Docker basic foundation | Wenhan Code life

Docker basic foundation

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:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
# 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.

1
2
3
4
5
6
7
8
# 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.

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
# 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)[https://docs.docker.com/engine/reference/commandline/docker/].

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.

1
2
3
4
5
6
7
8
9
10
11
12
# 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.