jenkins

• basic

  • Java requirements

  • CPS

  • Viewing Jenkins Jobs' Configuration as XML

  • using style in Jenkins

• crumb issuer

  • get crumb

  • visit API via crumb

  • restart Jenkins instance

• run Jenkins

  • in docker

  • in kubernetes

  • via helm

• build Jenkins docker image

• run Jenkins API out of Jenkins

  • jenkins-core

references:

• CloudBeesTV

• Jenkins Tutorials

• Jenkins Plugin Developer Series

• Jenkins X

• CloudBees CI

• ci.jenkins.io

• Jenkins Code of Conduct

  • issues.jenkins.io

  • Jenkins JIRA

  • repo.jenkins-ci.org

• Dagger - a programmable CI/CD engine

basic

Java requirements

[!NOTE]

• Jenkins requires Java 11 or 17 since Jenkins 2.357 and LTS 2.361.1. Read more about this in the announcement blog post

  • Jenkins requires Java 11 or newer

• Java 11 end of life in Jenkins

  • Java Support Policy

• references:

  • Java 11 to 17 upgrade guidelines

  • Java 8 to 11 upgrade guidelines

• proxy

  • Setting JVM Options for Application Servers

  • ava HotSpot VM Command-Line Options

SUPPORTED JAVA VERSION	LTS RELEASE	WEEKLY RELEASE
Java 11, Java 17 or Java 21	N/A	2.419 (August 2023)
Java 11, Java 17	2.361.1 (September 2022)	2.357 (June 2022)
Java 8, Java 11 or Java 17	2.346.1 (June 2022)	2.340 (March 2022)
Java 8, Java 17	2.164.1 (March 2019)	2.164 (February 2019)

CPS

references:

• Jenkins Pipelines Generator

• Configuring Content Security Policy

• Rendering User Content

• How to Serve Resources from Jenkins

• Content Security Policy (CSP) for Web Report

• Unable to embed Jenkins page into an iframe. How to fix it?

• Continuous Integration series

  • Multi-environment deployments with Jenkins and Octopus

  • Deploying to Amazon EKS with Docker and Jenkins

  • Building a Docker image in Jenkinsfile and publishing to ECR

  • Deploying to Amazon EKS with Docker and Jenkins

  • Jenkins security tips

  • How to install a Jenkins instance with Helm

  • How to install Jenkins on Docker

  • Using dynamic build agents to automate scaling in Jenkins

Jenkins & Python

• Setting Jenkins CI for python application

• Jenkins and Python

others

• Where to download hudson library?

• Hooking into the Jenkins (Hudson) API, Part 1

• Hooking into the Jenkins (Hudson) API, Part 2

• How to import the class hudson outside jenkins?

• org.jenkins-ci.main » jenkins-core

war packages

• Jenkins Custom WAR Packager

The default rule set results in the following:

• No JavaScript allowed at all

• No plugins (object/embed) allowed

• No inline CSS, or CSS from other sites allowed

• No images from other sites allowed

• No frames allowed

• No web fonts allowed

• No XHR/AJAX allowed

Viewing Jenkins Jobs' Configuration as XML

1. install Job Configuration History

2. open in browser:

job url   : http: //localhost:8080/job/<job-name>/
conig url : http: //localhost:8080/job/<job-name>/config.xml

using style in Jenkins

references:

• * imarslo: css alert

• The Curious Case of the Slow Jenkins Job

• bootstrap alert

• callout

• success

  <div style="position:relative; padding:1rem 1rem; margin-bottom:1rem; border:1px solid transparent; border-radius:.375rem; padding-right:3rem; color:#0f5132; background-color:#d1e7dd; border-color:#badbcc">
    <h4 style="font-size: 1.5rem; color: inherit; margin-top:0;margin-bottom:.5rem;font-weight:500;line-height:1.2">Success Alert !</h4>
    This is a success alert with <a href="#" style="font-weight:700; color:#0c4128">an example link</a>. Give it a click if you like.
  </div>

• warning

  <div style="position:relative; padding:1rem 1rem; margin-bottom:1rem; border:1px solid transparent; border-radius:.375rem; padding-right:3rem; color:#664d03; background-color:#fff3cd; border-color:#ffecb5">
    <h4 style="font-size: 1.5rem; color: #523e02; margin-top:0;margin-bottom:.5rem;font-weight:500;line-height:1.2">Warning Alert !</h4>
    This is a warning alert with <a href="#" style="font-weight:700; color:#523e02">an example link</a>. Give it a click if you like.
  </div>

