How to check DNS glue records

“Glue records” are DNS entries in the top level domain name that allows for a domain to look at itself to resolve IP-addresses. In my case, using Lan2k.org as DNS, and wanting to host this myself, I needed to notify my registrar to add glue records into the “.org” -domain.

Run: host -t NS lan2k.org will say:
lan2k.org name server ns1.lan2k.org.
lan2k.org name server ns2.lan2k.org.

Do get this working, my registrar has added these entries as glue records into the .org-domain:
ns1.lan2k.org. 86400 IN AAAA 2a01:4f8:200:91f3::6
ns2.lan2k.org. 86400 IN AAAA 2a01:4f8:200:91f4::6
ns1.lan2k.org. 86400 IN A 144.76.218.244
ns2.lan2k.org. 86400 IN A 144.76.218.245

To read these records from .org, run this command to find which servers are hosting .org:
dig +short org. NS

Then ask one of those servers what records it has for lan2k.org:
dig +norec @b0.org.afilias-nst.org. lan2k.org. NS

This means I must have valid servers running on the IP’s listed above. If those server change IP, you need to notify the registrar so that they can update the glue.

Expanding a guest VM’s disk

Looks like I’m running low on disk on my virtual machine (VM) running ownCloud. Luckily, there’s plenty more available on the host so today I’m expanding the logical volume (LV).

Step one – as always, BACKUP your data. I use rsnapshot together with ssh and mysqldump.

Step two – shutdown the guest.

Step three РOn host run (as root): ssm resize /dev/vg0/cloudStorage -s+250G. Where vg0 is the name of your storage pool and cloudStorage is the name of your LV. SSM is a smart tool that takes care of partitioning, logical volumes, storage pools and file system.

Step four – Start your guest: virsh start ownCloud (or whatever the name of your VM).

Done. Happy clouding!