LINSTOR Is Like Kubernetes, But for Block Devices

1. LINSTOR Is Like Kubernetes, But for Block Devices Andrei Kvapil Solutions Architect

2. Andrei Kvapil Where I work What I do Architectural solutions based on Kubernetes Designing and developing cloud platforms Software-defined storage Solutions Architect What we do Providing DevOps/SRE as a service Providing consulting Contributing to Open Source andrei.kvapil@palark.com

3. Disclaimer My opinion != LINBIT’s opinion

15. VM

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41. VM VM VM VM VM

42. VM VM VM VM VM iSCSI

43. VM VM VM VM VM

44. VM VM VM VM VM

45. VM VM VM VM VM

46. VM VM VM VM VM

47. VM VM VM VM VM

48. VM VM VM VM VM

49. VM VM VM VM VM

50. VM VM VM VM VM

51. VM VM VM VM VM NFS

52. VM VM VM VM VM iSCSI NFS

53. VM VM VM VM VM iSCSI own protocol NFS

54. VM VM VM VM VM

55. VM VM VM VM VM

56. VM VM VM VM VM iSCSI

57. How was it?

59. Storage 1 Storage 2

60. Storage 1 Storage 2

61. Storage 1 Storage 2 md0 md0

62. Storage 1 Storage 2 md0 md0 DRBD secondary DRBD secondary

63. Storage 1 Storage 2 md0 md0 DRBD secondary DRBD secondary

64. Storage 1 Storage 2 md0 md0 DRBD primary DRBD secondary

65. Storage 1 Storage 2 md0 md0 DRBD primary DRBD secondary LVM LVM

66. Storage 1 Storage 2 md0 md0 DRBD primary DRBD secondary LVM vm1 LVM vm1

67. Storage 1 Storage 2 md0 md0 DRBD primary DRBD secondary LVM vm1 vm2 LVM vm1 vm2

68. Storage 1 Storage 2 md0 md0 DRBD primary DRBD secondary LVM vm1 vm2 vm3 LVM vm1 vm2 vm3

69. Storage 1 Storage 2 md0 md0 DRBD primary DRBD secondary LVM vm1 vm2 vm3 LVM vm1 vm2 vm3 VM VM VM

70. Storage 1 Storage 2 md0 md0 DRBD secondary DRBD secondary LVM vm1 vm2 vm3 LVM vm1 vm2 vm3 VM VM VM

71. Storage 1 md0 DRBD secondary LVM vm1 vm2 vm3 VM VM VM Storage 2 md0 DRBD secondary LVM vm1 vm2 vm3

72. Storage 1 md0 DRBD secondary LVM vm1 vm2 vm3 VM VM VM Storage 2 md0 DRBD primary LVM vm1 vm2 vm3

78. Storage 1 md0 DRBD secondary LVM vm1 vm2 vm3 VM VM VM Storage 2 md0 DRBD primary LVM vm1 vm2 vm3 iSCSI

79. Storage 1 md0 DRBD secondary LVM vm1 vm2 vm3 VM VM VM Storage 2 md0 DRBD primary LVM vm1 vm2 vm3 iSCSI NFS

80. Storage 1 md0 DRBD secondary ext4 vm1 vm2 vm3 VM VM VM Storage 2 md0 DRBD primary ext4 vm1 vm2 vm3 iSCSI NFS

81. Storage 1 md0 Storage 2 md0 ext4 vm1 vm2 vm3 ext4 vm1 vm2 vm3 DRBD secondary DRBD primary

82. vm1 vm2 vm3 vm1 vm2 vm3 Storage 1 md0 Storage 2 md0 DRBD secondary DRBD primary

