417 lines
15 KiB
Python
417 lines
15 KiB
Python
#!/usr/bin/env python3
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# CephInstance.py - Class implementing a PVC node Ceph instance
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# Part of the Parallel Virtual Cluster (PVC) system
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#
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# Copyright (C) 2018-2020 Joshua M. Boniface <joshua@boniface.me>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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#
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###############################################################################
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import time
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import json
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import psutil
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import pvcnoded.log as log
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import pvcnoded.zkhandler as zkhandler
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import pvcnoded.common as common
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class CephOSDInstance(object):
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def __init__(self, zk_conn, this_node, osd_id):
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self.zk_conn = zk_conn
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self.this_node = this_node
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self.osd_id = osd_id
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self.node = None
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self.size = None
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self.stats = dict()
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@self.zk_conn.DataWatch('/ceph/osds/{}/node'.format(self.osd_id))
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def watch_osd_node(data, stat, event=''):
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if event and event.type == 'DELETED':
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# The key has been deleted after existing before; terminate this watcher
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# because this class instance is about to be reaped in Daemon.py
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return False
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try:
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data = data.decode('ascii')
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except AttributeError:
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data = ''
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if data and data != self.node:
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self.node = data
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@self.zk_conn.DataWatch('/ceph/osds/{}/stats'.format(self.osd_id))
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def watch_osd_stats(data, stat, event=''):
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if event and event.type == 'DELETED':
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# The key has been deleted after existing before; terminate this watcher
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# because this class instance is about to be reaped in Daemon.py
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return False
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try:
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data = data.decode('ascii')
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except AttributeError:
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data = ''
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if data and data != self.stats:
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self.stats = json.loads(data)
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def add_osd(zk_conn, logger, node, device, weight):
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# We are ready to create a new OSD on this node
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logger.out('Creating new OSD disk on block device {}'.format(device), state='i')
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try:
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# 1. Create an OSD; we do this so we know what ID will be gen'd
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retcode, stdout, stderr = common.run_os_command('ceph osd create')
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if retcode:
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print('ceph osd create')
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print(stdout)
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print(stderr)
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raise
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osd_id = stdout.rstrip()
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# 2. Remove that newly-created OSD
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retcode, stdout, stderr = common.run_os_command('ceph osd rm {}'.format(osd_id))
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if retcode:
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print('ceph osd rm')
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print(stdout)
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print(stderr)
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raise
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# 3a. Zap the disk to ensure it is ready to go
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logger.out('Zapping disk {}'.format(device), state='i')
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retcode, stdout, stderr = common.run_os_command('ceph-volume lvm zap --destroy {}'.format(device))
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if retcode:
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print('ceph-volume lvm zap')
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print(stdout)
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print(stderr)
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raise
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# 3b. Create the OSD for real
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logger.out('Preparing LVM for new OSD disk with ID {} on {}'.format(osd_id, device), state='i')
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retcode, stdout, stderr = common.run_os_command(
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'ceph-volume lvm prepare --bluestore --data {device}'.format(
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osdid=osd_id,
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device=device
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)
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)
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if retcode:
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print('ceph-volume lvm prepare')
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print(stdout)
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print(stderr)
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raise
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# 4a. Get OSD FSID
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logger.out('Getting OSD FSID for ID {} on {}'.format(osd_id, device), state='i')
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retcode, stdout, stderr = common.run_os_command(
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'ceph-volume lvm list {device}'.format(
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osdid=osd_id,
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device=device
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)
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)
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for line in stdout.split('\n'):
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if 'osd fsid' in line:
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osd_fsid = line.split()[-1]
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if not osd_fsid:
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print('ceph-volume lvm list')
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print('Could not find OSD fsid in data:')
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print(stdout)
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print(stderr)
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raise
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# 4b. Activate the OSD
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logger.out('Activating new OSD disk with ID {}'.format(osd_id, device), state='i')
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retcode, stdout, stderr = common.run_os_command(
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'ceph-volume lvm activate --bluestore {osdid} {osdfsid}'.format(
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osdid=osd_id,
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osdfsid=osd_fsid
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)
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)
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if retcode:
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print('ceph-volume lvm activate')
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print(stdout)
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print(stderr)
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raise
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# 5. Add it to the crush map
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logger.out('Adding new OSD disk with ID {} to CRUSH map'.format(osd_id), state='i')
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retcode, stdout, stderr = common.run_os_command(
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'ceph osd crush add osd.{osdid} {weight} root=default host={node}'.format(
