), and m (for mknod(2)).

       For example, --device=/dev/sdc:/dev/xvdc:rwm will give a container all permissions for the host  device  /dev/sdc,  seen  as
       /dev/xvdc inside the container.

       --device-cgroup-rule="type major:minor mode"
          Add  a  rule  to  the cgroup allowed devices list. The rule is expected to be in the format specified in the Linux kernel
       documentation (Documentation/cgroup-v1/devices.txt):
            - type: a (all), c (char), or b (block);
            - major and minor: either a number, or * for all;
            - mode: a composition of r (read), w (write), and m (mknod(2)).

       Example: --device-cgroup-rule "c 1:3 mr": allow for a character device idendified by 1:3  to be created and read.

          Limit read rate from a device (e.g. --device-read-bps=/dev/sda:1mb)

          Limit read rate from a device (e.g. --device-read-iops=/dev/sda:1000)

          Limit write rate to a device (e.g. --device-write-bps=/dev/sda:1mb)

          Limit write rate to a device (e.g. --device-write-iops=/dev/sda:1000)

          Set custom DNS search domains (Use --dns-search=. if you don't wish to set the search domain)

          Set custom DNS options

          Set custom DNS servers

       This option can be used to override the DNS configuration passed to the container. Typically this is necessary when the host
       DNS configuration is invalid for the container (e.g., When this is the case the --dns flags is necessary for ev‐
       ery run.

          Container NIS domain name

       Sets the container's NIS domain name (see also setdomainname(2)) that is
          available inside the container.

       -e, --env=[]
          Set environment variables

       This option allows you to specify arbitrary environment variables that are available for the process that will  be  launched
       inside of the container.

          Overwrite the default ENTRYPOINT of the image

       This  option allows you to overwrite the default entrypoint of the image that is set in the Dockerfile. The ENTRYPOINT of an
       image is similar to a COMMAND because it specifies what executable to run when the container starts, but it  is  (purposely)
       more  difficult to override. The ENTRYPOINT gives a container its default nature or behavior, so that when you set an ENTRY‐
       POINT you can run the container as if it were that binary, complete with default options, and you can pass in  more  options
       via the COMMAND. But, sometimes an operator may want to run something else inside the container, so you can override the de‐
       fault ENTRYPOINT at runtime by using a --entrypoint and a string to specify the new ENTRYPOINT.

          Read in a line delimited file of environment variables

          Expose a port, or a range of ports (e.g. --expose=3300-3310) informs Docker that the container listens on  the  specified
       network ports at runtime. Docker uses this information to interconnect containers using links and to set up port redirection
       on the host system.

          Add additional groups to run as

       -h, --hostname=""
          Container host name

       Sets the container host name that is available inside the container.

          Print usage statement

          Run an init inside the container that forwards signals and reaps processes

       -i, --interactive=true|false
          Keep STDIN open even if not attached. The default is false.

       When set to true, keep stdin open even if not attached.

          Sets the container's interface IPv4 address (e.g.,

       It can only be used in conjunction with --network for user-defined networks

          Sets the container's interface IPv6 address (e.g., 2001:db8::1b99)

       It can only be used in conjunction with --network for user-defined networks

          Sets the IPC mode for the container. The following values are accepted:

       │Value                │ Description                                  │
       │(empty)              │ Use daemon's default.                        │
       │none                 │ Own private IPC namespace, with /dev/shm not │
       │                     │ mounted.                                     │
       │private              │ Own private IPC namespace.                   │
       │shareable            │ Own  private IPC namespace, with a possibil‐ │
       │                     │ ity to share it with other containers.       │
       │container:name-or-ID │ Join another ("shareable")  container's  IPC │
       │                     │ namespace.                                   │
       │host                 │ Use the host system's IPC namespace.         │

       If not specified, daemon default is used, which can either be private or shareable, depending on the daemon version and con‐

          Isolation specifies the type of isolation technology used by containers. Note that  the  default  on  Windows  server  is
       process, and the default on Windows client is hyperv. Linux only supports default.