83. Storage 1 md0 Storage 2 md0 vm1 vm2 vm3 vm1 vm2 vm3 DRBD primary DRBD primary

84. Storage 1 md0 Storage 2 md0 gfs2 vm1 vm2 vm3 gfs2 vm1 vm2 vm3 DRBD primary DRBD primary

85. Storage 1 md0 Storage 2 md0 ocfs2 vm1 vm2 vm3 ocfs2 vm1 vm2 vm3 DRBD primary DRBD primary

86. Storage 1 md0 Storage 2 md0 ocfs2 vm1 vm2 vm3 ocfs2 vm1 vm2 vm3 DRBD primary DRBD primary VM VM VM

90. How is it now?

91. VM VM VM VM VM

92. VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM

93. VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM

94. VM VM VM VM VM VM VM VM VM VM VM VM VM VM

105. VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM

106. Architecture

108. storage backend etcd

109. storage backend etcd etcd

110. storage backend etcd etcd communication interface API

111. storage backend etcd etcd communication interface API API

112. storage backend etcd etcd communication interface API API scheduler Scheduler

113. storage backend etcd etcd communication interface API API scheduler Scheduler Autoplacer

114. storage backend etcd etcd communication interface API API scheduler Scheduler Autoplacer control logic Controller-manager

115. storage backend etcd etcd communication interface API API scheduler Scheduler Autoplacer control logic Controller-manager Controller

116. storage backend etcd etcd communication interface API API scheduler Scheduler Autoplacer control logic Controller-manager Controller Prometheus-exporter Metrics

117. storage backend etcd etcd communication interface API API scheduler Scheduler Autoplacer control logic Controller-manager Controller Prometheus-exporter Metrics Metrics

118. storage backend etcd etcd communication interface API API scheduler Scheduler Autoplacer control logic Controller-manager Controller Prometheus-exporter Metrics Metrics running resources Kubelet

119. storage backend etcd etcd communication interface API API scheduler Scheduler Autoplacer control logic Controller-manager Controller Prometheus-exporter Metrics Metrics running resources Kubelet Satellite

120. Interface

122. basic unit pod workload

123. basic unit pod resource workload drbd-resource

124. basic unit pod resource made up of container workload drbd-resource

125. basic unit pod resource made up of container volume workload drbd-resource

126. basic unit pod resource made up of container volume set of units deployment group of pods workload drbd-resource

127. basic unit pod resource made up of container volume set of units deployment resource-deﬁnition group of pods group of drbd resources workload drbd-resource

128. basic unit pod resource made up of container volume set of units deployment resource-deﬁnition physical node node group of pods group of drbd resources workload drbd-resource

129. basic unit pod resource made up of container volume set of units deployment resource-deﬁnition physical node node node group of pods group of drbd resources workload drbd-resource

130. basic unit pod resource made up of container volume set of units deployment resource-deﬁnition physical node node node key/value labels labels group of pods group of drbd resources workload drbd-resource

131. basic unit pod resource made up of container volume set of units deployment resource-deﬁnition physical node node node key/value labels labels aux-properties group of pods group of drbd resources workload drbd-resource

132. basic unit pod resource made up of container volume set of units deployment resource-deﬁnition physical node node node key/value labels labels aux-properties storage parameters storageClass group of pods group of drbd resources workload drbd-resource

133. basic unit pod resource made up of container volume set of units deployment resource-deﬁnition physical node node node key/value labels labels aux-properties storage parameters storageClass resource-group group of pods group of drbd resources workload drbd-resource

134. basic unit pod resource volume set of resources deployment resource-deﬁnition physical node node node key/value labels labels aux-properties storage parameters storageClass resource-group group of pods group of drbd resources workload drbd-resource container made up of

135. resource made up of volume set of resources deployment resource-deﬁnition physical node node node key/value labels labels aux-properties storage parameters storageClass resource-group group of pods group of drbd resources drbd-resource container pod basic unit

136. resource made up of volume set of resources deployment resource-deﬁnition physical node node node key/value labels labels aux-properties storage parameters storageClass resource-group group of pods group of drbd resources drbd-resource container pod basic unit

137. made up of volume set of resources deployment resource-deﬁnition physical node node node key/value labels labels aux-properties storage parameters storageClass resource-group group of pods group of drbd resources container pod resource basic unit

