How to upgrade the Thanos Package chart📜

Navigate to the upstream chart repo and folder and find the tag/hash that corresponds with the new chart version for this update
- To find this hash, search the bitnami commits until you find the chart version bump commit to master. This is the hash you will want to use in your KPT pkg update.
- Check the upstream release notes for upgrade notices.
Checkout the renovate/ironbank branch
kpt
- From the root of the repo run kpt pkg update chart@<tag / hash> --strategy alpha-git-patch, where the tag/hash is found in step 1
  - kpt can be run to pull the updates with a targeted tag
  - Run a KPT package update
```
kpt pkg update chart@<tag / hash> --strategy alpha-git-patch
```
  - Reconcile the modifications by following the Modifications Made to the upstream chart section of this document for a list of changes per file to be aware of, for how Big Bang differs from upstream.
    - From the root of the repo once again, run kpt pkg update chart/templates@<hash> --strategy alpha-git-patch.
Modify the version in Chart.yaml and append -bb.0 to the chart version from upstream. See Update main chart section of this document.
Update dependencies and binaries using helm dependency update ./chart
- Pull assets and commit the binaries as well as the Chart.lock file that was generated.
```
helm dependency update ./chart
```
Update CHANGELOG.md adding an entry for the new version and noting all changes in a list (at minimum should include - Updated <chart or dependency> to x.x.x).
Generate the README.md updates by following the guide in gluon.
Push up your changes, add upgrade notices if applicable, validate that CI passes.
- If there are any failures, follow the information in the pipeline to make the necessary updates.
- Add the debug label to the MR for more detailed information.
- Reach out to the CODEOWNERS if needed.
Follow the Testing a new Thanos version section of this document for manual testing.
As part of your MR that modifies bigbang packages, you should modify the bigbang bigbang/tests/test-values.yaml against your branch for the CI/CD MR testing by enabling your packages.
- To do this, at a minimum, you will need to follow the instructions at bigbang/docs/developer/test-package-against-bb.md with changes for Thanos enabled (the below is a reference, actual changes could be more depending on what changes were made to Thanos in the package MR).

test-values.yaml 📜

thanos:
  enabled: true
  git:
    tag: null
    branch: renovate/ironbank
  values:
    istio:
      hardened:
        enabled: true
  ### Additional components of Thanos should be changed to reflect testing changes introduced in the package MR

Modifications Made to the upstream chart📜

/chart/Chart.yaml📜

Modified Version to include -bb.x suffix
Modified to use registry1 minio package dependency

/chart/bigbang/*📜

Network Policies and other common BigBang charts added

chart/values.yaml📜

Add common values for Big Bang packages for domain, networkpolicies, upgradejob, tests, and Istio
Update image registry/repository/tag as required by update
Add image pull secret for private-registry
Set resource requests/limits
Disable Pod Disruption Budgets

Check for Big Bang specifics included in Thanos chart/values.yaml📜

Please check and update the following line references if any upstream modify the line numbers

Line 58-59 ensure sso.enabled to false

sso:
  enabled: false

Line 71-73 ensure registry/repository points to ironbank

  registry: registry1.dso.mil
  repository: ironbank/opensource/thanos/thanos 
  tag: vx.xx.x

Line 85-86 set pullSecrets to private-registry

  pullSecrets:  
    - private-registry

Line 277-283 Ensure query.resources has been set

  resources:
      limits:
        cpu: 300m
        memory: 5Gi
      requests:
        cpu: 300m
        memory: 5Gi

Line 694-701 Comment out existingServiceAccount: “” and add DEPRECATED comment about query.serviceAccount.existingServiceAccount while leaving the rest of serviceAccount as is, uncommented

  ## DEPRECATED query.serviceAccount.existingServiceAccount - This value has been deprecated and will be removed in a future release, please use `serviceAccount.name` in combination with `serviceAccount.create=false` instead
  ##
  serviceAccount:
    create: true
    name: ""
    annotations: {}
    automountServiceAccountToken: false
    ## existingServiceAccount: ""

Line 1053-1059 set the queryFrontend.resources

  resources:
      limits:
        cpu: 100m
        memory: 100Mi
      requests:
        cpu: 100m
        memory: 100Mi

Line 1339-1345 Comment out existingServiceAccount: “” and add DEPRECATED comment about queryFrontend.serviceAccount.existingServiceAccount while leaving the rest of serviceAccount as is, uncommented

Comment out existingServiceAccount: "" and add DEPRECATED comment about queryFrontend.serviceAccount.existingServiceAccount while leaving the rest of serviceAccount as is, uncommented
  ##
  serviceAccount:
    create: true
    name: ""
    annotations: {}
    automountServiceAccountToken: false
    ## existingServiceAccount: ""

