ECS logs

gistfile1.txt

#!/bin/bash

function logs {
    # Parameters: Cluster Name and Service Name
    local cluster_name="$1"
    local service_name="$2"

    echo "Retrieving tasks for ECS service '$service_name' in cluster '$cluster_name'..."

    # 1. List Tasks for the Service
    local tasks=$(aws ecs list-tasks --cluster "$cluster_name" --service-name "$service_name" --query 'taskArns' --output text)
    if [ -z "$tasks" ]; then
        echo "No tasks found for service $service_name."
        return 1
    fi

    # 2. Describe the Tasks to get Task Definitions
    echo "Describing tasks..."
    local task_definitions=$(aws ecs describe-tasks --cluster "$cluster_name" --tasks $tasks --query 'tasks[].taskDefinitionArn' --output text)
    
    # 3. Get Log Configuration from Task Definitions
    local log_group_name log_stream_prefix
    for task_def in $task_definitions; do
        log_group_name=$(aws ecs describe-task-definition --task-definition "$task_def" --query 'taskDefinition.containerDefinitions[].logConfiguration.options."awslogs-group"' --output text)
        log_stream_prefix=$(aws ecs describe-task-definition --task-definition "$task_def" --query 'taskDefinition.containerDefinitions[].logConfiguration.options."awslogs-stream-prefix"' --output text)

        # 4. Retrieve and Print Logs for each Task
        for task_id in $tasks; do
            local log_stream_name=$(aws logs describe-log-streams --log-group-name "$log_group_name" --log-stream-name-prefix "$log_stream_prefix" --query 'logStreams[0].logStreamName' --output text)

            if [ "$log_stream_name" != "None" ]; then
                echo "Logs for task $task_id:"
                aws logs get-log-events --log-group-name "$log_group_name" --log-stream-name "$log_stream_name" --start-from-head | jq -r '.events[].message'
            else
                echo "No logs found for task $task_id."
            fi
        done
    done
}