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Finish up Ceph OSD removal, add locking to commands

This commit is contained in:
Joshua Boniface 2018-10-30 22:41:44 -04:00
parent 89a3e0c7ee
commit 3e4a6086d5
6 changed files with 200 additions and 44 deletions
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49
client-common/ceph.py
View File

@ -23,6 +23,7 @@
import re
import click
import ast
import time
import client_lib.ansiprint as ansiprint
import client_lib.zkhandler as zkhandler
@ -90,7 +91,14 @@ def formatOSDList(zk_conn, osd_list):
osd_stats = getOSDInformation(zk_conn, osd)
# Set the parent node and length
osd_node[osd] = osd_stats['node']
try:
osd_node[osd] = osd_stats['node']
# If this happens, the node hasn't checked in fully yet, so just ignore it
if osd_node[osd] == '|':
continue
except KeyError:
continue
_osd_node_length = len(osd_node[osd]) + 1
if _osd_node_length > osd_node_length:
osd_node_length = _osd_node_length
@ -247,20 +255,51 @@ def get_status(zk_conn):
return True, ''
def add_osd(zk_conn, node, device):
# Verify the target node exists
if not common.verifyNode(zk_conn, node):
return False, 'ERROR: No node named "{}" is present in the cluster.'.format(node)
# Tell the cluster to create a new OSD for the host
add_osd_string = 'add {},{}'.format(node, device)
zkhandler.writedata(zk_conn, {'/ceph/osd_cmd': add_osd_string})
click.echo('Created new OSD with block device {} on node {}.'.format(device, node))
return True, ''
# Wait 1/2 second for the cluster to get the message and start working
time.sleep(0.5)
# Acquire a read lock, so we get the return exclusively
lock = zkhandler.readlock(zk_conn, '/ceph/osd_cmd')
with lock:
result = zkhandler.readdata(zk_conn, '/ceph/osd_cmd').split()[0]
if result == 'success-add':
success = True
else:
success = False
if success:
return True, 'Created new OSD with block device {} on node {}.'.format(device, node)
else:
return False, 'Failed to create new OSD; check node logs for details.'
def remove_osd(zk_conn, osd_id):
if not common.verifyOSD(zk_conn, osd_id):
return False, 'ERROR: No OSD with ID "{}" is present in the cluster.'.format(osd_id)
# Tell the cluster to remove an OSD
remove_osd_string = 'remove {}'.format(osd_id)
zkhandler.writedata(zk_conn, {'/ceph/osd_cmd': remove_osd_string})
click.echo('Removed OSD with ID {} from the cluster.'.format(osd_id))
return True, ''
# Wait 1/2 second for the cluster to get the message and start working
time.sleep(0.5)
# Acquire a read lock, so we get the return exclusively
lock = zkhandler.readlock(zk_conn, '/ceph/osd_cmd')
with lock:
result = zkhandler.readdata(zk_conn, '/ceph/osd_cmd').split()[0]
if result == 'success-remove':
success = True
else:
success = False
if success:
return True, 'Removed OSD {} from the cluster.'.format(osd_id)
else:
return False, 'Failed to remove OSD; check node logs for details.'
def get_list_osd(zk_conn, limit):
osd_list = []

9
client-common/common.py
View File

@ -175,6 +175,15 @@ def verifyNode(zk_conn, node):
else:
return False
#
# Verify OSD is valid in cluster
#
def verifyOSD(zk_conn, osd_id):
if zkhandler.exists(zk_conn, '/ceph/osds/{}'.format(osd_id)):
return True
else:
return False
#
# Get the primary coordinator node
#

18
client-common/zkhandler.py
View File

@ -21,6 +21,8 @@
###############################################################################
import kazoo.client
import uuid
import client_lib.ansiprint as ansiprint
# Exists function
@ -38,10 +40,7 @@ def listchildren(zk_conn, key):
# Delete key function
def deletekey(zk_conn, key, recursive=True):
try:
zk_conn.delete(key, recursive=recursive)
except:
pass
zk_conn.delete(key, recursive=recursive)
# Data read function
def readdata(zk_conn, key):
@ -88,3 +87,14 @@ def writedata(zk_conn, kv):
except Exception:
return False
# Write lock function
def writelock(zk_conn, key):
lock_id = str(uuid.uuid1())
lock = zk_conn.WriteLock('{}'.format(key), lock_id)
return lock
# Read lock function
def readlock(zk_conn, key):
lock_id = str(uuid.uuid1())
lock = zk_conn.ReadLock('{}'.format(key), lock_id)
return lock

