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fence_virsh.py
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#!@PYTHON@ -tt
# The Following Agent Has Been Tested On:
#
# Virsh 0.3.3 on RHEL 5.2 with xen-3.0.3-51
#
import sys, re
import time
import atexit
sys.path.append("@FENCEAGENTSLIBDIR@")
from fencing import *
from fencing import fail_usage
def get_name_or_uuid(options):
return options["--uuid"] if "--uuid" in options else options["--plug"]
def get_outlets_status(conn, options):
if "--use-sudo" in options:
prefix = options["--sudo-path"] + " "
else:
prefix = ""
conn.sendline(prefix + "virsh list --all")
conn.log_expect(options["--command-prompt"], int(options["--shell-timeout"]))
result = {}
#This is status of mini finite automata. 0 = we didn't found Id and Name, 1 = we did
fa_status = 0
for line in conn.before.splitlines():
domain = re.search(r"^\s*(\S+)\s+(\S+)\s+(\S+).*$", line)
if domain != None:
if fa_status == 0 and domain.group(1).lower() == "id" and domain.group(2).lower() == "name":
fa_status = 1
elif fa_status == 1:
result[domain.group(2)] = ("",
(domain.group(3).lower() in ["running", "blocked", "idle", "no state", "paused"] and "on" or "off"))
return result
def get_power_status(conn, options):
prefix = options["--sudo-path"] + " " if "--use-sudo" in options else ""
conn.sendline(prefix + "virsh domstate %s" % (get_name_or_uuid(options)))
conn.log_expect(options["--command-prompt"], int(options["--shell-timeout"]))
for line in conn.before.splitlines():
if line.strip() in ["running", "blocked", "idle", "no state", "paused"]:
return "on"
if "error: failed to get domain" in line.strip() and "--missing-as-off" in options:
return "off"
if "error:" in line.strip():
fail_usage("Failed: You have to enter existing name/UUID of virtual machine!")
return "off"
def set_power_status(conn, options):
prefix = options["--sudo-path"] + " " if "--use-sudo" in options else ""
conn.sendline(prefix + "virsh %s " %
(options["--action"] == "on" and "start" or "destroy") + get_name_or_uuid(options))
conn.log_expect(options["--command-prompt"], int(options["--power-timeout"]))
time.sleep(int(options["--power-wait"]))
def main():
device_opt = ["ipaddr", "login", "passwd", "cmd_prompt", "secure", "port", "sudo", "missing_as_off"]
atexit.register(atexit_handler)
all_opt["secure"]["default"] = "1"
all_opt["cmd_prompt"]["default"] = [r"\[EXPECT\]#\ "]
all_opt["ssh_options"]["default"] = "-t '/bin/bash -c \"" + r"PS1=\\[EXPECT\\]#\ " + "/bin/bash --noprofile --norc\"'"
options = check_input(device_opt, process_input(device_opt))
docs = {}
docs["shortdesc"] = "Fence agent for virsh"
docs["longdesc"] = "fence_virsh is an I/O Fencing agent \
which can be used with the virtual machines managed by libvirt. \
It logs via ssh to a dom0 and there run virsh command, which does \
all work. \
\n.P\n\
By default, virsh needs root account to do properly work. So you \
must allow ssh login in your sshd_config."
docs["vendorurl"] = "http://libvirt.org"
show_docs(options, docs)
## Operate the fencing device
conn = fence_login(options)
result = fence_action(conn, options, set_power_status, get_power_status, get_outlets_status)
fence_logout(conn, "quit")
sys.exit(result)
if __name__ == "__main__":
main()

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