diff --git a/_run-mariadb.sh b/_run-mariadb.sh
index 92b806b..8309b34 100755
--- a/_run-mariadb.sh
+++ b/_run-mariadb.sh
@@ -2,29 +2,34 @@
 
 SOURCE_DIR=`dirname "${BASH_SOURCE[0]}"`
 
-source "$SOURCE_DIR/env-mariadb.sh"
-
 source "$SOURCE_DIR/common.sh"
+CONTAINER_NAME=mb-mariadb-db-${MARIADB_BROAD_VERSION}
 
 kill-existing ${CONTAINER_NAME}
 
-docker run -p ${HOST_PORT}:3306 \
-       -e MYSQL_DATABASE=${DB_NAME} \
-       -e MYSQL_USER=${DB_USER} \
+docker run -p 3306 \
+       -e MYSQL_DATABASE=metabase \
+       -e MYSQL_USER=mbuser \
        -e MYSQL_ALLOW_EMPTY_PASSWORD=yes \
        --name ${CONTAINER_NAME} \
        --rm \
        -d mariadb:${MARIADB_VERSION}
 
-cat <<EOF
-
-Started MariaDB ${MARIADB_VERSION} on port ${HOST_PORT}.
+source ./env-mariadb.sh ${MARIADB_BROAD_VERSION}
 
-Connect with the MySQL CLI tool:
-mysql --user=${DB_USER} --host=127.0.0.1 --port=${HOST_PORT} --database=${DB_NAME}
+function print-mariadb-vars() {
+    cat <<EOF
+Java properties:
+-Dmb.mysql.test.host=localhost -Dmb.mysql.test.port=${MB_DB_PORT} -Dmb.mysql.test.db=${MB_DB_DBNAME} -Dmb.mysql.test.user=${MB_DB_USER} -Dmb.mysql.test.password=
 
-JDBC URL: jdbc:mysql://localhost:${HOST_PORT}/${DB_NAME}?user=${DB_USER}
+Clojure pairs:
+:mb-mysql-test-host "localhost" :mb-mysql-test-port "${MB_DB_PORT}" :mb-mysql-test-db "${MB_DB_DBNAME}" :mb-mysql-test-user "${MB_DB_USER}" :mb-mysql-test-password ""
 
+Bash variables:
+MB_MYSQL_TEST_HOST=localhost MB_MYSQL_TEST_PORT=${MB_DB_PORT} MB_MYSQL_TEST_DB=${MB_DB_DBNAME}  MB_MYSQL_TEST_USER=${MB_DB_USER} MB_MYSQL_TEST_PASSWORD=''
 EOF
+}
 
-print-mariadb-vars
+if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
+    print-mariadb-vars
+fi
diff --git a/_run-mysql.sh b/_run-mysql.sh
index 8e2e893..e0423bf 100755
--- a/_run-mysql.sh
+++ b/_run-mysql.sh
@@ -2,28 +2,29 @@
 
 SOURCE_DIR=`dirname "${BASH_SOURCE[0]}"`
 
-source "$SOURCE_DIR/env-mysql.sh"
-
 source "$SOURCE_DIR/common.sh"
+CONTAINER_NAME=mb-mysql-db-${MYSQL_BROAD_VERSION}
 
 kill-existing ${CONTAINER_NAME}
 
-docker run -p ${HOST_PORT}:3306 \
-       -e MYSQL_DATABASE=${DB_NAME} \
+docker run \
+       -p 3306 \
+       -e MYSQL_DATABASE=metabase \
+       -e MYSQL_USER=mbuser \
        -e MYSQL_ALLOW_EMPTY_PASSWORD=yes \
        --name ${CONTAINER_NAME} \
        --rm \
        -d mysql:${MYSQL_VERSION}
 
+source ./env-mysql.sh ${MYSQL_BROAD_VERSION}
+
 cat <<EOF
 
-Started MySQL ${MYSQL_VERSION} on port ${HOST_PORT}.
+Started MySQL ${MYSQL_VERSION} on port ${MB_DB_PORT}.
 
