随笔记录，因为公司网络隔离问题，上网需要配置指定的DNS，使用docker pull命令拉取镜像的时候会出现很多报错异常，接下来就通过HTTP代理解决问题。
1、指定目录新建docker.service.d文件夹和docker proxy.conf
sudo mkdir -p /etc/systemd/system/docker.service.d
sudo touch /etc/systemd/system/docker.service.d/proxy.conf
2、编辑proxy.conf，内容如下：
[Service]
Environment="HTTP_PROXY=:8080/"
Environment="HTTPS_PROXY=:8080/"
Environment="NO_PROXY=localhost,127.0.0.1,.example.com"
注意：替换成自己的代理地址
3、加载代理配置和重启docker服务
systemctl daemon-reload
service docker restart
4、docker info 验证代理是否配置成功，如下39,40行
Containers: 0
Running: 0
Paused: 0
Stopped: 0
Images: 2
Server Version: 18.03.0-ce
Storage Driver: overlay2
Backing Filesystem: xfs
Supports d_type: true
Native Overlay Diff: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
Volume: local
Network: bridge host macvlan null overlay
Log: awslogs fluentd gcplogs gelf journald json-file logentries splunk syslog
Swarm: inactive
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: cfd04396dc68220d1cecbe686a6cc3aa5ce3667c
runc version: 4fc53a81fb7cac585fa9ca
init version: 949e6fa
Security Options:
seccomp
Profile: default
Kernel Version: 3.10.0-862.el7.x86_64
Operating System: CentOS Linux 7 (Core)
OSType: linux
Architecture: x86_64
CPUs: 48
Total Memory: 251.4GiB
Name: scm
ID: M2SP:5JTN:TGQV:MXFT:H5BG:CJD7:MI6Y:4IEH:3GCU:6IKF:FXPQ:FLG5
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): false
HTTP Proxy: :8118
HTTPS Proxy: :8118
No Proxy: localhost,127.0.0.1,.example.com
Username: howdylovely
Registry:
Labels:
Experimental: false
Insecure Registries:
10.0.0.12:5000
127.0.0.0/8
Registry Mirrors:
Live Restore Enabled: false
5、使用docker pull redis 拉取镜像验证是否成功！
