Kubernetes

1，准备工作

1.1 所有节点安装GFS客户端

yum install glusterfs glusterfs-fuse -y

1.2 如果不是所有节点要部署GFS管理服务，就在需要部署的节点上打上标签

[root@k8s-master01 ~]# kubectl label node k8s-master01 storagenode=glusterfs
node/k8s-master01 labeled
[root@k8s-master01 ~]# kubectl label node k8s-node01 storagenode=glusterfs
node/k8s-node01 labeled
[root@k8s-master01 ~]# kubectl label node k8s-node02 storagenode=glusterfs
node/k8s-node02 labeled

1.3 载入指定的个别模块

modprobe dm_snapshot
modprobe dm_mirror
modprobe dm_thin_pool

2，创建GFS管理服务容器集群

本文采用容器化方式部署GFS，公司如有GFS集群可直接使用。
GFS已Daemonset的方式进行部署，保证每台需要部署GFS管理服务的Node上都运行一个GFS管理服务。
下载相关文件：

wget https://github.com/heketi/heketi/releases/download/v8.0.0/heketi-client-v8.0.0.linux.amd64.tar.gz

2.1 创建集群

[root@k8s-master01 kubernetes]# pwd
/opt/k8s-cluster/heketi-client/share/heketi/kubernetes

注意1：此时采用的为默认的挂载方式，可使用其他磁盘当做GFS的工作目录。
注意2：此时创建的namespace为默认的default，按需更改
注意3：可使用gluster/gluster-centos:gluster3u12_centos7镜像

[root@k8s-master01 kubernetes]# kubectl create -f glusterfs-daemonset.json 
daemonset.extensions/glusterfs created

2.1.1 查看pods

[root@k8s-master01 kubernetes]# kubectl get pods -l glusterfs-node=daemonset
NAME              READY   STATUS    RESTARTS   AGE
glusterfs-fvxh7   1/1     Running   0          47m
glusterfs-jjw7b   1/1     Running   0          47m
glusterfs-td875   1/1     Running   0          47m

2.2 创建Heketi服务

Heketi是一个提供RESTful API管理GFS卷的框架，并能够在K8S、OpenShift、OpenStack等云平台上实现动态存储资源供应，支持GFS多集群管理，便于管理员对GFS进行操作。
创建Heketi的ServiceAccount对象：

[root@k8s-master01 kubernetes]# kubectl create -f heketi-service-account.json
serviceaccount/heketi-service-account created

[root@k8s-master01 kubernetes]# kubectl get sa
NAME                     SECRETS   AGE
default                  1         6d22h
heketi-service-account   1         18s

创建Heketi对应的权限和secret

[root@k8s-master01 kubernetes]# kubectl create clusterrolebinding heketi-gluster-admin --clusterrole=edit --serviceaccount=default:heketi-service-account
clusterrolebinding.rbac.authorization.k8s.io/heketi-gluster-admin created

[root@k8s-master01 kubernetes]# kubectl create secret generic heketi-config-secret --from-file=./heketi.json
secret/heketi-config-secret created

初始化部署Heketi

[root@k8s-master01 kubernetes]# kubectl create -f heketi-bootstrap.json
service/deploy-heketi created
deployment.extensions/deploy-heketi created

2.3 设置GFS集群

[root@k8s-master01 heketi-client]# pwd
/opt/k8s-cluster/heketi-client

[root@k8s-master01 heketi-client]# cp bin/heketi-cli /usr/local/bin/

[root@k8s-master01 heketi-client]# heketi-cli -v
heketi-cli v8.0.0

2.3.1 修改topology-sample，manage为GFS管理服务的Node节点主机名，storage为Node节点IP，devices为Node节点上的裸设备

[root@k8s-master01 kubernetes]# more topology-sample.json
{
  "clusters": [
    {
      "nodes": [
        {
          "node": {
            "hostnames": {
              "manage": [
                "k8s-master01"
              ],
              "storage": [
                "192.168.2.100"
              ]
            },
            "zone": 1
          },
          "devices": [
            {
              "name": "/dev/sdb",
              "destroydata": false
            }
          ]
        },
        {
          "node": {
            "hostnames": {
              "manage": [
                "k8s-node01"
              ],
              "storage": [
                "192.168.2.101"
              ]
            },
            "zone": 1
          },
          "devices": [
            {
              "name": "/dev/sdc",
              "destroydata": false
            }
          ]
        },
        {
          "node": {
            "hostnames": {
              "manage": [
                "k8s-node02"
              ],
              "storage": [
                "192.168.2.102"
              ]
            },
            "zone": 1
          },
          "devices": [
            {
              "name": "/dev/sdb",
              "destroydata": false
            }
          ]
        }
      ]
    }
  ]
}

