2017-11-25 01:43:04 +00:00
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## 创建 Swarm 集群
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2017-11-25 02:27:27 +00:00
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阅读 [基本概念](overview.md) 一节我们知道 `Swarm` 集群由管理节点和工作节点组成。本节我们来创建一个包含一个管理节点和两个工作节点的最小 `Swarm` 集群。
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2017-11-25 01:43:04 +00:00
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### 初始化集群
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我们使用 `docker swarm init` 在本机初始化一个 `Swarm` 集群。
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```bash
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$ docker swarm init --advertise-addr 192.168.99.100
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Swarm initialized: current node (dxn1zf6l61qsb1josjja83ngz) is now a manager.
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To add a worker to this swarm, run the following command:
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docker swarm join \
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--token SWMTKN-1-49nj1cmql0jkz5s954yi3oex3nedyz0fb0xx14ie39trti4wxv-8vxv8rssmk743ojnwacrr2e7c \
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192.168.99.100:2377
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To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.
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```
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如果你的 Docker 主机有多个网卡，拥有多个 IP，必须使用 `--advertise-addr` 指定 IP。
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执行 `docker swarm init` 命令的节点自动成为管理节点。
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### 增加工作节点
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上一步中我们在本机初始化了一个 `Swarm` 集群，拥有了一个管理节点，下面我们使用 [`Docker Machine`](../machine) 创建两个 Docker 主机，并加入到集群中。
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```bash
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$ docker-machine create -d virtualbox worker1
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$ docker-machine ssh worker1
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docker@worker1:~$ docker swarm join \
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--token SWMTKN-1-49nj1cmql0jkz5s954yi3oex3nedyz0fb0xx14ie39trti4wxv-8vxv8rssmk743ojnwacrr2e7c \
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192.168.99.100:2377
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This node joined a swarm as a worker.
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```
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```bash
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$ docker-machine create -d virtualbox worker2
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$ docker-machine ssh worker2
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docker@worker1:~$ docker swarm join \
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--token SWMTKN-1-49nj1cmql0jkz5s954yi3oex3nedyz0fb0xx14ie39trti4wxv-8vxv8rssmk743ojnwacrr2e7c \
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192.168.99.100:2377
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This node joined a swarm as a worker.
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```
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2017-11-26 01:54:16 +00:00
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*注意：* 一些细心的读者可能通过 `docker-machine create --help` 查看到 `--swarm*` 等一系列参数。该参数是用于旧的 `Docker Swarm`,与本章所讲的 `Swarm mode` 没有关系。
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2017-11-25 01:43:04 +00:00
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### 查看集群
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经过上边的两步，我们已经拥有了一个最小的 `Swarm` 集群，包含一个管理节点和两个工作节点。
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在管理节点使用 `docker node ls` 查看集群。
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```bash
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$ docker node ls
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ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS
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03g1y59jwfg7cf99w4lt0f662 worker2 Ready Active
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9j68exjopxe7wfl6yuxml7a7j worker1 Ready Active
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dxn1zf6l61qsb1josjja83ngz * manager1 Ready Active Leader
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```
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