Kubernetes部署（十）：储存之glusterfs和heketi部署
相关内容：
Kubernetes部署（一）：架构及功能说明
Kubernetes部署（二）：系统环境初始化
Kubernetes部署（三）：CA证书制作
Kubernetes部署（四）：ETCD集群部署
Kubernetes部署（五）：Haproxy、Keppalived部署
Kubernetes部署（六）：Master节点部署
Kubernetes部署（七）：Node节点部署
Kubernetes部署（八）：Flannel网络部署
Kubernetes部署（九）：CoreDNS、Dashboard、Ingress部署
Kubernetes部署（十）：储存之glusterfs和heketi部署
Kubernetes部署（十一）：管理之Helm和Rancher部署
Kubernetes部署（十二）：helm部署harbor企业级镜像仓库
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概观
本指南支持在Kubernetes集群中集成，部署和管理GlusterFS容器化存储节点。这使Kubernetes管理员能够为其用户提供可靠的共享存储。
包括设置指南、其中包含一个示例服务器pod，它使用动态配置的GlusterFS卷进行存储。对于那些希望测试或了解有关此主题的更多信息的人，请按照主要自述文件中的快速入门说明 了解gluster-kubernetes
本指南旨在演示Heketi在Kubernetes环境中管理Gluster的最小示例。
基础设施要求
- 一个正在运行的Kubernetes集群，至少有三个Kubernetes工作节点，每个节点至少连接一个可用的原始块设备（如EBS卷或本地磁盘）。
#使用file -s 查看硬盘如果显示为data则为原始块设备。如果不是data类型，可先用pvcreate，pvremove来变更。 [root@node-04 ~]# file -s /dev/sdc /dev/sdc: x86 boot sector, code offset 0xb8 [root@node-04 ~]# pvcreate /dev/sdc WARNING: dos signature detected on /dev/sdc at offset 510. Wipe it? [y/n]: y Wiping dos signature on /dev/sdc. Physical volume "/dev/sdc" successfully created. [root@node-04 ~]# pvremove /dev/sdc Labels on physical volume "/dev/sdc" successfully wiped. [root@node-04 ~]# file -s /dev/sdc /dev/sdc: data - 在glusterfs节点的宿主机需要安装glusterfs-client、glusterfs-fuse包和socat包。
yum install -y glusterfs-client glusterfs-fuse socat - 每个kubetnetes节点的宿主机需要加载dm_thin_pool模块
modprobe dm_thin_pool
客户端安装
Heketi提供CLI，为用户提供管理Kubernetes中GlusterFS的部署和配置的方法。 在您的客户端计算机上下载并安装下载并安装heketi-cli，下载的heketi-cli版本最好是和heketi服务端版本一致，不然可能会出现报错。
Kubernetes部署
部署GlusterFS DaemonSet
{ "kind": "DaemonSet", "apiVersion": "extensions/v1beta1", "metadata": { "name": "glusterfs", "labels": { "glusterfs": "deployment" }, "annotations": { "description": "GlusterFS Daemon Set", "tags": "glusterfs" } }, "spec": { "template": { "metadata": { "name": "glusterfs", "labels": { "glusterfs-node": "daemonset" } }, "spec": { "nodeSelector": { "storagenode" : "glusterfs" }, "hostNetwork": true, "containers": [ { "image": "gluster/gluster-centos:latest", "imagePullPolicy": "Always", "name": "glusterfs", "volumeMounts": [ { "name": "glusterfs-heketi", "mountPath": "/var/lib/heketi" }, { "name": "glusterfs-run", "mountPath": "/run" }, { "name": "glusterfs-lvm", "mountPath": "/run/lvm" }, { "name": "glusterfs-etc", "mountPath": "/etc/glusterfs" }, { "name": "glusterfs-logs", "mountPath": "/var/log/glusterfs" }, { "name": "glusterfs-config", "mountPath": "/var/lib/glusterd" }, { "name": "glusterfs-dev", "mountPath": "/dev" }, { "name": "glusterfs-cgroup", "mountPath": "/sys/fs/cgroup" } ], "securityContext": { "capabilities": {}, "privileged": true }, "readinessProbe": { "timeoutSeconds": 3, "initialDelaySeconds": 60, "exec": { "command": [ "/bin/bash", "-c", "systemctl status glusterd.service" ] } }, "livenessProbe": { "timeoutSeconds": 3, "initialDelaySeconds": 60, "exec": { "command": [ "/bin/bash", "-c", "systemctl status glusterd.service" ] } } } ], "volumes": [ { "name": "glusterfs-heketi", "hostPath": { "path": "/var/lib/heketi" } }, { "name": "glusterfs-run" }, { "name": "glusterfs-lvm", "hostPath": { "path": "/run/lvm" } }, { "name": "glusterfs-etc", "hostPath": { "path": "/etc/glusterfs" } }, { "name": "glusterfs-logs", "hostPath": { "path": "/var/log/glusterfs" } }, { "name": "glusterfs-config", "hostPath": { "path": "/var/lib/glusterd" } }, { "name": "glusterfs-dev", "hostPath": { "path": "/dev" } }, { "name": "glusterfs-cgroup", "hostPath": { "path": "/sys/fs/cgroup" } } ] } } } }$ kubectl create -f glusterfs-daemonset.json- 通过运行获取节点名称：
$ kubectl get nodes- 通过
storagenode=glusterfs在该节点上设置标签，将gluster容器部署到指定节点上。
[root@node-01 heketi]# kubectl label node 10.31.90.204 storagenode=glusterfs
[root@node-01 heketi]# kubectl label node 10.31.90.205 storagenode=glusterfs
[root@node-01 heketi]# kubectl label node 10.31.90.206 storagenode=glusterfs根据需要,验证pod正在节点上运行，至少应运行三个pod。
$ kubectl get pods接下来我们将为Heketi创建一个ServiceAccount：
{ "apiVersion": "v1", "kind": "ServiceAccount", "metadata": { "name": "heketi-service-account" } }$ kubectl create -f heketi-service-account.json我们现在必须建立该服务帐户控制gluster pod的能力。我们通过为新创建的服务帐户创建集群角色绑定来实现此目的。
$ kubectl create clusterrolebinding heketi-gluster-admin --clusterrole=edit --serviceaccount=default:heketi-service-account- 现在我们需要创建一个Kubernetes secret，它将保存我们的Heketi实例的配置。必须将配置文件设置为使用 kubernetes执行程序，以便Heketi服务器控制gluster pod。除此之外，您可以随意尝试配置选项。
{
"_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",
"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
}
$ kubectl create secret generic heketi-config-secret --from-file=./heketi.json- 接下来，我们需要部署一个初始Pod和一个服务来访问该pod。如下会有一个heketi-bootstrap.json文件。
提交文件并验证一切正常运行，如下所示：{ "kind": "List", "apiVersion": "v1", "items": [ { "kind": "Service", "apiVersion": "v1", "metadata": { "name": "deploy-heketi", "labels": { "glusterfs": "heketi-service", "deploy-heketi": "support" }, "annotations": { "description": "Exposes Heketi Service" } }, "spec": { "selector": { "name": "deploy-heketi" }, "ports": [ { "name": "deploy-heketi", "port": 8080, "targetPort": 8080 } ] } }, { "kind": "Deployment", "apiVersion": "extensions/v1beta1", "metadata": { "name": "deploy-heketi", "labels": { "glusterfs": "heketi-deployment", "deploy-heketi": "deployment" }, "annotations": { "description": "Defines how to deploy Heketi" } }, "spec": { "replicas": 1, "template": { "metadata": { "name": "deploy-heketi", "labels": { "name": "deploy-heketi", "glusterfs": "heketi-pod", "deploy-heketi": "pod" } }, "spec": { "serviceAccountName": "heketi-service-account", "containers": [ { "image": "heketi/heketi:8", "imagePullPolicy": "Always", "name": "deploy-heketi", "env": [ { "name": "HEKETI_EXECUTOR", "value": "kubernetes" }, { "name": "HEKETI_DB_PATH", "value": "/var/lib/heketi/heketi.db" }, { "name": "HEKETI_FSTAB", "value": "/var/lib/heketi/fstab" }, { "name": "HEKETI_SNAPSHOT_LIMIT", "value": "14" }, { "name": "HEKETI_KUBE_GLUSTER_DAEMONSET", "value": "y" } ], "ports": [ { "containerPort": 8080 } ], "volumeMounts": [ { "name": "db", "mountPath": "/var/lib/heketi" }, { "name": "config", "mountPath": "/etc/heketi" } ], "readinessProbe": { "timeoutSeconds": 3, "initialDelaySeconds": 3, "httpGet": { "path": "/hello", "port": 8080 } }, "livenessProbe": { "timeoutSeconds": 3, "initialDelaySeconds": 30, "httpGet": { "path": "/hello", "port": 8080 } } } ], "volumes": [ { "name": "db" }, { "name": "config", "secret": { "secretName": "heketi-config-secret" } } ] } } } } ] }
# kubectl create -f heketi-bootstrap.json
service "deploy-heketi" created
deployment "deploy-heketi" created
[root@node-01 heketi]# kubectl get pod
NAME READY STATUS RESTARTS AGE
deploy-heketi-8888799fd-cmfp6 1/1 Running 0 6m
glusterfs-7t5ls 1/1 Running 0 8m
glusterfs-drsx9 1/1 Running 0 8m
glusterfs-pnnn8 1/1 Running 0 8m- 现在Bootstrap Heketi服务正在运行，我们将配置端口转发，以便我们可以使用Heketi CLI与服务进行通信。使用Heketi pod的名称，运行以下命令：
kubectl port-forward deploy-heketi-8888799fd-cmfp6 :8080如果在运行命令的系统上本地端口8080空闲，则可以运行port-forward命令，以便它为了方便而绑定到8080：
kubectl port-forward deploy-heketi-8888799fd-cmfp6 18080:8080现在通过对Heketi服务运行示例查询来验证端口转发是否正常工作。该命令应该打印将要转发的本地端口。将其合并到URL中以测试服务，如下所示：
curl http://localhost:18080/hello
Handling connection for 18080
Hello from Heketi最后，为Heketi CLI客户端设置环境变量，以便它知道如何到达Heketi Server。
export HEKETI_CLI_SERVER=http://localhost:18080接下来，我们将向Heketi提供有关要管理的GlusterFS集群的信息。我们通过拓扑文件提供此信息 。您克隆的repo中有一个示例拓扑文件，名为topology-sample.json。拓扑指定运行GlusterFS容器的Kubernetes节点以及每个节点的相应原始块设备。
确保hostnames/manage指向下面显示的确切名称kubectl get nodes，并且hostnames/storage是存储网络的IP地址。
- 重要信息：此时，必须使用与服务器版本匹配的heketi-cli版本加载拓扑文件。作为最后的手段，Heketi容器附带了一份可以通过的方式访问的heketi-cli kubectl exec ...。
修改拓扑文件以反映您所做的选择，然后部署它，如下所示：
{
"clusters": [
{
"nodes": [
{
"node": {
"hostnames": {
"manage": [
"10.31.90.204"
],
"storage":[
"10.31.90.204"
]
},
"zone": 1
},
"devices": [
"/dev/sdc"
]
},
{
"node": {
"hostnames": {
"manage": [
"10.31.90.205"
],
"storage":[
"10.31.90.205"
]
},
"zone": 1
},
"devices": [
"/dev/sdc"
]
},
{
"node": {
"hostnames": {
"manage": [
"10.31.90.206"
],
"storage":[
"10.31.90.206"
]
},
"zone": 1
},
"devices": [
"/dev/sdc"
]
}
]
}
]
}
[root@node-01 ~]# heketi-cli topology load --json=top.json
Creating cluster ... ID: e758afb77ee26d5f969d7efee1516e64
Allowing file volumes on cluster.
Allowing block volumes on cluster.