2.3.2 查看当前pod的ClusterIP

[root@k8s-master01 kubernetes]# kubectl get service | grep heketi
deploy-heketi   ClusterIP   10.105.64.142   <none>        8080/TCP   27m

[root@k8s-master01 kubernetes]# curl 10.105.64.142:8080/hello
Hello from Heketi

[root@k8s-master01 kubernetes]# export HEKETI_CLI_SERVER=http://10.105.64.142:8080

2.3.3 添加存储设备

[root@k8s-master01 kubernetes]# heketi-cli topology load --json=topology-sample.json
Creating cluster ... ID: 4aedb5c75b1d84f6b1a329b7c2a93710
	Allowing file volumes on cluster.
	Allowing block volumes on cluster.
	Creating node k8s-master01 ... ID: 5dcfc78aad8217ff4d484b861f686b87
		Adding device /dev/sdb ... OK
	Creating node k8s-node01 ... ID: 091f9aa6c7a8371df10891d12c6cecc1
		Adding device /dev/sdc ... OK
	Creating node k8s-node02 ... ID: 4cb5c15c92825cbe4179def7a0df54b9
		Adding device /dev/sdb ... OK

注：初始化裸盘

dd if=/dev/zero of=/dev/sdb

2.3.4 创建heketi持久化卷

yum install device-mapper* -y

[root@k8s-master01 kubernetes]# heketi-cli setup-openshift-heketi-storage
Saving heketi-storage.json

[root@k8s-master01 kubernetes]# kubectl create -f heketi-storage.json
secret/heketi-storage-secret created
endpoints/heketi-storage-endpoints created
service/heketi-storage-endpoints created
job.batch/heketi-storage-copy-job created

报错

[root@k8s-master01 kubernetes]# heketi-cli setup-openshift-heketi-storage
Error: /usr/sbin/modprobe failed: 1
  thin: Required device-mapper target(s) not detected in your kernel.
  Run `lvcreate --help' for more information.
　　
# 解决办法：所有节点执行modprobe dm_thin_pool

2.3.5 删除中间产物

[root@k8s-master01 kubernetes]# kubectl delete all,service,jobs,deployment,secret --selector="deploy-heketi"
pod "deploy-heketi-858f965fd5-68459" deleted
service "deploy-heketi" deleted
deployment.apps "deploy-heketi" deleted
replicaset.apps "deploy-heketi-858f965fd5" deleted
job.batch "heketi-storage-copy-job" deleted
secret "heketi-storage-secret" deleted

2.3.6 创建持久化Heketi，持久化方式也可以选用其他方法

[root@k8s-master01 kubernetes]# kubectl create -f heketi-deployment.json
secret/heketi-db-backup created
service/heketi created
deployment.extensions/heketi created

2.3.7 查看GFS信息

查看pod

[root@k8s-master01 kubernetes]# kubectl get pod
NAME                              READY   STATUS      RESTARTS   AGE
glusterfs-2rbd2                   1/1     Running     0          15h
glusterfs-5dw27                   1/1     Running     0          15h
glusterfs-fwd7h                   1/1     Running     0          15h
heketi-754dfc7cdf-c65w4           1/1     Running     0          6m20s

查看最新部署的持久化Heketi的svc

[root@k8s-master01 kubernetes]# kubectl get service | grep heketi
heketi                     ClusterIP   10.96.115.101   <none>        8080/TCP   6m42s
heketi-storage-endpoints   ClusterIP   10.110.142.33   <none>        1/TCP      13m

更改HEKETI_CLI_SERVER的值

[root@k8s-master01 kubernetes]# export HEKETI_CLI_SERVER=http://10.96.115.101:8080
[root@k8s-master01 kubernetes]# curl $HEKETI_CLI_SERVER/hello
Hello from Heketi

查看GFS信息

[root@k8s-master01 kubernetes]# heketi-cli topology info

Cluster Id: 4aedb5c75b1d84f6b1a329b7c2a93710

    File:  true
    Block: true

    Volumes:

