deploy service on swarm
转自:https://www.cnblogs.com/jsonhc/p/7852530.html
swarm集群配置完成后,查看一些基本的信息:
[root@manager1 ~]# docker-machine ls
NAME ACTIVE DRIVER STATE URL SWARM DOCKER ERRORS
manager1 - generic Running tcp://192.168.101.14:2376 v17.09.0-ce
work1 - generic Running tcp://192.168.101.15:2376 v17.10.0-ce
查看节点信息:
[root@manager1 ~]# docker node ls
ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS
4ecjeeu8273dzsmfta7u6op9t * manager1 Ready Active Leader
sn7c5u5wtupgt3qpz22o117hl work1 Ready Active
如果需要更新详细的查看节点信息:

[root@manager1 ~]# docker node inspect --pretty manager1
ID: 4ecjeeu8273dzsmfta7u6op9t
Hostname: manager1
Joined at: 2017-11-15 18:28:21.103210247 +0000 utc
Status:
State: Ready
Availability: Active
Address: 192.168.101.14
Manager Status:
Address: 192.168.101.14:2377
Raft Status: Reachable
Leader: Yes
Platform:
Operating System: linux
Architecture: x86_64
Resources:
CPUs: 2
Memory: 3.686GiB
Plugins:
Log: awslogs, fluentd, gcplogs, gelf, journald, json-file, logentries, splunk, syslog
Network: bridge, host, macvlan, null, overlay
Volume: local
Engine Version: 17.09.0-ce
Engine Labels:
- provider=generic
TLS Info:
TrustRoot:
-----BEGIN CERTIFICATE-----
MIIBazCCARCgAwIBAgIUPDGTCzw2cZelyvysFW+jcF3PcQMwCgYIKoZIzj0EAwIw
EzERMA8GA1UEAxMIc3dhcm0tY2EwHhcNMTcxMTE1MTgyMzAwWhcNMzcxMTEwMTgy
MzAwWjATMREwDwYDVQQDEwhzd2FybS1jYTBZMBMGByqGSM49AgEGCCqGSM49AwEH
A0IABNyMg4cqG1XaXB6g5PbNGxjishle1cPF9t0kn5LbRKwh+IGwDZD2fdbli2bk
9fzVQVWCj3aZzCyyVSFxZ30+cPWjQjBAMA4GA1UdDwEB/wQEAwIBBjAPBgNVHRMB
Af8EBTADAQH/MB0GA1UdDgQWBBTElfvEWZqpfIfCYCr+Vn6peYGOPDAKBggqhkjO
PQQDAgNJADBGAiEAh44+/Ns5T+MwiD49jXmIpr7mz/8qyMEvFDtk55j5eQ0CIQCP
HEbLBRkJWxqNs6p5O+emfvIVpFHuy/X8K6tDF7qmiw==
-----END CERTIFICATE----- Issuer Subject: MBMxETAPBgNVBAMTCHN3YXJtLWNh
Issuer Public Key: MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE3IyDhyobVdpcHqDk9s0bGOKyGV7Vw8X23SSfkttErCH4gbANkPZ91uWLZuT1/NVBVYKPdpnMLLJVIXFnfT5w9Q==

现在利用docker service命令来创建服务:
[root@manager1 ~]# docker service create --name web --replicas 2 nginx
oq2jsjc4zhwtpcwqqd2whj701
Since --detach=false was not specified, tasks will be created in the background.
In a future release, --detach=false will become the default.
其中的参数:--name表示创建服务的名称,--replicas表示创建的副本数,nginx是镜像
查看创建好的service:
[root@manager1 ~]# docker service ls
ID NAME MODE REPLICAS IMAGE PORTS
oq2jsjc4zhwt web replicated 2/2 nginx:latest
查看service服务在节点的运行情况:
[root@manager1 ~]# docker service ps web
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
rk7pyq7pr49b web.1 nginx:latest work1 Running Running 7 seconds ago
w3orhk7uzvzy web.2 nginx:latest manager1 Running Running 7 seconds ago
如果在创建的过程中出现如下报错:

[root@manager1 ~]# docker service ps web
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
klcan0r46jih web.1 nginx:latest work1 Ready Preparing 3 seconds ago
ypx26zy1gp63 \_ web.1 nginx:latest work1 Shutdown Rejected 3 seconds ago "No such image: nginx:latest@s…"
dy51asan25pf web.2 nginx:latest manager1 Running Running 18 seconds ago

work1节点上没有相应的镜像,导致启动失败,可能的原因之一:work1节点使用的默认的官方镜像源,所以下载缓慢,导致失败,解决办法:将work1节点配置镜像加速器重启docker服务就行
如果需要详细查看service信息:

