Docker Swarm集群管理
1、创建swarm集群管理节点：可以是物理节点也可以是虚拟节点，此处以虚拟节点为例
#创建管理节点
$ docker-machine create -d virtualbox --virtualbox-no-vtx-check swarm-manager
#查看节点
$ docker-machine ls
NAME ACTIVE DRIVER STATE URL SWARM DOCKER ERRORS
swarm-manager ## virtualbox Running tcp://192.168.99.101:2376 v19.03.12
#进入管理节点
$ docker-machine ssh swarm-manager
#初始化管理节点
$ docker swarm init --advertise-addr 192.168.99.101 #这里的 IP 为创建机器时分配的 ip，或者是物理节点对外的公网ip。
Swarm initialized: current node (qjmrt0529lbkola5bsifjoh95) is now a manager.
To add a worker to this swarm, run the following command:
docker swarm join --token SWMTKN-1-66r0cbyvln0ziq05pr0e6hjcuipgs26qeh9qqwb7ab8c5ds9fb-3lptd0hxu7h7n2o59czie30yi 192.168.99.101:2377
To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.
2、创建swarm集群工作节点（worker）
$ docker-machine create -d virtualbox --virtualbox-no-vtx-check swarm-worker1
$ docker-machine create -d virtualbox --virtualbox-no-vtx-check swarm-worker2
$ docker-machine ssh swarm-worker1
#把工作节点加入到集群
docker swarm join --token SWMTKN-1-66r0cbyvln0ziq05pr0e6hjcuipgs26qeh9qqwb7ab8c5ds9fb-3lptd0hxu7h7n2o59czie30yi 192.168.99.101:2377
This node joined a swarm as a worker.
$ docker-machine ssh swarm-worker2
docker swarm join --token SWMTKN-1-66r0cbyvln0ziq05pr0e6hjcuipgs26qeh9qqwb7ab8c5ds9fb-3lptd0hxu7h7n2o59czie30yi 192.168.99.101:2377
This node joined a swarm as a worker.
3、查看集群信息
#进入管理节点
$ docker-machine ssh swarm-manager
$ docker info
。。。
Swarm: active
NodeID: qjmrt0529lbkola5bsifjoh95
Is Manager: true
ClusterID: yebdtv68qax55xkac5x41a4u8
Managers: 1
Nodes: 3
。。。
4、部署服务到集群中
docker@swarm-manager:~$ docker service create --replicas 1 --name helloworld alpine ping docker.com
zk8yud1zwu36cr0xr81varzkn
overall progress: 1 out of 1 tasks
1/1: running [==================================================>]
verify: Service converged
5、查看服务部署情况
docker@swarm-manager:~$ docker service ps helloworld
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
mlrs3lf7e824 helloworld.1 alpine:latest swarm-manager Running Running about a minute ago
6、扩展集群服务
docker@swarm-manager:~$ docker service scale helloworld=2
helloworld scaled to 2
overall progress: 2 out of 2 tasks
1/2: running [==================================================>]
2/2: running [==================================================>]
verify: Service converged
docker@swarm-manager:~$ docker service ps helloworld
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
mlrs3lf7e824 helloworld.1 alpine:latest swarm-manager Running Running 3 minutes ago
ik3k940bmr0s helloworld.2 alpine:latest swarm-worker1 Running Running 9 seconds ago
7、删除服务
docker@swarm-manager:~$ docker service rm helloworld
helloworld
8、滚动升级服务
#创建一个服务
docker@swarm-manager:~$ docker service create --replicas 1 --name redis --update-delay 10s redis:3.0.6
zkerw3p9tl0tgsonszeu4fnk1
overall progress: 1 out of 1 tasks
1/1: running [==================================================>]
verify: Service converged
docker@swarm-manager:~$ docker service ps redis
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
ylfgkptu19ty redis.1 redis:3.0.6 swarm-manager Running Running 45 seconds ago
#把服务镜像更新到新版本
docker@swarm-manager:~$ docker service update --image redis:3.0.7 redis
redis