	Name: heketidbstorage
	Size: 2
	Id: a236230723d7617001e4fa20d3a96e28
	Cluster Id: 4aedb5c75b1d84f6b1a329b7c2a93710
	Mount: 192.168.2.101:heketidbstorage
	Mount Options: backup-volfile-servers=192.168.2.102,192.168.2.100
	Durability Type: replicate
	Replica: 3
	Snapshot: Disabled

		Bricks:
			Id: 0e66a2c4f7798ce66cd54d235231f60f
			Path: /var/lib/heketi/mounts/vg_a9a5f6bf3cd3a86b9500980b8c2a3bd7/brick_0e66a2c4f7798ce66cd54d235231f60f/brick
			Size (GiB): 2
			Node: 4cb5c15c92825cbe4179def7a0df54b9
			Device: a9a5f6bf3cd3a86b9500980b8c2a3bd7

			Id: 71f1fc7e2d02a5697a06c28990423f82
			Path: /var/lib/heketi/mounts/vg_de5f46481b715672c338ca7128bb6fca/brick_71f1fc7e2d02a5697a06c28990423f82/brick
			Size (GiB): 2
			Node: 5dcfc78aad8217ff4d484b861f686b87
			Device: de5f46481b715672c338ca7128bb6fca

			Id: 8f4067bfb6dc9785218a7d2ef615ef17
			Path: /var/lib/heketi/mounts/vg_38b3ee8f36f32d3e8f4e67115e2b9fc0/brick_8f4067bfb6dc9785218a7d2ef615ef17/brick
			Size (GiB): 2
			Node: 091f9aa6c7a8371df10891d12c6cecc1
			Device: 38b3ee8f36f32d3e8f4e67115e2b9fc0


    Nodes:

	Node Id: 091f9aa6c7a8371df10891d12c6cecc1
	State: online
	Cluster Id: 4aedb5c75b1d84f6b1a329b7c2a93710
	Zone: 1
	Management Hostnames: k8s-node01
	Storage Hostnames: 192.168.2.101
	Devices:
		Id:38b3ee8f36f32d3e8f4e67115e2b9fc0   Name:/dev/sdc            State:online    Size (GiB):15      Used (GiB):2       Free (GiB):13
			Bricks:
				Id:8f4067bfb6dc9785218a7d2ef615ef17   Size (GiB):2       Path: /var/lib/heketi/mounts/vg_38b3ee8f36f32d3e8f4e67115e2b9fc0/brick_8f4067bfb6dc9785218a7d2ef615ef17/brick

	Node Id: 4cb5c15c92825cbe4179def7a0df54b9
	State: online
	Cluster Id: 4aedb5c75b1d84f6b1a329b7c2a93710
	Zone: 1
	Management Hostnames: k8s-node02
	Storage Hostnames: 192.168.2.102
	Devices:
		Id:a9a5f6bf3cd3a86b9500980b8c2a3bd7   Name:/dev/sdb            State:online    Size (GiB):15      Used (GiB):2       Free (GiB):13
			Bricks:
				Id:0e66a2c4f7798ce66cd54d235231f60f   Size (GiB):2       Path: /var/lib/heketi/mounts/vg_a9a5f6bf3cd3a86b9500980b8c2a3bd7/brick_0e66a2c4f7798ce66cd54d235231f60f/brick

	Node Id: 5dcfc78aad8217ff4d484b861f686b87
	State: online
	Cluster Id: 4aedb5c75b1d84f6b1a329b7c2a93710
	Zone: 1
	Management Hostnames: k8s-master01
	Storage Hostnames: 192.168.2.100
	Devices:
		Id:de5f46481b715672c338ca7128bb6fca   Name:/dev/sdb            State:online    Size (GiB):15      Used (GiB):2       Free (GiB):13
			Bricks:
				Id:71f1fc7e2d02a5697a06c28990423f82   Size (GiB):2       Path: /var/lib/heketi/mounts/vg_de5f46481b715672c338ca7128bb6fca/brick_71f1fc7e2d02a5697a06c28990423f82/brick

2.4 定义StorageClass

Provisioner参数须设置为"kubernetes.io/glusterfs"
resturl地址为API Server所在主机可以访问到的Heketi服务的某个地址

[root@k8s-master01 kubernetes]# cat storageclass-gfs-heketi.yaml
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: gluster-heketi
provisioner: kubernetes.io/glusterfs
parameters:
  resturl: "http://10.96.115.101:8080"
  restauthenabled: "false"

