今天就跟大家聊聊有关怎么使用crushtool，可能很多人都不太了解，为了让大家更加了解，小编给大家总结了以下内容，希望大家根据这篇文章可以有所收获。
#使用crushtool 创建一个命名为crushmap128的crushmap（二进制，未解码），包含128个osd设备，每个host包含8个osd，每个机架里包含4个host，所有的rack都在一个root default里
crushtool --outfn crushmap128 --build --num_osds 128 host straw 8 rack straw 4 default straw 0
或者使用straw2算法
crushtool --outfn crushmap128 --build --num_osds 128 host straw2 8 rack straw2 4 default straw2 0
解码
crushtool -d crushmap128 -o map128.txt
显示 ceph osd tree
crushtool -i crushmap128 --tree
[root@ceph01 test]# crushtool -i crushmap128 --tree
ID WEIGHT TYPE NAME
-21 128.00000 default default
-17 32.00000 rack rack0
-1 8.00000 host host0
0 1.00000 osd.0
1 1.00000 osd.1
2 1.00000 osd.2
3 1.00000 osd.3
4 1.00000 osd.4
5 1.00000 osd.5
6 1.00000 osd.6
7 1.00000 osd.7
-2 8.00000 host host1
8 1.00000 osd.8
9 1.00000 osd.9
10 1.00000 osd.10
11 1.00000 osd.11
12 1.00000 osd.12
13 1.00000 osd.13
14 1.00000 osd.14
15 1.00000 osd.15
-3 8.00000 host host2
16 1.00000 osd.16
17 1.00000 osd.17
18 1.00000 osd.18
19 1.00000 osd.19
20 1.00000 osd.20
21 1.00000 osd.21
22 1.00000 osd.22
23 1.00000 osd.23
-4 8.00000 host host3
24 1.00000 osd.24
25 1.00000 osd.25
26 1.00000 osd.26
27 1.00000 osd.27
28 1.00000 osd.28
29 1.00000 osd.29
30 1.00000 osd.30
31 1.00000 osd.31
-18 32.00000 rack rack1
-5 8.00000 host host4
32 1.00000 osd.32
33 1.00000 osd.33
34 1.00000 osd.34
35 1.00000 osd.35
36 1.00000 osd.36
37 1.00000 osd.37
38 1.00000 osd.38
39 1.00000 osd.39
-6 8.00000 host host5
40 1.00000 osd.40
41 1.00000 osd.41
42 1.00000 osd.42
43 1.00000 osd.43
44 1.00000 osd.44
45 1.00000 osd.45
46 1.00000 osd.46
47 1.00000 osd.47
-7 8.00000 host host6
48 1.00000 osd.48
49 1.00000 osd.49
50 1.00000 osd.50
51 1.00000 osd.51
52 1.00000 osd.52
53 1.00000 osd.53
54 1.00000 osd.54
55 1.00000 osd.55
-8 8.00000 host host7
56 1.00000 osd.56
57 1.00000 osd.57
58 1.00000 osd.58
59 1.00000 osd.59
60 1.00000 osd.60
61 1.00000 osd.61
62 1.00000 osd.62
63 1.00000 osd.63
-19 32.00000 rack rack2
-9 8.00000 host host8
64 1.00000 osd.64
65 1.00000 osd.65
66 1.00000 osd.66
67 1.00000 osd.67
68 1.00000 osd.68
69 1.00000 osd.69
70 1.00000 osd.70
71 1.00000 osd.71
-10 8.00000 host host9
72 1.00000 osd.72
73 1.00000 osd.73
74 1.00000 osd.74
75 1.00000 osd.75
76 1.00000 osd.76
77 1.00000 osd.77
78 1.00000 osd.78
79 1.00000 osd.79
-11 8.00000 host host10
80 1.00000 osd.80
81 1.00000 osd.81
82 1.00000 osd.82
83 1.00000 osd.83
84 1.00000 osd.84
85 1.00000 osd.85
86 1.00000 osd.86
87 1.00000 osd.87
-12 8.00000 host host11
88 1.00000 osd.88
89 1.00000 osd.89
90 1.00000 osd.90
91 1.00000 osd.91
92 1.00000 osd.92
93 1.00000 osd.93
94 1.00000 osd.94
95 1.00000 osd.95
-20 32.00000 rack rack3
-13 8.00000 host host12
96 1.00000 osd.96
97 1.00000 osd.97
98 1.00000 osd.98
99 1.00000 osd.99
100 1.00000 osd.100
101 1.00000 osd.101
102 1.00000 osd.102
103 1.00000 osd.103
-14 8.00000 host host13
104 1.00000 osd.104
105 1.00000 osd.105
106 1.00000 osd.106
107 1.00000 osd.107
108 1.00000 osd.108
109 1.00000 osd.109
110 1.00000 osd.110
111 1.00000 osd.111
-15 8.00000 host host14
