Step: ipi-conf-aws-blackholenetwork

The IPI AWS blackholenetwork configure step generates the AWS-specific install-config.yaml contents based on the cluster profile and optional input files using subnets where the private ones do not have direct egress access.

Container image used for this step: ocp/4.5:upi-installer

ocp/4.5:upi-installer resolves to an image imported from the specified imagestream tag on the build farm (documentation).

Environment

In addition to the default environment, the step exposes the following:

Variable Name Type Variable Content
ZONES_COUNT Parameter[?] The number of Availability Zones to present in the cluster. Accepted values are 1, 2, and 3. (default: 2)

Source Code

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#!/bin/bash

set -o nounset
set -o errexit
set -o pipefail

export AWS_SHARED_CREDENTIALS_FILE="${CLUSTER_PROFILE_DIR}/.awscred"

# TODO: move to image
curl -L https://github.com/mikefarah/yq/releases/download/3.3.0/yq_linux_amd64 -o /tmp/yq && chmod +x /tmp/yq

function join_by { local IFS="$1"; shift; echo "$*"; }

EXPIRATION_DATE=$(date -d '4 hours' --iso=minutes --utc)
TAGS="Key=expirationDate,Value=${EXPIRATION_DATE}"

CONFIG="${SHARED_DIR}/install-config.yaml"
PATCH=/tmp/install-config-blackholenetwork.yaml.patch

REGION="${LEASED_RESOURCE}"

CLUSTER_NAME="$(/tmp/yq r "${CONFIG}" 'metadata.name')"

cat << EOF > /tmp/blackhole_vpc.yaml
# This is the template file used to generate blackhole VPC and subnet entries.
AWSTemplateFormatVersion: 2010-09-09
Description: Template for Best Practice VPC with 1-3 AZs

Parameters:
  VpcCidr:
    AllowedPattern: ^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])(\/(1[6-9]|2[0-4]))$
    ConstraintDescription: CIDR block parameter must be in the form x.x.x.x/16-24.
    Default: 10.0.0.0/16
    Description: CIDR block for VPC.
    Type: String
  AvailabilityZoneCount:
    ConstraintDescription: "The number of availability zones. (Min: 1, Max: 3)"
    MinValue: 1
    MaxValue: 3
    Default: 1
    Description: "How many AZs to create VPC subnets for. (Min: 1, Max: 3)"
    Type: Number
  SubnetBits:
    ConstraintDescription: CIDR block parameter must be in the form x.x.x.x/19-27.
    MinValue: 5
    MaxValue: 13
    Default: 12
    Description: "Size of each subnet to create within the availability zones. (Min: 5 = /27, Max: 13 = /19)"
    Type: Number

Metadata:
  AWS::CloudFormation::Interface:
    ParameterGroups:
    - Label:
        default: "Network Configuration"
      Parameters:
      - VpcCidr
      - SubnetBits
    - Label:
        default: "Availability Zones"
      Parameters:
      - AvailabilityZoneCount
    ParameterLabels:
      AvailabilityZoneCount:
        default: "Availability Zone Count"
      VpcCidr:
        default: "VPC CIDR"
      SubnetBits:
        default: "Bits Per Subnet"

Conditions:
  DoAz3: !Equals [3, !Ref AvailabilityZoneCount]
  DoAz2: !Or [!Equals [2, !Ref AvailabilityZoneCount], Condition: DoAz3]