Line 1585-1594 set the bucketweb.resources like below

  ## @param bucketweb.resources.limits The resources limits for the Thanos Bucket Web container
  ## @param bucketweb.resources.requests The requested resources for the Thanos Bucket Web container
  ##
  resources:
      limits:
        cpu: 100m
        memory: 100Mi
      requests:
        cpu: 100m
        memory: 100Mi

Line 1872-1878 Comment out existingServiceAccount: “” and add DEPRECATED comment about bucketweb.serviceAccount.existingServiceAccount while leaving the rest of serviceAccount as is, uncommented

Comment out existingServiceAccount: "" and add DEPRECATED comment about bucketweb.serviceAccount.existingServiceAccount while leaving the rest of serviceAccount as is, uncommented
  ##
  serviceAccount:
    create: true
    name: ""
    annotations: {}
    automountServiceAccountToken: false
    ## existingServiceAccount: ""

Line 2133-2142 set the compactor.resources like below

  ## @param compactor.resources.limits The resources limits for the Thanos Compactor container
  ## @param compactor.resources.requests The requested resources for the Thanos Compactor container
  ##
  resources:
      limits:
        cpu: 100m
        memory: 100Mi
      requests:
        cpu: 100m
        memory: 100Mi

Line 2422-2428 Comment out existingServiceAccount: “” and add DEPRECATED comment about compactor.serviceAccount.existingServiceAccount while leaving the rest of serviceAccount as is, uncommented

Comment out existingServiceAccount: "" and add DEPRECATED comment about compactor.serviceAccount.existingServiceAccount while leaving the rest of serviceAccount as is, uncommented
  ##
  serviceAccount:
    create: true
    name: ""
    annotations: {}
    automountServiceAccountToken: false
    ## existingServiceAccount: ""

Line 2698-2707 set the storegateway.resources like below

  ## @param storegateway.resources.limits The resources limits for the Thanos Store Gateway container
  ## @param storegateway.resources.requests The requested resources for the Thanos Store Gateway container
  ##
  resources:
      limits:
        cpu: 100m
        memory: 100Mi
      requests:
        cpu: 100m
        memory: 100Mi

Line 3043-3049 Comment out existingServiceAccount: “” and add DEPRECATED comment about storegateway.serviceAccount.existingServiceAccount while leaving the rest of serviceAccount as is, uncommented

Comment out existingServiceAccount: "" and add DEPRECATED comment about storegateway.serviceAccount.existingServiceAccount while leaving the rest of serviceAccount as is, uncommented
  ##
  serviceAccount:
    create: true
    name: ""
    annotations: {}
    automountServiceAccountToken: false
    ## existingServiceAccount: ""

Line 3455-3464 set the storegateway.resources like below

  ## @param ruler.resources.limits The resources limits for the Thanos Ruler container
  ## @param ruler.resources.requests The requested resources for the Thanos Ruler container
  ##
  resources:
      limits:
        cpu: 100m
        memory: 100Mi
      requests:
        cpu: 100m
        memory: 100Mi

Line 3797-3803 Comment out existingServiceAccount: “” and add DEPRECATED comment about ruler.serviceAccount.existingServiceAccount while leaving the rest of serviceAccount as is, uncommented

## DEPRECATED ruler.serviceAccount.existingServiceAccount - This value has been deprecated and will be removed in a future release, please use `serviceAccount.name` in combination with `serviceAccount.create=false` instead
  ##
  serviceAccount:
    create: true
    name: ""
    annotations: {}
    automountServiceAccountToken: false
    ## existingServiceAccount: ""

Line 4073-4082 set the receive.resources like below

  ## @param receive.resources.limits The resources limits for the Thanos Receive container
  ## @param receive.resources.requests The requested resources for the Thanos Receive container
  ##
  resources:
      limits:
        cpu: 100m
        memory: 100Mi
      requests:
        cpu: 100m
        memory: 100Mi

Line 4385-4392 Comment out existingServiceAccount: “” and add DEPRECATED comment about receive.serviceAccount.existingServiceAccount while leaving the rest of serviceAccount as is, uncommented

  ## DEPRECATED receive.serviceAccount.existingServiceAccount - This value has been deprecated and will be removed in a future release, please use `serviceAccount.name` in combination with `serviceAccount.create=false` instead
  ##
  serviceAccount:
    create: true
    name: ""
    annotations: {}
    automountServiceAccountToken: false
    ## existingServiceAccount: ""

Line 4646-4655 set the receiveDistributor.resources like below

  ## @param receiveDistributor.resources.limits The resources limits for the Thanos Receive container
  ## @param receiveDistributor.resources.requests The requested resources for the Thanos Receive container
  ##
  resources:
      limits:
        cpu: 100m
        memory: 100Mi
      requests:
        cpu: 100m
        memory: 100Mi

