diff --git a/SUMMARY.md b/SUMMARY.md index 1534ceed0..017e5aeba 100644 --- a/SUMMARY.md +++ b/SUMMARY.md @@ -140,6 +140,7 @@ - [使用Ceph做持久化存储](practice/using-ceph-for-persistent-storage.md) - [OpenEBS](practice/openebs.md) - [使用OpenEBS做持久化存储](practice/using-openebs-for-persistent-storage.md) + - [Rook](practice/rook.md) - [集群与应用监控](practice/monitoring.md) - [Heapster](practice//heapster.md) - [使用Heapster获取集群和对象的metric数据](practice/using-heapster-to-get-object-metrics.md) diff --git a/practice/rook.md b/practice/rook.md new file mode 100644 index 000000000..a75ce0674 --- /dev/null +++ b/practice/rook.md @@ -0,0 +1,267 @@ +# Rook + +[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。 + +## Rook是什么? + +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。 + +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。 + +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。 + +## 部署 + +可以使用helm或直接用yaml文件两种方式来部署rook operator。 + +**使用helm部署** + +```bash +helm init -i jimmysong/kubernetes-helm-tiller:v2.8.1 +helm repo add rook-alpha https://charts.rook.io/alpha +helm install rook-alpha/rook --name rook --namespace rook-system +``` + +**直接使用yaml文件部署** + +```bash +kubectl apply -f rook-operator.yaml +``` + +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)。 + +使用如下yanl文件创建一个`ClusterRoleBinding`并应用到集群中。 + +```yaml +kind: ClusterRoleBinding +apiVersion: rbac.authorization.k8s.io/v1beta1 +metadata: + name: rookagent-clusterrolebinding +subjects: + - kind: ServiceAccount + name: rook-agent + namespace: rook-system +roleRef: + kind: ClusterRole + name: cluster-admin + apiGroup: "" +``` + +**部署rook cluster** + +创建完rook operator后,我们再部署rook cluster。 + +`rook-cluster.yaml`配置如下: + +```yaml +apiVersion: v1 +kind: Namespace +metadata: + name: rook +--- +apiVersion: rook.io/v1alpha1 +kind: Cluster +metadata: + name: rook + namespace: rook +spec: + versionTag: v0.6.2 + dataDirHostPath: /var/lib/rook + storage: + useAllNodes: true + useAllDevices: false + storeConfig: + storeType: bluestore + databaseSizeMB: 1024 + journalSizeMB: 1024 +``` + +**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。 + +执行下面的命令部署rook集群。 + +```bash +kubectl apply -f rook-cluster.yaml +``` + +rook集群运行在`rook` namespace下,查看rook集群中的pod: + +```bash +$ kubectl -n rook get pod +NAME READY STATUS RESTARTS AGE +rook-api-848df956bf-q6zf2 1/1 Running 0 4m +rook-ceph-mgr0-cfccfd6b8-cpk5p 1/1 Running 0 4m +rook-ceph-mon0-t496l 1/1 Running 0 6m +rook-ceph-mon1-zcn7v 1/1 Running 0 5m +rook-ceph-mon3-h97qx 1/1 Running 0 3m +rook-ceph-osd-557tn 1/1 Running 0 4m +rook-ceph-osd-74frb 1/1 Running 0 4m +rook-ceph-osd-zf7rg 1/1 Running 1 4m +rook-tools 1/1 Running 0 2m +``` + +**部署StorageClass** + +StorageClass rook-block的yaml文件(rook-storage.yaml)如下: + +```yaml +apiVersion: rook.io/v1alpha1 +kind: Pool +metadata: + name: replicapool + namespace: rook +spec: + replicated: + size: 1 + # For an erasure-coded pool, comment out the replication size above and uncomment the following settings. + # Make sure you have enough OSDs to support the replica size or erasure code chunks. + #erasureCoded: + # dataChunks: 2 + # codingChunks: 1 +--- +apiVersion: storage.k8s.io/v1 +kind: StorageClass +metadata: + name: rook-block +provisioner: rook.io/block +parameters: + pool: replicapool + # Specify the Rook cluster from which to create volumes. + # If not specified, it will use `rook` as the name of the cluster. + # This is also the namespace where the cluster will be + clusterName: rook + # Specify the filesystem type of the volume. If not specified, it will use `ext4`. + # fstype: ext4 +``` + +我们在下面的示例中将使用rook-block这个StorageClass来创建PV。 + +## 工具 + +部署rook操作工具pod,该工具pod的yaml文件(rook-tools.yaml)如下: + +```yaml +apiVersion: v1 +kind: Pod +metadata: + name: rook-tools + namespace: rook-system +spec: + dnsPolicy: ClusterFirstWithHostNet + serviceAccountName: rook-operator + containers: + - name: rook-tools + image: rook/toolbox:master + imagePullPolicy: IfNotPresent + env: + - name: ROOK_ADMIN_SECRET + valueFrom: + secretKeyRef: + name: rook-ceph-mon + key: admin-secret + securityContext: + privileged: true + volumeMounts: + - mountPath: /dev + name: dev + - mountPath: /sys/bus + name: sysbus + - mountPath: /lib/modules + name: libmodules + - name: mon-endpoint-volume + mountPath: /etc/rook + hostNetwork: false + volumes: + - name: dev + hostPath: + path: /dev + - name: sysbus + hostPath: + path: /sys/bus + - name: libmodules + hostPath: + path: /lib/modules + - name: mon-endpoint-volume + configMap: + name: rook-ceph-mon-endpoints + items: + - key: endpoint + path: mon-endpoints +``` + +`ConfigMap`和`Secret`中的配置项内容是自定义的。 + +使用下面的命令部署工具pod: + +```bash +kubectl apply -f rook-tools.yaml +``` + +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。 + +```bash +kubectl -n rook exec -it rook-tools bash +``` + +使用下面的命令查看rook集群状态。 + +```bash +$ rookctl status +OVERALL STATUS: OK + +USAGE: +TOTAL USED DATA AVAILABLE +37.95 GiB 1.50 GiB 0 B 36.45 GiB + +MONITORS: +NAME ADDRESS IN QUORUM STATUS +rook-ceph-mon0 10.254.162.99:6790/0 true UNKNOWN + +MGRs: +NAME STATUS +rook-ceph-mgr0 Active + +OSDs: +TOTAL UP IN FULL NEAR FULL +1 1 1 false false + +PLACEMENT GROUPS (0 total): +STATE COUNT +none + +$ ceph df +GLOBAL: + SIZE AVAIL RAW USED %RAW USED + 38861M 37323M 1537M 3.96 +POOLS: + NAME ID USED %USED MAX AVAIL OBJECTS +``` + +## 示例 + +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。 + +```bash +kubectl apply -f mysql.yaml +kubectl apply -f wordpress.yaml +``` + +Wordpress要依赖于MySQL,所以要先创建MySQL。 + +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。 + +## 清理 + +如果使用helm部署,则执行下面的命令: + +```bash +helm delete --purge rook +helm delete daemonset rook-agent +``` + +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。 + +## 参考 + +- [Operator Helm Chart](https://rook.io/docs/rook/master/helm-operator.html) +- [Creating Rook Clusters](https://rook.io/docs/rook/v0.6/cluster-crd.html) \ No newline at end of file