AWS CLI

Essential AWS CLI commands and patterns.

Configuration

# Initial setup
aws configure
# Enter: Access Key ID, Secret Access Key, Region, Output format

# Named profiles
aws configure --profile staging
aws configure --profile production

# Use profile
aws s3 ls --profile production
export AWS_PROFILE=production  # Set default

# Check identity
aws sts get-caller-identity

# Config files
# ~/.aws/credentials - Access keys
# ~/.aws/config     - Region, output, role settings

Profile with Role Assumption

# ~/.aws/config
[profile dev]
region = us-east-1
output = json

[profile prod]
role_arn = arn:aws:iam::123456789:role/AdminRole
source_profile = dev
region = us-east-1

S3

# List buckets/objects
aws s3 ls
aws s3 ls s3://my-bucket/
aws s3 ls s3://my-bucket/prefix/ --recursive

# Copy files
aws s3 cp file.txt s3://my-bucket/
aws s3 cp s3://my-bucket/file.txt ./
aws s3 cp s3://bucket1/file s3://bucket2/file

# Sync directory
aws s3 sync ./dist s3://my-bucket/
aws s3 sync ./dist s3://my-bucket/ --delete  # Mirror (removes extras)
aws s3 sync s3://my-bucket/ ./local/

# With filters
aws s3 sync . s3://bucket/ --exclude "*.log" --include "*.txt"

# Remove
aws s3 rm s3://my-bucket/file.txt
aws s3 rm s3://my-bucket/ --recursive  # Empty bucket

# Presigned URL (temporary access)
aws s3 presign s3://my-bucket/file.txt --expires-in 3600

# Bucket operations
aws s3 mb s3://new-bucket
aws s3 rb s3://empty-bucket

EC2

# List instances
aws ec2 describe-instances
aws ec2 describe-instances --filters "Name=tag:Name,Values=web-*"
aws ec2 describe-instances --query 'Reservations[].Instances[].[InstanceId,State.Name,PublicIpAddress]' --output table

# Start/stop
aws ec2 start-instances --instance-ids i-1234567890abcdef0
aws ec2 stop-instances --instance-ids i-1234567890abcdef0
aws ec2 reboot-instances --instance-ids i-1234567890abcdef0

# SSH key pairs
aws ec2 create-key-pair --key-name my-key --query 'KeyMaterial' --output text > my-key.pem
chmod 400 my-key.pem

# Security groups
aws ec2 describe-security-groups
aws ec2 authorize-security-group-ingress \
  --group-id sg-123 \
  --protocol tcp \
  --port 443 \
  --cidr 0.0.0.0/0

Lambda

# List functions
aws lambda list-functions

# Invoke function
aws lambda invoke --function-name my-func --payload '{"key":"value"}' output.json

# Deploy (zip)
zip -r function.zip .
aws lambda update-function-code \
  --function-name my-func \
  --zip-file fileb://function.zip

# View logs
aws logs tail /aws/lambda/my-func --follow
aws logs tail /aws/lambda/my-func --since 1h

# Environment variables
aws lambda update-function-configuration \
  --function-name my-func \
  --environment "Variables={KEY=value,DB_HOST=localhost}"

IAM

# Users
aws iam list-users
aws iam create-user --user-name deploy-bot
aws iam create-access-key --user-name deploy-bot

# Policies
aws iam list-attached-user-policies --user-name alice
aws iam attach-user-policy \
  --user-name deploy-bot \
  --policy-arn arn:aws:iam::aws:policy/AmazonS3ReadOnlyAccess

# Roles
aws iam list-roles
aws iam get-role --role-name my-role

CloudWatch

# View log groups
aws logs describe-log-groups

# Tail logs
aws logs tail /ecs/my-service --follow --since 30m

# Filter logs
aws logs filter-log-events \
  --log-group-name /ecs/my-service \
  --filter-pattern "ERROR"

ECS

# List clusters/services
aws ecs list-clusters
aws ecs list-services --cluster my-cluster
aws ecs describe-services --cluster my-cluster --services my-service

# Force new deployment
aws ecs update-service --cluster my-cluster --service my-service --force-new-deployment

# View tasks
aws ecs list-tasks --cluster my-cluster --service my-service
aws ecs describe-tasks --cluster my-cluster --tasks <task-arn>

# Exec into container
aws ecs execute-command --cluster my-cluster --task <task-id> --container my-app --interactive --command "/bin/sh"

Useful Flags

# Output formats
--output json     # Default
--output table    # Human-readable
--output text     # Tab-separated
--output yaml

# Query (JMESPath)
--query 'Reservations[].Instances[].InstanceId'
--query 'length(Reservations[])'

# Dry run
--dry-run

# Region override
--region us-west-2

# Wait for state
aws ec2 wait instance-running --instance-ids i-123
aws ecs wait services-stable --cluster my-cluster --services my-service

Reference

For S3 patterns:

references/s3.md

For EC2 management:

references/ec2.md

For Lambda functions:

references/lambda.md