Swarm Mode服务管理

环境准备

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[root@swarm-manager ~]# cat > ./sources.list <<END
> deb http://mirrors.aliyun.com/debian stretch main contrib non-free
> deb http://mirrors.aliyun.com/debian stretch-proposed-updates main contrib non-free
> deb http://mirrors.aliyun.com/debian stretch-updates main contrib non-free
> deb http://mirrors.aliyun.com/debian-security/ stretch/updates main non-free contrib
> END
[root@swarm-manager ~]# cat Dockerfile
FROM nginx:latest
ADD sources.list /etc/apt/sources.list
RUN apt-get update && apt-get install -y dnsutils iproute2 net-tools curl && apt-get clean
ADD index.html /usr/share/nginx/html/index.html

[root@swarm-manager ~]# echo "nginx:v1" > index.html
[root@swarm-manager ~]# docker build -t registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v1 .
[root@swarm-manager ~]# echo "nginx:v2" > index.html
[root@swarm-manager ~]# docker build -t registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v2 .

[root@swarm-manager ~]# docker push registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v1
[root@swarm-manager ~]# docker push registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v2

create

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[root@swarm-manager ~]# docker service create --name nginx registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v1
[root@swarm-manager ~]# docker service ls
ID NAME MODE REPLICAS IMAGE PORTS
63c04khgjl03 nginx replicated 1/1 registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v1
[root@swarm-manager ~]# docker service ps nginx
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
zo87xl8e3in9 nginx.1 registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v1 swarm-node1 Running Running 4 minutes ago

update

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[root@swarm-manager ~]# docker service update --network-add my-network --publish-add 80:80 nginx
[root@swarm-manager ~]# docker service ls
ID NAME MODE REPLICAS IMAGE PORTS
63c04khgjl03 nginx replicated 1/1 registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v1 *:80->80/tcp
[root@swarm-manager ~]# docker service ps nginx
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
lppql3gw8phx nginx.1 registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v1 swarm-node1 Running Running 3 minutes ago
zo87xl8e3in9 \_ nginx.1 registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v1 swarm-node1 Shutdown Shutdown 3 minutes ago

Scale

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[root@swarm-manager ~]# docker service scale nginx=2
[root@swarm-manager ~]# docker service ps nginx
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
lppql3gw8phx nginx.1 registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v1 swarm-node1 Running Running 4 minutes ago
zo87xl8e3in9 \_ nginx.1 registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v1 swarm-node1 Shutdown Shutdown 4 minutes ago
qqptr8htux76 nginx.2 registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v1 swarm-node2 Running Running 2 minutes ago

update & rollback

查看当前版本

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[root@swarm-manager ~]# curl 127.0.0.1
nginx:v1

进行rolling update

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[root@swarm-manager ~]# docker service update --image registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v2 nginx
[root@swarm-manager ~]# docker service ps nginx
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
iwpnzn3ss6uo nginx.1 registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v2 swarm-node1 Running Running 4 minutes ago
lppql3gw8phx \_ nginx.1 registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v1 swarm-node1 Shutdown Shutdown 4 minutes ago
zo87xl8e3in9 \_ nginx.1 registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v1 swarm-node1 Shutdown Shutdown 5 minutes ago
1c47y3e14dc0 nginx.2 registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v2 swarm-node2 Running Running 3 minutes ago
qqptr8htux76 \_ nginx.2 registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v1 swarm-node2 Shutdown Shutdown 3 minutes ago
[root@swarm-manager ~]# curl 127.0.0.1
nginx:v2

