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
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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