【kubernetes/k8s概念】 rook design分析

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# 1. Ceph Cluster CRD #

apiVersion: ceph.rook.io/v1
    kind: CephCluster
    metadata:
      name: rook-ceph
      namespace: rook-ceph
    spec:
      cephVersion:
        # see the "Cluster Settings" section below for more details on which image of ceph to run
        image: ceph/ceph:v14.2.1-20190430
      dataDirHostPath: /var/lib/rook
      mon:
        count: 3
        allowMultiplePerNode: true
      storage:
        useAllNodes: true
        useAllDevices: true

**    1.1 cephVersion: 版本信息**

image

allowUnsupported：生产环境建议false

**    1.2 dataDirHostPath: hostPath方式的挂载路径，一般为/var/lib/rook**

如果创建新cluster，先前数据必须清除，否则mon启动失败

**    1.3 mon：**

**          **count：启动mon pod的个数 1 <= count <= 9，默认为3，

preferredCount：主要是扩容Mon个数使用的

allowMultiplePerNode：是否允许一个node上跑多个mon，默认为false

**    1.4 dashboard：集群dashboard，可以查看集群状态**

**    1.5 resources：pod资源请求与限制，cpu与mem**

**    1.6 **storage：存储配置信息

useAllNodes： `true` / `false，是否所有的节点都用来做存储，如果指定节点存储设置为false，生产环境建议设置false`

`         `nodes：配置单个存储节点，需要useAllNodes设置为false

name： kubernetes匹配kubernetes.io/hostname

**    1.7 useAllDevices：不建议使用true，如果deviceFilter设置，将会被覆盖掉**

**    1.8 deviceFilter：正则表达，如果一个节点指定使用device，则该选项被忽略**

**    1.9 devices：**

**    1.10 **config：

metadataDevice：可以选择使用设备存储metadata，比如SSD

storeType：`filestore` / `bluestore（default），`

`           `databaseSizeMB：bluestore database

walSizeMB：bluestore write ahead log (WAL)

journalSizeMB：filestore journal.

osdsPerDevice：

encryptedDevice：

### 示例： ###

apiVersion: ceph.rook.io/v1
    kind: CephCluster
    metadata:
      name: rook-ceph
      namespace: rook-ceph
    spec:
      cephVersion:
        image: ceph/ceph:v14.2.1-20190430
      dataDirHostPath: /var/lib/rook
      mon:
        count: 3
        allowMultiplePerNode: true
      dashboard:
        enabled: true
      # cluster level storage configuration and selection
      storage:
        useAllNodes: false
        useAllDevices: false
        deviceFilter:
        location:
        config:
          metadataDevice:
          databaseSizeMB: "1024" # this value can be removed for environments with normal sized disks (100 GB or larger)
          journalSizeMB: "1024"  # this value can be removed for environments with normal sized disks (20 GB or larger)
        nodes:
        - name: "172.17.4.101"
          directories:         # specific directories to use for storage can be specified for each node
          - path: "/rook/storage-dir"
        - name: "172.17.4.201"
          devices:             # specific devices to use for storage can be specified for each node
          - name: "sdb"
          - name: "sdc"
          config:         # configuration can be specified at the node level which overrides the cluster level config
            storeType: bluestore
        - name: "172.17.4.301"
          deviceFilter: "^sd."

# 2. Ceph Block Pool CRD #

>    Rook allows creation and customization of storage pools through the custom resource definitions (CRDs). The following settings are available for pools.

**Replicated: 数据副本数量，至少需要的osd数量，如果设置**erasureCoded就不能设置

erasureCoded：

*  `dataChunks`: Number of chunks to divide the original object into
 *  `codingChunks`: Number of redundant chunks to store

failureDomain：

>     apiVersion: ceph.rook.io/v1
>     kind: CephBlockPool
>     metadata:
>       name: replicapool
>       namespace: rook-ceph
>     spec:
>       failureDomain: host
>       replicated:
>         size: 3
>       deviceClass: hdd

## ##

### 参考： ###

[https://github.com/rook/rook/blob/master/Documentation/ceph-cluster-crd.md][https_github.com_rook_rook_blob_master_Documentation_ceph-cluster-crd.md]

[https://github.com/rook/rook/blob/master/Documentation/ceph-pool-crd.md][https_github.com_rook_rook_blob_master_Documentation_ceph-pool-crd.md]

[https_github.com_rook_rook_blob_master_Documentation_ceph-cluster-crd.md]: https://github.com/rook/rook/blob/master/Documentation/ceph-cluster-crd.md
[https_github.com_rook_rook_blob_master_Documentation_ceph-pool-crd.md]: https://github.com/rook/rook/blob/master/Documentation/ceph-pool-crd.md