Add manual steps to connect EKS clusters

Signed-off-by: suvaanshkumar <[email protected]>

solutions/joining-hub-and-spoke-with-aws-auth-manually/README.md

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+# Manually join Hub and Spoke using AWS-based authentication
+
+This guide provides list of manual steps on how we can manually join AWS EKS clusters as Hub and Spoke using OCM.
+
+
+# Background
+
+We are working on a new feature to run OCM natively on EKS with AWS IAM based authentication. More details, on why and how, can be found in [enhancement proposal](https://github.com/open-cluster-management-io/enhancements/blob/main/enhancements/sig-architecture/105-aws-iam-registration/README.md). This purpose of this document is to:
+- Share with community, 
+- sthe proof of design proposed in [enhancement proposal](https://github.com/open-cluster-management-io/enhancements/blob/main/enhancements/sig-architecture/105-aws-iam-registration/README.md)
+- Get early feedback
+
+
+>  **Note:**
+> 
+> This solution uses [AWS IRSA](https://docs.aws.amazon.com/eks/latest/userguide/iam-roles-for-service-accounts.html) for out going authentication from within an EKS cluster to AWS, and [EKS access entries](https://docs.aws.amazon.com/eks/latest/userguide/access-entries.html) for incoming authentication from outside world to inside the EKS cluster.
+
+While the implementation of this feature is in progress, in the hub and spoke side components. The hub and spoke can be joined using AWS IAM based authentication by running following steps to manipulate hub and spoke components manually:
+
+1. Login to hub and spoke clusters in 2 separate shell sessions with admin access to aws as well as EKS cluster and set following env vars in both.
+    > **Note:** The md5 hash is generated as described [here](https://github.com/open-cluster-management-io/enhancements/blob/main/enhancements/sig-architecture/105-aws-iam-registration/README.md?plain=1#L249). [This](https://www.md5hashgenerator.com/) website can be used to generate md5 hash for these steps.
+   ```bash
+    export HUB_CLUSTER_NAME=<hub-cluster-name>
+    export SPOKE_CLUSTER_NAME=<hub-cluster-name>
+    export HUB_ACCOUNT_ID=<hub-cluster-account-id>
+    export SPOKE_ACCOUNT_ID=<spoke-cluster-account-id>
+    export HUB_ROLE_NAME=ocm-hub-<md5hash>
+    export SPOKE_ROLE_NAME=ocm-managed-cluster-<md5hash>
+    export HUB_POLICY_NAME=<IAM-policy-created-on-hub-IAM-for-spoke>
+    export SPOKE_POLICY_NAME=<IAM-policy-created-on-spoke-IAM-for-spoke>
+    export SPOKE_OIDC_PROVIDER_ID=<spoke-cluster-AWS-oidc-provider>
+    export HUB_REGION=<hub-cluster-region>
+    export SPOKE_REGION=<spoke-cluster-region>
+   ```
+
+   e.g.
+   ```bash
+    export HUB_CLUSTER_NAME=hub
+    export SPOKE_CLUSTER_NAME=spoke
+    export HUB_ACCOUNT_ID=123456789012
+    export SPOKE_ACCOUNT_ID=567890123456
+    export HUB_ROLE_NAME=ocm-hub-138c525cf3b7f74ba3b945e7847792cc
+    export SPOKE_ROLE_NAME=ocm-managed-cluster-138c525cf3b7f74ba3b945e7847792cc
+    export HUB_POLICY_NAME=hub
+    export SPOKE_POLICY_NAME=spoke
+    export SPOKE_OIDC_PROVIDER_ID=BE6D831CFA22823093D17E608EE0048C
+    export HUB_REGION=us-west-2
+    export SPOKE_REGION=us-west-2
+   ```
+