101
node-daemon/pvcd/CephInstance.py
View File

@ -22,6 +22,8 @@
import time
import ast
import json
import psutil
import pvcd.log as log
import pvcd.zkhandler as zkhandler
@ -53,7 +55,7 @@ class CephOSDInstance(object):
except AttributeError:
data = ''
if data != self.node:
if data and data != self.node:
self.node = data
@self.zk_conn.DataWatch('/ceph/osds/{}/stats'.format(self.osd_id))
@ -68,8 +70,8 @@ class CephOSDInstance(object):
except AttributeError:
data = ''
if data != self.stats:
self.stats = dict(ast.literal_eval(data))
if data and data != self.stats:
self.stats = json.loads(data)
def add_osd(zk_conn, logger, node, device):
# We are ready to create a new OSD on this node
@ -77,7 +79,8 @@ def add_osd(zk_conn, logger, node, device):
try:
# 1. Create an OSD; we do this so we know what ID will be gen'd
retcode, stdout, stderr = common.run_os_command('ceph osd create')
if retcode != 0:
if retcode:
print('ceph osd create')
print(stdout)
print(stderr)
raise
@ -85,7 +88,8 @@ def add_osd(zk_conn, logger, node, device):
# 2. Remove that newly-created OSD
retcode, stdout, stderr = common.run_os_command('ceph osd rm {}'.format(osd_id))
if retcode != 0:
if retcode:
print('ceph osd rm')
print(stdout)
print(stderr)
raise
@ -97,7 +101,8 @@ def add_osd(zk_conn, logger, node, device):
device=device
)
)
if retcode != 0:
if retcode:
print('ceph-volume lvm prepare')
print(stdout)
print(stderr)
raise
@ -108,7 +113,8 @@ def add_osd(zk_conn, logger, node, device):
osdid=osd_id
)
)
if retcode != 0:
if retcode:
print('ceph-volume lvm activate')
print(stdout)
print(stderr)
raise
@ -120,7 +126,8 @@ def add_osd(zk_conn, logger, node, device):
node=node
)
)
if retcode != 0:
if retcode:
print('ceph osd crush add')
print(stdout)
print(stderr)
raise
@ -132,7 +139,8 @@ def add_osd(zk_conn, logger, node, device):
osdid=osd_id
)
)
if retcode != 0:
if retcode:
print('systemctl status')
print(stdout)
print(stderr)
raise
@ -141,15 +149,16 @@ def add_osd(zk_conn, logger, node, device):
zkhandler.writedata(zk_conn, {
'/ceph/osds/{}'.format(osd_id): '',
'/ceph/osds/{}/node'.format(osd_id): node,
'/ceph/osds/{}/size'.format(osd_id): '',
'/ceph/osds/{}/stats'.format(osd_id): '{}'
})
# Log it
logger.out('Created new OSD disk with ID {}'.format(osd_id), state='o')
return True
except Exception as e:
# Log it
logger.out('Failed to create new OSD disk: {}'.format(e), state='e')
return False
def remove_osd(zk_conn, logger, osd_id, osd_obj):
logger.out('Removing OSD disk {}'.format(osd_id), state='i')
@ -163,16 +172,78 @@ def remove_osd(zk_conn, logger, osd_id, osd_obj):
# 1. Set the OSD out so it will flush
retcode, stdout, stderr = common.run_os_command('ceph osd out {}'.format(osd_id))
if retcode != 0:
if retcode:
print('ceph osd out')
print(stdout)
print(stderr)
raise
# 2. Wait for the OSD to flush
osd_string = str()
while True:
retcode, stdout, stderr = common.run_os_command('ceph health')
health_string = stdout
except:
pass
retcode, stdout, stderr = common.run_os_command('ceph pg dump osds --format json')
dump_string = json.loads(stdout)
for osd in dump_string:
if str(osd['osd']) == osd_id:
osd_string = osd
print(osd_string)
num_pgs = osd_string['num_pgs']
if num_pgs > 0:
time.sleep(5)
else:
break
# 3. Stop the OSD process and wait for it to be terminated
retcode, stdout, stderr = common.run_os_command('systemctl stop ceph-osd@{}'.format(osd_id))
if retcode:
print('systemctl stop')
print(stdout)
print(stderr)
raise
# FIXME: There has to be a better way to do this /shrug
while True:
is_osd_up = False
# Find if there is a process named ceph-osd with arg '--id {id}'
for p in psutil.process_iter(attrs=['name', 'cmdline']):
if 'ceph-osd' == p.info['name'] and '--id {}'.format(osd_id) in ' '.join(p.info['cmdline']):
is_osd_up = True
# If there isn't, continue
if not is_osd_up:
break
# 4. Delete OSD from ZK
zkhandler.deletekey(zk_conn, '/ceph/osds/{}'.format(osd_id))
# 5. Determine the block devices
retcode, stdout, stderr = common.run_os_command('readlink /var/lib/ceph/osd/ceph-{}/block'.format(osd_id))
vg_name = stdout.split('/')[-2] # e.g. /dev/ceph-<uuid>/osd-block-<uuid>
retcode, stdout, stderr = common.run_os_command('vgs --separator , --noheadings -o pv_name {}'.format(vg_name))
pv_block = stdout
# 6. Zap the volumes
retcode, stdout, stderr = common.run_os_command('ceph-volume lvm zap --destroy {}'.format(pv_block))
if retcode:
print('ceph-volume lvm zap')
print(stdout)
print(stderr)
raise
# 7. Purge the OSD from Ceph
retcode, stdout, stderr = common.run_os_command('ceph osd purge {} --yes-i-really-mean-it'.format(osd_id))
if retcode:
print('ceph osd purge')
print(stdout)
print(stderr)
raise
# Log it
logger.out('Purged OSD disk with ID {}'.format(osd_id), state='o')
return True
except Exception as e:
# Log it
logger.out('Failed to purge OSD disk with ID {}: {}'.format(osd_id, e), state='e')
return False
class CephPool(object):
def __init__(self):

