502 Bad Gateway - Help with PHP 7.4

[netphil]

In response to the prompting I decided to upgrade from PHP 7.2 to 7.4 yesterday. I found this guide for folks on Ubuntu 18.04 and followed the steps, only to remember when I got to the last one that I’m running NGINX not Apache. D’oh. My last update ran in early November.

Upgrading php7.2 to php7.4 in Ubuntu 18.04LTS

For those of you that need to upgrade their php from 7.2 to 7.4, here is the process that I went through and was able to do so easily on Ubuntu18.04LTS Add php7.4 libraries sudo apt update sudo apt -y install software-properties-common sudo add-apt-repository ppa:ondrej/php sudo add-apt-repository ppa:ondrej/apache2 sudo apt update Remove php7.2 apt purge libapache2-mod-php7.2 php7.2-cli php7.2-curl php7.2-gd php7.2-json php7.2-mbstring php7.2-mysql php7.2-snmp php7.2-xml php7.2-zip Insta…

I went in search of install/upgrade instructions for NGINX but didn’t find a lot. The install guide for LibreNMS still lists PHP 7.2 but I did find this on Reddit.

https://www.reddit.com/r/LibreNMS/comments/jritf2/help_upgrade_to_php_74_issue_librenms_not_working/

I edited the file to match:

server {
listen 80;
server_name myserver.mydomain;
root /opt/librenms/html;
index index.php;

charset utf-8;
gzip on;
gzip_types text/css application/javascript text/javascript application/x-javascript image/svg+xml text/plain text/xsd text/xsl text/xml image/x-icon;
location / {
try_files $uri $uri/ /index.php?$query_string;
}
location /api/v0 {
try_files $uri $uri/ /api_v0.php?$query_string;
}
location ~ [^/].php(/|$) {
fastcgi_pass unix:/run/php-fpm-librenms.sock;
fastcgi_split_path_info ^(.+.php)(/.+)$;
include fastcgi.conf;
}
location ~ /.ht {
deny all;
}

Pulled down master from git.

Still no luck. Rebooted. Ran /validate a couple times and fixed several things successively that it output.

sudo ln -s /opt/librenms/lnms /usr/local/bin/lnms
sudo cp /opt/librenms/misc/lnms-completion.bash /etc/bash_completion.d/
/opt/librenms/scripts/composer_wrapper.php install --no-dev

I’m now getting a warning about my database being out of date that says to run ./lnms migrate but I’m a bit nervous about losing all my data if something goes wrong there and I doubt it is causing the 502 error.

Any help is appreciated!