Line 4835-4842 Comment out existingServiceAccount: “” and add DEPRECATED comment about storegateway.serviceAccount.existingServiceAccount while leaving the rest of serviceAccount as is, uncommented

  ## DEPRECATED receive.serviceAccount.existingServiceAccount - This value has been deprecated and will be removed in a future release, please use `serviceAccount.name` in combination with `serviceAccount.create=false` instead
  ##
  serviceAccount:
    create: true
    name: ""
    annotations: {}
    automountServiceAccountToken: false
    ## existingServiceAccount: ""

Line 5032-5034 update image to point to registry/repository ironbank/big-bang/base

    registry: registry1.dso.mil
    repository: ironbank/big-bang/base
    tag: 2.1.0

Line 5053-5098 ensure the minio is set as follows below

  ## to be used as an objstore for Thanos, must have minio-operator installed
  enabled: false
  # -- Minio root credentials
  secrets:
    name: "thanos-objstore-creds"
    accessKey: "minio"
    secretKey: "minio123" # default key, change this!
  tenant:
    # -- Buckets to be provisioned to for tenant
    buckets:
      - name: thanos
    # -- Users to to be provisioned to for tenant
    users:
      - name: minio-user
    # -- User credentials to create for above user. Otherwise password is randomly generated.
    # This auth is not required to be set or reclaimed for minio use with Loki
    defaultUserCredentials:
      username: "minio-user"
      password: ""
    ## Specification for MinIO Pool(s) in this Tenant.
    pools:
      - servers: 1
        volumesPerServer: 4
        size: 750Mi
        securityContext:
          runAsUser: 1001
          runAsGroup: 1001
          fsGroup: 1001
          runAsNonRoot: true
        containerSecurityContext:
          runAsUser: 1001
          runAsGroup: 1001
          runAsNonRoot: true
          capabilities:
            drop:
              - ALL
    metrics:
      enabled: false
      port: 9000
      memory: 128M

## @section NetWorkPolicy parameters

networkPolicy:
  ## @param networkPolicy.enabled Enable creation of NetworkPolicy resources. Only Ingress traffic is filtered for now.

Line 5101-5215

  ## @param networkPolicy.allowExternal Don't require client label for connections
  ## The Policy model to apply. When set to false, only pods with the correct
  ## client label will have network access to http and grpc thanos port.
  ## When true, thanos will accept connections from any source
  ## (with the correct destination port).
  ##
  allowExternal: true
  ## @param networkPolicy.explicitNamespacesSelector A Kubernetes LabelSelector to explicitly select namespaces from which traffic could be allowed
  ## If explicitNamespacesSelector is missing or set to {}, only client Pods that are in the networkPolicy's namespace
  ## and that match other criteria, the ones that have the good label, can reach thanos.
  ## But sometimes, we want thanos to be accessible to clients from other namespaces, in this case, we can use this
  ## LabelSelector to select these namespaces, note that the networkPolicy's namespace should also be explicitly added.
  ##
  ## Example:
  ## explicitNamespacesSelector:
  ##   matchLabels:
  ##     role: frontend
  ##   matchExpressions:
  ##    - {key: role, operator: In, values: [frontend]}
  ##
  explicitNamespacesSelector: {}

# -- Domain to service Thanos virtualService
domain: bigbang.dev

istio:
  enabled: false
  hardened:
    enabled: false
    outboundTrafficPolicyMode: "REGISTRY_ONLY"
    customServiceEntries: []
    #   - name: "allow-google"
    #     enabled: true
    #     spec:
    #       hosts:
    #         - google.com
    #       location: MESH_EXTERNAL
    #       ports:
    #         - number: 443
    #           protocol: TLS
    #           name: https
    #       resolution: DNS  
    customAuthorizationPolicies: []
    # - name: "allow-nothing"
    #   enabled: true
    #   spec: {}
    minioOperator:
      enabled: true
      namespaces:
        - minio-operator
      principals:
        - cluster.local/ns/minio-operator/sa/minio-operator
    prometheus:
      enabled: true
      namespaces:
        - monitoring
      principals:
        - cluster.local/ns/monitoring/sa/monitoring-grafana
  mtls:
    # STRICT = Allow only mutual TLS traffic
    # PERMISSIVE = Allow both plain text and mutual TLS traffic
    mode: STRICT
  thanos:
    enabled: true
    labels: {}
    annotations: {}
    gateways:
      - istio-system/main
    hosts:
      - thanos.{{ .Values.domain }}

