docker-compose只能在单机上使用，而stack则是swarm版本的docker-compose，二者均能使用docker-compose.yaml文件部署应用。

dockerstack常用命令

[vagrant@swarm-manager flask-redis]$ 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.

swarm stack 部署多 service 应用

先在swarm manager节点上安装一下 docker-compose

vagrant@swarm-manager:~$ sudo curl -L "https://github.com/docker/compose/releases/download/1.29.2/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
vagrant@swarm-manager:~$ sudo chmod +x /usr/local/bin/docker-compose

国内源地址：
$ sudo curl -L https://get.daocloud.io/docker/compose/releases/download/1.29.2/docker-compose-$(uname -s)-$(uname -m) -o /usr/local/bin/docker-compose

clone我们的代码仓库

vagrant@swarm-manager:~$ git clone https://github.com/insaneloafer/flask-redis
Cloning into 'flask-redis'...
remote: Enumerating objects: 22, done.
remote: Counting objects: 100% (22/22), done.
remote: Compressing objects: 100% (19/19), done.
remote: Total 22 (delta 9), reused 7 (delta 2), pack-reused 0
Unpacking objects: 100% (22/22), 8.60 KiB | 1.07 MiB/s, done.
vagrant@swarm-manager:~$ cd flask-redis
vagrant@swarm-manager:~/flask-redis$ ls
Dockerfile  LICENSE  README.md  app.py  docker-compose.yml
vagrant@swarm-manager:~/flask-redis$

环境清理

vagrant@swarm-manager:~/flask-redis$ docker system prune -a -f

镜像构建和提交， 如果你想做这一步，可以把docker-compose.yml里的 xiaopeng163/flask-redis 改成你的dockerhub id

vagrant@swarm-manager:~/flask-redis$ docker-compose build
vagrant@swarm-manager:~/flask-redis$ docker image ls
REPOSITORY                TAG          IMAGE ID       CREATED         SIZE
insaneloafer/flask-redis   latest       5efb4fcbcfc3   6 seconds ago   126MB
python                    3.9.5-slim   c71955050276   3 weeks ago     115MB

提交镜像到dockerhub

vagrant@swarm-manager:~/flask-redis$ docker login
Login with your Docker ID to push and pull images from Docker Hub. If you don't have a Docker ID, head over to https://hub.docker.com to create one.
Username: insaneloafer
Password:
WARNING! Your password will be stored unencrypted in /home/vagrant/.docker/config.json.
Configure a credential helper to remove this warning. See
https://docs.docker.com/engine/reference/commandline/login/#credentials-store

Login Succeeded
vagrant@swarm-manager:~/flask-redis$ docker-compose push
WARNING: The REDIS_PASSWORD variable is not set. Defaulting to a blank string.
Pushing flask (insaneloafer/flask-redis:latest)...
The push refers to repository [docker.io/insaneloafer/flask-redis]
f447d33c161b: Pushed
f7395da2fd9c: Pushed
5b156295b5a3: Layer already exists
115e0863702d: Layer already exists
e10857b94a57: Layer already exists
8d418cbfaf25: Layer already exists
764055ebc9a7: Layer already exists
latest: digest: sha256:c909100fda2f4160b593b4e0fb692b89046cebb909ae90546627deca9827b676 size: 1788
vagrant@swarm-manager:~/flask-redis$

通过stack启动服务

vagrant@swarm-manager:~/flask-redis$ env REDIS_PASSWORD=ABC123 docker stack deploy --compose-file docker-compose.yml flask-demo
Ignoring unsupported options: build

Creating network flask-demo_default
Creating service flask-demo_flask
Creating service flask-demo_redis-server
vagrant@swarm-manager:~/flask-redis$
vagrant@swarm-manager:~/flask-redis$ docker stack ls
NAME         SERVICES   ORCHESTRATOR
flask-demo   2          Swarm
vagrant@swarm-manager:~/flask-redis$ docker stack ps flask-demo
ID             NAME                        IMAGE                            NODE            DESIRED STATE   CURRENT STATE
ERROR     PORTS
lzm6i9inoa8e   flask-demo_flask.1          insaneloafer/flask-redis:latest   swarm-manager   Running         Running 23 seconds ago

ejojb0o5lbu0   flask-demo_redis-server.1   redis:latest                     swarm-worker2   Running         Running 21 seconds ago

vagrant@swarm-manager:~/flask-redis$ docker stack services flask-demo
ID             NAME                      MODE         REPLICAS   IMAGE                            PORTS
mpx75z1rrlwn   flask-demo_flask          replicated   1/1        insaneloafer/flask-redis:latest   *:8080->5000/tcp
z85n16zsldr1   flask-demo_redis-server   replicated   1/1        redis:latest
vagrant@swarm-manager:~/flask-redis$ docker service ls
ID             NAME                      MODE         REPLICAS   IMAGE                            PORTS
mpx75z1rrlwn   flask-demo_flask          replicated   1/1        insaneloafer/flask-redis:latest   *:8080->5000/tcp
z85n16zsldr1   flask-demo_redis-server   replicated   1/1        redis:latest
vagrant@swarm-manager:~/flask-redis$ curl 127.0.0.1:8080
Hello Container World! I have been seen 1 times and my hostname is 21d63a8bfb57.
vagrant@swarm-manager:~/flask-redis$ curl 127.0.0.1:8080
Hello Container World! I have been seen 2 times and my hostname is 21d63a8bfb57.
vagrant@swarm-manager:~/flask-redis$ curl 127.0.0.1:8080
Hello Container World! I have been seen 3 times and my hostname is 21d63a8bfb57.
vagrant@swarm-manager:~/flask-redis$

创建的网络

• docker stack使用docker-compose.yaml文件创建的是overlay网络
• docker compose使用docker-compose.yaml文件创建的是bridge网络

[vagrant@swarm-manager flask-redis]$ docker network ls
NETWORK ID     NAME                 DRIVER    SCOPE
c2531fc17c98   bridge               bridge    local
6934619098b3   docker_gwbridge      bridge    local
4cddaxhz871q   flask-demo_default   overlay   swarm
cfbe4b854234   host                 host      local
dj39uni7uy49   ingress              overlay   swarm
0ca57d809728   none                 null      local

如果docker-compose.yaml指定了bridge网络，此时此文件只能适用于开发环境的单机模式。所以最好是区分开发环境和生产环境，分别使用两个compose文件