Knowledge Base

Unable to change nginx cache: invalid condition “$request_uri”

Symptoms

Unable to change nginx cache or additional nginx directives in Domains > example.com > Apache & nginx Settings that leads to failed Apache configuration:

PLESK_ERROR: ERROR: Invalid nginx configuration: nginx: [emerg] invalid condition “$request_uri” in /etc/nginx/plesk.conf.d/vhosts/example.com.conf:47 nginx: configuration file /etc/nginx/nginx.conf test failed

Disable caching for locations parameter in Nginx cache in Domains > example.com > Apache & nginx Settings was set incorrectly initially, but Plesk allowed to set it.

Cause

Product issue:

#PPPM-12101 “Plesk now validates custom nginx configuration before applying it. It is no longer possible to misconfigure nginx in a way that is impossible to undo via the Plesk interface.”

Fixed in:
- Plesk Obsidian 27 October 2020 (Linux)

Resolution

Please consider updating your server:

How to install Plesk updates

Workaround

If update is not possible for some reason you may try the following

workaround

As a workaround, remove Disable caching for locations that is specified as nginxCacheBypassLocations from the database:

Connect to the server via SSH
Backup Plesk database:

# plesk db dump psa > psa_dump.sql
Find the webServerSettingsId for the affected domain:

# plesk db -sNe “SELECT val FROM dom_param WHERE dom_id in (SELECT id FROM domains WHERE name=’example.com‘) AND param=’webServerSettingsId'”
74

Replace example.com with the domain shown in the error message.
Remove the incorrect configuration from the database:

# plesk db “DELETE FROM WebServerSettingsParameters WHERE name=’nginxCacheBypassLocations’ AND webServerSettingsId=74“

Replace the webServerSettingsId with the ID found in step 3
Reconfigure all domains:

# plesk repair web -y