[Docker Swarm集群+图形化界面Visualizer笔记记录]
2024-04-15 23:35:50
一、Docker Swarm简介
Docker Swarm介绍
上面的链接是Docker Swarm官方文档介绍
二、创建Docker Swarm
1. 环境准备
| 系统版本 | docker版本 | hostname | ip地址 |
| Ubuntu 20.04.02 | 20.10.12 | docker-swarm-manager | 192.168.100.10 |
| docker-swarm-node1 | 192.168.100.11 | ||
| docker-swarm-node2 | 192.168.100.12 | ||
| docker-swarm-node3 | 192.168.100.13 |
2. 主机群的设置
- 用于群集管理通信的TCP 端口 2377
- TCP和UDP 端口 7946，用于节点之间的通信
- 用于覆盖网络流量的UDP 端口 4789
3. 初始化Swarm
1. 创建新的群
docker swarm init --advertise-addr 192.168.100.10:2377
Swarm initialized: current node (pi68on0hdlfghbt0aqi7hssfr) is now a manager.To add a worker to this swarm, run the following command:docker swarm join --token SWMTKN-1-5ntm061z0zqeti3d7leo1470kti1397haq7dbwdwzysxz8r70q-8itm8rifkjh0j8we0dasf8cqv 192.168.100.10:2377To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.2. 检查swarm的状态
docker info
...snip...
Swarm: activeNodeID: pi68on0hdlfghbt0aqi7hssfrIs Manager: trueClusterID: iqd9k1j8pm32vvmrh1yai5xv2Managers: 1Nodes: 13. 查看相关节点状态
docker node ls
ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS ENGINE VERSION
pi68on0hdlfghbt0aqi7hssfr * docker-swarm-manager Ready Active Leader 20.10.124. 加入节点
1. 如果忘记了join的token，可以在manager上运行以下命令
docker swarm jion-token worker
To add a worker to this swarm, run the following command:docker swarm join --token SWMTKN-1-5ntm061z0zqeti3d7leo1470kti1397haq7dbwdwzysxz8r70q-8itm8rifkjh0j8we0dasf8cqv 192.168.100.10:23772. 打开node1的终端或者通过SSH远程连接并加入swarm
docker swarm join \--token SWMTKN-1-5ntm061z0zqeti3d7leo1470kti1397haq7dbwdwzysxz8r70q-8itm8rifkjh0j8we0dasf8cqv \192.168.100.10:2377This node joined a swarm as a worker.3. 在manager端检查node状态
docker node ls
ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS ENGINE VERSION
pi68on0hdlfghbt0aqi7hssfr * docker-swarm-manager Ready Active Leader 20.10.12
9wl85wofncens0op1fht44onh docker-swarm-node1 Ready Active 20.10.124. 然后在node2和node3上以此类推最终达到以下状态
docker node ls
ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS ENGINE VERSION
pi68on0hdlfghbt0aqi7hssfr * docker-swarm-manager Ready Active Leader 20.10.12
9wl85wofncens0op1fht44onh docker-swarm-node1 Ready Active 20.10.12
wx8o91l3iphjpp6sifwa3t67n docker-swarm-node2 Ready Active 20.10.12
vt61077ko09lvpfgg80wa6sa5 docker-swarm-node3 Ready Active 20.10.12三、创建图形化UI-Visualizer
1. 直接部署Visualizer容器-开放8080端口,如果端口被占用自行更换其他端口
docker run -d -p 8080:8080 -e HOST=172.16.0.10 -e PORT=8080 \
-v /var/run/docker.sock:/var/run/docker.sock \
--name visualizer dockersamples/visualizer
//-e HOST指定的是容器2. 打开Visualizer网站
http://192.168.100.10:8080
确认1个Manager和3个Worker都正常显示
四、部署服务
1. 创建一个服务
docker service create --replicas 8 --name web -p 80:80 nginx
mvtevaaz4gns1to94xcmcg44s
overall progress: 8 out of 8 tasks
1/8: running [==================================================>]
2/8: running [==================================================>]
3/8: running [==================================================>]
4/8: running [==================================================>]
5/8: running [==================================================>]
6/8: running [==================================================>]
7/8: running [==================================================>]
8/8: running [==================================================>]
verify: Service converged 创建服务命令docker service create
标志服务名称 --name web
指定8个实例运行所需的状态 --replicas 8, 一个实例就是一个容器
将服务定义为执行nginx(80端口)容器:-p 80:80 nginx
2. 检查服务
Manager节点
docker service ls
ID NAME MODE REPLICAS IMAGE PORTS
mvtevaaz4gns web replicated 8/8 nginx:latest *:80->80/tcpdocker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
b01461d7d65f nginx:latest "/docker-entrypoint.…" 3 minutes ago Up 3 minutes 80/tcp web.3.jastpsuzc79xxvucx17rfsb9q
410b4a32b2f7 nginx:latest "/docker-entrypoint.…" 3 minutes ago Up 3 minutes 80/tcp web.7.pr506t1svbnfsp56gnn4p4g7dnode1节点(node2,node3以此类推)
docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
4c645bf8f22e nginx:latest "/docker-entrypoint.…" 3 minutes ago Up 3 minutes 80/tcp web.2.lqqr8o8qc74vtxodc2xiyklme
