Docker Swarm 服务版本更新
环境：
- 系统：Centos 7.4 x64
- 应用版本：Docker 18.09.0
- 管理节点：192.168.1.79
- 工作节点：192.168.1.78
- 工作节点：192.168.1.77
1、管理节点：创建服务设置更新策略
docker service create \
--replicas 3 \
--name redis \
--update-delay 10s \
--update-parallelism 2 \
--update-failure-action continue \
redis:3.0.6
# 创建命令
docker service create \
# 副本数
--replicas 3 \
# 服务名
--name redis \
# 设定容器间更新时间间隔
--update-delay 10s \
# 更新时同时并行更新数量，默认1
--update-parallelism 2 \
# 任务容器更新失败时的模式 continue为继续使用
--update-failure-action continue \
# 镜像
redis:3.0.6
命令解析
命令：docker service ls
ID NAME MODE REPLICAS IMAGE
v76p9bl941bk redis replicated 3/3 redis:3.0.6
查看添加服务
命令：docker service ps redis
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
2pruajw13gud redis.1 redis:3.0.6 slave02 Running Running 4 minutes ago
ma8ait8xcagl redis.2 redis:3.0.6 slave02 Running Running 4 minutes ago
igpwcuyumwzu redis.3 redis:3.0.6 slave01 Running Running 5 minutes ago
查看启动情况
2、管理节点：手动更新服务版本
docker service update --image redis:3.0.7 redis
命令：docker service ps redis
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
tio9f89x7fzk redis.1 redis:3.0.7 slave02 Running Running 2 minutes ago
2pruajw13gud \_ redis.1 redis:3.0.6 slave02 Shutdown Shutdown 2 minutes ago
e3fuv9fm202x redis.2 redis:3.0.7 slave01 Running Running 2 minutes ago
ma8ait8xcagl \_ redis.2 redis:3.0.6 slave02 Shutdown Shutdown 2 minutes ago
zku5h3h4dqkn redis.3 redis:3.0.7 slave01 Running Running 2 minutes ago
igpwcuyumwzu \_ redis.3 redis:3.0.6 slave01 Shutdown Shutdown 3 minutes ago
查看更新情况
docker service inspect redis
[
{
"ID": "v76p9bl941bk87pwwk3nvtwfe",
"Version": {
"Index": 1479
},
"CreatedAt": "2018-11-07T06:19:23.210686656Z",
"UpdatedAt": "2018-11-07T06:30:53.565888582Z",
"Spec": {
# 服务名称
"Name": "redis",
"TaskTemplate": {
"ContainerSpec": {
# 服务镜像
"Image": "redis:3.0.7@sha256:730b765df9fe96af414da64a2b67f3a5f70b8fd13a31e5096fee4807ed802e20",
"DNSConfig": {}
},
"Resources": {
"Limits": {},
"Reservations": {}
},
"RestartPolicy": {
"Condition": "any",
"MaxAttempts": 0
},
"Placement": {},
"ForceUpdate": 0
},
"Mode": {
# 模式
"Replicated": {
# 副本数
"Replicas": 3
}
},
# 服务更新时应用策略
"UpdateConfig": {
# 同时更新任务数
"Parallelism": 1,
# 更新间隔时间
"Delay": 10000000000,
# 更新失败后动作 pause暂停
"FailureAction": "pause",
# 更新失败后继续运行半分比
"MaxFailureRatio": 0
},
"EndpointSpec": {
# 默认分配1个虚拟IP
"Mode": "vip"
}
},
"PreviousSpec": {
"Name": "redis",
"TaskTemplate": {
"ContainerSpec": {
"Image": "redis:3.0.6@sha256:6a692a76c2081888b589e26e6ec835743119fe453d67ecf03df7de5b73d69842",
"DNSConfig": {}
},
"Resources": {
"Limits": {},
"Reservations": {}
},
"RestartPolicy": {
"Condition": "any",
"MaxAttempts": 0
},
"Placement": {},
"ForceUpdate": 0
},
"Mode": {
"Replicated": {
"Replicas": 3
}
},
"UpdateConfig": {
"Parallelism": 1,
"Delay": 10000000000,