[root@k8s-master01 kubernetes]# kubectl create -f storageclass-gfs-heketi.yaml
storageclass.storage.k8s.io/gluster-heketi created

2.5 定义PVC及测试Pod

定义pvc

[root@k8s-master01 kubernetes]# cat pod-use-pvc.yaml
apiVersion: v1
kind: Pod
metadata:
  name: pod-use-pvc
spec:
  containers:
  - name: pod-use-pvc
    image: busybox
    command:
    - sleep
    - "3600"
    volumeMounts:
    - name: gluster-volume
      mountPath: "/pv-data"
      readOnly: false
  volumes:
  - name: gluster-volume
    persistentVolumeClaim:
      claimName: pvc-gluster-heketi
---
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: pvc-gluster-heketi
spec:
  accessModes: [ "ReadWriteOnce" ]
  storageClassName: "gluster-heketi"
  resources:
    requests:
      storage: 1Gi

[root@k8s-master01 kubernetes]#  kubectl create -f pod-use-pvc.yaml
pod/pod-use-pvc created
persistentvolumeclaim/pvc-gluster-heketi created

PVC定义一旦生成，系统便触发Heketi进行相应的操作，主要为在GlusterFS集群上创建brick，再创建并启动一个volume
查看 pv，pvc

[root@k8s-master01 kubernetes]# kubectl get pv,pvc  | grep gluster

persistentvolume/pvc-b21c710b-ff41-11e8-87ec-000c2925b928   1Gi        RWO            Delete           Bound         default/pvc-gluster-heketigluster-heketi                          71s
persistentvolumeclaim/pvc-gluster-heketi   Bound    pvc-b21c710b-ff41-11e8-87ec-000c2925b928   1Gi        RWO            gluster-heketi   106s

3，测试数据

3.1 进入到pod并创建文件

[root@k8s-master01 kubernetes]# kubectl exec -ti pod-use-pvc -- /bin/sh
/ # cd /pv-data/
/pv-data # mkdir 1 2 3
/pv-data # ls
1  2  3

3.2 宿主机挂载测试

[root@k8s-master01 kubernetes]# heketi-cli topology info

Cluster Id: 4aedb5c75b1d84f6b1a329b7c2a93710

    File:  true
    Block: true

    Volumes:

	Name: vol_7712ca88a6ee8f3f9c616acf9b33e946
	Size: 1
	Id: 7712ca88a6ee8f3f9c616acf9b33e946
	Cluster Id: 4aedb5c75b1d84f6b1a329b7c2a93710
	Mount: 192.168.2.101:vol_7712ca88a6ee8f3f9c616acf9b33e946
	Mount Options: backup-volfile-servers=192.168.2.102,192.168.2.100
	Durability Type: replicate
	Replica: 3
	Snapshot: Enabled
....

3.3 或者使用volume list查看

[root@k8s-master01 kubernetes]# heketi-cli volume list
Id:7712ca88a6ee8f3f9c616acf9b33e946    Cluster:4aedb5c75b1d84f6b1a329b7c2a93710    Name:vol_7712ca88a6ee8f3f9c616acf9b33e946
Id:a236230723d7617001e4fa20d3a96e28    Cluster:4aedb5c75b1d84f6b1a329b7c2a93710    Name:heketidbstorage

3.4 挂载方式

Mount: 192.168.2.101:vol_7712ca88a6ee8f3f9c616acf9b33e946
volume Name：vol_56d636b452d31a9d4cb523d752ad0891

3.5 挂载

[root@k8s-master01 kubernetes]# mount -t glusterfs 192.168.2.101:vol_7712ca88a6ee8f3f9c616acf9b33e946 /mnt/

[root@k8s-master01 kubernetes]# ls /mnt/
1  2  3

4，测试Deployments

4.1 定义 nginx-gluster

[root@k8s-master01 kubernetes]# cat nginx-gluster.yaml
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: nginx-gfs
spec:
  replicas: 2
  template:
    metadata:
      labels:
        name: nginx
    spec:
      containers:
        - name: nginx
          image: nginx
          imagePullPolicy: IfNotPresent
          ports:
            - containerPort: 80
          volumeMounts:
            - name: nginx-gfs-html
              mountPath: "/usr/share/nginx/html"
            - name: nginx-gfs-conf
              mountPath: "/etc/nginx/conf.d"
      volumes:
      - name: nginx-gfs-html
        persistentVolumeClaim:
          claimName: glusterfs-nginx-html
      - name: nginx-gfs-conf
        persistentVolumeClaim:
          claimName: glusterfs-nginx-conf
---
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: glusterfs-nginx-html
spec:
  accessModes: [ "ReadWriteMany" ]
  storageClassName: "gluster-heketi"
  resources:
    requests:
      storage: 500Mi
---
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: glusterfs-nginx-conf
spec:
  accessModes: [ "ReadWriteMany" ]
  storageClassName: "gluster-heketi"
  resources:
    requests:
      storage: 10Mi

