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Run the following commands to connect to the EC2 instance. First, you need to install CloudWatch Agent from S3. Use the below command to download it for AMD64 Ubuntu.

$ wget https://s3.amazonaws.com/amazoncloudwatch-agent/ubuntu/amd64/latest/amazon-cloudwatch-agent.deb

Use the following command to install the Agent:

$ sudo dpkg -i -E ./amazon-cloudwatch-agent.deb

After installing the CloudWatch Agent, the user needs to be configured before it can be started. It can be configured in two ways: by manually creating a config file or using the wizard (In which the user needs to answer a series of questions). It generates a config file.

Install Manually create config.json

The log agent uses the config file located at the below path:

/opt/aws/amazon-cloudwatch-agent/bin/config.json

From the above path, create or edit the config file with the following content:

{
     "agent": {
         "run_as_user": "root"
     },
     "logs": {
         "logs_collected": {
             "files": {
                 "collect_list": [
                     {
                         "file_path": "/var/log/apache2/error.log",
                         "log_group_name": "apache-error-log",
                         "log_stream_name": "{instance_id}"
                     }
                 ]
             }
         }
     }
 }