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I've attached a small script that we use to sync multiple subcobbler
instances to a single master. We currently use an out of band copy
mechanism to get /var/www/cobbler/ks_mirror onto all our cobbler server,
but we had no way of getting cobbler to know about the distro and the
attached profiles. This script will add both, without syncing any data
and create the necessary symlinks in /var/www/cobbler/links.
Why should you use it?
We currently use it for network segmentation purposes. We have several
subcobblers that serve a single part of our network and we don't want to
have to import distros in each place. Instead we use snap mirroring to
get /var/www/cobbler/ks_mirror out and then run cobbler_sync_master to
get cobbler to create the distros and profiles in its configuration
files. This can also be used to distribute the load of a single network
across multiple cobblers mounting ks_mirror off the same nfs share.
How do you use it?
Easy! You use cobbler import to get the distro into the master server.
Then when the ks_mirror files arrive on the subcobblers, you run
'cobbler_sync_master --server master.example.com'. The script will add
any distros that it sees on the master that are not on the subcobbler
and that the kernel has arrived for.
If someone else finds this script useful I'll probably clean it up a bit
and we can throw it in scripts/. If more than a few people find this
useful I'd be willing to port it into cobbler core.
- --
Scott Henson
Red Hat Production Operations Release Engineer
WVU Alum BSAE/BSME
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#!/usr/bin/python
"""
Sync Cobbler with Master
Copyright 2008, Red Hat, Inc
Scott Henson <shenson@xxxxxxxxxx>
This software may be freely redistributed under the terms of the GNU
general public license.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
"""
from cobbler import api
from optparse import OptionParser
import xmlrpclib, os
def link_distro(settings, distro):
# find the tree location
dirname = os.path.dirname(distro.kernel)
tokens = dirname.split("/")
tokens = tokens[:-2]
base = "/".join(tokens)
dest_link = os.path.join(settings.webdir, "links", distro.name)
# create the links directory only if we are mirroring because with
# SELinux Apache can't symlink to NFS (without some doing)
if not os.path.exists(dest_link):
try:
os.symlink(base, dest_link)
except:
# this shouldn't happen but I've seen it ... debug ...
print _("- symlink creation failed: %(base)s, %(dest)s") % { "base" : base, "dest" : dest_link }
def add_distro(cobbler, distro):
#Register the distro
if os.path.exists(distro['kernel']):
new_distro = cobbler.new_distro()
new_distro.from_datastruct(distro)
#create the symlinks
link_distro(cobbler.settings(), new_distro)
#Add the distro permanently
cobbler.distros().add(new_distro, save=True)
print 'Added distro %s. Creating Links.' % distro['name']
return True
else:
print 'Distro %s not here yet.' % distro['name']
return False
def add_profile(cobbler, profile):
#Register the new profile
new_profile = cobbler.new_profile()
new_profile.from_datastruct(profile)
cobbler.profiles().add(new_profile, save=True)
print 'Added profile %s.' % profile['name']
def check_profile(cobbler, profile):
profiles = cobbler.profiles().to_datastruct()
if profile not in profiles:
for distro in cobbler.distros().to_datastruct():
if distro['name'] == profile['name']:
return True
return False
def main(uri):
remote = xmlrpclib.Server(uri)
cobbler = api.BootAPI()
settings = cobbler.settings()
local_profiles = cobbler.profiles()
local_distros = cobbler.distros()
remote_profiles = remote.get_profiles()
remote_distros = remote.get_distros()
needsync = False
for distro in remote_distros:
if distro not in local_distros.to_datastruct():
print 'Found distro %s.' % distro['name']
if add_distro(cobbler, distro) or needsync:
needsync = True
if needsync:
cobbler.sync()
needsync = False
for profile in remote_profiles:
if check_profile(cobbler, profile):
print 'Found profile %s.' % distro['name']
add_profile(cobbler, profile)
needsync = True
if needsync:
cobbler.sync()
if __name__=='__main__':
parser = OptionParser()
parser.add_option('-s', '--server', dest='server',
help='Server you wish to user',
default=None, type='string')
(opts, args) = parser.parse_args()
if opts.server is None:
parser.error('You must provide a server')
uri = 'http://%s/cobbler_api' % opts.server
main(uri)
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