jenkins X实践系列（2） —— 基于jx的DevOps实践

jx是云原生CICD，devops的一个最佳实践之一，目前在快速的发展成熟中。最近调研了JX，这里为第2篇，使用已经安装好的jx来实践CICD，旨在让大家了解基于jx的DevOps是如何运转的，感兴趣的可以继续关注，下一篇介绍如何安装。

先上图：

一、windows 搭建开发环境（可选）

1. 安装kubectl

使用Chocolatey来安装，因此install Chocolatey：

安装Chocolatey

windows + X ，选择power shell 管理员模式，输入：

Set-ExecutionPolicy Bypass -Scope Process -Force; iex ((New-Object System.Net.WebClient).DownloadString('https://chocolatey.org/install.ps1'))

或者cmd.exe（管理员）：

@"%SystemRoot%\System32\WindowsPowerShell\v1.0\powershell.exe" -NoProfile -InputFormat None -ExecutionPolicy Bypass -Command "iex ((New-Object System.Net.WebClient).DownloadString('https://chocolatey.org/install.ps1'))" && SET "PATH=%PATH%;%ALLUSERSPROFILE%\chocolatey\bin"

使用Chocolatey安装kubectl

使用脚本安装
```
choco install kubernetes-cli
```
测试是否安装成功:
```
kubectl version
```
创建配置文件，先转到%HOME% 目录:

For example: cd C:\users\yourusername
创建配置文件目录:
```
mkdir .kube
```
转到配置目录:
```
cd .kube
```
配置kubectl使用远程集群:
```
New-Item config -type file
```

修改config文件，或者直接从集群拷贝配置文件过来

测试

C:\Users\jqpeng>kubectl get pods

NAME                                                READY   STATUS      RESTARTS   AGE

jenkins-bd94b5fb8-5t9kq                             1/1     Running     0          10d

jenkins-x-chartmuseum-75d45b6d7f-2hk99              1/1     Running     0          10d

jenkins-x-controllercommitstatus-675dbb9c86-kth6q   1/1     Running     71         10d

jenkins-x-controllerrole-5458874c-4lnwh             1/1     Running     0          10d

jenkins-x-controllerteam-7f965c8b9c-n4kfm           1/1     Running     0          10d

jenkins-x-controllerworkflow-7675c458d-sjbfd        1/1     Running     0          10d

2.安装helm

到下载页：

https://github.com/helm/helm/releases

下载最新的helm,选择windows-amd64

wget https://storage.googleapis.com/kubernetes-helm/helm-v2.11.0-windows-amd64.zip

解压后，拷贝到C:\Windows\System32。

注意，需要Cross GFW,可以使用（ https://azure.microsoft.com/zh-cn/free/ ）免费一年。

初始化helm

服务端已经安装过tiller了，因此只需要client-only，另外stable repo指定本地的

helm init --client-only --stable-repo-url=http://charts.youdomain.com/

---

Creating C:\Users\jqpeng\.helm

Creating C:\Users\jqpeng\.helm\repository

Creating C:\Users\jqpeng\.helm\repository\cache

Creating C:\Users\jqpeng\.helm\repository\local

Creating C:\Users\jqpeng\.helm\plugins

Creating C:\Users\jqpeng\.helm\starters

Creating C:\Users\jqpeng\.helm\cache\archive

Creating C:\Users\jqpeng\.helm\repository\repositories.yaml

Adding stable repo with URL: http://charts.youdomain.com/

Adding local repo with URL: http://127.0.0.1:8879/charts

$HELM_HOME has been configured at C:\Users\jqpeng\.helm.

Not installing Tiller due to 'client-only' flag having been set

Happy Helming!