• info

  <div style="position:relative; padding:1rem 1rem; margin-bottom:1rem; border:1px solid transparent; border-radius:.375rem; padding-right:3rem; color:#055160; background-color:#cff4fc; border-color:#b6effb">
    <h4 style="font-size: 1.5rem; color:inherit; margin-top:0;margin-bottom:.5rem;font-weight:500;line-height:1.2">Info Alert !</h4>
    This is a info alert with <a href="#" style="font-weight:700; color:#04414d">an example link</a>. Give it a click if you like.
  </div>

crumb issuer

more info:

• CSRF Protection Explained

• Improved CSRF protection

• CSRF Protection

• Remote Access API

• Jenkins REST API example using crumb

• About the Jenkins infrastructure project

• jenkins on jenkins

• ci.jenkins.io

  • azure.ci.jenkins.io.yaml

  • trusted-ci.yaml

get crumb

jq for multiple values and another answer

• via groovy script

  import hudson.security.csrf.DefaultCrumbIssuer
  
  DefaultCrumbIssuer issuer = jenkins.model.Jenkins.instance.crumbIssuer
  jenkinsCrumb = "${issuer.crumbRequestField}:${issuer.crumb}"

  • result

    println jenkinsCrumb
    Jenkins-Crumb:7248f4a5***********

• via curl

  $ domain='jenkins.marslo.com'
  $ COOKIEJAR="$(mktemp)"
  $ curl -s \
         --cookie-jar "${COOKIEJAR} \
         https://${domain}/crumbIssuer/api/json |
         jq -r '[.crumbRequestField, .crumb] | "\(.[0]):\(.[1])"'
  Jenkins-Crumb:8b87b6ed98ef923******

  • or imarslo: json cheatsheet

    $ domain='jenkins.marslo.com'
    $ COOKIEJAR="$(mktemp)"
    $ curl -sSLg \
           --cookie-jar "${COOKIEJAR} \
           https://${domain}/crumbIssuer/api/json |
           jq -r '.crumbRequestField + ":" + .crumb'

  • or

    $ COOKIEJAR="$(mktemp)"
    $ curl -s \
           --cookie-jar "${COOKIEJAR} \
           http://jenkins.marslo.com/crumbIssuer/api/json |
           jq -r '[.crumbRequestField, .crumb] | join(":")'

  • or via xml

    $ COOKIEJAR="$(mktemp)"
    $ curl -sSLg \
           --cookie-jar "${COOKIEJAR} \
           "http://${JENKINS_URL}/crumbIssuer/api/xml?xpath=concat(//crumbRequestField,\":\",//crumb)"
    Jenkins-Crumb:8b87b6ed98ef923******

• via web page

• via wget

  • after jenkins 2.176.2

    # via xml api
    $ COOKIEJAR="$(mktemp)"
    $ wget --user=admin \
           --password=admin \
           --auth-no-challenge \
           --save-cookies "${COOKIEJAR}" \
           --keep-session-cookies \
           -q \
           --output-document \
           - \
           "https://localhost:8080/crumbIssuer/api/xml?xpath=concat(//crumbRequestField,%22:%22,//crumb)")"
    
    # via json api
    $ COOKIEJAR="$(mktemp)"
    $ wget --user=admin \
           --password=admin \
           --auth-no-challenge \
           --save-cookies "${COOKIEJAR}" \
           --keep-session-cookies \
           -q \
           --output-document \
           - \
           'https://jenkins.marslo.com/crumbIssuer/api/json' |
           jq -r '[.crumbRequestField, .crumb] | join(":")'

  • before jenkins 2.176.2

    # via xml
    $ wget --user=admin \
           --password=admin \
           --auth-no-challenge \
           -q \
           --output-document \
           - \
           'http://localhost:8080/crumbIssuer/api/xml?xpath=concat(//crumbRequestField,":",//crumb)'
    
