一、配置阿里云docker镜像加速器
#配置加速器地址
root@nulige:~# vi /etc/docker/daemon.json
{ 
 "registry-mirrors": ["https://alzgoonw.mirror.aliyuncs.com"] 
 } 
#重启服务
root@nulige:~# systemctl daemon-reload
 root@nulige:~# systemctl restart docker
 root@nulige:~# systemctl status docker
 ● docker.service - Docker Application Container Engine
 Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
 Active: active (running) since 六 2018-07-14 15:57:37 CST; 5s ago
 Docs: https://docs.docker.com
 Main PID: 20924 (dockerd)
 Tasks: 24
 Memory: 17.5M
 CPU: 335ms
 CGroup: /system.slice/docker.service
 ├─20924 /usr/bin/dockerd -H fd://
 └─20931 containerd -l unix:///var/run/docker/libcontainerd/docker-containerd.sock7月 14 15:57:36 nulige dockerd[20924]: time="2018-07-14T15:57:36.563943482+08:00" level=info 
 7月 14 15:57:36 nulige dockerd[20924]: time="2018-07-14T15:57:36.806216247+08:00" level=info 
 7月 14 15:57:36 nulige dockerd[20924]: time="2018-07-14T15:57:36.939167334+08:00" level=info 
 7月 14 15:57:36 nulige dockerd[20924]: time="2018-07-14T15:57:36.942417843+08:00" level=warni
 7月 14 15:57:36 nulige dockerd[20924]: time="2018-07-14T15:57:36.993952096+08:00" level=warni
 7月 14 15:57:36 nulige dockerd[20924]: time="2018-07-14T15:57:36.995672598+08:00" level=warni
 7月 14 15:57:36 nulige dockerd[20924]: time="2018-07-14T15:57:36.996020601+08:00" level=info 
 7月 14 15:57:36 nulige dockerd[20924]: time="2018-07-14T15:57:36.996082156+08:00" level=info 
 7月 14 15:57:37 nulige dockerd[20924]: time="2018-07-14T15:57:37.012728149+08:00" level=info 
 7月 14 15:57:37 nulige systemd[1]: Started Docker Application Container Engine. 
#获取centos镜像
root@nulige:~# docker pull centos
 Using default tag: latest
 latest: Pulling from library/centos
 7dc0dca2b151: Pull complete 
 Digest: sha256:b67d21dfe609ddacf404589e04631d90a342921e81c40aeaf3391f6717fa5322
 Status: Downloaded newer image for centos:latest 
#查看镜像
root@nulige:~# docker images
 REPOSITORY TAG IMAGE ID CREATED SIZE
 centos latest 49f7960eb7e4 5 weeks ago 200 MB