前文我們了解了Ceph的訪問介面的啟用相關話題，回顧請參考https://www.cnblogs.com/qiuhom-1874/p/16727620.html；今天我們來聊一聊獲取ceph集群狀態和ceph組態檔說明相關話題；
Ceph集群狀態獲取常用命令
1、ceph -s ：該命令用于輸出ceph集群系統狀態資訊
提示：ceph -s主要輸出有三類資訊，一類是集群相關資訊，比如集群id，健康狀態；第二類是服務類相關資訊，比如集群運行了幾個mon節點，幾個mgr節點，幾個mds，osd和rgw；這些服務都處于什么樣的狀態等等；我們把這些資訊稱為集群運行狀況，它可以讓我們一目了然的了解到集群現有運行狀況；第三類資訊是資料存盤類的資訊；比如有多少個存盤池，和pg數量；usage用來展示集群使用容量和剩余容量以及總容量；這里需要注意一點，集群顯示的總磁盤大小，它不等于可以存盤這么多物件資料；因為每一個物件資料都多個副本，所以真正能夠存盤物件資料的量應該根據副本的數量來計算；默認情況下，我們創建的存盤都是副本型存盤池，副本數量是3個（其中一個主，兩個從），即每一個物件資料都會存盤三份，所以真正能夠存盤物件資料的空間只有總空間的三分之一；
獲取集群的即時狀態資訊
2、獲取pg的狀態
[cephadm@ceph-admin ceph-cluster]$ ceph pg stat 304 pgs: 304 active+clean; 3.8 KiB data, 10 GiB used, 890 GiB / 900 GiB avail [cephadm@ceph-admin ceph-cluster]$
3、獲取存盤池的狀態
[cephadm@ceph-admin ceph-cluster]$ ceph osd pool stats pool testpool id 1 nothing is going on pool rbdpool id 2 nothing is going on pool .rgw.root id 3 nothing is going on pool default.rgw.control id 4 nothing is going on pool default.rgw.meta id 5 nothing is going on pool default.rgw.log id 6 nothing is going on pool cephfs-metadatpool id 7 nothing is going on pool cephfs-datapool id 8 nothing is going on [cephadm@ceph-admin ceph-cluster]$
提示：如果后面沒有跟指定的存盤表示獲取所有存盤的狀態；
4、獲取存盤池大小和空間使用情況
[cephadm@ceph-admin ceph-cluster]$ ceph df
GLOBAL:
SIZE AVAIL RAW USED %RAW USED
900 GiB 890 GiB 10 GiB 1.13
POOLS:
NAME ID USED %USED MAX AVAIL OBJECTS
testpool 1 0 B 0 281 GiB 0
rbdpool 2 389 B 0 281 GiB 5
.rgw.root 3 1.1 KiB 0 281 GiB 4
default.rgw.control 4 0 B 0 281 GiB 8
default.rgw.meta 5 0 B 0 281 GiB 0
default.rgw.log 6 0 B 0 281 GiB 175
cephfs-metadatpool 7 2.2 KiB 0 281 GiB 22
cephfs-datapool 8 0 B 0 281 GiB 0
[cephadm@ceph-admin ceph-cluster]$
提示：ceph df輸出的內容主要分兩大段，第一段是global，全域存盤空間用量情況；size表示總空間大小，avail表示剩余空間大小；RAW USED表示已用到原始存盤空間；%RAW USED表示已用原始空間占比重空間的比例；第二段是相關存盤空間使用情況；其中MAX AVAIL表示對應存盤池能夠使用的最大容量；OBJECTS表示該存盤池中物件的個數；
獲取存盤空間用量詳細情況
[cephadm@ceph-admin ceph-cluster]$ ceph df detail
GLOBAL:
SIZE AVAIL RAW USED %RAW USED OBJECTS
900 GiB 890 GiB 10 GiB 1.13 214
POOLS:
NAME ID QUOTA OBJECTS QUOTA BYTES USED %USED MAX AVAIL OBJECTS DIRTY READ WRITE RAW USED
testpool 1 N/A N/A 0 B 0 281 GiB 0 0 2 B 2 B 0 B
rbdpool 2 N/A N/A 389 B 0 281 GiB 5 5 75 B 19 B 1.1 KiB
.rgw.root 3 N/A N/A 1.1 KiB 0 281 GiB 4 4 66 B 4 B 3.4 KiB
default.rgw.control 4 N/A N/A 0 B 0 281 GiB 8 8 0 B 0 B 0 B
default.rgw.meta 5 N/A N/A 0 B 0 281 GiB 0 0 0 B 0 B 0 B
default.rgw.log 6 N/A N/A 0 B 0 281 GiB 175 175 7.2 KiB 4.8 KiB 0 B
cephfs-metadatpool 7 N/A N/A 2.2 KiB 0 281 GiB 22 22 0 B 45 B 6.7 KiB
cephfs-datapool 8 N/A N/A 0 B 0 281 GiB 0 0 0 B 0 B 0 B
[cephadm@ceph-admin ceph-cluster]$
5、檢查OSD和MON的狀態
[cephadm@ceph-admin ceph-cluster]$ ceph osd stat
10 osds: 10 up, 10 in; epoch: e99
[cephadm@ceph-admin ceph-cluster]$ ceph osd dump
epoch 99
