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feat(ec2): default BastionHostLinux to use Amazon Linux 2023 (under f…
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…eature flag) (#31996)

### Issue #29493

Closes #29493

### Reason for this change

Right now, if a `machineImage` property isn't passed to `BastionHostLinux`, it defaults to an Amazon Linux 2 image. Since Amazon Linux 2 is hitting end-of-life in June 2025, it'd be better to default to Amazon Linux 2023.

Since changing this default would be a breaking change, I placed it behind a feature flag, `@aws-cdk/aws-ec2:bastionHostUseAmazonLinux2023ByDefault`.

### Description of changes

- Added the `@aws-cdk/aws-ec2:bastionHostUseAmazonLinux2023ByDefault`
- When set, and a `machineImage` is not provided, we use the latest Amazon Linux 2023 image, instead of Amazon Linux 2.

### Description of how you validated changes

- Unit Tests
- Integration Test

### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*
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blimmer authored Dec 2, 2024

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Original file line number Diff line number Diff line change
@@ -18,9 +18,6 @@
"VPCPublicSubnet1SubnetB4246D30": {
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"Properties": {
"VpcId": {
"Ref": "VPCB9E5F0B4"
},
"AvailabilityZone": {
"Fn::Select": [
0,
@@ -44,21 +41,24 @@
"Key": "Name",
"Value": "TestStack/VPC/PublicSubnet1"
}
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],
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},
"VPCPublicSubnet1RouteTableAssociation0B0896DC": {
@@ -75,12 +75,12 @@
"VPCPublicSubnet1DefaultRoute91CEF279": {
"Type": "AWS::EC2::Route",
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"Ref": "VPCPublicSubnet1RouteTableFEE4B781"
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"GatewayId": {
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"RouteTableId": {
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}
},
"DependsOn": [
@@ -102,15 +102,15 @@
"VPCPublicSubnet1NATGatewayE0556630": {
"Type": "AWS::EC2::NatGateway",
"Properties": {
"SubnetId": {
"Ref": "VPCPublicSubnet1SubnetB4246D30"
},
"AllocationId": {
"Fn::GetAtt": [
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},
"SubnetId": {
"Ref": "VPCPublicSubnet1SubnetB4246D30"
},
"Tags": [
{
"Key": "Name",
@@ -126,9 +126,6 @@
"VPCPublicSubnet2Subnet74179F39": {
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1,
@@ -152,21 +149,24 @@
"Key": "Name",
"Value": "TestStack/VPC/PublicSubnet2"
}
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],
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"VPCPublicSubnet2RouteTable6F1A15F1": {
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}
},
"VPCPublicSubnet2RouteTableAssociation5A808732": {
@@ -183,12 +183,12 @@
"VPCPublicSubnet2DefaultRouteB7481BBA": {
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"Properties": {
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},
"DependsOn": [
@@ -210,15 +210,15 @@
"VPCPublicSubnet2NATGateway3C070193": {
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"Properties": {
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"Tags": [
{
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@@ -234,9 +234,6 @@
"VPCPrivateSubnet1Subnet8BCA10E0": {
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"AvailabilityZone": {
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0,
@@ -260,21 +257,24 @@
"Key": "Name",
"Value": "TestStack/VPC/PrivateSubnet1"
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"VPCPrivateSubnet1RouteTableAssociation347902D1": {
@@ -291,21 +291,18 @@
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"VPCPrivateSubnet2SubnetCFCDAA7A": {
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},
"AvailabilityZone": {
"Fn::Select": [
1,
@@ -329,21 +326,24 @@
"Key": "Name",
"Value": "TestStack/VPC/PrivateSubnet2"
}
]
],
"VpcId": {
"Ref": "VPCB9E5F0B4"
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"VPCPrivateSubnet2RouteTable0A19E10E": {
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"VpcId": {
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},
"VPCPrivateSubnet2RouteTableAssociation0C73D413": {
@@ -360,12 +360,12 @@
"VPCPrivateSubnet2DefaultRouteF4F5CFD2": {
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},
@@ -383,11 +383,11 @@
"VPCVPCGW99B986DC": {
"Type": "AWS::EC2::VPCGatewayAttachment",
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"InternetGatewayId": {
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}
},
@@ -486,7 +486,7 @@
"Ref": "BastionHostInstanceProfile770FCA07"
},
"ImageId": {
"Ref": "SsmParameterValueawsserviceamiamazonlinuxlatestamzn2amikernel510hvmarm64gp2C96584B6F00A464EAD1953AFF4B05118Parameter"
"Ref": "SsmParameterValueawsserviceamiamazonlinuxlatestal2023amikernel61arm64C96584B6F00A464EAD1953AFF4B05118Parameter"
},
"InstanceType": "t4g.nano",
"SecurityGroupIds": [
@@ -525,9 +525,9 @@
}
},
"Parameters": {
"SsmParameterValueawsserviceamiamazonlinuxlatestamzn2amikernel510hvmarm64gp2C96584B6F00A464EAD1953AFF4B05118Parameter": {
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"Type": "AWS::SSM::Parameter::Value<AWS::EC2::Image::Id>",
"Default": "/aws/service/ami-amazon-linux-latest/amzn2-ami-kernel-5.10-hvm-arm64-gp2"
"Default": "/aws/service/ami-amazon-linux-latest/al2023-ami-kernel-6.1-arm64"
},
"BootstrapVersion": {
"Type": "AWS::SSM::Parameter::Value<String>",

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