jenkins

references:

basic

[!NOTE]
Java 11 end of life in Jenkins
references:
proxy

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 & Python
others
war packages

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

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:

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:

get crumb

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******

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

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

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

# 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(":")'

# 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

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

$ 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

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

$ 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

$ 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"}]}'

[!TIP]
https://jenkins.sample.com/safeRestart
https://jenkins.sample.com/restart

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

$ 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:
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

$ 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:

$ 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]

$ 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]

$ 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:]

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:

javadoc
source code
more

@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.*

@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

@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

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