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#!/usr/bin/env python
# Copyright (C) 2016 Red Hat, Inc. <http://www.redhat.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# 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.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
"""
Description: Module for gluster heal related helper functions.
"""
import time
from glusto.core import Glusto as g
from glustolibs.gluster.volume_ops import get_volume_status
try:
import xml.etree.cElementTree as etree
except ImportError:
import xml.etree.ElementTree as etree
def is_heal_enabled(mnode, volname):
"""Check if heal is enabled for a volume.
Args:
mnode : Node on which commands are executed
volname : Name of the volume
Returns:
bool : True if heal is enabled on volume. False otherwise.
NoneType: None if unable to get the volume status.
"""
enabled = True
vol_status_dict = get_volume_status(mnode, volname, service='shd')
if vol_status_dict is None:
g.log.error("Failed to check if heal is enabled on volume %s or not" %
volname)
return None
for node in vol_status_dict[volname].keys():
if not ('Self-heal Daemon' in vol_status_dict[volname][node]):
enabled = False
return enabled
def is_heal_disabled(mnode, volname):
"""Check if heal is disabled for a volume.
Args:
mnode : Node on which commands are executed
volname : Name of the volume
Returns:
bool : True if heal is disabled on volume. False otherwise.
NoneType: None if unable to get the volume status shd or parse error.
"""
cmd = "gluster volume status %s shd --xml" % volname
ret, out, _ = g.run(mnode, cmd, log_level='DEBUG')
if ret != 0:
g.log.error("Failed to get the self-heal-daemon status for the "
"volume" % volname)
return None
try:
root = etree.XML(out)
except etree.ParseError:
g.log.error("Failed to parse the volume status shd xml output.")
return None
operr = root.find("opErrstr")
if operr:
if "Self-heal Daemon is disabled for volume" in operr.text:
return True
return False
def are_all_self_heal_daemons_are_online(mnode, volname):
"""Verifies whether all the self-heal-daemons are online for the specified
volume.
Args:
mnode (str): Node on which cmd has to be executed.
volname (str): volume name
Returns:
bool : True if all the self-heal-daemons are online for the volume.
False otherwise.
NoneType: None if unable to get the volume status
"""
from glustolibs.gluster.volume_libs import is_distribute_volume
if is_distribute_volume(mnode, volname):
g.log.info("Volume %s is a distribute volume. "
"Hence not checking for self-heal daemons "
"to be online", volname)
return True
service = 'shd'
failure_msg = ("Verifying all self-heal-daemons are online failed for "
"volume %s" % volname)
# Get volume status
vol_status = get_volume_status(mnode=mnode, volname=volname,
service=service)
if vol_status is None:
g.log.error(failure_msg)
return None
# Get all nodes from pool list
from glustolibs.gluster.peer_ops import nodes_from_pool_list
all_nodes = nodes_from_pool_list(mnode)
if not all_nodes:
g.log.error(failure_msg)
return False
online_status = True
for node in all_nodes:
node_shd_status_value = (vol_status[volname][node]['Self-heal Daemon']
['status'])
if node_shd_status_value != '1':
online_status = False
g.run(mnode, ("gluster volume status %s shd" % volname))
if online_status is True:
g.log.info("All self-heal Daemons are online")
return True
else:
g.log.error("Some of the self-heal Daemons are offline")
return False
def monitor_heal_completion(mnode, volname, timeout_period=1200):
"""Monitors heal completion by looking into .glusterfs/indices/xattrop
directory of every brick for certain time. When there are no entries
in all the brick directories then heal is successful. Otherwise heal is
pending on the volume.
Args:
mnode : Node on which commands are executed
volname : Name of the volume
heal_monitor_timeout : time until which the heal monitoring to be done.
Default: 1200 i.e 20 minutes.
Return:
bool: True if heal is complete within timeout_period. False otherwise
"""
if timeout_period != 0:
heal_monitor_timeout = timeout_period
time_counter = heal_monitor_timeout
g.log.info("The heal monitoring timeout is : %d minutes" %
(heal_monitor_timeout / 60))
# Get all bricks
from glustolibs.gluster.brick_libs import get_all_bricks
bricks_list = get_all_bricks(mnode, volname)
if bricks_list is None:
g.log.error("Unable to get the bricks list. Hence unable to verify "
"whether self-heal-daemon process is running or not "
"on the volume %s" % volname)
return False
while time_counter > 0:
heal_complete = True
for brick in bricks_list:
brick_node, brick_path = brick.split(":")
cmd = ("ls -1 %s/.glusterfs/indices/xattrop/ | "
"grep -ve \"xattrop-\" | wc -l" % brick_path)
ret, out, err = g.run(brick_node, cmd)
if out.strip('\n') != "0":
heal_complete = False
if heal_complete:
break
else:
time.sleep(120)
time_counter = time_counter - 120
if heal_complete:
heal_completion_status = is_heal_complete(mnode, volname)
if heal_completion_status is True:
g.log.info("Heal has successfully completed on volume %s" %
volname)
return True
g.log.info("Heal has not yet completed on volume %s" % volname)
for brick in bricks_list:
brick_node, brick_path = brick.split(":")
cmd = ("ls -1 %s/.glusterfs/indices/xattrop/ " % brick_path)
g.run(brick_node, cmd)
return False
def is_heal_complete(mnode, volname):
"""Verifies there are no pending heals on the volume.