    # via json
    $ wget --user=admin \
           --password=admin \
           --auth-no-challenge \
           -q \
           --output-document \
           - \
           'https://jenkins.marslo.com/crumbIssuer/api/json' |
           jq -r '[.crumbRequestField, .crumb] | join(":")'

visit API via crumb

@Current after 2.176.2

COOKIEJAR="$(mktemp)"
CRUMB=$(curl -u "admin:admin" \
             --cookie-jar "${COOKIEJAR}" \
             'https://jenkins.marslo.com/crumbIssuer/api/json' |
             jq -r '[.crumbRequestField, .crumb] | join(":")'
      )

@Dprecated before jenkins 2.176.2

url='http://jenkins.marslo.com'

CRUMB="$(curl -sSLg ${url}/crumbIssuer/api/json |
         jq -r .crumb \
       )"
CRUMB="Jenkins-Crumb:${CRUMB}"

# or
CRUMB="$(curl -s ${url}/crumbIssuer/api/json |
         jq -r '.crumbRequestField + ":" + .crumb' \
       )"

$ COOKIEJAR="$(mktemp)"
$ CRUMB=$(curl -u "admin:admin" \
             --cookie-jar "${COOKIEJAR}" \
             'https://jenkins.marslo.com/crumbIssuer/api/json' |
             jq -r '[.crumbRequestField, .crumb] | join(":")'
       )
$ curl -H "${CRUMB}" \
          -d 'cities=Lanzhou' \
          http://jenkins.marslo.com/job/marslo/job/sandbox/buildWithParameters

• or

  $ domain='jenkins.marslo.com'
  $ url="https://${domain}"
  $ COOKIEJAR="$(mktemp)"
  $ curl -H "$(curl -s \
                    --cookie-jar "${COOKIEJAR}" \
                    ${url}/crumbIssuer/api/json |
                    jq -r '.crumbRequestField + ":" + .crumb' \
              )" \
            -d 'cities=Lanzhou' \
            ${url}/job/marslo/job/sandbox/buildWithParameters

• or

  $ curl -H "Jenkins-Crumb:${CRUMB}" \
            --data 'cities=Leshan,Chengdu' \
            --data 'provinces=Sichuan' \
            http://jenkins.marslo.com/job/marslo/job/sandbox/buildWithParameters

• or

  $ domain='jenkins.marslo.com'
  $ url="https://${domain}"
  $ curl -H "$(curl -s ${url}/crumbIssuer/api/json | jq -r '.crumbRequestField + ":" + .crumb')" \
            --data 'cities=Leshan,Chengdu' \
            --data 'provinces=Sichuan' \
            ${url}/job/marslo/job/sandbox/buildWithParameters

build a job using the REST API and cURL

$ curl -X POST http://developer:developer@localhost:8080/job/test/build
# build with parameters
$ curl -X POST \
          http://developer:developer@localhost:8080/job/test/build \
          --data-urlencode json='{"parameter": [{"name":"paramA", "value":"123"}]}'

restart Jenkins instance

[!TIP]

• https://jenkins.sample.com/safeRestart

• https://jenkins.sample.com/restart

@Current after 2.176.2

COOKIEJAR="$(mktemp)"
CRUMB=$(curl -u "admin:admin" \
             --cookie-jar "${COOKIEJAR}" \
             'https://jenkins.marslo.com/crumbIssuer/api/json' |
             jq -r '[.crumbRequestField, .crumb] | join(":")'
      )

@Dprecated before jenkins 2.176.2

CRUMB="$(curl -sSLg http://jenkins.marslo.com/crumbIssuer/api/json |
         jq -r .crumb \
      )"
CRUMB="Jenkins-Crumb:${CRUMB}"
# or
CRUMB="$(curl -s ${url}/crumbIssuer/api/json |
         jq -r '.crumbRequestField + ":" + .crumb' \
      )"

$ curl -X POST \
       -H "${CRUMB}" \
       http://jenkins.marslo.com/safeRestart

• or

  $ domain='jenkins.marslo.com'
  $ url="https://${domain}"
  $ COOKIEJAR="$(mktemp)"
  $ curl -X POST \
         -H "$(curl -s \
                    --cookie-jar "${COOKIEJAR}" \
                    ${url}/crumbIssuer/api/json |
                    jq -r '.crumbRequestField + ":" + .crumb' \
            )" \
         ${url}/safeRestart

run Jenkins

refernce:

