介绍
Kong 微服务网关。如果您正在为web、移动或物联网(IoT)进行构建，那么您可能最终需要通用的功能来运行实际的软件。Kong可以充当微服务请求的网关(或sidecar)，同时通过插件提供负载平衡、日志记录、身份验证、速率限制、转换等功能。
前提
- Kubernetes cluster:你可以使用Minikube 或者 GKE 集群。Kong 兼容所有kubernetes。我使用的是通过Docker Desktop搭建的本地集群。
- kubectl access: 您应该安装并配置kubectl，以便与Kubernetes集群通信。
注：Kong 安装过程中，需要通过LoadBalancer类型暴露服务接口。所以在部署之前，需要部署MetalLB（公有云部署跳过此步）。
安装
YAML方式
新建kong.yaml文件，写入如下内容：
apiVersion: v1
kind: Namespace
metadata:
name: kong
---
apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
name: kongclusterplugins.configuration.konghq.com
spec:
additionalPrinterColumns:
- JSONPath: .plugin
description: Name of the plugin
name: Plugin-Type
type: string
- JSONPath: .metadata.creationTimestamp
description: Age
name: Age
type: date
- JSONPath: .disabled
description: Indicates if the plugin is disabled
name: Disabled
priority: 1
type: boolean
- JSONPath: .config
description: Configuration of the plugin
name: Config
priority: 1
type: string
group: configuration.konghq.com
names:
kind: KongClusterPlugin
plural: kongclusterplugins
shortNames:
- kcp
scope: Cluster
subresources:
status: {}
validation:
openAPIV3Schema:
properties:
config:
type: object
configFrom:
properties:
secretKeyRef:
properties:
key:
type: string
name:
type: string
namespace:
type: string
required:
- name
- namespace
- key
type: object
type: object
disabled:
type: boolean
plugin:
type: string
protocols:
items:
enum:
- http
- https
- grpc
- grpcs
- tcp
- tls
type: string
type: array
run_on:
enum:
- first
- second
- all
type: string
required:
- plugin
version: v1
---
apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
name: kongconsumers.configuration.konghq.com
spec:
additionalPrinterColumns:
- JSONPath: .username
description: Username of a Kong Consumer
name: Username
type: string
- JSONPath: .metadata.creationTimestamp
description: Age
name: Age
type: date
group: configuration.konghq.com
names:
kind: KongConsumer
plural: kongconsumers
shortNames:
- kc
scope: Namespaced
subresources:
status: {}
validation:
openAPIV3Schema:
properties:
credentials:
items:
type: string
type: array
custom_id:
type: string
username:
type: string
version: v1
---
apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
name: kongingresses.configuration.konghq.com
spec:
group: configuration.konghq.com
names:
kind: KongIngress
plural: kongingresses
shortNames:
- ki
scope: Namespaced
subresources:
status: {}
validation:
openAPIV3Schema:
properties:
proxy:
properties:
connect_timeout:
minimum: 0
type: integer
path:
pattern: ^/.*$
type: string
protocol:
enum:
- http
- https
- grpc
- grpcs
- tcp
- tls
type: string
read_timeout:
minimum: 0
type: integer
retries:
minimum: 0
type: integer
write_timeout:
minimum: 0
type: integer
type: object
route:
properties:
headers:
additionalProperties:
items:
type: string
type: array
type: object
https_redirect_status_code:
type: integer
methods:
items:
type: string
type: array
path_handling:
enum:
- v0
- v1
type: string
preserve_host:
type: boolean
protocols:
items:
enum:
- http
- https
- grpc
- grpcs
- tcp
- tls
type: string
type: array
regex_priority:
type: integer
snis:
items:
type: string
type: array
strip_path:
type: boolean
upstream:
properties:
algorithm:
enum:
- round-robin
- consistent-hashing
- least-connections
type: string
hash_fallback:
type: string
hash_fallback_header:
type: string
hash_on:
type: string
hash_on_cookie:
type: string
hash_on_cookie_path:
type: string
hash_on_header:
type: string
healthchecks:
properties:
active:
properties:
concurrency:
minimum: 1
type: integer
healthy:
properties:
http_statuses:
items:
type: integer
type: array
interval:
minimum: 0
type: integer
successes:
minimum: 0
type: integer
type: object
http_path:
pattern: ^/.*$
type: string
timeout:
minimum: 0
type: integer
unhealthy:
properties:
http_failures:
minimum: 0
type: integer
http_statuses:
items:
type: integer
type: array
interval:
minimum: 0
type: integer
tcp_failures:
minimum: 0
type: integer
timeout:
minimum: 0
type: integer
type: object
type: object
passive:
properties:
healthy:
properties:
http_statuses:
items:
type: integer
type: array
interval:
minimum: 0
type: integer
