CentOS 6 install Docker

Install EPEL

Two ways

Direct installation:

yum install epel-release

You can also replace 清华源

Install via link:

yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-6.noarch.rpm

See Official Instructions

Update dependent software###

sudo yum update -y

Install Docker

Add user group

Add a docker group

groupadd docker

Add users who use docker to the group

useradd docker -g docker

Add current users to the group

sudo usermod -aG docker $USER

Install Docker

For systems above CentOS7, you can use curl -sSL https://get.docker.com/ | sh to directly point to the installation script, here is to install with yum.

sudo yum -y install docker-io

Execute docker version to check whether the installation is successful:

Client version:1.7.1
Client API version:1.19
Go version(client): go1.4.2
Git commit(client): 786b29d/1.7.1
OS/Arch(client): linux/amd64
Get http:///var/run/docker.sock/v1.19/version: dial unix /var/run/docker.sock: no such file or directory. Are you trying to connect to a TLS-enabled daemon without TLS?

Docker Server has not been started yet, so there is a prompt at the end.

Mirror acceleration##

At present, there are several mature image acceleration in China. Here is an example of DockerCn:

CentOS6 achieves image acceleration by editing the other_args parameter of the /etc/sysconfig/docker file.

# /etc/sysconfig/docker
#
# Other arguments to pass to the docker daemon process
# These will be parsed by the sysv initscript and appended
# to the arguments list passed to docker -d

other_args="--registry-mirror=https://registry.docker-cn.com"
DOCKER_CERT_PATH=/etc/docker

# Resolves: rhbz#1176302(docker issue #407)
DOCKER_NOWARN_KERNEL_VERSION=1

# Location used for temporary files, such as those created by
# # docker load and build operations. Default is /var/lib/docker/tmp
# # Can be overriden by setting the following environment variable.
# # DOCKER_TMPDIR=/var/tmp

This example only applies to CentOS6, if the service has already been started, the service service docker restart needs to be restarted.

Docker China official image acceleration

Start service##

Start the Docker service

service docker start

Attached to stop and restart the service

service docker stop
service docker restart

Check the installation##

Execute docker version

Client version:1.7.1
Client API version:1.19
Go version(client): go1.4.2
Git commit(client): 786b29d/1.7.1
OS/Arch(client): linux/amd64
Server version:1.7.1
Server API version:1.19
Go version(server): go1.4.2
# /etc/sysconfig/docker
Git commit(server): 786b29d/1.7.1
OS/Arch(server): linux/amd64

Execute docker info

Containers:0
Images:0
Storage Driver: devicemapper
 Pool Name: docker-202:2-1172437-pool
 Pool Blocksize:65.54 kB
 Backing Filesystem: extfs
 Data file:/dev/loop0
 Metadata file:/dev/loop1
 Data Space Used:305.7 MB
 Data Space Total:107.4 GB
 Data Space Available:34.62 GB
 Metadata Space Used:733.2 kB
 Metadata Space Total:2.147 GB
 Metadata Space Available:2.147 GB
 Udev Sync Supported:true
 Deferred Removal Enabled:false
 Data loop file:/var/lib/docker/devicemapper/devicemapper/data
 Metadata loop file:/var/lib/docker/devicemapper/devicemapper/metadata
 Library Version:1.02.117-RHEL6(2016-12-13)
Execution Driver: native-0.2
Logging Driver: json-file
Kernel Version:2.6.32-358.el6.x86_64
Operating System:<unknown>
CPUs:8
Total Memory:15.55 GiB
Name: ecs-634b-0002
ID: IMEI:V37Q:FO5S:3GYL:X2UH:2ECU:V4RW:---------------------------

At this point, the installation is complete!