268 lines
7.5 KiB
Markdown
268 lines
7.5 KiB
Markdown
# Rook
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[Rook](https://github.com/rook/rook)是一款云原生环境下的开源分布式存储编排系统，目前已进入CNCF孵化。Rook的官方网站是<https://rook.io>。
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## Rook是什么？
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Rook将分布式存储软件转变为自我管理，自我缩放和自我修复的存储服务。它通过自动化部署，引导、配置、供应、扩展、升级、迁移、灾难恢复、监控和资源管理来实现。 Rook使用基础的云原生容器管理、调度和编排平台提供的功能来履行其职责。
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Rook利用扩展点深入融入云原生环境，为调度、生命周期管理、资源管理、安全性、监控和用户体验提供无缝体验。
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Rook现在处于alpha状态，并且最初专注于在Kubernetes之上运行Ceph。Ceph是一个分布式存储系统，提供文件、数据块和对象存储，可以部署在大型生产集群中。Rook计划在未来的版本中增加对除Ceph之外的其他存储系统以及Kubernetes之外的其他云原生环境的支持。
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## 部署
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可以使用helm或直接用yaml文件两种方式来部署rook operator。
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**使用helm部署**
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```bash
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helm init -i jimmysong/kubernetes-helm-tiller:v2.8.1
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helm repo add rook-alpha https://charts.rook.io/alpha
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helm install rook-alpha/rook --name rook --namespace rook-system
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```
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**直接使用yaml文件部署**
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```bash
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kubectl apply -f rook-operator.yaml
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```
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不论使用那种方式部署的rook operator，都会在rook-agent中看到rook-agent用户无法列出集群中某些资源的错误，可以通过为rook-agent的分配`cluster-admin`权限临时解决，详见[Issue 1472](https://github.com/rook/rook/issues/1472)。
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使用如下yanl文件创建一个`ClusterRoleBinding`并应用到集群中。
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```yaml
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kind: ClusterRoleBinding
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apiVersion: rbac.authorization.k8s.io/v1beta1
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metadata:
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name: rookagent-clusterrolebinding
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subjects:
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- kind: ServiceAccount
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name: rook-agent
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namespace: rook-system
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roleRef:
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kind: ClusterRole
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name: cluster-admin
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apiGroup: ""
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```
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**部署rook cluster**
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创建完rook operator后，我们再部署rook cluster。
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`rook-cluster.yaml`配置如下：
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```yaml
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apiVersion: v1
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kind: Namespace
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metadata:
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name: rook
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---
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apiVersion: rook.io/v1alpha1
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kind: Cluster
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metadata:
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name: rook
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namespace: rook
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spec:
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versionTag: v0.6.2
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dataDirHostPath: /var/lib/rook
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storage:
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useAllNodes: true
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useAllDevices: false
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storeConfig:
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storeType: bluestore
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databaseSizeMB: 1024
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journalSizeMB: 1024
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```
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**注意**：需要手动指定`versionTag`，因为该镜像repo中没有`latest`标签，如不指定的话Pod将出现镜像拉取错误。
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执行下面的命令部署rook集群。
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```bash
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kubectl apply -f rook-cluster.yaml
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```
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rook集群运行在`rook` namespace下，查看rook集群中的pod：
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```bash
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$ kubectl -n rook get pod
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NAME READY STATUS RESTARTS AGE
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rook-api-848df956bf-q6zf2 1/1 Running 0 4m
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rook-ceph-mgr0-cfccfd6b8-cpk5p 1/1 Running 0 4m
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rook-ceph-mon0-t496l 1/1 Running 0 6m
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rook-ceph-mon1-zcn7v 1/1 Running 0 5m
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rook-ceph-mon3-h97qx 1/1 Running 0 3m
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rook-ceph-osd-557tn 1/1 Running 0 4m
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rook-ceph-osd-74frb 1/1 Running 0 4m
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rook-ceph-osd-zf7rg 1/1 Running 1 4m
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rook-tools 1/1 Running 0 2m
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```
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**部署StorageClass**
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StorageClass rook-block的yaml文件（rook-storage.yaml）如下：
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```yaml
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apiVersion: rook.io/v1alpha1
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kind: Pool
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metadata:
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name: replicapool
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namespace: rook
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spec:
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replicated:
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size: 1
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# For an erasure-coded pool, comment out the replication size above and uncomment the following settings.
