使用阿里云加速器提升Docker下载速度

[root@LVS-DR01 ~]# vim /usr/lib/systemd/system/docker.service
Environment=DOCKER_HTTP_HOST_COMPAT=1
Environment=PATH=/usr/libexec/docker:/usr/bin:/usr/sbin
ExecStart=/usr/bin/dockerd-current --registry-mirror=https://ag3w25ij.mirror.aliyuncs.com \
--add-runtime docker-runc=/usr/libexec/docker/docker-runc-current \
--default-runtime=docker-runc \
--exec-opt native.cgroupdriver=systemd \
--userland-proxy-path=/usr/libexec/docker/docker-proxy-current \
$OPTIONS \
$DOCKER_STORAGE_OPTIONS \
$DOCKER_NETWORK_OPTIONS \
$ADD_REGISTRY \
$BLOCK_REGISTRY \
$INSECURE_REGISTRY\
$REGISTRIES
ExecReload=/bin/kill -s HUP $MAINPID
LimitNOFILE=1048576
LimitNPROC=1048576
LimitCORE=infinity
TimeoutStartSec=0
Restart=on-abnormal
MountFlags=slave
KillMode=process
[Install]
WantedBy=multi-user.target
说明：--registry-mirror=https://ag3w25ij.mirror.aliyuncs.com
重新加载服务：
[root@LVS-DR01 ~]# systemctl daemon-reload
[root@LVS-DR01 ~]# systemctl restart docker
[root@LVS-DR01 ~]# systemctl status docker
● docker.service - Docker Application Container Engine
Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled)
Active: active (running) since Tue 2017-10-10 14:52:00 CST; 5s ago
Docs: http://docs.docker.com Main PID: 15440 (dockerd-current)
CGroup: /system.slice/docker.service
├─15440 /usr/bin/dockerd-current --registry-mirror=https://ag3w25ij.mirror.aliyuncs.com --add-runtime docker-runc=/usr/libexec/docker/...
└─15450 /usr/bin/docker-containerd-current -l unix:///var/run/docker/libcontainerd/docker-containerd.sock --shim docker-containerd-shi...
Oct 10 14:51:59 LVS-DR01.saltstack.com dockerd-current[15440]: time="2017-10-10T14:51:59.958764236+08:00" level=warning msg="Docker could n...ystem"
Oct 10 14:51:59 LVS-DR01.saltstack.com dockerd-current[15440]: time="2017-10-10T14:51:59.999187185+08:00" level=info msg="Graph migration t...conds"
Oct 10 14:52:00 LVS-DR01.saltstack.com dockerd-current[15440]: time="2017-10-10T14:51:59.999815473+08:00" level=info msg="Loading container...tart."
Oct 10 14:52:00 LVS-DR01.saltstack.com dockerd-current[15440]: time="2017-10-10T14:52:00.167327215+08:00" level=info msg="Firewalld running: false"
Oct 10 14:52:00 LVS-DR01.saltstack.com dockerd-current[15440]: time="2017-10-10T14:52:00.382002365+08:00" level=info msg="Default bridge (d...dress"
Oct 10 14:52:00 LVS-DR01.saltstack.com dockerd-current[15440]: time="2017-10-10T14:52:00.469707171+08:00" level=info msg="Loading containers: done."
Oct 10 14:52:00 LVS-DR01.saltstack.com dockerd-current[15440]: time="2017-10-10T14:52:00.469839570+08:00" level=info msg="Daemon has comple...ation"
Oct 10 14:52:00 LVS-DR01.saltstack.com dockerd-current[15440]: time="2017-10-10T14:52:00.469858378+08:00" level=info msg="Docker daemon" co...1.12.6
Oct 10 14:52:00 LVS-DR01.saltstack.com systemd[1]: Started Docker Application Container Engine.
Oct 10 14:52:00 LVS-DR01.saltstack.com dockerd-current[15440]: time="2017-10-10T14:52:00.501638339+08:00" level=info msg="API listen on /va....sock"
Hint: Some lines were ellipsized, use -l to show in full.

[root@LVS-DR01 ~]# docker pull alpine
Using default tag: latest
Trying to pull repository docker.io/library/alpine ...
latest: Pulling from docker.io/library/alpine
88286f41530e: Pull complete
Digest: sha256:f006ecbb824d87947d0b51ab8488634bf69fe4094959d935c0c103f4820a417d