[Kubernetes] Kubernetes 1.20.4 + Ceph rbd (Octopus) 생성 / resize (Expand)

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[Kubernetes] Kubernetes 1.20.4 + Ceph rbd (Octopus) 생성 / resize (Expand) 본문

60.Cloud/80.Kubernetes

[Kubernetes] Kubernetes 1.20.4 + Ceph rbd (Octopus) 생성 / resize (Expand)

왕영주 2021. 3. 18. 18:01

Prerequisite

Ceph Cluster
Kubernetes Cluster
Ceph와 Kubernetes가 Network으로 서로 통신이 가능해야합니다.

Ceph RBD Provisioner 사용

refer to : https://docs.ceph.com/en/latest/rbd/rbd-kubernetes/

ceph node에서 실행
ceph rbd pool 생성

root@yjwang0-ceph-01:~# ceph osd pool create kubernetes
pool 'kubernetes' created
root@yjwang0-ceph-01:~# rbd pool init kubernetes

ceph auth 생성

root@yjwang0-ceph-01:~# ceph auth get-or-create client.kubernetes mon 'profile rbd' osd 'profile rbd pool=kubernetes' mgr 'profile rbd pool=kubernetes'
[client.kubernetes]
    key = AQATC1NglDFYJhAAv/N8AkW1DQ5bMS3R3VMTtQ==

configmap 저장을 위해 아래 명령어 내용 기록

root@yjwang0-ceph-01:~# ceph mon dump |grep -E 'fsid|mon'
dumped monmap epoch 1
fsid 454a3b6e-9d06-4811-82dd-ae216b7a3fa2
min_mon_release 17 (quincy)
0: [v2:10.99.99.30:3300/0,v1:10.99.99.30:6789/0] mon.yjwang0-ceph-01
1: [v2:10.99.99.31:3300/0,v1:10.99.99.31:6789/0] mon.yjwang0-ceph-02
2: [v2:10.99.99.32:3300/0,v1:10.99.99.32:6789/0] mon.yjwang0-ceph-03

k8s node에서 실행
ceph-csi라는 provisioner를 사용할 예정이다.
위에서 확인한 정보들을 바탕으로 configmap을 생성한다. clusterID 는 fsid 의 정보를 사용하면 된다.

root@node1:~# cat csi-config-map.yaml 
---
apiVersion: v1
kind: ConfigMap
data:
  config.json: |-
    [
      {
        "clusterID": "454a3b6e-9d06-4811-82dd-ae216b7a3fa2",
        "monitors": [
          "10.99.99.30:6789",
          "10.99.99.31:6789",
          "10.99.99.32:6789"
        ]
      }
    ]
metadata:
  name: ceph-csi-config

배포

root@node1:~# kubectl apply -f csi-config-map.yaml 
configmap/ceph-csi-config created

위에서 생성한 auth 값을 이용해서 secret을 생성한다.

---
apiVersion: v1
kind: Secret
metadata:
  name: csi-rbd-secret
  namespace: default
stringData:
  userID: kubernetes
  userKey: AQATC1NglDFYJhAAv/N8AkW1DQ5bMS3R3VMTtQ==

배포

root@node1:~# kubectl apply -f csi-rbd-secret.yaml 
secret/csi-rbd-secret created

ceph-csi Plugin 설정

root@node1:~# kubectl apply -f https://raw.githubusercontent.com/ceph/ceph-csi/master/deploy/rbd/kubernetes/csi-provisioner-rbac.yaml
serviceaccount/rbd-csi-provisioner created
clusterrole.rbac.authorization.k8s.io/rbd-external-provisioner-runner created
clusterrolebinding.rbac.authorization.k8s.io/rbd-csi-provisioner-role created
role.rbac.authorization.k8s.io/rbd-external-provisioner-cfg created
rolebinding.rbac.authorization.k8s.io/rbd-csi-provisioner-role-cfg created

root@node1:~# kubectl apply -f https://raw.githubusercontent.com/ceph/ceph-csi/master/deploy/rbd/kubernetes/csi-nodeplugin-rbac.yaml
serviceaccount/rbd-csi-nodeplugin created
clusterrole.rbac.authorization.k8s.io/rbd-csi-nodeplugin created
clusterrolebinding.rbac.authorization.k8s.io/rbd-csi-nodeplugin created

refer to :https://github.com/ceph/ceph-csi/blob/8163552b814b3acd2ac2143ffe097a389d0d3220/examples/kms/vault/kms-config.yaml#L7-L15