fsid 7fd4a619-9767-4b46-9cee-78b9dfe88f34
created 2022-09-24 00:36:13.639715
modified 2022-09-25 12:33:15.111283
flags sortbitwise,recovery_deletes,purged_snapdirs
crush_version 25
full_ratio 0.95
backfillfull_ratio 0.9
nearfull_ratio 0.85
require_min_compat_client jewel
min_compat_client jewel
require_osd_release mimic
pool 1 'testpool' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 16 pgp_num 16 last_change 42 flags hashpspool stripe_width 0
pool 2 'rbdpool' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 64 pgp_num 64 last_change 81 flags hashpspool,selfmanaged_snaps stripe_width 0 application rbd
removed_snaps [1~3]
pool 3 '.rgw.root' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 8 pgp_num 8 last_change 84 owner 18446744073709551615 flags hashpspool stripe_width 0 application rgw
pool 4 'default.rgw.control' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 8 pgp_num 8 last_change 87 owner 18446744073709551615 flags hashpspool stripe_width 0 application rgw
pool 5 'default.rgw.meta' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 8 pgp_num 8 last_change 89 owner 18446744073709551615 flags hashpspool stripe_width 0 application rgw
pool 6 'default.rgw.log' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 8 pgp_num 8 last_change 91 owner 18446744073709551615 flags hashpspool stripe_width 0 application rgw
pool 7 'cephfs-metadatpool' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 64 pgp_num 64 last_change 99 flags hashpspool stripe_width 0 application cephfs
pool 8 'cephfs-datapool' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 128 pgp_num 128 last_change 99 flags hashpspool stripe_width 0 application cephfs
max_osd 10
osd.0 up in weight 1 up_from 67 up_thru 96 down_at 66 last_clean_interval [64,65) 192.168.0.71:6802/1361 172.16.30.71:6802/1361 172.16.30.71:6803/1361 192.168.0.71:6803/1361 exists,up bf3649af-e3f4-41a2-a5ce-8f1a316d344e
osd.1 up in weight 1 up_from 68 up_thru 96 down_at 66 last_clean_interval [64,65) 192.168.0.71:6800/1346 172.16.30.71:6800/1346 172.16.30.71:6801/1346 192.168.0.71:6801/1346 exists,up 7293a12a-7b4e-4c86-82dc-0acc15c3349e
osd.2 up in weight 1 up_from 67 up_thru 96 down_at 66 last_clean_interval [60,65) 192.168.0.72:6800/1389 172.16.30.72:6800/1389 172.16.30.72:6801/1389 192.168.0.72:6801/1389 exists,up 96c437c5-8e82-4486-910f-9e98d195e4f9
osd.3 up in weight 1 up_from 67 up_thru 96 down_at 66 last_clean_interval [60,65) 192.168.0.72:6802/1406 172.16.30.72:6802/1406 172.16.30.72:6803/1406 192.168.0.72:6803/1406 exists,up 4659d2a9-09c7-49d5-bce0-4d2e65f5198c
osd.4 up in weight 1 up_from 71 up_thru 96 down_at 68 last_clean_interval [59,66) 192.168.0.73:6802/1332 172.16.30.73:6802/1332 172.16.30.73:6803/1332 192.168.0.73:6803/1332 exists,up de019aa8-3d2a-4079-a99e-ec2da2d4edb9
