Kernel https://lwn.net/Articles/542629/ One of the features merged in the 3.9 development cycle was TCP and UDP support for the SO_REUSEPORT socket option; that support was implemented in a series of patches by Tom Herbert. The new socket option allows multiple sockets on the same host to bind to the same port, and is intended to improve the performance of multithreaded network server applications running on top of multicore systems. The basic concept of SO_REUSEPORT is simple enough.

https://www.envoyproxy.io/docs/envoy/latest/intro/arch_overview/upstream/connection_pooling#automatic-protocol-selection Connection pooling For HTTP traffic, Envoy supports abstract connection pools that are layered on top of the underlying wire protocol (HTTP/1.1, HTTP/2, HTTP/3). The utilizing filter code does not need to be aware of whether the underlying protocol supports true multiplexing or not. In practice the underlying implementations have the following high level properties: HTTP/1.1 The HTTP/1.1 connection pool acquires connections as needed to an upstream host (up to the circuit breaking limit).

TLS ALPN Force HTTP 1.1 https://www.tetrate.io/blog/envoy-and-istio-security-releases-june-2020/ Envoy versions can mitigate those vulnerabilities by disabling HTTP2 and allowing only HTTP/1.1 by setting http_connection_manager.codec_type to “HTTP1” and removing “h2” from common_tls_context.alpn_protocols. For Istio: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 apiVersion: networking.istio.io/v1alpha3 kind: EnvoyFilter metadata: name: disable-ingress-h2 namespace: istio-system spec: workloadSelector: labels: istio: ingressgateway configPatches: - applyTo: NETWORK_FILTER # http connection manager is a filter in Envoy match: context: GATEWAY listener: filterChain: filter: name: "envoy.

HTTP Protocol Options https://www.envoyproxy.io/docs/envoy/latest/api-v3/extensions/upstreams/http/v3/http_protocol_options.proto#extensions-upstreams-http-v3-httpprotocoloptions-autohttpconfig This extension may be referenced by the qualified name envoy.upstreams.http.http_protocol_options extensions.upstreams.http.v3.HttpProtocolOptions HttpProtocolOptions specifies Http upstream protocol options. This object is used in typed_extension_protocol_options, keyed by the name envoy.extensions.upstreams.http.v3.HttpProtocolOptions. This controls what protocol(s) should be used for upstream and how said protocol(s) are configured. This replaces the prior pattern of explicit protocol configuration directly in the cluster. So a configuration like this, explicitly configuring the use of HTTP/2 upstream:

https://helm.sh/docs/topics/charts/ Chart A Chart is a Helm package. It contains all of the resource definitions necessary to run an application, tool, or service inside of a Kubernetes cluster. Think of it like the Kubernetes equivalent of a Homebrew formula, an Apt dpkg, or a Yum RPM file. Directory structure wordpress/ Chart.yaml # A YAML file containing information about the chart LICENSE # OPTIONAL: A plain text file containing the license for the chart README.

As you edit your chart, you can validate that it is well-formed by running helm lint. When it’s time to package the chart up for distribution, you can run the helm package command: 1 2 $ helm package deis-workflow deis-workflow-0.1.0.tgz

Helm installs charts into Kubernetes, creating a new release for each installation. And to find new charts, you can search Helm chart repositories. Helm Chart Repository A Repository is the place where charts can be collected and shared. It’s like Perl’s CPAN archive or the Fedora Package Database, but for Kubernetes packages. 1 helm repo add bitnami https://charts.bitnami.com/bitnami $ helm search repo bitnami NAME CHART VERSION APP VERSION DESCRIPTION bitnami/bitnami-common 0.

Helm installs resources in the following order: Namespace NetworkPolicy ResourceQuota LimitRange PodSecurityPolicy PodDisruptionBudget ServiceAccount Secret SecretList ConfigMap StorageClass PersistentVolume PersistentVolumeClaim CustomResourceDefinition ClusterRole ClusterRoleList ClusterRoleBinding ClusterRoleBindingList Role RoleList RoleBinding RoleBindingList Service DaemonSet Pod ReplicationController ReplicaSet Deployment HorizontalPodAutoscaler StatefulSet Job CronJob Ingress APIService

https://helm.sh/docs/howto/charts_tips_and_tricks/ Helm uses Go templates for templating your resource files. While Go ships several built-in functions, we have added many others. First, we added all of the functions in the Sprig library, except env and expandenv, for security reasons. We also added two special template functions: include and required. The include function allows you to bring in another template, and then pass the results to other template functions. Using the ‘include’ Function For example, this template snippet includes a template called mytpl, then lowercases the result, then wraps that in double quotes.

Values https://helm.sh/docs/intro/using_helm/#customizing-the-chart-before-installing To see what options are configurable on a chart, use helm show values: $ helm show values bitnami/wordpress ## Global Docker image parameters ## Please, note that this will override the image parameters, including dependencies, configured to use the global value ## Current available global Docker image parameters: imageRegistry and imagePullSecrets ## # global: # imageRegistry: myRegistryName # imagePullSecrets: # - myRegistryKeySecretName # storageClass: myStorageClass ## Bitnami WordPress image version ## ref: https://hub.

k8s headless svc k8s headless and dns https://kubernetes.io/docs/concepts/services-networking/dns-pod-service/ A/AAAA records “Normal” (not headless) Services are assigned a DNS A or AAAA record, depending on the IP family of the service, for a name of the form my-svc.my-namespace.svc.cluster-domain.example. This resolves to the cluster IP of the Service. “Headless” (without a cluster IP) Services are also assigned a DNS A or AAAA record, depending on the IP family of the service, for a name of the form my-svc.

https://banzaicloud.com/blog/istio-mixerless-telemetry/ Because Istio Telemetry V2 lacks a central component (Mixer) with access to K8s metadata, the proxies themselves require the metadata necessary to provide rich metrics. Additionally, features provided by Mixer had to be added to the Envoy proxies to replace the Mixer-based telemetry. Istio Telemetry V2 uses two custom Envoy plugins to achieve just that. In-proxy service-level metrics in Telemetry V2 are provided by two custom plugins, metadata-exchange and stats.