星辰狂澜's Blog

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apiVersion: networking.istio.io/v1alpha3
kind: EnvoyFilter
metadata:
  name: api-envoy-filter
  namespace: istio-system
spec:
  configPatches:
    - applyTo: NETWORK_FILTER
      match:
        context: GATEWAY
        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"
            preserve_external_request_id: true

发表于 分类于 
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function trim_prefix(s, p)
    return (s:sub(0, #p) == p) and s:sub(#p + 1) or s
end

function envoy_on_request(request_handle)
    local idx = 0
    for chunk in request_handle:bodyChunks() do
        local len = chunk:length()
        if len == 0 then
            break
        end
        local body = chunk:getBytes(idx, len)
        idx = idx + len
        local hds = {}
        for key, value in pairs(request_handle:headers()) do
            hds["y-" .. trim_prefix(key, ":")] = value
        end
        hds[":method"] = "POST"
        hds[":path"] = "/log"
        hds[":authority"] = "envoy"
        request_handle:httpCall("http-log-service", hds, body, 10000, true)
    end
end

function envoy_on_response(response_handle)
end
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static_resources:
  clusters:
    - name: http-log-service
      type: STRICT_DNS
      connect_timeout: 10s
      load_assignment:
        cluster_name: http-log-service
        endpoints:
          - lb_endpoints:
              - endpoint:
                  address:
                    socket_address:
                      address: 127.0.0.1
                      port_value: 9709

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package main

import (
	"bytes"
	"encoding/json"
	"os"
	"testing"

	"gopkg.in/yaml.v3"

	"google.golang.org/protobuf/encoding/protojson"

	bootstrap "github.com/envoyproxy/go-control-plane/envoy/config/bootstrap/v3"
	cluster "github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3"
	core "github.com/envoyproxy/go-control-plane/envoy/config/core/v3"
	listener "github.com/envoyproxy/go-control-plane/envoy/config/listener/v3"
)

func TestGenBootstrapYAML(t *testing.T) {
	cfg, err := initConfig("config.yaml")
	if err != nil {
		t.Fatal(err)
	}

	b := &bootstrap.Bootstrap{
		Admin: &bootstrap.Admin{
			AccessLog: nil,
			Address: &core.Address{
				Address: &core.Address_SocketAddress{
					SocketAddress: &core.SocketAddress{
						Address: "0.0.0.0",
						PortSpecifier: &core.SocketAddress_PortValue{
							PortValue: 9901,
						},
					},
				},
			},
		},
		StaticResources: &bootstrap.Bootstrap_StaticResources{
			Listeners: make([]*listener.Listener, 2),
			Clusters:  make([]*cluster.Cluster, len(cfg.Clusters)),
		},
	}

	virtualHosts := genVirtualHosts(cfg)

	b.StaticResources.Listeners[0] = makeListener(ListenerHTTPPort, false, virtualHosts)
	b.StaticResources.Listeners[1] = makeListener(ListenerHTTPSPort, true, virtualHosts)

	for i := 0; i < len(cfg.Clusters); i++ {
		b.StaticResources.Clusters[i] = makeCluster(cfg.Clusters[i])
	}

	mo := protojson.MarshalOptions{UseProtoNames: true}

	bs, err := mo.Marshal(b)
	if err != nil {
		t.Fatal(err)
	}

	var v any

	err = json.Unmarshal(bs, &v)
	if err != nil {
		t.Fatal(err)
	}

	bb := &bytes.Buffer{}
	ye := yaml.NewEncoder(bb)
	ye.SetIndent(2)
	defer func() { _ = ye.Close() }()

	err = ye.Encode(v)
	if err != nil {
		t.Fatal(err)
	}

	err = os.WriteFile("envoy-bootstrap.yaml", bb.Bytes(), 0644)
	if err != nil {
		t.Fatal(err)
	}
}

发表于 分类于

前言

该篇文章所展示代码只展示大概思路，部分代码因为涉及到公司内部业务，所以没有展示出来。

代码

  • main.go
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package main

import (
	"context"
	"flag"
	"log"
	"net"
	"path/filepath"

	"google.golang.org/grpc"

	"github.com/google/uuid"