osd.5 up in weight 1 up_from 71 up_thru 96 down_at 68 last_clean_interval [58,66) 192.168.0.73:6800/1333 172.16.30.73:6800/1333 172.16.30.73:6801/1333 192.168.0.73:6801/1333 exists,up 119c8748-af3b-4ac4-ac74-6171c90c82cc
osd.6 up in weight 1 up_from 69 up_thru 96 down_at 68 last_clean_interval [59,66) 192.168.0.74:6800/1306 172.16.30.74:6800/1306 172.16.30.74:6801/1306 192.168.0.74:6801/1306 exists,up 08d8dd8b-cdfe-4338-83c0-b1e2b5c2a799
osd.7 up in weight 1 up_from 69 up_thru 96 down_at 68 last_clean_interval [60,65) 192.168.0.74:6802/1301 172.16.30.74:6802/1301 172.16.30.74:6803/1301 192.168.0.74:6803/1301 exists,up 9de6cbd0-bb1b-49e9-835c-3e714a867393
osd.8 up in weight 1 up_from 73 up_thru 96 down_at 66 last_clean_interval [59,65) 192.168.0.75:6800/1565 172.16.30.75:6800/1565 172.16.30.75:6801/1565 192.168.0.75:6801/1565 exists,up 63aaa0b8-4e52-4d74-82a8-fbbe7b48c837
osd.9 up in weight 1 up_from 73 up_thru 96 down_at 66 last_clean_interval [59,65) 192.168.0.75:6802/1558 172.16.30.75:6802/1558 172.16.30.75:6803/1558 192.168.0.75:6803/1558 exists,up 6bf3204a-b64c-4808-a782-434a93ac578c
[cephadm@ceph-admin ceph-cluster]$
除了上述命令來檢查osd狀態，我們還可以根據OSD在CRUSH MPA中的位置查看osd
[cephadm@ceph-admin ceph-cluster]$ ceph osd tree ID CLASS WEIGHT TYPE NAME STATUS REWEIGHT PRI-AFF -1 0.87891 root default -9 0.17578 host ceph-mgr01 6 hdd 0.07809 osd.6 up 1.00000 1.00000 7 hdd 0.09769 osd.7 up 1.00000 1.00000 -3 0.17578 host ceph-mon01 0 hdd 0.07809 osd.0 up 1.00000 1.00000 1 hdd 0.09769 osd.1 up 1.00000 1.00000 -5 0.17578 host ceph-mon02 2 hdd 0.07809 osd.2 up 1.00000 1.00000 3 hdd 0.09769 osd.3 up 1.00000 1.00000 -7 0.17578 host ceph-mon03 4 hdd 0.07809 osd.4 up 1.00000 1.00000 5 hdd 0.09769 osd.5 up 1.00000 1.00000 -11 0.17578 host node01 8 hdd 0.07809 osd.8 up 1.00000 1.00000 9 hdd 0.09769 osd.9 up 1.00000 1.00000 [cephadm@ceph-admin ceph-cluster]$
提示：從上面的輸出資訊我們可以看到每臺主機上osd編號情況，以及每個OSD的權重；
檢查mon節點狀態
[cephadm@ceph-admin ceph-cluster]$ ceph mon stat
e3: 3 mons at {ceph-mon01=192.168.0.71:6789/0,ceph-mon02=192.168.0.72:6789/0,ceph-mon03=192.168.0.73:6789/0}, election epoch 18, leader 0 ceph-mon01, quorum 0,1,2 ceph-mon01,ceph-mon02,ceph-mon03
[cephadm@ceph-admin ceph-cluster]$ ceph mon dump
dumped monmap epoch 3
epoch 3
fsid 7fd4a619-9767-4b46-9cee-78b9dfe88f34
last_changed 2022-09-24 01:56:24.196075
created 2022-09-24 00:36:13.210155
0: 192.168.0.71:6789/0 mon.ceph-mon01
1: 192.168.0.72:6789/0 mon.ceph-mon02
2: 192.168.0.73:6789/0 mon.ceph-mon03
[cephadm@ceph-admin ceph-cluster]$
提示：上述兩條命令都能顯示出集群有多少個mon節點，以及對應節點的ip地址和監聽埠，以及mon節點編號等資訊；ceph mon stat除了能顯示有多少mon節點和mon的詳細資訊外，它還顯示領導節點的編號，以及選舉次數；
查看仲裁狀態
[cephadm@ceph-admin ceph-cluster]$ ceph quorum_status