       -l, --label key=value
          Set metadata on the container (for example, --label com.example.key=value).

          Kernel memory limit; S is an optional suffix which can be one of b, k, m, or g.

       Constrains  the  kernel  memory available to a container. If a limit of 0 is specified (not using --kernel-memory), the con‐
       tainer's kernel memory is not limited. If you specify a limit, it may be rounded up to a multiple of the operating  system's
       page size and the value can be very large, millions of trillions.

          Read in a line delimited file of labels

          Add link to another container.

       If  the  operator  uses --link when starting the new client container, then the client container can access the exposed port
       via a private networking interface. Docker will set some environment variables in the  client  container  to  help  indicate
       which interface and port to use.

          Add one or more link-local IPv4/IPv6 addresses to the container's interface

         Logging driver for the container. Default is defined by daemon --log-driver flag.
         Warning: the docker logs command works only for the json-file and
         journald logging drivers.

         Logging driver specific options.

       -m, --memory=number[*S]
          Memory limit; S is an optional suffix which can be one of b, k, m, or g.

       Allows  you  to  constrain the memory available to a container. If the host supports swap memory, then the -m memory setting
       can be larger than physical RAM. If a limit of 0 is specified (not using -m), the container's memory is not limited. The ac‐
       tual  limit  may be rounded up to a multiple of the operating system's page size (the value would be very large, that's mil‐
       lions of trillions).

          Memory soft limit; S is an optional suffix which can be one of b, k, m, or g.

       After setting memory reservation, when the system detects memory contention or low memory, containers are forced to restrict
       their  consumption  to  their  reservation. So you should always set the value below --memory, otherwise the hard limit will
       take precedence. By default, memory reservation will be the same as memory limit.

          Combined memory plus swap limit; S is an optional suffix which can be one of b, k, m, or g.

       This option can only be used together with --memory. The argument should always be larger than that of --memory. Default  is
       double the value of --memory. Set to -1 to enable unlimited swap.

          Container MAC address (e.g., 92:d0:c6:0a:29:33)

       Remember  that  the MAC address in an Ethernet network must be unique.  The IPv6 link-local address will be based on the de‐
       vice's MAC address according to RFC4862.

       --mount type=TYPE,TYPE-SPECIFIC-OPTION[,...]
          Attach a filesystem mount to the container

       Current supported mount TYPES are bind, volume, and tmpfs.





       Common Options:

              • src, source: mount source spec for bind and volume. Mandatory for bind.

              • dst, destination, target: mount destination spec.

              • ro, readonly: true or false (default).

       Note: setting readonly for a bind mount does not make its submounts
          read-only on the current Linux implementation. See also bind-nonrecursive.

       Options specific to bind:

              • bind-propagation: shared, slave, private, rshared, rslave, or rprivate(default). See also mount(2).

              • consistency: consistent(default), cached, or delegated. Currently, only effective for Docker for Mac.

              • bind-nonrecursive: true or false (default). If set to true, submounts are not recursively bind-mounted. This option
                is useful for readonly bind mount.

       Options specific to volume:

              • volume-driver: Name of the volume-driver plugin.

              • volume-label: Custom metadata.

              • volume-nocopy:  true(default) or false. If set to false, the Engine copies existing files and directories under the
                mount-path into the volume, allowing the host to access them.

              • volume-opt: specific to a given volume driver.

       Options specific to tmpfs:

              • tmpfs-size: Size of the tmpfs mount in bytes. Unlimited by default in Linux.

              • tmpfs-mode: File mode of the tmpfs in octal. (e.g. 700 or 0700.) Defaults to 1777 in Linux.

          Assign a name to the container

       The operator can identify a container in three ways:

       │Identifier type       │ Example value                                                      │
       │UUID long identifier  │ "f78375b1c487e03c9438c729345e54db9d20cfa2ac1fc3494b6eb60872e74778" │
       │UUID short identifier │ "f78375b1c487"                                                     │
       │Name                  │ "evil_ptolemy"                                                     │

       The UUID identifiers come from the Docker daemon, and if a name is not assigned to the container with --name then the daemon
       will also generate a random string name. The name is useful when defining links (see --link) (or any other place you need to
       identify a container). This works for both background and foreground Docker containers.

