[root@iZbp12f9404um3f6avsm29Z ~]# docker ps Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
今天重启服务器时报了：Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
翻译过来就是：无法连接到Docker守护进程在unix:///var/run/ Docker .sock。docker守护进程正在运行吗?
这个主要的问题就是docker没有启动起来导致的...
启动docker并查看运行状态是否成功
[root@iZbp12f9404um3f6avsm29Z ~]# systemctl start docker
[root@iZbp12f9404um3f6avsm29Z ~]# systemctl status docker
● docker.service - Docker Application Container Engine
Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled)
Active: active (running) since Tue 2021-06-15 17:49:40 CST; 7min ago
Docs: http://docs.docker.com
Main PID: 1320 (dockerd-current)
Tasks: 40
Memory: 11.5M
CGroup: /system.slice/docker.service
├─1320 /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 --init-path=/usr/libexec/d...
├─1326 /usr/bin/docker-containerd-current -l unix:///var/run/docker/libcontainerd/docker-containerd.sock --metrics-interval=0 --start-timeout 2m --state-dir /var/run/docker/libcontainerd/containerd --shim docker-containerd-shim --runtime docker-runc --runt...
├─1448 /usr/libexec/docker/docker-proxy-current -proto tcp -host-ip 0.0.0.0 -host-port 33306 -container-ip 172.17.0.2 -container-port 3306
└─1454 /usr/bin/docker-containerd-shim-current 26c8d35946e20d5b146602e4c48d501a17ae259184a1016b1f7efbb4cf439f6c /var/run/docker/libcontainerd/26c8d35946e20d5b146602e4c48d501a17ae259184a1016b1f7efbb4cf439f6c /usr/libexec/docker/docker-runc-current
Jun 15 17:49:40 iZbp12f9404um3f6avsm29Z dockerd-current[1320]: 2021-06-15 09:49:40 1 [Note] InnoDB: 5.6.51 started; log sequence number 1626017
Jun 15 17:49:40 iZbp12f9404um3f6avsm29Z dockerd-current[1320]: 2021-06-15 09:49:40 1 [Note] RSA private key file not found: /usr/data//private_key.pem. Some authentication plugins will not work.
Jun 15 17:49:40 iZbp12f9404um3f6avsm29Z dockerd-current[1320]: 2021-06-15 09:49:40 1 [Note] RSA public key file not found: /usr/data//public_key.pem. Some authentication plugins will not work.
Jun 15 17:49:40 iZbp12f9404um3f6avsm29Z dockerd-current[1320]: 2021-06-15 09:49:40 1 [Note] Server hostname (bind-address): '*'; port: 3306
Jun 15 17:49:40 iZbp12f9404um3f6avsm29Z dockerd-current[1320]: 2021-06-15 09:49:40 1 [Note] IPv6 is available.
Jun 15 17:49:40 iZbp12f9404um3f6avsm29Z dockerd-current[1320]: 2021-06-15 09:49:40 1 [Note] - '::' resolves to '::';
Jun 15 17:49:40 iZbp12f9404um3f6avsm29Z dockerd-current[1320]: 2021-06-15 09:49:40 1 [Note] Server socket created on IP: '::'.
Jun 15 17:49:40 iZbp12f9404um3f6avsm29Z dockerd-current[1320]: 2021-06-15 09:49:40 1 [Note] Event Scheduler: Loaded 0 events
Jun 15 17:49:40 iZbp12f9404um3f6avsm29Z dockerd-current[1320]: 2021-06-15 09:49:40 1 [Note] mysqld: ready for connections.
Jun 15 17:49:40 iZbp12f9404um3f6avsm29Z dockerd-current[1320]: Version: '5.6.51' socket: '/var/run/mysqld/mysqld.sock' port: 3306 MySQL Community Server (GPL)
看到running的标志，就是运行成功了...
为了避免日后重启再次出现类似情况，增加一个开机自动启动docker...
[root@iZbp12f9404um3f6avsm29Z ~]# systemctl enable docker Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service.
以上总结或许能帮助到你，或许帮助不到你，但还是希望能帮助到你，如有疑问、歧义，评论区留言会及时修正发布，谢谢！
未完，待续…
一直都在努力，希望您也是
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