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# Make sure you have enough OSDs to support the replica size or erasure code chunks.
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#erasureCoded:
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# dataChunks: 2
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# codingChunks: 1
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---
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apiVersion: storage.k8s.io/v1
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kind: StorageClass
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metadata:
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name: rook-block
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provisioner: rook.io/block
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parameters:
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pool: replicapool
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# Specify the Rook cluster from which to create volumes.
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# If not specified, it will use `rook` as the name of the cluster.
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# This is also the namespace where the cluster will be
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clusterName: rook
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# Specify the filesystem type of the volume. If not specified, it will use `ext4`.
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# fstype: ext4
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```
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我们在下面的示例中将使用rook-block这个StorageClass来创建PV。
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## 工具
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部署rook操作工具pod，该工具pod的yaml文件（rook-tools.yaml）如下：
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```yaml
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apiVersion: v1
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kind: Pod
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metadata:
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name: rook-tools
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namespace: rook-system
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spec:
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dnsPolicy: ClusterFirstWithHostNet
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serviceAccountName: rook-operator
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containers:
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- name: rook-tools
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image: rook/toolbox:master
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imagePullPolicy: IfNotPresent
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env:
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- name: ROOK_ADMIN_SECRET
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valueFrom:
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secretKeyRef:
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name: rook-ceph-mon
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key: admin-secret
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securityContext:
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privileged: true
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volumeMounts:
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- mountPath: /dev
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name: dev
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- mountPath: /sys/bus
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name: sysbus
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- mountPath: /lib/modules
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name: libmodules
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- name: mon-endpoint-volume
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mountPath: /etc/rook
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hostNetwork: false
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volumes:
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- name: dev
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hostPath:
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path: /dev
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- name: sysbus
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hostPath:
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path: /sys/bus
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- name: libmodules
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hostPath:
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path: /lib/modules
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- name: mon-endpoint-volume
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configMap:
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name: rook-ceph-mon-endpoints
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items:
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- key: endpoint
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path: mon-endpoints
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```
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`ConfigMap`和`Secret`中的配置项内容是自定义的。
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使用下面的命令部署工具pod：
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```bash
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kubectl apply -f rook-tools.yaml
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```
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这是一个独立的pod，没有使用其他高级的controller来管理，我们将它部署在`rook-system`的namespace下。
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```bash
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kubectl -n rook exec -it rook-tools bash
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```
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使用下面的命令查看rook集群状态。
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```bash
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$ rookctl status
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OVERALL STATUS: OK
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USAGE:
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TOTAL USED DATA AVAILABLE
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37.95 GiB 1.50 GiB 0 B 36.45 GiB
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MONITORS:
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NAME ADDRESS IN QUORUM STATUS
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rook-ceph-mon0 10.254.162.99:6790/0 true UNKNOWN
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MGRs:
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NAME STATUS
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rook-ceph-mgr0 Active
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OSDs:
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TOTAL UP IN FULL NEAR FULL
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1 1 1 false false
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PLACEMENT GROUPS (0 total):
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STATE COUNT
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none
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$ ceph df
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GLOBAL:
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SIZE AVAIL RAW USED %RAW USED
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38861M 37323M 1537M 3.96
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POOLS:
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NAME ID USED %USED MAX AVAIL OBJECTS
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```
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## 示例
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官方提供了使用rook作为典型的LAMP（Linux + Apache + MySQL + PHP）应用Wordpress的存储后端的示例的yaml文件`mysql.yaml`和`wordpress.yaml`，使用下面的命令创建。
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```bash
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kubectl apply -f mysql.yaml
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kubectl apply -f wordpress.yaml
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```
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Wordpress要依赖于MySQL，所以要先创建MySQL。
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在创建wordpress的时候可能遇到该错误[rook flexvolume failing to attach volumes #1147](https://github.com/rook/rook/issues/1147)，该问题尚未解决。
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## 清理
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如果使用helm部署，则执行下面的命令：
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```bash
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helm delete --purge rook
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helm delete daemonset rook-agent
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```
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如果使用yaml文件直接部署，则使用`kubectl delete -f `加当初使用的yaml文件即可删除集群。
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## 参考
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- [Operator Helm Chart](https://rook.io/docs/rook/master/helm-operator.html)
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- [Creating Rook Clusters](https://rook.io/docs/rook/v0.6/cluster-crd.html)
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