          Set the Network mode for the container. Supported values are:

       │Value                   │ Description                                  │
       │none                    │ No networking in the container.              │
       │bridge                  │ Connect  the container to the default Docker │
       │                        │ bridge via veth interfaces.                  │
       │host                    │ Use the host's network stack inside the con‐ │
       │                        │ tainer.                                      │
       │container:name|id       │ Use  the network stack of another container, │
       │                        │ specified via its name or id.                │
       │network-name|network-id │ Connects the container  to  a  user  created │
       │                        │ network  (using  docker  network create com‐ │
       │                        │ mand)                                        │

       Default is bridge.

          Add network-scoped alias for the container

          Whether to disable OOM Killer for the container or not.

          Tune the host's OOM preferences for containers (accepts -1000 to 1000)

       -P, --publish-all=true|false
          Publish all exposed ports to random ports on the host interfaces. The default is false.

       When set to true publish all exposed ports to the host interfaces. The default is false. If the operator  uses  -P  (or  -p)
       then  Docker  will make the exposed port accessible on the host and the ports will be available to any client that can reach
       the host. When using -P, Docker will bind any exposed port to a random port on the host within an ephemeral port  range  de‐
       fined  by  /proc/sys/net/ipv4/ip_local_port_range.  To  find  the  mapping between the host ports and the exposed ports, use
       docker port(1).

       -p, --publish ip:[hostPort]:containerPort | [hostPort:]containerPort
          Publish a container's port, or range of ports, to the host.

       Both hostPort and containerPort can be specified as a range.  When specifying ranges for both, the number of ports in ranges
       should be equal.

       Examples: -p 1234-1236:1222-1224, -p$HOSTPORT:$CONTAINERPORT.

       Use docker port(1) to see the actual mapping, e.g. docker port CONTAINER $CONTAINERPORT.

          Set the PID mode for the container
          Default is to create a private PID namespace for the container
                                      'container:': join another container's PID namespace
                                      'host':  use  the  host's PID namespace for the container. Note: the host mode gives the con‐
       tainer full access to local PID and is therefore considered insecure.

          Set the usernamespace mode for the container when userns-remap option is enabled.
            host: use the host usernamespace and enable all privileged options (e.g., pid=host or --privileged).

          Tune the container's pids (process IDs) limit. Set to -1 to have unlimited pids for the container.

          Set the UTS mode for the container. The only possible type is host, meaning to use the host's UTS  namespace  inside  the
            Note: the host mode gives the container access to changing the host's hostname and is therefore considered insecure.

       --privileged [true|false]
          Give extended privileges to this container. A "privileged" container is given access to all devices.

       When the operator executes docker run --privileged, Docker will enable access to all devices on the host as well as set some
       configuration in AppArmor to allow the container nearly all the same access to the host as processes running  outside  of  a
       container on the host.

          Mount the container's root filesystem as read only.

       By default a container will have its root filesystem writable allowing processes to write files anywhere.  By specifying the
       --read-only flag the container will have its root filesystem mounted as read only prohibiting any writes.

       --restart policy
          Restart policy to apply when a container exits. Supported values are:

       │Policy                   │ Result                                       │
       │no                       │ Do not automatically restart  the  container │
       │                         │ when it exits.                               │
       │on-failure[:max-retries] │ Restart  only  if the container exits with a │
       │                         │ non-zero exit status. Optionally, limit  the │
       │                         │ number  of restart retries the Docker daemon │
       │                         │ attempts.                                    │
       │always                   │ Always restart the container  regardless  of │
       │                         │ the  exit  status.  When you specify always, │
       │                         │ the Docker daemon will try  to  restart  the │
       │                         │ container  indefinitely.  The container will │
       │                         │ also always start on daemon startup, regard‐ │
       │                         │ less of the current state of the container.  │
       │unless-stopped           │ Always  restart  the container regardless of │
       │                         │ the exit status, but do not start it on dae‐ │
       │                         │ mon startup if the container has been put to │
       │                         │ a stopped state before.                      │

       Default is no.