관련 configmap 추가 생성

root@node1:~# cat kms-config.yaml 
---
apiVersion: v1
kind: ConfigMap
data:
  config.json: |-
    {
      "vault-test": {
        "encryptionKMSType": "vault",
        "vaultAddress": "http://vault.default.svc.cluster.local:8200",
        "vaultAuthPath": "/v1/auth/kubernetes/login",
        "vaultRole": "csi-kubernetes",
        "vaultPassphraseRoot": "/v1/secret",
        "vaultPassphrasePath": "ceph-csi/",
        "vaultCAVerify": "false"
      }
    }
metadata:
  name: ceph-csi-encryption-kms-config

배포

root@node1:~# kubectl apply -f kms-config.yaml 
configmap/ceph-csi-encryption-kms-config created

provisioner 및 node 서비스 설정

root@node1:~# kubectl apply -f https://raw.githubusercontent.com/ceph/ceph-csi/master/deploy/rbd/kubernetes/csi-rbdplugin-provisioner.yaml
service/csi-rbdplugin-provisioner created
deployment.apps/csi-rbdplugin-provisioner created

root@node1:~# kubectl apply -f https://raw.githubusercontent.com/ceph/ceph-csi/master/deploy/rbd/kubernetes/csi-rbdplugin.yaml
daemonset.apps/csi-rbdplugin created
service/csi-metrics-rbdplugin created

Storage class 설정

root@node1:~# cat csi-rbd-sc.yaml 
---
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
   name: csi-rbd-sc
provisioner: rbd.csi.ceph.com
allowVolumeExpansion: true
parameters:
   clusterID: 454a3b6e-9d06-4811-82dd-ae216b7a3fa2
   pool: kubernetes
   csi.storage.k8s.io/controller-expand-secret-name: csi-rbd-secret
   csi.storage.k8s.io/controller-expand-secret-namespace: default
   csi.storage.k8s.io/provisioner-secret-name: csi-rbd-secret
   csi.storage.k8s.io/provisioner-secret-namespace: default
   csi.storage.k8s.io/node-stage-secret-name: csi-rbd-secret
   csi.storage.k8s.io/node-stage-secret-namespace: default
reclaimPolicy: Delete
mountOptions:
   - discard

배포

root@node1:~# kubectl apply -f csi-rbd-sc.yaml 
storageclass.storage.k8s.io/csi-rbd-sc created

pvc 생성

root@node1:~# cat rbd-pvc.yaml 
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: test-rbd
spec:
  accessModes:
    - ReadWriteOnce
  volumeMode: Block
  resources:
    requests:
      storage: 1Gi
  storageClassName: csi-rbd-sc

배포

root@node1:~# kubectl apply -f rbd-pvc.yaml 
persistentvolumeclaim/test-rbd created

생성된 pvc 확인

root@node1:~# kubectl get pvc
NAME       STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
test-rbd   Bound    pvc-86d1aff3-c732-4557-aebb-b0cd48f3da55   1Gi        RWO            csi-rbd-sc     3s

ceph 에서 생성된 pvc 확인

root@yjwang0-ceph-01:~# rbd ls kubernetes
csi-vol-0271c4ae-87c8-11eb-8f13-fedf14d6325e

root@yjwang0-ceph-01:~# rbd info kubernetes/csi-vol-0271c4ae-87c8-11eb-8f13-fedf14d6325e
rbd image 'csi-vol-0271c4ae-87c8-11eb-8f13-fedf14d6325e':
    size 1 GiB in 256 objects
    order 22 (4 MiB objects)
    snapshot_count: 0
    id: 12f03b43b5bc
    block_name_prefix: rbd_data.12f03b43b5bc
    format: 2
    features: layering, exclusive-lock, object-map, fast-diff, deep-flatten
    op_features: 
    flags: 
    create_timestamp: Thu Mar 18 17:57:47 2021
    access_timestamp: Thu Mar 18 17:57:47 2021
    modify_timestamp: Thu Mar 18 17:57:47 2021

Expand pvc

Expand가 가능하려면 StorageClass에 아래 parameter (controller-expand-secret-*) 및 allowVolumeExpansion이 true로 돼있어야한다.

