RBD存储卷

目前 CaaSP4 支持多种 Volume 类型，这里选择 Ceph RBD（Rados Block Device)，主要有如下好处：

Ceph 经过多年开发，已经非常熟，社区也很活跃；
Ceph 同时支持对象存储，块存储和文件系统接口；

环境准备条件

1、搭建环境

操作系统版本： SLES15 SP1，无需安装 swap
内核版本：4.12.14-197.18-default
Kubernetes 版本：CaaSP 4 , v1.15.2
Ceph ：Storage 6
VMware Workstation 14

2、虚拟化环境搭建和系统安装参考：

SUSE Storage6 环境搭建详细步骤 - Win10 + VMware WorkStation
SUSE Linux Enterprise 15 SP1 系统安装
SUSE Ceph 快速部署 - Storage6
SUSE CaaS Platform 4 - 安装部署

3、实验目的

配置 Pod 资源使用 RBD 存储卷

图1 环境架构

1、所有节点安装

# zypper -n in ceph-common

复制 ceph.conf 到 worker 节点上

# scp admin:/etc/ceph/ceph.conf /etc/ceph/

2、创建池 caasp4

# ceph osd pool create caasp4 128

3、创建 key ，并存储到 /etc/ceph/ 目录中

# ceph auth get-or-create client.caasp4 mon 'allow r' \
    osd 'allow rwx pool=caasp4' -o /etc/ceph/caasp4.keyring

4、创建 RBD 镜像，2G

# rbd create caasp4/ceph-image-test -s 2048

5、查看 ceph 集群 key 信息，并生成基于 base64 编码的key

# ceph auth list
.......
client.admin
        key: AQA9w4VdAAAAABAAHZr5bVwkALYo6aLVryt7YA==
        caps: [mds] allow *
        caps: [mgr] allow *
        caps: [mon] allow *
        caps: [osd] allow *
.......
client.caasp4
        key: AQD1VJddM6QIJBAAlDbIWRT/eiGhG+aD8SB+5A==
        caps: [mon] allow r
        caps: [osd] allow rwx pool=caasp4

对 key 进行 base64 编码

# echo AQD1VJddM6QIJBAAlDbIWRT/eiGhG+aD8SB+5A== | base64
QVFEMVZKZGRNNlFJSkJBQWxEYklXUlQvZWlHaEcrYUQ4U0IrNUE9PQo=

6、Master 节点上，创建 secret 资源，插入 base64 key

# vi ceph-secret-test.yaml
apiVersion: v1
kind: Secret
metadata:
  name: ceph-secret-test
data:
  key: QVFEMVZKZGRNNlFJSkJBQWxEYklXUlQvZWlHaEcrYUQ4U0IrNUE9PQo=

# kubectl create -f ceph-secret-test.yaml
secret/ceph-secret-test created

# kubectl get secrets ceph-secret-test
NAME               TYPE     DATA   AGE
ceph-secret-test   Opaque   1      14s

7、创建 Pod，并使用存储卷

# mkdir /root/ceph_rbd_pod
# vim /root/ceph_rbd_pod/ceph-rbd-pod.yaml
apiVersion: v1
kind: Pod
metadata:
  name: vol-rbd-pod
spec:
  containers:
  - name: ceph-busybox
    image: busybox
    command: ["sleep", "60000"]
    volumeMounts:
    - name: ceph-vol-test
      mountPath: /usr/share/busybox
      readOnly: false
  volumes:
  - name: ceph-vol-test
    rbd:
      monitors:
        - 192.168.2.40:6789
        - 192.168.2.41:6789
        - 192.168.2.42:6789
      pool: caasp4
      image: ceph-image-test
      user: caasp4
      secretRef:
        name: ceph-secret-test
      fsType: ext4
      readOnly: false

8、查看 Pod 状态和挂载

# kubectl get pods
NAME          READY   STATUS    RESTARTS   AGE
vol-rbd-pod   1/1     Running   0          22s

# kubectl get pods -o wide
NAME          READY   STATUS    RESTARTS   AGE   IP            NODE       NOMINATED NODE   READINESS GATES
vol-rbd-pod   1/1     Running   0          27s   10.244.2.59   worker02   <none>           <none>

# kubectl describe pods vol-rbd-pod
Containers:
  ceph-busybox:
 .....
    Mounts:                               # 挂载
      /usr/share/busybox from ceph-vol-test (rw)
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-4hslq (ro)
 .....
Volumes:
  ceph-vol-test:
    Type:          RBD (a Rados Block Device mount on the host that shares a pod's lifetime)
    CephMonitors:  [192.168.2.40:6789 192.168.2.41:6789 192.168.2.42:6789]
    RBDImage:      ceph-image-test        # RBD 镜像名
    FSType:        ext4                   # 文件格式
    RBDPool:       caasp4                 # 池
    RadosUser:     caasp4                 # 用户
    Keyring:       /etc/ceph/keyring
    SecretRef:     &LocalObjectReference{Name:ceph-secret-test,}
    ReadOnly:      false
  default-token-4hslq:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  default-token-4hslq
    Optional:    false
  .....

9、worker02节点上查看映射

worker02:~ # rbd showmapped
id pool   namespace image           snap device
0  caasp4           ceph-image-test -    /dev/rbd0

存储

SUSE CaaS Platform 4 - Ceph RBD 作为 Pod 存储卷

RBD存储卷

环境准备条件