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K8S实践Ⅺ（Rook）
一、Rook部署
- Rook是一个开源的cloud-native storage orchestrator，为各种存储解决方案提供平台、框架和支持，以便与云原生环境本地集成。Rook通过自动化部署、引导、配置、置备、扩展、升级、迁移、灾难恢复、监控和资源管理来实现此目的。Rook使用底层云本机容器管理、调度和编排平台提供的工具来实现它自身的功能。
1.使用Helm安装Rook Operator
Ceph Operator Helm Chart
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# helm repo add rook-release https://charts.rook.io/release
# helm install --namespace rook-ceph rook-release/rook-ceph --name rook-ceph2.在k8s集群中三个Node节点上新增一块磁盘sdb
[root@k8s-node01 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 200G 0 disk
sdb 8:16 0 50G 0 disk 3.创建Rook Cluster
# git clone https://github.com/rook/rook.git
# cd rook/cluster/examples/kubernetes/ceph/
# kubectl apply -f cluster.yaml如果要删除已创建的Ceph集群，需要删除/var/lib/rook/目录下的文件
4.部署Ceph dashboard
在cluster.yaml文件中默认已经启用了ceph dashboard，但是默认服务类型为 ClusterIP 类型，只能集群内部访问，如果外部访问的话，就需要使用 NodePort 服务暴漏方式。
# kubectl get svc -n rook-ceph |grep mgr-dashboard
rook-ceph-mgr-dashboard ClusterIP 10.106.163.135 8443/TCP 6h4m
# kubectl apply -f dashboard-external-https.yaml# kubectl get svc -n rook-ceph |grep mgr-dashboard
rook-ceph-mgr-dashboard ClusterIP 10.106.163.135 8443/TCP 6h4m
rook-ceph-mgr-dashboard-external-https NodePort 10.98.230.103 8443:31656/TCP 23h
5.登录Ceph dashboard
# kubectl cluster-info |grep master
Kubernetes master is running at https://20.0.20.200:6443
获取登录密码
# kubectl get pod -n rook-ceph | grep mgr
rook-ceph-mgr-a-6b9cf7f6f6-fdhz5 1/1 Running 0 6h21m
# kubectl -n rook-ceph logs rook-ceph-mgr-a-6b9cf7f6f6-fdhz5 | grep password
debug 2019-09-20 01:09:34.166 7f51ba8d2700 0 log_channel(audit) log [DBG] : from='client.24290 -' entity='client.admin' cmd=[{"username": "admin", "prefix": "dashboard set-login-credentials", "password": "5PGcUfGey2", "target": ["mgr", ""], "format": "json"}]: dispatch
6.部署Ceph toolbox
默认启动的Ceph集群，是开启Ceph认证的，这样你登陆Ceph组件所在的Pod里，是没法去获取集群状态，以及执行CLI命令，这时需要部署Ceph toolbox
# kubectl apply -f toolbox.yaml
deployment.apps/rook-ceph-tools created
# kubectl -n rook-ceph get pods -o wide | grep ceph-tools
rook-ceph-tools-7cf4cc7568-m6wbb 1/1 Running 0 84s 20.0.20.206 k8s-node03
# kubectl -n rook-ceph exec -it rook-ceph-tools-7cf4cc7568-m6wbb bash
[root@k8s-node03 /]# ceph status
cluster:
id: aa31c434-13cd-4858-9535-3eb6fa1a441c
health: HEALTH_OK
services:
mon: 3 daemons, quorum a,b,c (age 6h)
mgr: a(active, since 6h)
osd: 3 osds: 3 up (since 6h), 3 in (since 6h)
data:
pools: 0 pools, 0 pgs
objects: 0 objects, 0 B
usage: 3.0 GiB used, 144 GiB / 147 GiB avail
pgs:
[root@k8s-node03 /]# ceph df
RAW STORAGE:
CLASS SIZE AVAIL USED RAW USED %RAW USED
hdd 147 GiB 144 GiB 4.7 MiB 3.0 GiB 2.04
TOTAL 147 GiB 144 GiB 4.7 MiB 3.0 GiB 2.04
POOLS:
POOL ID STORED OBJECTS USED %USED MAX AVAIL
7.创建Pool和StorageClass
# kubectl apply -f flex/storageclass.yaml
cephblockpool.ceph.rook.io/replicapool created
storageclass.storage.k8s.io/rook-ceph-block created# kubectl get storageclass
NAME PROVISIONER AGE
rook-ceph-block ceph.rook.io/block 50s
8.创建一个PVC
# cat cephfs-pvc.yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: cephfs-pvc
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 10Gi
storageClassName: rook-ceph-block
# kubectl apply -f cephfs-pvc.yaml
persistentvolumeclaim/cephfs-pvc created# kubectl get pvc
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
cephfs-pvc Bound pvc-cc158fa0-30f9-420b-96c8-b03b474eb9f7 10Gi RWO rook-ceph-block 4s
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