Istio的流量管理(实操二)

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Istio的流量管理(实操二)

涵盖官方文档Traffic Management章节中的inrgess部分。

目录

Ingress网关

在kubernetes环境中，kubernetes ingress资源用于指定暴露到集群外的服务。在istio服务网格中，使用了一种不同的配置模型，称为istio网关。一个网关允许将istio的特性，如镜像和路由规则应用到进入集群的流量上。

本节描述了如何使用istio网关将一个服务暴露到服务网格外。

环境准备

使用如下命令创建httpbin服务

$ kubectl apply -f samples/httpbin/httpbin.yaml

确定ingress的IP和端口

由于本环境中没有配置对外的负载均衡，因此此处的EXTERNAL-IP为空，使用node port进行访问

# kubectl get svc istio-ingressgateway -n istio-system
NAME                    TYPE           CLUSTER-IP    EXTERNAL-IP  PORT(S)    AGE
istio-ingressgateway   LoadBalancer   10.84.93.45   <pending>     ...        11d

获取ingressgateway service的http2和https对应的端口

$ export INGRESS_PORT=$(kubectl -n istio-system get service istio-ingressgateway -o jsonpath='{.spec.ports[?(@.name=="http2")].nodePort}')
$ export SECURE_INGRESS_PORT=$(kubectl -n istio-system get service istio-ingressgateway -o jsonpath='{.spec.ports[?(@.name=="https")].nodePort}')
$ export TCP_INGRESS_PORT=$(kubectl -n istio-system get service istio-ingressgateway -o jsonpath='{.spec.ports[?(@.name=="tcp")].nodePort}')

下面是istio-system命名空间的istio-ingressgateway service中的一部分端口信息，可以看到http2和https的nodeport分别为31194和31785，对应上面的INGRESS_PORT和SECURE_INGRESS_PORT

{
    "name": "http2","nodePort": 31194,"port": 80,"protocol": "TCP","targetPort": 80
},{
    "name": "https","nodePort": 31785,"port": 443,"targetPort": 443
},

获取istio-system命名空间中ingressgateway pod 的hostIP

$ export INGRESS_HOST=$(kubectl get po -l istio=ingressgateway -n istio-system -o jsonpath='{.items[0].status.hostIP}')

使用istio网关配置ingress

一个ingress网关描述了在网格边缘用于接收入站HTTP/TCP连接的负载均衡，配置了暴露的端口，协议等。kubernetes ingress资源不包括任何流量路由配置。ingress 流量的路由使用istio路由规则，与内部服务请求相同：

  1. 创建istio Gateway，网关监听地址为httpbin.example.com，端口为80(位于默认的ingressgatewaypod中)

    kubectl apply -f - <<EOF
apiVersion: networking.istio.io/v1alpha3
kind: Gateway
Metadata:
  name: httpbin-gateway
spec:
  selector:
    istio: ingressgateway # use Istio default gateway implementation
  servers:
  - port:
      number: 80 #gateway暴露80端口
      name: http
      protocol: HTTP
    hosts: #gateway暴露的主机名
    - "httpbin.example.com"
EOF

  2. 通过Gateway配置进入的流量路由，将URI为httpbin.example.com，且目的地为/status或/delay的请求分发到httpbin服务的8000端口，其他请求会返回404响应。

    kubectl apply -f - <<EOF
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
Metadata:
  name: httpbin
spec:
  hosts: #virtual service的hosts字段与Gateway的servers.hosts字段需要匹配
  - "httpbin.example.com" 
  gateways:
  - httpbin-gateway
  http:
  - match:
    - uri:
        prefix: /status
    - uri:
        prefix: /delay
    route:
    - destination:
        port:
          number: 8000
        host: httpbin
EOF

    可以看到流量被导入了httpbin service暴露的8000端口上

    $ oc get svc |grep httpbin
httpbin       ClusterIP      10.84.222.69   <none>    8000/TCP   19h

    来自网格内部其他服务的请求则不受此规则的约束，会使用默认的轮询路由进行请求分发。为了限制内部的调用规则，可以将特定的值mesh添加到gateways列表中。由于内部服务主机名(如httpbin.default.svc.cluster.local) 可能与外部不同，因此需要将主机名添加到hosts列表中。