进行rollback

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[root@swarm-manager ~]# docker service update --rollback  nginx
nginx
[root@swarm-manager ~]# docker service ps nginx
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
xign4i5kxc0m nginx.1 registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v1 swarm-node1 Running Running 3 minutes ago
iwpnzn3ss6uo \_ nginx.1 registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v2 swarm-node1 Shutdown Shutdown 3 minutes ago
lppql3gw8phx \_ nginx.1 registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v1 swarm-node1 Shutdown Shutdown 5 minutes ago
zo87xl8e3in9 \_ nginx.1 registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v1 swarm-node1 Shutdown Shutdown 6 minutes ago
em9hv301ga5f nginx.2 registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v1 swarm-node2 Running Running 3 minutes ago
1c47y3e14dc0 \_ nginx.2 registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v2 swarm-node2 Shutdown Shutdown 3 minutes ago
qqptr8htux76 \_ nginx.2 registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v1 swarm-node2 Shutdown Shutdown 4 minutes ago
[root@swarm-manager ~]# curl 127.0.0.1
nginx:v1

healthcheck

增加健康检查

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[root@swarm-manager ~]# docker service update --health-cmd "curl -f http://localhost/ || exit 1"  nginx
[root@swarm-node1 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
f7e1935f1c22 registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v1 "nginx -g 'daemon ..." 17 seconds ago Up 12 seconds (health: starting) 80/tcp nginx.1.9dz6g3bizl4kwh8lctr552c6a
[root@swarm-node1 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
f7e1935f1c22 registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v1 "nginx -g 'daemon ..." 44 seconds ago Up 38 seconds (healthy) 80/tcp nginx.1.9dz6g3bizl4kwh8lctr552c6a