       --rm true|false
          Automatically remove the container when it exits. The default is false.
          --rm flag can work together with -d, and auto-removal will be done on daemon side. Note that it's incompatible  with  any
       restart policy other than none.

       --security-opt value[,...]
          Security Options for the container. The following options can be given:

              "label=user:USER"   : Set the label user for the container
              "label=role:ROLE"   : Set the label role for the container
              "label=type:TYPE"   : Set the label type for the container
              "label=level:LEVEL" : Set the label level for the container
              "label=disable"     : Turn off label confinement for the container
              "no-new-privileges" : Disable container processes from gaining additional privileges

              "seccomp=unconfined" : Turn off seccomp confinement for the container
              "seccomp=profile.json :  White listed syscalls seccomp Json file to be used as a seccomp filter

              "apparmor=unconfined" : Turn off apparmor confinement for the container
              "apparmor=your-profile" : Set the apparmor confinement profile for the container

          Storage driver options per container

       $ docker run -it --storage-opt size=120G fedora /bin/bash

       This (size) will allow to set the container rootfs size to 120G at creation time.
          This option is only available for the devicemapper, btrfs, overlay2  and zfs graph drivers.
          For the devicemapper, btrfs and zfs storage drivers, user cannot pass a size less than the Default BaseFS Size.
          For  the  overlay2 storage driver, the size option is only available if the backing fs is xfs and mounted with the pquota
       mount option.
          Under these conditions, user can pass any size less than the backing fs size.

          Signal to stop the container.

       The --stop-signal flag sets the system call signal that will be sent to the
          container to exit. This signal can be a signal name in the format SIG<NAME>,
          for instance SIGKILL, or an unsigned number that matches a position in the
          kernel's syscall table, for instance 9.

       The default is defined by STOPSIGNAL in the image, or SIGTERM if the image
          has no STOPSIGNAL defined.

         Timeout (in seconds) to stop a container, or -1 to disable timeout.

       The --stop-timeout flag sets the number of seconds to wait for the container
         to stop after sending the pre-defined (see --stop-signal) system call signal.
         If the container does not exit after the timeout elapses, it is forcibly killed
         with a SIGKILL signal.

       If --stop-timeout is set to -1, no timeout is applied, and the daemon will
         wait indefinitely for the container to exit.

       The default is determined by the daemon, and 10 seconds for Linux containers,
         and 30 seconds for Windows containers.

          Size of /dev/shm. The format is <number><unit>.
          number must be greater than 0.  Unit is optional and can be b (bytes), k (kilobytes), m(megabytes), or g (gigabytes).
          If you omit the unit, the system uses bytes. If you omit the size entirely, the system uses 64m.

         Configure namespaced kernel parameters at runtime

       IPC Namespace - current sysctls allowed:

       kernel.msgmax, kernel.msgmnb, kernel.msgmni, kernel.sem, kernel.shmall, kernel.shmmax, kernel.shmmni, kernel.shm_rmid_forced
         Sysctls beginning with fs.mqueue.*

       If you use the --ipc=host option these sysctls will not be allowed.

       Network Namespace - current sysctls allowed:
             Sysctls beginning with net.*

       If you use the --network=host option these sysctls will not be allowed.

          Proxy received signals to the process (non-TTY mode only). SIGCHLD, SIGSTOP, and SIGKILL are not proxied. The default  is

          Tune a container's memory swappiness behavior. Accepts an integer between 0 and 100.

       -t, --tty=true|false
          Allocate a pseudo-TTY. The default is false.

       When  set  to true Docker can allocate a pseudo-tty and attach to the standard input of any container. This can be used, for
       example, to run a throwaway interactive shell. The default is false.

       The -t option is incompatible with a redirection of the docker client standard input.

       --tmpfs=[] Create a tmpfs mount

       Mount a temporary filesystem (tmpfs) mount into a container, for example:

       $ docker run -d --tmpfs /tmp:rw,size=787448k,mode=1777 my_image

       This command mounts a tmpfs at /tmp within the container.  The supported mount options are the same  as  the  Linux  default
       mount flags. If you do not specify any options, the systems uses the following options: rw,noexec,nosuid,nodev,size=65536k.