• How to install Jenkins on Docker

• Jenkins Features Controlled with System Properties

• -Dhudson.security.ArtifactsPermission=true

• remoting configuration

• IMPORTANT JENKINS COMMAND

• unable to deactivate CSRF via JCasC

• Security updates for Jenkins core

  • hudson.model.ParametersAction.keepUndefinedParameters=true

  • hudson.model.ParametersAction.safeParameters

[!TIP|label: latest jdk11 JAVA_OPT:]

-Duser.timezone='America/Los_Angeles'
-Dhudson.model.DirectoryBrowserSupport.CSP=""
-Djenkins.slaves.NioChannelSelector.disabled=true
-Djenkins.slaves.JnlpSlaveAgentProtocol3.enabled=false
-Djava.awt.headless=true
-Djenkins.security.ClassFilterImpl.SUPPRESS_WHITELIST=true
-Dhudson.model.ParametersAction.keepUndefinedParameters=true
-Dcom.cloudbees.workflow.rest.external.ChangeSetExt.resolveCommitAuthors=true
-Djenkins.install.runSetupWizard=true
-Dpermissive-script-security.enabled=true
-DsessionTimeout=1440
-DsessionEviction=43200
-Dgroovy.grape.report.downloads=true
-Divy.message.logger.level=4
-Dhudson.plugins.active_directory.ActiveDirectorySecurityRealm.forceLdaps=false
-Dfile.encoding=UTF-8
-Dsun.jnu.encoding=utf-8
-Djenkins.model.Jenkins.logStartupPerformance=true
-Dhudson.security.csrf.DefaultCrumbIssuer.EXCLUDE_SESSION_ID=true
-Xms192g
-Xmx192g
-XX:+AlwaysPreTouch
-XX:+HeapDumpOnOutOfMemoryError
-XX:+UseG1GC
-XX:+UseStringDeduplication
-XX:+UseCompressedClassPointers
-XX:+UseCompressedOops
-XX:+ParallelRefProcEnabled
-XX:+UnlockDiagnosticVMOptions
-XX:+UnlockExperimentalVMOptions
-XX:G1NewSizePercent=20
-XX:+PrintGC
-XX:+PrintGCDetails
-XX:+LogVMOutput
-XX:InitialRAMPercentage=50.0
-XX:MaxRAMPercentage=50.0
-XX:HeapDumpPath=/var/jenkins_home/logs
-XX:ErrorFile=/var/jenkins_home/logs/hs_err_%p.log
-XX:LogFile=/var/jenkins_home/logs/jvm.log
-Xlog:gc*=info,gc+heap=debug,gc+ref*=debug,gc+ergo*=trace,gc+age*=trace:file=/var/jenkins_home/logs/gc-%t.log:utctime,pid,level,tags:filecount=2,filesize=100M

in docker

$ docker run \
         --name jenkins \
         --rm \
         --detach   \
         --network jenkins \
         --env DOCKER_HOST=tcp://docker:2376   \
         --env DOCKER_CERT_PATH=/certs/client \
         --env DOCKER_TLS_VERIFY=1   \
         --publish 8080:8080 \
         --publish 50000:50000   \
         --volume jenkins-data:/var/jenkins_home   \
         --volume jenkins-docker-certs:/certs/client:ro   \
         jenkins/jenkins:latest

