ceph-deploy中osd模块有什么用
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ceph-deploy源码分析——osd模块
ceph-deploy的osd.py模块是用来管理osd守护进程，主要是创建与激活OSD。
osd 子命令格式如下
ceph-deploy osd [-h] {list,create,prepare,activate} ...list: 显示osd列表信息
create: 创建OSD，包含prepare与activate
prepare: 准备OSD，通过格式化/分区磁盘
activate: 激活准备的OSD
OSD管理
make函数
priority为50
osd子命令默认执行函数为osd
@priority(50) def make(parser): """ Prepare a data disk on remote host. """ sub_command_help = dedent(""" Manage OSDs by preparing a data disk on remote host. For paths, first prepare and then activate: ceph-deploy osd prepare {osd-node-name}:/path/to/osd ceph-deploy osd activate {osd-node-name}:/path/to/osd For disks or journals the `create` command will do prepare and activate for you. """ ) parser.formatter_class = argparse.RawDescriptionHelpFormatter parser.description = sub_command_help osd_parser = parser.add_subparsers(dest='subcommand') osd_parser.required = True osd_list = osd_parser.add_parser( 'list', help='List OSD info from remote host(s)' ) osd_list.add_argument( 'disk', nargs='+', metavar='HOST:DISK[:JOURNAL]', type=colon_separated, help='remote host to list OSDs from' ) osd_create = osd_parser.add_parser( 'create', help='Create new Ceph OSD daemon by preparing and activating disk' ) osd_create.add_argument( '--zap-disk', action='store_true', help='destroy existing partition table and content for DISK', ) osd_create.add_argument( '--fs-type', metavar='FS_TYPE', choices=['xfs', 'btrfs' ], default='xfs', help='filesystem to use to format DISK (xfs, btrfs)', ) osd_create.add_argument( '--dmcrypt', action='store_true', help='use dm-crypt on DISK', ) osd_create.add_argument( '--dmcrypt-key-dir', metavar='KEYDIR', default='/etc/ceph/dmcrypt-keys', help='directory where dm-crypt keys are stored', ) osd_create.add_argument( '--bluestore', action='store_true', default=None, help='bluestore objectstore', ) osd_create.add_argument( 'disk', nargs='+', metavar='HOST:DISK[:JOURNAL]', type=colon_separated, help='host and disk to prepare', ) osd_prepare = osd_parser.add_parser( 'prepare', help='Prepare a disk for use as Ceph OSD by formatting/partitioning disk' ) osd_prepare.add_argument( '--zap-disk', action='store_true', help='destroy existing partition table and content for DISK', ) osd_prepare.add_argument( '--fs-type', metavar='FS_TYPE', choices=['xfs', 'btrfs' ], default='xfs', help='filesystem to use to format DISK (xfs, btrfs)', ) osd_prepare.add_argument( '--dmcrypt', action='store_true', help='use dm-crypt on DISK', ) osd_prepare.add_argument( '--dmcrypt-key-dir', metavar='KEYDIR', default='/etc/ceph/dmcrypt-keys', help='directory where dm-crypt keys are stored', ) osd_prepare.add_argument( '--bluestore', action='store_true', default=None, help='bluestore objectstore', ) osd_prepare.add_argument( 'disk', nargs='+', metavar='HOST:DISK[:JOURNAL]', type=colon_separated, help='host and disk to prepare', ) osd_activate = osd_parser.add_parser( 'activate', help='Start (activate) Ceph OSD from disk that was previously prepared' ) osd_activate.add_argument( 'disk', nargs='+', metavar='HOST:DISK[:JOURNAL]', type=colon_separated, help='host and disk to activate', ) parser.set_defaults( func=osd, )
osd函数，osd子命令list,create,prepare,activate分别对应的函数为osd_list、prepare、prepare、activate。
def osd(args):
cfg = conf.ceph.load(args)
if args.subcommand == 'list':
osd_list(args, cfg)
elif args.subcommand == 'prepare':
prepare(args, cfg, activate_prepared_disk=False)
elif args.subcommand == 'create':
prepare(args, cfg, activate_prepared_disk=True)
elif args.subcommand == 'activate':
activate(args, cfg)
else:
LOG.error('subcommand %s not implemented', args.subcommand)
sys.exit(1)
OSD列表
命令行格式为：ceph-deploy osd list [-h] HOST:DISK[:JOURNAL] [HOST:DISK[:JOURNAL] …]
osd_list函数
执行ceph --cluster=ceph osd tree --format=json命令获取OSD信息
