mysql backup with docker code example

Example: mysql backup dump docker file

docker run -it --rm --link my-old-database:mysql mysql sh -c 'echo "[client]\n host=\"$MYSQL_PORT_3306_TCP_ADDR\"\n user=root\n password=\"$MYSQL_ENV_MYSQL_ROOT_PASSWORD\"" > my.cnf && exec mysqldump --defaults-file=my.cnf --databases my_database_name' > db_dump.sql