Run python script with Jenkins

Jenkins

I have an .sh file which spawns a simple http server with python3. What I need is to successfully run this file with Jenkins. The job goes "green" but the directory I try to serve with python http server is not available and the browser says "Request failed". ps -a also does not show any python process.

When I run the python command directly on the console the server gets started and ps -a shows the pid of python process. What am I missing?

Best Answer

It sounds like you are running into the Jenkins Process Tree Killer. Basically, when a build finishes, Jenkins kills any processes started by that build, even if those processes were moved to the background.

To stop processes from being killed, set the environment variable BUILD_ID to anything that doesn't contain the string JENKINS, for instance:

BUILD_ID=dontKillMe

If you are using Pipelines instead of Freestyle jobs, the official docs say to change the value of JENKINS_NODE_COOKIE instead, but I use Pipelines and haven't had any issues by altering only BUILD_ID.

More info in the official docs and in the same question on StackOverflow.

Related Solutions

Jenkins reports reverse proxy setup incorrect with Apache using virtual hosts with SNI

The one issue that I see with your config is that:

ProxyPassReverse  /  https://jenkins.example.com

Should be:

ProxyPassReverse  /  https://jenkins.example.com/

Seems like the service is sending http:// instead of https:// location headers (probably because your connection to its listener from Apache is unencrypted on the localhost listener), in which case you'll need to add:

ProxyPassReverse  /  http://jenkins.example.com/

So, what's probably occurring currently is the API call is failing because it gets an http:// address in the Location: header of the redirect (which is missed for un-translation in the ProxyPassReverse because it's not http).

It sends the request to that location and gets another redirect response, from your <VirtualHost *:80>. Their validity checker knows that ain't right and errors, while curl follows one more redirect and gets a valid response.

Add the ProxyPassReverse for http:// above and this should correct the issue, if I'm right.

How to get Jenkins to execute a script that it pulled from Git

For my build (on a Linux host), I do something like this (as a build step in Jenkins) to execute a build script out of the freshly-checked-out workspace:

Execute shell Command:

 sh -x $WORKSPACE/build/myproject.build

I presume it would work similar on Windows, except of course you would use \ rather than / and you're using python rather than sh to execute your script.

Best Answer

Related Solutions

Jenkins reports reverse proxy setup incorrect with Apache using virtual hosts with SNI

How to get Jenkins to execute a script that it pulled from Git

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