138. basic unit made up of volume deployment physical node node node key/value labels labels aux-properties storage parameters storageClass resource-group group of pods container pod resource resource-deﬁnition set of resources

139. basic unit made up of volume deployment physical node node node key/value labels labels aux-properties storage parameters storageClass resource-group group of pods container pod resource resource-deﬁnition set of resources

140. basic unit made up of volume set of resources deployment physical node node node key/value labels labels aux-properties group of pods container pod resource resource-deﬁnition storageClass resource-group storage parameters

141. How are they different?

142. pools to host volumes storage-pools storage layers layers drbd resources resources

143. pools to host volumes storage-pools storage layers layers drbd resources resources

144. pools to host volumes storage-pools storage layers layers drbd resources resources - - -

145. pools to host volumes storage layers layers drbd resources resources - - - storage-pools

146. node1 node4 node2 node5 node3 node6

147. linstor node list node1 node4 node2 node5 node3 node6

154. node1 LVM node4 LVM node2 LVM node5 LVM node3 LVM node6 LVM

155. node1 LVM node4 LVM node2 LVM node5 LVM node3 LVM node6 LVM linstor storage-pool list

169. Hardware HDD SSD NVMe

170. Hardware HDD SSD NVMe Node-level volume management LVM ZFS

171. Hardware Node-level volume management HDD SSD NVMe LVM ZFS Block storage features LUKS VDO DM-Cache

172. Hardware Node-level volume management Block storage features HDD SSD NVMe LVM ZFS LUKS VDO DM-Cache Block transport systems DRBD NVMe-oF

173. Hardware Node-level volume management Block storage features Block transport systems HDD SSD NVMe LVM ZFS LUKS VDO DM-Cache DRBD NVMe-oF

177. node1 LVM node4 LVM node2 LVM node5 LVM node3 LVM node6 LVM resource-deﬁnition-1

178. node1 LVM node4 LVM node2 LVM node5 LVM node3 LVM node6 LVM resource-deﬁnition-1 resource resource

183. node1 LVM node4 LVM node2 LVM node5 LVM node3 LVM node6 LVM resource-deﬁnition-1 resource resource resource-deﬁnition-2

184. node1 LVM node4 LVM node2 LVM node5 LVM node3 LVM node6 LVM resource-deﬁnition-1 resource resource resource-deﬁnition-2 linstor resource-definition list -r test1

198. node1 LVM node4 LVM node2 LVM node5 LVM node3 LVM node6 LVM resource-deﬁnition-1 resource resource resource-deﬁnition-2

199. node1 LVM node4 LVM node2 LVM node5 LVM node3 LVM node6 LVM resource-deﬁnition-1 resource resource resource resource resource-deﬁnition-2

200. node1 LVM node4 LVM node2 LVM node5 LVM node3 LVM node6 LVM resource-deﬁnition-1 resource resource resource-deﬁnition-2 resource resource

201. node1 LVM node4 LVM node2 LVM node5 LVM node3 LVM node6 LVM resource-deﬁnition-1 resource resource resource-deﬁnition-2 resource resource

203. node1 LVM node4 LVM node2 LVM node5 LVM node3 LVM node6 LVM resource-deﬁnition-1 resource resource resource resource resource-deﬁnition-2 linstor resource list -r test1

218. Use Kubernetes PVC

219. resource-group spawn Use Kubernetes PVC

220. linstor resource-group list -r default

239. resource-group spawn Use Kubernetes PVC

240. resource create --auto-place 2 resource-group spawn Use Kubernetes PVC

241. linstor resource-definition create test3 --resource-group default

242. linstor resource-definition create test3 --resource-group default resource-deﬁnition

243. linstor resource-definition create test3 --resource-group default resource-deﬁnition resource-group

244. linstor resource-definition create test3 --resource-group default resource-deﬁnition linstor volume-definition create test3 10G resource-group

246. linstor resource-definition create test3 --resource-group default resource-deﬁnition linstor volume-definition create test3 10G linstor create test3 --auto-place 2 resource-group

