[OpenAFS] AFSDB records
Brunckhorst, Ralf
ralf.brunckhorst@hp.com
Tue, 4 May 2010 15:31:02 +0000
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Hi,
I would like to get some info regarding AFSDB-records.
Here some background info:
* 30000-40000 afs-clients running on Linux/Solaris.
* client-version: 1.2.x and 1.4.x
* 2 cells with 3 x AFSDB-servers for each cell
* near all clients have a static CellServDB file
* only access to the 2 cells in the intranet
The basic setup of the cells was done in the end of the 90. and only for =
one site. After several years the usage has increased and now many site =
worldwide are using the AFS-cells.
Because there are some changes in our IT-envirenment we have to move the =
AFSDB-servers to a new central DataCenter. And this require a change of =
the CellServDB on every afs-client.
We have created 2 DNS-domains (like our two AFS-cells) that include the =
AFSDB-records for every AFSDB-server.
All new installed afs-clients will get the following config:
* afsd options: "-afsdb -dynroot -fakestat"
* CellServDB will include only the cell-name without any AFSDB-IPs =
(needed because we use dynroot)
>CELL-1
>CELL-2
So new afs-clients will get new AFSDB-Server config automatically via =
DNS.
Questions:=20
* What is the behavior of a running afs-client if we change an =
AFSDB-record in DNS (because one of the AFSDB-server is moved to a new =
location)?
* Will the changes be done automatically on the afs-client?=20
* Also for the Cache Manager's kernel-resident list of database server =
machines?
We have an update-script for the existing old afs-clients that have a =
CellServDB file with static IP info. This will be run daily via cron.
It fetch a central CellServDB file (if it difer with the local one) and =
change the kernel-resisdent list via 'fs newcell =85'
Questions:
* How can we migrate those clients to use the AFSDB-records without =
rebooting (will the kernel-resisdent list updated if the afsd started =
with -afsdb)?
* Or is the reboot needed to get rid of the kernel-list?
* Which is the oldest afs-version that have support for -afsdb?
We will change only one AFSDB-server per week so the clients have time =
to make the changes via the script.
I hope you can give me some feedback.
/Ralf
=20=
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<html><head></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space; =
">Hi,<div><br></div><div>I would like to get some info regarding =
AFSDB-records.</div><div><br></div><div>Here some background =
info:</div><div> * 30000-40000 afs-clients running on =
Linux/Solaris.</div><div> * client-version: 1.2.x and =
1.4.x</div><div> * 2 cells with 3 x AFSDB-servers for each =
cell</div><div> * near all clients have a static CellServDB =
file</div><div> * only access to the 2 cells in the =
intranet</div><div>The basic setup of the cells was done in the end of =
the 90. and only for one site. After several years the usage has =
increased and now many site worldwide are using the =
AFS-cells.</div><div><br></div><div>Because there are some changes in =
our IT-envirenment we have to move the AFSDB-servers to a new central =
DataCenter. And this require a change of the CellServDB on every =
afs-client.</div><div><br></div><div>We have created 2 DNS-domains (like =
our two AFS-cells) that include the AFSDB-records for every =
AFSDB-server.</div><div>All new installed afs-clients will get the =
following config:</div><div> * afsd options: "-afsdb -dynroot =
-fakestat"</div><div> * CellServDB will include only the =
cell-name without any AFSDB-IPs (needed because we use =
dynroot)</div><div> =
>CELL-1</div><div> >CELL-2</div><div>So =
new afs-clients will get new AFSDB-Server config automatically via =
DNS.</div><div><br></div><div>Questions: </div><div> * =
What is the behavior of a running afs-client if we change an =
AFSDB-record in DNS (because one of the AFSDB-server is moved to a new =
location)?</div><div> * Will the changes be done =
automatically on the afs-client? </div><div> * <font =
class=3D"Apple-style-span" size=3D"3"><span class=3D"Apple-style-span" =
style=3D"font-size: 12px;">Also for the </span></font><span =
class=3D"Apple-style-span" style=3D"font-family: arial, sans-serif; =
"><font class=3D"Apple-style-span" size=3D"3"><span =
class=3D"Apple-style-span" style=3D"font-size: 12px;">Cache Manager's =
kernel-resident list of database server =
machines?</span></font></span></div><div><font class=3D"Apple-style-span" =
face=3D"arial, sans-serif"><font class=3D"Apple-style-span" =
size=3D"3"><span class=3D"Apple-style-span" style=3D"font-size: =
12px;"><br></span></font></font></div><div><font =
class=3D"Apple-style-span" face=3D"arial, sans-serif"><font =
class=3D"Apple-style-span" size=3D"3"><span class=3D"Apple-style-span" =
style=3D"font-size: 12px;"><br></span></font></font></div><div><font =
class=3D"Apple-style-span" face=3D"arial, sans-serif"><font =
class=3D"Apple-style-span" size=3D"3"><span class=3D"Apple-style-span" =
style=3D"font-size: 12px;">We have an update-script for the existing old =
afs-clients that have a CellServDB file with static IP info. This will =
be run daily via cron.</span></font></font></div><div><font =
class=3D"Apple-style-span" face=3D"arial, sans-serif">It fetch a central =
CellServDB file (if it difer with the local one) and change the =
kernel-resisdent list via 'fs newcell =85'</font></div><div><font =
class=3D"Apple-style-span" face=3D"arial, =
sans-serif">Questions:</font></div><div><font class=3D"Apple-style-span" =
face=3D"arial, sans-serif"> * How can we migrate those =
clients to use the AFSDB-records without rebooting (will the =
kernel-resisdent list updated if the afsd started with =
-afsdb)?</font></div><div><font class=3D"Apple-style-span" face=3D"arial, =
sans-serif"> * Or is the reboot needed to get rid of the =
kernel-list?</font></div><div><font class=3D"Apple-style-span" =
face=3D"arial, sans-serif"> * Which is the oldest afs-version =
that have support for -afsdb?</font></div><div><font =
class=3D"Apple-style-span" face=3D"arial, =
sans-serif"><br></font></div><div><font class=3D"Apple-style-span" =
face=3D"arial, sans-serif">We will change only one AFSDB-server per week =
so the clients have time to make the changes via the =
script.</font></div><div><font class=3D"Apple-style-span" face=3D"arial, =
sans-serif"><br></font></div><div><font class=3D"Apple-style-span" =
face=3D"arial, sans-serif">I hope you can give me some =
feedback.</font></div><div><font class=3D"Apple-style-span" face=3D"arial,=
sans-serif"><br></font></div><div><font class=3D"Apple-style-span" =
face=3D"arial, sans-serif">/Ralf</font></div><div><span =
class=3D"Apple-style-span" style=3D"font-family: arial, sans-serif; =
font-size: small; "><span class=3D"Apple-style-span" style=3D"font-family:=
Helvetica; font-size: medium; =
"> </span></span></div></body></html>=
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