Docker-swarm容器编排

1. 先安装docker

curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
curl -o /etc/yum.repos.d/docker-ce.repo https://download.docker.com/linux/centos/docker-ce.repo
sed -i 's+download.docker.com+mirrors.tuna.tsinghua.edu.cn/docker-ce+' /etc/yum.repos.d/docker-ce.repo
 
#这是查看docker都要那些版本（可以不用管）
yum list docker-ce --showduplicates

yum -y install docker-ce-18.09.9 docker-ce-cli-18.09.9
yum -y install bash-completion
source /usr/share/bash-completion/bash_completion

#禁用防火墙、禁用selinux
systemctl enable --now docker && systemctl status docker
systemctl disable --now firewalld
sed -i 's/^SELINUX=enforcing$/SELINUX=disabled/' /etc/selinux/config 
grep ^SELINUX= /etc/selinux/config

2. docker-swarm初始化

[root@docker01 ~]# docker swarm init --advertise-addr 10.0.0.40
Swarm initialized: current node (yqel2ya881rt75i8pvgwtkbl6) is now a manager.

To add a worker to this swarm, run the following command:
#其它node节点分别执行这个命令加入集群
    docker swarm join --token SWMTKN-1-1usvgogb8a1cmb3zxgpwp8quwtlrohh0qijwqcic8g6c48fn53-2pj9725lanuo849mcdfgdzsr6 10.0.0.40:2377

To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.

#查看集群是否添加进来
[root@docker01 ~]# docker node ls
ID                            HOSTNAME            STATUS              AVAILABILITY        MANAGER STATUS      ENGINE VERSION
yqel2ya881rt75i8pvgwtkbl6 *   docker01            Ready               Active              Leader              19.03.15
sz0l4yegkp4943jz6bf92ba7t     docker02            Ready               Active                                  19.03.15
uvs696abquqk7euc1eavifs8m     docker03            Ready               Active                                  19.03.15

#运行的端口2377

3. docker-swarm集群高可用

#先把集群打上标签
[root@docker01 ~]# docker node update --label-add name=swarm-master1 docker01
docker01
[root@docker01 ~]# docker node update --label-add name=swarm-node1 docker02
docker02
[root@docker01 ~]# docker node update --label-add name=swarm-node2 docker03
docker03

#提示角色权限 如果master节点宕机 node节点可以接管msater
[root@docker01 ~]# docker node promote docker02
Node docker02 promoted to a manager in the swarm.
[root@docker01 ~]# docker node promote docker03
Node docker03 promoted to a manager in the swarm.

#查看信息
[root@docker01 ~]# docker node inspect docker01

#可以停止下docker01的服务 然后docker02 docker03会选举master
[root@docker01 ~]# systemctl stop docker

4. docker-swarm创建网络

[root@docker01 ~]# docker network create -d overlay --subnet=10.220.0.0/21  --gateway=10.220.0.1 --attachable network-name
lxsiiqurwvzlc0ejv0w0zwp8u
[root@docker01 ~]# docker network ls
NETWORK ID          NAME                DRIVER              SCOPE
00d14a29f4c8        bridge              bridge              local
4d26921ab564        docker_gwbridge     bridge              local
ab9a47f52b5a        host                host                local
gj3msmhrw6l6        ingress             overlay             swarm
lxsiiqurwvzl        network-name        overlay             swarm
8a0e6b07272e        none                null                local

5. docker-swarm创建一个服务

[root@docker01 ~]# docker service create --replicas 2 -p 8888:80 --network network-name --name nginx nginx:1.18-alpine