4.2 创建 nginx-gluster

[root@k8s-master01 kubernetes]# kubectl create -f nginx-gluster.yaml
deployment.extensions/nginx-gfs created
persistentvolumeclaim/glusterfs-nginx-html created
persistentvolumeclaim/glusterfs-nginx-conf created

4.3 查看

[root@k8s-master01 kubernetes]# kubectl get po,pvc,pv | grep nginx-gfs
pod/nginx-gfs-dbf47b7-5sft5           1/1     Running     0          63s

pod/nginx-gfs-dbf47b7-znlrl           1/1     Running     0          63s

4.4 查看挂载情况

[root@k8s-master01 kubernetes]# kubectl exec -ti nginx-gfs-dbf47b7-5sft5 -- df -Th
Filesystem                                         Type            Size  Used Avail Use% Mounted on
overlay                                            overlay          44G  9.4G   35G  22% /
tmpfs                                              tmpfs           3.9G     0  3.9G   0% /dev
tmpfs                                              tmpfs           3.9G     0  3.9G   0% /sys/fs/cgroup
/dev/mapper/centos-root                            xfs              44G  9.4G   35G  22% /etc/hosts
shm                                                tmpfs            64M     0   64M   0% /dev/shm
192.168.2.100:vol_11237ec517d6e79fbc5ca193adbaff19 fuse.glusterfs 1014M   33M  982M   4% /etc/nginx/conf.d
192.168.2.100:vol_67f553b5ce7bbe5360cf4b5c4fdbeda8 fuse.glusterfs 1014M   33M  982M   4% /usr/share/nginx/html
tmpfs                                              tmpfs           3.9G   12K  3.9G   1% /run/secrets/kubernetes.io/serviceaccount
tmpfs                                              tmpfs           3.9G     0  3.9G   0% /sys/firmware

[root@k8s-master01 kubernetes]# kubectl exec -ti nginx-gfs-dbf47b7-znlrl -- df -Th
Filesystem                                         Type            Size  Used Avail Use% Mounted on
overlay                                            overlay          44G   11G   34G  25% /
tmpfs                                              tmpfs           3.9G     0  3.9G   0% /dev
tmpfs                                              tmpfs           3.9G     0  3.9G   0% /sys/fs/cgroup
/dev/mapper/centos-root                            xfs              44G   11G   34G  25% /etc/hosts
shm                                                tmpfs            64M     0   64M   0% /dev/shm
192.168.2.100:vol_11237ec517d6e79fbc5ca193adbaff19 fuse.glusterfs 1014M   33M  982M   4% /etc/nginx/conf.d
192.168.2.100:vol_67f553b5ce7bbe5360cf4b5c4fdbeda8 fuse.glusterfs 1014M   33M  982M   4% /usr/share/nginx/html
tmpfs                                              tmpfs           3.9G   12K  3.9G   1% /run/secrets/kubernetes.io/serviceaccount
tmpfs                                              tmpfs           3.9G     0  3.9G   0% /sys/firmware

4.5 挂载并创建index.html

[root@k8s-master01 kubernetes]# mount -t glusterfs 192.168.2.100:vol_67f553b5ce7bbe5360cf4b5c4fdbeda8 /mnt/

[root@k8s-master01 kubernetes]# ls /mnt/

[root@k8s-master01 kubernetes]# echo -e "`date`
hello ngins-glusterfs" > /mnt/index.html

[root@k8s-master01 kubernetes]# cat /mnt/index.html
Fri Dec 14 10:07:43 CST 2018
hello ngins-glusterfs

[root@k8s-master01 kubernetes]# kubectl exec -it nginx-gfs-dbf47b7-znlrl -- cat /usr/share/nginx/html/index.html
Fri Dec 14 10:07:43 CST 2018
hello ngins-glusterfs

