这篇文章主要为大家展示了“ceph-deploy中osd模块有什么用”，内容简而易懂，条理清晰，希望能够帮助大家解决疑惑，下面让小编带领大家一起研究并学习一下“ceph-deploy中osd模块有什么用”这篇文章吧。
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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} ...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
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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