diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 965708da..76941c7c 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -8,6 +8,17 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 The format of this change log follows the advice given at [Keep a CHANGELOG](http://keepachangelog.com).
 
+## [Unreleased]
+### Added
+- Add support for the following optional env variables, that will be used on installation, getting precedence over the corresponding existing option:
+    - `DB_USER`: To specify the database username (alternative to `--db-user`)
+    - `DB_PASS`: To specify the database password (alternative to `--db-pass`)
+    - `DB_NAME`: To specify the database name (alternative to `--db-name`)
+    - `DB_HOST`: To specify the database host (alternative to `--db-host`)
+    - `DB_PORT`: To specify the database port (alternative to `--db-port`)
+
+    Note that these new env variables behave exactly the same than the existing (and often used) `DB` one, that is also a priority alternative to `--db-type` on install.
+
 ## [4.1.0] - 2023-05-29
 ### Added
 - Add the `--testdox` option to the `phpunit` command.
diff --git a/docs/GHAFileExplained.md b/docs/GHAFileExplained.md
index 2df43b0b..ce8c3074 100644
--- a/docs/GHAFileExplained.md
+++ b/docs/GHAFileExplained.md
@@ -120,6 +120,10 @@ jobs:
       #   MUSTACHE_IGNORE_NAMES: 'broken.mustache'
       #   CODECHECKER_IGNORE_PATHS: 'ignoreme'
       #   CODECHECKER_IGNORE_NAMES: 'ignoreme_name.php'
+      #
+      # Other env vars are available for install, namely:
+      #   - DB_USER / DB_PASS / DB_NAME / DB_HOST / DB_PORT: used
+      #     by install to feed the corresponding --db-xxxx options.
       - name: Install moodle-plugin-ci
         run: |
           moodle-plugin-ci install --plugin ./plugin --db-host=127.0.0.1
@@ -176,4 +180,4 @@ jobs:
         if: ${{ always() }}
         run: moodle-plugin-ci behat --profile chrome
 ```
-<!-- {% endraw %} -->
\ No newline at end of file
+<!-- {% endraw %} -->
diff --git a/docs/TravisFileExplained.md b/docs/TravisFileExplained.md
index 3930b194..0c8db5f1 100644
--- a/docs/TravisFileExplained.md
+++ b/docs/TravisFileExplained.md
@@ -55,7 +55,9 @@ env:
 # each version of PHP being tested, one build will be created for each
 # database listed here.  EG: for PHP 7.4, one build will be created
 # using PHP 7.4 and pgsql.  In addition, another build will be created
-# using PHP 7.4 and mysqli.
+# using PHP 7.4 and mysqli. Also, note that DB_USER / DB_PASS / DB_NAME
+# / DB_HOST / DB_PORT env vars can be used by install to feed the
+# corresponding --db-xxxx options.
  matrix:
   - DB=pgsql
   - DB=mysqli
diff --git a/src/Command/InstallCommand.php b/src/Command/InstallCommand.php
index 3158216f..d086e16e 100644
--- a/src/Command/InstallCommand.php
+++ b/src/Command/InstallCommand.php
@@ -67,6 +67,13 @@ protected function configure(): void
             $plugin = getenv('CI_BUILD_DIR') !== false ? getenv('CI_BUILD_DIR') : null;
         }
 
+        // Add more options mapped to environment variables.
+        $dbUser = getenv('DB_USER') !== false ? getenv('DB_USER') : null;
+        $dbPass = getenv('DB_PASS') !== false ? getenv('DB_PASS') : '';
+        $dbName = getenv('DB_NAME') !== false ? getenv('DB_NAME') : 'moodle';
+        $dbHost = getenv('DB_HOST') !== false ? getenv('DB_HOST') : 'localhost';
+        $dbPort = getenv('DB_PORT') !== false ? getenv('DB_PORT') : '';
+
         $this->setName('install')
             ->setDescription('Install everything required for CI testing')
             ->addOption('moodle', null, InputOption::VALUE_REQUIRED, 'Clone Moodle to this directory', 'moodle')
@@ -75,11 +82,11 @@ protected function configure(): void
             ->addOption('branch', null, InputOption::VALUE_REQUIRED, 'Moodle git branch to clone, EG: MOODLE_29_STABLE', $branch)
             ->addOption('plugin', null, InputOption::VALUE_REQUIRED, 'Path to Moodle plugin', $plugin)
             ->addOption('db-type', null, InputOption::VALUE_REQUIRED, 'Database type, mysqli, pgsql or mariadb', $type)
-            ->addOption('db-user', null, InputOption::VALUE_REQUIRED, 'Database user')
-            ->addOption('db-pass', null, InputOption::VALUE_REQUIRED, 'Database pass', '')
-            ->addOption('db-name', null, InputOption::VALUE_REQUIRED, 'Database name', 'moodle')
-            ->addOption('db-host', null, InputOption::VALUE_REQUIRED, 'Database host', 'localhost')
-            ->addOption('db-port', null, InputOption::VALUE_REQUIRED, 'Database port', '')
+            ->addOption('db-user', null, InputOption::VALUE_REQUIRED, 'Database user', $dbUser)
+            ->addOption('db-pass', null, InputOption::VALUE_REQUIRED, 'Database pass', $dbPass)
+            ->addOption('db-name', null, InputOption::VALUE_REQUIRED, 'Database name', $dbName)
+            ->addOption('db-host', null, InputOption::VALUE_REQUIRED, 'Database host', $dbHost)
+            ->addOption('db-port', null, InputOption::VALUE_REQUIRED, 'Database port', $dbPort)
             ->addOption('not-paths', null, InputOption::VALUE_REQUIRED, 'CSV of file paths to exclude', $paths)
             ->addOption('not-names', null, InputOption::VALUE_REQUIRED, 'CSV of file names to exclude', $names)
             ->addOption('extra-plugins', null, InputOption::VALUE_REQUIRED, 'Directory of extra plugins to install', $extra)