How to resolve a PHP-FPM Primary script unknown with a PHP-FPM and an Nginx Docker container? - php

Question

My situation is this, I have two Docker containers:
Runs PHP-FPM on port 9000
Runs nginx and has PHP files (should the PHP-FPM container have access to the files?)
I keep getting the following error:
FastCGI sent in stderr: "Primary script unknown" while reading response header from upstream, client: 172.17.0.1, ser
ver: _, request: "GET / HTTP/1.1", upstream: "fastcgi://172.17.0.2:9000", host: "172.17.0.3"
I read here that this is "always related to a wrongly set SCRIPT_FILENAME in the nginx fastcgi_param directive."
The problem is, I don't know how to resolve it :-P
Config in Container 2:
server {
listen 80 default_server;
listen [::]:80 default_server;
charset UTF-8;
root /var/www/WordPress;
index index.php index.html index.htm;
server_name _;
location / {
try_files $uri/ /index.php?$args;
}
location ~ \.php$ {
try_files $uri =404;
fastcgi_split_path_info ^(.+\.php)(/.+)$;
fastcgi_index index.php;
fastcgi_pass 172.17.0.2:9000;
include fastcgi_params;
fastcgi_param SCRIPT_FILENAME /var/www/WordPress$fastcgi_script_name;
# set headers
add_header Cache-Control $cc;
access_log off;
expires $ex;
}
location ~* \.(js|css|svg|png|jpg|jpeg|gif|ico|eot|otf|ttf|woff)$ {
add_header Access-Control-Allow-Origin *;
add_header Cache-Control "public";
access_log off;
log_not_found off;
expires 1y;
}
location ~ /\.ht {
deny all;
}
}

Answer 1

Change root line to: root /var/www/WordPress/; for the $fastcgi_script_name doesn't include /

Answer 2

I'm no nginx expert, but literally every instance of fastcgi_param SCRIPT_FILENAME in the docs ends with $fastcgi_script_name, and yours doesn't.

Answer 3

I broke my brain trying to figure out why it is not working.
As usual, it's a matter of inattention.
So, in my nginx.conf I have lines:
set $root "/var/www/html/web";
root $root;
set $bootstrap "index.php";
index $bootstrap;
location / {
index index.html $bootstrap;
try_files $uri $uri/ /$bootstrap?$args;
expires -1;
}
location ~ \.php$ {
fastcgi_split_path_info ^(.+.php)(.*)$;
set $fsn /$bootstrap;
if (-f $document_root$fastcgi_script_name) {
set $fsn $fastcgi_script_name;
}
fastcgi_pass php:9000;
fastcgi_index $bootstrap;
include fastcgi_params;
fastcgi_param SCRIPT_FILENAME $document_root$fsn;
fastcgi_param PATH_INFO $fastcgi_path_info;
fastcgi_param PATH_TRANSLATED $document_root$fsn;
try_files $fsn =404;
expires -1;
}
include defaults.conf;
Very important to pay attention to line if (-f $document_root$fastcgi_script_name) {, because it is a check for existence.
In my docker-compose.yml I had different mounts in the nginx-container and the php-container:
php:
image: aspendigital/octobercms:php7.2-fpm
container_name: "${PROJECT_NAME}_php"
volumes:
- ./web:/var/www/html # <- this line is incorrect! Mounts MUST be identical!
nginx:
image: wodby/nginx:$NGINX_TAG
container_name: "${PROJECT_NAME}_nginx"
depends_on:
- php
environment:
NGINX_STATIC_OPEN_FILE_CACHE: "off"
NGINX_ERROR_LOG_LEVEL: debug
NGINX_BACKEND_HOST: php
NGINX_SERVER_ROOT: /var/www/html/web/
NGINX_CONF_INCLUDE: /var/www/html/nginx/*.conf
volumes:
- ./:/var/www/html:cached
So, replaсing in php-part the volume to the same as in the nginx-part solved my problem.
Be careful!