 Connect with the MySQL CLI tool:
-mysql --user=${DB_USER} --host=127.0.0.1 --port=${HOST_PORT} --database=${DB_NAME}
+mysql --user=${MB_DB_USER} --host=127.0.0.1 --port=${MB_DB_PORT} --database=${MB_DB_DBNAME}
 
-JDBC URL: jdbc:mysql://localhost:${HOST_PORT}/${DB_NAME}?user=${DB_USER}
+JDBC URL: jdbc:mysql://localhost:${MB_DB_PORT}/${MB_DB_DBNAME}?user=${MB_DB_USER}
 
 EOF
-
-print-mysql-vars
diff --git a/_run-postgres.sh b/_run-postgres.sh
index 6b69907..5217543 100755
--- a/_run-postgres.sh
+++ b/_run-postgres.sh
@@ -1,11 +1,10 @@
 #!/usr/bin/env bash
+set -euo pipefail
 
 SOURCE_DIR=`dirname "${BASH_SOURCE[0]}"`
 
-source "$SOURCE_DIR/env-postgres.sh"
-
 source "$SOURCE_DIR/common.sh"
-
+CONTAINER_NAME=mb-postgres-db-${PG_BROAD_VERSION}
 DATA_DIR=${HOME}/metabase-pgsql-${PG_VERSION}-data
 DOCKER_NETWORK=psql-metabase-network
 
@@ -13,29 +12,30 @@ kill-existing ${CONTAINER_NAME}
 create-network-if-needed ${DOCKER_NETWORK}
 
 docker run \
-       --rm \
        -d \
-       -p ${HOST_PORT}:5432 \
+       -p 5432 \
        --network ${DOCKER_NETWORK} \
-       -e POSTGRES_USER=${DB_USER} \
-       -e POSTGRES_DB=${DB_NAME} \
-       -e POSTGRES_PASSWORD=${DB_PASSWORD} \
+       -e POSTGRES_USER=mbuser \
+       -e POSTGRES_DB=metabase \
+       -e POSTGRES_PASSWORD=password \
        -e PGDATA=/var/lib/postgresql/data \
        -v ${DATA_DIR}:/var/lib/postgresql/data:Z \
        --name ${CONTAINER_NAME} \
        postgres:${PG_VERSION}
 
-cat << EOF
+source ./env-postgres.sh ${PG_BROAD_VERSION}
 
-Started PostgreSQL ${PG_VERSION} on port ${HOST_PORT} via Docker (container name: ${CONTAINER_NAME}).
+if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
+       cat << EOF
+Started PostgreSQL ${PG_VERSION} on port ${MB_DB_PORT} via Docker (container name: ${CONTAINER_NAME}).
 Data will be persisted in ${DATA_DIR} on the host machine (delete it to reset).
 
 To open a SQL client session:
-docker run -it --rm --network ${DOCKER_NETWORK} postgres:${PG_VERSION} psql -h ${CONTAINER_NAME} -U ${DB_USER}
-And enter the DB user password for ${DB_USER}: ${DB_PASSWORD}
+docker run -it --rm --network ${DOCKER_NETWORK} postgres:${PG_VERSION} psql -h ${CONTAINER_NAME} -U ${MB_DB_USER}
+And enter the DB user password for ${MB_DB_USER}: ${MB_DB_PASS}
 
-JDBC URL: jdbc:postgres://localhost:${HOST_PORT}/${DB_NAME}?user=${DB_USER}
+JDBC URL: jdbc:postgres://localhost:${MB_DB_PORT}/${MB_DB_DBNAME}?user=${MB_DB_USER}
 
 EOF
 
-print-postgres-vars
+fi
diff --git a/env-mariadb.sh b/env-mariadb.sh
index 02b3aac..f52a673 100755
--- a/env-mariadb.sh
+++ b/env-mariadb.sh
@@ -1,26 +1,45 @@
 #! /usr/bin/env bash
+if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
+    set -euo pipefail
+fi
+
+SOURCE_DIR=`dirname "${BASH_SOURCE[0]}"`
+cd "$(dirname "$0")"
 
