fix(aws-ecs): fix default daemon deploymentConfig values (#2210)

Fixes #2209

Author: SoManyHs

packages/@aws-cdk/aws-ecs/lib/base/base-service.ts

@@ -38,7 +38,7 @@ export interface BaseServiceProps {
    * service's DesiredCount value, that can run in a service during a
    * deployment.
    *
-   * @default 200
+   * @default 100 if daemon, otherwise 200
    */
   readonly maximumPercent?: number;
 
@@ -47,7 +47,7 @@ export interface BaseServiceProps {
    * the Amazon ECS service's DesiredCount value, that must
    * continue to run and remain healthy during a deployment.
    *
-   * @default 50
+   * @default 0 if daemon, otherwise 50
    */
   readonly minimumHealthyPercent?: number;
 

packages/@aws-cdk/aws-ecs/lib/ec2/ec2-service.ts

@@ -70,6 +70,14 @@ export class Ec2Service extends BaseService implements elb.ILoadBalancerTarget {
       throw new Error('Daemon mode launches one task on every instance. Don\'t supply desiredCount.');
     }
 
+    if (props.daemon && props.maximumPercent !== undefined && props.maximumPercent !== 100) {
+      throw new Error('Maximum percent must be 100 for daemon mode.');
+    }
+
+    if (props.daemon && props.minimumHealthyPercent !== undefined && props.minimumHealthyPercent !== 0) {
+      throw new Error('Minimum healthy percent must be 0 for daemon mode.');
+    }
+
     if (!isEc2Compatible(props.taskDefinition.compatibility)) {
       throw new Error('Supplied TaskDefinition is not configured for compatibility with EC2');
     }
@@ -78,6 +86,8 @@ export class Ec2Service extends BaseService implements elb.ILoadBalancerTarget {
       ...props,
       // If daemon, desiredCount must be undefined and that's what we want. Otherwise, default to 1.
       desiredCount: props.daemon || props.desiredCount !== undefined ? props.desiredCount : 1,
+      maximumPercent: props.daemon && props.maximumPercent === undefined ? 100 : props.maximumPercent,
+      minimumHealthyPercent: props.daemon && props.minimumHealthyPercent === undefined ? 0 : props.minimumHealthyPercent ,
     },
     {
       cluster: props.cluster.clusterName,

packages/@aws-cdk/aws-ecs/test/ec2/test.ec2-service.ts

@@ -75,6 +75,56 @@ export = {
       test.done();
     },
 
+    "errors if daemon and maximumPercent not 100"(test: Test) {
+      // GIVEN
+      const stack = new cdk.Stack();
+      const vpc = new ec2.VpcNetwork(stack, 'MyVpc', {});
+      const cluster = new ecs.Cluster(stack, 'EcsCluster', { vpc });
+      cluster.addCapacity('DefaultAutoScalingGroup', { instanceType: new ec2.InstanceType('t2.micro') });
+      const taskDefinition = new ecs.Ec2TaskDefinition(stack, 'Ec2TaskDef');
+      taskDefinition.addContainer('BaseContainer', {
+        image: ecs.ContainerImage.fromRegistry('test'),
+        memoryReservationMiB: 10,
+      });
+
+      // THEN
+      test.throws(() => {
+        new ecs.Ec2Service(stack, "Ec2Service", {
+          cluster,
+          taskDefinition,
+          daemon: true,
+          maximumPercent: 300
+        });
+      }, /Maximum percent must be 100 for daemon mode./);
+
+      test.done();
+    },
+
+    "errors if daemon and minimum not 0"(test: Test) {
+      // GIVEN
+      const stack = new cdk.Stack();
+      const vpc = new ec2.VpcNetwork(stack, 'MyVpc', {});
+      const cluster = new ecs.Cluster(stack, 'EcsCluster', { vpc });
+      cluster.addCapacity('DefaultAutoScalingGroup', { instanceType: new ec2.InstanceType('t2.micro') });
+      const taskDefinition = new ecs.Ec2TaskDefinition(stack, 'Ec2TaskDef');
+      taskDefinition.addContainer('BaseContainer', {
+        image: ecs.ContainerImage.fromRegistry('test'),
+        memoryReservationMiB: 10,
+      });
+
+      // THEN
+      test.throws(() => {
+        new ecs.Ec2Service(stack, "Ec2Service", {
+          cluster,
+          taskDefinition,
+          daemon: true,
+          minimumHealthyPercent: 50
+        });
+      }, /Minimum healthy percent must be 0 for daemon mode./);
+
+      test.done();
+    },
+
     'Output does not contain DesiredCount if daemon mode is set'(test: Test) {
       // GIVEN
       const stack = new cdk.Stack();
@@ -141,7 +191,11 @@ export = {
 
       // THEN
       expect(stack).to(haveResource("AWS::ECS::Service", {
-        SchedulingStrategy: "DAEMON"
+        SchedulingStrategy: "DAEMON",
+        DeploymentConfiguration: {
+          MaximumPercent: 100,
+          MinimumHealthyPercent: 0
+        },
       }));
 
       test.done();