Jenkins as code example to autostart jenkins workers as nomad batch j…

…obs (#82)

* importing minimal jasc setup for nomad jenkins workers
* fix: general cleanup

Signed-off-by: Bram Vogelaar <[email protected]>

packs/jenkins/README.md

@@ -25,8 +25,12 @@ This pack contains all you need to deploy jenkins (version 2 by default) in Noma
 ## Jenkins Environment Variables
 
 You can pass the right environment variables to Jenkins.
-An example of the `docker_jenkins_env_vars` to use is in the `vars.nomad` file.
+An example of the `docker_jenkins_env_vars` to use is in the `examples/vars.nomad` file.
 
 ## Jenkins as Code
 
-An example as to how the `configuration-as-code` plugin can be used to create and configure jenkins is in the `vars_jasc.nomad` file.
+An example as to how use the `configuration-as-code` plugin can be used to create and configure jenkins is in the `examples/vars_jasc.nomad` file.
+
+## Nomad Job Runners
+
+An example as to how the `nomad` plugin can be used to create and configure autoscaling jenkins workers in nomad itself is in the `examples/vars_cloud.nomad` file.

packs/jenkins/examples/vars_cloud.nomad

@@ -0,0 +1,79 @@
+docker_jenkins_env_vars = {
+  "java_opts": "-Djava.awt.headless=true -Djenkins.install.runSetupWizard=false",
+}
+jasc_config = <<EOF
+jenkins:
+  agentProtocols:
+  - "JNLP4-connect"
+  - "Ping"
+  clouds:
+  - nomad:
+      name: "nomad"
+      nomadUrl: "http://{{ env "attr.unique.network.ip-address" }}:4646"
+      prune: true
+      templates:
+      - idleTerminationInMinutes: 10
+        jobTemplate: |-
+          {
+            "Job": {
+              "Region": "global",
+              "ID": "%WORKER_NAME%",
+              "Type": "batch",
+              "Datacenters": [
+                "dc1"
+              ],
+              "TaskGroups": [
+                {
+                  "Name": "jenkins-worker-taskgroup",
+                  "Count": 1,
+                  "RestartPolicy": {
+                    "Attempts": 0,
+                    "Interval": 10000000000,
+                    "Mode": "fail",
+                    "Delay": 1000000000
+                  },
+                  "Tasks": [
+                    {
+                      "Name": "jenkins-worker",
+                      "Driver": "docker",
+                      "Config": {
+                        "image": "jenkins/inbound-agent"
+                      },
+                      "Env": {
+                        "JENKINS_URL": "http://{{ env "NOMAD_ADDR_http" }}",
+                        "JENKINS_AGENT_NAME": "%WORKER_NAME%",
+                        "JENKINS_SECRET": "%WORKER_SECRET%",
+                        "JENKINS_TUNNEL": "{{ env "NOMAD_ADDR_jnlp" }}"
+                      },
+                      "Resources": {
+                        "CPU": 500,
+                        "MemoryMB": 256
+                      }
+                    }
+                  ],
+                  "EphemeralDisk": {
+                    "SizeMB": 300
+                  }
+                }
+              ]
+            }
+          }
+        labels: "nomad"
+        numExecutors: 1
+        prefix: "jenkins"
+        reusable: true
+      tlsEnabled: false
+      workerTimeout: 1
+  numExecutors: 0
+jobs:
+  - script: >
+      job('nomad') {
+        label('nomad')
+        steps {
+            shell('whoami')
+        }
+      }
+EOF
+plugins = ["configuration-as-code", "hashicorp-vault-plugin", "job-dsl", "nomad"]
+register_consul_service = true
+volume_name = "jenkins"

packs/jenkins/templates/jenkins.nomad.tpl

@@ -123,6 +123,11 @@ EOF
         destination   = "local/plugins.txt"
         change_mode   = "noop"
       }
+
+      resources {
+        cpu    = [[ .jenkins.task_resources.cpu ]]
+        memory = [[ .jenkins.task_resources.memory ]]
+      }
     }
     [[- end ]]