Nginx Docker Continuing to Exit Code 1
"Docker exit code 1" is a Docker error that may stop you from continuing your development further. In this Quick Fix part, we will discuss where this error message comes from, and how you can fix it quickly and easily!
What does "Docker exit code 1" mean
Docker exiting with an exit code 1 usually means that the container stopped working due to either an error within the application or an incorrect Dockerfile/Docker-compose file.
An application error can indicate something as simple as missing a quote, or diving by zero, but it can also be something that's a huge and complex issue within our application.
An incorrect Dockerfile/Docker-compose can indicate that we forgot to put a brace somewhere, comma, or simply references some variable or file that does not exist.
How to confirm that the "Docker exit code 1" error occurred?
Docker has way more exit codes than a single one, there's not an official list, unfortunately, at least not a one that I could find. Maybe you'll be able to find them all on the official Docker documentation here.
We'll be using a few commands to confirm that our actual issue is the "Docker exit code 1" and nothing else. Starting with the docker "up & running status" and list of all running service docker ps, we'll need to filter it through, and thus we need to use the —filter the final command should look something like this.
docker ps --filter "status=exited" We can also do something similar but get it for a specific container that we know the id of. The command would look something like this then
docker inspect <container-id> --format='{{.State.ExitCode}}' Or we can look them up by a name like this
docker ps -a | grep container-name Fixing the "Docker exit code 1"
As said earlier, the error occurs when your application has an internal error, or when the Dockerfile or docker-compose has a typo inside (or an outdated syntax for example)
The error itself does not tell us anything more though, don't worry though, because while it may sound bad, there is a way to check what really happened within our application. To do so, we can use the docker logs command to see all of the errors and their details. We can also start the container without the -d parameter, to see why the container has crashed.
There should be stated on what line our Dockerfile or docker-compose is invalid. Or at least that the application has crashed due to an internal error within our application.
Fixing the typo in either of the files
Fixing the typo should be pretty easy, especially if you have an IDE that supports Docker and Docker Compose files. The IDE should notify you that something's wrong and that the file/variable does not exist or the syntax is incorrect.
An example of this would be mistyping WORKDIR to WOKDIR.
It's underlined in red color as you can see.
Fixing the internal application error
This part is a bit more on your side, as there's no way Docker can actually recognize what's the issue of your application, nor can your IDE.
Well sure, your IDE can tell you some syntax issues, but it has no way of knowing what's actually messed up.
I'd recommend you first browse the logs of your application, then resort to annoying the living soul out of any programmer that's close to you to fix the issue for you.
It should be running just like a charm after you fix the internal errors though.
Summary
The "Docker exit code 1" can cause a lot of issues, especially because it means that your application will never start (And I mean never).
I've shown you a cause and explained possible fixes to you. You can visit StackOverflow in case you'd still be unable to resolve the issue.
Hope this post helped you solve this issue, and waiting for you in the next Quick Fix article!
Source: https://www.worldwithmatt.com/quick-fix-docker-exit-code-1
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