Re: clustered lvm volume activation

Dear Guy, thanks for your answer. I came exactly to the same solution after i failed to get the build environment running. My first try was to change the "lvchange" params in the storage driver from "-aln" to "-asn" to get the volumes mounted in shared mode. But this idea was not good anyway because it can lead to data corruption if two domains mount the volume r/w. Then i disabled the autostart of the storage pools and wrote a qemu python hook to activate and deactivate the volumes on prepare and release. It is a quick fix for now but if anyone is interested...find the hook code below... Regards, Timm ----------------------------- #!/usr/bin/python3 # # Libvirt hook for qemu. # # This hook prepares and releases domain LVM volumes in shared LVM volume group # import logging from logging.handlers import SysLogHandler import subprocess import sys import xml.etree.ElementTree as etree # name of the shared volume group # if this string is part of the # domain disk source device path, # the disk will be activated shared_vg = 'vmgroup1' LOG = logging.getLogger(__file__) LOG.setLevel(logging.DEBUG) handler = SysLogHandler(address = '/dev/log') formatter = logging.Formatter('libvirt-hook: %(levelname)s: %(message)s') handler.setFormatter(formatter) LOG.addHandler(handler) def find_disks(args): root = etree.fromstring(args) disk_nodes = root.findall(".//disk[@device='disk']") disks = [] for disk_node in disk_nodes: if disk_node.attrib.get('type') == 'block': disk = disk_node.find('./source') # get device path lv_path = disk.attrib['dev'] if shared_vg in lv_path: # append path without /dev/ disks.append(lv_path[5:]) return disks def main(): if len(sys.argv) < 3: LOG.debug("Nothing to do: too few arguments") sys.exit() domain = sys.argv[1] action = sys.argv[2] if action == 'prepare': LOG.debug("Preparing {}...".format(domain)) xml = sys.stdin.read() for disk in find_disks(xml): LOG.debug("Trying to activate LV: {}...".format(disk)) try: subprocess.check_call(['lvchange','-ay', disk]) except subprocess.CalledProcessError as e: LOG.exception("Unable to activate LVM volume {} for {}".format(lv_path, domain)) LOG.error("Output: %s", e.output) LOG.debug("Successfully prepared {}...".format(domain)) elif action == 'release': LOG.debug("Releasing {}...".format(domain)) xml = sys.stdin.read() for disk in find_disks(xml): LOG.debug("Trying to deactivate LV: {}...".format(disk)) try: subprocess.check_call(['lvchange','-an', disk]) except subprocess.CalledProcessError as e: LOG.exception("Unable to deactivate LVM volume {} for {}".format(lv_path, domain)) LOG.error("Output: %s", e.output) LOG.debug("Successfully released {}...".format(domain)) if __name__ == '__main__': try: main() except Exception: LOG.exception("Unexpected exception occured") ------------------------------ Am 19.02.20 um 10:33 schrieb Guy Godfroy: -- __________________________________________ Timm Wunderlich Systemadministrator Universität Siegen, Fakultät III Lehrstuhl für Wirtschaftsinformatik und Neue Medien Kohlbett Str. 15, 57068 Siegen Tel: +49 271-740 3382 timm.wunderlich(a)uni-siegen.de www.wineme.uni-siegen.de -----BEGIN PGP PUBLIC KEY BLOCK----- mQINBFtFv/cBEAC8s0N+dShoUlPAjN089DyWGuWuZHGJcHyU81GmSI5lYLdOqvfN NAZzZcUckuxlzqvT/Z18IbXMlzxkzxgM9Cf+x3TYdkEFW2Nm8NqdPAdW5Y9is8xg 3FcWjvSSj52VwkM8WvpR40X4c5amXxfIU0YfkGW49xMHNrvd+4keniNrsOhYR2Ej EHTEGfHz7jT0YiO2kytfpQqTFKGgeAsFzlfXJuqB4b6FVBrQ+EJnvsDfhpwVDpli XY4Kn9PeDNXNW85f2z9EplvYyOh0LVBFIXKle/k2v+2YLkthj0xAwYdxswytwzM8 YnRnNWAN0s+e1XKqyBR7ND8HN5pnETWAYfPNrB2PWJk8RcwK8Sh/CBlp43w0AZ0F 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