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Josh Reuben

IMHO, docker lightweight virtualization is an incredible game-changer. It totally sweeps the “DevOps” board and along with etcd and Kubernetes pods, supports complex application chain orchestrations through mapped ports. In this short post, I have summarized my investigations into the Docker CLI.

Image Management

  • build <dockerfile> - create an image according to a dockerfile instructions
  • commit <container> - create an image from a container
  • create - create a new container from an image
  • images - list locally downloaded images: repository name and tag, id, creation date, size
  • login/logout - connect to docker hub
  • pull/push <image> - download / upload an image from a repository
  • rmi <image> - remove a local image
  • search - look for an image in repository
  • tag - add a tag to an image
  • import / export - serialize / deserialize image to/from tar
  • save / load - serialize / deserialize image of a running container to/from tar
  • history - show history of an image
  • build - build an image from filesystem
  • diff - examine differences between images
  • rmi - remove an image

Container Control

  • attach <container> - attach to a running container
  • cap-add/drop - fine grain control of privelleges whitelist
  • run <image> [command] - download an image and execute it, with an optional linux command
    • -t - assign a pseudo-tty or terminal inside the container
    • -i - interactive connection by grabbing container STDIN
    • -d - run container as a daemon
    • -P - map any required ports
    • -p <in:out> - map a specific port number pair
    • --name - give a container instance a name
    • --link - establish a secure tunnel to another named container, optionally specify an alias
    • --rm - remove
    • -v - add a volume to a container. postfix with :ro to make it read only
    • -volumes-from - share data in container chain
    • -H - run on an external socket instead of unix:///var/run/docker.sock
    • --ip-forward - enable ip forwarding
    • --iptables - enable firewall tables

eg

sudo docker run -t -i ubuntu:14.10 /bin/bash

sudo docker run --name <image2> --link db:db <image1> env

  • exec <container> <command> - run a command on a container
  • kill <container>
  • restart <container> - restart. specify container restart policy: no / on-failure / always
  • rm <container> - remove a stopped container.
    • -f - stop before removing
  • start / pause / unpause / stop <container> - start / gracefully stop a container
  • wait - block until a container stops

Container Queries

  • inspect <container> - JSON query of container config & runtime info
  • logs <container> - capture STDOUT from a container
    • -f - tail it to watch it
  • port <container> <outport> - query corresponding mapped inport
  • ps - query docker daemon for running container instances
    • -l - lists container Id, image, command, creation date, status, ports, names
    • -a - stopped containers only
  • top <container> - see what processes are running on a container
  • events - listen to events from a container
  • cp - copy files between container and host

Other

  • info - check your install
  • version - version info
Posted on Monday, March 9, 2015 10:18 AM Linux | Back to top


Comments on this post: The Docker Container Command Line Interface

# re: The Docker Container Command Line Interface
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The potential uses of this idea cannot be questioned. - Dr. Thomas Devlin
Left by George Walter on Dec 17, 2016 7:06 PM

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