# Jenkins

[Jenkins](https://jenkins.io) is widely recognized as the most feature-rich CI available with easy configuration, continuous delivery and continuous integration support, easily test, build and stage your app, and more. It supports multiple SCM tools including CVS, Subversion and Git. It can execute Apache Ant and Apache Maven-based projects as well as arbitrary scripts.

## TL;DR;

```console
helm repo add bitnami https://charts.bitnami.com/bitnami
helm install my-release bitnami/jenkins
```

## Introduction

This chart bootstraps a [Jenkins](https://github.com/bitnami/bitnami-docker-jenkins) deployment on a [Kubernetes](http://kubernetes.io) cluster using the [Helm](https://helm.sh) package manager.

Bitnami charts can be used with [Kubeapps](https://kubeapps.com/) for deployment and management of Helm Charts in clusters. This Helm chart has been tested on top of [Bitnami Kubernetes Production Runtime](https://kubeprod.io/) (BKPR). Deploy BKPR to get automated TLS certificates, logging and monitoring for your applications.

## Prerequisites

- Kubernetes 1.12+
- Helm 2.12+ or Helm 3.0-beta3+
- PV provisioner support in the underlying infrastructure
- ReadWriteMany volumes for deployment scaling

## Installing the Chart

To install the chart with the release name `my-release`:

```console
helm repo add bitnami https://charts.bitnami.com/bitnami
helm install my-release bitnami/jenkins
```

These commands deploy Jenkins on the Kubernetes cluster in the default configuration. The [Parameters](#parameters) section lists the parameters that can be configured during installation.

> **Tip**: List all releases using `helm list`

## Uninstalling the Chart

To uninstall/delete the `my-release` deployment:

```console
helm delete my-release
```

The command removes all the Kubernetes components associated with the chart and deletes the release.

## Parameters

The following tables lists the configurable parameters of the Jenkins chart and their default values per section/component:

### Global parameters

| Parameter                              | Description                                                                                                          | Default                                                      |
|----------------------------------------|----------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------|
| `global.imageRegistry`                 | Global Docker image registry                                                                                         | `nil`                                                        |
| `global.imagePullSecrets`              | Global Docker registry secret names as an array                                                                      | `[]` (does not add image pull secrets to deployed pods)      |
| `global.storageClass`                  | Global storage class for dynamic provisioning                                                                        | `nil`                                                        |

### Common parameters

| Parameter                              | Description                                                                                                          | Default                                                      |
|----------------------------------------|----------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------|
| `nameOverride`                         | String to partially override jenkins.fullname template with a string (will prepend the release name)                 | `nil`                                                        |
| `fullnameOverride`                     | String to fully override jenkins.fullname template with a string                                                     | `nil`                                                        |
| `clusterDomain`                        | Default Kubernetes cluster domain                                                                                    | `cluster.local`                                              |