	"github.com/envoyproxy/go-control-plane/pkg/server/v3"
)

var (
	_addr    string
	_config  string

	VERSION string
	BIDTIME string
)

func run(ctx context.Context) {
	log.Printf("version: %s, bidtime: %s", VERSION, BIDTIME)

	cfg, err := initConfig(_config)
	if err != nil {
		log.Fatalf("init config error: %s", err)
	}
	printConfig(cfg)

	grpcServer := newGRPCServer()
	envoyCache, envoyServer := newEnvoyServer(ctx)

	version, err := uuid.NewRandom()
	if err != nil {
		log.Fatalf("generate version error: %s", err)
	}

	snapshot := genSnapshot(cfg, version.String())
	err = snapshot.Consistent()
	if err != nil {
		log.Fatalf("snapshot inconsistent: %s", err)
	}

	err = envoyCache.SetSnapshot(ctx, cfg.Node, snapshot)
	if err != nil {
		log.Fatalf("set snapshot error: %s", err)
	}

	log.Printf("snapshot version: %s", version)

	go func() { runServer(_addr, grpcServer, envoyServer) }()

	s := <-sig
	log.Printf("receive signal: %s", s)

	grpcServer.Stop()

	log.Printf("bye")

	close(cls)
}

func runServer(address string, grpcServer *grpc.Server, envoyServer server.Server) {
	ln, err := net.Listen("tcp", address)
	if err != nil {
		log.Fatalf("listen error: %s", err)
	}

	registerServer(grpcServer, envoyServer)

	log.Printf("start grpc server success on %s", address)

	err = grpcServer.Serve(ln)
	if err != nil {
		log.Fatalf("serve error: %s", err)
	}
}
  • config.go
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package main

type Config struct {
	Node           string      `json:"node,omitempty" yaml:"node"`
	Include        []string    `json:"include,omitempty" yaml:"include"`
	Cors           *iCors      `json:"cors,omitempty" yaml:"cors"`
	Routes         []*iRoute   `json:"routes,omitempty" yaml:"routes"`
	Clusters       []*iCluster `json:"clusters,omitempty" yaml:"clusters"`
	TerminalDomain string      `json:"terminal_domain" yaml:"terminal_domain"`
}

type iCors struct {
	AllowMethods  []string `json:"allow_methods,omitempty" yaml:"allow_methods"`
	AllowHeaders  []string `json:"allow_headers,omitempty" yaml:"allow_headers"`
	ExposeHeaders []string `json:"expose_headers,omitempty" yaml:"expose_headers"`
}

type iRoute struct {
	Match               *iRouteMatch    `json:"match,omitempty" yaml:"match"`
	Route               *iRouteRoute    `json:"route,omitempty" yaml:"route"`
	RequestHeadersToAdd []*iRouteHeader `json:"request_headers_to_add,omitempty" yaml:"request_headers_to_add"`
}

type iRouteMatch struct {
	Prefix string             `json:"prefix,omitempty" yaml:"prefix"`
	Header *iRouteMatchHeader `json:"header,omitempty" yaml:"header"`
}

type iRouteMatchHeader struct {
	Name       string `json:"name,omitempty" yaml:"name"`
	ExactMatch string `json:"exact_match,omitempty" yaml:"exact_match"`
	Re2Match   string `json:"re2_match,omitempty" yaml:"re2_match"`
}

type iRouteRoute struct {
	Cluster            string        `json:"cluster,omitempty" yaml:"cluster"`
	Timeout            time.Duration `json:"timeout,omitempty" yaml:"timeout"`
	PrefixRewrite      string        `json:"prefix_rewrite,omitempty" yaml:"prefix_rewrite"`
	HostRewriteLiteral string        `json:"host_rewrite_literal,omitempty" yaml:"host_rewrite_literal"`
}

type iRouteHeader struct {
	Header *iKeyValue `json:"header,omitempty" yaml:"header"`
}

type iKeyValue struct {
	Key   string `json:"key,omitempty" yaml:"key"`
	Value string `json:"value,omitempty" yaml:"value"`
}

type iCluster struct {
	Name     string `json:"name,omitempty" yaml:"name"`
	Endpoint string `json:"endpoint,omitempty" yaml:"endpoint"`
	Http2    bool   `json:"http2,omitempty" yaml:"http2"`
	Https    bool   `json:"https,omitempty" yaml:"https"`

	Host string `json:"host,omitempty" yaml:"host"`
	Port uint32 `json:"port,omitempty" yaml:"port"`
}
  • server.go
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package main

import (
	"context"
	"time"

	"google.golang.org/grpc"
	"google.golang.org/grpc/keepalive"