       See also --mount, which is the successor of --tmpfs and --volume.
          Even though there is no plan to deprecate --tmpfs, usage of --mount is recommended.

       -u, --user=""
          Sets the username or UID used and optionally the groupname or GID for the specified command.

       The followings examples are all valid:
          --user [user | user:group | uid | uid:gid | user:gid | uid:group ]

       Without this argument the command will be run as root in the container.

           Ulimit options

          Create a bind mount. If you specify, -v /HOST-DIR:/CONTAINER-DIR, Docker
          bind mounts /HOST-DIR in the host to /CONTAINER-DIR in the Docker
          container. If 'HOST-DIR' is omitted,  Docker automatically creates the new
          volume on the host.  The OPTIONS are a comma delimited list and can be:

              • [rw|ro]

              • [z|Z]

              • [[r]shared|[r]slave|[r]private]

              • [delegated|cached|consistent]

              • [nocopy]

       The  CONTAINER-DIR  must be an absolute path such as /src/docs. The HOST-DIR can be an absolute path or a name value. A name
       value must start with an alphanumeric character, followed by a-z0-9, _ (underscore), . (period) or - (hyphen).  An  absolute
       path starts with a / (forward slash).

       If you supply a HOST-DIR that is an absolute path,  Docker bind-mounts to the path you specify. If you supply a name, Docker
       creates a named volume by that name. For example, you can specify either /foo or foo for a HOST-DIR value. If you supply the
       /foo value, Docker creates a bind mount. If you supply the foo specification, Docker creates a named volume.

       You  can specify multiple  -v options to mount one or more mounts to a container. To use these same mounts in other contain‐
       ers, specify the --volumes-from option also.

       You can supply additional options for each bind mount following an additional colon.  A :ro or :rw suffix mounts a volume in
       read-only  or  read-write  mode, respectively. By default, volumes are mounted in read-write mode.  You can also specify the
       consistency requirement for the mount, either :consistent (the default), :cached, or :delegated.  Multiple options are sepa‐
       rated by commas, e.g. :ro,cached.

       Labeling  systems  like  SELinux require that proper labels are placed on volume content mounted into a container. Without a
       label, the security system might prevent the processes running inside the container from  using  the  content.  By  default,
       Docker does not change the labels set by the OS.

       To  change a label in the container context, you can add either of two suffixes :z or :Z to the volume mount. These suffixes
       tell Docker to relabel file objects on the shared volumes. The z option tells Docker that two containers  share  the  volume
       content.  As  a  result, Docker labels the content with a shared content label. Shared volume labels allow all containers to
       read/write content.  The Z option tells Docker to label the content with a private unshared label.  Only  the  current  con‐
       tainer can use a private volume.

       By  default  bind  mounted  volumes are private. That means any mounts done inside container will not be visible on host and
       vice-a-versa. One can change this behavior by specifying a volume mount propagation property. Making a volume shared  mounts
       done under that volume inside container will be visible on host and vice-a-versa. Making a volume slave enables only one way
       mount propagation and that is mounts done on host under that volume will be visible inside container but not the  other  way

       To  control mount propagation property of volume one can use :[r]shared, :[r]slave or :[r]private propagation flag. Propaga‐
       tion property can be specified only for bind mounted volumes and not for internal volumes or named volumes. For mount propa‐
       gation to work source mount point (mount point where source dir is mounted on) has to have right propagation properties. For
       shared volumes, source mount point has to be shared. And for slave volumes, source mount has to be either shared or slave.

       Use df <source-dir> to figure out the source mount and then use findmnt -o TARGET,PROPAGATION <source-mount-dir>  to  figure
       out propagation properties of source mount. If findmnt utility is not available, then one can look at mount entry for source
       mount point in /proc/self/mountinfo. Look at optional fields and see if any propagation properties are specified.   shared:X
       means mount is shared, master:X means mount is slave and if nothing is there that means mount is private.