### Jenkins parameters

| Parameter                              | Description                                                                                                          | Default                                                      |
|----------------------------------------|----------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------|
| `image.registry`                       | Jenkins image registry                                                                                               | `docker.io`                                                  |
| `image.repository`                     | Jenkins Image name                                                                                                   | `bitnami/jenkins`                                            |
| `image.tag`                            | Jenkins Image tag                                                                                                    | `{TAG_NAME}`                                                 |
| `image.pullPolicy`                     | Jenkins image pull policy                                                                                            | `IfNotPresent`                                               |
| `image.pullSecrets`                    | Specify docker-registry secret names as an array                                                                     | `[]` (does not add image pull secrets to deployed pods)      |
| `jenkinsUser`                          | User of the application                                                                                              | `user`                                                       |
| `jenkinsPassword`                      | Application password                                                                                                 | _random 10 character alphanumeric string_                    |
| `jenkinsHome`                          | Jenkins home directory                                                                                               | `/opt/bitnami/jenkins/jenkins_home`                          |
| `disableInitialization`                | Allows to disable the initial Bitnami configuration for Jenkins                                                      | `no`                                                         |
| `javaOpts`                             | Customize JVM parameters                                                                                             | `nil`                                                        |
| `persistence.enabled`                  | Enable persistence using PVC                                                                                         | `true`                                                       |
| `persistence.storageClass`             | PVC Storage Class for Jenkins volume                                                                                 | `nil` (uses alpha storage class annotation)                  |
| `persistence.accessMode`               | PVC Access Mode for Jenkins volume                                                                                   | `ReadWriteOnce`                                              |
| `persistence.size`                     | PVC Storage Request for Jenkins volume                                                                               | `8Gi`                                                        |
| `persistence.annotations`              | Prsistence annotations                                                                                               | `{}`                                                         |
| `resources.limits`                     | Jenkins resource  limits                                                                                             | `{}`                                                         |
| `resources.requests`                   | Jenkins resource  requests                                                                                           | `{ cpu: "300m", memory: "512Mi" }`                           |
| `livenessProbe.enabled`                | Turn on and off liveness probe                                                                                       | `true`                                                       |
| `livenessProbe.initialDelaySeconds`    | Delay before liveness probe is initiated                                                                             | `180`                                                        |
| `livenessProbe.periodSeconds`          | How often to perform the probe                                                                                       | `10`                                                         |
| `livenessProbe.timeoutSeconds`         | When the probe times out                                                                                             | `5`                                                          |
| `livenessProbe.successThreshold`       | Minimum consecutive successes for the probe                                                                          | `1`                                                          |
| `livenessProbe.failureThreshold`       | Minimum consecutive failures for the probe                                                                           | `6`                                                          |
| `readinessProbe.enabled`               | Turn on and off readiness probe                                                                                      | `true`                                                       |
| `readinessProbe.initialDelaySeconds`   | Delay before readiness probe is initiated                                                                            | `30`                                                         |
| `readinessProbe.periodSeconds`         | How often to perform the probe                                                                                       | `5`                                                          |
| `readinessProbe.timeoutSeconds`        | When the probe times out                                                                                             | `3`                                                          |
| `readinessProbe.successThreshold`      | Minimum consecutive successes for the probe                                                                          | `1`                                                          |
| `readinessProbe.failureThreshold`      | Minimum consecutive failures for the probe                                                                           | `3`                                                          |
| `podAnnotations`                       | Pod annotations                                                                                                      | `{}`                                                         |
| `affinity`                             | Map of node/pod affinities                                                                                           | `{}` (The value is evaluated as a template)                  |
| `nodeSelector`                         | Node labels for pod assignment                                                                                       | `{}` (The value is evaluated as a template)                  |
| `tolerations`                          | Tolerations for pod assignment                                                                                       | `[]` (The value is evaluated as a template)                  |
| `podSecurityContext`                   | Jenkins pods' Security Context                                                                                       | `{ fsGroup: "1001" }`                                        |
| `containerSecurityContext`             | Jenkins containers' Security Context                                                                                 | `{ runAsUser: "1001" }`                                      |

### Exposure parameters

| Parameter                              | Description                                                                                                          | Default                                                      |
|----------------------------------------|----------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------|
| `service.type`                         | Kubernetes Service type                                                                                              | `LoadBalancer`                                               |
| `service.port`                         | Service HTTP port                                                                                                    | `80`                                                         |
| `service.httpsPort`                    | Service HTTPS port                                                                                                   | `443`                                                        |
| `service.nodePorts.http`               | Kubernetes http node port                                                                                            | `""`                                                         |
| `service.nodePorts.https`              | Kubernetes https node port                                                                                           | `""`                                                         |
| `service.externalTrafficPolicy`        | Enable client source IP preservation                                                                                 | `Cluster`                                                    |
| `service.loadBalancerIP`               | LoadBalancer service IP address                                                                                      | `""`                                                         |
| `service.annotations`                  | Service annotations                                                                                                  | `{}`                                                         |
| `ingress.enabled`                      | Enable ingress controller resource                                                                                   | `false`                                                      |
| `ingress.annotations`                  | Ingress annotations                                                                                                  | `{}`                                                         |
| `ingress.certManager`                  | Add annotations for cert-manager                                                                                     | `false`                                                      |
| `ingress.hostname`                     | Default host for the ingress resource                                                                                | `jenkins.local`                                              |
| `ingress.extraHosts[0].name`           | Additional hostnames to be covered                                                                                   | `nil`                                                        |
| `ingress.extraHosts[0].path`           | Additional hostnames to be covered                                                                                   | `nil`                                                        |
| `ingress.extraTls[0].hosts[0]`         | TLS configuration for additional hostnames to be covered                                                             | `nil`                                                        |
| `ingress.extraTls[0].secretName`       | TLS configuration for additional hostnames to be covered                                                             | `nil`                                                        |
| `ingress.secrets[0].name`              | TLS Secret Name                                                                                                      | `nil`                                                        |
| `ingress.secrets[0].certificate`       | TLS Secret Certificate                                                                                               | `nil`                                                        |
| `ingress.secrets[0].key`               | TLS Secret Key                                                                                                       | `nil`                                                        |