aa5298c9bdab nginx:latest "/docker-entrypoint.…" 3 minutes ago Up 3 minutes 80/tcp web.6.x7k5rpxnd8lrt3iqgbsnurcwd图形化界面
确认图形化界面当中的CONTAINER ID和命令查看一致
docker service ps web
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
bswlg5zgveyo web.1 nginx:latest docker-swarm-node2 Running Running 11 minutes ago
lqqr8o8qc74v web.2 nginx:latest docker-swarm-node1 Running Running 11 minutes ago
jastpsuzc79x web.3 nginx:latest docker-swarm-manager Running Running 11 minutes ago
yi4zi4dwcwbu web.4 nginx:latest docker-swarm-node3 Running Running 11 minutes ago
sdd1qk04o26i web.5 nginx:latest docker-swarm-node2 Running Running 11 minutes ago
x7k5rpxnd8lr web.6 nginx:latest docker-swarm-node1 Running Running 11 minutes ago
pr506t1svbnf web.7 nginx:latest docker-swarm-manager Running Running 11 minutes ago
l5t467cpy3j5 web.8 nginx:latest docker-swarm-node3 Running Running 11 minutes ago3. 将副本数量增加或减少
docker service scale web=5
web scaled to 5
overall progress: 5 out of 5 tasks
1/5: running [==================================================>]
2/5: running [==================================================>]
3/5: running [==================================================>]
4/5: running [==================================================>]
5/5: running [==================================================>]scale数量大于当前则为增加，少于当前则为减少，示例中为减少
docker service ps web
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
bswlg5zgveyo web.1 nginx:latest docker-swarm-node2 Running Running 16 minutes ago
lqqr8o8qc74v web.2 nginx:latest docker-swarm-node1 Running Running 16 minutes ago
jastpsuzc79x web.3 nginx:latest docker-swarm-manager Running Running 16 minutes ago
yi4zi4dwcwbu web.4 nginx:latest docker-swarm-node3 Running Running 16 minutes ago
sdd1qk04o26i web.5 nginx:latest docker-swarm-node2 Running Running 16 minutes ago 图形化界面显示
4. 设置Manager节点不运行容器，如果要drain一个node，只需输入node名替换manager即可
docker node update --availability drain docker-swarm-manager
docker-swarm-managerdocker service ps web
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
bswlg5zgveyo web.1 nginx:latest docker-swarm-node2 Running Running 23 minutes ago
lqqr8o8qc74v web.2 nginx:latest docker-swarm-node1 Running Running 23 minutes ago
3ccpb8wnkkpj web.3 nginx:latest docker-swarm-node1 Running Running 34 seconds ago
jastpsuzc79x \_ web.3 nginx:latest docker-swarm-manager Shutdown Shutdown 35 seconds ago
yi4zi4dwcwbu web.4 nginx:latest docker-swarm-node3 Running Running 22 minutes ago
sdd1qk04o26i web.5 nginx:latest docker-swarm-node2 Running Running 23 minutes ago //设置manager以后不运行容器，但已经运行的容器并不会停止
// --availability：选项后面共有三个选项可配置，如下：
active：工作；pause：暂时不工作；drain：永久性的不工作
此处manager上的节点shutdown，并且转移到node1节点，图形化界面如下
5. 恢复manager节点可以运行容器
docker node update --availability active docker-swarm-manager
docker-swarm-managerdocker service ps web
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
bswlg5zgveyo web.1 nginx:latest docker-swarm-node2 Running Running 23 minutes ago
lqqr8o8qc74v web.2 nginx:latest docker-swarm-node1 Running Running 23 minutes ago
3ccpb8wnkkpj web.3 nginx:latest docker-swarm-node1 Running Running 34 seconds ago
jastpsuzc79x \_ web.3 nginx:latest docker-swarm-manager Shutdown Shutdown 35 seconds ago
yi4zi4dwcwbu web.4 nginx:latest docker-swarm-node3 Running Running 22 minutes ago
sdd1qk04o26i web.5 nginx:latest docker-swarm-node2 Running Running 23 minutes ago 如图所示，发现恢复了之后，node1节点的web.3也不会转移回manager节点，这个时候需要重新Scale一下服务
docker service scale web=8
web scaled to 8
overall progress: 8 out of 8 tasks
1/8: running [==================================================>]
2/8: running [==================================================>]
3/8: running [==================================================>]
4/8: running [==================================================>]
5/8: running [==================================================>]
6/8: running [==================================================>]
7/8: running [==================================================>]
8/8: running [==================================================>]
verify: Service converged查看服务，会发现manager节点重新运行容器，但是之前的web.3不会再恢复了
docker service ps web
