初始化叢集（在第一個管理節點操作）

docker swarm init --advertise-addr <first_manager_node_ip>

部分輸出資訊：

Swarm initialized: current node (mo2p7vnjhzg68g6wzejozdomo) is now a manager.

To add a worker to this swarm, run the following command:

    docker swarm join --token SWMTKN-1-260gjixktxw5jnso7osrpuhsvqi33m2ksro78doxlqanug9kix-141p1sm3ugjsw4qh6o0ydp2ho <first_manager_node_ip>:2377    ## 此命令新增worker節點

To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.    ## 此方法可獲取新增備用manager節點的命令，生產環境必須至少三個manager節點
 

後面可以使用以下命令獲取加入其他節點的命令：

docker swarm join-token manager
docker swarm join-token worker

叢集節點之間開啟協議和埠說明：

TCP port 2377 for cluster management communications
TCP and UDP port 7946 for communication among nodes
UDP port 4789 for overlay network traffic

檢視叢集狀態：

docker info
docker node ls

部署一個服務（必須在管理節點操作）

部署命令：

# docker service create --replicas 1 --name helloworld alpine ping docker.com

命令說明：

The docker service create command creates the service.
The --name flag names the service helloworld.
The --replicas flag specifies the desired state of 1 running instance.
The arguments alpine ping docker.com define the service as an Alpine Linux container that executes the command ping docker.com.
 

檢視服務：

# docker service ls

ID                  NAME                MODE                REPLICAS            IMAGE               PORTS
9wquw4g6bt29        helloworld          replicated          1/1                 alpine:latest

# docker service inspect --pretty helloworld

ID:             9wquw4g6bt29yl213t4pg9spq
Name:           helloworld
Service Mode:   Replicated
 Replicas:      1
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:         alpine:latest@sha256:7df6db5aa61ae9480f52f0b3a06a140ab98d427f86d8d5de0bedab9b8df6b1c0
 Args:          ping docker.com 
Resources:
Endpoint Mode:  vip

# docker service ps helloworld

ID                  NAME                IMAGE               NODE                DESIRED STATE       CURRENT STATE            ERROR               PORTS
f5tbcczzpy40        helloworld.1        alpine:latest       mysqlmaster         Running             Running 34 minutes ago

擴容服務：

# docker service scale helloworld=3

helloworld scaled to 3
overall progress: 3 out of 3 tasks 
1/3: running   [==================================================>] 
2/3: running   [==================================================>] 
3/3: running   [==================================================>] 
verify: Service converged

# docker service ps helloworld

ID                  NAME                IMAGE               NODE                DESIRED STATE       CURRENT STATE            ERROR               PORTS
f5tbcczzpy40        helloworld.1        alpine:latest       mysqlmaster         Running             Running 40 minutes ago                       
pbx26pn67shp        helloworld.2        alpine:latest       mysqlmaster         Running             Running 20 seconds ago                       
d7k1txanj0d2        helloworld.3        alpine:latest       mysqlslave          Running             Running 20 seconds ago

刪除服務：

# docker service rm helloworld