EC2 plugin: instances not starting

[Amedee Van Gasse]

$JENKINS_URL/configureClouds/

Add new cloud: Amazon EC2

Name: Amazon EC2 eu-central-1

Amazon EC2 Credentials: AKIA...

Region: eu-central-1

EC2 Key Pair's Private Key: ubuntu

Test connection: success

Advanced...

Instance Cap: 3

No delay provisioning: checked

Add AMI

Description: Linux node

AMI ID: ami-0293...

Check AMI: 05052029...

Instance Type: T3aMedium

EBS Optimized: checked

Monitoring: checked

T2 Unlimited: checked

Security group names: sg-0c2d... (opens SSH port 22)

Remote FS root: ./jenkins

Remote user: ubuntu

AMI Type: unix

Labels: aws ubuntu linux

Usage: Use this node as much as possible

Idle termination time: 30

Advanced...

Number of executors: 2

Stop/Disconnect on Idle Timeout: checked

Minimum number of instances: 1

Minimum number of spare instances: 0

Instance cap: 10

Block device mapping: /dev/sda1=snap-0eadbe3f...:200:true:gp2, /dev/sdb=ephemeral0, /dev/sdc=ephemeral1

Associate Public IP: checked

Connection Strategy: Public DNS

Host Key Verification Strategy: off

Maximum Total Uses: 10

Environment variables: checked

(not listing all environment variables)

Tool locations: checked

(not listing all tool locations)

With this configuration, I would expect that at least 1 EC2 instance would be started, but no instance is started. What do I need to change?