successes:
minimum: 0
type: integer
type: object
unhealthy:
properties:
http_failures:
minimum: 0
type: integer
http_statuses:
items:
type: integer
type: array
interval:
minimum: 0
type: integer
tcp_failures:
minimum: 0
type: integer
timeout:
minimum: 0
type: integer
type: object
type: object
threshold:
type: integer
type: object
host_header:
type: string
slots:
minimum: 10
type: integer
type: object
version: v1
---
apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
name: kongplugins.configuration.konghq.com
spec:
additionalPrinterColumns:
- JSONPath: .plugin
description: Name of the plugin
name: Plugin-Type
type: string
- JSONPath: .metadata.creationTimestamp
description: Age
name: Age
type: date
- JSONPath: .disabled
description: Indicates if the plugin is disabled
name: Disabled
priority: 1
type: boolean
- JSONPath: .config
description: Configuration of the plugin
name: Config
priority: 1
type: string
group: configuration.konghq.com
names:
kind: KongPlugin
plural: kongplugins
shortNames:
- kp
scope: Namespaced
subresources:
status: {}
validation:
openAPIV3Schema:
properties:
config:
type: object
configFrom:
properties:
secretKeyRef:
properties:
key:
type: string
name:
type: string
required:
- name
- key
type: object
type: object
disabled:
type: boolean
plugin:
type: string
protocols:
items:
enum:
- http
- https
- grpc
- grpcs
- tcp
- tls
type: string
type: array
run_on:
enum:
- first
- second
- all
type: string
required:
- plugin
version: v1
---
apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
name: tcpingresses.configuration.konghq.com
spec:
additionalPrinterColumns:
- JSONPath: .status.loadBalancer.ingress[*].ip
description: Address of the load balancer
name: Address
type: string
- JSONPath: .metadata.creationTimestamp
description: Age
name: Age
type: date
group: configuration.konghq.com
names:
kind: TCPIngress
plural: tcpingresses
scope: Namespaced
subresources:
status: {}
validation:
openAPIV3Schema:
properties:
apiVersion:
type: string
kind:
type: string
metadata:
type: object
spec:
properties:
rules:
items:
properties:
backend:
properties:
serviceName:
type: string
servicePort:
format: int32
type: integer
type: object
host:
type: string
port:
format: int32
type: integer
type: object
type: array
tls:
items:
properties:
hosts:
items:
type: string
type: array
secretName:
type: string
type: object
type: array
type: object
status:
type: object
version: v1beta1
status:
acceptedNames:
kind: ""
plural: ""
conditions: []
storedVersions: []
---
apiVersion: v1
kind: ServiceAccount
metadata:
name: kong-serviceaccount
namespace: kong
---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRole
metadata:
name: kong-ingress-clusterrole
rules:
- apiGroups:
- ""
resources:
- endpoints
- nodes
- pods
- secrets
verbs:
- list
- watch
- apiGroups:
- ""
resources:
- nodes
verbs:
- get
- apiGroups:
- ""
resources:
- services
verbs:
- get
- list
- watch
- apiGroups:
- networking.k8s.io
- extensions
- networking.internal.knative.dev
resources:
- ingresses
verbs:
- get
- list
- watch
- apiGroups:
- ""
resources:
- events
verbs:
- create
- patch
- apiGroups:
- networking.k8s.io
- extensions
- networking.internal.knative.dev
resources:
- ingresses/status
verbs:
- update
- apiGroups:
- configuration.konghq.com
resources:
- tcpingresses/status
verbs:
- update
- apiGroups:
- configuration.konghq.com
resources:
- kongplugins
- kongclusterplugins
- kongcredentials
- kongconsumers
- kongingresses
- tcpingresses
verbs:
- get
- list
- watch
- apiGroups:
- ""
resources:
- configmaps
verbs:
- create
- get
- update
---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
name: kong-ingress-clusterrole-nisa-binding
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: kong-ingress-clusterrole
subjects:
- kind: ServiceAccount
name: kong-serviceaccount
namespace: kong
---
apiVersion: v1
kind: Service
metadata:
annotations:
service.beta.kubernetes.io/aws-load-balancer-backend-protocol: tcp
service.beta.kubernetes.io/aws-load-balancer-type: nlb
name: kong-proxy
namespace: kong
spec:
ports:
- name: proxy
port: 80
protocol: TCP
targetPort: 8000
- name: proxy-ssl
port: 443
