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helm_release: v3.8.2
kubernetes_release: v1.23.8
istio_release: 1.1417.10
Cert-Manager: 1.5.4
Strimzi-Operator: 0.30.0

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Configure the Helm repository:

Code Block
$ helm repo add istio https://istio-release.storage.googleapis.com/charts $ helm repo update

Create a namespace for "mesh-level" configurations
Code Block
$ kubectl create namespace istio-config
Create a namespace istio-system for Istio components:
Code Block
$ kubectl create namespace istio-system
Install the Istio Base chart which contains cluster-wide resources used by the Istio control plane:
Code Block
$ helm upgrade -i istio-base istio/base -n istio-system --version 1.1417.10

Install the Istio Discovery chart which deploys the istiod service:
(enable the variable to enforce the (sidecar) proxy startup before the container start)

Code Block
$ helm upgrade -i istiod istio/istiod -n istio-system --version 1.14.1 --wait --set global.proxy.holdApplicationUntilProxyStarts=true --set meshConfig.rootNamespace=istio-config

Add an EnvoyFilter for HTTP header case

When handling HTTP/1.1, Envoy will normalize the header keys to be all lowercase.
While this is compliant with the HTTP/1.1 spec, in practice this can result in issues when migrating existing systems that might rely on specific header casing.
In our case a problem was detected in the SDC client implementation, thich relies on uppercase header values.
To solve this problem in general

we add a EnvoyFilter to keep the uppercase header in the istio-config namespace to apply for all namespaces.
but set the context to SIDECAR_INBOUND to avoid problems in the connection between Istio-Gateway and Services

Create a EnvoyFilter file (e.g. envoyfilter-case.yaml)

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Create a values-override.yaml file to override settings (required for oauth2-proxy):

Code Block

global:
  proxy:
    # Controls if sidecar is injected at the front of the container list and blocks the start of the other containers until the proxy is ready
    holdApplicationUntilProxyStarts: true
  #logging:
  #  level: "default:debug"
meshConfig:
  rootNamespace: istio-config
  extensionProviders:
  - name: oauth2-proxy
    envoyExtAuthzHttp:
      service: oauth2-proxy.default.svc.cluster.local
      port: 80
      timeout: 1.5s
      includeHeadersInCheck: ["authorization", "cookie"]
      headersToUpstreamOnAllow: ["x-forwarded-access-token", "authorization", "path", "x-auth-request-user", "x-auth-request-email", "x-auth-request-access-token"]
      headersToDownstreamOnDeny: ["content-type", "set-cookie"]
pilot:
  env:
    PILOT_ENABLE_MYSQL_FILTER: true
    PILOT_HTTP10: true

Install Istio Discovery using the override file

Code Block
$ helm upgrade -i istiod istio/istiod -n istio-system --version 1.17.0 --wait -f ./values-override.yaml

Add an EnvoyFilter for HTTP header case

When handling HTTP/1.1, Envoy will normalize the header keys to be all lowercase.
While this is compliant with the HTTP/1.1 spec, in practice this can result in issues when migrating existing systems that might rely on specific header casing.
In our case a problem was detected in the SDC client implementation, thich relies on uppercase header values.
To solve this problem in general

we add a EnvoyFilter to keep the uppercase header in the istio-config namespace to apply for all namespaces.
but set the context to SIDECAR_INBOUND and SIDECAR_OUTBOUND to avoid problems in the connection between Istio-Gateway and Services

Create a EnvoyFilter file (e.g. envoyfilter-case.yaml)

Code Block

---
apiVersion: networking.istio.io/v1alpha3
kind: EnvoyFilter
metadata:
  name: header-casing-inbound
  namespace: istio-config
  #annotations:
  #  argocd.argoproj.io/hook: PostSync
spec:
  configPatches:
  - applyTo: CLUSTER
    match:
      context: SIDECAR_INBOUND
    patch:
      operation: MERGE
      value:
        typed_extension_protocol_options:
          envoy.extensions.upstreams.http.v3.HttpProtocolOptions:
            '@type': type.googleapis.com/envoy.extensions.upstreams.http.v3.HttpProtocolOptions
            use_downstream_protocol_config:
              http_protocol_options:
                header_key_format:
                  stateful_formatter:
                    name: preserve_case
                    typed_config:
                      '@type': type.googleapis.com/envoy.extensions.http.header_formatters.preserve_case.v3.PreserveCaseFormatterConfig
  - applyTo: NETWORK_FILTER
    match:
      listener:
        filterChain:
          filter:
            name: envoy.filters.network.http_connection_manager
    patch:
      operation: MERGE
      value:
        typed_config:
          '@type': type.googleapis.com/envoy.extensions.filters.network.http_connection_manager.v3.HttpConnectionManager
          http_protocol_options:
            header_key_format:
              stateful_formatter:
                name: preserve_case
                typed_config:
                  '@type': type.googleapis.com/envoy.extensions.http.header_formatters.preserve_case.v3.PreserveCaseFormatterConfig
---
apiVersion: networking.istio.io/v1alpha3
kind: EnvoyFilter
metadata:
  name: header-casing-outbound
  namespace: istio-config
  #annotations:
  #  argocd.argoproj.io/hook: PostSync
spec:
  configPatches:
  - applyTo: CLUSTER
    match:
      context: SIDECAR_INBOUNDOUTBOUND
    patch:
      operation: MERGE
      value:
        typed_extension_protocol_options:
          envoy.extensions.upstreams.http.v3.HttpProtocolOptions:
            '@type': type.googleapis.com/envoy.extensions.upstreams.http.v3.HttpProtocolOptions
            use_downstream_protocol_config:
              http_protocol_options:
                header_key_format:
                  stateful_formatter:
                    name: preserve_case
                    typed_config:
                      '@type': type.googleapis.com/envoy.extensions.http.header_formatters.preserve_case.v3.PreserveCaseFormatterConfig
  - applyTo: NETWORK_FILTER
    match:
      listener:
        filterChain:
          filter:
            name: envoy.filters.network.http_connection_manager
    patch:
      operation: MERGE
      value:
        typed_config:
          '@type': type.googleapis.com/envoy.extensions.filters.network.http_connection_manager.v3.HttpConnectionManager
          http_protocol_options:
            header_key_format:
              stateful_formatter:
                name: preserve_case
                typed_config:
                  '@type': type.googleapis.com/envoy.extensions.http.header_formatters.preserve_case.v3.PreserveCaseFormatterConfig

Apply the change to Istio

Code Block
$ kubectl apply -f envoyfilter-case.yaml

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Create a namespace istio-ingress for the Istio Ingress gateway and enable istio-injection:

Code Block
$ kubectl create namespace istio-ingress $ kubectl label namespace istio-ingress istio-injection=enabled

Install the Istio Gateway chart:

Code Block
$ helm upgrade -i istio-ingress istio/gateway -n istio-ingress --version 1.1415.1 --wait

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Add an EnvoyFilter for HTTP header case

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