4.6 扩容nginx

查看 deployment

[root@k8s-master01 kubernetes]# kubectl get deployment
NAME        DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
heketi      1         1         1            1           43m
nginx-gfs   2         2         2            2           13m

更改replicas

[root@k8s-master01 kubernetes]# kubectl scale deployment nginx-gfs --replicas 3
deployment.extensions/nginx-gfs scaled

查看

[root@k8s-master01 kubernetes]# kubectl get deployment
NAME        DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
heketi      1         1         1            1           45m
nginx-gfs   3         3         3            3           16m

[root@k8s-master01 kubernetes]# kubectl get pod
NAME                              READY   STATUS      RESTARTS   AGE
glusterfs-2rbd2                   1/1     Running     0          16h
glusterfs-5dw27                   1/1     Running     0          16h
glusterfs-fwd7h                   1/1     Running     0          16h
heketi-754dfc7cdf-c65w4           1/1     Running     0          45m
nginx-gfs-dbf47b7-498mr           1/1     Running     0          70s
nginx-gfs-dbf47b7-5sft5           1/1     Running     0          15m
nginx-gfs-dbf47b7-znlrl           1/1     Running     0          15m
pod-use-pvc                       1/1     Running     0          31m
recycler-for-pv-redis-cluster-2   0/1     Completed   0          15h
recycler-for-pv-redis-cluster-5   0/1     Completed   0          15h

[root@k8s-master01 kubernetes]# kubectl exec -it nginx-gfs-dbf47b7-498mr -- cat /usr/share/nginx/html/index.html
Fri Dec 14 10:07:43 CST 2018
hello ngins-glusterfs

5，扩容GlusterFS

5.1 添加磁盘至已存在的node节点 k8s-node02

5.1.1 查看k8s-node02部署的pod name及IP

[root@k8s-master01 kubernetes]# kubectl get pod -o wide -l glusterfs-node
NAME              READY   STATUS    RESTARTS   AGE   IP              NODE           NOMINATED NODE
glusterfs-2rbd2   1/1     Running   0          16h   192.168.2.100   k8s-master01   <none>
glusterfs-5dw27   1/1     Running   0          16h   192.168.2.101   k8s-node01     <none>
glusterfs-fwd7h   1/1     Running   0          16h   192.168.2.102   k8s-node02     <none>

5.1.2 在 k8s-node02 上确认新添加的盘符

Disk /dev/sdc: 107.4 GB, 107374182400 bytes, 209715200 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

5.1.3 使用heketi-cli查看cluster ID和所有node ID

[root@k8s-master01 kubernetes]# heketi-cli cluster list
Clusters:
Id:4aedb5c75b1d84f6b1a329b7c2a93710 [file][block]

[root@k8s-master01 kubernetes]# heketi-cli cluster info 4aedb5c75b1d84f6b1a329b7c2a93710
Cluster id: 4aedb5c75b1d84f6b1a329b7c2a93710
Nodes:
091f9aa6c7a8371df10891d12c6cecc1
4cb5c15c92825cbe4179def7a0df54b9
5dcfc78aad8217ff4d484b861f686b87
Volumes:
11237ec517d6e79fbc5ca193adbaff19
67f553b5ce7bbe5360cf4b5c4fdbeda8
7712ca88a6ee8f3f9c616acf9b33e946
a236230723d7617001e4fa20d3a96e28
Block: true

File: true

5.1.4 找到对应的k8s-node02的node ID

[root@k8s-master01 kubernetes]# heketi-cli node info 4cb5c15c92825cbe4179def7a0df54b9
Node Id: 4cb5c15c92825cbe4179def7a0df54b9
State: online
Cluster Id: 4aedb5c75b1d84f6b1a329b7c2a93710
Zone: 1
Management Hostname: k8s-node02
Storage Hostname: 192.168.2.102
Devices:
Id:a9a5f6bf3cd3a86b9500980b8c2a3bd7   Name:/dev/sdb            State:online    Size (GiB):15      Used (GiB):5       Free (GiB):10      Bricks:4

5.1.5 添加磁盘至GFS集群的node02

[root@k8s-master01 kubernetes]# heketi-cli device add --name=/dev/sdc --node=4cb5c15c92825cbe4179def7a0df54b9
Device added successfully

