def config(self):
logger.debug("*** Generate /etc/drbd.conf.")
drbdconf = """
global {
usage-count no;
}
resource r0 {
protocol C;
#incon-degr-cmd "echo !DRBD! pri on incon-degr | wall ; sleep 60 ; halt -f";
on %(m0_hostname)s {
device %(r0_device)s;
disk %(r0_disk)s;
address %(m0_linkip)s:7789;
meta-disk internal;
}
on %(m1_hostname)s {
device %(r0_device)s;
disk %(r0_disk)s;
address %(m1_linkip)s:7789;
meta-disk internal;
}
disk {
on-io-error detach;
}
net {
max-buffers 2048;
ko-count 4;
}
syncer {
rate 25M;
al-extents 257; # must be a prime number
}
startup {
wfc-timeout 20;
degr-wfc-timeout 120; # 2 minutes.
}
}
resource r1 {
protocol C;
#incon-degr-cmd "echo !DRBD! pri on incon-degr | wall ; sleep 60 ; halt -f";
on %(m0_hostname)s {
device %(r1_device)s;
disk %(r1_disk)s;
address %(m0_linkip)s:7790;
meta-disk internal;
}
on %(m1_hostname)s {
device %(r1_device)s;
disk %(r1_disk)s;
address %(m1_linkip)s:7790;
meta-disk internal;
}
disk {
on-io-error detach;
}
net {
max-buffers 2048;
ko-count 4;
}
syncer {
rate 25M;
al-extents 257; # must be a prime number
}
startup {
wfc-timeout 20;
degr-wfc-timeout 120; # 2 minutes.
}
}
""" % { "m0_hostname": self.machines["m0"]["hostname"],
"m1_hostname": self.machines["m1"]["hostname"],
"r0_device": self.resources["r0"]["device"],
"r1_device": self.resources["r1"]["device"],
"r0_disk": self.resources["r0"]["disk"],
"r1_disk": self.resources["r1"]["disk"],
"m0_linkip": self.machines["m0"]["linkip"],
"m1_linkip": self.machines["m1"]["linkip"],
}
logger.debug("/etc/drbd.conf: %s" % drbdconf)
self._txt.load(text=drbdconf)
self._txt.save("/etc/drbd.conf")
logger.debug("*** Initialize disk partitions.")
OS.linux.umount( self.resources["r0"]["disk"] )
OS.linux.umount( self.resources["r1"]["disk"] )
OS.runex("dd if=/dev/zero bs=1M count=1 of=%s" % self.resources["r0"]["disk"])
OS.runex("dd if=/dev/zero bs=1M count=1 of=%s" % self.resources["r1"]["disk"])
logger.debug("*** Create Resources.")
OS.runex("yes yes | drbdadm create-md r0")
OS.runex("yes yes | drbdadm create-md r1")
def startup(self, instance):
nic = self.machines["m%s" % instance]["nic"]
self._txt.load(file="/etc/sysconfig/network-scripts/ifcfg-%s" % nic)
self._txt.set_param("BOOTPROTO", "static")
self._txt.set_param("DHCPCLASS", "")
self._txt.set_param("IPADDR", self.machines["m%s" % instance]["linkip"])
self._txt.set_param("NETMASK", "255.255.255.0")
self._txt.set_param("ONBOOT", "yes")
self._txt.save()
logger.debug("restart the network interface")
OS.runex("ifdown %s" % nic)
OS.runex("ifup %s" % nic)
self._svc.start()
if not os.path.exists("/proc/drbd"):
raise Exception("ERROR: cannot start drbd service.")
drbd_status = None
logger.debug("*** active resources.")
if instance == 0 :
drbd_status = ".*Primary.*UpToDate.*"
logger.debug("r0, r1 are set as primary.")
OS.runex("drbdadm -- --overwrite-data-of-peer primary r0")
OS.runex("drbdadm -- --overwrite-data-of-peer primary r1")
elif instance == 1:
drbd_status = ".*Secondary.*UpToDate/UpToDate.*"
logger.debug("r0, r1 are set as secondary.")
OS.runex("drbdadm secondary r0")
OS.runex("drbdadm secondary r1")
step_pass = False
logger.debug("*** Waiting for secondary drbd resources to sync")
logger.debug("*** It will take half an hour or more depends on the disk size.")
while not step_pass:
self._txt.load(file="/proc/drbd")
proc_drbd = self._txt.read()
logger.debug("/proc/drbd: \n%s", proc_drbd)
if "sync'ed" not in proc_drbd:
step_pass = True
time.sleep(30)
else:
raise Exception("instance must be 0 or 1")
logger.debug("*** Waiting for drbd resources ready")
drbd_r0_status = 0
drbd_r1_status = 0
while drbd_r0_status != 1 or drbd_r1_status != 1:
self._txt.load(file="/proc/drbd")
proc_drbd = self._txt.read()
logger.debug("/proc/drbd: \n%s", proc_drbd)
if re.search("0:%s" % drbd_status, proc_drbd):
drbd_r0_status = 1
if re.search("1:%s" % drbd_status, proc_drbd):
drbd_r1_status = 1
time.sleep(10)
logger.debug("*** Resources are ready.")
self._txt.load(file="/proc/drbd")
proc_drbd = self._txt.read()
logger.debug("/proc/drbd: \n%s", proc_drbd)
if instance == 0:
logger.debug("*** Format DRBD devices.")
OS.runex("mkfs.ext4 %s" % self.resources["r0"]["device"])
OS.runex("mkfs.ext4 %s" % self.resources["r1"]["device"])
OS.linux.mount( self.resources["r0"]["device"], self.resources["r0"]["dir"], "ext4" )
OS.linux.mount( self.resources["r1"]["device"], self.resources["r1"]["dir"], "ext4" )
(retcode, svc_status) = OS.run("service drbd status")
if retcode != 0:
raise Exception("get drbd service status failed")
if re.search("0:r0%s%s" % (drbd_status, self.resources["r0"]["dir"]), svc_status) and re.search("1:r1%s%s" % (drbd_status, self.resources["r1"]["dir"]), svc_status):
logger.debug("drbd installation successfully.")
else:
raise Exception("drbd installation failed.")
File.move( "%s.cache" % self.resources["r0"]["dir"], self.resources["r0"]["dir"] )
File.move( "%s.cache" % self.resources["r1"]["dir"], self.resources["r1"]["dir"] )
self._svc.config(autostart=True)
self._txt.load(file="/etc/fstab")
self._txt.delete(r"%s|%s" % (self.resources["r0"]["disk"], self.resources["r1"]["dir"]))
self._txt.save()
logger.debug("*** DRBD Setup Finished.")