[ale] /etc/hosts and caching

[Chesser.Damon]

This dovetails into building a DNS caching server I asked earlier this
week.  The issue is we are seeing latency in our application and a
possible (but only possible, not proven) issue might be host lookups.  I
figured that an entry into /etc/hosts would be faster than a WAN DNS
lookup especially since the IP is static.  Someone was concerned with
disk reads and that becoming a bottleneck.  Someone else pointed out
that /etc/hosts file was cached.  

 

This started a google search by me to find out if that was true or not.
Totally inconclusive.  Some have reported issues with not being able to
get the Linux box to re-read the hosts file after a change was committed
short of a reboot or init restart.  Others have said just make the
change and it shows up.  I have not found any documentation saying
whether it was cached or not.  Any smart guys know the answer or can
provide any documentation on that?  It's kind of funny, you think you
KNOW something until someone says "Prove it".

 

Damon at damtek.com 
  
  
  
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