Question 81877 in Docker Question posted in
The official documentation can be found here.

How to check file's content in a container, if this container failes to start? – Docker

I’m trying to build a php chess app and wrap it in Docker container. At first I took my old docker config, but it didn’t work, so I added some stuff on top of it (like copying config apache files into the container and so on). The point is – I copy apache2/ports.conf into the container which only consists of only one line Listen 80. But after running the container it shows that there is an error on line 5. And when I look at the content of the file before running,it shows it consists of only 1 line, so I’m confused. In the repo (link below) I have this file.

-> % docker start -a chess_php_1
[Tue Sep 13 18:25:20.097378 2022] [so:warn] [pid 1] AH01574: module access_compat_module is already loaded, skipping
[Tue Sep 13 18:25:20.097542 2022] [so:warn] [pid 1] AH01574: module alias_module is already loaded, skipping
[Tue Sep 13 18:25:20.097582 2022] [so:warn] [pid 1] AH01574: module auth_basic_module is already loaded, skipping
[Tue Sep 13 18:25:20.097626 2022] [so:warn] [pid 1] AH01574: module authn_core_module is already loaded, skipping
[Tue Sep 13 18:25:20.097672 2022] [so:warn] [pid 1] AH01574: module authn_file_module is already loaded, skipping
[Tue Sep 13 18:25:20.097716 2022] [so:warn] [pid 1] AH01574: module authz_core_module is already loaded, skipping
[Tue Sep 13 18:25:20.097757 2022] [so:warn] [pid 1] AH01574: module authz_host_module is already loaded, skipping
[Tue Sep 13 18:25:20.097805 2022] [so:warn] [pid 1] AH01574: module authz_user_module is already loaded, skipping
[Tue Sep 13 18:25:20.097859 2022] [so:warn] [pid 1] AH01574: module autoindex_module is already loaded, skipping
[Tue Sep 13 18:25:20.097909 2022] [so:warn] [pid 1] AH01574: module deflate_module is already loaded, skipping
[Tue Sep 13 18:25:20.097960 2022] [so:warn] [pid 1] AH01574: module dir_module is already loaded, skipping
[Tue Sep 13 18:25:20.098011 2022] [so:warn] [pid 1] AH01574: module env_module is already loaded, skipping
[Tue Sep 13 18:25:20.098056 2022] [so:warn] [pid 1] AH01574: module filter_module is already loaded, skipping
[Tue Sep 13 18:25:20.098106 2022] [so:warn] [pid 1] AH01574: module mime_module is already loaded, skipping
[Tue Sep 13 18:25:20.098151 2022] [so:warn] [pid 1] AH01574: module mpm_prefork_module is already loaded, skipping
[Tue Sep 13 18:25:20.098195 2022] [so:warn] [pid 1] AH01574: module negotiation_module is already loaded, skipping
[Tue Sep 13 18:25:20.098241 2022] [so:warn] [pid 1] AH01574: module php7_module is already loaded, skipping
[Tue Sep 13 18:25:20.098286 2022] [so:warn] [pid 1] AH01574: module reqtimeout_module is already loaded, skipping
[Tue Sep 13 18:25:20.098325 2022] [so:warn] [pid 1] AH01574: module rewrite_module is already loaded, skipping
[Tue Sep 13 18:25:20.098367 2022] [so:warn] [pid 1] AH01574: module setenvif_module is already loaded, skipping
[Tue Sep 13 18:25:20.098406 2022] [so:warn] [pid 1] AH01574: module status_module is already loaded, skipping
[Tue Sep 13 18:25:20.100451 2022] [alias:warn] [pid 1] AH00671: The Alias directive in /etc/apache2/mods-enabled/alias.conf at line 14 will probably never match because it overlaps an earlier Alias.
AH00526: Syntax error on line 5 of /etc/apache2/ports.conf:

That’s the errro I’m getting after running the container.
Steps to reproduce:

  1. download the project https://github.com/ShadowFlade/chess
  2. in the root of it execute docker-compose up
    All of the above is executable considered you have docker and docker-compose installed.
    My first question, hope i did good.
    P.S.:If you have any tips on how to better use docker in this project (or in general),I’m all ears.
Tags:

2

Answers


  1. 0

    As far as I know, you can start a single container with a custom command like:
    docker run my_container sleep n_seconds where my_container is the name of the container and n_seconds is the time for the container to remain in that sleeping state.
    You can look into the container with docker exec -it my_container /bin/bash.

    But maybe this won’t work if your PHP container from the docker-compose file depends on the other containers in some way.
    Then you could try to add:
    command: sleep n_seconds to the container in the docker-compose and start it as usual with docker-compose up or docker-compose up -d, and then look into the container.

    Sources:
    Docker Compose keep container running
    https://devopscube.com/keep-docker-container-running/

    Login or Signup to reply.
  2. 0

    For troubleshooting one can start built docker image with bash instance as follows:

    # docker images # get docker image id
docker run --rm -it --entrypoint bash <docker-image-id>

    navigate to config folder and check if config file exists and its content is correct.

    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search