Difference between revisions of "Fix a 502 Bad Gateway error on calibre-web"
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Activate the python virtual environment | Activate the python virtual environment | ||
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cd parallel_library | cd parallel_library | ||
source venv/bin/activate</syntaxhighlight> | source venv/bin/activate</syntaxhighlight> |
Revision as of 17:06, 2 November 2021
Sometimes, when making changes to the server settings in the calibre-web browser interface, you may get a 502 error. This means that the server isn't responding to HTTP requests. This quick-fix assumes you have SSH access to the machine you are running calibre-web from. If you have local access, even better, you can just restart the server directly.
Connect to the server. In my case, I have the hostname set as parallel-library in my ~/.ssh/config file:
ssh parallel-library
Activate the python virtual environment
cd parallel_library
source venv/bin/activate
Check to see if nginx is running
systemctl status nginx
Find the process ID (PID) for cps.py (the python script running calibre)
ps -aux | grep python
For me, running this produces:
root 29857 0.3 1.0 297248 83260 ? Sl 15:09 0:07 python cps.py
root 30054 0.0 0.0 5812 888 pts/0 S+ 15:44 0:00 grep python
Note down the number next to this process, the PID. In this case it is 29857.
Then, kill the process (swap out the PID)
kill -9 29857
Run the python script in the background (you can close the terminal after this)
nohup python cps.py
Refresh the page in your browser (do a hard refresh to clear cache) and see if the page reappears. Do a quick uploading/downloading test to make sure it’s all working ok.