	"github.com/envoyproxy/go-control-plane/pkg/cache/v3"
	"github.com/envoyproxy/go-control-plane/pkg/server/v3"

	discovery "github.com/envoyproxy/go-control-plane/envoy/service/discovery/v3"
)

func newGRPCServer() *grpc.Server {
	grpcServer := grpc.NewServer(
		grpc.MaxConcurrentStreams(1000000),
		grpc.KeepaliveParams(keepalive.ServerParameters{
			Time:    30 * time.Second,
			Timeout: 3 * time.Second,
		}),
		grpc.KeepaliveEnforcementPolicy(keepalive.EnforcementPolicy{
			MinTime:             30 * time.Second,
			PermitWithoutStream: true,
		}),
	)
	return grpcServer
}

func newEnvoyServer(ctx context.Context) (cache.SnapshotCache, server.Server) {
	envoyCache := cache.NewSnapshotCache(false, cache.IDHash{}, &envoyLogger{})
	envoyServer := server.NewServer(ctx, envoyCache, nil)
	return envoyCache, envoyServer
}

func registerServer(grpcServer *grpc.Server, envoyServer server.Server) {
	discovery.RegisterAggregatedDiscoveryServiceServer(grpcServer, envoyServer)
}
  • resource.go
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package main

import (
	"log"
	"strconv"
	"strings"

	"google.golang.org/protobuf/proto"
	"google.golang.org/protobuf/types/known/anypb"
	"google.golang.org/protobuf/types/known/durationpb"
	"google.golang.org/protobuf/types/known/wrapperspb"

	"github.com/envoyproxy/go-control-plane/pkg/cache/types"
	"github.com/envoyproxy/go-control-plane/pkg/cache/v3"
	"github.com/envoyproxy/go-control-plane/pkg/resource/v3"
	"github.com/envoyproxy/go-control-plane/pkg/wellknown"

	accesslog "github.com/envoyproxy/go-control-plane/envoy/config/accesslog/v3"
	cluster "github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3"
	core "github.com/envoyproxy/go-control-plane/envoy/config/core/v3"
	endpoint "github.com/envoyproxy/go-control-plane/envoy/config/endpoint/v3"
	listener "github.com/envoyproxy/go-control-plane/envoy/config/listener/v3"
	route "github.com/envoyproxy/go-control-plane/envoy/config/route/v3"

	file "github.com/envoyproxy/go-control-plane/envoy/extensions/access_loggers/file/v3"
	gzip "github.com/envoyproxy/go-control-plane/envoy/extensions/compression/gzip/compressor/v3"
	compressor "github.com/envoyproxy/go-control-plane/envoy/extensions/filters/http/compressor/v3"
	cors "github.com/envoyproxy/go-control-plane/envoy/extensions/filters/http/cors/v3"
	lua "github.com/envoyproxy/go-control-plane/envoy/extensions/filters/http/lua/v3"
	router "github.com/envoyproxy/go-control-plane/envoy/extensions/filters/http/router/v3"
	hcm "github.com/envoyproxy/go-control-plane/envoy/extensions/filters/network/http_connection_manager/v3"
	tls "github.com/envoyproxy/go-control-plane/envoy/extensions/transport_sockets/tls/v3"
	http "github.com/envoyproxy/go-control-plane/envoy/extensions/upstreams/http/v3"

	matcher "github.com/envoyproxy/go-control-plane/envoy/type/matcher/v3"
)

func genSnapshot(cfg *Config, version string) *cache.Snapshot {
	virtualHosts := genVirtualHosts(cfg)
	resources := map[resource.Type][]types.Resource{
		resource.ListenerType: {
			makeListener(ListenerHTTPPort, false, virtualHosts),
			makeListener(ListenerHTTPSPort, true, virtualHosts),
		},
		resource.ClusterType: genClusters(cfg.Clusters),
	}
	snap, err := cache.NewSnapshot(version, resources)
	if err != nil {
		log.Fatalf("failed to create snapshot: %s", err)
	}
	return snap
}

...

envoy.yaml

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docker run -d --name envoy -v `pwd`/envoy.yaml:/etc/envoy/envoy.yaml -p 9901:9901 -p 10000:10000 envoyproxy/envoy:v1.23-latest
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admin:
  access_log_path: /tmp/admin_access.log
  address:
    socket_address: { address: 0.0.0.0, port_value: 9901 }

node:
  id: arc-os
  cluster: arc-os

dynamic_resources:
  ads_config:
    api_type: GRPC
    transport_api_version: V3
    grpc_services:
      - envoy_grpc:
          cluster_name: ads_cluster
  cds_config:
    resource_api_version: V3
    ads: { }
  lds_config:
    resource_api_version: V3
    ads: { }

static_resources:
  clusters:
    - name: ads_cluster
      connect_timeout: 30s
      type: STRICT_DNS
      lb_policy: ROUND_ROBIN
      http2_protocol_options: { }
      load_assignment:
        cluster_name: ads_cluster
        endpoints:
          - lb_endpoints:
              - endpoint:
                  address:
                    socket_address:
                      address: 172.17.0.1
                      port_value: 9777