执行ceph-disk list命令获取磁盘、分区信息
根据两个命令结果以及osd目录下文件信息，组装输出OSD列表数据
def osd_list(args, cfg): monitors = mon.get_mon_initial_members(args, error_on_empty=True, _cfg=cfg) # get the osd tree from a monitor host mon_host = monitors[0] distro = hosts.get( mon_host, username=args.username, callbacks=[packages.ceph_is_installed] ) # 执行ceph --cluster=ceph osd tree --format=json命令获取osd信息 tree = osd_tree(distro.conn, args.cluster) distro.conn.exit() interesting_files = ['active', 'magic', 'whoami', 'journal_uuid'] for hostname, disk, journal in args.disk: distro = hosts.get(hostname, username=args.username) remote_module = distro.conn.remote_module #获取OSD的目录/var/run/ceph/osd下的osd名称 osds = distro.conn.remote_module.listdir(constants.osd_path) # 执行ceph-disk list命令获取磁盘、分区信息 ceph_disk_executable = system.executable_path(distro.conn, 'ceph-disk') output, err, exit_code = remoto.process.check( distro.conn, [ ceph_disk_executable, 'list', ] ) # 循环OSD for _osd in osds: # osd路径，比如/var/run/ceph/osd/ceph-0 osd_path = os.path.join(constants.osd_path, _osd) # journal路径 journal_path = os.path.join(osd_path, 'journal') # OSD的id _id = int(_osd.split('-')[-1]) # split on dash, get the id osd_name = 'osd.%s' % _id metadata = {} json_blob = {} # piggy back from ceph-disk and get the mount point # ceph-disk list的结果与osd名称匹配，获取磁盘设备 device = get_osd_mount_point(output, osd_name) if device: metadata['device'] = device # read interesting metadata from files # 获取OSD下的active, magic, whoami, journal_uuid文件信息 for f in interesting_files: osd_f_path = os.path.join(osd_path, f) if remote_module.path_exists(osd_f_path): metadata[f] = remote_module.readline(osd_f_path) # do we have a journal path? # 获取 journal path if remote_module.path_exists(journal_path): metadata['journal path'] = remote_module.get_realpath(journal_path) # is this OSD in osd tree? for blob in tree['nodes']: if blob.get('id') == _id: # matches our OSD json_blob = blob # 输出OSD信息 print_osd( distro.conn.logger, hostname, osd_path, json_blob, metadata, ) distro.conn.exit()
创建OSD&准备OSD
创建OSD的命令行格式为：ceph-deploy osd create [-h] [–zap-disk] [–fs-type FS_TYPE] [–dmcrypt] [–dmcrypt-key-dir KEYDIR] [–bluestore] HOST:DISK[:JOURNAL] [HOST:DISK[:JOURNAL] …]
准备OSD的命令行格式为：ceph-deploy osd prepare [-h] [–zap-disk] [–fs-type FS_TYPE] [–dmcrypt] [–dmcrypt-key-dir KEYDIR] [–bluestore] HOST:DISK[:JOURNAL] [HOST:DISK[:JOURNAL] …]
prepare函数，参数activate_prepared_disk为True是创建OSD，为False是准备OSD
调用exceeds_max_osds函数，单台主机超过20个OSD，将会warning
调用get_bootstrap_osd_key函数，获取当前目录下的ceph.bootstrap-osd.keyring
循环disk
配置写入 /etc/ceph/ceph.conf
创建并写入 /var/lib/ceph/bootstrap-osd/ceph.keyring
调用prepare_disk函数，准备OSD
校验OSD状态，并将信息非正常状态信息写入warning
def prepare(args, cfg, activate_prepared_disk):
LOG.debug(
'Preparing cluster %s disks %s',
args.cluster,
' '.join(':'.join(x or '' for x in t) for t in args.disk),
)
# 单台主机超过20个OSD，将会warning
hosts_in_danger = exceeds_max_osds(args)
if hosts_in_danger:
LOG.warning('if ``kernel.pid_max`` is not increased to a high enough value')
LOG.warning('the following hosts will encounter issues:')
for host, count in hosts_in_danger.items():
LOG.warning('Host: %8s, OSDs: %s' % (host, count))
# 获取当前目录下的ceph.bootstrap-osd.keyring
key = get_bootstrap_osd_key(cluster=args.cluster)
bootstrapped = set()
errors = 0
for hostname, disk, journal in args.disk:
try:
if disk is None:
raise exc.NeedDiskError(hostname)
distro = hosts.get(
hostname,
username=args.username,
callbacks=[packages.ceph_is_installed]
)
LOG.info(
'Distro info: %s %s %s',
distro.name,
distro.release,
distro.codename
)
if hostname not in bootstrapped:
bootstrapped.add(hostname)
LOG.debug('Deploying osd to %s', hostname)
conf_data = conf.ceph.load_raw(args)
# 配置写入/etc/ceph/ceph.conf
distro.conn.remote_module.write_conf(
args.cluster,
conf_data,
args.overwrite_conf
)