-set -euo pipefail
+if [[ $# -eq 0 ]] && [[ -z "${MARIADB_BROAD_VERSION:-}" ]]; then
+    echo "Usage: ./$(basename "$0") [latest/oldest]" >&2
+    exit 1
+fi
+container=mb-mariadb-db-${1:-$MARIADB_BROAD_VERSION}
+port=$(docker port ${container} 3306/tcp | cut -d: -f2)
+source ${SOURCE_DIR}/getenv.sh ${container} MYSQL_USER MYSQL_DATABASE
+
+export MB_DB_TYPE=mysql
+export MB_DB_DBNAME=${MYSQL_DATABASE}
+export MB_DB_HOST=127.0.0.1
+export MB_DB_PASS=
+export MB_DB_PORT=${port}
+export MB_DB_USER=${MYSQL_USER}
 
-CONTAINER_NAME=mb-mariadb-db
-HOST_PORT=3307
-DB_NAME=metabase_test
-DB_USER=root
+export MB_MYSQL_TEST_USER=${MB_DB_USER}
+export MB_MYSQL_TEST_PASSWORD=
+export MB_MYSQL_TEST_DBNAME=${MYSQL_DATABASE}
+export MB_MYSQL_TEST_HOST=${MB_DB_HOST}
+export MB_MYSQL_TEST_PORT=${MB_DB_PORT}
 
 function print-mariadb-vars() {
     cat <<EOF
 Java properties:
--Dmb.mysql.test.host=localhost -Dmb.mysql.test.port=${HOST_PORT} -Dmb.mysql.test.db=${DB_NAME} -Dmb.mysql.test.user=${DB_USER} -Dmb.mysql.test.password=
+-Dmb.mysql.test.host=localhost -Dmb.mysql.test.port=${MB_DB_PORT} -Dmb.mysql.test.db=${MB_DB_DBNAME} -Dmb.mysql.test.user=${MB_DB_USER} -Dmb.mysql.test.password=
 
 Clojure pairs:
-:mb-mysql-test-host "localhost" :mb-mysql-test-port "${HOST_PORT}" :mb-mysql-test-db "${DB_NAME}" :mb-mysql-test-user "${DB_USER}" :mb-mysql-test-password ""
+:mb-mysql-test-host "localhost" :mb-mysql-test-port "${MB_DB_PORT}" :mb-mysql-test-db "${MB_DB_DBNAME}" :mb-mysql-test-user "${MB_DB_USER}" :mb-mysql-test-password ""
 
 Bash variables:
-MB_MYSQL_TEST_HOST=localhost MB_MYSQL_TEST_PORT=${HOST_PORT} MB_MYSQL_TEST_DB=${DB_NAME}  MB_MYSQL_TEST_USER=${DB_USER} MB_MYSQL_TEST_PASSWORD=''
+MB_MYSQL_TEST_HOST=localhost MB_MYSQL_TEST_PORT=${MB_DB_PORT} MB_MYSQL_TEST_DB=${MB_DB_DBNAME}  MB_MYSQL_TEST_USER=${MB_DB_USER} MB_MYSQL_TEST_PASSWORD=''
 EOF
 }
 
 if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
     print-mariadb-vars
 fi
-
diff --git a/env-mysql.sh b/env-mysql.sh
index 19babfa..a70f444 100755
--- a/env-mysql.sh
+++ b/env-mysql.sh
@@ -1,26 +1,45 @@
 #! /usr/bin/env bash
+if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
+    set -euo pipefail
+fi
+SOURCE_DIR=`dirname "${BASH_SOURCE[0]}"`
+cd "$(dirname "$0")"
+
+if [[ $# -eq 0 ]] && [[ -z "${MYSQL_BROAD_VERSION:-}" ]]; then
+    echo "Usage: ./$(basename "$0") [latest/oldest]" >&2
+    exit 1
+fi
+
+container=mb-mysql-db-${1:-$MYSQL_BROAD_VERSION}
+port=$(docker port ${container} 3306/tcp | cut -d: -f2)
+source ${SOURCE_DIR}/getenv.sh ${container} MYSQL_DATABASE MYSQL_USER
 