overall progress: 1 out of 1 tasks
1/1: running [==================================================>]
verify: Service converged
#查看服务更新信息
docker@swarm-manager:~$ docker service ps redis
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
ke91k95n18em redis.1 redis:3.0.7 swarm-worker1 Running Running 48 seconds ago
uyj5ztzj6q1z \_ redis.1 redis:3.0.6 swarm-manager Shutdown Shutdown about a minute ago
9、查看所有服务
docker@swarm-manager:~$ docker service ls
ID NAME MODE REPLICAS IMAGE PORTS
a8maf209txl6 helloworld replicated 3/3 alpine:latest
zkerw3p9tl0t redis replicated 4/4 redis:3.0.7
10、把服务映射到外网可访问
- 10.1、创建overlay网络
docker@swarm-manager:~$ docker network create -d overlay imoowi 678ysjf3juarknbaqdqqnggc8 docker@swarm-manager:~$ docker network ls NETWORK ID NAME DRIVER SCOPE cb31aa0136c2 bridge bridge local a44c5e582ac9 docker_gwbridge bridge local a36b1b058d34 host host local 678ysjf3juar imoowi overlay swarm mvj08ngo9cjd ingress overlay swarm cca4329c43b1 none null local - 10.2、创建服务
docker@swarm-manager:~$ docker service create --network imoowi --name web -p 8080:80 --replicas 2 containous/whoami vw61m0fk355uz9jfcy7xiat3a overall progress: 2 out of 2 tasks 1/2: running [==================================================>] 2/2: running [==================================================>] verify: Service converged - 10.3、访问服务
simpl@yuanjun$ curl 192.168.99.102:8080 Hostname: f60e62f0d3cf IP: 127.0.0.1 IP: 10.0.0.10 IP: 172.18.0.3 IP: 10.0.1.3 RemoteAddr: 10.0.0.3:54458 GET / HTTP/1.1 Host: 192.168.99.102:8080 User-Agent: curl/7.79.1 Accept: */* simpl@yuanjun$ curl 192.168.99.103:8080 Hostname: f60e62f0d3cf IP: 127.0.0.1 IP: 10.0.0.10 IP: 172.18.0.3 IP: 10.0.1.3 RemoteAddr: 10.0.0.4:54459 GET / HTTP/1.1 Host: 192.168.99.103:8080 User-Agent: curl/7.79.1 Accept: */* simpl@yuanjun$ curl 192.168.99.104:8080 Hostname: ef36f447a444 IP: 127.0.0.1 IP: 10.0.0.11 IP: 172.18.0.3 IP: 10.0.1.4 RemoteAddr: 10.0.0.5:54460 GET / HTTP/1.1 Host: 192.168.99.104:8080 User-Agent: curl/7.79.1 Accept: */* simpl@yuanjun$ curl 192.168.99.104:8080 Hostname: f60e62f0d3cf IP: 127.0.0.1 IP: 10.0.0.10 IP: 172.18.0.3 IP: 10.0.1.3 RemoteAddr: 10.0.0.5:54462 GET / HTTP/1.1 Host: 192.168.99.104:8080 User-Agent: curl/7.79.1 Accept: */* simpl@yuanjun$ curl 192.168.99.101:8080 Hostname: ef36f447a444 IP: 127.0.0.1 IP: 10.0.0.11 IP: 172.18.0.3 IP: 10.0.1.4 RemoteAddr: 10.0.0.2:54470 GET / HTTP/1.1 Host: 192.168.99.101:8080 User-Agent: curl/7.79.1 Accept: */* #综上可以看出已经实现了负载功能
11、使用Docker Stack
- 11.1 创建compose文件,例如：docker-compose.yml
#想要在 Docker Swarm 中使用类似 Docker Compose 的能力，那么你需要使用的是 Docker Stack，它的使用方式甚至是定义方式和 Docker Compose 十分类似。
#1、创建compose文件“docker-compose.yml”
version: '3'
services:
web:
image: my-web-app:latest
ports:
- "80:80"
depends_on:
- db
- redis
deploy:
replicas: 3
update_config:
parallelism: 2
restart_policy:
condition: on-failure
db:
image: postgres:latest
volumes:
- db-data:/var/lib/postgresql/data
deploy:
placement:
constraints: [node.role == manager]
redis:
image: redis:latest
command: redis-server --requirepass ${DOCKER_PASSWORD}
volumes:
- redis-db:/data
deploy:
placement:
constraints: [node.role == manager]
volumes:
db-data:
- 11.2 部署堆栈
docker stack deploy -c docker-compose.yml myapp