内容简介：Ceph 簡單指令操作
Monitoring and Health
剛安裝完，首先先檢查 ceph cluster 的狀態：
# 檢視 ceph cluster status
$ ceph -s
cluster cd6fcb41-c373-48fb-aab3-f8d330a26ccb
health HEALTH_WARN
too few PGs per OSD (16 < min 30)
monmap e1: 3 mons at {ceph01=10.102.41.101:6789/0,ceph02=10.102.41.102:6789/0,ceph03=10.102.41.103:6789/0}
election epoch 8, quorum 0,1,2 ceph01,ceph02,ceph03
osdmap e36: 12 osds: 12 up, 12 in
flags sortbitwise,require_jewel_osds
pgmap v84: 64 pgs, 1 pools, 0 bytes data, 0 objects
405 MB used, 2174 GB / 2174 GB avail
64 active+clean
也可以用 ceph -w
檢視即時的狀態
檢查健康狀態：
$ ceph health detail HEALTH_WARN too few PGs per OSD (16 < min 30) too few PGs per OSD (16 < min 30)
接著檢視目前 ceph cluster 提供了多少容量可用：
# 檢視目前可用的容量、每個 pool 的使用狀況 & quota 等資訊
$ ceph df
GLOBAL:
SIZE AVAIL RAW USED %RAW USED
2174G 2174G 405M 0.02
POOLS:
NAME ID USED %USED MAX AVAIL OBJECTS
rbd 0 0 0 724G 0
# 連到 CRUSH tree, 顯示 weight, variance, capacity ... etc
$ ceph osd df tree
ID WEIGHT REWEIGHT SIZE USE AVAIL %USE VAR PGS TYPE NAME
-1 2.12384 - 2174G 405M 2174G 0.02 1.00 0 root default
-2 0.70795 - 724G 135M 724G 0.02 1.00 0 host ceph01
0 0.17699 1.00000 181G 35200k 181G 0.02 1.02 11 osd.0
3 0.17699 1.00000 181G 34708k 181G 0.02 1.00 19 osd.3
6 0.17699 1.00000 181G 34420k 181G 0.02 0.99 14 osd.6
8 0.17699 1.00000 181G 34336k 181G 0.02 0.99 20 osd.8
-3 0.70795 - 724G 135M 724G 0.02 1.00 0 host ceph03
1 0.17699 1.00000 181G 35568k 181G 0.02 1.03 17 osd.1
5 0.17699 1.00000 181G 34432k 181G 0.02 0.99 12 osd.5
9 0.17699 1.00000 181G 34272k 181G 0.02 0.99 18 osd.9
11 0.17699 1.00000 181G 34200k 181G 0.02 0.99 17 osd.11
-4 0.70795 - 724G 135M 724G 0.02 1.00 0 host ceph02
2 0.17699 1.00000 181G 35076k 181G 0.02 1.01 19 osd.2
4 0.17699 1.00000 181G 34652k 181G 0.02 1.00 18 osd.4
7 0.17699 1.00000 181G 34456k 181G 0.02 0.99 11 osd.7
10 0.17699 1.00000 181G 34280k 181G 0.02 0.99 16 osd.10
TOTAL 2174G 405M 2174G 0.02
Working with Pools and OSDs
若要尋找單顆 OSD 的相關資訊：
# 尋找 OSD physical location
$ ceph osd find 1
{
"osd": 1,
"ip": "10.102.41.103:6800\/63011",
"crush_location": {
"host": "ceph03",
"root": "default"
}
}
# 顯示指定 OSD metadata
$ ceph osd metadata 1
{
"id": 1,
"arch": "x86_64",
"back_addr": "10.102.41.103:6801\/63011",
"backend_filestore_dev_node": "unknown",
"backend_filestore_partition_path": "unknown",
"ceph_version": "ceph version 10.2.5-37.el7cp (033f137cde8573cfc5a4662b4ed6a63b8a8d1464)",
......
"osd_data": "\/var\/lib\/ceph\/osd\/ceph-1",
"osd_journal": "\/var\/lib\/ceph\/osd\/ceph-1\/journal",
"osd_objectstore": "filestore"
}
建立/移除 pool:
# 建立 pool, 名稱為 pve_image, pg 數量為 1024 $ ceph osd pool create pve_images 1024 pool 'pve_images' created # 顯示目前 pool 詳細狀態 $ ceph osd pool ls detail pool 0 'rbd' replicated size 3 min_size 2 crush_ruleset 0 object_hash rjenkins pg_num 64 pgp_num 64 last_change 1 flags hashpspool stripe_width 0 pool 1 'pve_images' replicated size 3 min_size 2 crush_ruleset 0 object_hash rjenkins pg_num 1024 pgp_num 1024 last_change 37 flags hashpspool stripe_width 0 # 顯示指定 pool 的詳細資料 $ ceph osd pool get pve_images all size: 3 min_size: 2 crash_replay_interval: 0 pg_num: 1024 pgp_num: 1024 crush_ruleset: 0 ... # 移除 pool (要重複 pool name 兩次還要加上那有趣的參數) $ ceph osd pool delete pve_images pve_images --yes-i-really-really-mean-it pool 'pve_images' removed
調整現有 pool 的狀態：
# 設定 placement groups 的數量
$ ceph osd pool set rbd pg_num 384
set pool 0 pg_num to 384
# pgp => The effective number of placement groups to use when calculating data placement.
$ ceph osd pool set rbd pgp_num 384
set pool 0 pgp_num to 384
# 調整完就會從原本的 warning 狀態變成 health_ok 了!
$ ceph -s
cluster cd6fcb41-c373-48fb-aab3-f8d330a26ccb
health HEALTH_OK
monmap e1: 3 mons at {ceph01=10.102.41.101:6789/0,ceph02=10.102.41.102:6789/0,ceph03=10.102.41.103:6789/0}
election epoch 8, quorum 0,1,2 ceph01,ceph02,ceph03
osdmap e47: 12 osds: 12 up, 12 in
flags sortbitwise,require_jewel_osds
pgmap v177: 384 pgs, 1 pools, 0 bytes data, 0 objects
461 MB used, 2174 GB / 2174 GB avail
384 active+clean
Authentication and Authorization
# 檢視目前可使用 ceph cluster 的 user list $ ceph auth list installed auth entries: osd.0 key: ABxxxxxxx caps: [mon] allow profile osd caps: [osd] allow * ...... client.admin key: ABxxxxxxx caps: [mds] allow * caps: [mon] allow * caps: [osd] allow * client.bootstrap-mds key: ABxxxxxxx caps: [mon] allow profile bootstrap-mds client.bootstrap-osd key: ABxxxxxxx caps: [mon] allow profile bootstrap-osd client.bootstrap-rgw key: ABxxxxxxx caps: [mon] allow profile bootstrap-rgw
References
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