multicluster.yaml

name: Multicluster

# Any change in triggers needs to be reflected in the concurrency group.
on:
  ### FOR TESTING PURPOSES
  # This workflow runs in the context of `main`, and ignores changes to
  # workflow files in PRs. For testing changes to this workflow from a PR:
  # - Make sure the PR uses a branch from the base repository (requires write
  #   privileges). It will not work with a branch from a fork (missing secrets).
  # - Uncomment the `pull_request` event below, commit separately with a `DO
  #   NOT MERGE` message, and push to the PR. As long as the commit is present,
  #   any push to the PR will trigger this workflow.
  # - Don't forget to remove the `DO NOT MERGE` commit once satisfied. The run
  #   will disappear from the PR checks: please provide a direct link to the
  #   successful workflow run (can be found from Actions tab) in a comment.
  #
  # pull_request: {}
  ###
  pull_request_target: {}
  # Run every 6 hours
  schedule:
    - cron:  '0 3/6 * * *'

# By specifying the access of one of the scopes, all of those that are not
# specified are set to 'none'.
permissions:
  # To be able to access the repository with actions/checkout
  contents: read
  # To be able to request the JWT from GitHub's OIDC provider
  id-token: write

concurrency:
  group: ${{ github.workflow }}-${{ github.event.pull_request.number || 'scheduled' }}
  cancel-in-progress: true

env:
  zone: us-west2-a
  # renovate: datasource=github-releases depName=cilium/cilium
  cilium_version: v1.16.2
  kubectl_version: v1.23.6
  USE_GKE_GCLOUD_AUTH_PLUGIN: True

jobs:
  installation-and-connectivity:
    name: Multicluster Installation and Connectivity Test
    if: ${{ github.repository == 'cilium/cilium-cli' }}
    runs-on: ubuntu-24.04
    timeout-minutes: 45
    strategy:
      fail-fast: false
    steps:
      - name: Checkout
        uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0

      # Note: These names currently approach the limit of 40 characters
      - name: Set mode-specific names
        run: |
          echo "clusterNameBase=${{ github.event.repository.name }}-${{ github.run_id }}-${{ github.run_attempt }}" >> $GITHUB_ENV
          echo "clusterName1=${{ github.event.repository.name }}-${{ github.run_id }}-${{ github.run_attempt }}-1" >> $GITHUB_ENV
          echo "clusterName2=${{ github.event.repository.name }}-${{ github.run_id }}-${{ github.run_attempt }}-2" >> $GITHUB_ENV
          echo "firewallRuleName=${{ github.event.repository.name }}-${{ github.run_id }}-${{ github.run_attempt }}" >> $GITHUB_ENV

      - name: Install kubectl
        run: |
          curl -sLO "https://dl.k8s.io/release/${{ env.kubectl_version }}/bin/linux/amd64/kubectl"
          curl -sLO "https://dl.k8s.io/${{ env.kubectl_version }}/bin/linux/amd64/kubectl.sha256"
          echo "$(cat kubectl.sha256)  kubectl" | sha256sum --check
          sudo install -o root -g root -m 0755 kubectl /usr/local/bin/kubectl
          kubectl version --client

      - name: Set up gcloud credentials
        id: 'auth'
        uses: google-github-actions/auth@8254fb75a33b976a221574d287e93919e6a36f70 # v2.1.6
        with:
          workload_identity_provider: ${{ secrets.GCP_PR_WORKLOAD_IDENTITY_PROVIDER }}
          service_account: ${{ secrets.GCP_PR_SA_CLI }}
          create_credentials_file: true
          export_environment_variables: true

      - name: Set up gcloud CLI
        uses: google-github-actions/setup-gcloud@f0990588f1e5b5af6827153b93673613abdc6ec7 # v2.1.1
        with:
          project_id: ${{ secrets.GCP_PR_PROJECT_ID }}
          version: "405.0.0"

      - name: Install gke-gcloud-auth-plugin
        run: |
          gcloud components install gke-gcloud-auth-plugin

      - name: Display gcloud CLI info
        run: |
          gcloud info

      - name: Set up Go
        uses: actions/setup-go@0a12ed9d6a96ab950c8f026ed9f722fe0da7ef32 # v5.0.2
        with:
          # renovate: datasource=golang-version depName=go
          go-version: 1.23.2

      - name: Set up job variables
        id: vars
        run: |
          if [ ${{ github.event.issue.pull_request || github.event.pull_request }} ]; then
            PR_API_JSON=$(curl \
              -H "Accept: application/vnd.github.v3+json" \
              -H "Authorization: Bearer ${{ secrets.GITHUB_TOKEN }}" \
              ${{ github.event.issue.pull_request.url || github.event.pull_request.url }})
            SHA=$(echo "$PR_API_JSON" | jq -r ".head.sha")
            OWNER=$(echo "$PR_API_JSON" | jq -r ".number")
          else
            SHA=${{ github.sha }}
            OWNER=${{ github.sha }}
          fi

          echo "sha=${SHA}" >> $GITHUB_OUTPUT
          echo "owner=${OWNER}" >> $GITHUB_OUTPUT