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
bswlg5zgveyo web.1 nginx:latest docker-swarm-node2 Running Running 32 minutes ago
lqqr8o8qc74v web.2 nginx:latest docker-swarm-node1 Running Running 32 minutes ago
3ccpb8wnkkpj web.3 nginx:latest docker-swarm-node1 Running Running 9 minutes ago
jastpsuzc79x \_ web.3 nginx:latest docker-swarm-manager Shutdown Shutdown 9 minutes ago
yi4zi4dwcwbu web.4 nginx:latest docker-swarm-node3 Running Running 32 minutes ago
sdd1qk04o26i web.5 nginx:latest docker-swarm-node2 Running Running 32 minutes ago
83t42vs4ok1m web.6 nginx:latest docker-swarm-manager Running Running about a minute ago
5bam3kkyqfst web.7 nginx:latest docker-swarm-node3 Running Running about a minute ago
xam0e6o28kaq web.8 nginx:latest docker-swarm-manager Running Running about a minute ago 图形化界面显示如下
6. 将node1节点的Docker Service Stop
systemctl stop docker
Warning: Stopping docker.service, but it can still be activated by:docker.socket打开图形化界面检查node1节点的服务，变成红色，且服务转移到Maneger和Node3节点
恢复node1节点的docker服务
systemctl start docker检查图形化界面，会发现该节点已恢复，但是服务并未在node1节点重新启动，如果想恢复和之前drain一样重新scale一下服务即可
7. 同时部署两个服务(部署前已将之前服务删除)
docker service create --replicas 4 --name web -p 80:80 nginx
krnna254c80y9qnzpalgegqcf
overall progress: 4 out of 4 tasks
1/4: running [==================================================>]
2/4: running [==================================================>]
3/4: running [==================================================>]
4/4: running [==================================================>]
verify: Service convergeddocker service create --replicas 4 --name helloworld alpine ping docker.com
pyu39oz1zvtg8hjvtuhvtc1lv
overall progress: 4 out of 4 tasks
1/4: running [==================================================>]
2/4: running [==================================================>]
3/4: running [==================================================>]
4/4: running [==================================================>]
verify: Service converged 图形化界面显示
这里就不去单独节点查看服务了，有兴趣的可以自行查看
五、删除服务
查看当前node2节点运行的容器信息如下
docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
ad971edaf5b5 nginx:latest "/docker-entrypoint.…" 43 minutes ago Up 43 minutes 80/tcp web.1.bswlg5zgveyotosf344xt8jul
2f03bc1777d6 nginx:latest "/docker-entrypoint.…" 43 minutes ago Up 43 minutes 80/tcp web.5.sdd1qk04o26if40msv77yxbgd删除Manager节点的服务
docker service rm web
webdocker service ls
ID NAME MODE REPLICAS IMAGE PORTSdocker service ps web
no such service: webdocker service rm helloworld
helloworlddocker service ls
ID NAME MODE REPLICAS IMAGE PORTSdocker service ps helloworld
no such service: helloworld重新检查node2运行的容器情况，容器已消失
docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES图形化界面如下，和初始登陆网站没有任何服务运行一致
六、删除Node节点，退出Swarm
node1节点申请离开swarm群
docker swarm leave
Node left the swarm.manager查看当前node状态，确认node1状态为Down
docker node ls
ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS ENGINE VERSION
pi68on0hdlfghbt0aqi7hssfr * docker-swarm-manager Ready Active Leader 20.10.12
9wl85wofncens0op1fht44onh docker-swarm-node1 Down Active 20.10.12
wx8o91l3iphjpp6sifwa3t67n docker-swarm-node2 Ready Active 20.10.12
vt61077ko09lvpfgg80wa6sa5 docker-swarm-node3 Ready Active 20.10.12删除node1节点
docker node rm docker-swarm-node1
docker-swarm-node1docker node ls
ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS ENGINE VERSION
pi68on0hdlfghbt0aqi7hssfr * docker-swarm-manager Ready Active Leader 20.10.12
wx8o91l3iphjpp6sifwa3t67n docker-swarm-node2 Ready Active 20.10.12
vt61077ko09lvpfgg80wa6sa5 docker-swarm-node3 Ready Active 20.10.12删除运行中的节点
docker node rm docker-swarm-node2
Error response from daemon: rpc error: code = FailedPrecondition desc = node wx8o91l3iphjpp6sifwa3t67n is not down and can't be removed以此类推删除所有节点之后，manager申请退出集群
docker swarm leave --force
Node left the swarm.docker node ls
Error response from daemon: This node is not a swarm manager. Use "docker swarm init" or "docker swarm join" to connect this node to swarm and try again.再打打开图形化界面发现整个swarm集群已消失
PS: 官网还有很多其他内容，比如docker swarm --autolock等等，有兴趣的可以仔细研究
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