如何使用Rancher在Kubernetes上部署EMQX集群
这篇文章主要讲解了“如何使用Rancher在Kubernetes上部署EMQ X集群”，文中的讲解内容简单清晰，易于学习与理解，下面请大家跟着小编的思路慢慢深入，一起来研究和学习“如何使用Rancher在Kubernetes上部署EMQ X集群”吧！
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实验环境：
公有云环境：AWS EC2
操作系统：ubuntu 16.04
Docker version：18.09.0
通过Rancher部署kubernetes集群
Rancher的安装以及部署kubernetes集群的步骤推荐直接按照快速入门执行。
创建Rancher Api密钥
EMQ X通过访问kube-apiserver来实现自动集群功能，在Rancher中，Rancher对kube-apiserver做了一层代理，在访问kube-apiserver的时候必须提供用于向Rancher进行身份验证的API密钥。参考用户手册创建并保存API Key。本实验中创建的Access Key为：token-dksbl，Secret Key为：pshhhf5cp8d5v5x7bzjdm82qfrwgx7f2bzksnr748j42xmbvvklbdz，组合成的Token为：token-dksbl:pshhhf5cp8d5v5x7bzjdm82qfrwgx7f2bzksnr748j42xmbvvklbdz
下载并配置kubectl
下载并安装kubectl
进入Rancher集群页面，点击Kubeconfig文件。
将kubeconfig文件保存到~/.kube/config
执行kubectl cluster-info验证配置是否成功
$ kubectl cluster-infoKubernetes master is running at https://13.125.244.172/k8s/clusters/c-vvgjq KubeDNS is running at https://13.125.244.172/k8s/clusters/c-vvgjq/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.
访问kube-apiserver
EMQ X通过访问kube-apiserver来实现自动集群，kube-apiserver的地址可以查看~/.ssh/config文件或者执行kubectl cluster-info获取，本实验中kube-apiserver的地址为：https://13.125.244.172/k8s/clusters/c-vvgjq。
直接访问kube-apiserver，可以看到会报错需要认证。
$ curl -k https://13.125.244.172/k8s/clusters/c-vvgjq{"type":"error","status":"401","message":"must authenticate"}在头部加上Authorization认证则可以正常访问
$ curl -k -H 'Authorization: Bearer token-dksbl:pshhhf5cp8d5v5x7bzjdm82qfrwgx7f2bzksnr748j42xmbvvklbdz' https://13.125.244.172/k8s/clusters/c-vvgjq
编辑emqx.yaml
在Kubernetes 上安装 EMQ X 系列文章之二 ：EMQ X 自动集群一文中分享了EMQ X部署kubernetes集群的yaml文件如下，在Rancher上部署EMQ X集群的话需要稍加改动。
$cat emqx.yaml apiVersion: v1 kind: Service metadata: name: emqx spec: ports: - port: 32333 nodePort: 32333 targetPort: emqx-dashboard protocol: TCP selector: app: emqx type: NodePort --- apiVersion: extensions/v1beta1 kind: Deployment metadata: name: emqx labels: app: emqx spec: replicas: 2 template: metadata: labels: app: emqx spec: containers: - name: emqx image: emqx/emqx:latest ports: - name: emqx-dashboard containerPort: 18083 env: - name: EMQX_CLUSTER__DISCOVERY value: k8s - name: EMQX_NAME value: emqx - name: EMQX_CLUSTER__K8S__APISERVER value: http://172.31.19.161:8080 - name: EMQX_CLUSTER__K8S__NAMESPACE value: default - name: EMQX_CLUSTER__K8S__SERVICE_NAME value: emqx - name: EMQX_CLUSTER__K8S__ADDRESS_TYPE value: ip - name: EMQX_CLUSTER__K8S__APP_NAME value: emqx tty: true
EMQ X可以读取/var/run/secrets/kubernetes.io/serviceaccount/token文件中的内容组合Authorization认证访问kube-apiserver，所以只需要把Rancher的API Token通过Secret挂载到容器中就可以了。
Secret解决了密码、token、密钥等敏感数据的配置问题，而不需要把这些敏感数据暴露到镜像或者Pod Spec中。Secret可以以Volume或者环境变量的方式使用。
Secret有三种类型：
Service Account：用来访问Kubernetes API，由Kubernetes自动创建，并且会自动挂载到Pod的
/run/secrets/kubernetes.io/serviceaccount目录中；Opaque：base64编码格式的Secret，用来存储密码、密钥等；
kubernetes.io/dockerconfigjson：用来存储私有docker registry的认证信息。
首先对API Token做base64编码
$ echo -n token-dksbl:pshhhf5cp8d5v5x7bzjdm82qfrwgx7f2bzksnr748j42xmbvvklbdz | base64 -w 0dG9rZW4tZGtzYmw6cHNoaGhmNWNwOGQ1djV4N2J6amRtODJxZnJ3Z3g3ZjJiemtzbnI3NDhqNDJ4bWJ2dmtsYmR6
在yaml文件中创建Secret
$vim emqx.yamlapiVersion: v1 kind: Secret metadata: name: emqx-secret type: Opaque data: token: dG9rZW4tcGI2MjU6eDZ2eGJ0Y2NmdG1waGpseHR3NGNjdGN2d2txdzk5aDJzYmhxNHFtaDh5c2ZnbXd6dzJ0d2Rw --- ......
