https://www.cyberciti.biz/faq/howto-linux-renew-dhcp-client-ip-address/

root@mx:/etc# blkid
/dev/sda1: LABEL="boot" UUID="e40fb979-51bf-4b8d-b09f-77eda3e74cf0" SEC_TYPE="ext2" TYPE="ext3"
/dev/sdb: UUID="1c01e3cb-3930-4cc2-8da2-4cc6acff4adb" SEC_TYPE="ext2" TYPE="ext3"
root@mx:/etc#