       To  change  propagation properties of a mount point use mount command. For example, if one wants to bind mount source direc‐
       tory /foo one can do mount --bind /foo /foo and mount --make-private --make-shared /foo.  This  will  convert  /foo  into  a
       shared  mount point. Alternatively one can directly change propagation properties of source mount. Say / is source mount for
       /foo, then use mount --make-shared / to convert / into a shared mount.

              Note: When using systemd to manage the Docker daemon's start and stop, in the systemd unit file there is an option to
              control mount propagation for the Docker daemon itself, called MountFlags. The value of this setting may cause Docker
              to not see mount propagation changes made on the mount point. For example, if this value is slave,  you  may  not  be
              able to use the shared or rshared propagation on a volume.

       To  disable automatic copying of data from the container path to the volume, use the nocopy flag. The nocopy flag can be set
       on bind mounts and named volumes.

       See also --mount, which is the successor of --tmpfs and --volume.  Even though there is no plan to deprecate --volume, usage
       of --mount is recommended.

          Container's volume driver. This driver creates volumes specified either from
          a Dockerfile's VOLUME instruction or from the docker run -v flag.
          See docker-volume-create(1) for full details.

          Mount volumes from the specified container(s)

       Mounts already mounted volumes from a source container onto another
          container. You must supply the source's container-id. To share
          a volume, use the --volumes-from option when running
          the target container. You can share volumes even if the source container
          is not running.

       By default, Docker mounts the volumes in the same mode (read-write or
          read-only) as it is mounted in the source container. Optionally, you
          can change this by suffixing the container-id with either the :ro or
          :rw keyword.

       If the location of the volume from the source container overlaps with
          data residing on a target container, then the volume hides
          that data on the target.

       -w, --workdir=""
          Working directory inside the container

       The  default  working  directory  for running binaries within a container is the root directory (/). The developer can set a
       different default with the Dockerfile WORKDIR instruction. The operator can override the working directory by using  the  -w

Exit Status
       The exit code from docker run gives information about why the container failed to run or why it exited.  When docker run ex‐
       its with a non-zero code, the exit codes follow the chroot standard, see below:

       125 if the error is with Docker daemon itself

              $ docker run --foo busybox; echo $?
              # flag provided but not defined: --foo
                See 'docker run --help'.

       126 if the contained command cannot be invoked

              $ docker run busybox /etc; echo $?
              # exec: "/etc": permission denied
                docker: Error response from daemon: Contained command could not be invoked

       127 if the contained command cannot be found

              $ docker run busybox foo; echo $?
              # exec: "foo": executable file not found in $PATH
                docker: Error response from daemon: Contained command not found or does not exist

       Exit code of contained command otherwise

              $ docker run busybox /bin/sh -c 'exit 3'
              # 3

Running container in read-only mode
       During container image development, containers often need to write to the image content.  Installing packages into /usr, for
       example.   In  production,  applications seldom need to write to the image.  Container applications write to volumes if they
       need to write to file systems at all.  Applications can be made more secure by running them  in  read-only  mode  using  the
       --read-only switch.  This protects the containers image from modification. Read only containers may still need to write tem‐
       porary data.  The best way to handle this is to mount tmpfs directories on /run and /tmp.

              # docker run --read-only --tmpfs /run --tmpfs /tmp -i -t fedora /bin/bash

Exposing log messages from the container to the host's log
       If you want messages that are logged in your container to show up in the host's syslog/journal then you  should  bind  mount
       the /dev/log directory as follows.

              # docker run -v /dev/log:/dev/log -i -t fedora /bin/bash

       From inside the container you can test this by sending a message to the log.

              (bash)# logger "Hello from my container"

       Then exit and check the journal.

              # exit

              # journalctl -b | grep Hello

       This should list the message sent to logger.

