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[TOC]

### （1）创建四个虚拟机（1核2G即可）
这里四个虚拟机ip分别为：
* 192.168.145.128
* 192.168.145.129
* 192.168.145.130
* 192.168.145.131

### （2）每个虚拟机安装docker
参照  [Docker----CentOS7系统上Docker的安装与卸载](http://blog.redrose2100.com/article/59) 为四个虚拟机安装docker
### （3）查看docker swarm 帮助文档
```bash
[root@localhost ~]# docker swarm --help

Usage:  docker swarm COMMAND

Manage Swarm

Commands:
  ca          Display and rotate the root CA
  init        Initialize a swarm
  join        Join a swarm as a node and/or manager
  join-token  Manage join tokens
  leave       Leave the swarm
  unlock      Unlock swarm
  unlock-key  Manage the unlock key
  update      Update the swarm

Run 'docker swarm COMMAND --help' for more information on a command.
[root@localhost ~]#
```
### （4）查看docker swarm init 的帮助文档

```bash
[root@localhost ~]# docker swarm init --help

Usage:  docker swarm init [OPTIONS]

Initialize a swarm

Options:
      --advertise-addr string                  Advertised address (format: <ip|interface>[:port])
      --autolock                               Enable manager autolocking (requiring an unlock key to start a stopped manager)
      --availability string                    Availability of the node ("active"|"pause"|"drain") (default "active")
      --cert-expiry duration                   Validity period for node certificates (ns|us|ms|s|m|h) (default 2160h0m0s)
      --data-path-addr string                  Address or interface to use for data path traffic (format: <ip|interface>)
      --data-path-port uint32                  Port number to use for data path traffic (1024 - 49151). If no value is set or is set to 0, the default port (4789) is used.
      --default-addr-pool ipNetSlice           default address pool in CIDR format (default [])
      --default-addr-pool-mask-length uint32   default address pool subnet mask length (default 24)
      --dispatcher-heartbeat duration          Dispatcher heartbeat period (ns|us|ms|s|m|h) (default 5s)
      --external-ca external-ca                Specifications of one or more certificate signing endpoints
      --force-new-cluster                      Force create a new cluster from current state
      --listen-addr node-addr                  Listen address (format: <ip|interface>[:port]) (default 0.0.0.0:2377)
      --max-snapshots uint                     Number of additional Raft snapshots to retain
      --snapshot-interval uint                 Number of log entries between Raft snapshots (default 10000)
      --task-history-limit int                 Task history retention limit (default 5)
[root@localhost ~]#
```
### （5）在192.168.145.128上创建一个swarm集群

```bash
[root@localhost ~]# docker swarm init --advertise-addr 192.168.145.128
Swarm initialized: current node (wsqaq4isrzhlgphnnaqxucy6r) is now a manager.

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

docker swarm join --token SWMTKN-1-052n8lzu6tqwlz9osydt5ttcr268i4fxqpbgyps49nmvmh4ym6-50iq7p13l75w9oken3xqgqpnr 192.168.145.128:2377

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

[root@localhost ~]#
```
### （6）查看当前集群中的节点信息
如下，表示当前集群中只有一个leader主节点
```bash
[root@localhost ~]# docker node ls
ID                            HOSTNAME                STATUS    AVAILABILITY   MANAGER STATUS   ENGINE VERSION
wsqaq4isrzhlgphnnaqxucy6r *   localhost.localdomain   Ready     Active         Leader           20.10.10
[root@localhost ~]#

```
### （7）在192.168.145.128 上查看增加manager节点的方法

```bash
[root@localhost ~]# docker swarm join-token manager
To add a manager to this swarm, run the following command:

docker swarm join --token SWMTKN-1-052n8lzu6tqwlz9osydt5ttcr268i4fxqpbgyps49nmvmh4ym6-5n9bpvj1v64wb9cvg7l2fitaj 192.168.145.128:2377

[root@localhost ~]#
```
### （8）增加节点
将上述（7）中查询到的增加manager节点的命令复制一下，然后分别在192.168.145.129和192.168.145.130节点上执行
注意：需要在每个虚拟机上关闭防火墙

```bash
systemctl stop firewalld
```

