如何使用 docker-compose 使用特定错误代码退出 docker 容器？

Question

我可以用 docker-compose 启动一个 Docker 容器，并用这个例子检查它的退出代码：

# Dockerfile
FROM alpine:3.15 as base

# docker-compose.yml
version: '3.6'
services:
  dummy:
    build:
      context: .
    entrypoint: ["sleep", "42"]
    image: "tmp:tmp"

$ docker-compose up --force-recreate
WARNING: The Docker Engine you're using is running in swarm mode.

Compose does not use swarm mode to deploy services to multiple nodes in a swarm. All containers will be scheduled on the current node.

To deploy your application across the swarm, use `docker stack deploy`.

Recreating docker-compose_dummy_1 ... done
Attaching to docker-compose_dummy_1
docker-compose_dummy_1 exited with code 0
$ docker inspect docker-compose_dummy_1 --format='{{.State.ExitCode}}' # 42 seconds later
0

有没有办法让这个容器以特定的错误代码退出？
我希望我的 docker inspect 到 return 的结果可以在我的 docker-compose.yml.

中指定一个非零值

我天真地认为将入口点从 sleep 更改为 exit 应该可行：

# docker-compose.yml
version: '3.6'
services:
  dummy:
    build:
      context: .
    entrypoint: ["exit", "42"]
    image: "tmp:tmp"

...但它没有：

$ docker-compose up --force-recreate
WARNING: The Docker Engine you're using is running in swarm mode.

Compose does not use swarm mode to deploy services to multiple nodes in a swarm. All containers will be scheduled on the current node.

To deploy your application across the swarm, use `docker stack deploy`.

Recreating docker-compose_dummy_1 ... error

ERROR: for docker-compose_dummy_1  Cannot start service dummy: OCI runtime create failed: container_linux.go:345: starting container process caused "exec: \"exit\": executable file not found in $PATH": unknown

ERROR: for dummy  Cannot start service dummy: OCI runtime create failed: container_linux.go:345: starting container process caused "exec: \"exit\": executable file not found in $PATH": unknown
ERROR: Encountered errors while bringing up the project.

Answer 1

仔细查看您的错误消息：

ERROR: for docker-compose_dummy_1  Cannot start service dummy: OCI
runtime create failed: container_linux.go:345: starting container
process caused "exec: \"exit\": executable file not found in $PATH":
unknown

当您指定像 ["exit", "42"] 这样的入口点时，它不会在 shell 中执行。 Docker 正在您的 $PATH 中寻找名为 exit 的命令，当然不存在这样的命令。

您需要运行您的命令在 shell 中，因为 exit 是一个 shell 命令：

    entrypoint: ["/bin/sh", "-c", "exit 42"]

如何使用 docker-compose 使用特定错误代码退出 docker 容器？

How to make a docker container exit with a specific error-code with docker-compose?

docker

docker-compose

exit

exit-code

docker-container