-set -euo pipefail
+export MB_DB_TYPE=mysql
+export MB_DB_DBNAME=${MYSQL_DATABASE}
+export MB_DB_HOST=127.0.0.1
+export MB_DB_PASS=
+export MB_DB_PORT=${port}
+export MB_DB_USER=${MYSQL_USER}
 
-CONTAINER_NAME=mb-mysql-db
-HOST_PORT=3306
-DB_NAME=metabase_test
-DB_USER=root
+export MB_MYSQL_TEST_USER=${MB_DB_USER}
+export MB_MYSQL_TEST_PASSWORD=
+export MB_MYSQL_TEST_DBNAME=${MYSQL_DATABASE}
+export MB_MYSQL_TEST_HOST=${MB_DB_HOST}
+export MB_MYSQL_TEST_PORT=${MB_DB_PORT}
 
 function print-mysql-vars() {
     cat <<EOF
 Java properties:
--Dmb.mysql.test.host=localhost -Dmb.mysql.test.port=${HOST_PORT} -Dmb.mysql.test.db=${DB_NAME} -Dmb.mysql.test.user=${DB_USER} -Dmb.mysql.test.password=
+-Dmb.mysql.test.host=localhost -Dmb.mysql.test.port=${MB_DB_PORT} -Dmb.mysql.test.db=${MB_DB_DBNAME} -Dmb.mysql.test.user=${MB_DB_USER} -Dmb.mysql.test.password=
 
 Clojure pairs:
-:mb-mysql-test-host "localhost" :mb-mysql-test-port "${HOST_PORT}" :mb-mysql-test-db "${DB_NAME}" :mb-mysql-test-user "${DB_USER}" :mb-mysql-test-password ""
+:mb-mysql-test-host "localhost" :mb-mysql-test-port "${MB_DB_PORT}" :mb-mysql-test-db "${MB_DB_DBNAME}" :mb-mysql-test-user "${MB_DB_USER}" :mb-mysql-test-password ""
 
 Bash variables:
-MB_MYSQL_TEST_HOST=localhost MB_MYSQL_TEST_PORT=${HOST_PORT} MB_MYSQL_TEST_DB=${DB_NAME}  MB_MYSQL_TEST_USER=${DB_USER} MB_MYSQL_TEST_PASSWORD=''
+MB_MYSQL_TEST_HOST=localhost MB_MYSQL_TEST_PORT=${MB_DB_PORT} MB_MYSQL_TEST_DB=${MB_DB_DBNAME}  MB_MYSQL_TEST_USER=${MB_DB_USER} MB_MYSQL_TEST_PASSWORD=''
 EOF
 }
 
 if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
     print-mysql-vars
 fi
-
diff --git a/env-postgres.sh b/env-postgres.sh
index c353661..5ad1227 100755
--- a/env-postgres.sh
+++ b/env-postgres.sh
@@ -1,23 +1,48 @@
-#! /usr/bin/env bash
+#!/usr/bin/env bash
+if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
+    set -euo pipefail
+fi
+SOURCE_DIR=`dirname "${BASH_SOURCE[0]}"`
+cd "$(dirname "$0")"
+
+if [[ $# -eq 0 ]] && [[ -z "${PG_BROAD_VERSION:-}" ]]; then
+    echo "Usage: ./$(basename "$0") [latest/oldest]" >&2
+    exit 1
+fi
+# `oldest` or `latest`
+container=mb-postgres-db-${1:-$PG_BROAD_VERSION}
+port=$(docker port ${container} 5432/tcp | cut -d: -f2)
+source ${SOURCE_DIR}/getenv.sh ${container} POSTGRES_USER POSTGRES_DB POSTGRES_PASSWORD
+
+export MB_DB_TYPE=postgres
+export MB_DB_DBNAME=${POSTGRES_DB}
+export MB_DB_HOST=127.0.0.1
+export MB_DB_PASS=${POSTGRES_PASSWORD}
+export MB_DB_PORT=${port}
+export MB_DB_USER=${POSTGRES_USER}
 