Attaching to one or more from STDIN, STDOUT, STDERR
       If you do not specify -a then Docker will attach everything (stdin,stdout,stderr) you'd like to connect instead, as in:

              # docker run -a stdin -a stdout -i -t fedora /bin/bash

Sharing IPC between containers
       Using shm_server.c available here:

       Testing --ipc=host mode:

       Host shows a shared memory segment with 7 pids attached, happens to be from httpd:

               $ sudo ipcs -m

               ------ Shared Memory Segments --------
               key        shmid      owner      perms      bytes      nattch     status
               0x01128e25 0          root       600        1000       7

       Now run a regular container, and it correctly does NOT see the shared memory segment from the host:

               $ docker run -it shm ipcs -m

               ------ Shared Memory Segments --------
               key        shmid      owner      perms      bytes      nattch     status

       Run a container with the new --ipc=host option, and it now sees the shared memory segment from the host httpd:

               $ docker run -it --ipc=host shm ipcs -m

               ------ Shared Memory Segments --------
               key        shmid      owner      perms      bytes      nattch     status
               0x01128e25 0          root       600        1000       7

       Testing --ipc=container:CONTAINERID mode:

       Start a container with a program to create a shared memory segment:

               $ docker run -it shm bash
               $ sudo shm/shm_server &
               $ sudo ipcs -m

               ------ Shared Memory Segments --------
               key        shmid      owner      perms      bytes      nattch     status
               0x0000162e 0          root       666        27         1

       Create a 2nd container correctly shows no shared memory segment from 1st container:

               $ docker run shm ipcs -m

               ------ Shared Memory Segments --------
               key        shmid      owner      perms      bytes      nattch     status

       Create  a  3rd  container  using the new --ipc=container:CONTAINERID option, now it shows the shared memory segment from the

               $ docker run -it --ipc=container:ed735b2264ac shm ipcs -m
               $ sudo ipcs -m

               ------ Shared Memory Segments --------
               key        shmid      owner      perms      bytes      nattch     status
               0x0000162e 0          root       666        27         1

Linking Containers
              Note: This section describes linking between containers on the  default  (bridge)  network,  also  known  as  "legacy
              links". Using --link on user-defined networks uses the DNS-based discovery, which does not add entries to /etc/hosts,
              and does not set environment variables for discovery.

       The link feature allows multiple containers to communicate with each other. For example, a container  whose  Dockerfile  has
       exposed port 80 can be run and named as follows:

              # docker run --name=link-test -d -i -t fedora/httpd

       A  second  container, in this case called linker, can communicate with the httpd container, named link-test, by running with
       the --link=:

              # docker run -t -i --link=link-test:lt --name=linker fedora /bin/bash

       Now the container linker is linked to container link-test with the alias lt.  Running the env command  in  the  linker  con‐
       tainer shows environment variables
        with the LT (alias) context (LT_)

              # env

       When  linking  two containers Docker will use the exposed ports of the container to create a secure tunnel for the parent to

       If a container is connected to the default bridge network and linked with other containers, then the container's  /etc/hosts
       file is updated with the linked container's name.

              Note  Since Docker may live update the container's /etc/hosts file, there may be situations when processes inside the
              container can end up reading an empty or incomplete /etc/hosts file. In most cases, retrying the  read  again  should
              fix the problem.

Mapping Ports for External Usage
       The  exposed  port  of  an  application can be mapped to a host port using the -p flag. For example, an httpd port 80 can be
       mapped to the host port 8080 using the following:

              # docker run -p 8080:80 -d -i -t fedora/httpd

Creating and Mounting a Data Volume Container
       Many applications require the sharing of persistent data across several containers. Docker allows you to create a Data  Vol‐
       ume  Container  that  other  containers  can  mount  from.  For  example, create a named container that contains directories
       /var/volume1 and /tmp/volume2. The image will need to contain these directories so a couple of RUN mkdir instructions  might
       be required for you fedora-data image:

              # docker run --name=data -v /var/volume1 -v /tmp/volume2 -i -t fedora-data true
              # docker run --volumes-from=data --name=fedora-container1 -i -t fedora bash

       Multiple  --volumes-from parameters will bring together multiple data volumes from multiple containers. And it's possible to
       mount the volumes that came from the DATA container in yet another container via  the  fedora-container1  intermediary  con‐
       tainer, allowing to abstract the actual data source from users of that data:

