Automated install of Cloudwatch agent in Amazon Linux

cw-agent-install.sh

yum install -y wget

wget https://s3.amazonaws.com/amazoncloudwatch-agent/assets/amazon-cloudwatch-agent.gpg -qP /tmp/cwagent

# Key value check
key_value=$(gpg --import /tmp/cwagent/amazon-cloudwatch-agent.gpg |& grep -Po '(3B789C72)')
if [ "$key_value" = "3B789C72" ]; then
    echo "Good key value, proceeding."
    # Public key fingerprint check
    key_fingerprint=$(gpg --fingerprint $key_value |& grep -Po '(9376 16F3 450B 7D80 6CBD  9725 D581 6730 3B78 9C72)')
    if [ "$key_fingerprint" = "9376 16F3 450B 7D80 6CBD  9725 D581 6730 3B78 9C72" ]; then
        echo "Good key fingerprint, proceeding."
        #Signature
        wget https://s3.amazonaws.com/amazoncloudwatch-agent/amazon_linux/amd64/latest/amazon-cloudwatch-agent.rpm.sig -qP /tmp/cwagent 1> /dev/null

        #Download package
        wget https://s3.amazonaws.com/amazoncloudwatch-agent/amazon_linux/amd64/latest/amazon-cloudwatch-agent.rpm -qP /tmp/cwagent 1> /dev/null
        # Package signature check
        verification_response=$(gpg --verify /tmp/cwagent/amazon-cloudwatch-agent.rpm.sig /tmp/cwagent/amazon-cloudwatch-agent.rpm |& grep -Po '(Good signature)')
        if [ "$verification_response" = "Good signature" ]; then
            echo "Good signature, proceeding."
        else 
            echo "BAD signature, can't proceed."
        fi
    else 
        echo "BAD key fingerprint, can't proceed."
    fi
else 
    echo "BAD key value, can't proceed."
fi


# Unpack package
rpm -U /tmp/cwagent/amazon-cloudwatch-agent.rpm

yum remove -y wget

touch /opt/aws/amazon-cloudwatch-agent/etc/amazon-cloudwatch-agent.json

# Add your custom .json here, this one is to push RAM usage of the server to CW.
cat <<EOF > /opt/aws/amazon-cloudwatch-agent/etc/amazon-cloudwatch-agent.json
{
    "agent": {
    "metrics_collection_interval": 10,
    "logfile": "/opt/aws/amazon-cloudwatch-agent/logs/amazon-cloudwatch-agent.log"
    },
    "metrics": {
    "namespace": "CWAgent/Silos/EC2",
    "metrics_collected": {
        "mem": {
            "measurement": [
                {"name": "used_percent", "rename": "Memory used percent", "unit": "Megabytes"}
            ],
            "metrics_collection_interval": 60
        }
    },
    "append_dimensions": {
        "InstanceId": "\${aws:InstanceId}"
    },
    "aggregation_dimensions" : [["ImageId"]],
    "force_flush_interval" : 30
    }
}
EOF

sudo /opt/aws/amazon-cloudwatch-agent/bin/amazon-cloudwatch-agent-ctl -a fetch-config -m ec2 -s -c file:/opt/aws/amazon-cloudwatch-agent/etc/amazon-cloudwatch-agent.json