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Swarm

Docker Swarm provides native clustering functionality for Docker containers, which turns a group of Docker engines into a single, virtual Docker engine.

In Docker 1.12 and higher, Swarm mode is integrated with Docker Engine. The swarm CLI utility allows users to run various commands to manage nodes in a Swarm, for example, create containers, create discovery tokens, list nodes in the cluster, and more.

Environment

  • Hostname：u14-swarm-master
    • OS：Ubuntu 14.04
    • IP：10.211.55.24
    • RAM：1G
    • DISK：20G
  • Hostname：u14-swarm-node01
    • OS：Ubuntu 14.04
    • IP：10.211.55.23
    • RAM：1G
    • DISK：20G

Create swarm

mastar

初始化 swarm，並且會生成一組 token。

u14-swarm-master:~$ sudo docker swarm init --advertise-addr 10.211.55.24
Swarm initialized: current node (gw2mhaiqw5gzgtvogqrf4aw6g) is now a manager.

To add a worker to this swarm, run the following command:

    docker swarm join --token SWMTKN-1-2a9t9te4ewe4kvk0gm9ulcsnkt3ikuj5qttjqup87dkxvni9ri-dqhuxopn24sgf48milcf9cch5 10.211.55.24:2377

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

node

將 master 上的生成的 token 貼上，便會加入 swarm。

u14-swarm-node01:~$ sudo docker swarm join --token SWMTKN-1-2a9t9te4ewe4kvk0gm9ulcsnkt3ikuj5qttjqup87dkxvni9ri-dqhuxopn24sgf48milcf9cch5 10.211.55.24:2377
This node joined a swarm as a worker.

verify

在 master 檢查節點是否正常運作

u14-swarm-master:~$ sudo docker node ls 
ID                            HOSTNAME            STATUS              AVAILABILITY        MANAGER STATUS
gw2mhaiqw5gzgtvogqrf4aw6g *   u14-swarm-master    Ready               Active              Leader
kgre56574jb0ivl79z6gm3939     u14-swarm-node01    Ready               Active