      - name: Create GKE cluster 2
        run: |
          gcloud container clusters create ${{ env.clusterName2 }} \
            --labels "usage=${{ github.repository_owner }}-${{ github.event.repository.name }},owner=${{ steps.vars.outputs.owner }}" \
            --zone ${{ env.zone }} \
            --enable-ip-alias \
            --create-subnetwork="range=/26" \
            --cluster-ipv4-cidr="/21" \
            --services-ipv4-cidr="/24" \
            --image-type COS_CONTAINERD \
            --num-nodes 2 \
            --machine-type e2-custom-2-4096 \
            --disk-type pd-standard \
            --disk-size 20GB \
            --node-taints node.cilium.io/agent-not-ready=true:NoExecute \
            --preemptible \
            --async

      - name: Create GKE cluster 1
        run: |
          gcloud container clusters create ${{ env.clusterName1 }} \
            --labels "usage=${{ github.repository_owner }}-${{ github.event.repository.name }},owner=${{ steps.vars.outputs.owner }}" \
            --zone ${{ env.zone }} \
            --enable-ip-alias \
            --create-subnetwork="range=/26" \
            --cluster-ipv4-cidr="/21" \
            --services-ipv4-cidr="/24" \
            --image-type COS_CONTAINERD \
            --num-nodes 2 \
            --machine-type e2-custom-2-4096 \
            --disk-type pd-standard \
            --disk-size 20GB \
            --node-taints node.cilium.io/agent-not-ready=true:NoExecute \
            --preemptible \
            --async

      - name: Wait for clusters to be provisioned
        run: |
          while [ "$(gcloud container operations list --filter="status=RUNNING AND targetLink~${{ env.clusterNameBase }}" --format="value(name)")" ];do
            echo "cluster has an ongoing operation, waiting for all operations to finish"; sleep 10
          done

      - name: Get cluster credentials and save context names
        id: contexts
        run: |
          gcloud container clusters get-credentials ${{ env.clusterName1 }} --zone ${{ env.zone }}
          gcloud container clusters get-credentials ${{ env.clusterName2 }} --zone ${{ env.zone }}
          CLUSTER1=$(kubectl config view | grep "${{ env.clusterName1 }}" | head -1 | awk '{print $2}')
          CLUSTER2=$(kubectl config view | grep "${{ env.clusterName2 }}" | head -1 | awk '{print $2}')
          echo "cluster1=${CLUSTER1}" >> $GITHUB_OUTPUT
          echo "cluster2=${CLUSTER2}" >> $GITHUB_OUTPUT

      - name: Allow cross-cluster traffic
        run: |
          TAG1=$(gcloud compute firewall-rules list --filter="name~^gke-${{ env.clusterName1 }}-[0-9a-z]*-all$" --format="value(name)")
          TAG2=$(gcloud compute firewall-rules list --filter="name~^gke-${{ env.clusterName2 }}-[0-9a-z]*-all$" --format="value(name)")
          gcloud compute firewall-rules describe $TAG1
          gcloud compute firewall-rules describe $TAG2
          gcloud compute firewall-rules create ${{ env.firewallRuleName }} --allow tcp,udp,icmp,sctp,esp,ah --priority=999 --source-ranges=10.0.0.0/9 --target-tags=${TAG1/-all/-node},${TAG2/-all/-node}
          gcloud compute firewall-rules describe ${{ env.firewallRuleName }}

      - name: Install Cilium CLI
        uses: ./
        with:
          skip-build: 'true'
          image-tag: ${{ steps.vars.outputs.sha }}

      - name: Install Cilium and run tests
        timeout-minutes: 60
        run: |
          # Install Cilium in cluster1
          cilium install \
            --version "${{ env.cilium_version }}" \
            --context "${{ steps.contexts.outputs.cluster1 }}" \
            --set loadBalancer.l7.backend=envoy \
            --set tls.secretsBackend=k8s \
            --set cluster.name="${{ env.clusterName1 }}" \
            --set cluster.id=1 \
            --set bpf.monitorAggregation=none \
            --set ipv4NativeRoutingCIDR=10.0.0.0/9 \
            --set hubble.eventQueueSize=65536

          # Copy the CA cert from cluster1 to cluster2
          kubectl --context ${{ steps.contexts.outputs.cluster1 }} get secrets -n kube-system cilium-ca -oyaml \
            | kubectl --context ${{ steps.contexts.outputs.cluster2 }} apply -f -

          # This seeds all CAs in cluster2 due to logic in the helm chart found here, e.g. for Hubble
          # https://github.com/cilium/cilium/blob/8b6aa6eda91927275ae722ac020deeb5a9ce479d/install/kubernetes/cilium/templates/hubble/tls-helm/_helpers.tpl#L24-L33

