php-fpm Connection reset by peer

Question

I'm trying to get php-fpm set up on a Docker image.

Here's the service in my docker-compose.yml:

wordpress-service:
  build:
    context: .
    dockerfile: Dockerfile-wordpress
  image: riffsy-web-wordpress:latest
  restart: always
  links:
   - wordpress-mysql
  depends_on:
   - wordpress-mysql
  expose:
    - "8000"
  environment:
   - DB_NAME=wordpress
   - DB_USER=wordpress
   - DB_PASSWORD=password123
   - DB_HOST=wordpress-mysql
   - DB_PORT=3306
  ports:
   - "8000:8000"

Docker image uses this command:

CMD php-fpm7.0 --fpm-config /etc/php-fpm.conf

Here's my php-fpm conf:

[global]

error_log = /dev/stderr
log_level = debug
daemonize = no

[www]
listen = 8000
listen.allowed_clients = 127.0.0.1
user = www-data
group = www-data
pm = dynamic
pm.max_children = 6
pm.start_servers = 2
pm.min_spare_servers = 1
pm.max_spare_servers = 4
pm.max_requests = 500
request_terminate_timeout = 120s
catch_workers_output = yes

I set listen.allowed_clients = 127.0.0.1 because otherwise I got connection refused messages; eventually I'll need php-fpm to accept connections from any IP, because I don't know what IP my Nginx image will have, and it doesn't matter since my php-fpm image won't be publicly connected to the internet.

I ran docker exec to login to the running image and ran wget to test out the server:

root@428d78fd58df:/srv# wget 127.0.0.1:8000                           
--2016-09-12 07:55:13--  http://127.0.0.1:8000/
Connecting to 127.0.0.1:8000... connected.
HTTP request sent, awaiting response... Read error (Connection reset by peer) in headers.
Retrying.

--2016-09-12 07:55:14--  (try: 2)  http://127.0.0.1:8000/
Connecting to 127.0.0.1:8000... connected.
HTTP request sent, awaiting response... Read error (Connection reset by peer) in headers.
Retrying.

--2016-09-12 07:55:16--  (try: 3)  http://127.0.0.1:8000/
Connecting to 127.0.0.1:8000... connected.
HTTP request sent, awaiting response... Read error (Connection reset by peer) in headers.
Retrying.

^C

The console shows no output other than:

wordpress-service_1  | [12-Sep-2016 08:01:09.757039] DEBUG: pid 5, fpm_pctl_perform_idle_server_maintenance(), line 379: [pool www] currently 0 active children, 2 spare children, 2 running children. Spawning rate 1

Answer 1

The problem is that php-fpm doesn't use the http protocol, it uses fastcgi. The only way to connect with it was by setting up Nginx to use fastcgi.