Cloudformation with Bitnami Redis Server

template.yml

AWSTemplateFormatVersion: "2010-09-09"
Description: Provision Bitnami Redis Server with cloudformation
Parameters:
  RedisPassword:
    Type: String
    Description: Redis password

Resources:
  RedisEc2Instance:
    Type: AWS::EC2::Instance
    Properties:
      InstanceType: t2.small
      ImageId: ami-064e916063a94c38f # ami bitnami redis image id
      Monitoring: true
      SecurityGroupIds:
        - !Ref EC2SecurityGroup
      UserData:
        "Fn::Base64": !Sub |
          #!/bin/bash
          /opt/bitnami/ctlscript.sh stop redis
          password="$(grep -oP '(?<=requirepass )\w+' /opt/bitnami/redis/etc/redis.conf)"
          echo $password
          sed -i "s/$password/${RedisPassword}/g" /opt/bitnami/redis/etc/redis.conf
          /opt/bitnami/ctlscript.sh start redis
  RedisEc2EIP:
    Type: AWS::EC2::EIP
    Properties:
      InstanceId: !Ref RedisEc2Instance
  EC2SecurityGroup:
    Type: AWS::EC2::SecurityGroup
    Properties:
      GroupDescription: Redis securtiy group
      SecurityGroupIngress:
        - IpProtocol: tcp
          FromPort: 6379
          ToPort: 6379
          CidrIp: 0.0.0.0/0
Outputs:
  EC2PublicIp:
    Description:  Public IP address of the specified instances
    Value: !GetAtt RedisEc2Instance.PublicIp
  EC2PublicDnsName:
    Description: Public DNS name of the specified instances
    Value: !GetAtt RedisEc2Instance.PublicDnsName