. Retrieve the Aurora VPC
+
.Command:
[source,bash]
----
aws ec2 describe-vpcs \
  --filters "Name=tag:AuroraCluster,Values=keycloak-aurora" \
  --query 'Vpcs[*].VpcId' \
  --region eu-west-1 \
  --output text
----
+
.Output:
[source]
----
vpc-0b40bd7c59dbe4277
----
+
. Retrieve the ROSA cluster VPC
.. Login to the ROSA cluster using `oc`
.. Retrieve the ROSA VPC
+
.Command:
[source,bash]
----
<#noparse>
NODE=$(kubectl get nodes --selector=node-role.kubernetes.io/worker -o jsonpath='{.items[0].metadata.name}')
aws ec2 describe-instances \
  --filters "Name=private-dns-name,Values=${NODE}" \
  --query 'Reservations[0].Instances[0].VpcId' \
  --region eu-west-1 \
  --output text
</#noparse>
----
+
.Output:
[source]
----
vpc-0b721449398429559
----
+
. Create Peering Connection
+
.Command:
[source,bash]
----
aws ec2 create-vpc-peering-connection \
  --vpc-id vpc-0b721449398429559 \# <1>
  --peer-vpc-id vpc-0b40bd7c59dbe4277 \# <2>
  --peer-region eu-west-1 \
  --region eu-west-1
----
<1> ROSA cluster VPC
<2> Aurora VPC
+
.Output:
[source,json]
----
{
    "VpcPeeringConnection": {
        "AccepterVpcInfo": {
            "OwnerId": "606671647913",
            "VpcId": "vpc-0b40bd7c59dbe4277",
            "Region": "eu-west-1"
        },
        "ExpirationTime": "2023-11-08T13:26:30+00:00",
        "RequesterVpcInfo": {
            "CidrBlock": "10.0.17.0/24",
            "CidrBlockSet": [
                {
                    "CidrBlock": "10.0.17.0/24"
                }
            ],
            "OwnerId": "606671647913",
            "PeeringOptions": {
                "AllowDnsResolutionFromRemoteVpc": false,
                "AllowEgressFromLocalClassicLinkToRemoteVpc": false,
                "AllowEgressFromLocalVpcToRemoteClassicLink": false
            },
            "VpcId": "vpc-0b721449398429559",
            "Region": "eu-west-1"
        },
        "Status": {
            "Code": "initiating-request",
            "Message": "Initiating Request to 606671647913"
        },
        "Tags": [],
        "VpcPeeringConnectionId": "pcx-0cb23d66dea3dca9f"
    }
}
----
+
. Wait for Peering connection to exist
+
.Command:
[source,bash]
----
aws ec2 wait vpc-peering-connection-exists --vpc-peering-connection-ids pcx-0cb23d66dea3dca9f
----
+
. Accept the peering connection
+
.Command:
[source,bash]
----
aws ec2 accept-vpc-peering-connection \
  --vpc-peering-connection-id pcx-0cb23d66dea3dca9f \
  --region eu-west-1
----
+
.Output:
[source,json]
----
{
    "VpcPeeringConnection": {
        "AccepterVpcInfo": {
            "CidrBlock": "192.168.0.0/16",
            "CidrBlockSet": [
                {
                    "CidrBlock": "192.168.0.0/16"
                }
            ],
            "OwnerId": "606671647913",
            "PeeringOptions": {
                "AllowDnsResolutionFromRemoteVpc": false,
                "AllowEgressFromLocalClassicLinkToRemoteVpc": false,
                "AllowEgressFromLocalVpcToRemoteClassicLink": false
            },
            "VpcId": "vpc-0b40bd7c59dbe4277",
            "Region": "eu-west-1"
        },
        "RequesterVpcInfo": {
            "CidrBlock": "10.0.17.0/24",
            "CidrBlockSet": [
                {
                    "CidrBlock": "10.0.17.0/24"
                }
            ],
            "OwnerId": "606671647913",
            "PeeringOptions": {
                "AllowDnsResolutionFromRemoteVpc": false,
                "AllowEgressFromLocalClassicLinkToRemoteVpc": false,
                "AllowEgressFromLocalVpcToRemoteClassicLink": false
            },
            "VpcId": "vpc-0b721449398429559",
            "Region": "eu-west-1"
        },
        "Status": {
            "Code": "provisioning",
            "Message": "Provisioning"
        },
        "Tags": [],
        "VpcPeeringConnectionId": "pcx-0cb23d66dea3dca9f"
    }
}
----
+
. Update ROSA cluster VPC route-table
+
.Command:
[source,bash]
----
ROSA_PUBLIC_ROUTE_TABLE_ID=$(aws ec2 describe-route-tables \
  --filters "Name=vpc-id,Values=vpc-0b721449398429559" "Name=association.main,Values=true" \# <1>
  --query "RouteTables[*].RouteTableId" \
  --output text \
  --region eu-west-1
)
aws ec2 create-route \
  --route-table-id ${ROSA_PUBLIC_ROUTE_TABLE_ID} \
  --destination-cidr-block 192.168.0.0/16 \# <2>
  --vpc-peering-connection-id pcx-0cb23d66dea3dca9f \
  --region eu-west-1
----
<1> ROSA cluster VPC
<2> This must be the same as the cidr-block used when creating the Aurora VPC
+
. Update the Aurora Security Group
+
.Command:
[source,bash]
----
AURORA_SECURITY_GROUP_ID=$(aws ec2 describe-security-groups \
  --filters "Name=group-name,Values=keycloak-aurora-security-group" \
  --query "SecurityGroups[*].GroupId" \
  --region eu-west-1 \
  --output text
)
aws ec2 authorize-security-group-ingress \
  --group-id ${AURORA_SECURITY_GROUP_ID} \
  --protocol tcp \
  --port 5432 \
  --cidr 10.0.17.0/24 \# <1>
  --region eu-west-1
----
<1> The "machine_cidr" of the ROSA cluster
+
.Output:
[source,json]
----
{
    "Return": true,
    "SecurityGroupRules": [
        {
            "SecurityGroupRuleId": "sgr-0785d2f04b9cec3f5",
            "GroupId": "sg-0d746cc8ad8d2e63b",
            "GroupOwnerId": "606671647913",
            "IsEgress": false,
            "IpProtocol": "tcp",
            "FromPort": 5432,
            "ToPort": 5432,
            "CidrIpv4": "10.0.17.0/24"
        }
    ]
}
----