很早之前寫過一篇jenkins集成docker的文章，使用的是CloudBees Docker Build and Publish plugin插件。這篇文章是直接使用shell腳本做的，主要是這次有一個需求是檢測harbor倉庫裏面是否已經存在要構建的鏡像，如果存在就放棄構建，如果不存在則構建鏡像並上傳到harbor倉庫，我這裏是通過請求harbor的api來檢測的。

整個過程大致分為四個步驟，畫了一個簡單圖：

1、在jenkins上構建一個自由風格的軟件項目。

2、源碼管理使用git。

這裏的賬號是gitlab上的賬號。

3、構建觸發器，我這裏使用的是Poll SCM定時檢測，即每隔一段時間檢測一次代碼是否有更新。

4、添加構建步驟。

這個過程是這樣：

• 讀取自定義tag，並賦值給一個變量。
• 檢測harbor倉庫上是否有該鏡像。如果沒有則構建鏡像並上傳到harbor，如果有則退出。
• 通用ssh發布到kubernetes。

需要單獨說一下的是，我這裏需要使用自定義tag，我使用一個插件Environment Injector Plugin將這個變量變成jenkins環境變量，讓其能在jenkins上調用。

另外，在遠程機器上ssh執行命令需要添加授權。系統設置 -> SSH remote hosts

這裏的賬號是ssh連接的遠程主機的用戶和私鑰（或者賬號和密碼）。

5、到這裏整個過程基本完成了，進入項目，嘗試構建。

控制臺輸出，由於太長我就直接貼文字了：

Started by user shengyongp
[EnvInject] - Loading node environment variables.
Building in workspace /var/lib/tomcat8/.jenkins/workspace/k8sdesktop
 > git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
 > git config remote.origin.url [email protected]:sa/k8sdesktop.git # timeout=10
Fetching upstream changes from [email protected]:sa/k8sdesktop.git
 > git --version # timeout=10
using GIT_ASKPASS to set credentials 
 > git fetch --tags --progress [email protected]:sa/k8sdesktop.git +refs/heads/*:refs/remotes/origin/*
 > git rev-parse refs/remotes/origin/master^{commit} # timeout=10
 > git rev-parse refs/remotes/origin/origin/master^{commit} # timeout=10
Checking out Revision 7593b720066259d291a31a8eb25121c260dd6e00 (refs/remotes/origin/master)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f 7593b720066259d291a31a8eb25121c260dd6e00
Commit message: "update"
 > git rev-list --no-walk 7593b720066259d291a31a8eb25121c260dd6e00 # timeout=10
[k8sdesktop] $ /bin/sh -xe /tmp/tomcat8-tomcat8-tmp/jenkins6696265847877639661.sh
+ cat last_tag
+ LAST_TAG=0.0.5
+ echo LAST_TAG=0.0.5
+ curl -i -s -k https://harbor.oupeng.com/api/repositories/k8sdesktop%2Fk8sdesktop/tags/0.0.5
+ awk {print $2}
+ head -1
+ is_exsist=404
+ [ 404 -ne 200 ]
+ echo Image not exsist, prepare to build it.
Image not exsist, prepare to build it.
+ docker build -t harbor.oupeng.com/k8sdesktop/k8sdesktop:0.0.5 .
Sending build context to Docker daemon  60.25MB

Step 1/10 : FROM alpine:3.7
 ---> 3fd9065eaf02
Step 2/10 : MAINTAINER "weiduan"
 ---> Using cache
 ---> d7053b014ba5
Step 3/10 : RUN rm /etc/apk/repositories
 ---> Using cache
 ---> a73bff2a847a
Step 4/10 : ADD /sources/repositories /etc/apk/repositories
 ---> Using cache
 ---> dfbb18dfbfbd
Step 5/10 : RUN apk add --no-cache python3 supervisor nginx python3-dev build-base linux-headers pcre-dev openldap-dev     && pip3 install --no-cache-dir uwsgi django django-auth-ldap PyMySQL
 ---> Using cache
 ---> 9b318af7da67
Step 6/10 : ADD sources/ /data
 ---> Using cache
 ---> 600dcbcc0935
Step 7/10 : WORKDIR /data
 ---> Using cache
 ---> 4b4b2687ac2f
Step 8/10 : RUN ln -s /usr/lib/python3.6/site-packages/django/contrib/admin/static/admin /data/k8sdesktop/static/     && rm -f /etc/nginx/nginx.conf /etc/supervisord.conf /usr/bin/python     && mkdir -p /etc/nginx/sites-enabled /var/log/uwsgi /run/nginx     && ln -s /usr/bin/python3 /usr/bin/python     && ln -s /data/supervisord.conf /etc/     && ln -s /data/nginx.conf /etc/nginx/     && ln -s /data/k8sdesktop.conf /etc/nginx/sites-enabled/
 ---> Using cache
 ---> 4f3f962c0635
Step 9/10 : EXPOSE 80
 ---> Using cache
 ---> 2604a91e376d
Step 10/10 : ENTRYPOINT ["supervisord", "-n"]
 ---> Using cache
 ---> dde892e6136a
Successfully built dde892e6136a
Successfully tagged harbor.oupeng.com/k8sdesktop/k8sdesktop:0.0.5
+ echo Push the image to Harbor.
Push the image to Harbor.
+ docker push harbor.oupeng.com/k8sdesktop/k8sdesktop:0.0.5
The push refers to repository [harbor.oupeng.com/k8sdesktop/k8sdesktop]
950915917e6f: Preparing
7d26b9ed8228: Preparing
82a138967623: Preparing
ba67b311ae84: Preparing
68b0d545b5ec: Preparing
cd7100a72410: Preparing
cd7100a72410: Waiting
68b0d545b5ec: Layer already exists
cd7100a72410: Layer already exists
950915917e6f: Pushed
ba67b311ae84: Pushed
7d26b9ed8228: Pushed
82a138967623: Pushed
0.0.5: digest: sha256:43efbc46adef6eb7644ebaa7fe2c46dd91cfc6be9926457f276fc001e2c6543e size: 1574
[EnvInject] - Injecting environment variables from a build step.
[EnvInject] - Injecting as environment variables the properties file path ‘tmp.tags‘
[EnvInject] - Variables injected successfully.
[SSH] script:
LAST_TAG="0.0.5"

sed -ri "s@(image\:.*\:).*@\1${LAST_TAG}@" /root/k8sdesktop.yaml

kubectl apply -f /root/k8sdesktop.yaml

[SSH] executing...
deployment "k8sdesktop-deployment" unchanged
service "k8sdesktop-deployment" unchanged

[SSH] completed
[SSH] exit-status: 0

[k8sdesktop] $ /bin/sh -xe /tmp/tomcat8-tomcat8-tmp/jenkins7903574837135018812.sh
+ rm -f tmp.tags
Finished: SUCCESS
 

jenkins構建docker鏡像上傳到harbor並發布到kubernetes