How to add Java arguments to Jenkins on CloudBees CI Modern ?

Issue

  • Don’t know how to add/update Java arguments to Jenkins in CloudBees CI Modern

Environment

Resolution

In CloudBees CI on Modern Platforms, the Java Options are passed to the JVM running Jenkins via the JAVA_OPTS Environment variable set in the Pod spec. The Pod is managed by a StatefulSet and it is therefore the StatefulSet that must be updated. When the StatefulSet is updated, the managed Pod is deleted and a new pod is created with the updated values.

  • For Operations Center, the configuration is managed via Helm or manually via the cloudbees-core.yaml:
    • the Java Options must be updated in the configuration file (i.e. values.yaml with helm, cloudbees-core.yaml if manually)
    • the configuration must be applied (i.e. helm upgrade with helm, kubectl apply if manually): this will update the Operations Center StatefulSet and apply the changes made
  • For Managed Masters, the configuration is managed by Operations Center:
    • the Java Options must be updated in the Managed Master’s item configuration
    • the configuration must be applied by restarting the Managed Master from Operations Center: this will recreate the Master’s StatefulSet and apply the changes made

Operation Center

The Java Options of the Operations Center must be added to the JAVA_OPTS environment variable of the cjoc statefulset.

With Helm

You need to add the Java arguments to the OperationsCenter.JavaOpts attribute (e.g., --set OperationsCenter.JavaOpts). For example:

OperationsCenter:
  JavaOpts: >- 
    -Dhudson.slaves.NodeProvisioner.initialDelay=0
    -Dhudson.DNSMultiCast.disabled=true
    ...

Then apply the update configuration - for example helm upgrade cloudbees-core cloudbees/cloudbees-core -f values.yaml --version 3.15.0.

With .yaml modifications

In the cloudbees-core.yml locate the cjoc StatefulSet and add the argument to the existing, i.e:

...
    spec:
      containers:
      - env:
          ...  
        - name: JAVA_OPTS
          value: >-
            -XshowSettings:vm
            -XX:+PrintGCDetails
            -Dcb.IMProp.warProfiles.cje=kubernetes.json
            -Dcom.cloudbees.masterprovisioning.kubernetes.KubernetesMasterProvisioning.fsGroup=1000
            -Dhudson.lifecycle=hudson.lifecycle.ExitLifecycle
            -Dcom.cloudbees.jce.masterprovisioning.DockerImageDefinitionConfiguration.disableAutoConfiguration=true
            -Dcom.cloudbees.jce.masterprovisioning.DockerImageDefinitionConfiguration.masterImageName="CloudBees Core - Managed Master 2.176.1.4"
            -Dcom.cloudbees.jce.masterprovisioning.DockerImageDefinitionConfiguration.masterImage=cloudbees/cloudbees-core-mm:2.176.1.4

Then apply the update configuration - for example kubectl apply -f cloudbees-core.yml.

Alternatively, you can also edit directly JAVA_OPTS using kubectl edit statefulset/cjoc.

Managed Masters

The Java Options of Managed Masters can be set in different ways:

  • Java Options in the Managed Master configuration (per master configuration)
  • System Properties in the Managed Master configuration (per master configuration)

When managing many masters, a better strategy is to configure or enforce defaults:

  • Default Java Options in the Kubernetes Master Provisioning global configuration (default options for newly created masters)
  • Default System Properties in the Kubernetes Master Provisioning global configuration (default system properties for newly created masters)
  • Global Java Options in the Kubernetes Master Provisioning global configuration (enforced options for all provisioned masters)

Note: Java Options may contain System Properties, they are prefixed with -D. System Properties cannot contain Java Arguments such as -XshowSettings:vm or -XX:*

Master Java Options

Go to Operations Center Dashboard and click on Configure on the Managed Master you want to add the Java argument.

mmconfiguration

Once here, you can add your Java arguments under Provisioning > Java Options (separated with blank spaces, not line breaks).

Master System Properties

Go to Operations Center Dashboard and click on Configure on the Managed Master you want to add the Java argument.

mmconfiguration

Once here, you can add your System Properties under Provisioning > System Properties (separated with line breaks, not blank spaces). For example:

hudson.slaves.NodeProvisioner.initialDelay=0
hudson.DNSMultiCast.disabled=true

Master Default Java Options

Master Default Java Options are the default Java Options added to a Managed Master configuration when it is created. They are configurable in Operations Center.

(Note: Changes made to the Default Java Options are not reflected in the configuration of existing Managed Master)

Configure the Master Default Java Options

To configure those Default Java Options, go under Manage Jenkins > Configure System > Kubernetes Master Provisioning [Advanced] > Default Java Options.

Enforce the Master Default Java Options

To enforce those Default Java Options, add the environment variable MASTER_JAVA_OPTIONS to the Operations Center StatefulSet. In that case the options will not be configurable from the UI.

With Helm

This is currently not supported via Helm.

With .yaml modifications

In the cloudbees-core.yml locate the cjoc StatefulSet and add the argument to an environment variable named MASTER_GLOBAL_JAVA_OPTIONS, i.e:

...
    spec:
      containers:
      - env:
        - name: MASTER_JAVA_OPTIONS
          value: >- 
            -Dhudson.slaves.NodeProvisioner.initialDelay=0
            -Dhudson.DNSMultiCast.disabled=true
            ...

Then apply the update configuration - for example kubectl apply -f cloudbees-core.yml.

Master Default System Properties

Master Default System Properties are the default System Properties added to a Managed Master configuration when it is created. They are configurable in Operations Center.

To configure those Default System Properties Options, go under Manage Jenkins > Configure System > Kubernetes Master Provisioning [Advanced] > Default System Properties.

(Note: Changes made to the Default System Properties are not reflected in the configuration of existing Managed Master)

Master Global Java Options

Master Global Java Options are Java options that are enforcibly added to every Managed Master deployment and not configurable from the UI. Those Java Options are automatically appended to the Managed Master’s JAVA_OPTS environment variable during provisioning. They are enforced to all managed masters and not configurable from the UI.

(Note: Changes made to the Global Java Options are reflected to every Managed Master when re-provisioned)

Configure the Master Global Java Options

To configure those Global Java Options, go under Manage Jenkins > Configure System > Kubernetes Master Provisioning [Advanced] > Global Java Options.

Enforce the Master Global Java Options

To enforce those Global Java Options, add the environment variable MASTER_GLOBAL_JAVA_OPTIONS to the Operations Center StatefulSet. In that case the options will not be configurable from the UI.

With Helm

You need to add the Java arguments to the Master.JavaOpts attribute (e.g., --set Master.JavaOpts). For example:

Master:
  JavaOpts: >- 
    -Dhudson.slaves.NodeProvisioner.initialDelay=0
    -Dhudson.DNSMultiCast.disabled=true
    ...

Then apply the update configuration - for example helm upgrade cloudbees-core cloudbees/cloudbees-core -f values.yaml --version 3.15.0.

With .yaml modifications

In the cloudbees-core.yml locate the cjoc StatefulSet and add the argument to an environment variable named MASTER_GLOBAL_JAVA_OPTIONS, i.e:

...
    spec:
      containers:
      - env:
        - name: MASTER_GLOBAL_JAVA_OPTIONS
          value: >-  
            -Dhudson.slaves.NodeProvisioner.initialDelay=0
            -Dhudson.DNSMultiCast.disabled=true
            ...

Then apply the update configuration - for example kubectl apply -f cloudbees-core.yml.

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