44
node-daemon/pvcd/Daemon.py
View File

@ -308,7 +308,7 @@ def zk_listener(state):
# Start keepalive thread
if update_timer:
update_timer = createKeepaliveTimer()
update_timer = startKeepaliveTimer()
else:
pass
zk_conn.add_listener(zk_listener)
@ -669,23 +669,38 @@ def osd_cmd(data, stat, event=''):
if command == 'add':
node, device = args.split(',')
if node == this_node.name:
# Clean up the command queue
zkhandler.writedata(zk_conn, {'/ceph/osd_cmd': ''})
# Add the OSD
CephInstance.add_osd(zk_conn, logger, node, device)
# Lock the command queue
lock = zkhandler.writelock(zk_conn, '/ceph/osd_cmd')
with lock:
# Add the OSD
result = CephInstance.add_osd(zk_conn, logger, node, device)
# Command succeeded
if result:
# Update the command queue
zkhandler.writedata(zk_conn, {'/ceph/osd_cmd': 'success-{}'.format(data)})
# Command failed
else:
# Update the command queue
zkhandler.writedata(zk_conn, {'/ceph/osd_cmd': 'failure-{}'.format(data)})
# Removing an OSD
elif command == 'remove':
osd_id = args
# Verify osd_id is in the list
if not d_osd[osd_id]:
return True
if d_osd[osd_id].node == this_node.name:
# Clean up the command queue
zkhandler.writedata(zk_conn, {'/ceph/osd_cmd': ''})
# Remove the OSD
CephInstance.remove_osd(zk_conn, logger, osd_id, d_osd[osd_id])
if d_osd[osd_id] and d_osd[osd_id].node == this_node.name:
# Lock the command queue
lock = zkhandler.writelock(zk_conn, '/ceph/osd_cmd')
with lock:
# Remove the OSD
result = CephInstance.remove_osd(zk_conn, logger, osd_id, d_osd[osd_id])
# Command succeeded
if result:
# Update the command queue
zkhandler.writedata(zk_conn, {'/ceph/osd_cmd': 'success-{}'.format(data)})
# Command failed
else:
# Update the command queue
zkhandler.writedata(zk_conn, {'/ceph/osd_cmd': 'failure-{}'.format(data)})
# OSD objects
@zk_conn.ChildrenWatch('/ceph/osds')
@ -784,7 +799,6 @@ def update_zookeeper():
rd_data = line[15]
state = line[17]
osd_status.update({
# osd_stats.update({
str(osd_id): {
'node': node,
'used': used,
@ -808,7 +822,7 @@ def update_zookeeper():
for osd in osd_list:
if d_osd[osd].node == myhostname:
zkhandler.writedata(zk_conn, {
'/ceph/osds/{}/stats'.format(osd): str(osd_stats[osd])
'/ceph/osds/{}/stats'.format(osd): str(json.dumps(osd_stats[osd]))
})
osds_this_node += 1

23
node-daemon/pvcd/zkhandler.py
View File

@ -21,7 +21,9 @@
###############################################################################
import kazoo.client
import pvcd.log as log
import uuid
#import pvcd.log as log
# Child list function
def listchildren(zk_conn, key):
@ -29,8 +31,8 @@ def listchildren(zk_conn, key):
return children
# Key deletion function
def delete(zk_conn, key):
zk_conn.delete(key, recursive=True)
def deletekey(zk_conn, key, recursive=True):
zk_conn.delete(key, recursive=recursive)
# Data read function
def readdata(zk_conn, key):
@ -53,7 +55,7 @@ def writedata(zk_conn, kv):
# Check if this key already exists or not
if not zk_conn.exists(key):
# We're creating a new key
zk_transaction.create(key, data.encode('ascii'))
zk_transaction.create(key, str(data).encode('ascii'))
else:
# We're updating a key with version validation
orig_data = zk_conn.get(key)
@ -63,7 +65,7 @@ def writedata(zk_conn, kv):
new_version = version + 1
# Update the data
zk_transaction.set_data(key, data.encode('ascii'))
zk_transaction.set_data(key, str(data).encode('ascii'))
# Set up the check
try:
@ -79,3 +81,14 @@ def writedata(zk_conn, kv):
except Exception:
return False
# Write lock function
def writelock(zk_conn, key):
lock_id = str(uuid.uuid1())
lock = zk_conn.WriteLock('{}'.format(key), lock_id)
return lock
# Read lock function
def readlock(zk_conn, key):
lock_id = str(uuid.uuid1())
lock = zk_conn.ReadLock('{}'.format(key), lock_id)
return lock