• docker run with JAVA_OPTS

  [!TIP] more on Properties in Jenkins Core for JAVA_OPTS

  • encoding

  • How locale setting can break unicode/UTF-8 in Java/Tomcat

  $ docker run \
           --name jenkins \
           --detach   \
           --rm \
           --network jenkins \
           --env DOCKER_HOST=tcp://docker:2376   \
           --env DOCKER_CERT_PATH=/certs/client \
           --env DOCKER_TLS_VERIFY=1   \
           --publish 8080:8080 \
           --publish 50000:50000   \
           --env JENKINS_ADMIN_ID=admin \
           --env JENKINS_ADMIN_PW=admin \
           --env JAVA_OPTS=" \
                  -XX:+UseG1GC \
                  -Xms8G  \
                  -Xmx16G \
                  -Dfile.encoding=UTF-8 \
                  -Dsun.jnu.encoding=utf-8 \
                  -DsessionTimeout=1440 \
                  -DsessionEviction=43200 \
                  -Djava.awt.headless=true \
                  -Djenkins.ui.refresh=true \
                  -Divy.message.logger.level=4 \
                  -Dhudson.Main.development=true \
                  -Duser.timezone='Asia/Chongqing' \
                  -Dgroovy.grape.report.downloads=true \
                  -Djenkins.install.runSetupWizard=true \
                  -Dpermissive-script-security.enabled=true \
                  -Dhudson.footerURL=https://jenkins.marslo.com \
                  -Djenkins.slaves.NioChannelSelector.disabled=true \
                  -Djenkins.slaves.JnlpSlaveAgentProtocol3.enabled=false \
                  -Dhudson.model.ParametersAction.keepUndefinedParameters=true \
                  -Djenkins.security.ClassFilterImpl.SUPPRESS_WHITELIST=true \
                  -Dhudson.security.ArtifactsPermission=true \
                  -Dhudson.security.LDAPSecurityRealm.groupSearch=true \
                  -Dhudson.security.csrf.DefaultCrumbIssuer.EXCLUDE_SESSION_ID=true \
                  -Dcom.cloudbees.workflow.rest.external.ChangeSetExt.resolveCommitAuthors=true \
                  -Dhudson.plugins.active_directory.ActiveDirectorySecurityRealm.forceLdaps=false \
                  -Dhudson.model.DirectoryBrowserSupport.CSP=\"sandbox allow-same-origin allow-scripts; default-src 'self'; script-src * 'unsafe-eval'; img-src *; style-src * 'unsafe-inline'; font-src *;\" \
                " \
           --env JNLP_PROTOCOL_OPTS="-Dorg.jenkinsci.remoting.engine.JnlpProtocol3.disabled=false" \
           --volume /opt/JENKINS_HOME:/var/jenkins_home \
           --volume /var/run/docker.sock:/var/run/docker.sock \
           jenkins/jenkins:latest

backup the docker volume

$ docker run --rm \
             -v jenkins_home:/var/jenkins_home \
             -v $(pwd):/backup \
             ubuntu \
             tar cvf /backup/backup.tar /var/jenkins_home

running docker images as services

$ cat /etc/systemd/system/docker-jenkins.service

[Unit]
Description=Jenkins

[Service]
SyslogIdentifier=docker-jenkins
ExecStartPre=-/usr/bin/docker create -m 0b -p 8080:8080 -p 50000:50000 --restart=always --name jenkins jenkins/jenkins:lts-jdk11
ExecStart=/usr/bin/docker start -a jenkins
ExecStop=-/usr/bin/docker stop --time=0 jenkins

[Install]
WantedBy=multi-user.target

$ sudo systemctl daemon-reload
$ sudo systemctl enable docker-jenkins
$ sudo systemctl start docker-jenkins

# check log
$ sudo journalctl -u docker-jenkins -f

in kubernetes

reference:

• official yaml

• official sa yaml

$ cat << EOF | kubectl apply -f -
# namespace
---
kind: Namespace
apiVersion: v1
metadata:
  name: devops
  labels:
    name: devops

# quota
---
apiVersion: v1
kind: ResourceQuota
metadata:
  name: quota
  namespace: devops
spec:
  hard:
    requests.cpu: "48"
    requests.memory: 48Gi
    limits.cpu: "48"
    limits.memory: 48Gi

# sa
---
apiVersion: v1
kind: ServiceAccount
metadata:
  labels:
    k8s-app: jenkins
  name: jenkins-admin
  namespace: devops
---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
  name: jenkins-admin
  labels:
    k8s-app: jenkins
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
- kind: ServiceAccount
  name: jenkins-admin
  namespace: devops

# pv & pvc
---
kind: PersistentVolume
apiVersion: v1
metadata:
  name: jenkins-pv
spec:
  capacity:
    storage: 200Gi
  accessModes:
    - ReadWriteMany
  nfs:
    server: 1.2.3.4
    path: "/jenkins_vol/jenkins/DEVOPS_JENKINS"
---
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: jenkins-pvc
  namespace: devops
spec:
  accessModes:
  - ReadWriteMany
  resources:
    requests:
      storage: 100Gi
  storageClassName: ""
  volumeName: jenkins-pv

