Initial Commit

AWSCookbook · Jan 27, 2022 · acedad6 · acedad6
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-# HerbsAndSpices
+# HerbsAndSpices
+
+These useful small bits of code will help you save time and get the most out of AWS.
+
+Set your `AWS_ACCOUNT_ID` to a bash variable:
+
+```
+export AWS_ACCOUNT_ID=$(aws sts get-caller-identity \
+--query Account --output text)
+```
+
+Get the most recently created CloudWatch log group name:
+```
+aws logs describe-log-groups --output=yaml \
+--query 'reverse(sort_by(logGroups,&creationTime))[:1].{Name:logGroupName}'
+```
+
+Tail the logs for the CloudWatch group:
+```
+aws logs tail <<LOGGROUPNAME>> --follow --since 10s
+```
+
+Delete all log groups that match a text pattern and prompt yes/no for confirmation:
+```
+aws logs describe-log-groups | \
+jq ".logGroups[].logGroupName" | grep -i <<pattern>> | \
+xargs -p -I % aws logs delete-log-group --log-group-name %
+```
+
+Stop all running instances for your current working Region (H/T: Curtis Rissi):
+```
+aws ec2 stop-instances \
+--instance-ids $(aws ec2 describe-instances \
+--filters "Name=instance-state-name,Values=running" --query "Reservations[].Instances[].[InstanceId]"
+--output text | tr '\n' ' ')
+```
+
+Determine the user making CLI calls:
+```
+aws sts get-caller-identity --query UserId --output text
+```
+
+Generate YAML input for your CLI command and use it:
+```
+aws ec2 create-vpc --generate-cli-skeleton yaml-input > input.yaml
+#Edit input.yaml - at a minimum modify CidrBlock, DryRun, ResourceType, and Tags
+aws ec2 create-vpc --cli-input-yaml file://input.yaml
+```
+
+List the AWS Region names and endpoints in a table format:
+```
+aws ec2 describe-regions --output table
+```
+
+Find interface VPC endpoints for the Region you are currently using:
+```
+aws ec2 describe-vpc-endpoint-services \
+--query ServiceDetails[*].ServiceName
+```
+
+Populate data into a DynamoDB table:
+```
+aws ddb put table_name '[{key1: value1}, {key2: value2}]'
+```
+
+Determine the current supported versions for a particular database engine (e.g., aurora-postgresql):
+```
+aws rds describe-db-engine-versions --engine aurora-postgresql \
+--query "DBEngineVersions[].EngineVersion"
+```
+
+Delete network interfaces associated with a security group and prompt for each delete (answer yes/no to delete or skip):
+```
+aws ec2 describe-network-interfaces \
+--filters Name=group-id,Values=$SecurityGroup \
+--query NetworkInterfaces[*].NetworkInterfaceId \
+--output text | tr '\t' '\n' | xargs -p -I % \
+aws ec2 delete-network-interface --network-interface-id %
+```
+
+Find your default VPC (if you have one) for a Region:
+```
+aws ec2 describe-vpcs --vpc-ids \
+--query 'Vpcs[?IsDefault==`true`]'
+```
+
+Enable encryption by default for new EBS volumes in a Region:
+```
+aws ec2 enable-ebs-encryption-by-default
+```
+
+List all AWS Regions:
+```
+aws ssm get-parameters-by-path \
+--path /aws/service/global-infrastructure/regions \
+--output text --query Parameters[*].Name | tr "\t" "\n"
+```
+
+List all AWS services:
+```
+aws ssm get-parameters-by-path \
+--path /aws/service/global-infrastructure/services \
+--output text --query Parameters[*].Name \
+| tr "\t" "\n" | awk -F "/" '{ print $6 }'
+```
+
+List all services available in a region (e.g., us-east-1):
+```
+aws ssm get-parameters-by-path \
+--path /aws/service/global-infrastructure/regions/us-east-1/services \
+--output text --query Parameters[*].Name | tr "\t" "\n" \
+| awk -F "/" '{ print $8 }'
+```
+
+List all Regions that have a particular service available (e.g., SNS):
+```
+aws ssm get-parameters-by-path \
+--path /aws/service/global-infrastructure/services/sns/regions \
+--output text --query Parameters[*].Value | tr "\t" "\n"
+```
+
+Create a presigned URL for an object in S3 that expires in a week:
+```
+aws s3 presign s3://<<BucketName>>/<<FileName>> \
+--expires-in 604800
+```
+
+Find Availability Zone IDs for a Region that are consistent across accounts:
+```
+aws ec2 describe-availability-zones --region $AWS_REGION
+```
+
+Set the Region by grabbing the value from an EC2 instance’s metadata:
+```
+export AWS_DEFAULT_REGION=$(curl --silent http://169.254.169.254/latest/dynamic/instance-
+identity/document \
+| awk -F'"' ' /region/ {print $4}')
+```