Base on CentOS 7, Docker 1.12.6

Install Docker

Some pre-requirment to install Docker to a Linux OS.

  • Docker only can be installed on a 64 bit OS.
  • Kernel version over 3.10 is recommended. recommend
  • Need to enable cgroup and namespace.

Now it is easier to install Docker in CentOS or Fedora, it can be searched by yum command like below:

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$ yum search docker | grep ^docker
docker-client.x86_64 : Client side files for Docker
docker-client-latest.x86_64 : Client side files for Docker
docker-common.x86_64 : Common files for docker and docker-latest
docker-compose.noarch : Multi-container orchestration for Docker
docker-distribution.x86_64 : Docker toolset to pack, ship, store, and deliver
docker-latest-logrotate.x86_64 : cron job to run logrotate on Docker containers
docker-latest-v1.10-migrator.x86_64 : Calculates SHA256 checksums for docker
docker-logrotate.x86_64 : cron job to run logrotate on Docker containers
docker-lvm-plugin.x86_64 : Docker volume driver for lvm volumes
docker-python.x86_64 : An API client for docker written in Python
docker-registry.x86_64 : Registry server for Docker
docker-v1.10-migrator.x86_64 : Calculates SHA256 checksums for docker layer
docker.x86_64 : Automates deployment of containerized applications
docker-devel.x86_64 : A golang registry for global request variables (source
docker-forward-journald.x86_64 : Forward stdin to journald
docker-latest.x86_64 : Automates deployment of containerized applications
docker-novolume-plugin.x86_64 : Block container starts with local volumes
docker-unit-test.x86_64 : Automates deployment of containerized applications -

Running yum -y install docker to install docker to your system.

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$ yum -y install docker

...snip...

Installed:
  docker.x86_64 2:1.12.6-71.git3e8e77d.el7.centos.1                                                                                                                      

Complete!

After the installation, start docker service and run docker version to confirm your setup.

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$ systemctl start docker

$ docker version
Client:
 Version:         1.12.6
 API version:     1.24
 Package version: docker-1.12.6-71.git3e8e77d.el7.centos.1.x86_64
 Go version:      go1.8.3
 Git commit:      3e8e77d/1.12.6
 Built:           Tue Jan 30 09:17:00 2018
 OS/Arch:         linux/amd64

Server:
 Version:         1.12.6
 API version:     1.24
 Package version: docker-1.12.6-71.git3e8e77d.el7.centos.1.x86_64
 Go version:      go1.8.3
 Git commit:      3e8e77d/1.12.6
 Built:           Tue Jan 30 09:17:00 2018
 OS/Arch:         linux/amd64

Basic docker command

Here will introduce some basic command to use docker, for more detail please refer Docker Documentation.

Docker command will help you to communicate with docker daemon. The docker daemon will listen and execute docker command. run docker or docker --help to get the command list.

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$ docker --help
...
Commands:
    attach    Attach to a running container
    build     Build an image from a Dockerfile
    commit    Create a new image from a container's changes
    ...
    version   Show the Docker version information
    volume    Manage Docker volumes
    wait      Block until a container stops, then print its exit code

Run 'docker COMMAND --help' for more information on a command.

Running docker command needs root permission.