### Volume Permissions parameters

| Parameter                              | Description                                                                                                          | Default                                                      |
|----------------------------------------|----------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------|
| `volumePermissions.enabled`            | Enable init container that changes the owner and group of the persistent volume(s) mountpoint to `runAsUser:fsGroup` | `false`                                                      |
| `volumePermissions.image.registry`     | Init container volume-permissions image registry                                                                     | `docker.io`                                                  |
| `volumePermissions.image.repository`   | Init container volume-permissions image name                                                                         | `bitnami/minideb`                                            |
| `volumePermissions.image.tag`          | Init container volume-permissions image tag                                                                          | `buster`                                                     |
| `volumePermissions.image.pullPolicy`   | Init container volume-permissions image pull policy                                                                  | `Always`                                                     |
| `volumePermissions.image.pullSecrets`  | Specify docker-registry secret names as an array                                                                     | `[]` (does not add image pull secrets to deployed pods)      |
| `volumePermissions.resources.limits`   | Init container volume-permissions resource  limits                                                                   | `{}`                                                         |
| `volumePermissions.resources.requests` | Init container volume-permissions resource  requests                                                                 | `{}`                                                         |

### Metrics parameters

| Parameter                              | Description                                                                                                          | Default                                                      |
|----------------------------------------|----------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------|
| `metrics.enabled`                      | Start a side-car Jenkins prometheus exporter                                                                         | `false`                                                      |
| `metrics.image.registry`               | Jenkins exporter image registry                                                                                      | `docker.io`                                                  |
| `metrics.image.repository`             | Jenkins exporter image name                                                                                          | `bitnami/jenkins-exporter`                                   |
| `metrics.image.tag`                    | Jenkins exporter image tag                                                                                           | `{TAG_NAME}`                                                 |
| `metrics.image.pullPolicy`             | Image pull policy                                                                                                    | `IfNotPresent`                                               |
| `metrics.image.pullSecrets`            | Specify docker-registry secret names as an array                                                                     | `[]` (does not add image pull secrets to deployed pods)      |
| `metrics.podAnnotations`               | Additional annotations for Metrics exporter pod                                                                      | `{}`                                                         |
| `metrics.resources`                    | Exporter resource requests/limit                                                                                     | `requests: { cpu: "256m", memory: "100Mi" }`                 |
| `metrics.service.type`                 | Kubernetes service type (`ClusterIP`, `NodePort` or `LoadBalancer`)                                                  | `ClusterIP`                                                  |
| `metrics.service.port`                 | Jenkins Prometheus exporter service port                                                                             | `9122`                                                       |
| `metrics.service.nodePort`             | Kubernetes node port                                                                                                 | `""`                                                         |
| `metrics.service.annotations`          | Annotations for Jenkins Prometheus exporter service                                                                  | `{prometheus.io/scrape: "true", prometheus.io/port: "9118"}` |
| `metrics.service.loadBalancerIP`       | loadBalancerIP if service type is `LoadBalancer`                                                                     | `nil`                                                        |
| `metrics.serviceMonitor.enabled`       | if `true`, creates a Prometheus Operator ServiceMonitor (also requires `metrics.enabled` to be `true`)               | `false`                                                      |
| `metrics.serviceMonitor.namespace`     | Namespace in which Prometheus is running                                                                             | `nil`                                                        |
| `metrics.serviceMonitor.interval`      | Interval at which metrics should be scraped.                                                                         | `nil` (Prometheus Operator default value)                    |
| `metrics.serviceMonitor.scrapeTimeout` | Timeout after which the scrape is ended                                                                              | `nil` (Prometheus Operator default value)                    |
| `metrics.serviceMonitor.selector`      | Prometheus instance selector labels                                                                                  | `nil`                                                        |

