Environment Configurations in Docker Containers

[najmus96]

The difference is subtle so I always follow the rule that if there are cases, even borderline ones, for which I might need that particular Container without a connection then the simple link should always be preferred while on the contrary the dependency should always be preferred.


Each software usually has different features and must be configured in a particular way to work properly. Think of the database that during the installation phase must know which password to set, or maybe we think of WordPress, to which we must make known the same password as the database in order to find it already configured and ready to go at startup!

To operate these specific configurations Docker comes to our aid and provides us with the instruction environment, with france whatsapp resource which we can indicate all the specific configurations of the environment.

YAML
1
...
2
mariadb :
3
...
4
environment :
5
MYSQL_ROOT_PASSWORD : myc00lp@ssw0rd
6
wordpress :
7
...
8
environment :
9
WORDPRESS_DB_PASSWORD : myc00lp@ssw0rd
10
phpmyadmin :
11
...
12
environment :
13
PMA_USER : root
14
PMA_PASSWORD : myc00lp@ssw0rd
15
PMA_HOST : mysql
16
...
These configurations are not common to all Containers because each environment has particular needs so we have to go and get them from the documentation of the images themselves. Don't worry if it seems like a lot of work because very often it is the maintainers of the images that provide us with examples of particular configurations from which to take inspiration and, above all, if you know the software in question it is also easy to understand which ones will be necessary.

Let's take as an example our phpMyAdmin Container to which we have linked the Container mariadb.