3. 安装jx

到https://github.com/jenkins-x/jx/releases 下载最新的编译好的jx执行文件，选择jx-windows-amd64.zip下载，下载后解压，然后重新命名为jx.exe，拷贝到C:\Windows\System32。

测试:

C:\Users\jqpeng>jx version

Updated the team settings in namespace incubation

Updated the team settings in namespace incubation

NAME               VERSION

jx                 [32m1.3.572[0m

jenkins x platform [32m0.0.2871[0m

Kubernetes cluster [32mv1.12.2[0m

kubectl            [32mv1.12.1[0m

helm client        [32mv2.11.0+g2e55dbe[0m

helm server        [32mv2.11.0+g2e55dbe[0m

git                [32mgit version 2.19.1.windows.1[0m

将服务器上的.jx目录下相关配置信息下载到本地用户目录下的.jx文件夹。

二、快速开始

1.使用quickstart

作为演示用，可以直接使用jx create quickstart,会直接使用官方的quickstart项目，键入命令，然后按提示选择即可。

D:\Project>jx create quickstart

? select the quickstart you wish to create spring-boot-rest-prometheus

? Project name spring-boot-rest-prometheus

Generated quickstart at D:\Project\spring-boot-rest-prometheus

### NO charts folder D:\Project\spring-boot-rest-prometheus\charts\spring-boot-rest-prometheus

Created project at D:\Project\spring-boot-rest-prometheus

Updated the team settings in namespace incubation

? Which Git service do you wish to use https://github.com

No username defined for the current Git server!

? Do you wish to use jadepeng as the Git user name: Yes

The directory D:\Project\spring-boot-rest-prometheus is not yet using git

? Would you like to initialise git now? Yes

? Commit message:  Initial import

Git repository created

Updated the team settings in namespace incubation

selected pack: C:\Users\jqpeng\.jx\draft\packs\github.com\jenkins-x\draft-packs\packs\maven

? Which organisation do you want to use? jadepeng

replacing placeholders in directory D:\Project\spring-boot-rest-prometheus

app name: spring-boot-rest-prometheus, git server: github.com, org: jadepeng, Docker registry org: jadepeng

skipping directory "D:\\Project\\spring-boot-rest-prometheus\\.git"

Using Git provider [32mgithub.com at https://github.com[0m

About to create repository [32mspring-boot-rest-prometheus[0m on server [32mhttps://github.com[0m with user [32mjadepeng[0m

? Enter the new repository name:  spring-boot-rest-prometheus

Creating repository [32mjadepeng/spring-boot-rest-prometheus[0m

Pushed Git repository to https://github.com/jadepeng/spring-boot-rest-prometheus

Updated the team settings in namespace incubation

? Do you wish to use jadepeng as the user name for the Jenkins Pipeline Yes

Created Jenkins Project: http://jenkins.incubation.youdomain.com/job/jadepeng/job/spring-boot-rest-prometheus/

Watch pipeline activity via:    jx get activity -f spring-boot-rest-prometheus -w

Browse the pipeline log via:    jx get build logs jadepeng/spring-boot-rest-prometheus/master

Open the Jenkins console via    jx console

You can list the pipelines via: jx get pipelines

When the pipeline is complete:  jx get applications

For more help on available commands see: https://jenkins-x.io/developing/browsing/

Note that your first pipeline may take a few minutes to start while the necessary images get downloaded!

Creating GitHub webhook for jadepeng/spring-boot-rest-prometheus for url http://jenkins.incubation.youdomain.com/github-webhook/

创建过程：

自动创建了spring-boot-rest-prometheus项目，并提交到github（可以使用自己的git服务器），并自动创建GitHub webhook ，这样当新代码提交到github后，会自动触发构建。
将项目提交到jenkins，可以打开http://jenkins.incubation.youdomain.com/job/jadepeng/job/spring-boot-rest-prometheus/ 查看
jenkins会自动进行构建，可以通过jx get activity -f spring-boot-rest-prometheus -w查看构建活动
通过jx get build logs jadepeng/spring-boot-rest-prometheus/master查看构建日志,
通过jx console打开jenkins bule

2.查看构建日志

我们查看构建日志：

jx get build logs jadepeng/spring-boot-rest-prometheus/master

....