# 创建并写入 /var/lib/ceph/bootstrap-osd/ceph.keyring
create_osd_keyring(distro.conn, args.cluster, key)
LOG.debug('Preparing host %s disk %s journal %s activate %s',
hostname, disk, journal, activate_prepared_disk)
storetype = None
if args.bluestore:
storetype = 'bluestore'
# 准备OSD
prepare_disk(
distro.conn,
cluster=args.cluster,
disk=disk,
journal=journal,
activate_prepared_disk=activate_prepared_disk,
init=distro.init,
zap=args.zap_disk,
fs_type=args.fs_type,
dmcrypt=args.dmcrypt,
dmcrypt_dir=args.dmcrypt_key_dir,
storetype=storetype,
)
# give the OSD a few seconds to start
time.sleep(5)
# 校验OSD状态，并将信息非正常状态信息写入warning
catch_osd_errors(distro.conn, distro.conn.logger, args)
LOG.debug('Host %s is now ready for osd use.', hostname)
distro.conn.exit()
except RuntimeError as e:
LOG.error(e)
errors += 1
if errors:
raise exc.GenericError('Failed to create %d OSDs' % errors)prepare_disk函数
执行 ceph-disk -v prepare 命令准备OSD
如果activate_prepared_disk为True，设置ceph服务开机启动
def prepare_disk( conn, cluster, disk, journal, activate_prepared_disk, init, zap, fs_type, dmcrypt, dmcrypt_dir, storetype): """ Run on osd node, prepares a data disk for use. """ ceph_disk_executable = system.executable_path(conn, 'ceph-disk') args = [ ceph_disk_executable, '-v', 'prepare', ] if zap: args.append('--zap-disk') if dmcrypt: args.append('--dmcrypt') if dmcrypt_dir is not None: args.append('--dmcrypt-key-dir') args.append(dmcrypt_dir) if storetype: args.append('--' + storetype) args.extend([ '--cluster', cluster, '--fs-type', fs_type, '--', disk, ]) if journal is not None: args.append(journal) # 执行 ceph-disk -v prepare 命令 remoto.process.run( conn, args ) # 是否激活，激活即设置ceph服务开机启动 if activate_prepared_disk: # we don't simply run activate here because we don't know # which partition ceph-disk prepare created as the data # volume. instead, we rely on udev to do the activation and # just give it a kick to ensure it wakes up. we also enable # ceph.target, the other key piece of activate. if init == 'systemd': system.enable_service(conn, "ceph.target") elif init == 'sysvinit': system.enable_service(conn, "ceph")
激活OSD
命令行格式为：ceph-deploy osd activate [-h] HOST:DISK[:JOURNAL] [HOST:DISK[:JOURNAL] …]
activate函数
执行 ceph-disk -v activate 命令激活OSD
校验OSD状态，并将信息非正常状态信息写入warning
设置ceph服务开机启动
def activate(args, cfg): LOG.debug( 'Activating cluster %s disks %s', args.cluster, # join elements of t with ':', t's with ' ' # allow None in elements of t; print as empty ' '.join(':'.join((s or '') for s in t) for t in args.disk), ) for hostname, disk, journal in args.disk: distro = hosts.get( hostname, username=args.username, callbacks=[packages.ceph_is_installed] ) LOG.info( 'Distro info: %s %s %s', distro.name, distro.release, distro.codename ) LOG.debug('activating host %s disk %s', hostname, disk) LOG.debug('will use init type: %s', distro.init) ceph_disk_executable = system.executable_path(distro.conn, 'ceph-disk') # 执行 ceph-disk -v activate 命令激活OSD remoto.process.run( distro.conn, [ ceph_disk_executable, '-v', 'activate', '--mark-init', distro.init, '--mount', disk, ], ) # give the OSD a few seconds to start time.sleep(5) # 校验OSD状态，并将信息非正常状态信息写入warning catch_osd_errors(distro.conn, distro.conn.logger, args) # 设置ceph服务开机启动 if distro.init == 'systemd': system.enable_service(distro.conn, "ceph.target") elif distro.init == 'sysvinit': system.enable_service(distro.conn, "ceph") distro.conn.exit()
手工管理OSD
以ceph-231上磁盘sdb为例，创建osd。
创建OSD&准备OSD
准备OSD
[root@ceph-231 ~]# ceph-disk -v prepare --zap-disk --cluster ceph --fs-type xfs -- /dev/sdb
创建OSD多一个操作，设置ceph服务开机启动
[root@ceph-231 ~]# systemctl enable ceph.target
激活OSD
查看init
[root@ceph-231 ~]# cat /proc/1/comm systemd
激活OSD
[root@ceph-231 ~]# ceph-disk -v activate --mark-init systemd --mount /dev/sdb1
设置ceph服务开机启动
[root@ceph-231 ~]# systemctl enable ceph.target
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