247. linstor resource-definition create test3 --resource-group default linstor volume-definition create test3 10G linstor create test3 --auto-place 2 resource-deﬁnition resource resource resource diskless resource-group

248. linstor resource-definition create test3 --resource-group default linstor volume-definition create test3 10G linstor create test3 --auto-place 2 resource-deﬁnition resource resource resource diskless linstor resource list -r test3 resource-group

253. resource create --auto-place 2 resource-group spawn Use Kubernetes PVC

254. resource create node1 -s storpool resource create node2 -s storpool resource create --auto-place 2 resource-group spawn Use Kubernetes PVC

255. linstor resource-definition create test4 --resource-group default

256. linstor resource-definition create test4 --resource-group default resource-deﬁnition

257. linstor resource-definition create test4 --resource-group default resource-deﬁnition resource-group

260. linstor resource-definition create test4 --resource-group default resource-deﬁnition linstor volume-definition create test4 10G linstor resource create node1 test4 -s ssd-lvmthin resource-group

261. linstor resource-definition create test4 --resource-group default linstor volume-definition create test4 10G linstor resource create node1 test4 -s ssd-lvmthin resource-deﬁnition resource resource-group

262. linstor resource-definition create test4 --resource-group default linstor volume-definition create test4 10G linstor resource create node1 test4 -s ssd-lvmthin resource-deﬁnition resource linstor resource create node2 test4 -s ssd-lvmthin resource-group

263. linstor resource-definition create test4 --resource-group default linstor volume-definition create test4 10G linstor resource create node1 test4 -s ssd-lvmthin resource-deﬁnition resource resource linstor resource create node2 test4 -s ssd-lvmthin resource diskless resource-group

264. linstor resource-definition create test4 --resource-group default linstor volume-definition create test4 10G linstor resource create node1 test4 -s ssd-lvmthin resource-deﬁnition resource resource linstor resource list -r test4 linstor resource create node2 test4 -s ssd-lvmthin resource diskless resource-group

272. VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM iSCSI

275. linstor resource create node3 test4 --diskless

276. linstor resource list -r test4 linstor resource create node3 test4 --diskless

284. VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM

285. VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM

286. VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM

287. linstor-controller linstor-satellite

288. user linstor-controller linstor-satellite

292. user linstor-controller linstor-satellite /var/lib/linstor.d/test4.res

293. user linstor-controller linstor-satellite /var/lib/linstor.d/test4.res drbdadm adjust test4

294. drbdadm drbdsetup

299. Using DRBD

300. resource create node1 -s storpool resource create node2 -s storpool resource create --auto-place 2 resource-group spawn Use Kubernetes PVC

301. DEEPER!!1! resource create node1 -s storpool resource create node2 -s storpool resource create --auto-place 2 resource-group spawn Use Kubernetes PVC

302. cat /var/lib/linstor.d/test4.res

304. resource "test4" { options { on-no-quorum io-error; quorum majority; } on node1 { volume 0 { disk /dev/linstor_data/test4_00000; device minor 1008; } node-id 0; } on node2 { volume 0 { disk /dev/drbd/this/is/not/used; device minor 1008; } node-id 1; } on node3 { volume 0 { disk none; device minor 1008; } node-id 2; } }

308. resource "test4" { options { on-no-quorum io-error; quorum majority; } on node1 { volume 0 { disk /dev/linstor_data/test4_00000; device minor 1008; } node-id 0; } on node2 { volume 0 { disk /dev/drbd/this/is/not/used; device minor 1008; } node-id 1; } on node3 { volume 0 { disk none; device minor 1008; } node-id 2; } } node1 node2 node3

321. resource "test4" { options { on-no-quorum io-error; quorum majority; } on node1 { volume 0 { disk /dev/linstor_data/test4_00000; device minor 1008; } node-id 0; } on node2 { volume 0 { disk /dev/drbd/this/is/not/used; device minor 1008; } node-id 1; } on node3 { volume 0 { disk none; device minor 1008; } node-id 2; } } node2 node3 node1 node1:/# drbdadm status test4 test4 role:Secondary disk:UpToDate node2 role:Secondary peer-disk:UpToDate node3 role:Secondary peer-disk:Diskless

