标签（空格分隔）： ceph，ceph运维，osdmap
方法一：
最直接，简单的命令：
[root@node3 ~]# ceph osd tree
ID CLASS WEIGHT TYPE NAME STATUS REWEIGHT PRI-AFF
-1 0.05878 root default
-3 0.01959 host node1
0 hdd 0.00980 osd.0 up 1.00000 1.00000
-5 0.01959 host node2
1 hdd 0.00980 osd.1 up 1.00000 1.00000
-7 0.01959 host node3
2 hdd 0.00980 osd.2 up 1.00000 1.00000
这个命令获取的信息较为简单，下面的是获取详细信息的命令
[root@node3 ~]# ceph osd dump
osdmaptool: osdmap file 'osdmap'
epoch 40
fsid b8b4aa68-d825-43e9-a60a-781c92fec20e
created 2017-10-16 15:51:13.675888
modified 2017-10-16 16:14:25.041923
flags sortbitwise,recovery_deletes,purged_snapdirs
crush_version 13
full_ratio 0.95
backfillfull_ratio 0.9
nearfull_ratio 0.85
require_min_compat_client jewel
min_compat_client jewel
require_osd_release luminous
pool 1 'rbd' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 64 pgp_num 64 last_change 26 flags hashpspool stripe_width 0
max_osd 3
osd.0 up in weight 1 up_from 30 up_thru 38 down_at 28 last_clean_interval [5,29) 192.168.197.154:6801/7155 192.168.197.154:6809/1007155 192.168.197.154:6810/1007155 192.168.197.154:6811/1007155 exists,up 26c07bad-69d3-4c9f-80ee-9c0af7c9fc92
osd.1 up in weight 1 up_from 35 up_thru 38 down_at 31 last_clean_interval [9,28) 192.168.197.156:6800/6496 192.168.197.156:6801/6496 192.168.197.156:6802/6496 192.168.197.156:6803/6496 exists,up 013fafd1-cfde-48e7-82ed-1e5c0d7c0b74
osd.2 up in weight 1 up_from 35 up_thru 35 down_at 29 last_clean_interval [13,28) 192.168.197.157:6800/6433 192.168.197.157:6801/6433 192.168.197.157:6802/6433 192.168.197.157:6803/6433 exists,up f9c20128-2c2d-46ba-adfd-12e8263d3077
这里的epoch 40表示的是osdmap的版本号，说明当前的osdmap的版本号为40
方法二：
1. 从集群获取osdmap：
[root@node3 ~]# ceph osd getmap -o osdmap
got osdmap epoch 40
这里的epoch 40表示的是osdmap的版本号，说明当前的osdmap的版本号为40
2. 查看上一步获取的osdmap：
[root@node3 ~]# osdmaptool --print osdmap
osdmaptool: osdmap file 'osdmap'
epoch 40
fsid b8b4aa68-d825-43e9-a60a-781c92fec20e
created 2017-10-16 15:51:13.675888
modified 2017-10-16 16:14:25.041923
flags sortbitwise,recovery_deletes,purged_snapdirs
crush_version 13
full_ratio 0.95
backfillfull_ratio 0.9
nearfull_ratio 0.85
require_min_compat_client jewel
min_compat_client jewel
require_osd_release luminous
pool 1 'rbd' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 64 pgp_num 64 last_change 26 flags hashpspool stripe_width 0
max_osd 3
osd.0 up in weight 1 up_from 30 up_thru 38 down_at 28 last_clean_interval [5,29) 192.168.197.154:6801/7155 192.168.197.154:6809/1007155 192.168.197.154:6810/1007155 192.168.197.154:6811/1007155 exists,up 26c07bad-69d3-4c9f-80ee-9c0af7c9fc92
osd.1 up in weight 1 up_from 35 up_thru 38 down_at 31 last_clean_interval [9,28) 192.168.197.156:6800/6496 192.168.197.156:6801/6496 192.168.197.156:6802/6496 192.168.197.156:6803/6496 exists,up 013fafd1-cfde-48e7-82ed-1e5c0d7c0b74
osd.2 up in weight 1 up_from 35 up_thru 35 down_at 29 last_clean_interval [13,28) 192.168.197.157:6800/6433 192.168.197.157:6801/6433 192.168.197.157:6802/6433 192.168.197.157:6803/6433 exists,up f9c20128-2c2d-46ba-adfd-12e8263d3077