本当记录按照Docker官方swarm-tutoria文档，配置和体验Docker Swarm Mode的过程。
准备
主机：
- manager1 - 192.168.61.10, CentOS7
- worker1 - 192.168.61.11, CentOS7
- worker2 - 192.168.61.12, CentOS7
Docker Engine > 1.12
开放端口2377 tcp端口, 7946 4789 tcp udp 端口
初始化集群(manager node)
在manager1上执行docker swarm init --advertise-addr 192.168.61.10命令初始化集群：
docker swarm init --advertise-addr 192.168.61.10
Swarm initialized: current node (jqcx4dbr1y00espou3mtmp6m3) is now a manager.
To add a worker to this swarm, run the following command:
docker swarm join \
--token SWMTKN-1-55deh9541886sn6qsnwa2xq62f0s8k5urdbje8sqerhmb0b33e-8cgailtk9yzt7am7gfjh64foc \
192.168.61.10:2377
To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.当前节点被切换成swarm模式，同时作为集群的manager节点。集群中的其他节点通过advertise-addr访问manager节点。使用docker info查看swarm状态：
docker info
Containers: 1
Running: 0
Paused: 0
Stopped: 1
Images: 1
Server Version: 1.13.1
Storage Driver: overlay
Backing Filesystem: xfs
Supports d_type: false
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
Volume: local
Network: bridge host macvlan null overlay
Swarm: active
NodeID: jqcx4dbr1y00espou3mtmp6m3
Is Manager: true
ClusterID: xk0l7eskn1116n9xv4h0romgp
Managers: 1
Nodes: 1
Orchestration:
Task History Retention Limit: 5
Raft:
Snapshot Interval: 10000
Number of Old Snapshots to Retain: 0
Heartbeat Tick: 1
Election Tick: 3
Dispatcher:
Heartbeat Period: 5 seconds
CA Configuration:
Expiry Duration: 3 months
Node Address: 192.168.61.10
Manager Addresses:
192.168.61.10:2377
Runtimes: runc
.......使用docker node ls查看swarm的节点信息：
docker node ls
ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS
jqcx4dbr1y00espou3mtmp6m3 * manager1 Ready Active Leader需要重新初始化集群时，可以在manager1节点执行
docker swarm leave --force
添加节点(worker node)
下面将worker1和worker2添加到swarm中,分别在worker1和worker2上执行：
docker swarm join \
--token SWMTKN-1-55deh9541886sn6qsnwa2xq62f0s8k5urdbje8sqerhmb0b33e-8cgailtk9yzt7am7gfjh64foc \
192.168.61.10:2377
This node joined a swarm as a worker.在manager1上查看swarm的节点信息：
docker node ls
ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS
40n3cemzy0e61tg0xngbnmavw workder2 Ready Active
jqcx4dbr1y00espou3mtmp6m3 * manager1 Ready Active Leader
zicuzcgvcaylyozivhap3h10e worker1 Ready Active部署service
创建服务
在manager1上执行：
docker service create --replicas 1 --name helloworld alpine ping docker.comdocker service ls
ID NAME MODE REPLICAS IMAGE
d15yu9fp6uan helloworld replicated 1/1 alpine:latest
docker service inspect --pretty helloworld
ID: d15yu9fp6uangvc42e3cvfz90
Name: helloworld
Service Mode: Replicated
Replicas: 1
Placement:
UpdateConfig:
Parallelism: 1
On failure: pause
Max failure ratio: 0
ContainerSpec:
Image: alpine:latest@sha256:dfbd4a3a8ebca874ebd2474f044a0b33600d4523d03b0df76e5c5986cb02d7e8
Args: ping docker.com
Resources:
Endpoint Mode: vipdocker service ps helloworld
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
v7rz1q3jbd60 helloworld.1 alpine:latest manager1 Running Running 2 minutes ago服务扩容
docker service scale helloworld=5
helloworld scaled to 5
docker service ps helloworld
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
v7rz1q3jbd60 helloworld.1 alpine:latest manager1 Running Running 3 minutes ago
t0bueqxz59gh helloworld.2 alpine:latest workder2 Running Preparing 13 seconds ago
g9e0cxaus7ue helloworld.3 alpine:latest workder2 Running Preparing 13 seconds ago
qr3r6jxuib2v helloworld.4 alpine:latest manager1 Running Running 12 seconds ago
8y1rmhbnsaeu helloworld.5 alpine:latest worker1 Running Running 1 second ago删除服务
docker service rm helloworld滚动升级
docker service create \
--replicas 3 \
--name redis \
--update-delay 10s \
redis:3.0.6
docker service update --image redis:3.0.7 redis
docker service ps redisdrain node
docker service ps helloworld
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
jkadvsdxt0u4 helloworld.1 alpine:latest worker1 Running Running 27 seconds ago
tq1d6puxllim helloworld.2 alpine:latest worker1 Running Running 18 seconds ago
qokx1nezzs9w helloworld.3 alpine:latest workder2 Running Running 18 seconds ago
p6aeuvxa62y1 helloworld.4 alpine:latest manager1 Running Running 18 seconds ago
l7o1jutyitjj helloworld.5 alpine:latest manager1 Running Running 18 seconds agodocker node update --availability drain worker1
docker node inspect --pretty worker1
ID: zicuzcgvcaylyozivhap3h10e
Hostname: worker1
Joined at: 2017-02-25 11:20:45.483139499 +0000 utc
Status:
State: Ready
Availability: Drain
Address: 192.168.61.11
docker service ps helloworld
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
ibwak6db70vj helloworld.1 alpine:latest workder2 Running Running 16 seconds ago
jkadvsdxt0u4 \_ helloworld.1 alpine:latest worker1 Shutdown Shutdown 17 seconds ago
aslp4gfmwpx3 helloworld.2 alpine:latest workder2 Running Running 16 seconds ago
tq1d6puxllim \_ helloworld.2 alpine:latest worker1 Shutdown Shutdown 17 seconds ago
qokx1nezzs9w helloworld.3 alpine:latest workder2 Running Running 2 minutes ago
p6aeuvxa62y1 helloworld.4 alpine:latest manager1 Running Running 2 minutes ago
l7o1jutyitjj helloworld.5 alpine:latest manager1 Running Running 2 minutes ago
docker node update --availability active worker1
docker node inspect --pretty worker1
ID: zicuzcgvcaylyozivhap3h10e
Hostname: worker1
Joined at: 2017-02-25 11:20:45.483139499 +0000 utc
Status:
State: Ready
Availability: Active
Address: 192.168.61.11docker swam命令
- docker swarm - 集群管理, 子命令有init, join,join-token, leave, update
- docker node - 节点管理, 子命令有demote, inspect,ls, promote, rm, ps, update
- docker service - 服务管理, 子命令有create, inspect, ps, ls ,rm , scale, update
- docker stack - 用于应用部署,子命令有deploy, ls, ps, rm, services