[Linux-HA] updating cib.xml?

[Patrik Martinsson]

Hello Steve.

I use the same method to update my cib, exect for everey update i do i
increase the admin_epoch number to a higher one
<cib admin_epoch="0" epoch="0" num_updates="0"> would mean in my new cib
<cib admin_epoch="1" epoch="0" num_updates="0">then i use the -R -x flag to
cibadmin, like cibadmin -R -x mynewcib.xml

Althou i read in the pdf Micheal Alger sent this following, (that seems to
be a VERY good document btw. thanks for that one)

*admin_epoch *
*Never modified by the cluster. Use this to make the configurations on any
inactive nodes obsolete.
Never set this value to zero, in such cases the cluster cannot tell the
difference between your
configuration and the "empty" one used when nothing is found on disk.*

*epoch*
*Incremented every time the configuration is updated (usually by the admin)*

*num_updates*
*Incremented every time the configuration or status is updated (usually by
the cluster)*

So maybe i shiould try increasing epoch instead of admin_epoch, i´ll try
that later.

Anyway, hope it helps you out.

Best regards,
Patrik Martinsson, student, sweden.



2008/7/4 jeff at bofus.org <jeff at bofus.org>:

Here is the process I use to update using the entire cib.xml:
>
> # Dump the CIB to a file:
> cibadmin -Q > /tmp/cib.xml
>
> # edit the cib.xml with your updates
> vi /tmp/cib.xml
>
> # Short verify:
> crm_verify -VVVV -x /tmp/cib.xml
>
> # Long verify:
> crm_verify -VVVVV -x /tmp/cib.xml
>
> # Run Ptest to again verify:
> ptest -VVVV -X /tmp/cib.xml
>
> # Once happy with new cib file, do the actual CIB replace:
> cibadmin -R -x /tmp/cib.xml
>
> # Check that the resources are good:
> crm_mon -1
>
> Hope it helps...
>
> -JPH
>
>
> Steve Wray wrote:
>
>> Michael Alger wrote:
>>
>>> On Fri, Jul 04, 2008 at 10:14:57AM +1200, Steve Wray wrote:
>>>
>>>> Having made a copy of the cib.xml file and modified that copy, I
>>>> had thought that the way to make it live was to run:
>>>>
>>>> # cibadmin  -R -x cib.xml
>>>> Call cib_replace failed (-45): Update was older than existing
>>>> configuration
>>>> <null>
>>>>
>>>> however, as you can see, this doesn't work.
>>>>
>>>> Its odd because I don't see any data in the update which tells
>>>> cibadmin anything about how old it is. I tried touch on the new
>>>> cib.xml file but this changed nothing.
>>>>
>>>
>>> I doubt it uses the timestamp of the file you're using in any way,
>>> since you can also make updates by directly passing cibadmin an XML
>>> string.
>>>
>>> I think the "epoch" and/or the "num_updates" attributes of the <cib>
>>> element might indicate its age.
>>>
>>
>> Yeah thats what I figured so I removed them in my modified cib.xml file,
>> still didn't work
>>
>>
>>  Are you copying the cib.xml from the file system, or obtaining it
>>> with cibadmin -Q?
>>>
>>
>> ah yes... I did copy the cib.xml from the filesystem and modify that, then
>> try to feed it back into cibadmin...
>>
>> I'll try getting it from cibadmin -Q next time.
>>
>>
>>
>>
>>  Is this not the right way to replace the entire existing cib.xml
>>>> with the modified version?
>>>>
>>>
>>> I've never updated the whole CIB, only parts of it, so I'm not
>>> entirely sure. Offhand I'd try modifying the <cib> element to have
>>> no attributes at all, but that may be a bad idea if you're using -R.
>>>
>>>  This page: http://www.linux-ha.org/v2/AdminTools/cibadmin
>>>>
>>>> only gives examples with replacing specific things; I want to
>>>> replace the entire file.
>>>>
>>>
>>> Have you seen this PDF:
>>>
>>> http://clusterlabs.org/mw/Image:Configuration_Explained.pdf
>>> (link is to a page about the PDF, not the PDF itself)
>>>
>>> I've only just started reading it, but it seems like it will be
>>> pretty informative. I particularly liked the part about the GUI.
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>>>
>>
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