"FailureAction": "pause",
"MaxFailureRatio": 0
},
"EndpointSpec": {
"Mode": "vip"
}
},
"Endpoint": {
"Spec": {}
},
"UpdateStatus": {
"State": "completed",
"StartedAt": "2018-11-07T06:29:00.44192283Z",
"CompletedAt": "2018-11-07T06:30:53.56587273Z",
"Message": "update completed"
}
}
]
查看服务详细信息
注：升级过程，按顺序停止一个容器任务去对这个停止的任务进行更新，最后更新为running状态，再继续往下更新其他容器任务，如果更新失败它会暂停更新，切换到下一个容器任务继续更新直到所有容器。
Docker Swarm 服务版本回滚
1、管理节点：创建服务时设定回滚策略
docker service create \
--name my_web \
--replicas 10 \
--rollback-parallelism 2 \
--rollback-monitor 20s \
--rollback-max-failure-ratio .2 \
nginx:1.12
# 创建服务
docker service create \
# 服务名
--name my_web \
# 副本数
--replicas 10 \
# 同时执行回滚数动作
--rollback-parallelism 2 \
# 每次容器与容器之间的回滚时间间隔
--rollback-monitor 20s \
# 回滚故障率如果小于百分比允许运行
--rollback-max-failure-ratio .2 \
# 使用镜像
nginx:1.12
命令解析
命令：docker service ps -f "DESIRED-STATE=running" my_web
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
bgqpm1s0a24l my_web.1 nginx:1.12 slave01 Running Running about a minute ago
jttvdgzpiz02 my_web.2 nginx:1.12 slave01 Running Running about a minute ago
t8yqfrzoa7fj my_web.3 nginx:1.12 slave02 Running Running about a minute ago
xgh712gi2eld my_web.4 nginx:1.12 slave02 Running Running about a minute ago
2tnw3tnofyn5 my_web.5 nginx:1.12 slave01 Running Running about a minute ago
on4khcpkb2h7 my_web.6 nginx:1.12 slave02 Running Running about a minute ago
gxdeqfbmq60k my_web.7 nginx:1.12 slave01 Running Running about a minute ago
kmyz0btgb0hk my_web.8 nginx:1.12 slave02 Running Running about a minute ago
lso2ry7f2v0o my_web.9 nginx:1.12 slave01 Running Running 2 minutes ago
ee21b2ud0mkk my_web.10 nginx:1.12 slave02 Running Running about a minute ago
查看创建服务
2、管理节点：更新服务提升一个版本
docker service update --image nginx:1.13 my_web
docker service ps -f "DESIRED-STATE=running" my_web
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
bgqpm1s0a24l my_web.1 nginx:1.13 slave01 Running Running about a minute ago
jttvdgzpiz02 my_web.2 nginx:1.13 slave01 Running Running about a minute ago
t8yqfrzoa7fj my_web.3 nginx:1.13 slave02 Running Running about a minute ago
xgh712gi2eld my_web.4 nginx:1.13 slave02 Running Running about a minute ago
2tnw3tnofyn5 my_web.5 nginx:1.13 slave01 Running Running about a minute ago
on4khcpkb2h7 my_web.6 nginx:1.13 slave02 Running Running about a minute ago
gxdeqfbmq60k my_web.7 nginx:1.13 slave01 Running Running about a minute ago
kmyz0btgb0hk my_web.8 nginx:1.13 slave02 Running Running about a minute ago
lso2ry7f2v0o my_web.9 nginx:1.13 slave01 Running Running 2 minutes ago
ee21b2ud0mkk my_web.10 nginx:1.13 slave02 Running Running about a minute ago
查看更新服务
3、管理节点：手动回滚到上一个版本
docker service update --rollback my_web
命令：docker service ls
ID NAME MODE REPLICAS IMAGE PORTS
nikder7y06o2 my_web replicated 10/10 nginx:1.12
查看回滚版本