6

So I have a docker container running a PHP 7.2.34 service as follows:-

docker-compose.yml

version: '3'
services:

 #PHP Service
 app:
  build:
   context: .
   dockerfile: Dockerfile
  image: digitalocean.com/php
  container_name: app
  ...

Dockerfile

FROM php:7.2-fpm
...

Rather than restart Nginx I simply restart the containers like:-

docker stop app db webserver
docker rm app db webserver
docker-compose up -d

I'd like to upgrade to PHP 7.4+ or even 8. I tried to simply replace FROM php:7.2-fpm with FROM php:7.4-fpm but phpinfo() reports no change in PHP version? Does: image: digitalocean.com/php have any significance when upgrading?

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4 Answers 4

Reset to default
8
+50

This command will update your image and force stop and recreate the containers:

docker-compose up -d --force-recreate --build

To verify run docker exec -it app php -v this will return the php version info.

# The new image name when running `docker-compose up/build`
image: digitalocean.com/php

Explanation:

The command docker-compose up will build an image only it's not exist.
To force build new image add --build flag or do docker-compose build and then docker-compose up

Reference here

If you want to force Compose to stop and recreate all containers, use the --force-recreate flag.

--build Build images before starting containers.

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1
  • 1
    I tried this one first as it was the most complete in explanation. It works, thanks. I ran into a collection of PHP extension errors with the 7.4 build - but that's another issue. Commented Feb 9, 2021 at 10:01
2

There is a difference between docker images and docker containers.
See docker image ls and docker container ls.

To rebuild the image and create a container run

docker-compose up -d --build

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2

Since you are stopping application anyway you can remove all images from your host with:

docker-compose down --rmi all

then start app with recreation of containers as @Shmuel advised

docker-compose up -d --force-recreate --build
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0

Change your Dockerfile for the destination version for example

FROM php:7.4-fpm

or

FROM php:8.0-fpm

and you adjust your library with this document for 7.xxx

or for 7.xxx to 8.xxx this document

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2
  • These documents seem to explain changes like new and deprecated functionalities, but I don't with a quick view find instructions on how to adjust a library. Could you please edit your answer to clarify? From Review Commented Oct 7, 2021 at 12:59
  • do you have a log by the command docker log? Commented Oct 9, 2021 at 8:36

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