+2. Login to spoke AWS account and create IAM role, policy and tags on spoke IAM. Go to the folder containing this markdown file in this [repository](https://github.com/open-cluster-management-io/open-cluster-management-io.github.io) and run following commands:
+   ```bash
+   sed -e "s/PROVIDER_ID/$SPOKE_OIDC_PROVIDER_ID/g" -e "s/ACCOUNT_ID/$SPOKE_ACCOUNT_ID/g" -e "s/REGION/$SPOKE_REGION/g" templates/Template-Spoke-Role-Trust-Policy.json > templates/Spoke-Role-Trust-Policy.json
+   aws iam create-role --role-name $SPOKE_ROLE_NAME --assume-role-policy-document file://templates/Spoke-Role-Trust-Policy.json
+
+   sed -e "s/ACCOUNT_ID/$HUB_ACCOUNT_ID/g" -e "s/ROLE_NAME/$HUB_ROLE_NAME/g" templates/Template-Spoke-Role-Permission-Policy.json > templates/Spoke-Role-Permission-Policy.json
+   aws iam put-role-policy --role-name $SPOKE_ROLE_NAME --policy-name $SPOKE_POLICY_NAME --policy-document file://templates/Spoke-Role-Permission-Policy.json
+
+   aws iam tag-role --role-name $SPOKE_ROLE_NAME --tags '[{"Key":"hub_cluster_account_id", "Value":"'$HUB_ACCOUNT_ID'"},{"Key":"hub_cluster_name", "Value":"'$HUB_CLUSTER_NAME'"},{"Key":"managed_cluster_account_id", "Value":"'$SPOKE_ACCOUNT_ID'"},{"Key":"managed_cluster_name", "Value":"'$SPOKE_CLUSTER_NAME'"}]'
+   ```
+
+3. Login to hub EKS clusters and initialize hub:
+   ```shell
+   clusteradm init  --wait
+
+   # export hub apiserver url and token from the output of above command
+   # it will be used by spoke
+   export TOKEN=""
+   export HUB_API_SERVER="https://C66946AA519C4818E2189CE5A9324551.wk7.us-west-2.eks.amazonaws.com"
+   ``` 
+
+4. Login to spoke EKS clusters and join with hub, note the new command line options on second line:
+   ```shell
+   clusteradm join --hub-token $TOKEN --hub-apiserver $HUB_API_SERVER --wait --cluster-name $SPOKE_CLUSTER_NAME --singleton \
+   --bundle-version latest --registration-auth awsirsa --hub-cluster-arn arn:aws:eks:$HUB_REGION:"$HUB_ACCOUNT_ID":cluster/$HUB_CLUSTER_NAME
+   ```
+
+5. Making aws-cli available in klusterlet-agent:
+   ```shell
+   # Scaling down klusterlet operator 
+   kubectl -n open-cluster-management patch deployment klusterlet --type='json' -p='[{"op": "replace", "path": "/spec/replicas", "value":0}]'
+
+   # Prepare klusterlet-agent to host aws-cli
+   # Adds initContainer to klusterlet-agent deployment
+   # Add aws-cli to PATH
+
+   kubectl -n open-cluster-management-agent patch deployment klusterlet-agent --type='json' -p='[
+     {
+       "op": "add",
+       "path": "/spec/template/spec/volumes/-",
+       "value": {
+         "name": "awscli",
+         "emptyDir": {}
+       }
+     },
+     {
+       "op": "add",
+       "path": "/spec/template/spec/containers/0/volumeMounts/-",
+       "value": {
+         "name": "awscli",
+         "mountPath": "/awscli"
+       }
+     },
+     {
+       "op": "add",
+       "path": "/spec/template/spec/initContainers",
+       "value": [
+         {
+           "name": "load-awscli",
+           "image": "amazon/aws-cli:latest",
+           "command": ["cp", "-vr", "/usr/local/aws-cli/v2/current/dist", "/awscli"],
+           "volumeMounts": [
+             {
+               "name": "awscli",
+               "mountPath": "/awscli"
+             }
+           ]
+         }
+       ]
+     },
+     {
+       "op": "add",
+       "path": "/spec/template/spec/containers/0/env/-",
+       "value": {
+         "name": "PATH",
