K8S集群实践之九: Ceph

Rook is an open source cloud-native storage orchestrator, providing the platform, framework, and support for Ceph storage to natively integrate with cloud-native environments.1. 说明

因香橙派和树莓派资源所限，转移到基于VirtualBox建立的VMs继续实践。

虚拟机环境列表:

2. 准备工作

• 下载 ubuntu-22.04.2-live-server-amd64.iso，并映射到启动光盘
• 虚拟机设置双网卡，1作桥接(同网访问)，1作NAT网络（K8s内网）
• 安装时选择镜像（重要）https://mirrors.aliyun.com/ubuntu
• 初始化K8s环境
• 为避免CTR拉取镜像失败，设置容器代理，编辑 /lib/systemd/system/containerd.service

  [Service]
  Environment="HTTP_PROXY=http://192.168.0.108:1081"
  Environment="HTTPS_PROXY=http://192.168.0.108:1081"
  Environment="NO_PROXY=aliyun.com,aliyuncs.com,huaweicloud.com,k8s-master-0,k8s-master-1,k8s-worker-0,localhost,127.0.0.1,10.0.0.0/8,172.16.0.0/12,192.168.0.0/16"
  

  systemctl daemon-reload && systemctl restart containerd
  

3. 方案及安装步骤

3.1 Rook

Rook is an open source cloud-native storage orchestrator, providing the platform, framework, and support for Ceph storage to natively integrate with cloud-native environments.

3.2 安装要求

• Raw devices (no partitions or formatted filesystems)
• Raw partitions (no formatted filesystem) 
• LVM Logical Volumes (no formatted filesystem)
• Persistent Volumes available from a storage class in block mode

一句话：有个裸盘 （100G /dev/sdb）

保证至少3个节点，去掉污点

kubectl taint nodes --all node-role.kubernetes.io/control-plane-

3.3 安装步骤

1. 获取rook仓库到安装路径，如：/k8s_apps/rook

git clone --single-branch --branch v1.12.6 https://github.com/rook/rook.git

2. 编写安装脚本，/k8s_apps/scripts/k8s-rook-ceph.sh

#!/bin/bash
 
kubectl apply -f /k8s_apps/rook/deploy/examples/crds.yaml
kubectl apply -f /k8s_apps/rook/deploy/examples/common.yaml
kubectl apply -f /k8s_apps/rook/deploy/examples/operator.yaml
 
kubectl -n rook-ceph get pod
 
kubectl apply -f /k8s_apps/rook/deploy/examples/cluster.yaml
 
kubectl apply -f /k8s_apps/rook/deploy/examples/toolbox.yaml
kubectl apply -f /k8s_apps/rook/deploy/examples/dashboard-ingress-https.yaml
 
kubectl -n rook-ceph get secret rook-ceph-dashboard-password -o jsonpath="{['data']['password']}" | base64 --decode && echo
 
# 应用各种存储
kubectl apply -f /k8s_apps/rook/deploy/examples/filesystem.yaml
kubectl apply -f /k8s_apps/rook/deploy/examples/nfs.yaml
kubectl apply -f /k8s_apps/rook/deploy/examples/object.yaml
 
# 声明存储类
kubectl apply -f /k8s_apps/rook/deploy/examples/csi/rbd/storageclass.yaml
 
# 上一个使用例子
kubectl apply -f /k8s_apps/rook/deploy/examples/mysql.yaml
kubectl apply -f /k8s_apps/rook/deploy/examples/wordpress.yaml
 
 
 
 

3. 编写删除脚本，/k8s_apps/scripts/rook-ceph-delete.sh

#!/bin/bash
 
kubectl delete -f /k8s_apps/rook/deploy/examples/wordpress.yaml
kubectl delete -f /k8s_apps/rook/deploy/examples/mysql.yaml
kubectl delete -n rook-ceph cephblockpool replicapool
kubectl delete storageclass rook-ceph-block
kubectl delete -f /k8s_apps/rook/deploy/examples/csi/cephfs/kube-registry.yaml
kubectl delete storageclass csi-cephfs
 
kubectl -n rook-ceph patch cephcluster rook-ceph --type merge -p '{"spec":{"cleanupPolicy":{"confirmation":"yes-really-destroy-data"}}}'
 
kubectl -n rook-ceph delete cephcluster rook-ceph
 
kubectl -n rook-ceph get cephcluster
 
 
kubectl delete -f /k8s_apps/rook/deploy/examples/operator.yaml
kubectl delete -f /k8s_apps/rook/deploy/examples/common.yaml
kubectl delete -f /k8s_apps/rook/deploy/examples/crds.yaml
kubectl delete -f /k8s_apps/rook/deploy/examples/toolbox.yaml
kubectl delete -f /k8s_apps/rook/deploy/examples/dashboard-ingress-https.yaml
kubectl delete -f /k8s_apps/rook/deploy/examples/csi/rbd/storageclass.yaml
 
kubectl delete -f /k8s_apps/rook/deploy/examples/mysql.yaml
kubectl delete -f /k8s_apps/rook/deploy/examples/wordpress.yaml
 
 

4. 执行安装，一切正常的话，如下图，不正常的话，执行删除脚本，排除问题后重来。

进入工具pod检查应用状态 

kubectl -n rook-ceph exec -it deploy/rook-ceph-tools -- bash
 
bash-4.4$ ceph -s
  cluster:
    id:     1f97e89d-faba-405a-a200-4eaeb9c11035
    health: HEALTH_WARN
            clock skew detected on mon.c
 
  services:
    mon: 3 daemons, quorum a,b,c (age 17h)
    mgr: b(active, since 17h), standbys: a
    osd: 3 osds: 3 up (since 17h), 3 in (since 2d)
 
  data:
    pools:   1 pools, 1 pgs
    objects: 2 objects, 449 KiB
    usage:   64 MiB used, 300 GiB / 300 GiB avail
    pgs:     1 active+clean

4. 相关命令

- 实时查看pod创建进度
kubectl get pod -n rook-ceph -w
 
- 实时查看集群创建进度
kubectl get cephcluster -n rook-ceph rook-ceph -w
 
- 详细描述
kubectl describe cephcluster -n rook-ceph rook-ceph
 
# 进入ceph部署应用
kubectl -n rook-ceph exec -it deploy/rook-ceph-tools -- bash
 
 
# ceph 相关
ceph status
ceph osd status
ceph df 
rados df

5. 参考

​- ​https://rook.io/docs/rook/v1.8/ceph-block.html​​​​​

- Rook - Rook Ceph Documentation