CentOs 7.6 安装docker

CentOs 7.6 安装docker

https://docs.docker.com/engine/install/centos/ 

Uninstall old versions

```

$ sudo yum remove docker\

docker-client \docker-client-latest \ 

docker-common \

docker-latest \

docker-latest-logrotate \

docker-logrotate \ 

docker-engine

```

Install using the repository

```

$ sudo yum install -y yum-utils

    $ sudo yum-config-manager \

    --add-repo \

```

    https://download.docker.com/linux/centos/docker-ce.repo

INSTALL DOCKER ENGINE

$ sudo yum install docker-ce docker-ce-cli containerd.io

$ docker swarm init --force-new-cluster --advertise-addr 192.168.1.79:2377    --唯一方法是使用—force-newcluster管理节点的操作,这将去除本机之外的所有管理器身份。

设置swarm缓存数 

$ sudo docker swarm update --task-history-limit 3 #(default 5)

Docker is installed but not started. The docker group is created, but no users are added to the group.

Start Docker.

$ sudo systemctl start docker

If you would like to use Docker as a non-root user, you should now consider adding your user to the “docker” group with something like:

$ sudo usermod-aGdocker your-user

Uninstall Docker Engine

1. Uninstall the Docker Engine, CLI, and Containerd packages:

$ sudo yum remove docker-ce docker-ce-cli containerd.io

2. Images, containers, volumes, or customized configuration files on your host are not automatically removed. To delete all images, containers, and volumes:

$ sudo rm-rf/var/lib/docker

swarm设置

docker swarm join-token worker查看工作节点的 token在集群的leader服务器上生成token

$ docker swarm join --token SWMTKN-1-32nwe7y5wjgfsk8xc68k0m0cu1x0nypjj9bv8v8uvsah49jh8z-3up5uu2lqv4ys10ub2ww14ie9 10.5.30.11:2377加入集群中 在从属的服务器上运行命令

$ docker node ls  --查看所有集群节点

$ docker node update --availability active | pause  hostname  --更新指定主机名的节点状态

$ docker node promote 工作节点主机名1  将一个或多个节点推入到群集管理器中

$ docker node demote从群集(swarm)管理器中降级一个或多个节点

$ docker node rm  hostname|id  从Nodes列表移除指定node 删除某个节点（-f强制删除）

This node joined a swarm as a worker. 看到返回结果，表示成功