在k8s中部署glusterfs-kubernetes

GlusterFS是一个开源的分布式文件系统，具有强大的横向扩展能力，通过扩展能够支持数PB存储容量和处理数千客户端。GlusterFS借助TCP/IP或InfiniBandRDMA网络将物理分布的存储资源聚集在一起，使用单一全局命名空间来管理数据。
Heketi（https://github.com/heketi/heketi），是一个基于RESTful API的GlusterFS卷管理框架。Heketi可以方便地和云平台整合，提供RESTful API供Kubernetes调用，实现多GlusterFS集群的卷管理。另外，Heketi还有保证bricks和它对应的副本均匀分布在集群中的不同可用区的优点。

环境

[root@k8s-master ~]# kubectl get nodes
NAME         STATUS   ROLES         AGE   VERSION
k8s-master   Ready    master,node   44d   v1.13.7
k8s-node1    Ready    master,node   44d   v1.13.7
k8s-node2    Ready    master,node   44d   v1.13.7

三台机器每台都新增一块硬盘/dev/sdb

给安装glusterfs机器打label，因为我这里只有三台机器，所以我就直接指定了all打得label

kubectl label nodes --all storagenode=glusterfs

每台机器都安装glusterfs得客户端软件和加载需要得内核模块

yum install -y glusterfs-client
modprobe  dm_snapshot
modprobe   dm_mirror
modprobe   dm_thin_pool

[root@kube-node1 ~]# vi /etc/sysconfig/modules/glusterfs.modules 
#!/bin/bash

for kernel_module in dm_snapshot dm_mirror dm_thin_pool;do
    /sbin/modinfo -F filename ${kernel_module} > /dev/null 2>&1
    if [ $? -eq 0 ]; then
        /sbin/modprobe ${kernel_module}
    fi 
done;

[root@kube-node1 ~]# chmod +x /etc/sysconfig/modules/glusterfs.modules 

部署GlusterFS

git clone https://github.com/gluster/gluster-kubernetes.git

修改拓扑配置文件

cd gluster-kubernetes/deploy
cp topology.json.sample topology.json

cat topology.json
{
  "clusters": [
    {
      "nodes": [
        {
          "node": {
            "hostnames": {
              "manage": [
                "k8s-master"   ###  node hostname
              ],
              "storage": [
                "192.168.4.180"   ### node ip
              ]
            },
            "zone": 1
          },
          "devices": [
            "/dev/sdb"    ###  node disk
          ]
        },
        {
          "node": {
            "hostnames": {
              "manage": [
                "k8s-node1"
              ],
              "storage": [
                "192.168.4.104"
              ]
            },
            "zone": 1
          },
          "devices": [
            "/dev/sdb"
          ]
        },
        {
          "node": {
            "hostnames": {
              "manage": [
                "k8s-node2"
              ],
              "storage": [
                "192.168.4.227"
              ]
            },
            "zone": 1
          },
          "devices": [
            "/dev/sdb"
          ]
        }
      ]
    }
  ]
}
kubeadm 1.15.3版本 kubectl get pod 没有--show-all选项了
因此需要修改gk-deploy脚本
把`heketi_pod=$(${CLI} get pod --no-headers --show-all --selector="heketi" | awk '{print $1}')` 改成 `heketi_pod=$(${CLI} get pod --no-headers -A --selector="heketi" | awk '{print $2}')`



初始化gluster集群，和 heketi
kubectl create ns glusterfs
./gk-deploy -g --admin-key adminkey --user-key userkey -y -n glusterfs
删除gluster集群
    ./gk-deploy --abort --admin-key adminkey --user-key userkey -y -n glusterfs
kubectl delete ns glusterfs

如果安装过程中有问题 需要重装，需要进行一下步骤
./gk-deploy --abort --admin-key adminkey --user-key userkey -y -n glusterfs
kubectl delete ns glusterfs
下面命令是每个glusterfs集群需做的
dmsetup ls
dmsetup remove_all
 rm -rf /var/log/glusterfs/
rm -rf /var/lib/heketi
 rm -rf /var/lib/glusterd/
 rm -rf /etc/glusterfs/
dd if=/dev/zero of=/dev/sdb bs=512k count=1   # 这里的/dev/sdb是要写你配置的硬盘路径

下载heketi客户端

wget https://github.com/heketi/heketi/releases/download/v9.0.0/heketi-client-v9.0.0.linux.amd64.tar.gz

heketi相关操作

导出HEKETI SERVER地址
[root@k8s-master ~]# export HEKETI_CLI_SERVER=http://$( kubectl get svc heketi -n glusterfs -o go-template='{{.spec.clusterIP}}'):8080

