内容简介:Ceph实验室:第四课:Ceph监控
本课程演示如何监控一个Ceph集群。我们将学习如何用ceph的命令行 工具 进行监控。
监控集群的整体状态
- 健康状态
ceph命令的health选项查看集群的健康状态。
# ceph health detail HEALTH_WARN clock skew detected on mon.ceph-node2; Monitor clock skew detected mon.ceph-node2 addr 192.168.1.121:6789/0 clock skew 0.194536s > max 0.05s (latency 0.00103766s) HEALTH_WARN表示集群处于“告警”状态。
- 集群事件监控
ceph命令的-w选项用于监控集群的事件,这个命令会实时显示集群中所有的事件消息。
# ceph -w cluster b6e0c604-c9dd-4eac-9b00-45ff246d64fb health HEALTH_WARN clock skew detected on mon.ceph-node2 Monitor clock skew detected monmap e2: 2 mons at {ceph-node1=192.168.1.120:6789/0,ceph-node2=192.168.1.121:6789/0} election epoch 24, quorum 0,1 ceph-node1,ceph-node2 osdmap e28: 6 osds: 6 up, 6 in flags sortbitwise,require_jewel_osds pgmap v99: 0 pgs, 0 pools, 0 bytes data, 0 objects 197 MB used, 91895 MB / 92093 MB avail 2017-03-16 12:00:00.000245 mon.0 [INF] HEALTH_WARN; clock skew detected on mon.ceph-node2; Monitor clock skew detected
- 集群存储空间统计
ceph命令的df选项可以获取集群的存储空间使用统计数据,包括集群的总容量,剩余的可用容量,以及已使用容量的百分百。
# ceph df GLOBAL: SIZE AVAIL RAW USED %RAW USED 92093M 91895M 197M 0.21 POOLS: NAME ID USED %USED MAX AVAIL OBJECTS
- 集群状态
使用status选项可以查看集群的状态。
# ceph -s cluster b6e0c604-c9dd-4eac-9b00-45ff246d64fb health HEALTH_WARN clock skew detected on mon.ceph-node2 Monitor clock skew detected monmap e2: 2 mons at {ceph-node1=192.168.1.120:6789/0,ceph-node2=192.168.1.121:6789/0} election epoch 24, quorum 0,1 ceph-node1,ceph-node2 osdmap e28: 6 osds: 6 up, 6 in flags sortbitwise,require_jewel_osds pgmap v99: 0 pgs, 0 pools, 0 bytes data, 0 objects 197 MB used, 91895 MB / 92093 MB avail # ntpdate pool.ntp.org 17 Mar 04:18:56 ntpdate[20268]: adjust time server 61.216.153.106 offset 0.000257 sec # ceph -s cluster b6e0c604-c9dd-4eac-9b00-45ff246d64fb health HEALTH_OK monmap e2: 2 mons at {ceph-node1=192.168.1.120:6789/0,ceph-node2=192.168.1.121:6789/0} election epoch 26, quorum 0,1 ceph-node1,ceph-node2 osdmap e30: 6 osds: 6 up, 6 in flags sortbitwise,require_jewel_osds pgmap v106: 0 pgs, 0 pools, 0 bytes data, 0 objects 198 MB used, 91895 MB / 92093 MB avail
监控monitor
- 查看MON状态
使用ceph命令的mon stat或者mon dump子命令来查看monitor的状态和map信息。
# ceph mon stat e2: 2 mons at {ceph-node1=192.168.1.120:6789/0,ceph-node2=192.168.1.121:6789/0}, election epoch 26, quorum 0,1 ceph-node1,ceph-node2 # ceph mon dump dumped monmap epoch 2 epoch 2 fsid b6e0c604-c9dd-4eac-9b00-45ff246d64fb last_changed 2017-03-16 10:10:30.700537 created 2017-03-16 09:56:25.645057 0: 192.168.1.120:6789/0 mon.ceph-node1 1: 192.168.1.121:6789/0 mon.ceph-node2
- 查看MON的仲裁状态
在IO操作中,客户端会首先尝试与仲裁中的Leader Mon建立连接。如果leader不可用,客户端会以此尝试连接其他的mon。
# ceph quorum_status -f json-pretty { "election_epoch": 26, "quorum": [ 0, 1 ], "quorum_names": [ "ceph-node1", "ceph-node2" ], "quorum_leader_name": "ceph-node1", "monmap": { "epoch": 2, "fsid": "b6e0c604-c9dd-4eac-9b00-45ff246d64fb", "modified": "2017-03-16 10:10:30.700537", "created": "2017-03-16 09:56:25.645057", "mons": [ { "rank": 0, "name": "ceph-node1", "addr": "192.168.1.120:6789\/0" }, { "rank": 1, "name": "ceph-node2", "addr": "192.168.1.121:6789\/0" } ] } }
监控OSD
- OSD tree
OSD tree会显示每个节点上所有OSD及其在CRUSH map中的位置。
# ceph osd tree ID WEIGHT TYPE NAME UP/DOWN REWEIGHT PRIMARY-AFFINITY -1 0.08752 root default -2 0.04376 host ceph-node1 0 0.01459 osd.0 up 1.00000 1.00000 1 0.01459 osd.1 up 1.00000 1.00000 2 0.01459 osd.2 up 1.00000 1.00000 -3 0.04376 host ceph-node2 3 0.01459 osd.3 up 1.00000 1.00000 4 0.01459 osd.4 up 1.00000 1.00000 5 0.01459 osd.5 up 1.00000 1.00000
- 查看CRUSH map
# ceph osd crush rule list [ "replicated_ruleset" ] # ceph osd crush rule dump "replicated_ruleset" { "rule_id": 0, "rule_name": "replicated_ruleset", "ruleset": 0, "type": 1, "min_size": 1, "max_size": 10, "steps": [ { "op": "take", "item": -1, "item_name": "default" }, { "op": "chooseleaf_firstn", "num": 0, "type": "host" }, { "op": "emit" } ] }
- 监控PG
# ceph pg stat v107: 0 pgs: ; 0 bytes data, 198 MB used, 91895 MB / 92093 MB avail
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