protocol: TCP
targetPort: 8443
selector:
app: ingress-kong
type: LoadBalancer
---
apiVersion: v1
kind: Service
metadata:
name: kong-validation-webhook
namespace: kong
spec:
ports:
- name: webhook
port: 443
protocol: TCP
targetPort: 8080
selector:
app: ingress-kong
---
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
app: ingress-kong
name: ingress-kong
namespace: kong
spec:
replicas: 1
selector:
matchLabels:
app: ingress-kong
template:
metadata:
annotations:
kuma.io/gateway: enabled
prometheus.io/port: "8100"
prometheus.io/scrape: "true"
traffic.sidecar.istio.io/includeInboundPorts: ""
labels:
app: ingress-kong
spec:
containers:
- env:
- name: KONG_PROXY_LISTEN
value: 0.0.0.0:8000, 0.0.0.0:8443 ssl http2
- name: KONG_PORT_MAPS
value: 80:8000, 443:8443
- name: KONG_ADMIN_LISTEN
value: 127.0.0.1:8444 ssl
- name: KONG_STATUS_LISTEN
value: 0.0.0.0:8100
- name: KONG_DATABASE
value: "off"
- name: KONG_NGINX_WORKER_PROCESSES
value: "2"
- name: KONG_ADMIN_ACCESS_LOG
value: /dev/stdout
- name: KONG_ADMIN_ERROR_LOG
value: /dev/stderr
- name: KONG_PROXY_ERROR_LOG
value: /dev/stderr
image: kong:2.2
lifecycle:
preStop:
exec:
command:
- /bin/sh
- -c
- kong quit
livenessProbe:
failureThreshold: 3
httpGet:
path: /status
port: 8100
scheme: HTTP
initialDelaySeconds: 5
periodSeconds: 10
successThreshold: 1
timeoutSeconds: 1
name: proxy
ports:
- containerPort: 8000
name: proxy
protocol: TCP
- containerPort: 8443
name: proxy-ssl
protocol: TCP
- containerPort: 8100
name: metrics
protocol: TCP
readinessProbe:
failureThreshold: 3
httpGet:
path: /status
port: 8100
scheme: HTTP
initialDelaySeconds: 5
periodSeconds: 10
successThreshold: 1
timeoutSeconds: 1
- env:
- name: CONTROLLER_KONG_ADMIN_URL
value: https://127.0.0.1:8444
- name: CONTROLLER_KONG_ADMIN_TLS_SKIP_VERIFY
value: "true"
- name: CONTROLLER_PUBLISH_SERVICE
value: kong/kong-proxy
- name: POD_NAME
valueFrom:
fieldRef:
apiVersion: v1
fieldPath: metadata.name
- name: POD_NAMESPACE
valueFrom:
fieldRef:
apiVersion: v1
fieldPath: metadata.namespace
image: kong-docker-kubernetes-ingress-controller.bintray.io/kong-ingress-controller:1.1
imagePullPolicy: IfNotPresent
livenessProbe:
failureThreshold: 3
httpGet:
path: /healthz
port: 10254
scheme: HTTP
initialDelaySeconds: 5
periodSeconds: 10
successThreshold: 1
timeoutSeconds: 1
name: ingress-controller
ports:
- containerPort: 8080
name: webhook
protocol: TCP
readinessProbe:
failureThreshold: 3
httpGet:
path: /healthz
port: 10254
scheme: HTTP
initialDelaySeconds: 5
periodSeconds: 10
successThreshold: 1
timeoutSeconds: 1
serviceAccountName: kong-serviceaccount
执行
kubectl apply -f kong.yaml
or
kubectl apply -f https://bit.ly/kong-ingress-dbless 【注：可能需要FQ】
重要提示：yaml内容不太适用于生产环境。你可以按照，下面的几个点进行调整。
- 副本数量：确保您正在运行多个Kong实例，以防止单个节点故障导致的中断。
- 资源配置：调整kong 实例，内存参数。
- Load-balancer: Ensure that you are running a Layer-4 or TCP based balancer in front of Kong. This allows Kong to serve a TLS certificate and integrate with a cert-manager.
使用
我们首先要部署一个简单的http服务。http-svc.yaml文件内容如下：
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: http-svc
spec:
replicas: 1
selector:
matchLabels:
app: http-svc
template:
metadata:
labels:
app: http-svc
spec:
containers:
- name: http-svc
image: cilium/echoserver
ports:
- containerPort: 8080
env:
- name: NODE_NAME
valueFrom:
fieldRef:
fieldPath: spec.nodeName
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
- name: POD_IP
valueFrom:
fieldRef:
fieldPath: status.podIP
---
apiVersion: v1
kind: Service
metadata:
name: http-svc
labels:
app: http-svc
spec:
type: NodePort
ports:
- port: 80
targetPort: 8080
protocol: TCP
name: http
selector:
app: http-svc
查看服务的nodepord接口，我们通过访问nodepode接口，验证服务是否可用。
我们接下来，如果要使用kong网关访问这个服务，那需要新增配置一个规则，就像nginx一样。新建http-ingress.yaml文件，内容如下：
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: demo-example-com
annotations:
kubernetes.io/ingress.class: kong
spec:
rules:
- host: haha.example.com
http:
paths:
- path: /bar
backend:
serviceName: http-svc
servicePort: 80
本地环境，需要配置本机host，将本机ip 指到 haha.example.com。到了这步，我们就可以通过 haha.example.com/bar 地址来访问http-svc服务。
本文参考：https://docs.konghq.com/gateway-oss/2.3.x/kong-for-kubernetes