docker-swarm集群搭建

目录

 一、docker swarm介绍

二、部署docker

三、搭建集群

3.1  工作模式

 3.2  将当前主机作为leader

3.3  将第二个节点slave1加入到worker

3.4  将第三个节点slave2也加入到worker

3.5  将第四个节点(slave3)加入到manager

四、总结

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 一、docker swarm介绍

Docker Swarm是一个用于构建和管理容器集群的工具。它允许你将多个Docker主机组成一个虚拟的单一主机，以便更好地扩展应用程序，并提供高可用性和负载均衡。Swarm使用了一种称为"swarm mode"的特殊模式来管理集群。

在Swarm中，你可以将多个Docker主机连接到一个Swarm集群，并使用docker service命令来创建和管理服务。服务是由一组任务（或容器）组成的，并且可以指定副本数、网络配置、容器启动参数等。Swarm会自动将任务分配到可用的主机上，以实现负载均衡和高可用性。

Docker Swarm还提供了内置的负载均衡和服务发现机制，它能够自动将流量路由到运行任务的节点上，并保证服务的可用性。此外，Swarm还具备故障恢复的能力，当某个节点出现故障时，Swarm会自动重新调度任务到其他可用的节点上。

二、部署docker

创建四台虚拟机或者四台服务器

部署过程如下

安装部署docker全部过程以及基础使用命令入门必看！-CSDN博客

shell脚本一键部署docker-CSDN博客

保证四个都安装成功

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三、搭建集群

3.1  工作模式

为了便于查看，更改主机名

节点的主机名分别为：master   slave1   slave2   slave3

查看当前网络

[root@master ~]# docker network ls
NETWORK ID     NAME      DRIVER    SCOPE
b786a56417fd   bridge    bridge    local
7bcb407e6553   host      host      local
47f66a3a9185   none      null      local

查看帮助

[root@master ~]# docker swarm --help
 
Usage:  docker swarm COMMAND
 
Manage Swarm
 
Commands:
  init        Initialize a swarm
  join        Join a swarm as a node and/or manager
 
Run 'docker swarm COMMAND --help' for more information on a command.
 
[root@master ~]# docker swarm init --help
 
Usage:  docker swarm init [OPTIONS]
 
Initialize a swarm
 
Options:
      --advertise-addr string                  Advertised address (format: "[: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:
                                               "")
      --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: "[: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)

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 3.2  将当前主机作为leader

[root@master ~]# ip a
1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: ens33:  mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:d9:41:26 brd ff:ff:ff:ff:ff:ff
    inet 192.168.200.10/24 brd 192.168.200.255 scope global noprefixroute ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fed9:4126/64 scope link
       valid_lft forever preferred_lft forever
3: docker0:  mtu 1500 qdisc noqueue state DOWN group default
    link/ether 02:42:2f:5c:d0:b8 brd ff:ff:ff:ff:ff:ff
    inet 172.17.0.1/16 brd 172.17.255.255 scope global docker0
       valid_lft forever preferred_lft forever
 
[root@master ~]# docker swarm init --advertise-addr 192.168.200.10
Swarm initialized: current node (0r9pr636ujer02raru7kcpgw9) is now a manager.
 
To add a worker to this swarm, run the following command:
 
    docker swarm join --token SWMTKN-1-2pwtfth6qpuypkez62l411vlcsng0zw48q6immmg3aeoydf5fj-4m1wj6met556fugcqbl2dk2uz 192.168.200.10:2377
 
To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.
 

 节点1(master)为leader

初始化节点 docker swarm init

docker swarm join 加入一个节点！

# 获取令牌

docker swarm join-token manager

docker swarm join-token worker

3.3  将第二个节点slave1加入到worker

[root@master ~]# docker swarm join --token SWMTKN-1-2pwtfth6qpuypkez62l411vlcsng0zw48q6immmg3aeoydf5fj-4m1wj6met556fugcqbl2dk2uz 192.168.200.10:2377
This node joined a swarm as a worker.

第一个节点master查看node

[root@master ~]# docker node ls
ID                            HOSTNAME   STATUS    AVAILABILITY   MANAGER STATUS   ENGINE VERSION
0r9pr636ujer02raru7kcpgw9 *   master     Ready     Active         Leader           25.0.4
o622mci81bykwzj5ujczut3jy     slave1     Ready     Active                          25.0.4

创建worker密钥

[root@master ~]# docker swarm join-token worker
To add a worker to this swarm, run the following command:
 
    docker swarm join --token SWMTKN-1-2pwtfth6qpuypkez62l411vlcsng0zw48q6immmg3aeoydf5fj-4m1wj6met556fugcqbl2dk2uz 192.168.200.10:2377

3.4  将第三个节点slave2也加入到worker

[root@slave2 ~]# docker swarm join --token SWMTKN-1-2pwtfth6qpuypkez62l411vlcsng0zw48q6immmg3aeoydf5fj-4m1wj6met556fugcqbl2dk2uz 192.168.200.10:2377
This node joined a swarm as a worker.

master节点再次查看node

[root@master ~]# docker node ls
ID                            HOSTNAME   STATUS    AVAILABILITY   MANAGER STATUS   ENGINE VERSION
0r9pr636ujer02raru7kcpgw9 *   master     Ready     Active         Leader           25.0.4
o622mci81bykwzj5ujczut3jy     slave1     Ready     Active                          25.0.4
ykwdxdwl589cxox8ffevap4hb     slave2     Ready     Active                          25.0.4

3.5  将第四个节点(slave3)加入到manager

创建manager密钥

[root@master ~]# docker swarm join-token manager
To add a manager to this swarm, run the following command:
 
    docker swarm join --token SWMTKN-1-2pwtfth6qpuypkez62l411vlcsng0zw48q6immmg3aeoydf5fj-5ntj8tg2i2vahtljs614qjydj 192.168.200.10:2377

在slave3节点上使用

[root@slave3 ~]# docker swarm join --token SWMTKN-1-2pwtfth6qpuypkez62l411vlcsng0zw48q6immmg3aeoydf5fj-5ntj8tg2i2vahtljs614qjydj 192.168.200.10:2377
This node joined a swarm as a manager.

master节点再次查看

[root@master ~]# docker node ls
ID                            HOSTNAME   STATUS    AVAILABILITY   MANAGER STATUS   ENGINE VERSION
0r9pr636ujer02raru7kcpgw9 *   master     Ready     Active         Leader           25.0.4
o622mci81bykwzj5ujczut3jy     slave1     Ready     Active                          25.0.4
ykwdxdwl589cxox8ffevap4hb     slave2     Ready     Active                          25.0.4
73lftyll7or01s0s0ld4urips     slave3     Ready     Active         Reachable        25.0.4

搭建完成

两个管理节点，两个工作节点

两主两从

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四、总结

1、生成主节点 init

2、加入（管理者、worker）

Docker Swarm适合构建和管理容器集群，以实现高可用性和负载均衡