CODEWITHSUNDEEP
mysqlwordpressdocker-composeport
Lorraine
Lorraine

Reputation: 486

Port available to set in docker-compose.yml for mysql and wordpress

I have an application where i can create several wordpress project each one with a docker-compose.yml file to launch a local wordpress env.

I setted:

mysql: ports: - 8081:3306

wordpress ports: - 8080:80

I would like to each project has a unique port configuration to allow launch all if i need it or to dont use a used port and return an error.

So, what range of ports are available to use for mysql and wordpress?

Do you know if it is possible or is a bad idea?

Thanks you

Upvotes: 0

Views: 743

Answers (1)

TylerLubeck
TylerLubeck

Reputation: 638

Totally possible! The trick is to only specify the port that is internal to the container. Then, when docker-compose boots up, it'll automatically assign a host port mapping to the internal container port.

For instance, if you define your docker-compose.yaml like so:

version: '3'
services:
    mysql:
        image: mysql
        ports:
            - 3306
        environment:
            - MYSQL_ROOT_PASSWORD=badpassworddontdothis
    wordpress:
        image: wordpress
        ports:
            - 80

And run docker-compose up, we can look at the port mappings that were assigned:

❯ docker-compose ps
        Name                      Command               State                 Ports
--------------------------------------------------------------------------------------------------
67077886_mysql_1       docker-entrypoint.sh mysqld      Up      0.0.0.0:55362->3306/tcp, 33060/tcp
67077886_wordpress_1   docker-entrypoint.sh apach ...   Up      0.0.0.0:55361->80/tcp

This shows that you can access the mysql container on host port 55362, and wordpress on port 55361.

If you need to programatically get the exposed port for a given service, you can run:

❯ docker-compose port wordpress 80
0.0.0.0:55361

and you'll get back the ip/port pair that will allow you to talk to wordpress container port 80:

❯ curl -v $(docker-compose port wordpress 80)
*   Trying 0.0.0.0...
* TCP_NODELAY set
* Connected to 0.0.0.0 (127.0.0.1) port 55361 (#0)
> GET / HTTP/1.1
> Host: 0.0.0.0:55361
> User-Agent: curl/7.64.1
> Accept: */*
>
< HTTP/1.1 302 Found
< Date: Tue, 13 Apr 2021 20:09:03 GMT
< Server: Apache/2.4.38 (Debian)
< X-Powered-By: PHP/7.4.16
< Location: http://0.0.0.0:55361/wp-admin/setup-config.php
< Content-Length: 0
< Content-Type: text/html; charset=UTF-8
<
* Connection #0 to host 0.0.0.0 left intact
* Closing connection 0

(The 302 is because I didn't actually set up wordpress, but it's still a response from the server so it counts).

Upvotes: 1

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