322. node1 resource "test4" { options { on-no-quorum io-error; quorum majority; } on node1 { volume 0 { disk /dev/linstor_data/test4_00000; device minor 1008; } node-id 0; } on node2 { volume 0 { disk /dev/drbd/this/is/not/used; device minor 1008; } node-id 1; } on node3 { volume 0 { disk none; device minor 1008; } node-id 2; } } node3 node1:/# drbdadm status test4 test4 role:Secondary disk:UpToDate node2 role:Secondary peer-disk:UpToDate node3 role:Secondary peer-disk:Diskless node2 node2:/# drbdadm status test4 test4 role:Secondary disk:UpToDate node1 role:Secondary peer-disk:UpToDate node3 role:Secondary peer-disk:Diskless

323. node2 node1 resource "test4" { options { on-no-quorum io-error; quorum majority; } on node1 { volume 0 { disk /dev/linstor_data/test4_00000; device minor 1008; } node-id 0; } on node2 { volume 0 { disk /dev/drbd/this/is/not/used; device minor 1008; } node-id 1; } on node3 { volume 0 { disk none; device minor 1008; } node-id 2; } } node1:/# drbdadm status test4 test4 role:Secondary disk:UpToDate node2 role:Secondary peer-disk:UpToDate node3 role:Secondary peer-disk:Diskless node2:/# drbdadm status test4 test4 role:Secondary disk:UpToDate node1 role:Secondary peer-disk:UpToDate node3 role:Secondary peer-disk:Diskless node3 node3:/# drbdadm status test4 test4 role:Secondary disk:Diskless node1 role:Secondary peer-disk:UpToDate node2 role:Secondary peer-disk:UpToDate

324. node3:/# drbdadm status test4 test4 role:Secondary disk:Diskless node1 role:Secondary peer-disk:UpToDate node2 role:Secondary peer-disk:UpToDate node2:/# drbdadm status test4 test4 role:Secondary disk:UpToDate node1 role:Secondary peer-disk:UpToDate node3 role:Secondary peer-disk:Diskless node1:/# drbdadm status test4 test4 role:Secondary disk:UpToDate node2 role:Secondary peer-disk:UpToDate node3 role:Secondary peer-disk:Diskless node1 node2 node3 resource "test4" { options { on-no-quorum io-error; quorum majority; } on node1 { volume 0 { disk /dev/linstor_data/test4_00000; device minor 1008; } node-id 0; } on node2 { volume 0 { disk /dev/drbd/this/is/not/used; device minor 1008; } node-id 1; } on node3 { volume 0 { disk none; device minor 1008; } node-id 2; } }

329. Managing connections

330. drbdadm disconnect drbdadm connect Managing connections

331. node3:/# drbdadm status test4 test4 role:Secondary disk:Diskless node1 role:Secondary peer-disk:UpToDate node2 role:Secondary peer-disk:UpToDate node2:/# drbdadm status test4 test4 role:Secondary disk:UpToDate node1 role:Secondary peer-disk:UpToDate node3 role:Secondary peer-disk:Diskless node1:/# drbdadm status test4 test4 role:Secondary disk:UpToDate node2 role:Secondary peer-disk:UpToDate node3 role:Secondary peer-disk:Diskless node1 node2 node3

332. node3:/# drbdadm status test4 test4 role:Secondary disk:Diskless node1 role:Secondary peer-disk:UpToDate node2 role:Secondary peer-disk:UpToDate node2:/# drbdadm status test4 test4 role:Secondary disk:UpToDate node1 role:Secondary peer-disk:UpToDate node3 role:Secondary peer-disk:Diskless node1:/# drbdadm status test4 test4 role:Secondary disk:UpToDate node2 role:Secondary peer-disk:UpToDate node3 role:Secondary peer-disk:Diskless node2 node3 node1:/# drbdadm disconnect test4 node1