              # docker run --volumes-from=fedora-container1 --name=fedora-container2 -i -t fedora bash

Mounting External Volumes
       To  mount  a  host directory as a container volume, specify the absolute path to the directory and the absolute path for the
       container directory separated by a colon:

              # docker run -v /var/db:/data1 -i -t fedora bash

       When using SELinux, be aware that the host has no knowledge of container SELinux policy. Therefore, in the above example, if
       SELinux policy is enforced, the /var/db directory is not writable to the container. A "Permission Denied" message will occur
       and an avc: message in the host's syslog.

       To work around this, at time of writing this man page, the following command needs to be run in order for the proper SELinux
       policy type label to be attached to the host directory:

              # chcon -Rt svirt_sandbox_file_t /var/db

       Now,  writing  to  the  /data1 volume in the container will be allowed and the changes will also be reflected on the host in

Using alternative security labeling
       You can override the default labeling scheme for each container by specifying the --security-opt flag. For example, you  can
       specify  the MCS/MLS level, a requirement for MLS systems. Specifying the level in the following command allows you to share
       the same content between containers.

              # docker run --security-opt label=level:s0:c100,c200 -i -t fedora bash

       An MLS example might be:

              # docker run --security-opt label=level:TopSecret -i -t rhel7 bash

       To disable the security labeling for this container versus running with the --permissive flag, use the following command:

              # docker run --security-opt label=disable -i -t fedora bash

       If you want a tighter security policy on the processes within a container, you can specify an alternate type  for  the  con‐
       tainer. You could run a container that is only allowed to listen on Apache ports by executing the following command:

              # docker run --security-opt label=type:svirt_apache_t -i -t centos bash


       You would have to write policy defining a svirt_apache_t type.

Setting device weight
       If  you  want to set /dev/sda device weight to 200, you can specify the device weight by --blkio-weight-device flag. Use the
       following command:

              # docker run -it --blkio-weight-device "/dev/sda:200" ubuntu

Specify isolation technology for container (--isolation)
       This option is useful in situations where you are running Docker containers on Microsoft Windows.  The  --isolation  <value>
       option  sets  a  container's isolation technology. On Linux, the only supported is the default option which uses Linux name‐
       spaces. These two commands are equivalent on Linux:

              $ docker run -d busybox top
              $ docker run -d --isolation default busybox top

       On Microsoft Windows, can take any of these values:

              • default: Use the value specified by the Docker daemon's --exec-opt . If the daemon does not  specify  an  isolation
                technology, Microsoft Windows uses process as its default value.

              • process: Namespace isolation only.

              • hyperv: Hyper-V hypervisor partition-based isolation.

       In practice, when running on Microsoft Windows without a daemon option set,  these two commands are equivalent:

              $ docker run -d --isolation default busybox top
              $ docker run -d --isolation process busybox top

       If  you  have  set  the --exec-opt isolation=hyperv option on the Docker daemon, any of these commands also result in hyperv

              $ docker run -d --isolation default busybox top
              $ docker run -d --isolation hyperv busybox top

Setting Namespaced Kernel Parameters (Sysctls)
       The --sysctl sets namespaced kernel parameters (sysctls) in the container. For example, to turn on IP forwarding in the con‐
       tainers network namespace, run this command:

              $ docker run --sysctl net.ipv4.ip_forward=1 someimage


       Not  all  sysctls  are  namespaced. Docker does not support changing sysctls inside of a container that also modify the host
       system. As the kernel evolves we expect to see more sysctls become namespaced.

       See the definition of the --sysctl option above for the current list of supported sysctls.

       April 2014, Originally compiled by William Henry (whenry at redhat dot com) based on source material and internal
       work.   June 2014, updated by Sven Dowideit ⟨⟩ July 2014, updated by
       Sven Dowideit ⟨⟩ November 2015, updated  by  Sally  O'Malley  somal‐ ⟨⟩

Docker Community                                             JUNE 2014                                                    DOCKER(1)