Simple docker-compose with two services: nginx and php - php

Question

I'm beginning with Docker and nginx, and I'm trying to setup a two container environment running:
nginx:latest on one side
php:fpm on the other side
I'm having trouble with php-fpm: I always get a 502 Bad Gateway error.
My setup is straightforward ($TEST_DIR is my working directory).
My Docker compose config TEST_DIR/docker-compose.yml:
nginx:
image: nginx
ports:
- "8080:80"
volumes:
- ./www:/usr/share/nginx/html
- ./conf/nginx.conf:/nginx.conf
- ./logs/nginx:/var/log/nginx
links:
- php:php
command: nginx -c /nginx.conf
php:
image: php:fpm
ports:
- "9000:9000"
volumes:
- ./www:/var/www/html
The nginx config $TEST_DIR/conf/nginx.conf:
user nginx;
worker_processes 1;
pid /var/run/nginx.pid;
events {
worker_connections 2048;
multi_accept on;
use epoll;
}
http {
log_format main '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';
access_log /var/log/nginx/access.log main;
server_tokens off;
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 15;
types_hash_max_size 2048;
include /etc/nginx/mime.types;
default_type application/octet-stream;
access_log off;
error_log off;
gzip on;
gzip_disable "msie6";
open_file_cache max=100;
upstream php-upstream {
server php:9000;
}
server {
listen 80;
server_name localhost;
location / {
root /usr/share/nginx/html;
index index.html index.htm;
}
# Pass PHP scripts to PHP-FPM
location ~* \.php$ {
fastcgi_pass php-upstream;
include fastcgi_params;
fastcgi_param SCRIPT_FILENAME /var/www/html$fastcgi_script_name;
fastcgi_param SCRIPT_NAME $fastcgi_script_name;
fastcgi_param HTTPS off;
}
error_log /var/log/nginx/php_error.log;
access_log /var/log/nginx/php_access.log;
}
}
daemon off;
Then, I put my PHP content in the same directory as my docker-compose.yml:
$TEST_DIR/www/test.php
<?php phpinfo(); ?>
If I start the infrastructure using docker-compose up and then go to localhost:8080/test.php, then I get the 502 Bad Gateway
and the following error from nginx:
[error] 6#6: *1 connect() failed (113: No route to host) while connecting to upstream, client: 172.17.42.1, server: localhost, request: "GET /phpinsfo2.php HTTP/1.1", upstream: "fastcgi://172.17.0.221:9000", host: "localhost:8080"
What is causing the error?

Answer 1

I finally managed to make it work.
The problem was that my host computer (Fedora 21) had a firewall enabled.
So doing: systemctl stop firewalld solved my problem.
Apparently this is a well known problem at Red Hat Linux:
Bug 1098281 - Docker interferes with firewall initialisation via firewalld