This chapter will describe two very important subjects – how to
exclude data that you don't want to backup and how to split huge data
into small pieces.
Excluding
As you've seen before, we specified file with list of directories
to exclude in our backup style:
define dumptype default
{
exclude list "amandaexclude"
}
File 'amandaexclude' should be located
at top directory of each disk you define. For example, if you have
/home defined in your disklist file, you should locate file
'amandaexclude' as '/home/amandaexclude'. In this file you need to
specify files that you don't want to backup:
log/httpd/*
log/httpd2/*
log/httpd2-ssl/*
log/httpsd/*
log/maillog*
tmp/*
*.tmp
*.temp
Remember, you should specify
directories starting from defined disk. For example, if you have
'/var' defined in your disklist and if you put '/var/log/httpd/' into
exclude list, amanda will think that you want to exclude
'/var/var/log/httpd'
Splitting data
One of disadvantages of
amanda software is inability to split single huge disk to several
tapes. Unfortunately, each disk defined in disklist must fit one
tape. In order to avoid this problem you need to define
subdirectories of your huge directories. But there's a problem and
let us to use one of most complicated example of /home structure:
/home/mysql/
/home/www/
/home/users/user1
/home/users/user2
In order to find all
directories like /home/users/userxxx, you can use command:
find /home -t d -mindepth 2 -maxdepth 2
It will find all directories
that you'd like to backup separately. But in order to find other data
located at /home, you could use command:
find /home -t d -mindepth 1 -maxdepth 1
But it will not work and
here's why. It will find directory /home/users and place into our
disklist, which will cause backuping /home/users, which is impossible
in case if /home/users exceeds our tapes' size. So if you combine
both results of find, you'll see:
/home/mysql/
/home/www/
/home/users/
/home/users/user1
/home/users/user2
To avoid this problem, you
need to put the whole directory /home into your disklist, but put
directories '/home/users/userxxx' into exclude list of /home. So
final disklist for partition /home would like shown below:
server1.domain.com
/home
{
default2
exclude append /home/users/user1
exclude append /home/users/user2
}
server1.domain.com /home/users/user1
{
default
}
server1.domain.com /home/users/user2
{
default
}
server1.domain.com /home/users/user100
{
default
}
One note. We used different backup
style 'default2' that doesn't have option 'exclude',
otherwise it will overwrite the option 'exclude append'.
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