Use "hostname --ip-address" consistently

mongo/docker-healthcheck

@@ -1,7 +1,9 @@
 #!/bin/bash
 set -eo pipefail
 
-if mongo --quiet localhost --eval 'quit(db.runCommand({ ping: 1 }).ok ? 0 : 2)'; then
+host="$(hostname --ip-address || echo '127.0.0.1')"
+
+if mongo --quiet "$host/test" --eval 'quit(db.runCommand({ ping: 1 }).ok ? 0 : 2)'; then
 	exit 0
 fi
 

mysql/docker-healthcheck

@@ -7,13 +7,13 @@ if [ "$MYSQL_RANDOM_ROOT_PASSWORD" ] && [ -z "$MYSQL_USER" ] && [ -z "$MYSQL_PAS
 	exit 0
 fi
 
+host="$(hostname --ip-address || echo '127.0.0.1')"
 user="${MYSQL_USER:-root}"
-
 export MYSQL_PWD="${MYSQL_PASSWORD:-$MYSQL_ROOT_PASSWORD}"
 
 args=(
 	# force mysql to not use the local "mysqld.sock" (test "external" connectibility)
-	-h"$(hostname --ip-address || echo '127.0.0.1')"
+	-h"$host"
 	-u"$user"
 	--silent
 )

postgres/docker-healthcheck

@@ -1,13 +1,13 @@
 #!/bin/bash
 set -eo pipefail
 
+host="$(hostname --ip-address || echo '127.0.0.1')"
 user="${POSTGRES_USER:-postgres}"
-
 export PGPASSWORD="${POSTGRES_PASSWORD:-}"
 
 args=(
 	# force postgres to not use the local unix socket (test "external" connectibility)
-	--host "$(hostname --ip-address || echo '127.0.0.1')"
+	--host "$host"
 	--username "$user"
 	--quiet --no-align --tuples-only
 )

redis/docker-healthcheck

@@ -1,7 +1,9 @@
 #!/bin/bash
 set -eo pipefail
 
-if ping="$(redis-cli ping)" && [ "$ping" = 'PONG' ]; then
+host="$(hostname --ip-address || echo '127.0.0.1')"
+
+if ping="$(redis-cli -h "$host" ping)" && [ "$ping" = 'PONG' ]; then
 	exit 0
 fi