docker swarm

[root@localhost odc]# docker swarm -h
Flag shorthand -h has been deprecated, please use --help

Usage:  docker swarm COMMAND

Manage Swarm

Commands:
  ca          Display and rotate the root CA
  init        Initialize a swarm
  join        Join a swarm as a node and/or manager
  join-token  Manage join tokens
  leave       Leave the swarm
  unlock      Unlock swarm
  unlock-key  Manage the unlock key
  update      Update the swarm

Run 'docker swarm COMMAND --help' for more information on a command.

[root@localhost odc]# docker swarm init -h
Flag shorthand -h has been deprecated, please use --help

Usage:  docker swarm init [OPTIONS]

Initialize a swarm

Options:
      --advertise-addr string           Advertised address (format: <ip|interface>[:port])
      --autolock                        Enable manager autolocking (requiring an unlock key to start a stopped manager)
      --availability string             Availability of the node ("active"|"pause"|"drain") (default "active")
      --cert-expiry duration            Validity period for node certificates (ns|us|ms|s|m|h) (default 2160h0m0s)
      --data-path-addr string           Address or interface to use for data path traffic (format: <ip|interface>)
      --dispatcher-heartbeat duration   Dispatcher heartbeat period (ns|us|ms|s|m|h) (default 5s)
      --external-ca external-ca         Specifications of one or more certificate signing endpoints
      --force-new-cluster               Force create a new cluster from current state
      --listen-addr node-addr           Listen address (format: <ip|interface>[:port]) (default 0.0.0.0:2377)
      --max-snapshots uint              Number of additional Raft snapshots to retain
      --snapshot-interval uint          Number of log entries between Raft snapshots (default 10000)
      --task-history-limit int          Task history retention limit (default 5)

[root@localhost odc]# docker node -h
Flag shorthand -h has been deprecated, please use --help

Usage:  docker node COMMAND

Manage Swarm nodes

Commands:
  demote      Demote one or more nodes from manager in the swarm
  inspect     Display detailed information on one or more nodes
  ls          List nodes in the swarm
  promote     Promote one or more nodes to manager in the swarm
  ps          List tasks running on one or more nodes, defaults to current node
  rm          Remove one or more nodes from the swarm
  update      Update a node

Run 'docker node COMMAND --help' for more information on a command.

docker swarm 创建容器

docker service create --name [容器名称] 镜像名称
docker service create --name my-tomcat tomcat

docker swarm 查看容器

docker service ps my-tomcat

查看启动日志

docker service logs  my-tomcat

添加副本

docker service scale my-tomcat=3

删除容器

docker service rm [容器名]
docker service rm my-tomcat

docker stack (类似于docker-compose,通过yml 文件启动)

[root@localhost odc]# docker stack

Usage:  docker stack [OPTIONS] COMMAND

Manage Docker stacks

Options:
      --orchestrator string   Orchestrator to use (swarm|kubernetes|all)

Commands:
  deploy      Deploy a new stack or update an existing stack
  ls          List stacks
  ps          List the tasks in the stack
  rm          Remove one or more stacks
  services    List the services in the stack

Run 'docker stack COMMAND --help' for more information on a command.

docker stack deploy -c service.yml [my-servce]

创建网络

docker network create  -d overlay my-overlay-net 

conclusion : 集群中的任意机器都能访问成功
internal 技术 ：负载均衡