Docker----DockerSwarm集群环境搭建

Docker----DockerSwarm集群环境搭建

（1）创建四个虚拟机（1核2G即可）

这里四个虚拟机ip分别为：

192.168.145.128192.168.145.129192.168.145.130192.168.145.131

（2）每个虚拟机安装docker

参照 ​​Docker----CentOS7系统上Docker的安装与卸载​​ 为四个虚拟机安装docker

（3）查看docker swarm 帮助文档

[root@localhost ~]# docker swarm --helpUsage: docker swarm COMMANDManage SwarmCommands: 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 swarmRun 'docker swarm COMMAND --help' for more information on a command.[root@localhost ~]#

（4）查看docker swarm init 的帮助文档

[root@localhost ~]# docker swarm init --helpUsage: docker swarm init [OPTIONS]Initialize a swarmOptions: --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)[root@localhost ~]#

（5）在192.168.145.128上创建一个swarm集群

[root@localhost ~]# docker swarm init --advertise-addr 192.168.145.128Swarm 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 192.168.145.128:2377To 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

[root@localhost ~]# docker node lsID HOSTNAME STATUS AVAILABILITY MANAGER STATUS ENGINE VERSIONwsqaq4isrzhlgphnnaqxucy6r * 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

[root@localhost ~]# docker swarm join-token managerTo 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

systemctl stop firewalld

如下，在192.168.145.129节点上：

[root@localhost ~]# docker swarm join --token SWMTKN-1-052n8lzu6tqwlz9osydt5ttcr268i4fxqpbgyps49nmvmh4ym6-5n9bpvj1v64wb9cvg7l2fitaj 192.168.145.128:2377This node joined a swarm as a manager.[root@localhost ~]#

如下，在192.168.145.130节点上：

[root@localhost ~]# docker swarm join --token SWMTKN-1-052n8lzu6tqwlz9osydt5ttcr268i4fxqpbgyps49nmvmh4ym6-5n9bpvj1v64wb9cvg7l2fitaj 192.168.145.128:2377This 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

[root@localhost ~]# docker node lsID HOSTNAME STATUS AVAILABILITY MANAGER STATUS ENGINE VERSIONfhpe4p0m4gb47pxh48kf9psp8 localhost.localdomain Ready Active Reachable 20.10.10p1cfiyfyxgkhupjj03tvq40ph localhost.localdomain Ready Active Reachable 20.10.10wsqaq4isrzhlgphnnaqxucy6r * 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

[root@localhost ~]# docker swarm join-token workerTo 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

[root@localhost ~]# docker swarm join --token SWMTKN-1-052n8lzu6tqwlz9osydt5ttcr268i4fxqpbgyps49nmvmh4ym6-50iq7p13l75w9oken3xqgqpnr 192.168.145.128:2377This 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，

[root@localhost ~]# docker node lsID HOSTNAME STATUS AVAILABILITY MANAGER STATUS ENGINE VERSIONfhpe4p0m4gb47pxh48kf9psp8 localhost.localdomain Ready Active Reachable 20.10.10p1cfiyfyxgkhupjj03tvq40ph localhost.localdomain Ready Active Leader 20.10.10wsqaq4isrzhlgphnnaqxucy6r * localhost.localdomain Ready Active Reachable 20.10.10xlgi99te9cchyz9n3ydkycf6k 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

[root@localhost ~]# systemctl stop dockerWarning: 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

[root@localhost ~]# docker node lsID HOSTNAME STATUS AVAILABILITY MANAGER STATUS ENGINE VERSIONfhpe4p0m4gb47pxh48kf9psp8 localhost.localdomain Ready Active Reachable 20.10.10p1cfiyfyxgkhupjj03tvq40ph localhost.localdomain Down Active Unreachable 20.10.10wsqaq4isrzhlgphnnaqxucy6r * localhost.localdomain Ready Active Leader 20.10.10xlgi99te9cchyz9n3ydkycf6k localhost.localdomain Ready Active 20.10.10[root@localhost ~]#

（15）注意点

需要注意的是，manager节点的个数必须大于等于3时才具有高可用特性，即当manager节点个数大于等于3的时候，挂掉一个节点集群是仍然能正常工作

版权声明：本文内容由网络用户投稿，版权归原作者所有，本站不拥有其著作权，亦不承担相应法律责任。如果您发现本站中有涉嫌抄袭或描述失实的内容，请联系我们jiasou666@gmail.com 处理，核实后本网站将在24小时内删除侵权内容。