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osdid=osd_id,
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weight=weight,
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node=node
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)
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)
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if retcode:
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print('ceph osd crush add')
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print(stdout)
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print(stderr)
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raise
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time.sleep(0.5)
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# 6. Verify it started
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retcode, stdout, stderr = common.run_os_command(
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'systemctl status ceph-osd@{osdid}'.format(
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osdid=osd_id
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)
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)
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if retcode:
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print('systemctl status')
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print(stdout)
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print(stderr)
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raise
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# 7. Add the new OSD to the list
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logger.out('Adding new OSD disk with ID {} to Zookeeper'.format(osd_id), state='i')
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zkhandler.writedata(zk_conn, {
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'/ceph/osds/{}'.format(osd_id): '',
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'/ceph/osds/{}/node'.format(osd_id): node,
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'/ceph/osds/{}/device'.format(osd_id): device,
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'/ceph/osds/{}/stats'.format(osd_id): '{}'
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})
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# Log it
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logger.out('Created new OSD disk with ID {}'.format(osd_id), state='o')
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return True
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except Exception as e:
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# Log it
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logger.out('Failed to create new OSD disk: {}'.format(e), state='e')
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return False
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def remove_osd(zk_conn, logger, osd_id, osd_obj):
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logger.out('Removing OSD disk {}'.format(osd_id), state='i')
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try:
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# 1. Verify the OSD is present
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retcode, stdout, stderr = common.run_os_command('ceph osd ls')
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osd_list = stdout.split('\n')
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if not osd_id in osd_list:
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logger.out('Could not find OSD {} in the cluster'.format(osd_id), state='e')
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return True
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# 1. Set the OSD out so it will flush
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logger.out('Setting out OSD disk with ID {}'.format(osd_id), state='i')
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retcode, stdout, stderr = common.run_os_command('ceph osd out {}'.format(osd_id))
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if retcode:
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print('ceph osd out')
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print(stdout)
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print(stderr)
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raise
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# 2. Wait for the OSD to flush
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logger.out('Flushing OSD disk with ID {}'.format(osd_id), state='i')
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osd_string = str()
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while True:
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try:
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retcode, stdout, stderr = common.run_os_command('ceph pg dump osds --format json')
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dump_string = json.loads(stdout)
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for osd in dump_string:
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if str(osd['osd']) == osd_id:
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osd_string = osd
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num_pgs = osd_string['num_pgs']
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if num_pgs > 0:
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time.sleep(5)
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else:
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raise
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except Exception:
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break
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# 3. Stop the OSD process and wait for it to be terminated
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logger.out('Stopping OSD disk with ID {}'.format(osd_id), state='i')
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retcode, stdout, stderr = common.run_os_command('systemctl stop ceph-osd@{}'.format(osd_id))
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if retcode:
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print('systemctl stop')
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print(stdout)
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print(stderr)
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raise
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# FIXME: There has to be a better way to do this /shrug
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while True:
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is_osd_up = False
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# Find if there is a process named ceph-osd with arg '--id {id}'
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for p in psutil.process_iter(attrs=['name', 'cmdline']):
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if 'ceph-osd' == p.info['name'] and '--id {}'.format(osd_id) in ' '.join(p.info['cmdline']):
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is_osd_up = True
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# If there isn't, continue
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if not is_osd_up:
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break
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# 4. Determine the block devices
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retcode, stdout, stderr = common.run_os_command('readlink /var/lib/ceph/osd/ceph-{}/block'.format(osd_id))
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vg_name = stdout.split('/')[-2] # e.g. /dev/ceph-<uuid>/osd-block-<uuid>
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retcode, stdout, stderr = common.run_os_command('vgs --separator , --noheadings -o pv_name {}'.format(vg_name))
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pv_block = stdout.strip()
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# 5. Zap the volumes
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logger.out('Zapping OSD disk with ID {} on {}'.format(osd_id, pv_block), state='i')
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retcode, stdout, stderr = common.run_os_command('ceph-volume lvm zap --destroy {}'.format(pv_block))
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if retcode:
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print('ceph-volume lvm zap')
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print(stdout)
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print(stderr)
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raise
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# 6. Purge the OSD from Ceph
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logger.out('Purging OSD disk with ID {}'.format(osd_id), state='i')
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retcode, stdout, stderr = common.run_os_command('ceph osd purge {} --yes-i-really-mean-it'.format(osd_id))
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if retcode:
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print('ceph osd purge')
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print(stdout)
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print(stderr)
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raise
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# 7. Delete OSD from ZK
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logger.out('Deleting OSD disk with ID {} from Zookeeper'.format(osd_id), state='i')
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zkhandler.deletekey(zk_conn, '/ceph/osds/{}'.format(osd_id))
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# Log it
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logger.out('Removed OSD disk with ID {}'.format(osd_id), state='o')
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return True
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except Exception as e:
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# Log it