+         "value": "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/awscli/dist"
+       }
+     }
+   ]'
+
+   ```
+
+6. Login into hub aws account and create hub role using following script:
+   ```shell
+   sed -e "s/ROLE_NAME/$SPOKE_ROLE_NAME/g" -e "s/SPOKE_ACCOUNT_ID/$SPOKE_ACCOUNT_ID/g" -e "s/HUB_ACCOUNT_ID/$HUB_ACCOUNT_ID/g" -e "s/HUB_CLUSTER_NAME/$HUB_CLUSTER_NAME/g" -e "s/SPOKE_CLUSTER_NAME/$SPOKE_CLUSTER_NAME/g" templates/Template-Hub-Role-Trust-Policy.json > templates/Hub-Role-Trust-Policy.json
+   aws iam create-role --role-name $HUB_ROLE_NAME --assume-role-policy-document file://templates/Hub-Role-Trust-Policy.json
+
+   sed -e "s/REGION/$HUB_REGION/g" -e "s/ACCOUNT_ID/$HUB_ACCOUNT_ID/g" -e "s/CLUSTER_NAME/$HUB_CLUSTER_NAME/g" templates/Template-Hub-Role-Permission-Policy.json > templates/Hub-Role-Permission-Policy.json
+   aws iam put-role-policy --role-name $HUB_ROLE_NAME --policy-name $HUB_POLICY_NAME --policy-document file://templates/Hub-Role-Permission-Policy.json
+   ```
+
+7. Accept the ManagedCluster registration request on hub cluster:
+   ```shell
+   clusteradm accept --cluster $SPOKE_CLUSTER_NAME
+   ```
+   > Note: Ignore the following error as there is no CSR in aws registration flow:
+   > 
+   > Error: no csr is approved yet for cluster `spoke-cluster-name`
+
+8. Create access entry on hub EKS cluster using the below commands:
+   ```shell 
+   aws eks list-access-entries --cluster $HUB_CLUSTER_NAME --region=$HUB_REGION
+   aws eks create-access-entry --cluster-name $HUB_CLUSTER_NAME --region=$HUB_REGION --principal-arn arn:aws:iam::"$HUB_ACCOUNT_ID":role/$HUB_ROLE_NAME --username $SPOKE_CLUSTER_NAME --kubernetes-groups open-cluster-management:$SPOKE_CLUSTER_NAME
+   aws eks list-access-entries --cluster $HUB_CLUSTER_NAME --region=$HUB_REGION | grep -i $HUB_ROLE_NAME
+   ```
+
+9. Generate the secret called `hub-kubeconfig-secret` in `open-cluster-management-agent` namespace using above kubeconfig:
+   ```shell
+   HUB_KUBECONFIG=$(aws eks update-kubeconfig --name $HUB_CLUSTER_NAME --kubeconfig /awscli/kubeconfig.kubeconfig --role-arn arn:aws:iam::"$HUB_ACCOUNT_ID":role/$HUB_ROLE_NAME --dry-run)
+
+   AGENT_NAME_ENCODED=$(kubectl get klusterlet klusterlet -o jsonpath='{.metadata.uid}' | tr -d '\n' | base64 | tr -d '\n')
+   SPOKE_CLUSTER_NAME_ENCODED=$(echo -n "$SPOKE_CLUSTER_NAME" | base64 | tr -d '\n')
+   HUB_KUBECONFIG_ENCODED=$(echo -n "$HUB_KUBECONFIG" | base64 | tr -d '\n')
+   HUB_KUBECONFIG_ENCODED_ESCAPED=$(printf '%s' "$HUB_KUBECONFIG_ENCODED" | sed 's/[&/\|]/\\&/g')
+
+   sed -e "s|\${AGENT_NAME_ENCODED}|$AGENT_NAME_ENCODED|g" \
+       -e "s|\${SPOKE_CLUSTER_NAME_ENCODED}|$SPOKE_CLUSTER_NAME_ENCODED|g" \
+       -e "s|\${HUB_KUBECONFIG_ENCODED}|$HUB_KUBECONFIG_ENCODED_ESCAPED|g" \
+       templates/Template-hub-kubeconfig-secret.yaml > hubKubeconfigSecret.yaml
+
+   # Updating the clusterName to "hub" to make it same as bootstrap-kubeconfig
+   # to pass a validation in ocm. Install yq, if missing, for following command
+   NEW_CLUSTER_NAME="hub"
+   yq eval "
+   (.clusters[].name = \"${NEW_CLUSTER_NAME}\") |
+   (.contexts[].context.cluster = \"${NEW_CLUSTER_NAME}\") |
+   del(.users[].user.exec.env)
+   " -i "hubKubeconfigSecret.yaml"
+
+   kubectl apply -f hubKubeconfigSecret.yaml
+   ```
+
+10. Create a sample manifestwork in hub. Confirm that resources are pushed to spoke.