故障测试

可见当健康状态异常时,将会停止并移除掉异常的容器并重新启动一个新的容器。

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[root@swarm-node1 ~]# docker exec -it f7e1935f1c22 rm -f /usr/share/nginx/html/index.html
[root@swarm-node1 ~]# date
Wed Aug 16 16:48:41 CST 2017
[root@swarm-node1 ~]# docker events --since "2017-08-16T16:48:35"
2017-08-16T16:48:40.063995281+08:00 container exec_create: rm -f /usr/share/nginx/html/index.html f7e1935f1c2263112fe86a6e74c0d23a2ff369ffd54eab2781f2645a7dc7810a (com.docker.swarm.node.id=y83k6khc3vxmch1qd3j8kl4ak, com.docker.swarm.service.id=63c04khgjl033syhc5ef0e9g9, com.docker.swarm.service.name=nginx, com.docker.swarm.task=, com.docker.swarm.task.id=lkb6ags10aprqvzii5aht3pjf, com.docker.swarm.task.name=nginx.1.lkb6ags10aprqvzii5aht3pjf, image=registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v1@sha256:b223de06038b1187d1d1b955df759839712a10cde33d7f2784ef3f9f5573ad71, name=nginx.1.lkb6ags10aprqvzii5aht3pjf)
...
2017-08-16T16:49:57.889494869+08:00 container health_status: unhealthy f7e1935f1c2263112fe86a6e74c0d23a2ff369ffd54eab2781f2645a7dc7810a (com.docker.swarm.node.id=y83k6khc3vxmch1qd3j8kl4ak, com.docker.swarm.service.id=63c04khgjl033syhc5ef0e9g9, com.docker.swarm.service.name=nginx, com.docker.swarm.task=, com.docker.swarm.task.id=lkb6ags10aprqvzii5aht3pjf, com.docker.swarm.task.name=nginx.1.lkb6ags10aprqvzii5aht3pjf, image=registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v1@sha256:b223de06038b1187d1d1b955df759839712a10cde33d7f2784ef3f9f5573ad71, name=nginx.1.lkb6ags10aprqvzii5aht3pjf)
2017-08-16T16:49:59.891503804+08:00 container kill f7e1935f1c2263112fe86a6e74c0d23a2ff369ffd54eab2781f2645a7dc7810a (com.docker.swarm.node.id=y83k6khc3vxmch1qd3j8kl4ak, com.docker.swarm.service.id=63c04khgjl033syhc5ef0e9g9, com.docker.swarm.service.name=nginx, com.docker.swarm.task=, com.docker.swarm.task.id=lkb6ags10aprqvzii5aht3pjf, com.docker.swarm.task.name=nginx.1.lkb6ags10aprqvzii5aht3pjf, image=registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v1@sha256:b223de06038b1187d1d1b955df759839712a10cde33d7f2784ef3f9f5573ad71, name=nginx.1.lkb6ags10aprqvzii5aht3pjf, signal=15)
2017-08-16T16:49:59.964124883+08:00 container die f7e1935f1c2263112fe86a6e74c0d23a2ff369ffd54eab2781f2645a7dc7810a (com.docker.swarm.node.id=y83k6khc3vxmch1qd3j8kl4ak, com.docker.swarm.service.id=63c04khgjl033syhc5ef0e9g9, com.docker.swarm.service.name=nginx, com.docker.swarm.task=, com.docker.swarm.task.id=lkb6ags10aprqvzii5aht3pjf, com.docker.swarm.task.name=nginx.1.lkb6ags10aprqvzii5aht3pjf, exitCode=0, image=registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v1@sha256:b223de06038b1187d1d1b955df759839712a10cde33d7f2784ef3f9f5573ad71, name=nginx.1.lkb6ags10aprqvzii5aht3pjf)
2017-08-16T16:50:00.289350308+08:00 network disconnect i6xug49nwdsxauqqpli3apvym (container=f7e1935f1c2263112fe86a6e74c0d23a2ff369ffd54eab2781f2645a7dc7810a, name=ingress, type=overlay)
2017-08-16T16:50:00.289489879+08:00 network disconnect vxe1cwk14avlfp2xjgymhkhdl (container=f7e1935f1c2263112fe86a6e74c0d23a2ff369ffd54eab2781f2645a7dc7810a, name=my-network, type=overlay)
2017-08-16T16:50:00.345105732+08:00 container stop f7e1935f1c2263112fe86a6e74c0d23a2ff369ffd54eab2781f2645a7dc7810a (com.docker.swarm.node.id=y83k6khc3vxmch1qd3j8kl4ak, com.docker.swarm.service.id=63c04khgjl033syhc5ef0e9g9, com.docker.swarm.service.name=nginx, com.docker.swarm.task=, com.docker.swarm.task.id=lkb6ags10aprqvzii5aht3pjf, com.docker.swarm.task.name=nginx.1.lkb6ags10aprqvzii5aht3pjf, image=registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v1@sha256:b223de06038b1187d1d1b955df759839712a10cde33d7f2784ef3f9f5573ad71, name=nginx.1.lkb6ags10aprqvzii5aht3pjf)