如下，在192.168.145.129节点上：

```bash
[root@localhost ~]# docker swarm join --token SWMTKN-1-052n8lzu6tqwlz9osydt5ttcr268i4fxqpbgyps49nmvmh4ym6-5n9bpvj1v64wb9cvg7l2fitaj 192.168.145.128:2377
This node joined a swarm as a manager.
[root@localhost ~]#
```
### （9）此时，查看集群中节点信息
如下已经有三个manager节点了
```bash
[root@localhost ~]# docker node ls
ID                            HOSTNAME                STATUS    AVAILABILITY   MANAGER STATUS   ENGINE VERSION
fhpe4p0m4gb47pxh48kf9psp8     localhost.localdomain   Ready     Active         Reachable        20.10.10
p1cfiyfyxgkhupjj03tvq40ph     localhost.localdomain   Ready     Active         Reachable        20.10.10
wsqaq4isrzhlgphnnaqxucy6r *   localhost.localdomain   Ready     Active         Leader           20.10.10
[root@localhost ~]#
```
### （10）在manager节点查看加入worker节点的命令
如，在192.168.145.128上查看

```bash
[root@localhost ~]# docker swarm join-token worker
To add a worker to this swarm, run the following command:

docker swarm join --token SWMTKN-1-052n8lzu6tqwlz9osydt5ttcr268i4fxqpbgyps49nmvmh4ym6-50iq7p13l75w9oken3xqgqpnr 192.168.145.128:2377

[root@localhost ~]#
```
### （11）增加worker节点
将上述（10）中查询到的命令复制拷贝到192.168.145.131上执行，增加worker节点
如下：在192.168.145.131上

```bash
[root@localhost ~]# docker swarm join --token SWMTKN-1-052n8lzu6tqwlz9osydt5ttcr268i4fxqpbgyps49nmvmh4ym6-50iq7p13l75w9oken3xqgqpnr 192.168.145.128:2377
This node joined a swarm as a worker.
[root@localhost ~]#
```
### （12）查看集群节点信息
再次在192.168.145.128上查看当前集群节点信息，在任意manager节点上均可查看，
```bash
[root@localhost ~]# docker node ls
ID                            HOSTNAME                STATUS    AVAILABILITY   MANAGER STATUS   ENGINE VERSION
fhpe4p0m4gb47pxh48kf9psp8     localhost.localdomain   Ready     Active         Reachable        20.10.10
p1cfiyfyxgkhupjj03tvq40ph     localhost.localdomain   Ready     Active         Leader           20.10.10
wsqaq4isrzhlgphnnaqxucy6r *   localhost.localdomain   Ready     Active         Reachable        20.10.10
xlgi99te9cchyz9n3ydkycf6k     localhost.localdomain   Ready     Active                          20.10.10
```
此时集群环境已经搭建OK了

### （13）验证一下集群环境的高可用
将192.168.145.129环境上的docker服务停掉，模拟节点挂了

```bash
[root@localhost ~]# systemctl stop docker
Warning: Stopping docker.service, but it can still be activated by:
  docker.socket
[root@localhost ~]#
```
### （14）查看节点状态
再次回到192.168.145.128节点上查看节点状态，如下。集群整体状态仍然OK
```bash
[root@localhost ~]# docker node ls
ID                            HOSTNAME                STATUS    AVAILABILITY   MANAGER STATUS   ENGINE VERSION
fhpe4p0m4gb47pxh48kf9psp8     localhost.localdomain   Ready     Active         Reachable        20.10.10
p1cfiyfyxgkhupjj03tvq40ph     localhost.localdomain   Down      Active         Unreachable      20.10.10
wsqaq4isrzhlgphnnaqxucy6r *   localhost.localdomain   Ready     Active         Leader           20.10.10
xlgi99te9cchyz9n3ydkycf6k     localhost.localdomain   Ready     Active                          20.10.10
[root@localhost ~]#
```

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