solutions/joining-hub-and-spoke-with-aws-auth-manually/templates/Template-Hub-Role-Permission-Policy.json

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+{
+  "Version": "2012-10-17",
+  "Statement": [
+    {
+      "Effect": "Allow",
+      "Action": [
+        "eks:DescribeCluster",
+        "eks:ListClusters"
+      ],
+      "Resource": "arn:aws:eks:REGION:ACCOUNT_ID:cluster/CLUSTER_NAME"
+    }
+  ]
+}

solutions/joining-hub-and-spoke-with-aws-auth-manually/templates/Template-Hub-Role-Trust-Policy.json

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+{
+  "Version": "2012-10-17",
+  "Statement": [
+    {
+      "Effect": "Allow",
+      "Principal": {
+        "AWS": "arn:aws:iam::SPOKE_ACCOUNT_ID:role/ROLE_NAME"
+      },
+      "Action": "sts:AssumeRole",
+      "Condition": {
+        "StringEquals": {
+          "aws:PrincipalTag/hub_cluster_account_id":"HUB_ACCOUNT_ID",
+          "aws:PrincipalTag/hub_cluster_name":"HUB_CLUSTER_NAME",
+          "aws:PrincipalTag/managed_cluster_account_id":"SPOKE_ACCOUNT_ID",
+          "aws:PrincipalTag/managed_cluster_name":"SPOKE_CLUSTER_NAME"
+        }
+      }
+    }
+  ]
+}

solutions/joining-hub-and-spoke-with-aws-auth-manually/templates/Template-Spoke-Role-Permission-Policy.json

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+{
+  "Version": "2012-10-17",
+  "Statement": [
+    {
+      "Effect": "Allow",
+      "Action": "sts:AssumeRole",
+      "Resource": "arn:aws:iam::ACCOUNT_ID:role/ROLE_NAME"
+    }
+  ]
+}

solutions/joining-hub-and-spoke-with-aws-auth-manually/templates/Template-Spoke-Role-Trust-Policy.json

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+{
+  "Version": "2012-10-17",
+  "Statement": [
+    {
+      "Effect": "Allow",
+      "Principal": {
+        "Federated": "arn:aws:iam::ACCOUNT_ID:oidc-provider/oidc.eks.REGION.amazonaws.com/id/PROVIDER_ID"
+      },
+      "Action": "sts:AssumeRoleWithWebIdentity",
+      "Condition": {
+        "StringEquals": {
+          "oidc.eks.REGION.amazonaws.com/id/PROVIDER_ID:sub": "system:serviceaccount:open-cluster-management-agent:klusterlet-registration-sa",
+          "oidc.eks.REGION.amazonaws.com/id/PROVIDER_ID:aud": "sts.amazonaws.com"
+        }
+      }
+    },
+    {
+      "Effect": "Allow",
+      "Principal": {
+        "Federated": "arn:aws:iam::ACCOUNT_ID:oidc-provider/oidc.eks.REGION.amazonaws.com/id/PROVIDER_ID"
+      },
+      "Action": "sts:AssumeRoleWithWebIdentity",
+      "Condition": {
+        "StringEquals": {
+          "oidc.eks.REGION.amazonaws.com/id/PROVIDER_ID:sub": "system:serviceaccount:open-cluster-management-agent:klusterlet-work-sa",
+          "oidc.eks.REGION.amazonaws.com/id/PROVIDER_ID:aud": "sts.amazonaws.com"
+        }
+      }
+    }
+  ]
+}

solutions/joining-hub-and-spoke-with-aws-auth-manually/templates/Template-hub-kubeconfig-secret.yaml

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+apiVersion: v1
+data:
+  agent-name: ${AGENT_NAME_ENCODED}
+  cluster-name: ${SPOKE_CLUSTER_NAME_ENCODED}
+  kubeconfig: ${HUB_KUBECONFIG_ENCODED}
+kind: Secret
+metadata:
+  name: hub-kubeconfig-secret
+  namespace: open-cluster-management-agent
+type: Opaque