2017-08-16T16:50:00.922761678+08:00 container create 2132a1bd9287bc377f0800d9a06e6876aaddb9a71b0afd567c3838fbb6aa3934 (com.docker.swarm.node.id=y83k6khc3vxmch1qd3j8kl4ak, com.docker.swarm.service.id=63c04khgjl033syhc5ef0e9g9, com.docker.swarm.service.name=nginx, com.docker.swarm.task=, com.docker.swarm.task.id=y00kqcu26sq75js3fvpqx4kt5, com.docker.swarm.task.name=nginx.1.y00kqcu26sq75js3fvpqx4kt5, image=registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v1@sha256:b223de06038b1187d1d1b955df759839712a10cde33d7f2784ef3f9f5573ad71, name=nginx.1.y00kqcu26sq75js3fvpqx4kt5)
2017-08-16T16:50:03.006063329+08:00 network destroy vxe1cwk14avlfp2xjgymhkhdl (name=my-network, type=overlay)
2017-08-16T16:50:03.376037876+08:00 container destroy 965a0ce53c2c0f2d5a740cb87c39ea51d164f1a6cf5bea0cf0679883dd99cb5c (com.docker.swarm.node.id=y83k6khc3vxmch1qd3j8kl4ak, com.docker.swarm.service.id=63c04khgjl033syhc5ef0e9g9, com.docker.swarm.service.name=nginx, com.docker.swarm.task=, com.docker.swarm.task.id=xign4i5kxc0mfp1pji7zzkoo1, com.docker.swarm.task.name=nginx.1.xign4i5kxc0mfp1pji7zzkoo1, image=registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v1@sha256:b223de06038b1187d1d1b955df759839712a10cde33d7f2784ef3f9f5573ad71, name=nginx.1.xign4i5kxc0mfp1pji7zzkoo1)
2017-08-16T16:50:05.720425867+08:00 network connect i6xug49nwdsxauqqpli3apvym (container=2132a1bd9287bc377f0800d9a06e6876aaddb9a71b0afd567c3838fbb6aa3934, name=ingress, type=overlay)
2017-08-16T16:50:05.808884815+08:00 network disconnect i6xug49nwdsxauqqpli3apvym (container=2132a1bd9287bc377f0800d9a06e6876aaddb9a71b0afd567c3838fbb6aa3934, name=ingress, type=overlay)
2017-08-16T16:50:05.919636688+08:00 network create vxe1cwk14avlfp2xjgymhkhdl (name=my-network, type=overlay)
2017-08-16T16:50:06.102359133+08:00 network connect i6xug49nwdsxauqqpli3apvym (container=2132a1bd9287bc377f0800d9a06e6876aaddb9a71b0afd567c3838fbb6aa3934, name=ingress, type=overlay)
2017-08-16T16:50:06.453151382+08:00 network connect vxe1cwk14avlfp2xjgymhkhdl (container=2132a1bd9287bc377f0800d9a06e6876aaddb9a71b0afd567c3838fbb6aa3934, name=my-network, type=overlay)
2017-08-16T16:50:07.062684099+08:00 container start 2132a1bd9287bc377f0800d9a06e6876aaddb9a71b0afd567c3838fbb6aa3934 (com.docker.swarm.node.id=y83k6khc3vxmch1qd3j8kl4ak, com.docker.swarm.service.id=63c04khgjl033syhc5ef0e9g9, com.docker.swarm.service.name=nginx, com.docker.swarm.task=, com.docker.swarm.task.id=y00kqcu26sq75js3fvpqx4kt5, com.docker.swarm.task.name=nginx.1.y00kqcu26sq75js3fvpqx4kt5, image=registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v1@sha256:b223de06038b1187d1d1b955df759839712a10cde33d7f2784ef3f9f5573ad71, name=nginx.1.y00kqcu26sq75js3fvpqx4kt5)
2017-08-16T16:51:07.221879814+08:00 container exec_create: /bin/sh -c curl -f http://localhost/ || exit 1 2132a1bd9287bc377f0800d9a06e6876aaddb9a71b0afd567c3838fbb6aa3934 (com.docker.swarm.node.id=y83k6khc3vxmch1qd3j8kl4ak, com.docker.swarm.service.id=63c04khgjl033syhc5ef0e9g9, com.docker.swarm.service.name=nginx, com.docker.swarm.task=, com.docker.swarm.task.id=y00kqcu26sq75js3fvpqx4kt5, com.docker.swarm.task.name=nginx.1.y00kqcu26sq75js3fvpqx4kt5, image=registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v1@sha256:b223de06038b1187d1d1b955df759839712a10cde33d7f2784ef3f9f5573ad71, name=nginx.1.y00kqcu26sq75js3fvpqx4kt5)
[root@swarm-node1 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
2132a1bd9287 registry.cn-hangzhou.aliyuncs.com/vnimos/nginx:v1 "nginx -g 'daemon ..." 31 minutes ago Up 30 minutes (healthy) 80/tcp nginx.1.y00kqcu26sq75js3fvpqx4kt5