333. node3:/# drbdadm status test4 test4 role:Secondary disk:Diskless node1 role:Secondary peer-disk:UpToDate node2 role:Secondary peer-disk:UpToDate node2:/# drbdadm status test4 test4 role:Secondary disk:UpToDate node1 role:Secondary peer-disk:UpToDate node3 role:Secondary peer-disk:Diskless node1:/# drbdadm status test4 test4 role:Secondary disk:UpToDate node2 role:Secondary peer-disk:UpToDate node3 role:Secondary peer-disk:Diskless node1:/# drbdadm disconnect test4 node2 node3 node1

336. node3:/# drbdadm status test4 test4 role:Secondary disk:Diskless node1 connection:Connecting node2 role:Secondary peer-disk:UpToDate node2:/# drbdadm status test4 test4 role:Secondary disk:UpToDate node1 connection:Connecting node3 role:Secondary peer-disk:Diskless node1:/# drbdadm status test4 test4 role:Secondary disk:UpToDate quorum:no node2 connection:StandAlone node3 connection:StandAlone node1:/# drbdadm disconnect test4 node2 node3 node1

337. node3:/# drbdadm status test4 test4 role:Secondary disk:Diskless node1 connection:Connecting node2 role:Secondary peer-disk:UpToDate node2:/# drbdadm status test4 test4 role:Secondary disk:UpToDate node1 connection:Connecting node3 role:Secondary peer-disk:Diskless node1:/# drbdadm status test4 test4 role:Secondary disk:UpToDate quorum:no node2 connection:StandAlone node3 connection:StandAlone node2 node3 node1

338. node3:/# drbdadm status test4 test4 role:Secondary disk:Diskless node1 connection:Connecting node2 role:Secondary peer-disk:UpToDate node2:/# drbdadm status test4 test4 role:Secondary disk:UpToDate node1 connection:Connecting node3 role:Secondary peer-disk:Diskless node1:/# drbdadm status test4 test4 role:Secondary disk:UpToDate quorum:no node2 connection:StandAlone node3 connection:StandAlone node1:/# drbdadm connect test4 node2 node3 node1

343. node3:/# drbdadm status test4 test4 role:Secondary disk:Diskless node1 role:Secondary peer-disk:UpToDate node2 role:Secondary peer-disk:UpToDate node2:/# drbdadm status test4 test4 role:Secondary disk:UpToDate node1 role:Secondary peer-disk:UpToDate node3 role:Secondary peer-disk:Diskless node1:/# drbdadm status test4 test4 role:Secondary disk:UpToDate node2 role:Secondary peer-disk:UpToDate node3 role:Secondary peer-disk:Diskless node1:/# drbdadm connect test4 node2 node3 node1

344. node3:/# drbdadm status test4 test4 role:Secondary disk:Diskless node1 role:Secondary peer-disk:UpToDate node2 role:Secondary peer-disk:UpToDate node2:/# drbdadm status test4 test4 role:Secondary disk:UpToDate node1 role:Secondary peer-disk:UpToDate node3 role:Secondary peer-disk:Diskless node1:/# drbdadm status test4 test4 role:Secondary disk:UpToDate node2 role:Secondary peer-disk:UpToDate node3 role:Secondary peer-disk:Diskless node2 node3 node1

345. node3:/# drbdadm status test4 test4 role:Secondary disk:Diskless node1 role:Secondary peer-disk:UpToDate node2 role:Secondary peer-disk:UpToDate node2:/# drbdadm status test4 test4 role:Secondary disk:UpToDate node1 role:Secondary peer-disk:UpToDate node3 role:Secondary peer-disk:Diskless node1:/# drbdadm status test4 test4 role:Secondary disk:UpToDate node2 role:Secondary peer-disk:UpToDate node3 role:Secondary peer-disk:Diskless node1:/# drbdadm disconnect test4:node3 node2 node3 node1

LINSTOR Is Like Kubernetes, But for Block Devices

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