networkPolicies:
  enabled: false
  ingressLabels:
    app: istio-ingressgateway
    istio: ingressgateway  
  additionalPolicies: []
  # expected use case is to open egress for runner jobs
  # This is a dev example policy spec and CIDR 0.0.0.0/0 is unsafe for operational environments
  # requests to controlPlane should also be blocked in an operational policy
  # - name: egress-runner-jobs
  #   spec:
  #     podSelector: {}
  #     policyTypes:
  #     - Egress
  #     egress:
  #     - to:
  #       - ipBlock:
  #           cidr: 0.0.0.0/0
  #           except:
  #           # Block requests to AWS cloud metadata IP
  #           - 169.254.169.254/32
  #           # Block requests to controlPlane if CIDR not 0.0.0.0/0
  #           # - "{{ $.Values.networkPolicies.controlPlaneCidr }}"

upgradeJob:
  name: thanos-upgrade-job
  image:
    repository: registry1.dso.mil/ironbank/opensource/kubernetes/kubectl
    tag: v1.29.8
    imagePullPolicy: IfNotPresent
    pullSecrets: private-registry
  checkVersion: 15.7.27-bb.1
  serviceAccount: upgrade-job-svc-account
  role: upgrade-role
  roleBinding: upgrade-rolebinding

bbtests:
  enabled: false
  cypress:
    artifacts: true
    envs:
      cypress_thanos_url: 'http://thanos-query:9090'
      cypress_minio_url: 'http://thanos-minio-console:9090'
      prometheus_integration_enabled: "false"
      objstorage_integration_enabled: "false"

chart/Kptfile📜

Tracks current upstream chart

automountServiceAccountToken📜

The mutating Kyverno policy named update-automountserviceaccounttokens is leveraged to harden all ServiceAccounts in this package with automountServiceAccountToken: false. This policy is configured by namespace in the Big Bang umbrella chart repository at chart/templates/kyverno-policies/values.yaml.

This policy revokes access to the K8s API for Pods utilizing said ServiceAccounts. If a Pod truly requires access to the K8s API (for app functionality), the Pod is added to the pods: array of the same mutating policy. This grants the Pod access to the API, and creates a Kyverno PolicyException to prevent an alert.

Testing a new Thanos version📜

NOTE: For these testing steps it is good to do them on both a clean install and an upgrade. For clean install, point Thanos to your branch. For an upgrade do an install with Thanos pointing to the latest tag, then perform a helm upgrade with Thanos pointing to your branch.

Because Thanos aggregates data, it makes sense to integrate Thanos with Prometheus, MiniIO, and Grafana. The cypress tests will verify datasources are enabled for the monitoring.prometheus-sidecar and an s3 objectstore datasource is registered. See the values.yaml and bigbang test-values.yaml for configuration settings.

You will want to install with:

Thanos, Monitoring, Grafana and Istio packages and passing in test-values.yaml

overrides/thanos.yaml

flux:
  interval: 1m
  rollback:
    cleanupOnFail: false

clusterAuditor:
  enabled: false

grafana:
  enabled: true

istioOperator:
  enabled: true

istio:
  enabled: true
  values:
    hardened:
      enabled: true


monitoring:
  enabled: true
  values:
    prometheus:
      prometheusSpec:
        replicas: 3
    istio:
      enabled: true
      hardened:
        enabled: true

addons:
  thanos:
    enabled: true
    git:
      tag: null
      branch: "renovate/ironbank"
    values:
      istio:
        enabled: true
        hardened:
          enabled: true
      minio:
        enabled: true
      storegateway:
        enabled: true
      objstoreConfig: |-
        type: s3
        config:
          bucket: "thanos"
          endpoint: minio.thanos.svc.cluster.local:80
          access_key: "minio"
          secret_key: "minio123"
          insecure: true
          trace:
            enable: true
  minioOperator:
    enabled: true

kyverno:
  enabled: true

kyvernoPolicies:
  enabled: true
  values:
    exclude:
      any:
      # Allows k3d load balancer to bypass policies.
      - resources:
          namespaces:
          - istio-system
          names:
          - svclb-*
    policies:
      restrict-host-path-mount-pv:
        parameters:
          allow:
          - /var/lib/rancher/k3s/storage/pvc-*

Go to https://thanos.dev.bigbang.mil
Select “Endpoints” and verify you see the Sidecar and Store stores. These should both be UP.
Verify that https://thanos.dev.bigbang.mil/status shows the correct thanos version.
Go to https://grafana.dev.bigbang.mil/d/alertmanager-overview/alertmanager-overview and login with default credentials or SSO
Verify the Thanos grafana datasource by changing the dashboard’s datasource to Thanos, data should be displaying properly.

When in doubt with any testing or upgrade steps, reach out to the CODEOWNERS for assistance.