Connect host nginx and msql with a docker container of php5-fpm - php

Question

I have a legacy Wordpress installation that run with Nginx/MySQL and php5-fpm and I have to move it to a recent VPS that features php7-fpm.
I'd like to leverage the new host VPS already installed Nginx/MySQL and install and use a container for managing php5 requests.
I pulled the official php5-fpm image from Docker Hub
docker pull php:5.6-fpm-alpine
... then I run the the image remapping the port 9000 where php5-fpm is listening and mounting the wordpress root folder (uncertain about that) and mysql socket, without -d flag in order to see the logs live:
docker run --name phpFpm5.6 -p 127.0.0.1:9999:9000 -v /home/ubuntu/www/html:/var/www/html -v /var/run/mysqld/mysqld.sock:/tmp/mysql.sock php:5.6-fpm-alpine
Here's the console logs:
[21-Aug-2017 12:36:19] NOTICE: fpm is running, pid 1
[21-Aug-2017 12:36:19] NOTICE: ready to handle connections
172.17.0.1 - 21/Aug/2017:12:37:09 +0000 "GET /index.php" 404
172.17.0.1 - 21/Aug/2017:12:39:30 +0000 "GET /index.php" 404
When I request the index page from a browser, I'm getting a 404 (not found) response.
Nginx directive:
location ~ \.php$ {
try_files $uri =404;
fastcgi_split_path_info ^(.+\.php)(/.+)$;
fastcgi_pass 127.0.0.1:9999;
fastcgi_index index.php;
include fastcgi_params;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
}
Any clue is really appreciated.
Thanks in advance.
Best,
Luca

Answer 1

Think of container as the remote server. Now the mapping of ports that you are doing 9999:9000 tells docker to connect port number 9999 on host to port number 9000 of the container.
Now in your nginx directive, the one running inside container, you are redirecting at 9999. Instead, it should be 9000.
According to your scenario, all resources are served by the container at port 9999, but port 9999 of container is not accessible to host.