# deploy
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: jenkins
  namespace: devops
spec:
  replicas: 1
  selector:
    matchLabels:
      app: jenkins
  template:
    metadata:
      labels:
        app: jenkins
    spec:
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
            - matchExpressions:
              - key: kubernetes.io/hostname
                operator: In
                values:
                - aws-hostname-01
                - aws-hostname-02
      containers:
        - name: jenkins
          image: jenkins/jenkins:latest
          imagePullPolicy: IfNotPresent
          env:
            - name: JAVA_OPTS
              value: -Xms2048m
                     -Xmx10240m
                     -XX:PermSize=2048m
                     -XX:MaxPermSize=10240m
                     -DsessionTimeout=1440
                     -DsessionEviction=43200
                     -Djava.awt.headless=true
                     -Divy.message.logger.level=4
                     -Dfile.encoding=UTF-8
                     -Dsun.jnu.encoding=utf-8
                     -Duser.timezone='Asia/Chongqing'
                     -Djenkins.install.runSetupWizard=true
                     -Dpermissive-script-security.enabled=true
                     -Djenkins.slaves.NioChannelSelector.disabled=true
                     -Djenkins.slaves.JnlpSlaveAgentProtocol3.enabled=false
                     -Djenkins.security.ClassFilterImpl.SUPPRESS_WHITELIST=true
                     -Dhudson.model.ParametersAction.keepUndefinedParameters=true
                     -Dcom.cloudbees.workflow.rest.external.ChangeSetExt.resolveCommitAuthors=true
                     -Dhudson.plugins.active_directory.ActiveDirectorySecurityRealm.forceLdaps=false
                     -Dhudson.model.DirectoryBrowserSupport.CSP="sandbox allow-same-origin allow-scripts; default-src 'self'; script-src * 'unsafe-eval'; img-src *; style-src * 'unsafe-inline'; font-src *;"
            - name: JNLP_PROTOCOL_OPTS
              value: -Dorg.jenkinsci.remoting.engine.JnlpProtocol3.disabled=false
          ports:
            - name: http-port
              containerPort: 8080
            - name: jnlp-port
              containerPort: 50000
            - name: cli-port
              containerPort: 38338
          volumeMounts:
            - name: jenkins-home
              mountPath: /var/jenkins_home
          resources:
            requests:
              memory: '8Gi'
              cpu: '8'
            limits:
              memory: '16Gi'
              cpu: '16'
      volumes:
        - name: jenkins-home
          persistentVolumeClaim:
            claimName: jenkins-pvc
      serviceAccount: "jenkins-admin"

# svc
---
apiVersion: v1
kind: Service
metadata:
  name: jenkins
  namespace: devops
spec:
  template:
    metadata:
      labels:
        name: jenkins
spec:
  type: ClusterIP
  ports:
    - name: jenkins
      port: 8080
      targetPort: 8080
  selector:
    app: jenkins
---
apiVersion: v1
kind: Service
metadata:
  name: jenkins-discovery
  namespace: devops
spec:
  template:
    metadata:
      labels:
        name: jenkins-discovery
spec:
  type: NodePort
  ports:
    - name: jenkins-agent
      port: 50000
      targetPort: 50000
    - name: cli-agent
      port: 38338
      targetPort: 38338
  selector:
    app: jenkins

# ing (for traefik ingress)
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: jenkins
  namespace: devops
  annotations:
    kubernetes.io/ingress.class: traefik
    ingress.kubernetes.io/whitelist-x-forwarded-for: "false"
    traefik.frontend.redirect.entryPoint: https
    ingress.kubernetes.io/ssl-redirect: "true"
  labels:
    app: jenkins
spec:
  rules:
  - host: jenkins.mysite.com
    http:
      paths:
      - backend:
          serviceName: jenkins
          servicePort: 8080
  tls:
  - hosts:
    - jenkins.mysite.com
    secretName: mysite-tls
EOF

• for nginx ingress

  ---
  apiVersion: extensions/v1beta1
  kind: Ingress
  metadata:
    name: jenkins
    namespace: devops
    annotations:
      kubernetes.io/ingress.class: "nginx"
      nginx.ingress.kubernetes.io/secure-backends: "true"
      nginx.ingress.kubernetes.io/backend-protocol: "HTTP"
      kubernetes.io/ingress.allow-http: "false"
  spec:
    tls:
    - hosts:
      - jenkins.mysite.com
      secretName: mysite-certs
    rules:
    - host: jenkins.mysite.com
      http:
        paths:
        - path:
          backend:
            serviceName: jenkins
            servicePort: 8080

via helm

[!TIP]