---
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
   name: csi-rbd-sc
allowVolumeExpansion: true
provisioner: rbd.csi.ceph.com
parameters:
   clusterID: 454a3b6e-9d06-4811-82dd-ae216b7a3fa2
   pool: kubernetes
   csi.storage.k8s.io/controller-expand-secret-name: csi-rbd-secret
   csi.storage.k8s.io/controller-expand-secret-namespace: default
   csi.storage.k8s.io/provisioner-secret-name: csi-rbd-secret
   csi.storage.k8s.io/provisioner-secret-namespace: default
   csi.storage.k8s.io/node-stage-secret-name: csi-rbd-secret
   csi.storage.k8s.io/node-stage-secret-namespace: default
reclaimPolicy: Delete
mountOptions:
   - discard

아래 pvc를 10GB로 Expand 진행

root@node1:~# kubectl get pvc
NAME       STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
test-rbd   Bound    pvc-6cad4f5e-0868-41e3-aac7-e86c7d887b73   5Gi        RWO            csi-rbd-sc     4m54s

root@yjwang0-ceph-01:~# rbd info kubernetes/csi-vol-dfb3b58c-8860-11eb-8f13-fedf14d6325e
rbd image 'csi-vol-dfb3b58c-8860-11eb-8f13-fedf14d6325e':
    size 5 GiB in 1280 objects
    order 22 (4 MiB objects)
    snapshot_count: 0
    id: 12f0d1988b66
    block_name_prefix: rbd_data.12f0d1988b66
    format: 2
    features: layering, exclusive-lock, object-map, fast-diff, deep-flatten
    op_features: 
    flags: 
    create_timestamp: Fri Mar 19 12:12:02 2021
    access_timestamp: Fri Mar 19 12:12:02 2021
    modify_timestamp: Fri Mar 19 12:12:02 2021

edit 진행

root@node1:~# kubectl edit pvc test-rbd 
persistentvolumeclaim/test-rbd edited

...
  resources:
    requests:
      storage: 10Gi

확인

root@node1:~# kubectl get pvc
NAME       STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
test-rbd   Bound    pvc-6cad4f5e-0868-41e3-aac7-e86c7d887b73   10Gi       RWO            csi-rbd-sc     6m45s

root@yjwang0-ceph-01:~# rbd info kubernetes/csi-vol-dfb3b58c-8860-11eb-8f13-fedf14d6325e
rbd image 'csi-vol-dfb3b58c-8860-11eb-8f13-fedf14d6325e':
    size 10 GiB in 2560 objects
    order 22 (4 MiB objects)
    snapshot_count: 0
    id: 12f0d1988b66
    block_name_prefix: rbd_data.12f0d1988b66
    format: 2
    features: layering, exclusive-lock, object-map, fast-diff, deep-flatten
    op_features: 
    flags: 
    create_timestamp: Fri Mar 19 12:12:02 2021
    access_timestamp: Fri Mar 19 12:12:02 2021
    modify_timestamp: Fri Mar 19 12:12:02 2021

Log 확인
ceph-csi 내부에서 externel-resizer가 동작하고 이로인해 resize됨을 확인할 수 있다.

root@node1:~# kubectl describe pvc test-rbd

...
  Normal   Resizing                37s (x2 over 6m44s)  external-resizer rbd.csi.ceph.com                                                                 External resizer is resizing volume pvc-6cad4f5e-0868-41e3-aac7-e86c7d887b73
  Normal   VolumeResizeSuccessful  36s (x2 over 6m43s)  external-resizer rbd.csi.ceph.com                                                                 Resize volume succeeded

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[Kubernetes] Kubernetes 1.20.4 + Ceph rbd (Octopus) 생성 / resize (Expand) 본문

[Kubernetes] Kubernetes 1.20.4 + Ceph rbd (Octopus) 생성 / resize (Expand)

Prerequisite

Ceph RBD Provisioner 사용

Expand pvc

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