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logger.out('Failed to purge OSD disk with ID {}: {}'.format(osd_id, e), state='e')
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return False
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class CephPoolInstance(object):
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def __init__(self, zk_conn, this_node, name):
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self.zk_conn = zk_conn
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self.this_node = this_node
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self.name = name
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self.pgs = ''
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self.stats = dict()
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@self.zk_conn.DataWatch('/ceph/pools/{}/pgs'.format(self.name))
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def watch_pool_node(data, stat, event=''):
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if event and event.type == 'DELETED':
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# The key has been deleted after existing before; terminate this watcher
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# because this class instance is about to be reaped in Daemon.py
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return False
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try:
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data = data.decode('ascii')
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except AttributeError:
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data = ''
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if data and data != self.pgs:
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self.pgs = data
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@self.zk_conn.DataWatch('/ceph/pools/{}/stats'.format(self.name))
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def watch_pool_stats(data, stat, event=''):
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if event and event.type == 'DELETED':
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# The key has been deleted after existing before; terminate this watcher
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# because this class instance is about to be reaped in Daemon.py
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return False
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try:
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data = data.decode('ascii')
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except AttributeError:
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data = ''
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if data and data != self.stats:
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self.stats = json.loads(data)
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class CephVolumeInstance(object):
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def __init__(self, zk_conn, this_node, pool, name):
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self.zk_conn = zk_conn
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self.this_node = this_node
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self.pool = pool
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self.name = name
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self.stats = dict()
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@self.zk_conn.DataWatch('/ceph/volumes/{}/{}/stats'.format(self.pool, self.name))
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def watch_volume_stats(data, stat, event=''):
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if event and event.type == 'DELETED':
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# The key has been deleted after existing before; terminate this watcher
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# because this class instance is about to be reaped in Daemon.py
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return False
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try:
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data = data.decode('ascii')
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except AttributeError:
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data = ''
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if data and data != self.stats:
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self.stats = json.loads(data)
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class CephSnapshotInstance(object):
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def __init__(self, zk_conn, this_node, name):
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self.zk_conn = zk_conn
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self.this_node = this_node
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self.pool = pool
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self.volume = volume
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self.name = name
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self.stats = dict()
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@self.zk_conn.DataWatch('/ceph/snapshots/{}/{}/{}/stats'.format(self.pool, self.volume, self.name))
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def watch_snapshot_stats(data, stat, event=''):
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if event and event.type == 'DELETED':
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# The key has been deleted after existing before; terminate this watcher
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# because this class instance is about to be reaped in Daemon.py
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return False
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try:
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data = data.decode('ascii')
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except AttributeError:
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data = ''
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if data and data != self.stats:
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self.stats = json.loads(data)
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# Primary command function
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# This command pipe is only used for OSD adds and removes
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def run_command(zk_conn, logger, this_node, data, d_osd):
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# Get the command and args
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command, args = data.split()
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# Adding a new OSD
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if command == 'osd_add':
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node, device, weight = args.split(',')
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if node == this_node.name:
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# Lock the command queue
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zk_lock = zkhandler.writelock(zk_conn, '/cmd/ceph')
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with zk_lock:
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# Add the OSD
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result = add_osd(zk_conn, logger, node, device, weight)
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# Command succeeded
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if result:
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# Update the command queue
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zkhandler.writedata(zk_conn, {'/cmd/ceph': 'success-{}'.format(data)})
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# Command failed
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else:
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# Update the command queue
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zkhandler.writedata(zk_conn, {'/cmd/ceph': 'failure-{}'.format(data)})
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# Wait 1 seconds before we free the lock, to ensure the client hits the lock
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time.sleep(1)
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# Removing an OSD
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elif command == 'osd_remove':
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osd_id = args
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# Verify osd_id is in the list
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if d_osd[osd_id] and d_osd[osd_id].node == this_node.name:
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# Lock the command queue
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zk_lock = zkhandler.writelock(zk_conn, '/cmd/ceph')
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with zk_lock:
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# Remove the OSD
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result = remove_osd(zk_conn, logger, osd_id, d_osd[osd_id])
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# Command succeeded
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if result:
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# Update the command queue
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zkhandler.writedata(zk_conn, {'/cmd/ceph': 'success-{}'.format(data)})
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# Command failed
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else:
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# Update the command queue
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zkhandler.writedata(zk_conn, {'/cmd/ceph': 'failure-{}'.format(data)})
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# Wait 1 seconds before we free the lock, to ensure the client hits the lock
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time.sleep(1)
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