• How to install a Jenkins instance with Helm

• OctopusSamples/jenkins-complete-image

$ helm repo add jenkins https://charts.jenkins.io
$ helm repo update

$ helm upgrade --install myjenkins jenkins/jenkins

$ kubectl exec --namespace default \
               -it svc/myjenkins \
               -c jenkins -- /bin/cat /run/secrets/chart-admin-password && echo

forward port

$ kubectl --namespace default port-forward svc/myjenkins 8080:8080

show Load Balancer

[!TIP]

• Load Balancers vs API Gateways

$ helm show values jenkins/jenkins
...
controller:
  serviceType: LoadBalancer
...

upgrade

$ helm upgrade --install -f values.yaml myjenkins jenkins/jenkins

get info

$ kubectl get svc --namespace default myjenkins --template "{{ range (index .status.loadBalancer.ingress 0) }}{{ . }}{{ end }}"
a84aa6226d6e5496882cfafdd6564a35-901117307.us-west-1.elb.amazonaws.com

$ kubectl get pods
NAME                                     READY   STATUS              RESTARTS   AGE
java-9-k0hmj-vcvdz-wknh4                 0/1     ContainerCreating   0          1s
myjenkins-0                              2/2     Running             0          49m

customizing

installing additional plugins

...
controller:
    additionalPlugins:
    - octopusdeploy:3.1.6
...

customizing jenkins docker image

...
controller:
  image: "docker.io/mcasperson/myjenkins"
  tag: "latest"
  installPlugins: false
...

adding jenkins agents

...
agent:
  podName: default
  customJenkinsLabels: default
  resources:
    limits:
      cpu: "1"
      memory: "2048Mi"
...

• defines a second pod template

  ...
  agent:
    podName: default
    customJenkinsLabels: default
    resources:
      limits:
        cpu: "1"
        memory: "2048Mi"
  additionalAgents:
    maven:
      podName: maven
      customJenkinsLabels: maven
      image: jenkins/jnlp-agent-maven
      tag: latest
  ...

  • jenkinsfile

    pipeline {
      agent {
        kubernetes {
          inheritFrom 'maven'
        }
      }
    
      // ...
    }

backup jenkins home

$ kubectl exec -c jenkins myjenkins-0 -- tar czf /tmp/backup.tar.gz /var/jenkins_home
$ kubectl cp -c jenkins myjenkins-0:/tmp/backup.tar.gz ./backup.tar.gz

build Jenkins docker image

[!TIP|label: references:]

• jenkins-complete-image/Dockerfile

FROM jenkins/jenkins:lts-jdk11
USER root
RUN apt update && \
    apt install -y --no-install-recommends gnupg curl ca-certificates apt-transport-https && \
    curl -sSfL https://apt.octopus.com/public.key | apt-key add - && \
    sh -c "echo deb https://apt.octopus.com/ stable main > /etc/apt/sources.list.d/octopus.com.list" && \
    apt update && apt install -y octopuscli
RUN jenkins-plugin-cli --plugins octopusdeploy:3.1.6 kubernetes:1.29.2 workflow-aggregator:2.6 git:4.7.1 configuration-as-code:1.52
USER jenkins

run Jenkins API out of Jenkins

references:

• * Jenkins API

• * Jenkins API - how to trigger a Jenbkins job programmatically

• * Jenkins REST Plugin

  • jenkinsci/java-client-api

  • cdancy/jenkins-rest

• Dependency management with Grape

• Hooking into the Jenkins (Hudson) API, Part 1

• Hooking into the Jenkins (Hudson) API, Part 2

  • kellyrob99/Jenkins-api-tour

• Where to download hudson library?

• XmlPullParserException thrown when trying to run groovy script from within a Jenkins job

• How do I Import a Jenkins plugins in Groovyscript?

• How to import the jenkins-api in Groovy?

• What are the Java arguments for proxy authorization?

