PHP FPM and nginx are started normally, and page 502 is solved
Background: for the newly installed system, after manually installing PHP, nginx and PHP FPM modules, deploy a PHP project locally. When running, it is found that only nginx version page displays 502
The troubleshooting process is as follows, which is briefly recorded:
Check the startup of PHP FPM and nginx:
# Check if php-fpm and nginx are up
ps -ef|grep php-fpm
ps -ef|grep nginx
The result is: both are up and running
View the nginx log information at the time of the request:
# First, we looked at the location of the nginx runtime logs.
find/-name nginx.conf # Find the nginx configuration file and see where the error.log is stored
# View the error.log information as follows.
*58 connect() failed (111: Connection refused) while connecting to upstream
PHP FPM and nginx are all started normally, so it is not the reason why PHP FPM is not started. Continue to check and find that:
There are two ways to link nginx and php.
1. fastcgi_pass 127.0.0.1:9000;
2. fastcgi_pass unix:/run/php/php7.0-fpm.sock;
You have to go to the php fpm configuration file to see how this works
If Listen is the port, write 127.0.0.1:9000;
If it's a path, the nginx configuration file should learn the path as well.unix:/run/php/php7.0-fpm.sock;
Perfect solution: check the www.conf configuration file, and the path is after listen, so modify the nginx configuration file of the project:
### # fastcgi_pass 127.0.0.1:9000; # Comment out this port and replace it with the following path format
fastcgi_pass unix:/run/php/php7.3-fpm.sock; # fastcgi_pass to the address of phm.sock on the local machine