          # Install Cilium in cluster2
          cilium install \
            --version "${{ env.cilium_version }}" \
            --context "${{ steps.contexts.outputs.cluster2 }}" \
            --set loadBalancer.l7.backend=envoy \
            --set tls.secretsBackend=k8s \
            --set cluster.name="${{ env.clusterName2 }}" \
            --set cluster.id=2 \
            --set bpf.monitorAggregation=none \
            --set ipv4NativeRoutingCIDR=10.0.0.0/9 \
            --set hubble.eventQueueSize=65536

          # Enable Relay
          cilium --context "${{ steps.contexts.outputs.cluster1 }}" hubble enable
          cilium --context "${{ steps.contexts.outputs.cluster2 }}" hubble enable --relay=false

          # Wait for cilium and hubble relay to be ready
          # NB: necessary to work against occassional flakes due to https://github.com/cilium/cilium-cli/issues/918
          cilium --context "${{ steps.contexts.outputs.cluster1 }}" status --wait
          cilium --context "${{ steps.contexts.outputs.cluster2 }}" status --wait

          # Enable cluster mesh
          # Test autodetection of service parameters for GKE
          cilium --context "${{ steps.contexts.outputs.cluster1 }}" clustermesh enable
          cilium --context "${{ steps.contexts.outputs.cluster2 }}" clustermesh enable

          # Wait for cluster mesh status to be ready
          cilium --context "${{ steps.contexts.outputs.cluster1 }}" clustermesh status --wait
          cilium --context "${{ steps.contexts.outputs.cluster2 }}" clustermesh status --wait

          # Print clustermesh Service annotations
          printf "Service annotations for Cluster 1 %s\n" \
          $(kubectl --context "${{ steps.contexts.outputs.cluster1 }}" get svc -n kube-system clustermesh-apiserver -o jsonpath='{.metadata.annotations}')
          printf "Service annotations for Cluster 2 %s\n" \
          $(kubectl --context "${{ steps.contexts.outputs.cluster2 }}" get svc -n kube-system clustermesh-apiserver -o jsonpath='{.metadata.annotations}')

          # Connect clusters
          cilium --context "${{ steps.contexts.outputs.cluster1 }}" clustermesh connect --destination-context "${{ steps.contexts.outputs.cluster2 }}"

          # Wait for cluster mesh status to be ready
          cilium --context "${{ steps.contexts.outputs.cluster1 }}" clustermesh status --wait
          cilium --context "${{ steps.contexts.outputs.cluster2 }}" clustermesh status --wait

          # Port forward Relay
          cilium --context "${{ steps.contexts.outputs.cluster1 }}" hubble port-forward&
          sleep 10s
          [[ $(pgrep -f "kubectl.*port-forward.*hubble-relay" | wc -l) == 1 ]]

          # Run connectivity test
          cilium --context "${{ steps.contexts.outputs.cluster1 }}" connectivity test --test-concurrency=5 \
            --multi-cluster "${{ steps.contexts.outputs.cluster2 }}" --test '!/*-deny,!/pod-to-.*-nodeport' \
            --all-flows --collect-sysdump-on-failure --external-target google.com.

      - name: Post-test information gathering
        if: ${{ !success() }}
        run: |
          echo "=== Retrieve cluster1 state ==="
          kubectl --context "${{ steps.contexts.outputs.cluster1 }}" get pods --all-namespaces -o wide
          cilium --context "${{ steps.contexts.outputs.cluster1 }}" status
          cilium --context "${{ steps.contexts.outputs.cluster1 }}" clustermesh status
          cilium --context "${{ steps.contexts.outputs.cluster1 }}" sysdump --output-filename cilium-sysdump-cluster1

          echo "=== Retrieve cluster2 state ==="
          kubectl --context "${{ steps.contexts.outputs.cluster2 }}" get pods --all-namespaces -o wide
          cilium --context "${{ steps.contexts.outputs.cluster2 }}" status
          cilium --context "${{ steps.contexts.outputs.cluster2 }}" clustermesh status
          cilium --context "${{ steps.contexts.outputs.cluster2 }}" sysdump --output-filename cilium-sysdump-cluster2
        shell: bash {0} # Disable default fail-fast behaviour so that all commands run independently

      - name: Clean up GKE
        if: ${{ always() }}
        run: |
          while [ "$(gcloud container operations list --filter="status=RUNNING AND targetLink~${{ env.clusterNameBase }}" --format="value(name)")" ];do
            echo "cluster has an ongoing operation, waiting for all operations to finish"; sleep 15
          done
          gcloud container clusters delete ${{ env.clusterName1 }} --zone ${{ env.zone }} --quiet --async
          gcloud container clusters delete ${{ env.clusterName2 }} --zone ${{ env.zone }} --quiet --async
          gcloud compute firewall-rules delete ${{ env.firewallRuleName }} --quiet
        shell: bash {0} # Disable default fail-fast behavior so that all commands run independently

      - name: Upload artifacts
        if: ${{ !success() }}
        uses: actions/upload-artifact@50769540e7f4bd5e21e526ee35c689e35e0d6874 # v4.4.0
        with:
          name: cilium-sysdump-out.zip
          path: |
            cilium-sysdump-cluster1.zip
            cilium-sysdump-cluster2.zip
          retention-days: 5