修改Deployment，将环境变量中的EMQX_CLUSTER__K8S__APISERVER改为Rancher的Kube-apiserver的地址，增加volumeMounts
$vim emqx.yaml...... apiVersion: extensions/v1beta1 kind: Deployment metadata: name: emqx labels: app: emqx spec: replicas: 2 template: metadata: labels: app: emqx spec: volumes: - name: emqx-secret secret: secretName: emqx-secret containers: - name: emqx image: emqx/emqx:latest ports: - name: emqx-dashboard containerPort: 18083 - name: emqx-http containerPort: 8083 - name: emqx-mqtt containerPort: 1883 env: - name: EMQX_CLUSTER__DISCOVERY value: k8s - name: EMQX_NAME value: emqx - name: EMQX_CLUSTER__K8S__APISERVER value: https://13.125.244.172/k8s/clusters/c-vvgjq - name: EMQX_CLUSTER__K8S__NAMESPACE value: default - name: EMQX_CLUSTER__K8S__SERVICE_NAME value: emqx - name: EMQX_CLUSTER__K8S__ADDRESS_TYPE value: ip - name: EMQX_CLUSTER__K8S__APP_NAME value: emqx tty: true volumeMounts: - name: emqx-secret mountPath: "/var/run/secrets/kubernetes.io/serviceaccount" readOnly: true
部署EMQ X
查看修改后的emqx.yaml
$cat emqx.yamlapiVersion: v1 kind: Secret metadata: name: emqx-secret type: Opaque data: token: dG9rZW4tcGI2MjU6eDZ2eGJ0Y2NmdG1waGpseHR3NGNjdGN2d2txdzk5aDJzYmhxNHFtaDh5c2ZnbXd6dzJ0d2Rw --- apiVersion: v1 kind: Service metadata: name: emqx spec: ports: - port: 32333 nodePort: 32333 targetPort: emqx-dashboard protocol: TCP selector: app: emqx type: NodePort --- apiVersion: extensions/v1beta1 kind: Deployment metadata: name: emqx labels: app: emqx spec: replicas: 2 template: metadata: labels: app: emqx spec: volumes: - name: emqx-secret secret: secretName: emqx-secret containers: - name: emqx image: emqx/emqx:latest ports: - name: emqx-dashboard containerPort: 18083 - name: emqx-http containerPort: 8083 - name: emqx-mqtt containerPort: 1883 env: - name: EMQX_CLUSTER__DISCOVERY value: k8s - name: EMQX_NAME value: emqx - name: EMQX_CLUSTER__K8S__APISERVER value: https://13.125.244.172/k8s/clusters/c-vvgjq - name: EMQX_CLUSTER__K8S__NAMESPACE value: default - name: EMQX_CLUSTER__K8S__SERVICE_NAME value: emqx - name: EMQX_CLUSTER__K8S__ADDRESS_TYPE value: ip - name: EMQX_CLUSTER__K8S__APP_NAME value: emqx tty: true volumeMounts: - name: emqx-secret mountPath: "/var/run/secrets/kubernetes.io/serviceaccount" readOnly: true
部署EMQ X
$ kubectl create -f emqx.yamlsecret/emqx-secret created service/emqx created deployment.extensions/emqx created
查看状态
$ kubectl get podsNAME READY STATUS RESTARTS AGE emqx-67b5fcf4d-gwzfn 1/1 Running 0 36s emqx-67b5fcf4d-rb7m6 1/1 Running 0 36s
集群成功
$ kubectl exec emqx-67b5fcf4d-gwzfn /opt/emqx/bin/emqx_ctl cluster statusCluster status: [{running_nodes,['emqx@10.42.1.24','emqx@10.42.2.19']}]使用Rancher Dashboard部署EMQ X（可选）
删除刚刚部署的EMQ X
$ kubectl delete -f emqx.yamlsecret "emqx-secret" deleted service "emqx" deleted deployment.extensions "emqx" deleted
进入Rancher集群工作负载页面，点击导入YAML
在导入页面将emqx.yaml文件的内容复制进去!
点击导入，等待导入成功。
感谢各位的阅读，以上就是“如何使用Rancher在Kubernetes上部署EMQ X集群”的内容了，经过本文的学习后，相信大家对如何使用Rancher在Kubernetes上部署EMQ X集群这一问题有了更深刻的体会，具体使用情况还需要大家实践验证。这里是创新互联，小编将为大家推送更多相关知识点的文章，欢迎关注！
本文名称：如何使用Rancher在Kubernetes上部署EMQX集群
文章来源：http://scyanting.com/article/ihpcoh.html