Resources:
  VPC:
    Type: "AWS::EC2::VPC"
    Properties:
      EnableDnsSupport: "true"
      EnableDnsHostnames: "true"
      CidrBlock: !Ref VpcCidr
  PublicSubnet:
    Type: "AWS::EC2::Subnet"
    Properties:
      VpcId: !Ref VPC
      CidrBlock: !Select [0, !Cidr [!Ref VpcCidr, 6, !Ref SubnetBits]]
      AvailabilityZone: !Select
      - 0
      - Fn::GetAZs: !Ref "AWS::Region"
  PublicSubnet2:
    Type: "AWS::EC2::Subnet"
    Condition: DoAz2
    Properties:
      VpcId: !Ref VPC
      CidrBlock: !Select [1, !Cidr [!Ref VpcCidr, 6, !Ref SubnetBits]]
      AvailabilityZone: !Select
      - 1
      - Fn::GetAZs: !Ref "AWS::Region"
  PublicSubnet3:
    Type: "AWS::EC2::Subnet"
    Condition: DoAz3
    Properties:
      VpcId: !Ref VPC
      CidrBlock: !Select [2, !Cidr [!Ref VpcCidr, 6, !Ref SubnetBits]]
      AvailabilityZone: !Select
      - 2
      - Fn::GetAZs: !Ref "AWS::Region"
  InternetGateway:
    Type: "AWS::EC2::InternetGateway"
  GatewayToInternet:
    Type: "AWS::EC2::VPCGatewayAttachment"
    Properties:
      VpcId: !Ref VPC
      InternetGatewayId: !Ref InternetGateway
  PublicRouteTable:
    Type: "AWS::EC2::RouteTable"
    Properties:
      VpcId: !Ref VPC
  PublicRoute:
    Type: "AWS::EC2::Route"
    DependsOn: GatewayToInternet
    Properties:
      RouteTableId: !Ref PublicRouteTable
      DestinationCidrBlock: 0.0.0.0/0
      GatewayId: !Ref InternetGateway
  PublicSubnetRouteTableAssociation:
    Type: "AWS::EC2::SubnetRouteTableAssociation"
    Properties:
      SubnetId: !Ref PublicSubnet
      RouteTableId: !Ref PublicRouteTable
  PublicSubnetRouteTableAssociation2:
    Type: "AWS::EC2::SubnetRouteTableAssociation"
    Condition: DoAz2
    Properties:
      SubnetId: !Ref PublicSubnet2
      RouteTableId: !Ref PublicRouteTable
  PublicSubnetRouteTableAssociation3:
    Condition: DoAz3
    Type: "AWS::EC2::SubnetRouteTableAssociation"
    Properties:
      SubnetId: !Ref PublicSubnet3
      RouteTableId: !Ref PublicRouteTable
  PrivateSubnet:
    Type: "AWS::EC2::Subnet"
    Properties:
      VpcId: !Ref VPC
      CidrBlock: !Select [3, !Cidr [!Ref VpcCidr, 6, !Ref SubnetBits]]
      AvailabilityZone: !Select
      - 0
      - Fn::GetAZs: !Ref "AWS::Region"
  PrivateRouteTable:
    Type: "AWS::EC2::RouteTable"
    Properties:
      VpcId: !Ref VPC
  PrivateSubnetRouteTableAssociation:
    Type: "AWS::EC2::SubnetRouteTableAssociation"
    Properties:
      SubnetId: !Ref PrivateSubnet
      RouteTableId: !Ref PrivateRouteTable
  PrivateSubnet2:
    Type: "AWS::EC2::Subnet"
    Condition: DoAz2
    Properties:
      VpcId: !Ref VPC
      CidrBlock: !Select [4, !Cidr [!Ref VpcCidr, 6, !Ref SubnetBits]]
      AvailabilityZone: !Select
      - 1
      - Fn::GetAZs: !Ref "AWS::Region"
  PrivateRouteTable2:
    Type: "AWS::EC2::RouteTable"
    Condition: DoAz2
    Properties:
      VpcId: !Ref VPC
  PrivateSubnetRouteTableAssociation2:
    Type: "AWS::EC2::SubnetRouteTableAssociation"
    Condition: DoAz2
    Properties:
      SubnetId: !Ref PrivateSubnet2
      RouteTableId: !Ref PrivateRouteTable2
  PrivateSubnet3:
    Type: "AWS::EC2::Subnet"
    Condition: DoAz3
    Properties:
      VpcId: !Ref VPC
      CidrBlock: !Select [5, !Cidr [!Ref VpcCidr, 6, !Ref SubnetBits]]
      AvailabilityZone: !Select
      - 2
      - Fn::GetAZs: !Ref "AWS::Region"
  PrivateRouteTable3:
    Type: "AWS::EC2::RouteTable"
    Condition: DoAz3
    Properties:
      VpcId: !Ref VPC
  PrivateSubnetRouteTableAssociation3:
    Type: "AWS::EC2::SubnetRouteTableAssociation"
    Condition: DoAz3
    Properties:
      SubnetId: !Ref PrivateSubnet3
      RouteTableId: !Ref PrivateRouteTable3
  HTTPSSecurityGroup:
    Type: AWS::EC2::SecurityGroup
    Properties:
      GroupDescription: HTTPS Security Group
      SecurityGroupIngress:
      - IpProtocol: tcp
        FromPort: 443
        ToPort: 443
        CidrIp: !Ref VpcCidr
      VpcId: !Ref VPC
  EC2Endpoint:
    Type: AWS::EC2::VPCEndpoint
    Properties:
      PolicyDocument:
        Version: 2012-10-17
        Statement:
        - Effect: Allow
          Principal: '*'
          Action:
          - '*'
          Resource:
          - '*'
      PrivateDnsEnabled: "true"
      SecurityGroupIds:
      - !Ref HTTPSSecurityGroup
      ServiceName: !Join
      - ''
      - - com.amazonaws.
        - !Ref 'AWS::Region'
        - .ec2
      SubnetIds:
      - !Ref PublicSubnet
      - !If [DoAz2, !Ref PublicSubnet2, !Ref "AWS::NoValue"]
      - !If [DoAz3, !Ref PublicSubnet3, !Ref "AWS::NoValue"]
      VpcEndpointType: Interface
      VpcId: !Ref VPC
  ELBEndpoint:
    Type: AWS::EC2::VPCEndpoint
    Properties:
      PolicyDocument:
        Version: 2012-10-17
        Statement:
        - Effect: Allow
          Principal: '*'
          Action:
          - '*'
          Resource:
          - '*'
      PrivateDnsEnabled: "true"
      SecurityGroupIds:
      - !Ref HTTPSSecurityGroup
      ServiceName: !Join
      - ''
      - - com.amazonaws.
        - !Ref 'AWS::Region'
        - .elasticloadbalancing
      SubnetIds:
      - !Ref PublicSubnet
      - !If [DoAz2, !Ref PublicSubnet2, !Ref "AWS::NoValue"]
      - !If [DoAz3, !Ref PublicSubnet3, !Ref "AWS::NoValue"]
      VpcEndpointType: Interface
      VpcId: !Ref VPC
  S3Endpoint:
    Type: AWS::EC2::VPCEndpoint
    Properties:
      PolicyDocument:
        Version: 2012-10-17
        Statement:
        - Effect: Allow
          Principal: '*'
          Action:
          - '*'
          Resource:
          - '*'
      RouteTableIds:
      - !Ref PublicRouteTable
      - !Ref PrivateRouteTable
      - !If [DoAz2, !Ref PrivateRouteTable2, !Ref "AWS::NoValue"]
      - !If [DoAz3, !Ref PrivateRouteTable3, !Ref "AWS::NoValue"]
      ServiceName: !Join
      - ''
      - - com.amazonaws.
        - !Ref 'AWS::Region'
        - .s3
      VpcId: !Ref VPC