112 1.00000 osd.112
113 1.00000 osd.113
114 1.00000 osd.114
115 1.00000 osd.115
116 1.00000 osd.116
117 1.00000 osd.117
118 1.00000 osd.118
119 1.00000 osd.119
-16 8.00000 host host15
120 1.00000 osd.120
121 1.00000 osd.121
122 1.00000 osd.122
123 1.00000 osd.123
124 1.00000 osd.124
125 1.00000 osd.125
126 1.00000 osd.126
127 1.00000 osd.127
编辑role规则
vim map128.txt #修改rule部分
###3副本都在一个rack且在同一个host内
rule replicated_ruleset {
ruleset 0
type replicated
min_size 1
max_size 10
step take default
step choose firstn 1 type host
step chooseleaf firstn 3 type osd
step emit
}
测试结果(测试规则0 ，总共1..5个对象, 3副本)
rule 0 (replicated_ruleset), x = 1..5, numrep = 3..3
CRUSH rule 0 x 1 [80,84,87] 对象1的3个副本在 osd.80，osd.84,osd.87
CRUSH rule 0 x 2 [63,58,61] 对象2的3个副本在 osd.63，osd.58,osd.61
CRUSH rule 0 x 3 [121,127,124]
CRUSH rule 0 x 4 [67,71,65]
CRUSH rule 0 x 5 [45,47,46]###3副本都在一个rack里，可能在同一个host内
rule replicated_ruleset {
ruleset 0
type replicated
min_size 1
max_size 10
step take default
step choose firstn 1 type rack
step chooseleaf firstn 3 type osd
step emit
}
测试结果
rule 0 (replicated_ruleset), x = 1..5, numrep = 3..3
CRUSH rule 0 x 1 [80,84,67]
CRUSH rule 0 x 2 [63,50,48]
CRUSH rule 0 x 3 [121,127,111]
CRUSH rule 0 x 4 [67,86,79]
CRUSH rule 0 x 5 [45,38,46]###3副本都在一个rack里，不在同一个host内
rule replicated_ruleset {
ruleset 0
type replicated
min_size 1
max_size 10
step take default
step choose firstn 1 type rack
step chooseleaf firstn 3 type host
step emit
}
测试结果
rule 0 (replicated_ruleset), x = 1..5, numrep = 3..3
CRUSH rule 0 x 1 [80,70,79]
CRUSH rule 0 x 2 [63,48,42]
CRUSH rule 0 x 3 [121,109,113]
CRUSH rule 0 x 4 [67,82,76]
CRUSH rule 0 x 5 [45,36,57]###3副本在3个rack里
rule replicated_ruleset {
ruleset 0
type replicated
min_size 1
max_size 10
step take default
step choose firstn 3 type rack
step chooseleaf firstn 1 type host
step emit
}
测试结果
rule 0 (replicated_ruleset), x = 1..5, numrep = 3..3
CRUSH rule 0 x 1 [80,115,43]
CRUSH rule 0 x 2 [63,7,126]
CRUSH rule 0 x 3 [121,30,73]
CRUSH rule 0 x 4 [67,8,61]
CRUSH rule 0 x 5 [45,79,28]编码
crushtool -c map128.txt -o maptmp.bin
测试
显示统计信息 测试rule0 上传对象最小1个最多5个 3副本 显示映射关系 显示ceph osd tree
crushtool -i maptmp.bin --test --show-statistics --rule 0 --min-x 1 --max-x 5 --num-rep 3 --show-mappings --tree
#添加机架
ceph osd crush add-bucket rack01 rack
ceph osd crush add-bucket rack02 rack
ceph osd crush add-bucket rack03 rack
#移动主机到机架
ceph osd crush move ceph23 rack=rack01
ceph osd crush move ceph24 rack=rack02
ceph osd crush move ceph25 rack=rack03
#移动机架到default root
ceph osd crush move rack01 root=default
ceph osd crush move rack02 root=default
ceph osd crush move rack03 root=default
得到新的crushmap
#移动好后使用测试的rule规则和新的crushmap导入到集群中，注意测试的crushmap中的osd编号不一定和实际的编号相同，因此子需要测试后确定rule正确即可
测试完成后导入集群
导出crushmap
ceph osd getcrushmap -o ma-crush-map
解码crushmap
crushtool -d ma-crush-map -o ma-crush-map.txt
vim ma-crush-map.txt #修改rule部分为上面测试过的rule
编译crushmap
crushtool -c ma-crush-map.txt -o ma-nouvelle-crush-map
导入crushmap
ceph osd setcrushmap -i ma-nouvelle-crush-map
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