-set -euo pipefail
+export MB_POSTGRESQL_TEST_USER=${MB_DB_USER}
+export MB_POSTGRESQL_TEST_PASSWORD=${MB_DB_PASS}
+export MB_POSTGRESQL_TEST_DBNAME=${MB_DB_DBNAME}
+export MB_POSTGRESQL_TEST_HOST=${MB_DB_HOST}
+export MB_POSTGRESQL_TEST_PORT=${MB_DB_PORT}
 
-CONTAINER_NAME=mb-postgres-db
-HOST_PORT=${PGSQL_PORT:-5432}
-DB_NAME=metabase
-DB_USER=metabase
-DB_PASSWORD=password
+export PGHOST=${MB_DB_HOST}
+export PGPORT=${MB_DB_PORT}
+export PGUSER=${MB_DB_USER}
+export PGPASSWORD=${MB_DB_PASS}
+export PGDATABASE=${MB_DB_DBNAME}
 
 function print-postgres-vars() {
     cat <<EOF
 Java properties:
--Dmb.postgresql.test.host=localhost -Dmb.postgresql.test.port=${HOST_PORT} -Dmb.postgresql.test.db=${DB_NAME} -Dmb.postgresql.test.user=${DB_USER} -Dmb.postgresql.test.password=${DB_PASSWORD}
+-Dmb.postgresql.test.host=localhost -Dmb.postgresql.test.port=${MB_DB_PORT} -Dmb.postgresql.test.db=${MB_DB_DBNAME} -Dmb.postgresql.test.user=${MB_DB_USER} -Dmb.postgresql.test.password=${MB_DB_PASS}
 
 Clojure pairs:
-:mb-postgresql-test-host "localhost" :mb-postgresql-test-port "${HOST_PORT}" :mb-postgresql-test-db "${DB_NAME}" :mb-postgresql-test-user "${DB_USER}" :mb-postgresql-test-password "${DB_PASSWORD}"
+:mb-postgresql-test-host "localhost" :mb-postgresql-test-port "${MB_DB_PORT}" :mb-postgresql-test-db "${MB_DB_DBNAME}" :mb-postgresql-test-user "${MB_DB_USER}" :mb-postgresql-test-password "${MB_DB_PASS}"
 
 Bash variables:
-MB_POSTGRESQL_TEST_HOST=localhost MB_POSTGRESQL_TEST_PORT=${HOST_PORT} MB_POSTGRESQL_TEST_DB=${DB_NAME}  MB_POSTGRESQL_TEST_USER=${DB_USER} MB_POSTGRESQL_TEST_PASSWORD=${DB_PASSWORD}
+MB_POSTGRESQL_TEST_HOST=localhost MB_POSTGRESQL_TEST_PORT=${MB_DB_PORT} MB_POSTGRESQL_TEST_DB=${MB_DB_DBNAME}  MB_POSTGRESQL_TEST_USER=${MB_DB_USER} MB_POSTGRESQL_TEST_PASSWORD=${MB_DB_PASS}
 EOF
 }
 
diff --git a/getenv.sh b/getenv.sh
new file mode 100755
index 0000000..c0070b1
--- /dev/null
+++ b/getenv.sh
@@ -0,0 +1,19 @@
+#!/usr/bin/env bash -euo pipefail
+
+container_name="$1"
+shift
+
+env_vars=$(docker inspect ${container_name} -f '{{range .Config.Env}}{{println .}}{{end}}')
+
+output=""
+
+for var_name in "$@"
+do
+    env_var=$(echo "$env_vars" | grep "$var_name=")
+    if [[ -z "$env_var"  ]]; then
+        echo "environment variable ${var_name} not found in the container ${container_name}" >&2
+        return 1
+    fi
+
+    export "$env_var"
+done
diff --git a/run-mariadb-latest.sh b/run-mariadb-latest.sh
index 61a633f..d30576c 100755
--- a/run-mariadb-latest.sh
+++ b/run-mariadb-latest.sh
@@ -2,4 +2,4 @@
 