The above parameters map to the env variables defined in [bitnami/jenkins](http://github.com/bitnami/bitnami-docker-jenkins). For more information please refer to the [bitnami/jenkins](http://github.com/bitnami/bitnami-docker-jenkins) image documentation.

Specify each parameter using the `--set key=value[,key=value]` argument to `helm install`. For example,

```console
$ helm install my-release \
  --set jenkinsUser=admin,jenkinsPassword=password \
    bitnami/jenkins
```

The above command sets the Jenkins administrator account username and password to `admin` and `password` respectively.

Alternatively, a YAML file that specifies the values for the above parameters can be provided while installing the chart. For example,

```console
helm install my-release -f values.yaml bitnami/jenkins
```

> **Tip**: You can use the default [values.yaml](values.yaml)

## Configuration and installation details

### [Rolling VS Immutable tags](https://docs.bitnami.com/containers/how-to/understand-rolling-tags-containers/)

It is strongly recommended to use immutable tags in a production environment. This ensures your deployment does not change automatically if the same tag is updated with a different image.

Bitnami will release a new chart updating its containers if a new version of the main container, significant changes, or critical vulnerabilities exist.

## Persistence

The [Bitnami Jenkins](https://github.com/bitnami/bitnami-docker-jenkins) image stores the Jenkins data and configurations at the `/bitnami/jenkins` path of the container.

Persistent Volume Claims are used to keep the data across deployments. This is known to work in GCE, AWS, and minikube.
See the [Parameters](#parameters) section to configure the PVC or to disable persistence.

## Upgrading

### To 5.0.0

The [Bitnami Jenkins](https://github.com/bitnami/bitnami-docker-jenkins) image was migrated to a "non-root" user approach. Previously the container ran as the `root` user and the Jenkins service was started as the `jenkins` user. From now on, both the container and the Jenkins service run as user `jenkins` (`uid=1001`). You can revert this behavior by setting the parameters `securityContext.runAsUser`, and `securityContext.fsGroup` to `root`.
Ingress configuration was also adapted to follow the Helm charts best practices.

Consequences:

- No "privileged" actions are allowed anymore.
- Backwards compatibility is not guaranteed when persistence is enabled.

To upgrade to `5.0.0`, install a new Jenkins chart, and migrate your Jenkins data ensuring the `jenkins` user has the appropiate permissions.

### To 4.0.0

Helm performs a lookup for the object based on its group (apps), version (v1), and kind (Deployment). Also known as its GroupVersionKind, or GVK. Changing the GVK is considered a compatibility breaker from Kubernetes' point of view, so you cannot "upgrade" those objects to the new GVK in-place. Earlier versions of Helm 3 did not perform the lookup correctly which has since been fixed to match the spec.

In 4dfac075aacf74405e31ae5b27df4369e84eb0b0 the `apiVersion` of the deployment resources was updated to `apps/v1` in tune with the api's deprecated, resulting in compatibility breakage.

This major version signifies this change.

### To 1.0.0

Backwards compatibility is not guaranteed unless you modify the labels used on the chart's deployments.
Use the workaround below to upgrade from versions previous to 1.0.0. The following example assumes that the release name is jenkins:

```console
kubectl patch deployment jenkins --type=json -p='[{"op": "remove", "path": "/spec/selector/matchLabels/chart"}]'
```
