1-確認系統資訊

# cat /etc/redhat-release 
CentOS Linux release 7.4.1708 (Core)
# uname -a
Linux docker 3.10.0-693.el7.x86_64 #1 SMP Tue Aug 22 21:09:27 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

2-安裝docker

[[email protected] ~]$ yum list docker-ce --showduplicates | sort -r
[[email protected] ~]$ sudo yum install 17.09.0.ce-1.el7.centos
[sudo] password for shu: 
shu is not in the sudoers file.  This incident will be reported.
解決： [

[email protected] ~]# chmod u+w /etc/sudoers
[[email protected] ~]# vi /etc/sudoers 
最後增加：%sudo ALL=(ALL) NOPASSWD: ALL  #允許使用者組sudo裡面的使用者執行sudo命令,並且在執行的時候不輸入密碼.
[[email protected] ~]# chmod u-w /etc/sudoers
[[email protected] ~]# 
[[email protected] ~]# groupadd sudo
[[email protected] ~]# usermod -aG sudo,adm shu

# yum -y install docker

[[email protected] yum.repos.d]$ yum list docker-ce --showduplicates | sort -r
 * updates: ftp.sjtu.edu.cn
Loading mirror speeds from cached hostfile
Loaded plugins: fastestmirror, langpacks
 * extras: ftp.sjtu.edu.cn
docker-ce.x86_64            17.09.1.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.09.0.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.06.2.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.06.1.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.06.0.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.03.2.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.03.1.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.03.0.ce-1.el7.centos             docker-ce-stable
 * base: ftp.sjtu.edu.cn
Available Packages
[

[email protected] yum.repos.d]$ sudo yum install docker-ce-17.09.0.ce-1.el7.centos

安裝指定版本

3-關閉SELinux和啟動docker服務

關閉SELinux

• 永久方法：修改/etc/selinux/config檔案中設定SELINUX=disabled ，然後重啟。

• 臨時方法：執行setenforce 0命令設定SELinux成為permissive模式

  sudo systemctl status firewalld.service
  sudo systemctl stop firewalld.service          
  sudo systemctl disable firewalld.service

啟動docker服務
[[email protected] ~]# systemctl start docker.service

設定自啟動docker服務

[[email protected] ~]# systemctl enable docker.service
Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service.
[[email protected] ~]# systemctl is-enabled docker.service
enabled
[[email protected] ~]# 

4-設定docker代理（若需要）

5-重啟docker

# systemctl daemon-reload
# systemctl restart docker

6-安裝驗證

執行官方映象hello-world檔案

# docker run hello-world
Unable to find image 'hello-world:latest' locally
Trying to pull repository docker.io/library/hello-world ... 
latest: Pulling from docker.io/library/hello-world
c04b14da8d14: Pull complete 
Digest: sha256:0256e8a36e2070f7bf2d0b0763dbabdd67798512411de4cdcf9431a1feb60fd9
Status: Downloaded newer image for docker.io/hello-world:latest

Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
 1. The Docker client contacted the Docker daemon.
 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
 3. The Docker daemon created a new container from that image which runs the
    executable that produces the output you are currently reading.
 4. The Docker daemon streamed that output to the Docker client, which sent it
    to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
 $ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker Hub account:
 https://hub.docker.com

For more examples and ideas, visit:
 https://docs.docker.com/engine/userguide/

# 
# docker images
REPOSITORY              TAG                 IMAGE ID            CREATED             SIZE
docker.io/hello-world   latest              c54a2cc56cbb        5 months ago        1.848 kB

另外一種Docker代理設定方法（若需要）：

修改docker.service檔案
# vim /usr/lib/systemd/system/docker.service
在[Service]部分新增如下內容
Environment="HTTP_PROXY=http://10.144.1.10:8080"
Environment="HTTPS_PROXY=https://10.144.1.10:8080"
Environment="FTP_PROXY=ftp://10.144.1.10:8080"

或者，另外建立代理檔案

# mkdir /etc/systemd/system/docker.service.d
# touch /etc/systemd/system/docker.service.d/proxy.conf
# vim /etc/systemd/system/docker.service.d/proxy.conf

重啟docker
# systemctl daemon-reload
# systemctl restart docker

檢查docker環境變數是否載入

# systemctl show docker --property Environment
Environment=GOTRACEBACK=crash HTTP_PROXY=http://10.144.1.10:8080 HTTPS_PROXY=https://10.144.1.10:8080 FTP_PROXY=ftp://10.144.1.10:8080

Log - Install Docker in CentOS-7

[[email protected] ~]# route add default gw 10.0.3.2
[[email protected] ~]# 
[[email protected] ~]# yum -y install docker

[[email protected] ~]# vim /etc/selinux/config
[[email protected] ~]#  cat /etc/selinux/config |grep"SELINUX="
# SELINUX= can take one of these three values:
SELINUX=disabled
[[email protected] ~]# 
[[email protected] ~]# setenforce 0
[[email protected] ~]# 
[[email protected] ~]# systemctl start docker.service
[[email protected] ~]# systemctl enable docker.service
Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service.
[[email protected] ~]# systemctl is-enabled docker.service
enabled
[[email protected] ~]# 
[[email protected] ~]# sudo mkdir -p /etc/docker
[[email protected] ~]# sudo tee /etc/docker/daemon.json <<-'EOF'
> {
>   "registry-mirrors": ["https://t5t8q6wn.mirror.aliyuncs.com"]
> }
> EOF
{
  "registry-mirrors": ["https://t5t8q6wn.mirror.aliyuncs.com"]
}
[[email protected] ~]# systemctl daemon-reload
[[email protected] ~]# systemctl restart docker
[[email protected] ~]# 
[[email protected] ~]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
[[email protected] ~]# 
[[email protected] ~]# docker run hello-world
Unable to find image 'hello-world:latest' locally
Trying to pull repository docker.io/library/hello-world ... 
latest: Pulling from docker.io/library/hello-world
78445dd45222: Pull complete 
Digest: sha256:c5515758d4c5e1e838e9cd307f6c6a0d620b5e07e6f927b07d05f6d12a1ac8d7

Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
 1. The Docker client contacted the Docker daemon.
 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
 3. The Docker daemon created a new container from that image which runs the
    executable that produces the output you are currently reading.
 4. The Docker daemon streamed that output to the Docker client, which sent it
    to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
 $ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker ID:
 https://cloud.docker.com/

For more examples and ideas, visit:
 https://docs.docker.com/engine/userguide/

[[email protected] ~]# 
[[email protected] ~]# docker images
REPOSITORY              TAG                 IMAGE ID            CREATED             SIZE
docker.io/hello-world   latest              48b5124b2768        3 months ago        1.84 kB
[[email protected] ~]#