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+#+title: Fixing Permission Errors in /var/lib/nginx
+#+date: 2022-11-11
+#+description: Learn how to fix permission errors related to the Nginx temporary file storage.
+#+filetags: :nginx:
+
+/This is a brief post so that I personally remember the solution as it
+has occurred multiple times for me./
+
+* The Problem
+After migrating to a new server OS, I started receiving quite a few
+permission errors like the one below. These popped up for various
+different websites I'm serving via Nginx on this server, but did not
+prevent the website from loading.
+
+I found the errors in the standard log file:
+
+#+begin_src sh
+cat /var/log/nginx/error.log
+#+end_src
+
+#+begin_src sh
+2022/11/11 11:30:34 [crit] 8970#8970: *10 open() "/var/lib/nginx/tmp/proxy/3/00/0000000003" failed (13: Permission denied) while reading upstream, client: 169.150.203.10, server: cyberchef.example.com, request: "GET /assets/main.css HTTP/2.0", upstream: "http://127.0.0.1:8111/assets/main.css", host: "cyberchef.example.com", referrer: "https://cyberchef.example.com/"
+#+end_src
+
+You can see that the error is =13: Permission denied= and it occurs in
+the =/var/lib/nginx/tmp/= directory. In my case, I had thousands of
+errors where Nginx was denied permission to read/write files in this
+directory.
+
+So how do I fix it?
+
+* The Solution
+In order to resolve the issue, I had to ensure the =/var/lib/nginx=
+directory is owned by Nginx. Mine was owned by the =www= user and Nginx
+was not able to read or write files within that directory. This
+prevented Nginx from caching temporary files.
+
+#+begin_src sh
+# Alpine Linux
+doas chown -R nginx:nginx /var/lib/nginx
+
+# Other Distros
+sudo chown -R nginx:nginx /var/lib/nginx
+#+end_src
+
+You /may/ also be able to change the =proxy_temp_path= in your Nginx
+config, but I did not try this. Here's a suggestion I found online that
+may work if the above solution does not:
+
+#+begin_src sh
+nano /etc/nginx/http.d/example.com.conf
+#+end_src
+
+#+begin_src conf
+server {
+  ...
+
+  # Set the proxy_temp_path to your preference, make sure it's owned by the 
+  # `nginx` user
+  proxy_temp_path /tmp;
+
+  ...
+}
+#+end_src
+
+Finally, restart Nginx and your server should be able to cache temporary
+files again.
+
+#+begin_src sh
+# Alpine Linux (OpenRC)
+doas rc-service nginx restart
+
+# Other Distros (systemd)
+sudo systemctl restart nginx
+#+end_src