工作日志——k8s gitRepo volume

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gitRepo volume可以理解为是emptyDir volume的一种实际应用，使用该volume的Pod可以在挂载目录访问指定的代码仓库。这里与大家分享一下gitRepo的使用。

gitRepo volume 简介

gitRepo volume会挂载到一个空目录中，并clone一份指定的git代码到该目录中。
gitRepo volume的生命周期与pod同步。
clone操作会先于pod创建操作。也就是说pod创建后，代码已在挂载的目录中。

volume spec 示例

gitRepo volume spec参考这里

volumes:  - name: git-volume    gitRepo:      repository: "git@somewhere:me/my-git-repository.git"      revision: "22f1d8406d464b0c0874075539c1f2e96c253775"

使用示例

创建foo.yaml，内容如下：

apiVersion: v1kind: Servicemetadata:  name: foospec:  type: NodePort  ports:  - port: 8080    targetPort: 8080    nodePort: 38080  selector:     name: foo---apiVersion: v1kind: Podmetadata:  name: foo  labels:    name: foospec:  containers:  - image: index.tenxcloud.com/tenxcloud/golang    name: foo    command: ["go", "run", "goweb.go"]    workingDir: "/home/foo/golang-sample"    volumeMounts:    - mountPath: /home/foo      name: git-volume  volumes:  - name: git-volume    gitRepo:      repository: "https://github.com/tenxcloud/golang-sample.git"      revision: "master"

启动示例：

$ kubectl create -f foo.yaml You have exposed your service on an external port on all nodes in yourcluster.  If you want to expose this service to the external internet, you mayneed to set up firewall rules for the service port(s) (tcp:38080) to serve traffic.See http://releases.k8s.io/release-1.2/docs/user-guide/services-firewalls.md for more details.service "foo" createdpod "foo" created

该配置文件将创建一个名为foo的pod，并使用一个gitRepo volume。Pod启动后可以在/home/foo目录中看到git仓库https://github.com/tenxcloud/golang-sample.git。

command指定了执行“go run goweb.go”，该指令会启动一个简易的web服务（8080端口）。配置文件设置了一个Service，通过NodePort方式将该服务暴露在38080端口。通过浏览器访问k8s集群任意可用节点的38080端口可以访问该服务。
demo

注意事项

如未在各k8s node中设置私钥，则只能指定HTTPS类型的Repository URL。否则pod创建将失败：

Events:  FirstSeen LastSeen    Count   From            SubobjectPath   Type        Reason      Message  --------- --------    -----   ----            -------------   --------    ------      -------  7s        7s      1   {default-scheduler }            Normal      Scheduled   Successfully assigned foo to 192.168.1.82  <invalid> <invalid>   1   {kubelet 192.168.1.82}          Warning     FailedMount Unable to mount volumes for pod "foo_default(25b2583b-1b1a-11e6-8368-005056852444)": failed to exec 'git clone git@github.com:tenxcloud/golang-sample.git': Cloning into 'golang-sample'...Host key verification failed.fatal: Could not read from remote repository.Please make sure you have the correct access rightsand the repository exists.: exit status 128  <invalid> <invalid>   1   {kubelet 192.168.1.82}      Warning FailedSync  Error syncing pod, skipping: failed to exec 'git clone git@github.com:tenxcloud/golang-sample.git': Cloning into 'golang-sample'...Host key verification failed.fatal: Could not read from remote repository.Please make sure you have the correct access rightsand the repository exists.: exit status 128

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