{"election_epoch":18,"quorum":[0,1,2],"quorum_names":["ceph-mon01","ceph-mon02","ceph-mon03"],"quorum_leader_name":"ceph-mon01","monmap":{"epoch":3,"fsid":"7fd4a619-9767-4b46-9cee-78b9dfe88f34","modified":"2022-09-24 01:56:24.196075","created":"2022-09-24 00:36:13.210155","features":{"persistent":["kraken","luminous","mimic","osdmap-prune"],"optional":[]},"mons":[{"rank":0,"name":"ceph-mon01","addr":"192.168.0.71:6789/0","public_addr":"192.168.0.71:6789/0"},{"rank":1,"name":"ceph-mon02","addr":"192.168.0.72:6789/0","public_addr":"192.168.0.72:6789/0"},{"rank":2,"name":"ceph-mon03","addr":"192.168.0.73:6789/0","public_addr":"192.168.0.73:6789/0"}]}}
[cephadm@ceph-admin ceph-cluster]$
使用管理套接字查詢集群狀態
Ceph的管理套接字介面常用于查詢守護行程，套接字默認保存 于/var/run/ceph目錄，此介面的使用不能以遠程方式行程，只能在對應節點上使用；
命令的使用格式：ceph --admin-daemon /var/run/ceph/socket-name 命令；比如獲取幫助資訊 ceph --admin-daemon /var/run/ceph/socket-name help
[root@ceph-mon01 ~]# ceph --admin-daemon /var/run/ceph/ceph-osd.0.asok help
{
"calc_objectstore_db_histogram": "Generate key value histogram of kvdb(rocksdb) which used by bluestore",
"compact": "Commpact object store's omap. WARNING: Compaction probably slows your requests",
"config diff": "dump diff of current config and default config",
"config diff get": "dump diff get <field>: dump diff of current and default config setting <field>",
"config get": "config get <field>: get the config value",
"config help": "get config setting schema and descriptions",
"config set": "config set <field> <val> [<val> ...]: set a config variable",
"config show": "dump current config settings",
"config unset": "config unset <field>: unset a config variable",
"dump_blacklist": "dump blacklisted clients and times",
"dump_blocked_ops": "show the blocked ops currently in flight",
"dump_historic_ops": "show recent ops",
"dump_historic_ops_by_duration": "show slowest recent ops, sorted by duration",
"dump_historic_slow_ops": "show slowest recent ops",
"dump_mempools": "get mempool stats",
"dump_objectstore_kv_stats": "print statistics of kvdb which used by bluestore",
"dump_op_pq_state": "dump op priority queue state",
"dump_ops_in_flight": "show the ops currently in flight",
"dump_osd_network": "Dump osd heartbeat network ping times",
"dump_pgstate_history": "show recent state history",
"dump_reservations": "show recovery reservations",
"dump_scrubs": "print scheduled scrubs",
"dump_watchers": "show clients which have active watches, and on which objects",
"flush_journal": "flush the journal to permanent store",
"flush_store_cache": "Flush bluestore internal cache",
"get_command_descriptions": "list available commands",
"get_heap_property": "get malloc extension heap property",
"get_latest_osdmap": "force osd to update the latest map from the mon",
"get_mapped_pools": "dump pools whose PG(s) are mapped to this OSD.",
"getomap": "output entire object map",
