Run UserData after instance initialize - amazon-web-services

Question

I´m using cloudformation to create an ec2 instance through an AMI which contains a docker image.
The idea is use userData to run the docker image once that the instance is initialized.
But once that I connect by ssh and check the docker containers, no docker container is running.
This is my cloudformation template
"instancei0755a35a9c753812d": {
"Type": "AWS::EC2::Instance",
"Properties": {
"DisableApiTermination": "false",
"InstanceInitiatedShutdownBehavior": "stop",
"ImageId": "ami-foooo",
"InstanceType": "t2.medium",
"KeyName": "jenkins_price",
"Monitoring": "false",
"Tags": [
{
"Key": "Name",
"Value": "Jenkins"
},
{
"Key": "Type",
"Value": "jenkins"
}
],
"Volumes": [
{
"Device": "/dev/sdf",
"VolumeId": {
"Ref": "volumevolab668c6e"
}
}
],
"NetworkInterfaces": [
{
"AssociatePublicIpAddress": true,
"DeleteOnTermination": "true",
"DeviceIndex": 0,
"SubnetId": {
"Ref": "subnet"
},
"GroupSet": [
{
"Ref": "jenkinsSg"
},
{
"Ref": "usersSshSg"
}
]
}
],
"UserData": {
"Fn::Base64": {
"Fn::Join": [
"",
[
"#!/bin/bash -v\n",
"# Run Jenkins docker image\n",
"cd /home/ec2-user/price_aws/images/jenkins\n",
"docker-compose up &\n"
]
]
}
}
}
}
}
As far as I know UserData should be executed once the instance is running.
I´m doing something wrong?
Regards.