Cloudformation Template

Question

so I am looking to get MySQL install if I specify parameter environment as prod and if dev mariadb get installed  from userdata script of this cloudformation template but it is not happening. Please guide on this how to do it?
AWSTemplateFormatVersion: "2010-09-09"
Parameters:
  Environment:
    Description: "The environment to deploy to (dev or prod)"
    Type: String
    Default: "dev"
Resources:
  EC2Instance:
    Type: "AWS::EC2::Instance"
    Properties:
      InstanceType: "t2.micro"
      ImageId: "ami-0f8ca728008ff5af4"
      KeyName: "devops"
      SecurityGroupIds: 
        - "sg-02464c840862fddaf"
      SubnetId: "subnet-0b2bbe1a860c1ec8f"
      UserData: !Base64 |
        #!/bin/bash
        if [ "${Environment}" == "prod" ]; then
        # Install MySQL on production instances
        sudo apt-get update
        sudo apt install mysql-server -y
        sudo systemctl restart mysql
        sudo systemctl enable mysql
        elif [ "${Environment}" == "dev" ]; then
        # Install MariaDB on development instances
        sudo apt-get update
        sudo apt install mariadb-server mariadb-client -y
        sudo systemctl enable mariadb
        fi
      Tags:
        - Key: "Name"
          Value: "MyNewInstance"

Answer

You can do this with Conditions in the template, then test this condition and choose between defining the UserData property with the MySQL or MariaDB install.  Something like this:

```
Conditions:
  CreateProdResources: !Equals [!Ref Environment, "prod"]
```
Then:

```
UserData: !If [CreateProdResources, !Base64 |
#!/bin/bash
# Install MySQL on production instances
sudo apt-get update
sudo apt install mysql-server -y
sudo systemctl restart mysql
sudo systemctl enable mysql, !Base64 |
# Install MariaDB on development instances
sudo apt-get update
sudo apt install mariadb-server mariadb-client -y
sudo systemctl enable mariadb]
```

Cloudformation Template

Conteúdo relevante