Creating node 10.31.90.204 ... ID: a6eedd58c118dcfe44a0db2af1a4f863
Adding device /dev/sdc ... OK
Creating node 10.31.90.205 ... ID: 4066962c14bcdebd28aca193b5690792
Adding device /dev/sdc ... OK
Creating node 10.31.90.206 ... ID: 91e42a2361f0266ae334354e5c34ce11
Adding device /dev/sdc ... OK- 接下来我们将使用Heketi为它配置一个卷来存储其数据库：
执行此命令后会生成一个heketi-storage.json的文件，我们最好是将此文件里的"image": "heketi/heketi:dev"
改为"image": "heketi/heketi:8"
# heketi-client/bin/heketi-cli setup-openshift-heketi-storage然后在创建heketi相关服务
# kubectl create -f heketi-storage.json陷阱：如果heketi-cli在运行setup-openshift-heketi-storage子命令时报告“无空间”错误，则可能无意中运行topology load了服务器和heketi-cli的不匹配版本。停止正在运行的Heketi pod（kubectl scale deployment deploy-heketi --replicas=0），手动从存储块设备中删除任何签名，然后继续运行Heketi pod（kubectl scale deployment deploy-heketi --replicas=1）。然后使用匹配版本的heketi-cli重新加载拓扑并重试该步骤。
- 等到作业完成然后删除引导程序Heketi：
# kubectl delete all,service,jobs,deployment,secret --selector="deploy-heketi"- 创建长期Heketi实例：
{ "kind": "List", "apiVersion": "v1", "items": [ { "kind": "Secret", "apiVersion": "v1", "metadata": { "name": "heketi-db-backup", "labels": { "glusterfs": "heketi-db", "heketi": "db" } }, "data": { }, "type": "Opaque" }, { "kind": "Service", "apiVersion": "v1", "metadata": { "name": "heketi", "labels": { "glusterfs": "heketi-service", "deploy-heketi": "support" }, "annotations": { "description": "Exposes Heketi Service" } }, "spec": { "selector": { "name": "heketi" }, "ports": [ { "name": "heketi", "port": 8080, "targetPort": 8080 } ] } }, { "kind": "Deployment", "apiVersion": "extensions/v1beta1", "metadata": { "name": "heketi", "labels": { "glusterfs": "heketi-deployment" }, "annotations": { "description": "Defines how to deploy Heketi" } }, "spec": { "replicas": 1, "template": { "metadata": { "name": "heketi", "labels": { "name": "heketi", "glusterfs": "heketi-pod" } }, "spec": { "serviceAccountName": "heketi-service-account", "containers": [ { "image": "heketi/heketi:8", "imagePullPolicy": "Always", "name": "heketi", "env": [ { "name": "HEKETI_EXECUTOR", "value": "kubernetes" }, { "name": "HEKETI_DB_PATH", "value": "/var/lib/heketi/heketi.db" }, { "name": "HEKETI_FSTAB", "value": "/var/lib/heketi/fstab" }, { "name": "HEKETI_SNAPSHOT_LIMIT", "value": "14" }, { "name": "HEKETI_KUBE_GLUSTER_DAEMONSET", "value": "y" } ], "ports": [ { "containerPort": 8080 } ], "volumeMounts": [ { "mountPath": "/backupdb", "name": "heketi-db-secret" }, { "name": "db", "mountPath": "/var/lib/heketi" }, { "name": "config", "mountPath": "/etc/heketi" } ], "readinessProbe": { "timeoutSeconds": 3, "initialDelaySeconds": 3, "httpGet": { "path": "/hello", "port": 8080 } }, "livenessProbe": { "timeoutSeconds": 3, "initialDelaySeconds": 30, "httpGet": { "path": "/hello", "port": 8080 } } } ], "volumes": [ { "name": "db", "glusterfs": { "endpoints": "heketi-storage-endpoints", "path": "heketidbstorage" } }, { "name": "heketi-db-secret", "secret": { "secretName": "heketi-db-backup" } }, { "name": "config", "secret": { "secretName": "heketi-config-secret" } } ] } } } } ] }
