pvc/node-daemon/pvcd/CephInstance.py

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#!/usr/bin/env python3
# CehpInstance.py - Class implementing a PVC node Ceph instance
# Part of the Parallel Virtual Cluster (PVC) system
#
# Copyright (C) 2018 Joshua M. Boniface <joshua@boniface.me>
#
# 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 3 of the License, or
# (at your option) 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, see <https://www.gnu.org/licenses/>.
#
###############################################################################
import time
import ast
import json
import psutil
import pvcd.log as log
import pvcd.zkhandler as zkhandler
import pvcd.common as common
class CephOSDInstance(object):
def __init__(self, zk_conn, this_node, osd_id):
self.zk_conn = zk_conn
self.this_node = this_node
self.osd_id = osd_id
self.node = None
self.size = None
self.stats = dict()
@self.zk_conn.DataWatch('/ceph/osds/{}/node'.format(self.osd_id))
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def watch_osd_node(data, stat, event=''):
if event and event.type == 'DELETED':
# The key has been deleted after existing before; terminate this watcher
# because this class instance is about to be reaped in Daemon.py
return False
try:
data = data.decode('ascii')
except AttributeError:
data = ''
if data and data != self.node:
self.node = data
@self.zk_conn.DataWatch('/ceph/osds/{}/stats'.format(self.osd_id))
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def watch_osd_stats(data, stat, event=''):
if event and event.type == 'DELETED':
# The key has been deleted after existing before; terminate this watcher
# because this class instance is about to be reaped in Daemon.py
return False
try:
data = data.decode('ascii')
except AttributeError:
data = ''
if data and data != self.stats:
self.stats = json.loads(data)
def add_osd(zk_conn, logger, node, device, weight):
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# We are ready to create a new OSD on this node
logger.out('Creating new OSD disk', state='i')
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:
print('ceph osd create')
print(stdout)
print(stderr)
raise
osd_id = stdout.rstrip()
# 2. Remove that newly-created OSD
retcode, stdout, stderr = common.run_os_command('ceph osd rm {}'.format(osd_id))
if retcode:
print('ceph osd rm')
print(stdout)
print(stderr)
raise
# 3. Create the OSD for real
retcode, stdout, stderr = common.run_os_command(
'ceph-volume lvm prepare --bluestore --data {device}'.format(
osdid=osd_id,
device=device
)
)
if retcode:
print('ceph-volume lvm prepare')
print(stdout)
print(stderr)
raise
# 4. Activate the OSD
retcode, stdout, stderr = common.run_os_command(
'ceph-volume lvm activate --bluestore {osdid}'.format(
osdid=osd_id
)
)
if retcode:
print('ceph-volume lvm activate')
print(stdout)
print(stderr)
raise
# 5. Add it to the crush map
retcode, stdout, stderr = common.run_os_command(
'ceph osd crush add osd.{osdid} {weight} root=default host={node}'.format(
osdid=osd_id,
weight=weight,
node=node
)
)
if retcode:
print('ceph osd crush add')
print(stdout)
print(stderr)
raise
time.sleep(0.5)
# 6. Verify it started
retcode, stdout, stderr = common.run_os_command(
'systemctl status ceph-osd@{osdid}'.format(
osdid=osd_id
)
)
if retcode:
print('systemctl status')
print(stdout)
print(stderr)
raise
# 7. Add the new OSD to the list
zkhandler.writedata(zk_conn, {
'/ceph/osds/{}'.format(osd_id): '',
'/ceph/osds/{}/node'.format(osd_id): node,
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'/ceph/osds/{}/device'.format(osd_id): device,
'/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')
try:
# 1. Verify the OSD is present
retcode, stdout, stderr = common.run_os_command('ceph osd ls')
osd_list = stdout.split('\n')
if not osd_id in osd_list:
logger.out('Could not find OSD {} in the cluster'.format(osd_id), state='e')
return True
# 1. Set the OSD out so it will flush
retcode, stdout, stderr = common.run_os_command('ceph osd out {}'.format(osd_id))
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 pg dump osds --format json')
dump_string = json.loads(stdout)
for osd in dump_string:
if str(osd['osd']) == osd_id:
osd_string = osd
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
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def in_osd(zk_conn, logger, osd_id):
# We are ready to create a new pool on this node
logger.out('Setting OSD {} in'.format(osd_id), state='i')
try:
# 1. Set it in
retcode, stdout, stderr = common.run_os_command('ceph osd in {}'.format(osd_id))