+ jx step helm release

No $CHART_REPOSITORY defined so using the default value of: http://jenkins-x-chartmuseum:8080

Using helmBinary helm with feature flag: none

Adding missing Helm repo: jenkins-x http://chartmuseum.jenkins-x.io

Successfully added Helm repository jenkins-x.

Adding missing Helm repo: releases http://jenkins-x-chartmuseum:8080

Successfully added Helm repository releases.

No $CHART_REPOSITORY defined so using the default value of: http://jenkins-x-chartmuseum:8080

Uploading chart file spring-boot-rest-prometheus-0.0.1.tgz to http://jenkins-x-chartmuseum:8080/api/charts

Received 201 response: {"saved":true}

[Pipeline] sh

[spring-boot-rest-prometheus] Running shell script

++ cat ../../VERSION

+ jx promote -b --all-auto --timeout 1h --version 0.0.1

Using helmBinary helm with feature flag: none

Promoting app spring-boot-rest-prometheus version 0.0.1 to namespace incubation-staging

Created Pull Request: http://github.youdomain.com/jqpeng/environment-walkertabby-staging/pulls/34

3.部署到staging环境

可以看到已经构建成功，并停留在最后一步jx promote -b --all-auto --timeout 1h --version 0.0.1

jx promote 是jx的发布命令，将构建产物部署到k8s环境。回顾下文章开始的一个图，提交到master后的代码，自动构建后会部署到staging，由于采用的gitops，会往staging环境的git仓库 environment-walkertabby-staging推送一个pullrequest：

environment-walkertabby-staging其实就是一个charts项目：

每提交一个pullrequest，其实就是在requirements.yaml，将需要部署的项目作为-staging环境的依赖，比如刚提交的pullrequest就是增加了spring-boot-rest-prometheus依赖。

@@ -13,6 +13,9 @@ dependencies:

+

 - name: pailitaoservice

+

   repository: http://jenkins-x-chartmuseum:8080

+

   version: 0.0.3

+

+- name: spring-boot-rest-prometheus

+

+  repository: http://jenkins-x-chartmuseum:8080

+

+  version: 0.0.1

+

 - name: springboot-rest-demo

+

   repository: http://jenkins-x-chartmuseum:8080

+

   version: 0.0.4

我们来同意下合并pullrequest，这样当staging项目构建后就会自动部署spring-boot-rest-prometheus。合并完成后，再回到日志查看：

...

+ jx promote -b --all-auto --timeout 1h --version 0.0.1

Using helmBinary helm with feature flag: none

Promoting app spring-boot-rest-prometheus version 0.0.1 to namespace incubation-staging

Created Pull Request: http://github.youdomain.com/jqpeng/environment-walkertabby-staging/pulls/34

Pull Request http://github.youdomain.com/jqpeng/environment-walkertabby-staging/pulls/34 is merged at sha 906a33b6eec14a49d248d8220e0d88416798ba6e

merge status: pending for URL http://github.youdomain.com/api/v1/jqpeng/environment-walkertabby-staging/statuses/906a33b6eec14a49d248d8220e0d88416798ba6e with target: http://jenkins.incubation.youdomain.com/job/jqpeng/job/environment-walkertabby-staging/job/master/display/redirect description: Build queued...

merge status: success for URL http://github.youdomain.com/api/v1/jqpeng/environment-walkertabby-staging/statuses/906a33b6eec14a49d248d8220e0d88416798ba6e with target: http://jenkins.incubation.youdomain.com/job/jqpeng/job/environment-walkertabby-staging/job/master/3/display/redirect description: This commit looks good

Merge status checks all passed so the promotion worked!

