前言

    在k8s的系列學習中，需要使用docker的環境，在安裝docker的過程中遇到的一些問題在這裡分享一下。通過查詢資料發現之前的文章解決不了，後來讓華玫妹妹給我指點了一下，思路是沒問題的，但是自己的操作太生疏了，修改檔案簡單地操作都是個問題，需要不斷地練習啊！

安裝步驟

[root@localhost ~]# yum update
[root@localhost ~]# yum install docker

[root@localhost ~]# service docker start

Redirecting to /bin/systemctl start docker.service
Job for
 
 docker.service failed because the control process exited with error code. See "systemctl status docker.service" and "journalctl -xe" for details.

[root@localhost ~]# systemctl status docker.service

● docker.service - Docker Application Container Engine
Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled)
Active: failed (Result: exit-code) since 日 2018
 
-04-08 13:00:31 CST; 11min ago
Docs: http://docs.docker.com
Process: 44128 ExecStart=/usr/bin/dockerd-current --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 --seccomp-profile=/etc/docker/seccomp.json $OPTIONS
 
 $DOCKER_STORAGE_OPTIONS $DOCKER_NETWORK_OPTIONS $ADD_REGISTRY $BLOCK_REGISTRY $INSECURE_REGISTRY $REGISTRIES (code=exited, status=1/FAILURE)
 Main PID: 44128 (code=exited, status=1/FAILURE)
 4月 08 13:00:30 localhost.localdomain systemd[1]: Starting Docker Application Container Engine...
 //後面還有具體的就不一一列舉了

嘗試一

參考：解決方案

# yum remove docker
# yum remove docker-selinux

# vi /etc/yum.repos.d/docker.repo

//要開啟docker.repo，提示我【new file】

    到這裡就進行不下去了，於是就換了另外的方法。

嘗試二

[root@localhost ~]# cd /usr/lib/systemd/system
[root@localhost system]# ls

[root@localhost system]# vi docker.service

[root@localhost system]# systemctl daemon-reload

[root@localhost system]# systemctl restart docker

[root@localhost system]# systemctl status docker.service

    在修改docker.service的時候由於操作不太熟悉，我直接開啟檔案修改的。只將ExecStart內容都修改了。（小白福利）效果如下：

[Unit]
Description=Docker Application Container Engine
Documentation=http://docs.docker.com
After=network.target rhel-push-plugin.socket registries.service
Wants=docker-storage-setup.service
Requires=docker-cleanup.timer

[Service]
Type=notify
NotifyAccess=all
EnvironmentFile=-/run/containers/registries.conf
EnvironmentFile=-/etc/sysconfig/docker
EnvironmentFile=-/etc/sysconfig/docker-storage
EnvironmentFile=-/etc/sysconfig/docker-network
Environment=GOTRACEBACK=crash
Environment=DOCKER_HTTP_HOST_COMPAT=1
Environment=PATH=/usr/libexec/docker:/usr/bin:/usr/sbin
ExecStart=/usr/bin/dockerd --insecure-registry=sz-pg-oam-docker-hub-001.tendcloud.com -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock
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

    現在docker服務可以啟動了。