"git_version": "get git sha1",
"heap": "show heap usage info (available only if compiled with tcmalloc)",
"help": "list available commands",
"injectdataerr": "inject data error to an object",
"injectfull": "Inject a full disk (optional count times)",
"injectmdataerr": "inject metadata error to an object",
"list_devices": "list OSD devices.",
"log dump": "dump recent log entries to log file",
"log flush": "flush log entries to log file",
"log reopen": "reopen log file",
"objecter_requests": "show in-progress osd requests",
"ops": "show the ops currently in flight",
"perf dump": "dump perfcounters value",
"perf histogram dump": "dump perf histogram values",
"perf histogram schema": "dump perf histogram schema",
"perf reset": "perf reset <name>: perf reset all or one perfcounter name",
"perf schema": "dump perfcounters schema",
"rmomapkey": "remove omap key",
"set_heap_property": "update malloc extension heap property",
"set_recovery_delay": "Delay osd recovery by specified seconds",
"setomapheader": "set omap header",
"setomapval": "set omap key",
"smart": "probe OSD devices for SMART data.",
"status": "high-level status of OSD",
"trigger_deep_scrub": "Trigger a scheduled deep scrub ",
"trigger_scrub": "Trigger a scheduled scrub ",
"truncobj": "truncate object to length",
"version": "get ceph version"
}
[root@ceph-mon01 ~]#
比如獲取mon01的版本資訊
[root@ceph-mon01 ~]# ceph --admin-daemon /var/run/ceph/ceph-mon.ceph-mon01.asok version
{"version":"13.2.10","release":"mimic","release_type":"stable"}
[root@ceph-mon01 ~]#
獲取osd的狀態資訊
[root@ceph-mon01 ~]# ceph --admin-daemon /var/run/ceph/ceph-osd.0.asok status
{
"cluster_fsid": "7fd4a619-9767-4b46-9cee-78b9dfe88f34",
"osd_fsid": "bf3649af-e3f4-41a2-a5ce-8f1a316d344e",
"whoami": 0,
"state": "active",
"oldest_map": 1,
"newest_map": 114,
"num_pgs": 83
}
[root@ceph-mon01 ~]#
行程的運行時配置
我們可以使用ceph daemon命令來動態的配置ceph行程，即不停服務動態配置行程；
比如，獲取osd.0的公網地址
[root@ceph-mon01 ~]# ceph daemon osd.0 config get public_addr
{
"public_addr": "192.168.0.71:0/0"
}
[root@ceph-mon01 ~]#
獲取幫助資訊：命令格式：ceph daemon {daemon-type}.{id} help
[root@ceph-mon01 ~]# ceph daemon osd.1 help
{
"calc_objectstore_db_histogram": "Generate key value histogram of kvdb(rocksdb) which used by bluestore",
"compact": "Commpact object store's omap. WARNING: Compaction probably slows your requests",
"config diff": "dump diff of current config and default config",
"config diff get": "dump diff get <field>: dump diff of current and default config setting <field>",
"config get": "config get <field>: get the config value",
"config help": "get config setting schema and descriptions",
"config set": "config set <field> <val> [<val> ...]: set a config variable",
"config show": "dump current config settings",
"config unset": "config unset <field>: unset a config variable",