[root@manager1 ~]# docker service inspect --pretty web ID: oq2jsjc4zhwtpcwqqd2whj701
Name: web
Service Mode: Replicated
Replicas: 2
Placement:
UpdateConfig:
Parallelism: 1
On failure: pause
Monitoring Period: 5s
Max failure ratio: 0
Update order: stop-first
RollbackConfig:
Parallelism: 1
On failure: pause
Monitoring Period: 5s
Max failure ratio: 0
Rollback order: stop-first
ContainerSpec:
Image: nginx:latest@sha256:9fca103a62af6db7f188ac3376c60927db41f88b8d2354bf02d2290a672dc425
Resources:
Endpoint Mode: vip

如果需要访问容器提供的服务,需要为容器进行映射端口:
[root@manager1 ~]# docker service update --publish-add 8080:80 web
web
使用命令update进行对服务的修改,更新等等操作

[root@manager1 ~]# docker service ps web
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
jzq72hlu434g web.1 nginx:latest work1 Running Running less than a second ago
rk7pyq7pr49b \_ web.1 nginx:latest work1 Shutdown Shutdown 1 second ago
ys5voif2df7f web.2 nginx:latest manager1 Running Running 2 seconds ago
w3orhk7uzvzy \_ web.2 nginx:latest manager1 Shutdown Shutdown 3 seconds ago

[root@manager1 ~]# docker service ls
ID NAME MODE REPLICAS IMAGE PORTS
oq2jsjc4zhwt web replicated 2/2 nginx:latest *:8080->80/tcp
然后进行访问web服务:
这里创建的服务在节点manager1和worl1上(192.168.101.14、192.168.101.15),不指定为什么创建的service一直没有实现负载均衡,一直只是manager1节点能够提供访问,这个问题等待解决
上面可以看出service由manager1、work1两个节点提供,现在将其中的某一个节点进行下线:
[root@manager1 ~]# docker node update --availability drain work1
work1
[root@manager1 ~]# docker node ls
ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS
4ecjeeu8273dzsmfta7u6op9t * manager1 Ready Active Leader
sn7c5u5wtupgt3qpz22o117hl work1 Ready Drain
节点的availability的值可以显示节点的状态(active表示活跃在线,drain表示下线不提供服务或者处于维护状态)
将节点wrok1下线后,查看服务的replicas数量:
[root@manager1 ~]# docker service ls
ID NAME MODE REPLICAS IMAGE PORTS
oq2jsjc4zhwt web replicated 2/2 nginx:latest *:8080->80/tcp
可以看见service web的replicas并没有减少:

[root@manager1 ~]# docker service ps web
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
o0p9zt3su44g web.1 nginx:latest manager1 Running Running about a minute ago
jzq72hlu434g \_ web.1 nginx:latest work1 Shutdown Shutdown about a minute ago
rk7pyq7pr49b \_ web.1 nginx:latest work1 Shutdown Shutdown 6 minutes ago
ys5voif2df7f web.2 nginx:latest manager1 Running Running 6 minutes ago
w3orhk7uzvzy \_ web.2 nginx:latest manager1 Shutdown Shutdown 6 minutes ago

而提供服务的节点由之前的manager1和worlk1共同提供变成了只由节点manager1提供:
现在将work1节点进行更改为active:
[root@manager1 ~]# docker node update --availability active work1
work1
[root@manager1 ~]# docker node ls
ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS
4ecjeeu8273dzsmfta7u6op9t * manager1 Ready Active Leader
sn7c5u5wtupgt3qpz22o117hl work1 Ready Active
当work1节点上线后,但是work1并没有抢回提供服务:

[root@manager1 ~]# docker service ps web
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
o0p9zt3su44g web.1 nginx:latest manager1 Running Running 4 minutes ago
jzq72hlu434g \_ web.1 nginx:latest work1 Shutdown Shutdown 4 minutes ago
rk7pyq7pr49b \_ web.1 nginx:latest work1 Shutdown Shutdown 9 minutes ago
ys5voif2df7f web.2 nginx:latest manager1 Running Running 9 minutes ago
w3orhk7uzvzy \_ web.2 nginx:latest manager1 Shutdown Shutdown 9 minutes ago

现在将service的replicas进行伸缩或者扩展,这里将replicas增加到3(现在数量为2)
[root@manager1 ~]# docker service scale web=3
web scaled to 3

[root@manager1 ~]# docker service ps web
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
o0p9zt3su44g web.1 nginx:latest manager1 Running Running 6 minutes ago
jzq72hlu434g \_ web.1 nginx:latest work1 Shutdown Shutdown 6 minutes ago
rk7pyq7pr49b \_ web.1 nginx:latest work1 Shutdown Shutdown 11 minutes ago
ys5voif2df7f web.2 nginx:latest manager1 Running Running 11 minutes ago
w3orhk7uzvzy \_ web.2 nginx:latest manager1 Shutdown Shutdown 11 minutes ago
g0liotj1z9j6 web.3 nginx:latest work1 Running Running 1 second ago

可以看见work1节点又开始为web提供服务了
删除掉上面创建的服务,重新创建新的服务,使用--publish:
[root@manager1 ~]# docker service rm web
web
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