# kubectl create -f heketi-deployment.json
service "heketi" created
deployment "heketi" created- 现在这样做了，Heketi数据库将保留在GlusterFS卷中，并且每次重启Heketi pod时都不会重置。
使用诸如heketi-cli cluster list和之类的命令heketi-cli volume list 来确认先前建立的集群是否存在，以及Heketi是否知道在引导阶段创建的db存储卷。
演示测试
- 接下来就是建立存储卷，然后挂载测试。
在测试之前我们需要先将heketi服务通过Ingress对外发布，将heketi.cnlinux.club的A记录解析为10.31.90.200。apiVersion: extensions/v1beta1 kind: Ingress metadata: name: ingress-heketi annotations: nginx.ingress.kubernetes.io/rewrite-target: / kubernetes.io/ingress.class: nginx spec: rules: - host: heketi.cnlinux.club http: paths: - path: backend: serviceName: heketi servicePort: 8080[root@node-01 heketi]# kubectl create -f ingress-heketi.yaml在浏览器访问http://heketi.cnlinux.club/hello
- 创建StorageClass
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
name: gluster-heketi
provisioner: kubernetes.io/glusterfs
parameters:
resturl: "http://heketi.cnlinux.club"
restauthenabled: "false"
volumetype: "replicate:2"[root@node-01 heketi]# kubectl create -f storageclass-gluster-heketi.yaml
[root@node-01 heketi]# kubectl get sc
NAME PROVISIONER AGE
gluster-heketi kubernetes.io/glusterfs 10s- 创建pvc
apiVersion: v1 kind: PersistentVolumeClaim metadata: name: pvc-gluster-heketi spec: storageClassName: gluster-heketi accessModes: - ReadWriteOnce resources: requests: storage: 1Gi[root@node-01 heketi]# kubectl create -f pvc-gluster-heketi.yaml [root@node-01 heketi]# kubectl get pvc NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE pvc-gluster-heketi Bound pvc-d978f524-0b74-11e9-875c-005056826470 1Gi RWO gluster-heketi 30s - 在pod里挂载pvc
apiVersion: v1 kind: Pod metadata: name: pod-pvc spec: containers: - name: pod-pvc image: busybox:latest command: - sleep - "3600" volumeMounts: - name: gluster-volume mountPath: "/pv-data" volumes: - name: gluster-volume persistentVolumeClaim: claimName: pvc-gluster-heketi[root@node-01 heketi]# kubectl create -f pod-pvc.yaml进入容器查看是否已经挂载成功
[root@node-01 heketi]# kubectl exec pod-pvc -it /bin/sh / # df -h Filesystem Size Used Available Use% Mounted on overlay 47.8G 4.3G 43.5G 9% / tmpfs 64.0M 0 64.0M 0% /dev tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup 10.31.90.204:vol_675cc9fe0e959157919c886ea7786d33 1014.0M 42.7M 971.3M 4% /pv-data /dev/sda3 47.8G 4.3G 43.5G 9% /dev/termination-log /dev/sda3 47.8G 4.3G 43.5G 9% /etc/resolv.conf /dev/sda3 47.8G 4.3G 43.5G 9% /etc/hostname /dev/sda3 47.8G 4.3G 43.5G 9% /etc/hosts#往/pv-data写文件，当容量超过1G时就自动退出了，证明容量限制是生效的。
/ # cd /pv-data/ /pv-data # dd if=/dev/zero of=/pv-data/test.img bs=8M count=300 123+0 records in 122+0 records out 1030225920 bytes (982.5MB) copied, 24.255925 seconds, 40.5MB/s在宿主机磁盘里查看是否创建了test.img文件
[root@node-04 cfg]# mount /dev/vg_2631413b8b87bbd6cb526568ab697d37/brick_1691ef862dd504e12e8384af76e5a9f2 /mnt [root@node-04 cfg]# ll -h /mnt/brick/ total 982M -rw-r--r-- 2 root 2001 982M Jan 2 15:14 test.img至此，所有的操作都已完成。
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