英文:
Docker HEALTHCHECK CMD won't return success even with "exit 0"
问题
问题就在标题上。我正在尝试设置健康检查，但无论我在参数数组中放什么，HEALTHCHECK 都会失败。
[ "exit 0"], [ "CMD", "exit 0" ], [ "CMD-SHELL", "exit 0" ]，什么都不管用。
容器始终标记为不健康。
这是我在 Dockerfile 中的完整命令。
HEALTHCHECK --interval=30s --timeout=10s --start-period=1m --retries=3 CMD [ "CMD-SHELL", "/healthcheck.sh" ]
我确认在容器上运行以下命令返回 0。
> /healthcheck.sh && echo $? > 0
这产生了相同的结果，尽管这并不重要。
> /bin/sh /healthcheck.sh && echo $? > 0
我的 /healcheck.sh 脚本非常简单。
#!/bin/sh
tile38-cli HEALTHZ | grep -q true
RESULT=$?
echo "health check exited with status $RESULT"
exit $RESULT
怎么回事？
英文:
The question is in the title. I am attempting to setup health checks but the HEALTCHECK is always failing no matter what i put in for the args array.
[ "exit 0"], [ "CMD", "exit 0" ], [ "CMD-SHELL", "exit 0" ], nothing works.
The container is always marked as unhealthy.
Here is my full command from the Dockerfile.
HEALTHCHECK --interval=30s --timeout=10s --start-period=1m --retries=3 CMD [ "CMD-SHELL", "/healthcheck.sh" ]
I've confirmed running a the folowing on the container returns 0.
> /healthcheck.sh && echo $?
> 0
This has the same result, not that it matters.
> /bin/sh /healthcheck.sh && echo $?
> 0
My /healcheck.sh script is dead simple.
#!/bin/sh
tile38-cli HEALTHZ | grep -q true
RESULT=$?
echo "health check exited with status $RESULT"
exit $RESULT
What gives?
答案1
得分: 0
当我使用[]来指定命令时，原来它使用默认的SHELL，在Linux上是/bin/sh -c。这意味着它试图将我的脚本作为原始命令执行，而不是作为脚本。
解决方案是移除[]。
HEALTHCHECK CMD /app/healthcheck.sh || exit 1
英文:
Turns out, when i specify the command with [] that specifies that it uses the default SHELL which on Linux is /bin/sh -c. This means its trying to execute my script as a raw command, not a script.
The solution is to remove the [].
HEALTHCHECK CMD /app/healthcheck.sh || exit 1
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