Jun 052016
When you have those items
- use Linode to host DNS zones
- use Let’s Encrypt and use DNS TXT record to proof you own the domain
you should automate the process of renewal certificates since it’s required every 3 months.
Turns out that Linode has an API for DNS changes, and using it is very simple. To look at TXT records like this:
linode domain -a record-show -l studiokubota.com -t TXT
which shows all TXT records. Add “-j” to get JSON output. Filter via jq if you need specific items as the CLI does not seem to be able to filter by itself. jq fixes that:
linode domain -a record-show -l studiokubota.com -t TXT -j | jq '."studiokubota.com".records[] | select(.name=="_acme-challenge.harald")'
Update a particular TXT record like this:
linode domain -a record-update -l studiokubota.com -t TXT -R zXwdu1_lMOdYhAp4cS12JxZV3Wuv1YZG001U3E mJMck -m _acme-challenge.harald
to update the DNS challenge for harald.studiokubota.com.