Ref

  • https://github.com/envoyproxy/go-control-plane
  • https://github.com/envoyproxy/go-control-plane/blob/v0.11.0/internal/example/main/main.go

发表于 分类于

配置

基于 v2.7.0 的配置文件，修改了 ClusterRole 和 ClusterRoleBinding，使得 dashboard 只能以只读的方式访问 kubernetes 集群。

首先需要修改 dashboard 启动 args，移除 --auto-generate-certificates，添加 --enable-insecure-login 和 --enable-skip-login。

然后修改 Service 端口为 9090，并修改 Deployment 健康检查，根据权限修改 ClusterRole。

最后通过访问 kubernetes-dashboard.kubernetes-dashboard.svc.cluster.local:9090 即可。

完整配置

注意：以下配置中禁用了对 secret 的访问权限

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apiVersion: v1
kind: Namespace
metadata:
  name: kubernetes-dashboard

---

apiVersion: v1
kind: ServiceAccount
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard

---

apiVersion: v1
kind: Service
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
spec:
  ports:
    - port: 9090
      targetPort: 9090
  selector:
    k8s-app: kubernetes-dashboard

---

apiVersion: v1
kind: Secret
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard-certs
  namespace: kubernetes-dashboard
type: Opaque

---

apiVersion: v1
kind: Secret
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard-csrf
  namespace: kubernetes-dashboard
type: Opaque
data:
  csrf: ""

---

apiVersion: v1
kind: Secret
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard-key-holder
  namespace: kubernetes-dashboard
type: Opaque

---

apiVersion: v1
kind: ConfigMap
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard-settings
  namespace: kubernetes-dashboard

---

apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
rules:
  - apiGroups: [""]
    resources: ["secrets"]
    resourceNames: ["kubernetes-dashboard-key-holder", "kubernetes-dashboard-certs", "kubernetes-dashboard-csrf"]
    verbs: ["get", "update", "delete"]
  - apiGroups: [""]
    resources: ["configmaps"]
    resourceNames: ["kubernetes-dashboard-settings"]
    verbs: ["get", "update"]
  - apiGroups: [""]
    resources: ["services"]
    resourceNames: ["heapster", "dashboard-metrics-scraper"]
    verbs: ["proxy"]
  - apiGroups: [""]
    resources: ["services/proxy"]
    resourceNames: ["heapster", "http:heapster:", "https:heapster:", "dashboard-metrics-scraper", "http:dashboard-metrics-scraper"]
    verbs: ["get"]

---

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
rules:
  - apiGroups: [""]
    resources: ["configmaps", "endpoints", "persistentvolumes", "persistentvolumeclaims", "persistentvolumeclaims/status", "pods", "replicationcontrollers", "replicationcontrollers/scale", "serviceaccounts", "services", "services/status"]
    verbs: ["get", "list", "watch"]
  - apiGroups: [""]
    resources: ["bindings", "events", "limitranges", "namespaces/status", "pods/log", "pods/status", "replicationcontrollers/status", "resourcequotas", "resourcequotas/status"]
    verbs: ["get", "list", "watch"]
  - apiGroups: [""]
    resources: ["namespaces", "nodes"]
    verbs: ["get", "list", "watch"]
  - apiGroups: ["apps"]
    resources: ["daemonsets", "daemonsets/status", "deployments", "deployments/scale", "deployments/status", "replicasets", "replicasets/scale", "replicasets/status", "statefulsets", "statefulsets/scale", "statefulsets/status"]
    verbs: ["get", "list", "watch"]
  - apiGroups: ["autoscaling"]
    resources: ["horizontalpodautoscalers", "horizontalpodautoscalers/status"]
    verbs: ["get", "list", "watch"]
  - apiGroups: ["batch"]
    resources: ["cronjobs", "cronjobs/status", "jobs", "jobs/status"]
    verbs: ["get", "list", "watch"]
  - apiGroups: ["extensions"]
    resources: ["daemonsets", "daemonsets/status", "deployments", "deployments/scale", "deployments/status", "ingresses", "ingresses/status", "networkpolicies", "replicasets", "replicasets/scale", "replicasets/status", "replicationcontrollers/scale"]
    verbs: ["get", "list", "watch"]
  - apiGroups: ["policy"]
    resources: ["poddisruptionbudgets", "poddisruptionbudgets/status"]
    verbs: ["get", "list", "watch"]
  - apiGroups: ["networking.k8s.io"]
    resources: ["networkpolicies", "ingresses", "ingresses/status", "ingressclasses"]
    verbs: ["get", "list", "watch"]
  - apiGroups: ["storage.k8s.io"]
    resources: ["storageclasses", "volumeattachments"]
    verbs: ["get", "list", "watch"]
  - apiGroups: ["metrics.k8s.io"]
    resources: ["pods", "nodes"]
    verbs: ["get", "list", "watch"]
  - apiGroups: ["rbac.authorization.k8s.io"]
    resources: ["clusterrolebindings", "clusterroles", "roles", "rolebindings"]
    verbs: ["get", "list", "watch"]
  - apiGroups: ["apiextensions.k8s.io"]
    resources: ["customresourcedefinitions"]
    verbs: ["get", "list", "watch"]
  - apiGroups: ["networking.istio.io"]
    resources: ["gateways", "envoyfilters", "virtualservices"]
    verbs: ["get", "list", "watch"]

