docker (centOS 7) 使用筆記3 - docker swarm mode

1. 什麼是docker swarm mode

docker engine自帶的 容器管理 工具。功能比較早的 docker swarm 更多，且集成在docker engine裏。

(docker version >= v1.12 )

 

2. 網絡環境要求

　　* 節點的IP地址互相能夠訪問如下端口：

　　   2377 (TCP)

　　　7946 (TCP, UDP) 

　　   4789 (UDP)

 

3. 建立swarm mode流程（以1個manager，2個worker爲例）

(1) 初始化第1個manager 

[root@w02 ~]# docker swarm init --advertise-addr 10.10.10.100:2377 
Swarm initialized: current node (64p5nlxp9ni8p2qi1hvsmvbyn) is now a manager. 
To add a worker to this swarm, run the following command: 
docker swarm join \
 --token SWMTKN-1-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx \
 10.10.10.100:2377

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

(2) 添加worker

如上提示 

[root@w07 ~]# docker swarm join \ --token SWMTKN-1-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx \ 10.10.10.100:2377

This node joined a swarm as a worker.

執行成功後，查看狀態：

[root@w07 ~]# docker info

能夠看到有下面這段：

Swarm: active
 NodeID: 25alak1m2ow409qbbp0j4y906
 Is Manager: false
 Node Address: 10.10.10.100

在manage節點上查看節點列表：

[root@w02 ~]# docker node ls
ID                           HOSTNAME  STATUS  AVAILABILITY  MANAGER STATUS
25alak1m2ow409qbbp0j4y906    w07       Ready   Active        
64p5nlxp9ni8p2qi1hvsmvbyn *  w02       Ready   Active        Leader

添加第2個節點後：

[root@w02 shells]# docker node ls
ID                           HOSTNAME  STATUS  AVAILABILITY  MANAGER STATUS
25alak1m2ow409qbbp0j4y906    w07       Ready   Active        
64p5nlxp9ni8p2qi1hvsmvbyn *  w02       Ready   Active        Leader
a2fdbsq15mhcz1jeymvmlrypz    w08       Ready   Active        

 

4. 啓動服務(service)

docker service create \
--name=api_test \
--replicas=1 \
--limit-cpu=4 \
-p 58080:8080 \
10.28.229.2:5000/tomcat9:apiplatform \
/root/tomcat.sh