if retcode:
print('ceph osd in')
print(stdout)
print(stderr)
raise
# Log it
logger.out('Set OSD {} in'.format(osd_id), state='o')
return True
except Exception as e:
# Log it
logger.out('Failed to set OSD {} in: {}'.format(osd_id, e), state='e')
return False
def out_osd(zk_conn, logger, osd_id):
# We are ready to create a new pool on this node
logger.out('Settoutg OSD {} out'.format(osd_id), state='i')
try:
# 1. Set it out
retcode, stdout, stderr = common.run_os_command('ceph osd out {}'.format(osd_id))
if retcode:
proutt('ceph osd out')
proutt(stdout)
proutt(stderr)
raise
# Log it
logger.out('Set OSD {} out'.format(osd_id), state='o')
return True
except Exception as e:
# Log it
logger.out('Failed to set OSD {} out: {}'.format(osd_id, e), state='e')
return False
def set_property(zk_conn, logger, option):
# We are ready to create a new pool on this node
logger.out('Setting OSD property {}'.format(option), state='i')
try:
# 1. Set it in
retcode, stdout, stderr = common.run_os_command('ceph osd set {}'.format(option))
if retcode:
prsett('ceph osd set')
print(stdout)
print(stderr)
raise
# Log it
logger.out('Set OSD property {}'.format(option), state='o')
return True
except Exception as e:
# Log it
logger.out('Failed to set OSD property {}: {}'.format(option, e), state='e')
return False
def unset_property(zk_conn, logger, option):
# We are ready to create a new pool on this node
logger.out('Unsetting OSD property {}'.format(option), state='i')
try:
# 1. Set it in
retcode, stdout, stderr = common.run_os_command('ceph osd unset {}'.format(option))
if retcode:
prunsett('ceph osd unset')
print(stdout)
print(stderr)
raise
# Log it
logger.out('Unset OSD property {}'.format(option), state='o')
return True
except Exception as e:
# Log it
logger.out('Failed to unset OSD property {}: {}'.format(option, e), state='e')
return False
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class CephPoolInstance(object):
def __init__(self, zk_conn, this_node, name):
self.zk_conn = zk_conn
self.this_node = this_node
self.name = name
self.pgs = ''
self.stats = dict()
@self.zk_conn.DataWatch('/ceph/pools/{}/pgs'.format(self.name))
def watch_pool_node(data, stat, event=''):
if event and event.type == 'DELETED':
# The key has been deleted after existing before; terminate this watcher
# because this class instance is about to be reaped in Daemon.py
return False
try:
data = data.decode('ascii')
except AttributeError:
data = ''
if data and data != self.pgs:
self.pgs = data
@self.zk_conn.DataWatch('/ceph/pools/{}/stats'.format(self.name))
def watch_pool_stats(data, stat, event=''):
if event and event.type == 'DELETED':
# The key has been deleted after existing before; terminate this watcher
# because this class instance is about to be reaped in Daemon.py
return False
try:
data = data.decode('ascii')
except AttributeError:
data = ''
if data and data != self.stats:
self.stats = json.loads(data)
def add_pool(zk_conn, logger, name, pgs):
# We are ready to create a new pool on this node
logger.out('Creating new RBD pool {}'.format(name), state='i')
try:
# 1. Create the pool
retcode, stdout, stderr = common.run_os_command('ceph osd pool create {} {} replicated'.format(name, pgs))
if retcode:
print('ceph osd pool create')
print(stdout)
print(stderr)
raise
# 2. Enable RBD application
retcode, stdout, stderr = common.run_os_command('ceph osd pool application enable {} rbd'.format(name))
if retcode:
print('ceph osd pool application enable')
print(stdout)
print(stderr)
raise
# 3. Add the new pool to ZK
zkhandler.writedata(zk_conn, {
'/ceph/pools/{}'.format(name): '',
'/ceph/pools/{}/pgs'.format(name): pgs,
'/ceph/pools/{}/stats'.format(name): '{}'
})
# Log it
logger.out('Created new RBD pool {}'.format(name), state='o')
return True
except Exception as e:
# Log it
logger.out('Failed to create new RBD pool {}: {}'.format(name, e), state='e')
return False
def remove_pool(zk_conn, logger, name):
# We are ready to create a new pool on this node
logger.out('Removing RBD pool {}'.format(name), state='i')
try:
# Delete pool from ZK
zkhandler.deletekey(zk_conn, '/ceph/pools/{}'.format(name))
# Remove the pool
retcode, stdout, stderr = common.run_os_command('ceph osd pool rm {pool} {pool} --yes-i-really-really-mean-it'.format(pool=name))
if retcode:
print('ceph osd pool rm')
print(stdout)
print(stderr)
raise
# Log it
logger.out('Removed RBD pool {}'.format(name), state='o')
return True
except Exception as e:
# Log it
logger.out('Failed to remove RBD pool {}: {}'.format(name, e), state='e')
return False