Intro
I deployed my first two services to AWS Fargate earlier this month --a node/typescript websocket server and a fastapi python microservice. But this post isn't about either service, it's about shell scripting as indicated by the title.
Get information about all configured services in one script
As a sanity measure, I highly recommend using a script similar to the one included below to pull info for all services/instances you have configured with aws. Before doing so, ensure you have the aws cli installed and your credentials stored in ~/.aws/credentials and/or ~/.aws/config if using Mac or Linux, else store them in %USERPROFILE%\.aws\credentials and %USERPROFILE%\.aws\config if using Windows. Tip: If you're using WSL2 like me, you'll likely want to keep this in your WSL2 distro environment (using the linux/mac locations for your credentials and for installing the aws cli, too).
The local shell script I slapped together that I run each time I want to pull information on all of my aws provisioned infra -- handy to use as a starting point for additional shell-based tasks, especially if configuring CI/CD with github or gitlab. Feel free to overhaul it to meet your needs:
#!/usr/bin/env bash set -euo pipefail mkdir -p remote/describe/{cluster,service,taskdef,tg,lb,listeners,repository,image,sg,subnets} REGION=us-east-1 REPO_ARNS=$( aws ecr describe-repositories --region "$REGION" | jq -r '.repositories[].repositoryArn' ) for REPO_ARN in $REPO_ARNS; do REPO=${REPO_ARN##*/} echo "→ Describing ECR repo $REPO" aws ecr describe-repositories \ --repository-names "$REPO" \ --region "$REGION" \ >remote/describe/repository/"$REPO".json aws ecr describe-images \ --repository-name "$REPO" \ --region "$REGION" \ >remote/describe/image/"$REPO".json done CLUSTER_ARNS=$(aws ecs list-clusters \ --region "$REGION" | jq -r '.clusterArns[]') for CLUSTER_ARN in $CLUSTER_ARNS; do CLUSTER_NAME=${CLUSTER_ARN##*/} echo "→ Using cluster: $CLUSTER_ARN" aws ecs describe-clusters \ --clusters "$CLUSTER_ARN" \ --region "$REGION" \ >remote/describe/cluster/"$CLUSTER_NAME".json SERVICE_ARNS=$(aws ecs list-services \ --cluster "$CLUSTER_ARN" \ --region "$REGION" | jq -r '.serviceArns[]') for ARN in $SERVICE_ARNS; do NAME=${ARN##*/} echo "→ Describing service $NAME ($ARN)" aws ecs describe-services \ --cluster "$CLUSTER_ARN" \ --services "$NAME" \ --region "$REGION" \ >remote/describe/service/"$NAME".json TASK_DEF_ARN=$(jq -r '.services[0].taskDefinition' remote/describe/service/"$NAME".json) aws ecs describe-task-definition \ --task-definition "$TASK_DEF_ARN" \ --region us-east-1 >remote/describe/taskdef/"$NAME".json TG_ARN=$(jq -r '.services[0].loadBalancers[0].targetGroupArn' remote/describe/service/"$NAME".json) aws elbv2 describe-target-groups \ --target-group-arns "$TG_ARN" \ --region us-east-1 >remote/describe/tg/"$NAME".json LB_ARN=$(jq -r '.TargetGroups[0].LoadBalancerArns[0]' remote/describe/tg/"$NAME".json) aws elbv2 describe-load-balancers \ --load-balancer-arns "$LB_ARN" \ --region us-east-1 >remote/describe/lb/"$NAME".json aws elbv2 describe-listeners \ --load-balancer-arn "$LB_ARN" \ --region us-east-1 >remote/describe/listeners/"$NAME".json SECURITY_GROUP=$(jq -r '.services[0].networkConfiguration.awsvpcConfiguration.securityGroups | join(" ")' remote/describe/service/"$NAME".json) aws ec2 describe-security-groups \ --group-ids "$SECURITY_GROUP" \ --region "$REGION" >remote/describe/sg/"$NAME".json SUBNET_IDS=$(jq -r '.services[0].networkConfiguration.awsvpcConfiguration.subnets[]' remote/describe/service/"$NAME".json) for SUBNET_ID in $SUBNET_IDS; do mkdir -p remote/describe/subnets/"$NAME" aws ec2 describe-subnets \ --subnet-ids "$SUBNET_ID" \ >remote/describe/subnets/"$NAME"/"$SUBNET_ID".json done done done make sure to run chmod+x filename.sh to make it executable
this will output directories containing files similar to the ones shown in this screenshot
I also strongly recommend adding remote/**/*.json to your gitignore file since you definitely don't want these to be publicly viewable
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