[Pipeline] }

[Pipeline] // container

[Pipeline] }

[Pipeline] // dir

[Pipeline] }

[Pipeline] // stage

[Pipeline] stage

[Pipeline] { (Declarative: Post Actions)

[Pipeline] cleanWs

[WS-CLEANUP] Deleting project workspace...[WS-CLEANUP] done

[Pipeline] }

[Pipeline] // stage

[Pipeline] }

[Pipeline] // withEnv

[Pipeline] }

[Pipeline] // withCredentials

[Pipeline] }

[Pipeline] // withEnv

[Pipeline] }

[Pipeline] // node

[Pipeline] End of Pipeline

jx已经检测到Pull Request已经通过，并且启动staging构建，直到构建结束。

这个时候，我们就可以通过jx get applications来查看部署好的应用。

D:\Project>jx get applications

APPLICATION                 EDIT PODS URL STAGING PODS URL                                                                    PRODUCTION PODS URL

spring-boot-rest-prometheus               0.0.1        http://spring-boot-rest-prometheus.incubation-staging.youdomain.com

PODS 为0，应该是容器启动有问题，我们可以看下：

kubectl -n=incubation-staging describe pod incubation-staging-spring-boot-rest-prometheus-66966b8cbb-8fvmf

---

Events:

  Type     Reason     Age                    From                 Message

  ----     ------     ----                   ----                 -------

  Normal   Scheduled  6m51s                  default-scheduler    Successfully assigned incubation-staging/incubation-staging-spring-boot-rest-prometheus-66966b8cbb-8fvmf to docker86-9

  Normal   Pulling    6m44s                  kubelet, docker86-9  pulling image "registry.youdomain.com/jadepeng/spring-boot-rest-prometheus:0.0.1"

  Normal   Pulled     6m38s                  kubelet, docker86-9  Successfully pulled image "registry.youdomain.com/jadepeng/spring-boot-rest-prometheus:0.0.1"

  Normal   Created    5m27s (x3 over 6m37s)  kubelet, docker86-9  Created container

  Normal   Started    5m27s (x3 over 6m37s)  kubelet, docker86-9  Started container

  Warning  Unhealthy  5m1s (x9 over 6m31s)   kubelet, docker86-9  Readiness probe failed: Get http://170.22.78.7:8080/actuator/health: dial tcp 170.22.78.7:8080: connect: connection refused

  Normal   Pulled     4m26s (x3 over 6m10s)  kubelet, docker86-9  Container image "registry.youdomain.com/jadepeng/spring-boot-rest-prometheus:0.0.1" already present on machine

  Warning  BackOff    97s (x15 over 5m41s)   kubelet, docker86-9  Back-off restarting failed container

问题在于Readiness probe failed, 来查看下容器日志：

kubectl -n=incubation-staging logs incubation-staging-spring-boot-rest-prometheus-66966b8cbb-8fvmf

  .   ____          _            __ _ _

 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \

( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \

 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )

  '  |____| .__|_| |_|_| |_\__, | / / / /

 =========|_|==============|___/=/_/_/_/

 :: Spring Boot ::        (v2.0.4.RELEASE)

2018-11-20 03:39:45.149  INFO 1 --- [           main] c.g.j.q.s.r.p.RestPrometheusApplication  : Starting RestPrometheusApplication v0.0.1 on incubation-staging-spring-boot-rest-prometheus-66966b8cbb-8fvmf with PID 1 (/opt/app.jar started by root in /opt)

2018-11-20 03:39:45.442  INFO 1 --- [           main] c.g.j.q.s.r.p.RestPrometheusApplication  : No active profile set, falling back to default profiles: default

2018-11-20 03:39:47.942  INFO 1 --- [           main] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@424c0bc4: startup date [Tue Nov 20 03:39:47 UTC 2018]; root of context hierarchy

原来java程序还没有启动成功，有可能是默认的资源限制问题，我们去掉相关限制，修改deployment.yaml，删除resources限制：

git push到仓库，等待自动构建完成，再次查看：

D:\Project>jx get applications

APPLICATION                 EDIT PODS URL STAGING PODS URL                                                                    PRODUCTION PODS URL

spring-boot-rest-prometheus               0.0.2   1/1  http://spring-boot-rest-prometheus.incubation-staging.youdomain.com 

