ssh -fN -i ~/.ssh/id_rsa -o "ProxyCommand ssh -p ${BASTION_PORT} ${BASTION_USER}@${BASTION_HOST} -W %h:%p" -L 127.0.0.1:3306:${MYSQL_HOST}:3306 ${APP_USER}@${APP_HOST}
mysql -h127.0.0.1
# 確認
ps -e -o pid,command | grep [s]sh.*-fN.*-L
# kill
kill -SIGTERM ${当該プロセス}