文章目录
前言
x86架构上，k8s设置openebs的hostpath作为默认存储类的部署记录
甲方的一个环境，需要将k8s集群缩容由3节点缩小为1节点，因为之前使用的存储方案是rook-ceph，需要找一个替换方案。我就想到了openebs。这里记录一下相关的操作
一、openebs是什么？
OpenEBS turns any storage available to Kubernetes worker nodes into Local or Distributed Kubernetes Persistent Volumes.
官网地址： https://openebs.io/docs/3.3.x/user-guides/installation
Hostpath地址：https://openebs.io/docs/3.3.x/user-guides/localpv-hostpath
二、准备步骤
1.下载yaml文件
shell
mkdir -p /data/openebs/
cd /data/openebs/
wget https://openebs.github.io/charts/openebs-operator.yaml
wget https://openebs.github.io/charts/examples/local-hostpath/local-hostpath-pod.yaml
wget https://openebs.github.io/charts/examples/local-hostpath/local-hostpath-pvc.yaml2.准备一个新的单点k8s用于测试
shell
kubectl get pod -A
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system calico-kube-controllers-676c86494f-jwfv5 1/1 Running 0 38m
kube-system calico-node-v5vnq 1/1 Running 0 38m
kube-system coredns-757cd945b-5767j 1/1 Running 0 38m
kube-system coredns-757cd945b-k6rvk 1/1 Running 0 38m
kube-system kube-apiserver-clamav 1/1 Running 0 38m
kube-system kube-controller-manager-clamav 1/1 Running 0 38m
kube-system kube-proxy-d8fq6 1/1 Running 0 38m
kube-system kube-scheduler-clamav 1/1 Running 0 38m
kube-system nodelocaldns-5wmhs 1/1 Running 0 38m
kubernetes-dashboard dashboard-metrics-scraper-9966c679-d877s 1/1 Running 0 36m
kubernetes-dashboard kubernetes-dashboard-574df6df5f-2r89r 1/1 Running 0 36m2.将openebs-operator.yaml中的镜像修改成使用国内加速源的
我用的是dockerpull.cn的国内源,一共涉及到下列5个镜像
shell
openebs/node-disk-manager:2.1.0
openebs/node-disk-operator:2.1.0
openebs/node-disk-exporter:2.1.0
openebs/provisioner-localpv:3.4.0
openebs/linux-utils:3.5.0pull 镜像
shell
docker pull dockerpull.cn/openebs/node-disk-manager:2.1.0
docker pull dockerpull.cn/openebs/node-disk-operator:2.1.0
docker pull dockerpull.cn/openebs/node-disk-exporter:2.1.0
docker pull dockerpull.cn/openebs/provisioner-localpv:3.4.0
docker pull dockerpull.cn/openebs/linux-utils:3.5.0替换openebs-operator.yaml中的镜像
这里使用的perl命令，没有使用sed命令，左斜杠转义太烦人，不如用#来当分隔符
shell
perl -pi -e 's#openebs/node-disk-manager:2.1.0#dockerpull.cn/openebs/node-disk-manager:2.1.0#g' openebs-operator.yaml
perl -pi -e 's#openebs/node-disk-operator:2.1.0#dockerpull.cn/openebs/node-disk-operator:2.1.0#g' openebs-operator.yaml
perl -pi -e 's#openebs/node-disk-exporter:2.1.0#dockerpull.cn/openebs/node-disk-exporter:2.1.0#g' openebs-operator.yaml
perl -pi -e 's#openebs/provisioner-localpv:3.4.0#dockerpull.cn/openebs/provisioner-localpv:3.4.0#g' openebs-operator.yaml
perl -pi -e 's#openebs/linux-utils:3.5.0#dockerpull.cn/openebs/linux-utils:3.5.0#g' openebs-operator.yaml三、执行yaml
1.openebs-operator.yaml
shell
cd /data/openebs/
kubectl create -f openebs-operator.yaml
# 输出
namespace/openebs created
serviceaccount/openebs-maya-operator created
clusterrole.rbac.authorization.k8s.io/openebs-maya-operator created
clusterrolebinding.rbac.authorization.k8s.io/openebs-maya-operator created
customresourcedefinition.apiextensions.k8s.io/blockdevices.openebs.io created
customresourcedefinition.apiextensions.k8s.io/blockdeviceclaims.openebs.io created
configmap/openebs-ndm-config created
daemonset.apps/openebs-ndm created
deployment.apps/openebs-ndm-operator created
deployment.apps/openebs-ndm-cluster-exporter created
service/openebs-ndm-cluster-exporter-service created
daemonset.apps/openebs-ndm-node-exporter created
service/openebs-ndm-node-exporter-service created
deployment.apps/openebs-localpv-provisioner created
storageclass.storage.k8s.io/openebs-hostpath created
storageclass.storage.k8s.io/openebs-device created等待pod进入运行状态
shell
kubectl get pod -n openebs
# 输出
NAME READY STATUS RESTARTS AGE
openebs-localpv-provisioner-866f75fd74-hhm98 1/1 Running 0 32s
openebs-ndm-cluster-exporter-c9cdc6864-ml9jd 1/1 Running 0 32s
openebs-ndm-node-exporter-5zpl9 1/1 Running 0 32s
openebs-ndm-operator-6d58d6fdf7-wcb22 1/1 Running 0 32s
openebs-ndm-pdcbm 1/1 Running 0 32s查看存储类
shell
kubectl get sc -n default
# 输出
NAME PROVISIONER RECLAIMPOLICY VOLUMEBINDINGMODE ALLOWVOLUMEEXPANSION AGE
openebs-device openebs.io/local Delete WaitForFirstConsumer false 7m14s
openebs-hostpath openebs.io/local Delete WaitForFirstConsumer false 7m14s2.local-hostpath-pvc.yaml和local-hostpath-pod.yaml
shell
docker pull dockerpull.cn/busybox
perl -pi -e 's#busybox#dockerpull.cn/busybox#g' local-hostpath-pod.yaml
kubectl create -f local-hostpath-pvc.yaml
kubectl create -f local-hostpath-pod.yaml查看测试的pv和pod
shell
kubectl get pod -n default
# 输出
NAME READY STATUS RESTARTS AGE
hello-local-hostpath-pod 1/1 Running 0 19s
kubectl get pvc -n default
# 输出
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
local-hostpath-pvc Bound pvc-d2d776a1-656e-49e7-bfff-34ebaa26481a 5G RWO openebs-hostpath 5m18s四、关于默认存储路径/var/openebs/local/修改的问题
默认的存储路径是/var/openebs/local/，在生产环境中最好是配置到一个高性能的有保障的目录下。
准备一个专属目录
shell
mkdir -p /hdd_data/openebs_data/修改存储类配置
yaml
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
name: openebs-hostpath
...
- name: BasePath
#value: "/var/openebs/local/"
value: "/hdd_data/openebs_data/"创建
shell
kubectl create -f openebs-operator.yaml
kubectl create -f local-hostpath-pvc.yaml
kubectl create -f local-hostpath-pod.yaml
kubectl get pvc
# 输出
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
local-hostpath-pvc Bound pvc-300671fc-34b1-46dd-bc1c-eaa2feeee754 5G RWO openebs-hostpath 4m18s查看卷是否创建到专属目录
shell
ll /hdd_data/openebs_data/
total 0
drwxrwxrwx 2 root root 23 Apr 29 15:59 pvc-300671fc-34b1-46dd-bc1c-eaa2feeee754五、设置默认存储类
shell
kubectl patch storageclass openebs-hostpath -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'总结
简单记录一下使用方式，