def __storeMeta(self, containerName, nfsMount, cowdir, unionMount, lzcopydir):
mdfile = utils.getContainerMDFile(containerName)
volMap = {}
newVol = {}
newVol["nfs"] = nfsMount
newVol["cow"] = cowdir
newVol["union"] = unionMount
newVol["lazy"] = lzcopydir
if os.path.exists(mdfile):
volMap = pickle.load( open( mdfile, "rb" ))
volMap[unionMount] = newVol
pickle.dump( volMap, open( mdfile, "wb" ) )
def failoverVolumes(self, containerId):
mdfile = utils.getContainerMDFile(containerId)
rc = codes.SUCCESS
volMap = {}
if os.path.exists(mdfile):
volMap = pickle.load( open( mdfile, "rb" ))
for unionMout, mountMap in volMap.items():
logging.debug("Starting failover for volume: %s"%(unionMout))
#1. unmount the aufs directory
logging.debug("Un-mounting aufs mount point : %s"%(unionMout))
cmd = UNMOUNT_CMD.substitute(MOUNT = str(unionMout))
rc = self.__exec(cmd)
if rc == codes.SUCCESS:
logging.debug("aufs mount point unmounted successfully: %s"%(unionMout))
else:
return rc
#2. delete aufs mount directory
umdir = unionMout.rstrip('/')
cmd = "rm -rf %s"%(umdir)
rc = self.__exec(cmd)
if rc == codes.SUCCESS:
logging.debug("aufs mount point deleted successfully %s"%(unionMout))
else:
return rc
#3. rename lazy directory to mount point
lazycopyDir = volMap[unionMout]["lazy"].rstrip("/")
os.rename(lazycopyDir, umdir)
logging.debug("lazycopy directory renamed from %s to %s"%(lazycopyDir, umdir))
#4. hard-link from cow to unin mount directory
cmd = COPY_WITH_HARDLINKS.substitute(SRC = volMap[unionMout]["cow"], TARGET = unionMout)
rc = self.__exec(cmd)
if rc == codes.SUCCESS:
logging.debug("Data files hard-linked successfully")
else:
return rc
#5. unmount nfs
cmd = UNMOUNT_CMD.substitute(MOUNT = volMap[unionMout]["nfs"])
self.__exec(cmd)
return rc
