stop-services-rerun-in-all-instances

#!/bin/bash
REVISION=$(aws ecs list-task-definitions --family-prefix $AWS_ECS_CONTAINER_NAME | jq '.taskDefinitionArns[]' | tr -d '"' | tail -1 | rev | cut -d':' -f 1 | rev)

if [ ! -z "$REVISION" ]; then
  aws ecs deregister-task-definition \
    --region $AWS_DEFAULT_REGION \
    --task-definition $AWS_ECS_CONTAINER_NAME:$REVISION \
    >> /dev/null

  # Prevent ecs to restart the task to update new code
  aws ecs update-service \
    --cluster $AWS_ECS_CLUSTER_NAME \
    --service $AWS_ECS_CONTAINER_NAME \
    --desired-count 0\
    --placement-constraints "[]" \
    --placement-strategy "[]" >> /dev/null

  # Stop current task that is running our application.
  # This is what will stop the application.
  ecs-cli compose \
    --file $COMPOSE_FILE \
    --project-name "$AWS_ECS_CONTAINER_NAME" \
    service stop
fi

# Start new task which will create fresh new task definition as well.
# This is what brings the application up with the new changes and configurations.
ecs-cli compose \
  --file $COMPOSE_FILE \
  --project-name "$AWS_ECS_CONTAINER_NAME" \
  service up
  
INSTANCES_COUNT=$(aws ecs list-container-instances --cluster $AWS_ECS_CLUSTER_NAME | jq '.containerInstanceArns | length')

# Configure tasks to spread all instances
aws ecs update-service \
  --cluster $AWS_ECS_CLUSTER_NAME \
  --service $AWS_ECS_CONTAINER_NAME \
  --desired-count $INSTANCES_COUNT \
  --placement-constraints type="distinctInstance" \
  --placement-strategy type="spread",field="instanceId" >> /dev/null

# Scale to run tasks in all instances
ecs-cli compose \
  --file $COMPOSE_FILE \
  --project-name "$AWS_ECS_CONTAINER_NAME" \
  service scale $INSTANCES_COUNT