Outputs:
  VpcId:
    Description: ID of the new VPC.
    Value: !Ref VPC
  PublicSubnetIds:
    Description: Subnet IDs of the public subnets.
    Value:
      !Join [
        ",",
        [!Ref PublicSubnet, !If [DoAz2, !Ref PublicSubnet2, !Ref "AWS::NoValue"], !If [DoAz3, !Ref PublicSubnet3, !Ref "AWS::NoValue"]]
      ]
  PrivateSubnetIds:
    Description: Subnet IDs of the private subnets.
    Value:
      !Join [
        ",",
        [!Ref PrivateSubnet, !If [DoAz2, !Ref PrivateSubnet2, !Ref "AWS::NoValue"], !If [DoAz3, !Ref PrivateSubnet3, !Ref "AWS::NoValue"]]
      ]
EOF

# The above cloudformation template's max zones account is 3
if [[ "${ZONES_COUNT}" -gt 3 ]]
then
  ZONES_COUNT=3
fi

STACK_NAME="${CLUSTER_NAME}-shared-vpc-blackhole"
aws --region "${REGION}" cloudformation create-stack \
  --stack-name "${STACK_NAME}" \
  --template-body "$(cat /tmp/blackhole_vpc.yaml)" \
  --tags "${TAGS}" \
  --parameters "ParameterKey=AvailabilityZoneCount,ParameterValue=${ZONES_COUNT}" &

wait "$!"
echo "Created stack"

aws --region "${REGION}" cloudformation wait stack-create-complete --stack-name "${STACK_NAME}" &
wait "$!"
echo "Waited for stack"

subnets="$(aws --region "${REGION}" cloudformation describe-stacks --stack-name "${STACK_NAME}" | jq -c '[.Stacks[].Outputs[] | select(.OutputKey | endswith("SubnetIds")).OutputValue | split(",")[]]' | sed "s/\"/'/g")"
echo "Subnets : ${subnets}"

# save stack information to ${SHARED_DIR} for deprovision step
echo "${STACK_NAME}" >> "${SHARED_DIR}/blackholenetworkstackname"

# Generate working availability zones from the region
mapfile -t AVAILABILITY_ZONES < <(aws --region "${REGION}" ec2 describe-availability-zones | jq -r '.AvailabilityZones[] | select(.State == "available") | .ZoneName' | sort -u)
ZONES=("${AVAILABILITY_ZONES[@]:0:${ZONES_COUNT}}")
ZONES_STR="[ $(join_by , "${ZONES[@]}") ]"
echo "AWS region: ${REGION} (zones: ${ZONES_STR})"

cat > "${PATCH}" << EOF
controlPlane:
  platform:
    aws:
      zones: ${ZONES_STR}
compute:
- platform:
    aws:
      zones: ${ZONES_STR}
platform:
  aws:
    subnets: ${subnets}
EOF

/tmp/yq m -x -i "${CONFIG}" "${PATCH}"

Properties

Property Value Description
Resource requests (cpu) 10m Used in .resources.requests of the pod running this step.
Resource requests (memory) 100Mi Used in .resources.requests of the pod running this step.

GitHub Link:

https://github.com/openshift/release/blob/master/ci-operator/step-registry/ipi/conf/aws/blackholenetwork/ipi-conf-aws-blackholenetwork-ref.yaml

Owners:

Approvers:

Source code for this page located on GitHub