Warning: mysqli_real_connect(): php_network_getaddresses: getaddrinfo for db failed: Name or service not known in /var/www/html/wp-includes/wp-db.php on line 1626

Fatal error: Uncaught mysqli_sql_exception: php_network_getaddresses: getaddrinfo for db failed: Name or service not known in /var/www/html/wp-includes/wp-db.php:1626
Stack trace:
#0 /var/www/html/wp-includes/wp-db.php(1626): mysqli_real_connect(Object(mysqli), 'db', 'husblogg', Object(SensitiveParameterValue), NULL, '3306', NULL, 0)
#1 /var/www/html/wp-includes/wp-db.php(631): wpdb->db_connect()
#2 /var/www/html/wp-includes/load.php(426): wpdb->__construct('husblogg', 'S2suE4Kpqx6zSL8...', 'husblogg', 'db:3306')
#3 /var/www/html/wp-settings.php(126): require_wp_db()
#4 /var/www/html/wp-config.php(101): require_once('/var/www/html/w...')
#5 /var/www/html/wp-load.php(37): require_once('/var/www/html/w...')
#6 /var/www/html/wp-blog-header.php(13): require_once('/var/www/html/w...')
#7 /var/www/html/index.php(17): require('/var/www/html/w...')
#8 {main}
  thrown in /var/www/html/wp-includes/wp-db.php on line 1626