The 'number of entries' in the output of heal info
for all the bricks should be 0 for heal to be completed.
Args:
mnode : Node on which commands are executed
volname : Name of the volume
Return:
bool: True if heal is complete. False otherwise
"""
from glustolibs.gluster.heal_ops import get_heal_info
heal_info_data = get_heal_info(mnode, volname)
if heal_info_data is None:
g.log.error("Unable to verify whether heal is successful or not on "
"volume %s" % volname)
return False
heal_complete = True
for brick_heal_info_data in heal_info_data:
if brick_heal_info_data['numberOfEntries'] != '0':
heal_complete = False
if not heal_complete:
g.log.error("Heal is not complete on some of the bricks for the "
"volume %s" % volname)
return False
g.log.info("Heal is complete on all the bricks for the volume %s" %
volname)
return True
def is_volume_in_split_brain(mnode, volname):
"""Verifies there are no split-brain on the volume.
The 'number of entries' in the output of heal info split-brain
for all the bricks should be 0 for volume not to be in split-brain.
Args:
mnode : Node on which commands are executed
volname : Name of the volume
Return:
bool: True if volume is not in split-brain. False otherwise
"""
from glustolibs.gluster.heal_ops import get_heal_info_split_brain
heal_info_split_brain_data = get_heal_info_split_brain(mnode, volname)
if heal_info_split_brain_data is None:
g.log.error("Unable to verify whether volume %s is not in split-brain "
"or not" % volname)
return False
split_brain = False
for brick_heal_info_split_brain_data in heal_info_split_brain_data:
if brick_heal_info_split_brain_data['numberOfEntries'] == '-':
continue
if brick_heal_info_split_brain_data['numberOfEntries'] != '0':
split_brain = True
if split_brain:
g.log.error("Volume %s is in split-brain state." % volname)
return True
g.log.info("Volume %s is not in split-brain state." % volname)
return False
def get_unhealed_entries_info(volname, mnode=''):
"""Get the information of all gfid's on which heal is pending. The
information includes - stat of gfid, getfattr output for all the dirs/
files for a given gfid
Args:
mnode : Node on which commands are executed
volname : Name of the volume
Return:
bool: True if getting unhealed entries info is successful.
False otherwise
"""
return True
def wait_for_self_heal_daemons_to_be_online(mnode, volname, timeout=300):
"""Waits for the volume self-heal-daemons to be online until timeout
Args:
mnode (str): Node on which commands will be executed.
volname (str): Name of the volume.
Kwargs:
timeout (int): timeout value in seconds to wait for self-heal-daemons
to be online.
Returns:
True if all self-heal-daemons are online within timeout,
False otherwise
"""
from glustolibs.gluster.volume_libs import is_distribute_volume
if is_distribute_volume(mnode, volname):
g.log.info("Volume %s is a distribute volume. "
"Hence not waiting for self-heal daemons "
"to be online", volname)
return True
counter = 0
flag = 0
while counter < timeout:
status = are_all_self_heal_daemons_are_online(mnode, volname)
if status:
flag = 1
break
if not status:
time.sleep(10)
counter = counter + 10
if not flag:
g.log.error("All self-heal-daemons of the volume '%s' are not online "
"even after %d minutes" % (volname, timeout/60.0))
return False
else:
g.log.info("All self-heal-daemons of the volume '%s' are online ",
volname)
return True
def get_self_heal_daemon_pid(nodes):
"""
Checks if self-heal daemon process is running and
return the process id's in dictionary format
Args:
nodes ( str|list ) : Node/Nodes of the cluster
Returns:
tuple : Tuple containing two elements (ret, glustershd_pids).
The first element 'ret' is of type 'bool', True if and only if
glustershd is running on all the nodes in the list and each
node contains only one instance of glustershd running.
False otherwise.