查看拓扑信息
[root@k8s-master ~]# heketi-cli --user admin --secret adminkey topology info

列出volume
[root@k8s-master ~]# heketi-cli --user admin --secret adminkey volume list
Id:6a20563884e39264d7111331ad641dee    Cluster:375e1a7040cafe02c5da11b633a0bee8    Name:heketidbstorage

查看volume信息
[root@k8s-master ~]# heketi-cli --user admin --secret adminkey volume info 6a20563884e39264d7111331ad641dee
Name: heketidbstorage
Size: 2
Volume Id: 6a20563884e39264d7111331ad641dee
Cluster Id: 375e1a7040cafe02c5da11b633a0bee8
Mount: 192.168.4.227:heketidbstorage
Mount Options: backup-volfile-servers=192.168.4.180,192.168.4.104
Block: false
Free Size: 0
Reserved Size: 0
Block Hosting Restriction: (none)
Block Volumes: []
Durability Type: replicate
Distribute Count: 1
Replica Count: 3

生成endpoints配置文件并创建

[root@k8s-master ~]# heketi-cli volume create  --user admin --secret adminkey --size=5 
   --persistent-volume 
   --persistent-volume-endpoint=heketi-storage-endpoints >heketi-storage-endpoints.yaml

[root@k8s-master ~]# cat heketi-storage-endpoints.yaml 
{
  "kind": "PersistentVolume",
  "apiVersion": "v1",
  "metadata": {
    "name": "glusterfs-ae93a2ad",
    "creationTimestamp": null,
    "annotations": {
      "pv.beta.kubernetes.io/gid": "0"
    }
  },
  "spec": {
    "capacity": {
      "storage": "5Gi"
    },
    "glusterfs": {
      "endpoints": "heketi-storage-endpoints",
      "path": "vol_ae93a2ad69e4536f946fc1d7ccb30ba1"
    },
    "accessModes": [
      "ReadWriteMany"
    ],
    "persistentVolumeReclaimPolicy": "Retain"
  },
  "status": {}
}

创建pv
[root@k8s-master ~]# kubectl apply -f heketi-storage-endpoints.yaml
[root@k8s-master ~]# kubectl get pv
NAME                 CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS      CLAIM              STORAGECLASS   REASON   AGE
glusterfs-ae93a2ad   5Gi        RWX            Retain           Available                                              12s

查看svc和ep
[root@k8s-master ~]# kubectl get svc,ep
NAME                                  TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)          AGE
service/heketi                        ClusterIP   10.254.253.62   <none>        8080/TCP         52m
service/heketi-storage-endpoints      ClusterIP   10.254.5.159    <none>        1/TCP            53m
service/kubernetes                    ClusterIP   10.254.0.1      <none>        443/TCP          46d
service/nginx-ingress-nginx-ingress   ClusterIP   10.254.9.197    <none>        80/TCP,443/TCP   6d5h

NAME                                    ENDPOINTS                                                  AGE
endpoints/heketi                        172.30.208.2:8080                                          52m
endpoints/heketi-storage-endpoints      192.168.4.104:1,192.168.4.180:1,192.168.4.227:1            53m
endpoints/kubernetes                    192.168.4.104:6443,192.168.4.180:6443,192.168.4.227:6443   46d
endpoints/nginx-ingress-nginx-ingress   192.168.4.180:80,192.168.4.180:443                         6d5h


查看PVC配置文件
[root@k8s-master kube-templates]# kubectl get pvc
NAME               STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS     AGE
gluster-s3-claim   Bound    pvc-327cd12f-c3ec-11e9-b71f-000c29b732e9   5Gi        RWX            gluster-heketi   50s

查看busybox应用配置文件

[root@k8s-master ~]# cat app.yaml 
apiVersion: v1
kind: Pod
metadata:
  name: busybox
spec:
  containers:
    - image: busybox
      command:
        - sleep
        - "3600"
      name: busybox
      volumeMounts:
        - mountPath: /usr/share/busybox
          name: mypvc
  volumes:
    - name: mypvc
      persistentVolumeClaim:
        claimName: gluster-s3-claim

