John Davidson

Message:

i am currently trying to run my Website in a Docker container using mysql and php with apache.

Docker-Compose:

version: '3.7'

services:

  mysql:

    image: mysql:latest

    container_name: mysql

    restart: always

    environment:

      //Database configuration variables



    volumes:

      - ./data/mysql/database:/var/lib/mysql



  webserver:

    image: php:7.4.12-apache

    depends_on:

      - mysql

    restart: always

    volumes:

      - ./data/webserver:/var/www/html/

    ports:

      - 8888:80

    command: bash -c "docker-php-ext-install mysqli && kill -HUP 1"



  phpmyadmin:

    depends_on:

      - mysql

    image: phpmyadmin:latest

    container_name: phpmyadmin

    links:

      - mysql:db

    restart: always

    ports:

     - 8889:80

    volumes:

     - /sessions

The problem began after i added the command-block to the webserver-container. Without it, the container runs perfectly and i can access the website. But with the command, the container gets stuck in a boot-loop and it seems that it tries to run the command over and over. At least thats what i guess after looking at the log of the webserver container.
However when i use docker exec -it *webserver* bash and run the installation command directly in the container, it works perfectly. I then restart apache with kill -HUP 1 and the Website works as intended. Does anyone know what the problem is here?

---

My Answer:
It seems like the issue might be related to how the command is being executed in the Dockerfile. Instead of running the command in the Dockerfile, you can try running it in a separate script and then executing that script in the Dockerfile.

Here's an example of how you can modify your Dockerfile to run the installation command in a separate script:

1. Create a script file (e.g., install_mysqli.sh) with the following content:

bash
#!/bin/bash

docker-php-ext-install mysqli
kill -HUP 1


2. Update your Dockerfile to copy the script file into the container and execute it:

Dockerfile
FROM php:7.4.12-apache

COPY install_mysqli.sh /usr/local/bin/
RUN chmod +x /usr/local/bin/install_mysqli.sh

CMD ["/usr/local/bin/install_mysqli.sh"]


By separating the installation command into a script file and executing it in the Dockerfile, you might be able to avoid the boot-loop issue. Give this approach a try and see if it resolves the problem.