K8S使用开源CEPH作为后端StorageClass
1 引言
K8S在1.13版本开始支持使用Ceph作为StorageClass。其中云原生存储Rook和开源Ceph应用都非常广泛。本文主要介绍K8S如何对接开源Ceph使用RBD卷。
K8S对接Ceph的技术栈如下图所示。K8S主要通过容器存储接口CSI和Ceph进行交互。
https://docs.ceph.com/en/reef/rbd/rbd-kubernetes/
CSI的官方地址如下
https://github.com/ceph/ceph-csi/tree/release-v3.9
在部署CSI前需要确认好部署的CSI版本,在CSI的官网,我们可以看到CSI版本与K8S之间的对应关系。
CSI与Ceph之间的对应关系参考以下链接
https://github.com/ceph/ceph-csi#support-matrix
作者环境的K8S版本为1.24,Ceph版本为14,因此使用3.5.1版本的CSI。下面开始部署。
2 Ceph侧资源创建
[
pool 'k8s' created
[
[
key = AQBClIVj8usBLxAAxTl0DwZCz9prNRRRI9Bl5A==
[
id: 395b7a30-eb33-460d-8e38-524fc48c58cb
[
e3: 3 mons at {
ceph-1=[v2:10.0.245.192:3300/0,v1:10.0.245.192:6789/0],
ceph-2=[v2:10.0.138.175:3300/0,v1:10.0.138.175:6789/0],
ceph-3=[v2:10.0.28.226:3300/0,v1:10.0.28.226:6789/0]},
election epoch 1112, leader 0 ceph-1, quorum 0,1,2 ceph-1,ceph-2,ceph-3
3 ceph-csi部署环境准备
主要步骤为下载官方csi部署文件,创建csi需要使用到的configmap及sa、secret。使用到的文件均位于ceph-csi/deploy/rbd/kubernetes/ 目录下,同时会新建以下三个文件用于保存ceph相关配置
-
csi-kms-config-map.yaml
-
ceph-config-map.yaml
-
csi-rbd-secret.yaml
[root@k8s-master02 ~]# wget https://github.com/ceph/ceph-csi/archive/refs/tags/v3.5.1.tar.gz ##本次实验ceph版本为14,使用3.5.1版本有较好的兼容性
