From jaltman@auristor.com Fri Dec 10 23:25:09 2021 From: jaltman@auristor.com (Jeffrey E Altman) Date: Fri, 10 Dec 2021 18:25:09 -0500 Subject: [OpenAFS] Slow loading of virtually hosted web content In-Reply-To: References: <3fa2a371-8576-dfb4-a482-5c8b1c5c9b7f@auristor.com> Message-ID: <94dbe234-6cb6-7559-4afd-4b9e809b0bc9@auristor.com> This is a cryptographically signed message in MIME format. --------------ms040808080201020903010708 Content-Type: multipart/alternative; boundary="------------z5xuVL1QlksvaxW946MV0wFD" --------------z5xuVL1QlksvaxW946MV0wFD Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 11/29/2021 1:11 PM, Kendrick Hernandez (kendrick.hernandez@umbc.edu) 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? 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.  AuriStorFS clients implement configurable ignorelists [1] to permit use of dynroot and DNS SRV/AFSDB lookups while blocking lookups for specific names either in the dynroot directory or any volume root directory. Jeffrey Altman [1] fs_ignorelist (auristor.com) --------------z5xuVL1QlksvaxW946MV0wFD Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit
On 11/29/2021 1:11 PM, Kendrick Hernandez (kendrick.hernandez@umbc.edu) 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?

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. 

AuriStorFS clients implement configurable ignorelists [1] to permit use of dynroot and DNS SRV/AFSDB lookups while blocking lookups for specific names either in the dynroot directory or any volume root directory.

Jeffrey Altman

[1] fs_ignorelist (auristor.com)


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mWNKwKw+ioLGOHn8d9BfjDbjB3tUb/7Zy44GmNgYDAAAAAAAAA== --------------ms040808080201020903010708-- From kendrick.hernandez@umbc.edu Tue Dec 14 17:51:57 2021 From: kendrick.hernandez@umbc.edu (Kendrick Hernandez) Date: Tue, 14 Dec 2021 12:51:57 -0500 Subject: [OpenAFS] Slow loading of virtually hosted web content In-Reply-To: <94dbe234-6cb6-7559-4afd-4b9e809b0bc9@auristor.com> References: <3fa2a371-8576-dfb4-a482-5c8b1c5c9b7f@auristor.com> <94dbe234-6cb6-7559-4afd-4b9e809b0bc9@auristor.com> Message-ID: --00000000000022916705d31ed9dc Content-Type: text/plain; charset="UTF-8" On Fri, Dec 10, 2021 at 6:25 PM Jeffrey E Altman wrote: > On 11/29/2021 1:11 PM, Kendrick Hernandez (kendrick.hernandez@umbc.edu) > 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 --00000000000022916705d31ed9dc Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


=
On Fri, Dec 10, 2021 at 6:25 PM Jeffr= ey E Altman <jaltman@auristor.co= m> wrote:
=20 =20 =20
On 11/29/2021 1:11 PM, Kendrick Hernandez (kendrick.hernandez@umbc.edu) wrote:
=20
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.
=C2=A0

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.=C2=A0 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 locatio= n service list of servers is present in the local CellServDB file.=C2= =A0=C2=A0 Sites that want the option of being able to dynamically relocate their location service instances will want to avoid local CellServDB entries.=C2=A0

Ah, good to know. Thanks!

= k-

--
Kendrick Hernandez
UNIX Systems Administrator
Di= vision of Information Technology
University of Maryland, Baltimore County
--00000000000022916705d31ed9dc-- From jaltman@auristor.com Tue Dec 14 18:44:43 2021 From: jaltman@auristor.com (Jeffrey E Altman) Date: Tue, 14 Dec 2021 13:44:43 -0500 Subject: [OpenAFS] Slow loading of virtually hosted web content In-Reply-To: References: <3fa2a371-8576-dfb4-a482-5c8b1c5c9b7f@auristor.com> <94dbe234-6cb6-7559-4afd-4b9e809b0bc9@auristor.com> Message-ID: <401b0459-9c75-f54a-0c14-6403ed242c7f@auristor.com> This is a cryptographically signed message in MIME format. --------------ms000907080006070804040404 Content-Type: multipart/alternative; boundary="------------fupFWX0Yw38VWEeSCygMDuSQ" --------------fupFWX0Yw38VWEeSCygMDuSQ Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 12/14/2021 12:51 PM, Kendrick Hernandez (kendrick.hernandez@umbc.edu) wrote: > > On Fri, Dec 10, 2021 at 6:25 PM Jeffrey E Altman > wrote: > > 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. If an AuriStorFS client were deployed these lookups could be disabled using the following yfs-client.conf configuration file entry. [afsd]     ignorelist-afsmountdir = .htaccess Instead of attempting to resolve a cellular mountpoint for /afs/.htaccess Apache would be provided a zero-length file. Happy Holidays. Jeffrey Altman --------------fupFWX0Yw38VWEeSCygMDuSQ Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit
On 12/14/2021 12:51 PM, Kendrick Hernandez (kendrick.hernandez@umbc.edu) wrote:

On Fri, Dec 10, 2021 at 6:25 PM Jeffrey E Altman <jaltman@auristor.com> wrote:
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.

If an AuriStorFS client were deployed these lookups could be disabled using the following yfs-client.conf configuration file entry.

    [afsd]
        ignorelist-afsmountdir = .htaccess

Instead of attempting to resolve a cellular mountpoint for /afs/.htaccess Apache would be provided a zero-length file.

Happy Holidays.

Jeffrey Altman

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