Re: Slow loading of virtually hosted web content

On Fri, Dec 10, 2021 at 6:25 PM Jeffrey E Altman <[email protected]>
wrote:

> On 11/29/2021 1:11 PM, Kendrick Hernandez ([email protected])
> wrote:
>
> We were able to narrow the problem down to DNS timeouts from an internal
> DNS server that had reached its limit for NF connection tracking. Once that
> limit was increased, the issue went away.
> Along with some forwarded insights from the folks at CMU and some isolated
> testing, we were able to confirm that disabling dynamic root and DNS-based
> server discovery on the cache manager also worked around issue.
>
> I'm glad you identified a solution.
>
> Do you know what the issued DNS queries were for?
>
We believe they were triggered by requests for /afs/.htaccess, as these web
servers have it enabled.


> The primary reason to avoid disabling dynamic root is the machine restarts
> and the OpenAFS cache manager cannot read the "root.afs" volume from the
> cell, the system will panic.  This could be due to the machine booting
> without a network interface or a failure of the cell similar to what
> occurred on January 14th of this year.
>
> The afsd -afsdb option is not required for a web server that will only be
> serving content from the local cell if the cell's location service list of
> servers is present in the local CellServDB file.   Sites that want the
> option of being able to dynamically relocate their location service
> instances will want to avoid local CellServDB entries.
>
Ah, good to know. Thanks!

k-

-- 
Kendrick Hernandez
*UNIX Systems Administrator*
Division of Information Technology
University of Maryland, Baltimore County