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openshift 4.10 single node, post-install, lvm and nfs

single node ocp，如果有一块单独的硬盘，那么可以用lvm operator来自动分配lvm，创建存储给应用用。我们接下来在这个存储基础上配置nfs，就变成了一个集群内部的nfs服务。

视频讲解

install lvm operator

we need local storage, and we are single node openshift, so we use lvm operator, find the operator from operator hub and install :

lvm operator is in TP, so it is buggy, we need some fix.


        # oc create ns lvm-operator-system
        
        cat << EOF > /data/install/lvm-operator.yaml
        ---
        apiVersion: v1
        kind: Namespace
        metadata:
          name: lvm-operator-system
          annotations:
            workload.openshift.io/allowed: management
        ---
        apiVersion: operators.coreos.com/v1
        kind: OperatorGroup
        metadata:
          name: lvm-operator-system
          namespace: lvm-operator-system
        spec:
          targetNamespaces:
          - lvm-operator-system
        ---
        apiVersion: operators.coreos.com/v1alpha1
        kind: Subscription
        metadata:
          name: odf-lvm-operator
          namespace: lvm-operator-system
        spec:
          channel: "stable-4.10"
          installPlanApproval: Manual
          name: odf-lvm-operator
          source: redhat-operators
          sourceNamespace: openshift-marketplace
        EOF
        oc create -f /data/install/lvm-operator.yaml
        
        # oc delete -f /data/install/lvm-operator.yaml
        
        
        ssh -tt core@192.168.7.13 -- lsblk
        
        # NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
        
        # sr0     11:0    1  1024M  0 rom
        
        # vda    252:0    0   120G  0 disk
        
        # ├─vda1 252:1    0     1M  0 part
        
        # ├─vda2 252:2    0   127M  0 part
        
        # ├─vda3 252:3    0   384M  0 part /boot
        
        # └─vda4 252:4    0 119.5G  0 part /sysroot
        
        # vdb    252:16   0   100G  0 disk
        
        oc adm policy add-cluster-role-to-user cluster-admin system:serviceaccount:lvm-operator-system:topolvm-controller -n lvm-operator-system
        
        oc adm policy add-cluster-role-to-user cluster-admin system:serviceaccount:lvm-operator-system:vg-manager -n lvm-operator-system
        
        oc adm policy add-cluster-role-to-user cluster-admin system:serviceaccount:lvm-operator-system:topolvm-node -n lvm-operator-system
        
        cat << EOF > /data/install/lvm.op.yaml
        apiVersion: lvm.topolvm.io/v1alpha1
        kind: LVMCluster
        metadata:
          name: lvmcluster-sample
        spec:
          storage:
            deviceClasses:
            - name: vg1
            #   thinPoolConfig:
            #     name: thin-pool-1
            #     sizePercent: 50
            #     overprovisionRatio: 50
        EOF
        oc create -n lvm-operator-system -f /data/install/lvm.op.yaml
        
        kubectl patch storageclass odf-lvm-vg1 -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'
        
        
        cat << EOF > /data/install/lvm.op.pvc.sample.yaml
        apiVersion: v1
        kind: PersistentVolumeClaim
        metadata:
          name: lvm-file-pvc
        spec:
          volumeMode: Filesystem
          accessModes:
            - ReadWriteOnce
          resources:
            requests:
              storage: 5Gi
          storageClassName: odf-lvm-vg1
        EOF
        oc create -f /data/install/lvm.op.pvc.sample.yaml -n default
        
        cat <<EOF > /data/install/lvm.op.app.sample.yaml
        apiVersion: v1
        kind: Pod
        metadata:
          name: app-file
        spec:
          containers:
          - name: app-file
            image: registry.access.redhat.com/ubi8/ubi:8.4
            imagePullPolicy: IfNotPresent
            command: ["/usr/bin/bash", "-c", "/usr/bin/tail -f /dev/null"]
            volumeMounts:
            - mountPath: "/mnt/file"
              name: lvm-file-pvc
          volumes:
            - name: lvm-file-pvc
              persistentVolumeClaim:
                claimName: lvm-file-pvc
        EOF
        oc create -f /data/install/lvm.op.app.sample.yaml -n default

install nfs service inside cluster


        oc create ns nfs-system
        
        oc project nfs-system
        
        cd /data/install
        
        wget -O nfs.all.yaml https://raw.githubusercontent.com/wangzheng422/nfs-ganesha-server-and-external-provisioner/wzh/deploy/openshift/nfs.all.yaml
        
        oc create -n nfs-system -f nfs.all.yaml
        
        # try it out
        
        wget -O nfs.demo.yaml https://raw.githubusercontent.com/wangzheng422/nfs-ganesha-server-and-external-provisioner/wzh/deploy/openshift/nfs.demo.yaml
        
        oc create -n default -f nfs.demo.yaml