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As an example query AWS for a list of all NAT Instance AMIs:

aws ec2 describe-images --filter Name="owner-alias",Values="amazon" --filter Name="name",Values="amzn-ami-vpc-nat*" --region us-west-2 | jq '.Images | sort_by(.CreationDate)'

If only specific fields are required to print into output:

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Query the instance metadata using curl and parse the output with jq tool

curl --silent http://169.254.169.254/latest/dynamic/instance-identity/document | jq -r .region

Example Output:

us-east-1

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Local SSH Port Forwarding

To start local forwarding, use the below command which will forward connections from local port 9001 to localhost:3306 on example.com server.

ssh -N -L 9001:localhost:3306 username@example.com

To connect with the destination, use localhost:9001 on local machine.

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The best practice is to run one worker process per core - it is defined by worker_processes directive. To verify how many cores is your machine running execute the grep processor /proc/cpuinfo | wc -l command. The worker_connections however specify how many simultaneous connections can be opened by a worker process (default value for nginx is 512).

Each docker aplications are defined in upstream directives. The request with URI /app1/ will be proxied to docker-app1, however the request with URI /app2/ will be proxied to docker-app2.

worker_processes 1;

events { 

    worker_connections 1024; 

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List all existing S3 buckets

Using root access keys run the aws s3api list-buckets command to return list of S3 buckets

Example Output:

{
    "Owner": {
        "DisplayName": "<OwnerName>",