"dump_blacklist": "dump blacklisted clients and times",
"dump_blocked_ops": "show the blocked ops currently in flight",
"dump_historic_ops": "show recent ops",
"dump_historic_ops_by_duration": "show slowest recent ops, sorted by duration",
"dump_historic_slow_ops": "show slowest recent ops",
"dump_mempools": "get mempool stats",
"dump_objectstore_kv_stats": "print statistics of kvdb which used by bluestore",
"dump_op_pq_state": "dump op priority queue state",
"dump_ops_in_flight": "show the ops currently in flight",
"dump_osd_network": "Dump osd heartbeat network ping times",
"dump_pgstate_history": "show recent state history",
"dump_reservations": "show recovery reservations",
"dump_scrubs": "print scheduled scrubs",
"dump_watchers": "show clients which have active watches, and on which objects",
"flush_journal": "flush the journal to permanent store",
"flush_store_cache": "Flush bluestore internal cache",
"get_command_descriptions": "list available commands",
"get_heap_property": "get malloc extension heap property",
"get_latest_osdmap": "force osd to update the latest map from the mon",
"get_mapped_pools": "dump pools whose PG(s) are mapped to this OSD.",
"getomap": "output entire object map",
"git_version": "get git sha1",
"heap": "show heap usage info (available only if compiled with tcmalloc)",
"help": "list available commands",
"injectdataerr": "inject data error to an object",
"injectfull": "Inject a full disk (optional count times)",
"injectmdataerr": "inject metadata error to an object",
"list_devices": "list OSD devices.",
"log dump": "dump recent log entries to log file",
"log flush": "flush log entries to log file",
"log reopen": "reopen log file",
"objecter_requests": "show in-progress osd requests",
"ops": "show the ops currently in flight",
"perf dump": "dump perfcounters value",
"perf histogram dump": "dump perf histogram values",
"perf histogram schema": "dump perf histogram schema",
"perf reset": "perf reset <name>: perf reset all or one perfcounter name",
"perf schema": "dump perfcounters schema",
"rmomapkey": "remove omap key",
"set_heap_property": "update malloc extension heap property",
"set_recovery_delay": "Delay osd recovery by specified seconds",
"setomapheader": "set omap header",
"setomapval": "set omap key",
"smart": "probe OSD devices for SMART data.",
"status": "high-level status of OSD",
"trigger_deep_scrub": "Trigger a scheduled deep scrub ",
"trigger_scrub": "Trigger a scheduled scrub ",
"truncobj": "truncate object to length",
"version": "get ceph version"
}
[root@ceph-mon01 ~]#
提示：ceph daemon獲取某個行程的資訊時，需要在對應主機上用root執行命令；
動態設定行程引數有兩種方式，一種是通過mon向對應行程發送配置，一種是通過admin socket發送配置給行程
通過mon向對應行程發送配置命令格式： ceph tell {daemon-type}.{daemon id or *} injectargs --{name} {value} [--{name} {value}]