constraint & placement

lable

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[root@swarm-manager ~]# docker node update --label-add project=nginx swarm-node2
[root@swarm-manager ~]# docker node update --label-add "datacenter=xiamen" swarm-node1
[root@swarm-manager ~]# docker node update --label-add "datacenter=fuzhou" swarm-node2
[root@swarm-manager ~]# docker node inspect -f {{.Spec.Labels}} swarm-node1
map[datacenter:xiamen]
[root@swarm-manager ~]# docker node inspect -f {{.Spec.Labels}} swarm-node2
map[datacenter:fuzhou project:nginx]

constraint

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[root@swarm-manager ~]# docker service create --replicas=4 --constraint 'node.hostname == swarm-node1' --name nginx-c1 nginx
[root@swarm-manager ~]# docker service create --replicas=4 --constraint 'node.labels.project == nginx' --name nginx-c2 nginx
[root@swarm-manager ~]# docker service ps nginx-c1
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
sqcyg8wm8gdt nginx-c1.1 nginx:latest swarm-node1 Running Running 5 minutes ago
ttst5umkpt6g nginx-c1.2 nginx:latest swarm-node1 Running Running 5 minutes ago
lpiz1vsaj6p3 nginx-c1.3 nginx:latest swarm-node1 Running Running 5 minutes ago
ykvrdyty4qie nginx-c1.4 nginx:latest swarm-node1 Running Running 5 minutes ago
[root@swarm-manager ~]# docker service ps nginx-c2
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
x322u16dfnyt nginx-c2.1 nginx:latest swarm-node2 Running Running 5 minutes ago
zjp93whpf4ah nginx-c2.2 nginx:latest swarm-node2 Running Running 5 minutes ago
ff3usxkpo5ae nginx-c2.3 nginx:latest swarm-node2 Running Running 5 minutes ago
p3g0haaqg6yu nginx-c2.4 nginx:latest swarm-node2 Running Running 5 minutes ago

placement

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[root@swarm-manager ~]# docker service create --replicas=6 --placement-pref 'spread=node.labels.datacenter' --name nginx-c3 nginx
[root@swarm-manager ~]# docker service ps nginx-c3
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
p3y7774kpu0w nginx-c3.1 nginx:latest swarm-node2 Running Running 3 minutes ago
081l22wh87ok nginx-c3.2 nginx:latest swarm-node1 Running Running 3 minutes ago
lj1t30mok3te nginx-c3.3 nginx:latest swarm-node1 Running Running 3 minutes ago
fhb90j6brwuv nginx-c3.4 nginx:latest swarm-node2 Running Running 3 minutes ago
ein699law198 nginx-c3.5 nginx:latest swarm-node2 Running Running 3 minutes ago
vo91976o481m nginx-c3.6 nginx:latest swarm-node1 Running Running 3 minutes ago

deploy

Docker1.13推出了一个新版本的Docker Compose(V3)。该版本的主要特征是,允许Swarm Mode使用Docker Compose文件定义直接部署服务。

定义compose-file

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[root@swarm-manager ~]# cat docker-compose.yml 
version: '3'
services:
mysql:
image: mysql
environment:
- MYSQL_ROOT_PASSWORD=password
wordpress:
image: wordpress
ports:
- 80:80
links:
- mysql:mysql
environment:
- WORDPRESS_DB_PASSWORD=password

在Swarm Mode下,需要使用docker stack deploy命令进行部署,如果直接使用docker-compose up则将会出现如下警告:

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[root@swarm-manager ~]# docker-compose up
WARNING: The Docker Engine you're using is running in swarm mode.

Compose does not use swarm mode to deploy services to multiple nodes in a swarm. All containers will be scheduled on the current node.

To deploy your application across the swarm, use `docker stack deploy`.

通过compose-file部署多个Service

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[root@swarm-manager ~]# docker stack deploy --compose-file=docker-compose.yml demo
Creating network demo_my-network
Creating service demo_mysql
Creating service demo_wordpress
[root@swarm-manager ~]# docker stack ps demo
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
5n5x8z9oso6d demo_wordpress.1 wordpress:latest swarm-node2 Running Running 3 minutes ago
66wmzw3u50i0 demo_mysql.1 mysql:latest swarm-node1 Running Running 4 minutes ago
[root@swarm-manager ~]# docker stack services demo
ID NAME MODE REPLICAS IMAGE PORTS
k791axfnh6le demo_wordpress replicated 1/1 wordpress:latest *:80->80/tcp
wp0rz1kls1m1 demo_mysql replicated 1/1 mysql:latest
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