Posts tagged dns

If your application uses getaddrinfo instead of gethostbyname (for IPv6), DNS round robin will not work. Urgh. Recently found this as the cause of our Java app only connecting to half of the hosts in our AWS ELB.

9th March, 10:30 pm

dns prefetch can be a big deal for sites that give a subdomain per user

12th September, 11:20 pm

i can never find the dnslint tool that i really liked, but the opendns cache tool is a bit useful

30th June, 3:36 pm

some guys i know had some DNS issues when they switched servers. turns out you need to open port 53 for TCP aswell as UDP. who knew? some details here

23rd November, 7:59 pm

a couple of great articles on the issues involved with gslb. if anyone has any idea how akamai's freeflow/edgesuite claims to provide dc failover in around a minute i'd live to know - dns trickery or route convergence?

11th April, 10:32 am

of course, someone has already set up a public portal and dns server to help you avoid the hard part of setting it up.

13th July, 4:08 pm

good news via salt: verisign to stop being so shit and update atlas once every 5 minutes instead of 12 hours.

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This is the personal site of Cal Henderson, Slack co-founder & CTO, ex Glitch engineer, ex Flickr architect, programmer, author and chronic complainer.

I give occasional talks, write code and sometimes articles. I also blog at World of Theorycraft and those links show up here too.

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