5.1.6 查看结果

[root@k8s-master01 kubernetes]# heketi-cli node info 4cb5c15c92825cbe4179def7a0df54b9
Node Id: 4cb5c15c92825cbe4179def7a0df54b9
State: online
Cluster Id: 4aedb5c75b1d84f6b1a329b7c2a93710
Zone: 1
Management Hostname: k8s-node02
Storage Hostname: 192.168.2.102
Devices:
Id:8132038da0b70cde967c0cb8b80dc487   Name:/dev/sdc            State:online    Size (GiB):99      Used (GiB):0       Free (GiB):99      Bricks:0
Id:a9a5f6bf3cd3a86b9500980b8c2a3bd7   Name:/dev/sdb            State:online    Size (GiB):15      Used (GiB):5       Free (GiB):10      Bricks:4

5.2 添加新节点

将k8s-node03，IP为 192.168.2.103 的加入glusterfs集群，并将该节点的/dev/sdb加入到集群

5.2.1 打上label

[root@k8s-master01 kubernetes]# kubectl label node k8s-node03 storagenode=glusterfs
node/k8s-node03labeled

[root@k8s-master01 kubernetes]# kubectl  get pod -owide -l glusterfs-node
NAME              READY   STATUS    RESTARTS   AGE   IP              NODE           NOMINATED NODE
glusterfs-2rbd2   1/1     Running   0          17h   192.168.2.100   k8s-master01   <none>
glusterfs-5dw27   1/1     Running   0          17h   192.168.2.101   k8s-node01     <none>
glusterfs-fwd7h   1/1     Running   0          17h   192.168.2.102   k8s-node02     <none>
glusterfs-33d7h   1/1     Running   0          3m   192.168.2.103   k8s-node03     <none>

5.2.2 在任意节点执行peer probe

[root@k8s-master01 kubernetes]# kubectl exec -ti glusterfs-33d7h  -- gluster peer probe 192.168.2.103
peer probe: success.

5.2.3 将新节点加入到glusterfs集群中

[root@k8s-master01 kubernetes]# heketi-cli cluster list
Clusters:
Id:4aedb5c75b1d84f6b1a329b7c2a93710[file][block]

[root@k8s-master01 kubernetes]# heketi-cli node add --zone=1 --cluster=4aedb5c75b1d84f6b1a329b7c2a93710 --management-host-name=k8s-node03--storage-host-name=192.168.2.103
Node information:
Id: 150bc8c458a70310c6137e840619758c
State: online
Cluster Id: 4aedb5c75b1d84f6b1a329b7c2a93710 
Zone: 1
Management Hostname k8s-node03
Storage Hostname 192.168.2.103

5.2.4 将新节点的磁盘加入到集群中

[root@k8s-master01 kubernetes]# heketi-cli device add --name=/dev/sdb --node=150bc8c458a70310c6137e840619758c
Device added successfull

5.2.5 验证

[root@k8s-master01 kubernetes]# heketi-cli node list
Id:091f9aa6c7a8371df10891d12c6cecc1	Cluster:4aedb5c75b1d84f6b1a329b7c2a93710
Id:4cb5c15c92825cbe4179def7a0df54b9	Cluster:4aedb5c75b1d84f6b1a329b7c2a93710
Id:5dcfc78aad8217ff4d484b861f686b87	Cluster:4aedb5c75b1d84f6b1a329b7c2a93710
Id:150bc8c458a70310c6137e840619758c     Cluster:4aedb5c75b1d84f6b1a329b7c2a93710

[root@k8s-master01 kubernetes]# heketi-cli node info 150bc8c458a70310c6137e840619758c
Node Id: 150bc8c458a70310c6137e840619758c
State: online
Cluster Id: 4aedb5c75b1d84f6b1a329b7c2a93710
Zone: 1
Management Hostname: k8s-master03
Storage Hostname: 192.168.2.103
Devices:
Id:2d5210c19858fb7ea3f805e6f582ecce   Name:/dev/sdb            State:online    Size (GiB):39      Used (GiB):0       Free (GiB):39      Bricks:0

注：扩容volume可使用 heketi-cli volume expand --volume=volumeID --expand-size=10

6，重启heketi报错解决

6.1 报错如下：

[heketi] ERROR 2018/12/14 11:57:51 heketi/apps/glusterfs/app.go:185:glusterfs.NewApp: Heketi was terminated while performing one or more operations. Server may refuse to start as long as pending operations are present in the db.