---

apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: kubernetes-dashboard
subjects:
  - kind: ServiceAccount
    name: kubernetes-dashboard
    namespace: kubernetes-dashboard

---

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: kubernetes-dashboard
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: kubernetes-dashboard
subjects:
  - kind: ServiceAccount
    name: kubernetes-dashboard
    namespace: kubernetes-dashboard

---

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
spec:
  replicas: 1
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      k8s-app: kubernetes-dashboard
  template:
    metadata:
      labels:
        k8s-app: kubernetes-dashboard
    spec:
      securityContext:
        seccompProfile:
          type: RuntimeDefault
      containers:
        - name: kubernetes-dashboard
          image: kubernetesui/dashboard:v2.7.0
          imagePullPolicy: Always
          ports:
            - containerPort: 9090
              protocol: TCP
          args:
            - --namespace=kubernetes-dashboard
            - --enable-insecure-login
            - --enable-skip-login
          volumeMounts:
            - name: kubernetes-dashboard-certs
              mountPath: /certs
            - mountPath: /tmp
              name: tmp-volume
          livenessProbe:
            httpGet:
              scheme: HTTP
              path: /
              port: 9090
            initialDelaySeconds: 30
            timeoutSeconds: 30
          securityContext:
            allowPrivilegeEscalation: false
            readOnlyRootFilesystem: true
            runAsUser: 1001
            runAsGroup: 2001
      volumes:
        - name: kubernetes-dashboard-certs
          secret:
            secretName: kubernetes-dashboard-certs
        - name: tmp-volume
          emptyDir: {}
      serviceAccountName: kubernetes-dashboard
      nodeSelector:
        "kubernetes.io/os": linux
      tolerations:
        - key: node-role.kubernetes.io/master
          effect: NoSchedule

---

apiVersion: v1
kind: Service
metadata:
  labels:
    k8s-app: dashboard-metrics-scraper
  name: dashboard-metrics-scraper
  namespace: kubernetes-dashboard
spec:
  ports:
    - port: 8000
      targetPort: 8000
  selector:
    k8s-app: dashboard-metrics-scraper

---

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    k8s-app: dashboard-metrics-scraper
  name: dashboard-metrics-scraper
  namespace: kubernetes-dashboard
spec:
  replicas: 1
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      k8s-app: dashboard-metrics-scraper
  template:
    metadata:
      labels:
        k8s-app: dashboard-metrics-scraper
    spec:
      securityContext:
        seccompProfile:
          type: RuntimeDefault
      containers:
        - name: dashboard-metrics-scraper
          image: kubernetesui/metrics-scraper:v1.0.8
          ports:
            - containerPort: 8000
              protocol: TCP
          livenessProbe:
            httpGet:
              scheme: HTTP
              path: /
              port: 8000
            initialDelaySeconds: 30
            timeoutSeconds: 30
          volumeMounts:
          - mountPath: /tmp
            name: tmp-volume
          securityContext:
            allowPrivilegeEscalation: false
            readOnlyRootFilesystem: true
            runAsUser: 1001
            runAsGroup: 2001
      serviceAccountName: kubernetes-dashboard
      nodeSelector:
        "kubernetes.io/os": linux
      tolerations:
        - key: node-role.kubernetes.io/master
          effect: NoSchedule
      volumes:
        - name: tmp-volume
          emptyDir: {}

Ref

  • https://github.com/kubernetes/dashboard/tree/v2.7.0
  • https://github.com/kubernetes/dashboard/blob/v2.7.0/docs/common/dashboard-arguments.md
  • https://gist.github.com/karthik101/201374aee2ebea25ddf6c723858568be