• Dependencies and Class Loading

• javadoc

  • Package hudson.util

  • Package hudson.model

• mvnrepository.com

  • org.eclipse.hudson.main » hudson-core

  • org.jenkins-ci.main » jenkins-core

  • Pipeline: Job : org.jenkins-ci.plugins.workflow » workflow-job

  • Pipeline: Groovy : org.jenkins-ci.plugins.workflow » workflow-cps

  • Pipeline: API : org.jenkins-ci.plugins.workflow » workflow-api

  • Pipeline: Nodes and Processes : org.jenkins-ci.plugins.workflow » workflow-durable-task-step

  • Pipeline: Parent : org.jenkins-ci.plugins.workflow » workflow-pom

  • RESTEasy JAX RS Implementation : org.jboss.resteasy » resteasy-jaxrs

  • RESTEasy Jackson 2 Provider : org.jboss.resteasy » resteasy-jackson2-provider

  • javax/ws/rs

    • JAX RS API : javax.ws.rs » javax.ws.rs

• com/clarolab

• maven central

• maven.glassfish.org

• repo.jenkins-ci.org

• source code

  • jenkins/core/src/main/java/jenkins/model/Jenkins.java

• more

  • JAX-RS

@GrabResolver(name='jenkins', root='https://repo.jenkins-ci.org/public/')
@Grapes([
  @Grab(group='org.jenkins-ci.main', module='jenkins-core', version='2.167')
])

import hudson.model.*

• or

  @GrabResolver(name='jenkins', root='https://repo.jenkins-ci.org/public/')
  @Grab(group='org.jenkins-ci.main', module='jenkins-core', version='2.377')

jenkins-core

@GrabResolver(name='jenkins', root='https://repo.jenkins-ci.org/releases')
@Grab(group='org.jenkins-ci.main', module='jenkins-core', version='2.377')

import hudson.Util

println Util.XS_DATETIME_FORMATTER.format( new Date() )

• result

  2022-11-23T13:39:34Z

org.jenkinsci.plugins.workflow

// Groovy Version: 3.0.13 JVM: 11.0.15.1
@GrabResolver(name='jenkins', root='https://repo.jenkins-ci.org/releases')
@Grab(group='org.jenkins-ci.main', module='jenkins-core', version='2.377')
@Grab(group='org.jenkins-ci.plugins.workflow', module='workflow-job', version='1254.v3f64639b_11dd')
@Grab(group='org.jenkins-ci.plugins.workflow', module='workflow-basic-steps', version='991.v43d80fea_ff66', scope='test')
@Grab(group='org.jenkins-ci.plugins.workflow', module='workflow-api', version='1192.v2d0deb_19d212')

import jenkins.model.Jenkins
import hudson.model.Job
import hudson.Util
import org.jenkinsci.plugins.workflow.job.WorkflowJob
import org.jenkinsci.plugins.workflow.flow.BlockableResume

String rootUrl = 'https://jenkins.sample.com'

Map<String, WorkflowJob> jobs = jenkins.getJobs()
println jobs

// output
// Caught: groovy.lang.MissingPropertyException: No such property: jenkins for class: jenkins-job

com.cdancy.jenkins.rest.JenkinsClient

@GrabResolver(name='jenkins', root='https://repo.jenkins-ci.org/releases')
@Grab(group='org.jenkins-ci.main', module='jenkins-core', version='2.377')
@Grab(group='org.jenkins-ci.plugins.workflow', module='workflow-api', version='1200.v8005c684b_a_c6')
@Grab(group='org.jenkins-ci.plugins.workflow', module='workflow-job', version='1254.v3f64639b_11dd')
@Grab(group='org.jenkins-ci.plugins.workflow', module='workflow-step-api', version='639.v6eca_cd8c04a_a_')
@Grab(group='javax.ws', module='rs', version='2.0.1')
@Grab(group='io.github.cdancy', module='jenkins-rest', version='1.0.2')

import jenkins.model.Jenkins
import hudson.Util
import hudson.model.Job
import org.jenkinsci.plugins.workflow.job.WorkflowJob

import com.cdancy.jenkins.rest.JenkinsClient

String jenkinsUrl = 'https://jenkins.sample.com'
String userName   = 'admin'
String password   = 'admin'

JenkinsClient client = JenkinsClient.builder()
                                    .endPoint( jenkinsUrl )
                                    .credentials( "${userName}:${password}" )
                                    .build();
println client.getClass()
println client.api().systemApi().systemInfo().getClass()
println client.api().getClass()

// Groovy Version: 3.0.13 JVM: 11.0.15.1
// output
// class com.cdancy.jenkins.rest.JenkinsClient
// class com.cdancy.jenkins.rest.domain.system.AutoValue_SystemInfo
// class com.sun.proxy.$Proxy68