 SOURCE_DIR=`dirname "${BASH_SOURCE[0]}"`
 
-MARIADB_VERSION=latest $SOURCE_DIR/_run-mariadb.sh
+MARIADB_BROAD_VERSION=latest MARIADB_VERSION=latest $SOURCE_DIR/_run-mariadb.sh
diff --git a/run-mariadb-oldest.sh b/run-mariadb-oldest.sh
index 8dece35..dd77ba2 100755
--- a/run-mariadb-oldest.sh
+++ b/run-mariadb-oldest.sh
@@ -5,4 +5,4 @@ SOURCE_DIR=`dirname "${BASH_SOURCE[0]}"`
 MARIADB_VERSION=$(curl -s --request GET --url https://endoflife.date/api/mariadb.json |
 jq -r --arg today $(date +%Y%m%d) 'map(select((.eol == false) or ((.eol | gsub("-";"") | tonumber) > ($today | tonumber)))) | min_by(.cycle) | .cycle')
 
-MARIADB_VERSION=$MARIADB_VERSION $SOURCE_DIR/_run-mariadb.sh
+MARIADB_BROAD_VERSION=oldest MARIADB_VERSION=$MARIADB_VERSION $SOURCE_DIR/_run-mariadb.sh
diff --git a/run-mysql-latest.sh b/run-mysql-latest.sh
index 2cd1be7..f2d90ad 100755
--- a/run-mysql-latest.sh
+++ b/run-mysql-latest.sh
@@ -2,4 +2,4 @@
 
 SOURCE_DIR=`dirname "${BASH_SOURCE[0]}"`
 
-MYSQL_VERSION=latest $SOURCE_DIR/_run-mysql.sh
+MYSQL_BROAD_VERSION=latest MYSQL_VERSION=latest $SOURCE_DIR/_run-mysql.sh
diff --git a/run-mysql-oldest.sh b/run-mysql-oldest.sh
index 51b7fc7..391117c 100755
--- a/run-mysql-oldest.sh
+++ b/run-mysql-oldest.sh
@@ -5,4 +5,4 @@ SOURCE_DIR=`dirname "${BASH_SOURCE[0]}"`
 MYSQL_VERSION=$(curl -s --request GET --url https://endoflife.date/api/mysql.json |
 jq -r --arg today $(date +%Y%m%d) 'map(select((.eol == false) or ((.eol | gsub("-";"") | tonumber) > ($today | tonumber)))) | min_by(.cycle) | .cycle')
 
-MYSQL_VERSION=$MYSQL_VERSION $SOURCE_DIR/_run-mysql.sh
+MYSQL_BROAD_VERSION=oldest MYSQL_VERSION=$MYSQL_VERSION $SOURCE_DIR/_run-mysql.sh
diff --git a/run-postgres-latest.sh b/run-postgres-latest.sh
index 0e17af5..975a1c5 100755
--- a/run-postgres-latest.sh
+++ b/run-postgres-latest.sh
@@ -2,4 +2,4 @@
 
 SOURCE_DIR=`dirname "${BASH_SOURCE[0]}"`
 
-PG_VERSION=latest $SOURCE_DIR/_run-postgres.sh
+PG_BROAD_VERSION=latest PG_VERSION=latest $SOURCE_DIR/_run-postgres.sh
diff --git a/run-postgres-oldest.sh b/run-postgres-oldest.sh
index 27b90d5..649c660 100755
--- a/run-postgres-oldest.sh
+++ b/run-postgres-oldest.sh
@@ -5,4 +5,4 @@ SOURCE_DIR=`dirname "${BASH_SOURCE[0]}"`
 PG_VERSION=$(curl -s --request GET --url https://endoflife.date/api/postgresql.json |
 jq -r --arg today $(date +%Y%m%d) 'map(select((.eol == false) or ((.eol | gsub("-";"") | tonumber) > ($today | tonumber)))) | min_by(.cycle) | .cycle')
 
-PG_VERSION=$PG_VERSION $SOURCE_DIR/_run-postgres.sh
+PG_BROAD_VERSION=oldest PG_VERSION=$PG_VERSION $SOURCE_DIR/_run-postgres.sh