Install PHP composer in existing docker image

Question

I'm running docker-letsencrypt through a docker-compose.yml file. It comes with PHP. I'm trying to run PHP composer with it. I can install composer while being in the container through bash, but that won't stick when I recreate the container. How do I keep a permanent install of composer in an existing container that doesn't come with compose by default?

My docker-compose.yml looks like this:

version: "3"
services:

  letsencrypt:
    image: linuxserver/letsencrypt
    container_name: letsencrypt
    cap_add:
      - NET_ADMIN
    ports:
      - "80:80"
      - "443:443"
    environment:
      - PUID=1000
      - PGID=1000
      - EMAIL=<mailadress>
      - URL=<tld>
      - SUBDOMAINS=<subdomains>
      - VALIDATION=http
      - TZ=Europe/Paris
    volumes:
      - /home/ubuntu/letsencrypt:/config

I did find the one-line installer for composer:

php -r "readfile('http://getcomposer.org/installer');" | php -- --install-dir=/usr/bin/ --filename=composer

I could add this to command in my docker-compose.yml, but that would reinstall composer even on container restarts right?

Aserre · Accepted Answer · 2018-03-12 12:24:57Z

3

You're right about your comment about the command option, it will indeed be run every time you launch your container.

One workaround would be to create your own dockerfile, as follow :

FROM linuxserver/letsencrypt
RUN php -r "readfile('http://getcomposer.org/installer');" | php -- --install-dir=/usr/bin/ --filename=composer

(RUN directives are only run during the build step).

You should then modify your docker-compose.yml :

...
build: ./dir
  #dir/ is the folder where your Dockerfile resides
  #use the dockerfile directive if you use a non-default naming convention
  #or if your Dockerfile isn't at the root of your project 
container_name: letsencrypt
  ...

answered Mar 12, 2018 at 12:24

Aserre

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