6.2 解决

修改heketi.json，添加 "brick_min_size_gb" : 1,

[root@k8s-master01 kubernetes]# cat heketi.json 
{
  "_port_comment": "Heketi Server Port Number",
  "port": "8080",

  "_use_auth": "Enable JWT authorization. Please enable for deployment",
  "use_auth": false,

  "_jwt": "Private keys for access",
  "jwt": {
    "_admin": "Admin has access to all APIs",
    "admin": {
      "key": "My Secret"
    },
    "_user": "User only has access to /volumes endpoint",
    "user": {
      "key": "My Secret"
    }
  },

  "_glusterfs_comment": "GlusterFS Configuration",
  "glusterfs": {
    "_executor_comment": "Execute plugin. Possible choices: mock, kubernetes, ssh",
    "executor": "kubernetes",

    "_db_comment": "Database file name",
    "db": "/var/lib/heketi/heketi.db",
    "brick_min_size_gb" : 1,

    "kubeexec": {
      "rebalance_on_expansion": true
    },

    "sshexec": {
      "rebalance_on_expansion": true,
      "keyfile": "/etc/heketi/private_key",
      "fstab": "/etc/fstab",
      "port": "22",
      "user": "root",
      "sudo": false
    }
  },

  "_backup_db_to_kube_secret": "Backup the heketi database to a Kubernetes secret when running in Kubernetes. Default is off.",
  "backup_db_to_kube_secret": false
}

6.3 删除secret并重建

[root@k8s-master01 kubernetes]# kubectl delete secret heketi-config-secret
[root@k8s-master01 kubernetes]# kubectl create secret generic heketi-config-secret --from-file heketi.json

6.4 更改heketi的deployment

# env添加变量如下
- name: HEKETI_IGNORE_STALE_OPERATIONS
          value: "true"

7，GFS容器无法启动

glusterd.service - GlusterFS, a clustered file-system server Loaded: loaded (/usr/lib/systemd/system/glusterd.service; enabled; vendor preset: disabled

解决(新建集群，无数据)：

rm -rf /var/lib/heketi/
rm -rf /var/lib/glusterd
rm -rf /etc/glusterfs/
yum remove glusterfs -y
yum install glusterfs glusterfs-fuse -y

参考：
- https://www.cnblogs.com/dukuan/p/9954094.html
- https://www.kubernetes.org.cn/3893.html

相关阅读:
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原文地址：https://www.cnblogs.com/xiaoqshuo/p/10096682.html

Kubernetes

1，准备工作

1.1 所有节点安装GFS客户端

1.2 如果不是所有节点要部署GFS管理服务，就在需要部署的节点上打上标签

1.3 载入指定的个别模块

2，创建GFS管理服务容器集群

2.1 创建集群

2.1.1 查看pods

2.2 创建Heketi服务

2.3 设置GFS集群

2.3.1 修改topology-sample，manage为GFS管理服务的Node节点主机名，storage为Node节点IP，devices为Node节点上的裸设备

2.3.2 查看当前pod的ClusterIP

2.3.3 添加存储设备

2.3.4 创建heketi持久化卷

2.3.5 删除中间产物

2.3.6 创建持久化Heketi，持久化方式也可以选用其他方法

2.3.7 查看GFS信息

2.4 定义StorageClass

2.5 定义PVC及测试Pod

3，测试数据

3.1 进入到pod并创建文件

3.2 宿主机挂载测试

3.3 或者使用volume list查看

3.4 挂载方式

3.5 挂载

4，测试Deployments

4.1 定义 nginx-gluster

4.2 创建 nginx-gluster

4.3 查看

4.4 查看挂载情况

4.5 挂载 并 创建index.html

4.6 扩容nginx

5，扩容GlusterFS

5.1 添加磁盘至已存在的node节点 k8s-node02

5.1.1 查看k8s-node02部署的pod name及IP

5.1.2 在 k8s-node02 上确认新添加的盘符

5.1.3 使用heketi-cli查看cluster ID和所有node ID

5.1.4 找到对应的k8s-node02的node ID

5.1.5 添加磁盘至GFS集群的node02

5.1.6 查看结果

5.2 添加新节点

5.2.1 打上label

5.2.2 在任意节点执行peer probe

5.2.3 将新节点加入到glusterfs集群中

5.2.4 将新节点的磁盘加入到集群中

5.2.5 验证

6，重启heketi报错解决

6.1 报错如下：

6.2 解决

6.3 删除secret并重建

6.4 更改heketi的deployment

7，GFS容器无法启动

4.5 挂载并创建index.html