一、安装docker报错
刚开始安装docker报这个错：
Error: Transaction test error:
file /usr/libexec/docker/cli-plugins/docker-buildx from install of docker-ce-cli-1:20.10.8-3.el8.x86_64 conflicts with file from package docker-buildx-plugin-0:0.14.0-1.el8.x86_64
根据错误显示发现插件冲突了，删除插件
yum remove docker-buildx-plugin-0:0.14.0-1.el8.x86_64
结果如下：
再次安装
yum install docker-ce-20.10.8-3.el8 docker-ce-cli-20.10.8-3.el8
显示成功
但是无法启动
二、启动问题
使用命令启动结果报错
sudo systemctl start docker
查看状态和错误
但看状态无法发现是什么原因，去查看具体原因
journalctl -u docker.service
结果如下：
-- Logs begin at Wed 2024-12-04 03:55:58 CST, end at Fri 2024-12-06 11:31:04 CST. --
Dec 06 10:43:55 node2 systemd[1]: Starting Docker Application Container Engine...
Dec 06 10:43:55 node2 dockerd[3353521]: failed to start daemon: failed to dial "/run/containerd/containerd.sock": unknown service containerd.services.namespaces.v1.Namespaces: not implemented
Dec 06 10:43:55 node2 systemd[1]: docker.service: Main process exited, code=exited, status=1/FAILURE
Dec 06 10:43:55 node2 systemd[1]: docker.service: Failed with result 'exit-code'.
Dec 06 10:43:55 node2 systemd[1]: Failed to start Docker Application Container Engine.
Dec 06 10:43:58 node2 systemd[1]: docker.service: Service RestartSec=2s expired, scheduling restart.
Dec 06 10:43:58 node2 systemd[1]: docker.service: Scheduled restart job, restart counter is at 1.
Dec 06 10:43:58 node2 systemd[1]: Stopped Docker Application Container Engine.
Dec 06 10:43:58 node2 systemd[1]: Starting Docker Application Container Engine...
Dec 06 10:43:58 node2 dockerd[3353564]: failed to start daemon: failed to dial "/run/containerd/containerd.sock": unknown service containerd.services.namespaces.v1.Namespaces: not implemented
Dec 06 10:43:58 node2 systemd[1]: docker.service: Main process exited, code=exited, status=1/FAILURE
Dec 06 10:43:58 node2 systemd[1]: docker.service: Failed with result 'exit-code'.
Dec 06 10:43:58 node2 systemd[1]: Failed to start Docker Application Container Engine.
Dec 06 10:44:00 node2 systemd[1]: docker.service: Service RestartSec=2s expired, scheduling restart.
Dec 06 10:44:00 node2 systemd[1]: docker.service: Scheduled restart job, restart counter is at 2.
Dec 06 10:44:00 node2 systemd[1]: Stopped Docker Application Container Engine.
Dec 06 10:44:00 node2 systemd[1]: Starting Docker Application Container Engine...
Dec 06 10:44:00 node2 dockerd[3353590]: failed to start daemon: failed to dial "/run/containerd/containerd.sock": unknown service containerd.services.namespaces.v1.Namespaces: not implemented
Dec 06 10:44:00 node2 systemd[1]: docker.service: Main process exited, code=exited, status=1/FAILURE
Dec 06 10:44:00 node2 systemd[1]: docker.service: Failed with result 'exit-code'.
Dec 06 10:44:00 node2 systemd[1]: Failed to start Docker Application Container Engine.
Dec 06 10:44:02 node2 systemd[1]: docker.service: Service RestartSec=2s expired, scheduling restart.
Dec 06 10:44:02 node2 systemd[1]: docker.service: Scheduled restart job, restart counter is at 3.
Dec 06 10:44:02 node2 systemd[1]: Stopped Docker Application Container Engine.
Dec 06 10:44:02 node2 systemd[1]: docker.service: Start request repeated too quickly.
Dec 06 10:44:02 node2 systemd[1]: docker.service: Failed with result 'exit-code'.
Dec 06 10:44:02 node2 systemd[1]: Failed to start Docker Application Container Engine.
Dec 06 10:45:00 node2 systemd[1]: Starting Docker Application Container Engine...
Dec 06 10:45:00 node2 dockerd[3353939]: failed to start daemon: failed to dial "/run/containerd/containerd.sock": unknown service containerd.services.namespaces.v1.Namespaces: not implemented
Dec 06 10:45:00 node2 systemd[1]: docker.service: Main process exited, code=exited, status=1/FAILURE
Dec 06 10:45:00 node2 systemd[1]: docker.service: Failed with result 'exit-code'.
Dec 06 10:45:00 node2 systemd[1]: Failed to start Docker Application Container Engine.
Dec 06 10:45:02 node2 systemd[1]: docker.service: Service RestartSec=2s expired, scheduling restart.
Dec 06 10:45:02 node2 systemd[1]: docker.service: Scheduled restart job, restart counter is at 1.
Dec 06 10:45:02 node2 systemd[1]: Stopped Docker Application Container Engine.
Dec 06 10:45:02 node2 systemd[1]: Starting Docker Application Container Engine...
Dec 06 10:45:02 node2 dockerd[3353993]: failed to start daemon: failed to dial "/run/containerd/containerd.sock": unknown service containerd.services.namespaces.v1.Namespaces: not implemented
Dec 06 10:45:02 node2 systemd[1]: docker.service: Main process exited, code=exited, status=1/FAILURE
Dec 06 10:45:02 node2 systemd[1]: docker.service: Failed with result 'exit-code'.
Dec 06 10:45:02 node2 systemd[1]: Failed to start Docker Application Container Engine.
根据这个报错failed to start daemon: failed to dial "/run/containerd/containerd.sock"去查看，以为是没启动，结果查看是启动的
systemctl status containerd
查看结果如下：
去查看containerd.sock相关权限
执行下列操作：
sudo chown root:docker /run/containerd/containerd.sock
然后直接重启
systemctl restart containerd
结果还是一样：
最后发现需要先停止在重启才能奏效
[root@node2 ~]# systemctl stop containerd
[root@node2 ~]# systemctl start containerd
[root@node2 ~]# systemctl start docker.service
此时查看docker状态已经running了