D:\Project>curl -l http://spring-boot-rest-prometheus.incubation-staging.youdomain.com/

{"hello":"world"}

可以看到，自动构建了0.0.2版本，并且已经部署成功

4. 部署到正式环境

如果在staging测试没有问题，可以推送到正式环境（production）

jx promote spring-boot-rest-prometheus  --version 0.0.2 --env production

该命令会往production环境发送一个pullrequest，同意后会部署到正式环境。

jx promote spring-boot-rest-prometheus  --version 0.0.2 --env production

Promoting app spring-boot-rest-prometheus version 0.0.2 to namespace incubation-production

? Do you wish to use jqpeng as the user name to submit the Pull Request Yes

Created Pull Request: http://github.youdomain.com/jqpeng/environment-walkertabby-production/pulls/2

pipeline jqpeng/environment-jx-dev/master

Pull Request http://github.youdomain.com/jqpeng/environment-walkertabby-production/pulls/2 is merged at sha 1f2ab843a8037f353020a81ad4289c9ede550447

merge status: pending for URL http://github.youdomain.com/api/v1/jqpeng/environment-walkertabby-production/statuses/1f2ab843a8037f353020a81ad4289c9ede550447 with target: http://jenkins.incubation.youdomain.com/job/jqpeng/job/environment-walkertabby-production/job/master/display/redirect description: Build queued...

然后再jx get applications

jx get applications

APPLICATION                 EDIT PODS URL STAGING PODS URL                                                                    PRODUCTION PODS URL

spring-boot-rest-prometheus               0.0.2   1/1  http://spring-boot-rest-prometheus.incubation-staging.youdomain.com 0.0.2      1/1  http://spring-boot-rest-prometheus.incubation-production.youdomain.com

可以看到0.0.2已经在PRODUCTIONS环境了，测试一下：

curl -l http://spring-boot-rest-prometheus.incubation-production.youdomain.com

{"hello":"world"}

三、为项目增加新功能

gitops提倡增加新功能，先在新的分支测试通过后，然后提交PR到master分支，因此我们先创建一个新分支jqpeng-dev。

git checkout -b jqpeng-dev

Switched to a new branch 'jqpeng-dev'

hello jx

修改RestPrometheusApplication.java

@GetMapping(path = "/", produces = "application/json")

	@ResponseBody

	public Map<String, Object> landingPage() {

		Counter.builder("mymetric").tag("foo", "bar").register(registry).increment();

        return singletonMap("hello", "world");

	}

修改为

@GetMapping(path = "/", produces = "application/json")

	@ResponseBody

	public Map<String, Object> landingPage() {

		Counter.builder("mymetric").tag("foo", "bar").register(registry).increment();

        return singletonMap("hello", "jx");

	}

保存，提交

git commit -a -m ''

git push origin jqpeng-dev

提交一个PR：

jx create pullrequest -t "#pr1 hello jx"

? Do you wish to use jadepeng as the user name to use for authenticating with git issues Yes

Created PullRequest #1 at https://github.com/jadepeng/spring-boot-rest-prometheus/pull/1

可以到https://github.com/jadepeng/spring-boot-rest-prometheus/pull/1/files查看代码变更。

提交PR后，jx会自动构建PR，并部署preview环境，可以打开jenkins查看：

或者通过命令查看：

jx get build log jadepeng/spring-boot-rest-prometheus/PR-1

等自动构建完成，jx会在pr下面提交一个带预览地址的评论：

点看链接查看：

已经是hello jx了！

合并PR

打开PR页面，点击Merge pull request：

填写合并日志，提交：

PR1已经合并到master分支，等待自动构建完成，剩下的就和上面“二、快速开始”里的一样了，在staging环境进行测试，没问题的发布到生产环境。

四、小结

jx 良好的实现了gitops，利于团队协作，可以在团队进行推广实施。

作者：Jadepeng

出处：jqpeng的技术记事本--http://www.cnblogs.com/xiaoqi

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