Chris Hoogendyk wrote:
>
> Frank Smith wrote:
>> fedora wrote:
>>
>>> Hi huys..
>>>
>>> I have 2 situations:
>>>
>>> 1) default directory for MySQL is /var/lib/mysql. If this directory is link
>>> to /var2/db/mysql and if I put /var/lib/mysql in disklist, can amanda do
>>> backup? I think this should be can backup. May I know which directory is the
>>> best to put in disklist for this case?
>>>
>> Amanda will back up the link, but you probably want it to back up the data,
>> so you should use /var2/db/mysql as your disklist entry. Or you may want
>> both, so if you are rebuilding the entire server you would get the link
>> as well, but in that case you might want most or all of /var and not just
>> the database link.
>>
>>> 2) how about this one. In /var/lib/mysql has databases but certain databases
>>> in linking to /var3/mysql like:
>>>
>>> lrwxrwxrwx 1 root root 42 May 16 2007 AngelClub ->
>>> /var3/mysql/AngelClub
>>> drwx------ 2 mysql mysql 4096 Nov 13 11:55 BabyMobile
>>> drwx------ 2 mysql mysql 4096 Nov 13 11:55 BestClub
>>>
>>> If I put only /var/lib/mysql in disklist, can amanda backup for /var3/mysql?
>>> Or should add both /var/lib/mysql and /var3/mysql in disklist? Please
>>> advise.
>>>
>> You would need both. /var/lib/mysql would pick up the BabyMobile and
>> BestClub databases, but would only record the link to AngelClub and not
>> the database itself, so you would have to add /var3/mysql/AngelClub to
>> get that database.
>
>
> This requires just a bit of clarification.
>
> Amanda calls on native tools to do the backups. On Solaris, people
> typically choose to use ufsdump. On Linux, people typically choose to
> use gnutar. So the question depends on the behavior of those tools and
> possibly the parameters Amanda calls them with, though I doubt Amanda
> would call gnutar with --dereference and --create.
>
> ufsdump will faithfully backup a partition. That is, it backs up links
> as links and restores them as links. It backs up mount points as mount
> points and doesn't follow them into other mounted partitions. It deals
> properly with weird things such as doors. So, to paraphrase, when you
> ask ufsdump to do a partition, you get the partition, the whole
> partition, and nothing but the partition.
>
> I'm less familiar with all the gnuances of gnutar, and some people will
> substitute star or a wrapper of their own. But gnutar will typically
> backup a symlink as a symlink, though it has parameters that can be
> tweaked to do otherwise. Gnutar also typically follows mount points into
> other mounted partitions, though I'm going to take a guess that Amanda
> passes it the parameter that tells it not to do that. It would seem
> contrary to the concept of the way DLE's are configured to have gnutar
> expanding mount points.
Yes, tar can follow links, but Amanda calls it with the --one-file-system
option so it won't cross filesystem boundariea.
Frank
>
> Aside from the above, I go along with Frank's response.
>
> In addition, you should read the backup reports. Check the sizes of your
> partitions with `df -k` and then compare those with what the Amanda
> reports as the amount of data having been backed up. See if they make
> sense. And do trial recoveries to confirm that what you think got backed
> up really did get backed up and that you can recover it.
>
> Also, since you are doing mySQL, be sure you are taking into account the
> peculiarities of backing up databases.
>
>
> ---------------
>
> Chris Hoogendyk
>
> -
> O__ ---- Systems Administrator
> c/ /'_ --- Biology & Geology Departments
> (*) \(*) -- 140 Morrill Science Center
> ~~~~~~~~~~ - University of Massachusetts, Amherst
>
> <hoogendyk AT bio.umass DOT edu>
>
> ---------------
>
> Erdös 4
>
>
--
Frank Smith fsmith AT hoovers DOT com
Sr. Systems Administrator Voice: 512-374-4673
Hoover's Online Fax: 512-374-4501
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