Use Jenkins-agent as Azure container instance - azure

Question

I'm following the steps in this tutorial. I'm having trouble executing this CLI command:
az container create \
--name docks \
--resource-group MyResourceGroup \
--ip-address Public \
--image jenkins/inbound-agent:latest \
--os-type linux \
--ports 80 \
--command-line "jenkins-agent -url http://jenkinsServer:8080 secret agentName"
It gives the following output:
{
"containers": [
{
"command": [
"jenkins-agent",
"-url",
"http://jenkinsServer:8080",
"secret",
"agentName"
],
"environmentVariables": [],
"image": "jenkins/inbound-agent:latest",
"instanceView": {
"currentState": {
"detailStatus": "CrashLoopBackOff: Back-off restarting failed",
"exitCode": null,
"finishTime": null,
"startTime": null,
"state": "Waiting"
},
"events": [
{
"count": 1,
"firstTimestamp": "2022-09-07T16:57:57+00:00",
"lastTimestamp": "2022-09-07T16:57:57+00:00",
"message": "pulling image \"jenkins/inbound-agent#sha256:f495769bfc767bc77f6c2f8268a734dbac98249449f139f95fc434eb26c6489a\"",
"name": "Pulling",
"type": "Normal"
},
{
"count": 1,
"firstTimestamp": "2022-09-07T16:59:00+00:00",
"lastTimestamp": "2022-09-07T16:59:00+00:00",
"message": "Successfully pulled image \"jenkins/inbound-agent#sha256:f495769bfc767bc77f6c2f8268a734dbac98249449f139f95fc434eb26c6489a\"",
"name": "Pulled",
"type": "Normal"
},
{
"count": 2,
"firstTimestamp": "2022-09-07T16:59:57+00:00",
"lastTimestamp": "2022-09-07T17:00:18+00:00",
"message": "Started container",
"name": "Started",
"type": "Normal"
},
{
"count": 1,
"firstTimestamp": "2022-09-07T17:00:08+00:00",
"lastTimestamp": "2022-09-07T17:00:08+00:00",
"message": "Killing container with id XXXXXXXXXXXXXXXXXXXXXXX.",
"name": "Killing",
"type": "Normal"
}
],
"previousState": {
"detailStatus": "Error",
"exitCode": 255,
"finishTime": "2022-09-07T17:00:29.169000+00:00",
"startTime": "2022-09-07T17:00:18.785000+00:00",
"state": "Terminated"
},
"restartCount": 1
},
"livenessProbe": null,
"name": "docks",
"ports": [
{
"port": 80,
"protocol": "TCP"
}
],
"readinessProbe": null,
"resources": {
"limits": null,
"requests": {
"cpu": 1.0,
"gpu": null,
"memoryInGb": 1.5
}
},
"volumeMounts": null
}
],
"diagnostics": null,
"dnsConfig": null,
"encryptionProperties": null,
"id": "/subscriptions/azureSub/resourceGroups/MyResourceGroup/providers/Microsoft.ContainerInstance/containerGroups/docks",
"identity": null,
"imageRegistryCredentials": null,
"initContainers": [],
"instanceView": {
"events": [],
"state": "Running"
},
"ipAddress": {
"dnsNameLabel": null,
"fqdn": null,
"ip": "XX.XXX.XXX.XX",
"ports": [
{
"port": 80,
"protocol": "TCP"
}
],
"type": "Public"
},
"location": "westeurope",
"name": "docks",
"osType": "Linux",
"provisioningState": "Succeeded",
"resourceGroup": "MyResourceGroup",
"restartPolicy": "Always",
"sku": "Standard",
"subnetIds": null,
"tags": {},
"type": "Microsoft.ContainerInstance/containerGroups",
"volumes": null,
"zones": null
}
As you see it gives a 255 Error, however I didn't find anything related to it yet.
I also tried to change the --command-line to:
java -jar agent.jar -jnlpUrl http://jenkinsServer:8080 secret agentName
But the same output happens.
This creates the Container, but it keeps restarting indefinitely (starts and fails).
The Jenkins server is in a Linux VM made following this tutorial
How can I make a Jenkins agent from the VM be run in a docker container image using Azure?

Answer 1

When I tried to reproduce the issue, noted that we have different ways to get CrashLoopBackOff error.
1). ENVIRONMENT VARIABLES SETUP
CrashLoopBackOff will occur when the environment variables are set incorrectly.
please check the ENV_PATH set to be correct or not
type ENV in Azure Cli or PowerShell
2). INSTALLING THE CORRECT VERSION OF S/W
can you please check which java version you have installed
if it is JDK-8, please update it to 11.0.16.1, it will work
apt-get update -y
apt-get install openjdk-11-jdk
after installing java I have followed the steps Ms-Doc and created the container instance successfully.
az container create \
--name docks \
--resource-group jenkins-get-started-rgz \
--ip-address Public \
--image jenkins/inbound-agent:latest \
--os-type linux \
--ports 80 \
--command-line "jenkins-agent -url http://jenkinsServer:8080 JENKINS_SECRET AGENT_NAME"
NOTE:
if the EXIT CODE is "0" means we have created the container instance successfully
if the EXIT CODE is in between "1-255" it corresponds to error.