[root@k8s-master02 ~]# tar xvf v3.5.1.tar.gz
[root@k8s-master02 ~]# mv ceph-csi-3.5.1 ceph-csi
[root@k8s-master02 ~]# cd /root/ceph-csi/deploy/rbd/kubernetes/
[root@k8s-master02 kubernetes]# cat csi-config-map.yaml ##编辑config-map文件
#
# /!\ DO NOT MODIFY THIS FILE
#
# This file has been automatically generated by Ceph-CSI yamlgen.
# The source for the contents can be found in the api/deploy directory, make
# your modifications there.
#
---
apiVersion: v1
kind: ConfigMap
metadata:
name: "ceph-csi-config"
data:
config.json: |-
[
{
"clusterID": "395b7a30-eb33-460d-8e38-524fc48c58cb", #ceph -s输出的id
"monitors": [
"10.0.245.192:6789", ##三个mon服务的ip地址
"10.0.138.175:6789",
"10.0.28.226:6789"
]
}
]
[root@k8s-master02 kubernetes]# kubectl create ns ceph-csi ##创建namespace
namespace/ceph-csi created
[root@k8s-master02 kubernetes]# kubectl -n ceph-csi create -f csi-config-map.yaml
configmap/ceph-csi-config created
[root@k8s-master02 kubernetes]# cat csi-kms-config-map.yaml ##新建kms-config文件
---
apiVersion: v1
kind: ConfigMap
data:
config.json: |-
{}
metadata:
name: ceph-csi-encryption-kms-config
[root@k8s-master02 kubernetes]# kubectl create -n ceph-csi -f csi-kms-config-map.yaml
configmap/ceph-csi-encryption-kms-config created
[root@k8s-master02 kubernetes]# cat ceph-config-map.yaml ##新建一个ceph-config文件,ceph.conf中的内容与ceph集群中/etc/ceph/ceph.conf的内容保持一致
---
apiVersion: v1
kind: ConfigMap
data:
ceph.conf: |
[global]
fsid = 395b7a30-eb33-460d-8e38-524fc48c58cb
public_network = 10.0.0.0/16
cluster_network = 10.0.0.0/16
mon_initial_members = ceph-1
mon_host = 10.0.245.192
auth_cluster_required = cephx
auth_service_required = cephx
auth_client_required = cephx
mon_allow_pool_delete = true
auth_allow_insecure_global_id_reclaim = false
rbd_default_format = 2
# keyring is a required key and its value should be empty
keyring: |
metadata:
name: ceph-config
[root@k8s-master02 kubernetes]# kubectl -n ceph-csi create -f ceph-config-map.yaml
configmap/ceph-config created
[root@k8s-master02 kubernetes]# cat csi-rbd-secret.yaml ##新建一个secret文件
apiVersion: v1
kind: Secret
metadata:
name: csi-rbd-secret
namespace: ceph-csi
stringData:
userID: k8s ##ceph集群上创建额用户
userKey: AQBClIVj8usBLxAAxTl0DwZCz9prNRRRI9Bl5A== ##用户的key
[root@k8s-master02 kubernetes]# kubectl create -f csi-rbd-secret.yaml
secret/csi-rbd-secret created
[root@k8s-master02 ~]# sed -i "s/namespace: default/namespace: ceph-csi/g" $(grep -rl "namespace: default" ./) #将所有yaml文件的namespace从default改成ceph-csi
[root@k8s-master02 kubernetes]# cat csi-provisioner-rbac.yaml ##检查配置文件中namespace是否更改成功
---
apiVersion: v1
kind: ServiceAccount
metadata:
name: rbd-csi-provisioner
# replace with non-default namespace name
namespace: ceph-csi
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: rbd-external-provisioner-runner
##创建rbac权限
[root@k8s-master02 kubernetes]# kubectl create -f 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@k8s-master02 kubernetes]# kubectl create -f 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
4 部署ceph-csi相关容器
yaml中的镜像源需要替换,否则部署时镜像可能下载不成功。如果部署其他版本的csi,可以自己设置通过阿里云容器镜像服务托管下载k8s.gcr.io中相关csi版本的镜像。
[
[
service/csi-rbdplugin-provisioner created
deployment.apps/csi-rbdplugin-provisioner created
[
daemonset.apps/csi-rbdplugin created
service/csi-metrics-rbdplugin created
[
NAME READY STATUS RESTARTS AGE
csi-rbdplugin-8s6cf 3/3 Running 0 60m
csi-rbdplugin-g74qd 3/3 Running 0 60m
csi-rbdplugin-provisioner-56d6d755c7-jhcwl 7/7 Running 0 14m
csi-rbdplugin-provisioner-56d6d755c7-lz2zf 7/7 Running 0 14m
csi-rbdplugin-provisioner-56d6d755c7-pxw7q 7/7 Running 0 14m
csi-rbdplugin-twjdh 3/3 Running 0 60m
csi-rbdplugin-v529x 3/3 Running 0 60m
csi-rbdplugin-wgh5c 3/3 Running 0 60m
5 创建StorageClass
---
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
name: csi-rbd-sc
provisioner: rbd.csi.ceph.com
parameters:
pool: k8s ##ceph集群的pool名
reclaimPolicy: Delete
allowVolumeExpansion: true
mountOptions:
6 创建PV
[
[
persistentvolumeclaim/rbd-pvc created
本文主要介绍K8S对接Ceph使用RBD块的方法,对象存储或文件存储可以参考官方文档进行对接。