The second element 'glustershd_pids' is of type dictonary and it
contains the process ID's for glustershd
"""
glustershd_pids = {}
_rc = True
if not isinstance(nodes, list):
nodes = [nodes]
cmd = r"pgrep -f glustershd | grep -v ^$$\$"
g.log.info("Executing cmd: %s on node %s" % (cmd, nodes))
results = g.run_parallel(nodes, cmd)
for node in results:
ret, out, err = results[node]
if ret == 0:
if len(out.strip().split("\n")) == 1:
if not out.strip():
g.log.error("NO self heal daemon process found "
"on node %s" % node)
_rc = False
glustershd_pids[node] = [-1]
else:
g.log.info("Single Self Heal Daemon process with "
"pid %s found on %s",
out.strip().split("\n"), node)
glustershd_pids[node] = (out.strip().split("\n"))
else:
g.log.error("More than One self heal daemon process "
"found on node %s" % node)
_rc = False
glustershd_pids[node] = [-1]
else:
g.log.error("Not able to get self heal daemon process "
"from node %s" % node)
_rc = False
glustershd_pids[node] = [-1]
return _rc, glustershd_pids
def do_bricks_exist_in_shd_volfile(mnode, volname, brick_list):
"""
Checks whether the given brick list is present in glustershd
server volume file
Args:
mnode (str) : Node on which commands will be executed.
volname (str) : Name of the volume.
brick_list ( list ) : brick list of a volume which needs to
compare in glustershd server volume file
Returns:
bool : True if brick exists in glustershd server volume file.
False Otherwise
"""
GLUSTERSHD = "/var/lib/glusterd/glustershd/glustershd-server.vol"
brick_list_server_vol = []
volume_clients = "volume " + volname + "-client-"
host = brick = None
parse = False
# Establish connection to mnode
conn = g.rpyc_get_connection(mnode)
if conn is None:
g.log.info("Not able to establish connection to node %s" % mnode)
return False
try:
fd = conn.builtins.open(GLUSTERSHD)
for each_line in fd:
each_line = each_line.strip()
if volume_clients in each_line:
parse = True
elif "end-volume" in each_line:
if parse:
brick_list_server_vol.append("%s:%s" % (host, brick))
parse = False
elif parse:
if "option remote-subvolume" in each_line:
brick = each_line.split(" ")[2]
if "option remote-host" in each_line:
host = each_line.split(" ")[2]
except IOError as e:
g.log.info("I/O error ({0}): {1}".format(e.errno, e.strerror))
return False
g.log.info("Brick List from volume info : %s" % brick_list)
g.log.info("Brick List from glustershd server volume "
"file : %s" % brick_list_server_vol)
if set(brick_list) != set(brick_list_server_vol):
return False
return True
def is_shd_daemonized(nodes, timeout=120):
"""
wait for the glustershd process to release parent process.
Args:
nodes ( str|list ) : Node/Nodes of the cluster
Kwargs:
timeout (int): timeout value in seconds to wait for self-heal-daemons
to be online.
Returns:
bool : True if glustershd releases its parent.
False Otherwise
"""
counter = 0
flag = 0
if not isinstance(nodes, list):
nodes = [nodes]
while counter < timeout:
ret, pids = get_self_heal_daemon_pid(nodes)
if not ret:
g.log.info("Retry after 3 sec to get self heal "
"daemon process....")
time.sleep(3)
counter = counter + 3
else:
flag = 1
break
if not flag:
g.log.error("Either No self heal daemon process found or more than"
"One self heal daemon process found even "
"after %d minutes", (timeout/60.0))
return False
else:
g.log.info("Single self heal daemon process on all nodes %s",
nodes)
return True
def bring_self_heal_daemon_process_offline(nodes):
"""
Bring the self-heal daemon process offline for the nodes
Args:
nodes ( str|list ) : Node/Nodes of the cluster to bring
self-heal daemon process offline
Returns:
bool : True on successfully bringing self-heal daemon process offline.
False otherwise
"""
if not isinstance(nodes, list):
nodes = [nodes]
failed_nodes = []
_rc = True
g.log.info("Starting to get self heal daemon process on nodes %s" % nodes)
ret, pids = get_self_heal_daemon_pid(nodes)
if not ret:
g.log.error("Either no self heal daemon process found or more than"
" one self heal daemon process found : %s" % pids)
return False
g.log.info("Successful in getting single self heal daemon process"
" on all nodes %s", nodes)
for node in pids:
pid = pids[node][0]
kill_cmd = "kill -SIGKILL %s" % pid
ret, _, _ = g.run(node, kill_cmd)
if ret != 0:
g.log.error("Unable to kill the self heal daemon "
"process on %s" % node)
failed_nodes.append(node)
if failed_nodes:
g.log.info("Unable to kill the self heal daemon "
"process on nodes %s" % nodes)
_rc = False
return _rc
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