Swarm群集搭建

Posted 2021-02-01

Swarm是一套极为简单管理docker集群工具，使得docker集群暴露给用户的是一个虚拟整体。
搭建环境：

关闭防火墙和安全linux
[[email protected] ~]# systemctl stop firewalld
[[email protected] ~]# setenforce 0
分别修改主机名：
[[email protected] ~]# vi /etc/hostname
swarm01
swarm02
重启并分别添加一张桥接网卡联网
[[email protected] ~]# systemctl restart network
[[email protected] ~]# systemctl restart network
[[email protected] ~]# vi /etc/yum.repos.d/CentOS-Base.repo //分别配置yum源
[docker-repo]
name=Docker Repository
baseurl=https://yum.dockerproject.org/repo/main/centos/7/
enabled=1
gpgcheck=1
gpgkey=https://yum.dockerproject.org/gpg
[base]
name=centos-$releasever - Base
baseurl=file:///mnt
enabled=1
gpgcheck=0
[[email protected] ~]# vi /etc/yum.repos.d/CentOS-Base.repo
[docker-repo]
name=Docker Repository
baseurl=https://yum.dockerproject.org/repo/main/centos/7/
enabled=1
gpgcheck=1
gpgkey=https://yum.dockerproject.org/gpg
[base]
name=centos-$releasever - Base
baseurl=file:///mnt
enabled=1
gpgcheck=0
分别下载安装docker：
yum install -y docker-engine
systemctl enable docker
systemctl start docker
修改docker的监听端口
[[email protected] ~]# vi /lib/systemd/system/docker.service
在ExecStart后加入:
-H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock

[[email protected] ~]# systemctl daemon-reload //重新加载配置文件
[[email protected] ~]# systemctl restart docker //重新启动docker
[[email protected] ~]# docker pull swarm
[[email protected] ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
swarm latest ff454b4a0e84 7 months ago 12.7MB
[[email protected] ~]# docker pull swarm
[[email protected] ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
swarm latest ff454b4a0e84 7 months ago 12.7MB //下载swarm成功
初始化Swarm
[[email protected] ~]# docker swarm init --advertise-addr 192.168.100.30
上面命令执行后，该机器自动加入到swarm集群。这个会创建一个集群token，
获取全球唯一的 token，作为集群唯一标识。后续将其他节点加入集群都会用到这个token值。

查看swarm节点

[[email protected] ~]# docker swarm join --token SWMTKN-1-45wi0d159hormsyptmtnve18a1sas6zfo1alxzsk60ow5ii36t-bi167goeagg6tb0yf9dnzgmcv 192.168.100.30:2377

Swarm02加入swarm群集之后有两个节点了，后面有几台服务器都可以用这个token值加入swarm群集
创建集群网络overlay
[[email protected] ~]# docker network create --driver overlay skynet
docker network ls 查看！

[[email protected] ~]# docker pull httpd

部署测试
[[email protected] ~]# docker service create -p 80:80 --name webserver --replicas 4 httpd //如果要继续加服务如nginx，前面80端口要改，服务名也要改
[[email protected] ~]# docker service ls //查看服务列表
[[email protected] ~]# docker service ps webserver | grep Running //查看具体服务开启情况

访问：http://192.168.100.30/
http://192.168.100.40/


全程swarm02没有下载过httpd服务
如果访问不了就重启docker ，systemctl restart docker