如何检查Docker引擎和Docker容器是否正在运行? [英] How to check if the docker engine and a docker container are running?

问题描述

在脚本中，我需要检查:

In a script, I need to check:

a)泊坞窗引擎正在运行吗?
b)给定一个容器名称，该docker容器是否正在运行?

a) Is the docker engine running?
b) Given a container name, is that docker container running?

[此问题的最初措词不明确，有些人将其解释为"check docker engine"，而另一些人则将其解释为"check docker container"]

推荐答案

如果您正在寻找特定的容器，则可以运行:

If you are looking for a specific container, you can run:

if [ "$( docker container inspect -f '{{.State.Running}}' $container_name )" == "true" ]; then ...

为避免处于崩溃循环并不断重启的容器出现问题，可以通过检查 Status 字段来改善上述情况:

To avoid issues with a container that is in a crash loop and constantly restarting from showing that it's up, the above can be improved by checking the Status field:

if [ "$( docker container inspect -f '{{.State.Status}}' $container_name )" == "running" ]; then ...

如果您想知道dockerd是否正在本地计算机上运行并且已经安装了systemd，则可以运行:

If you want to know if dockerd is running itself on the local machine and you have systemd installed, you can run:

systemctl show --property ActiveState docker

您还可以使用 docker info 或 docker version 连接到docker，如果守护程序不可用，它们将出错.

You can also connect to docker with docker info or docker version and they will error out if the daemon is unavailable.

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