创建应用
[root@k8s-master ~]# kubectl apply -f app.yaml 
pod/busybox created

[root@k8s-master ~]# kubectl get pod
NAME                                           READY   STATUS    RESTARTS   AGE
busybox                                        1/1     Running   0          4m27s
glusterfs-klbqw                                1/1     Running   0          178m
glusterfs-md65v                                1/1     Running   0          178m
glusterfs-tfzf2                                1/1     Running   0          178m
heketi-69bcb5fb6b-jr9sv                        1/1     Running   0          170m
nginx-ingress-nginx-ingress-7764698b49-sn94f   1/1     Running   6          6d7h

[root@k8s-master ~]# kubectl exec -it busybox -- bash

/ # df -h
Filesystem                Size      Used Available Use% Mounted on
overlay                  17.0G     13.9G      3.1G  82% /
tmpfs                    64.0M         0     64.0M   0% /dev
tmpfs                     1.9G         0      1.9G   0% /sys/fs/cgroup
/dev/mapper/centos-root
                         17.0G     13.9G      3.1G  82% /dev/termination-log
/dev/mapper/centos-root
                         17.0G     13.9G      3.1G  82% /etc/resolv.conf
/dev/mapper/centos-root
                         17.0G     13.9G      3.1G  82% /etc/hostname
/dev/mapper/centos-root
                         17.0G     13.9G      3.1G  82% /etc/hosts
shm                      64.0M         0     64.0M   0% /dev/shm
192.168.4.104:vol_1fb8fc67ded41f0ad8a64aa3730e8635
                          5.0G     83.7M      4.9G   2% /usr/share/busybox

设置gluster storageClass，自动管理创建PV和PVC

创建gluster storageClass

admin得key，需要创建secret存放
kubectl create secret generic heketi-secret --type="kubernetes.io/glusterfs" --from-literal=key='adminkey'   --namespace=glusterfs

创建存储类   #clusterid可以通过heketi-cli --user admin --secret adminkey volume list 查看到
cat glusterfs-storageclass.yaml 
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: slow
  namespace: glusterfs
provisioner: kubernetes.io/glusterfs
parameters:
  resturl: "http://10.245.169.182:8080"
  clusterid: "d27bf12363831dfd94bccef4367d5ae1" 
  restauthenabled: "true"
  restuser: "admin"
  secretNamespace: "default"
  secretName: "heketi-secret"
  gidMin: "40000"
  gidMax: "50000"
  volumetype: "replicate:3"

[root@kube-master yaml]# kubectl apply -f glusterfs-storageclass.yaml 

创建statefulSet应用
[root@kube-master yaml]# cat nginx.yaml 
apiVersion: v1
kind: Service
metadata:
  name: nginx
  labels:
    app: nginx
spec:
  ports:
  - port: 80
    name: web
  clusterIP: None
  selector:
    app: nginx
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  labels:
    run: nginx
  name: nginx
spec:
  replicas: 3
  serviceName: "nginx"
  selector:
    matchLabels:
      run: nginx
  template:
    metadata:
      labels:
        run: nginx
    spec:
      containers:
      - image: nginx
        name: nginx
        ports:
        - containerPort: 80
          name: web
        volumeMounts:
        - name: www
          mountPath: /usr/share/nginx/html
  volumeClaimTemplates:
  - metadata:
      name: www
    spec:
      accessModes: [ "ReadWriteOnce" ]
      storageClassName: "slow"
      resources:
        requests:
          storage: 1Gi

[root@kube-master yaml]# kubectl apply -f nginx.yaml
[root@kube-master yaml]# kubectl get pv,pvc
NAME                                                        CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM                 STORAGECLASS   REASON   AGE
persistentvolume/pvc-229e21dc-9949-49ea-8f89-132402118682   1Gi        RWO            Delete           Bound    default/www-nginx-2   slow                    9m21s
persistentvolume/pvc-4759e787-3362-478d-9f8d-367a7350a659   1Gi        RWO            Delete           Bound    default/www-nginx-0   slow                    10m
persistentvolume/pvc-7eed3b09-09fc-4437-81bc-79f48d6e7654   1Gi        RWO            Delete           Bound    default/www-nginx-1   slow                    9m57s

NAME                                STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
persistentvolumeclaim/www-nginx-0   Bound    pvc-4759e787-3362-478d-9f8d-367a7350a659   1Gi        RWO            slow           10m
persistentvolumeclaim/www-nginx-1   Bound    pvc-7eed3b09-09fc-4437-81bc-79f48d6e7654   1Gi        RWO            slow           10m
persistentvolumeclaim/www-nginx-2   Bound    pvc-229e21dc-9949-49ea-8f89-132402118682   1Gi        RWO            slow           9m29s