[cephadm@ceph-admin ceph-cluster]$ ceph tell osd.1 injectargs '--debug-osd 0/5' [cephadm@ceph-admin ceph-cluster]$
提示：這種方式可以在集群任意主機上執行；
通過admin socket的方式發送配置命令格式：ceph daemon {daemon-type}.{id} set {name} {value}
[root@ceph-mon01 ~]# ceph daemon osd.0 config set debug_osd 0/5
{
"success": ""
}
[root@ceph-mon01 ~]#
提示：這種方式只能在行程所在主機上執行；
停止或重啟Ceph集群步驟
停止ceph集群步驟
1、告知Ceph集群不要將OSD標記為out，命令：ceph osd set noout
[cephadm@ceph-admin ceph-cluster]$ ceph osd set noout noout is set [cephadm@ceph-admin ceph-cluster]$
2、按如下順序停止守護行程和節點：停止存盤客戶端--->網關，如rgw--->元資料服務器，MDS---> Ceph OSD---> Ceph Manager--->Ceph Monitor；然后關閉對應主機；
啟動ceph集群步驟
1、以與停止程序相關的順序啟動節點：Ceph Monitor--->Ceph Manager--->Ceph OSD--->元資料服務器，MDS--->網關，如rgw---->存盤客戶端；
2、洗掉noout標志，命令ceph osd unset noout
[cephadm@ceph-admin ceph-cluster]$ ceph osd unset noout noout is unset [cephadm@ceph-admin ceph-cluster]$
提示：集群重新啟動起來，需要將noout標記取消，以免但真正有osd故障時，能夠將osd及時下線，避免將對應存取資料的操作調度到對應osd上進行操作而引發的故障；
ceph是一個物件存盤集群，在生產環境中，如有不慎可能導致不可預估的后果，所以停止和啟動順序都非常重要；上述程序主要是盡量減少丟失資料的幾率，但不保證一定不丟資料；
Ceph組態檔ceph.conf說明
[cephadm@ceph-admin ceph-cluster]$ cat /etc/ceph/ceph.conf [global] fsid = 7fd4a619-9767-4b46-9cee-78b9dfe88f34 mon_initial_members = ceph-mon01 mon_host = 192.168.0.71 public_network = 192.168.0.0/24 cluster_network = 172.16.30.0/24 auth_cluster_required = cephx auth_service_required = cephx auth_client_required = cephx [cephadm@ceph-admin ceph-cluster]$
提示：ceph.conf組態檔嚴格遵守ini組態檔風格的語法和格式；其中井號‘#’和冒號‘；’用于注釋；ceph.conf主要有[global]、[osd]、[mon]、[client]這4個配置段組成；其中global配置段適用于全域配置，即各組件的公共配置；【osd】配置段作用范圍是集群所有osd都生效的配置；【mon】作用范圍是集群所以mon都生效的配置；【client】作用范圍是所有客戶端，比如rbd、rgw；
mon和osd的獨有配置段
上面的【osd】和【mon】配置段都是針對所有osd和mon生效，如果我們只想配置單獨某一個osd或mon該怎么配置呢？ceph.conf中我們使用[type.ID]來表示某一個osd或mon的配置；比如，我們只想配置osd.0，則我們可以在配置段里寫[osd.0]來表示該段配置只針對osd.0生效；同樣mon也是同樣的邏輯，不同于osd的是，mon的ID不是數字；我們可以使用ceph mon dump來查看mon的ID；
獲取osd的編號
提示：osd的編號都是數字，從0開始；
ceph.conf配置段生效優先級
如果以上公共配置段里的配置和專用配置段的配置重復，則專用配置段覆寫公共配置段里的配置，即專用配置段里的配置生效；配置生效優先級順序為：【global】小于【osd】、【mon】、【client】；【osd】小于【osd.ID】，【mon】小于【mon.a】；總之配置段作用范圍越小，越優先生效；
ceph組態檔生效優先級
ceph啟動時會按如下順序查找組態檔
1、$CEPH_CONF：該環境變數所指定的組態檔；
2、-c path/path ：命令列使用-c選項指定的組態檔路徑；
3、/etc/ceph/ceph.conf：默認組態檔路徑
4、～/.ceph/config：當前用戶家目錄下.ceph/config檔案
5、./ceph.conf ：當前用戶所在目錄下的ceph.conf檔案
組態檔生效順序是$CEPH_CONF---->-c path/path ---->/etc/ceph/ceph.conf---->～/.ceph/config---->./ceph.conf ；
Ceph組態檔常用的元引數
ceph組態檔支持用元引數來替換對應配置資訊，比如$cluster就表示當前Ceph集群的名稱；$type表示當前服務的型別名稱；比如osd、mon；$id表示守護行程的識別符號，比如以osd.0來說，它的識別符號就是0；$host表示守護行程所在主機的主機名；$name表示當前服務的型別名稱和行程識別符號的組合；即$name=$type.$id；
作者：Linux-1874 出處：https://www.cnblogs.com/qiuhom-1874/ 本文著作權歸作者和博客園共有，歡迎轉載，但未經作者同意必須保留此段宣告，且在文章頁面明顯位置給出原文連接，否則保留追究法律責任的權利.轉載請註明出處，本文鏈接：https://www.uj5u.com/qita/510955.html
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