  3. 使用curl命令访问httpbin服务，此时通过-H选项修改了HTTP请求首部的Host字段，使用http2的nodeport方式访问：

    $ curl -s -I -HHost:httpbin.example.com http://$INGRESS_HOST:$INGRESS_PORT/status/200
HTTP/1.1 200 OK
server: istio-envoy
date: Thu,21 May 2020 03:22:50 GMT
content-type: text/html; charset=utf-8
access-control-allow-origin: *
access-control-allow-credentials: true
content-length: 0
x-envoy-upstream-service-time: 21

  4. 访问其他URL路径则返回404错误

    $ curl -s -I -HHost:httpbin.example.com http://$INGRESS_HOST:$INGRESS_PORT/headers
HTTP/1.1 404 Not Found
date: Thu,21 May 2020 03:25:20 GMT
server: istio-envoy
transfer-encoding: chunked

使用浏览器访问ingress服务

由于无法像使用curl一样修改请求的Host首部字段，因此无法使用浏览器访问httpbin服务。为了解决这个问题，可以在Gateway和VirtualService中的host字段使用通配符*。

$ kubectl apply -f - <<EOF
apiVersion: networking.istio.io/v1alpha3
kind: Gateway
Metadata:
  name: httpbin-gateway
spec:
  selector:
    istio: ingressgateway # use Istio default gateway implementation
  servers:
  - port:
      number: 80
      name: http
      protocol: HTTP
    hosts:
    - "*"  #指定通配符，监听所有流量，不限制外部流量的地址
---
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
Metadata:
  name: httpbin
spec:
  hosts:
  - "*"
  gateways:
  - httpbin-gateway
  http:
  - match:
    - uri:
        prefix: /headers
    route:
    - destination:
        port:
          number: 8000
        host: httpbin
EOF

问题定位

  1. 检查环境变量INGRESS_HOST和INGRESS_PORT，保证这两个值是有效的

    $ kubectl get svc -n istio-system
$ echo INGRESS_HOST=$INGRESS_HOST,INGRESS_PORT=$INGRESS_PORT

  2. 校验相同的端口上没有其他istio ingress网格

    $ kubectl get gateway --all-namespaces

  3. 校验没有在相同的IP和端口上定义kubernetes ingress资源

    $ kubectl get ingress --all-namespaces

  4. 如果没有负载均衡，可以参照上面步骤使用node port方式

卸载

$ kubectl delete gateway httpbin-gateway
$ kubectl delete virtualservice httpbin
$ kubectl delete --ignore-not-found=true -f samples/httpbin/httpbin.yaml

Ingress(kubernetes)

执行ingress流量控制中的Before you begin和Determining the ingress IP and ports小节的操作，部署httpbin服务。本节介绍如何通过kubernetes的Ingress(非istio的gateway)进行访问。

下面展示如何配置一个80端口的Ingress，用于HTTP流量：

  1. 创建一个istio Gateway，将来自httpbin.example.com:80/status/*的流量分发到service httpbin的8000端口

    $ kubectl apply -f - <<EOF
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
Metadata:
  annotations:
    kubernetes.io/ingress.class: istio
  name: ingress
spec:
  rules:
  - host: httpbin.example.com
    http:
      paths:
      - path: /status/*
        backend:
          serviceName: httpbin
          servicePort: 8000
EOF

    注意需要使用 kubernetes.io/ingress.class annotation来告诉istio网关控制器处理该ingress，否则会忽略该ingress。

  2. 使用curl命令访问httpbin服务。Ingress的流量也需要经过istio ingressgateway。

    $ curl -I -HHost:httpbin.example.com http://$INGRESS_HOST:$INGRESS_PORT/status/200
HTTP/1.1 200 OK
server: istio-envoy
date: Fri,22 May 2020 06:12:56 GMT
content-type: text/html; charset=utf-8
access-control-allow-origin: *
access-control-allow-credentials: true
content-length: 0
x-envoy-upstream-service-time: 20

    httpbin的服务发现是通过EDS实现的，使用如下命令查看：

    $ istioctl proxy-config cluster istio-ingressgateway-569669bb67-b6p5r|grep 8000
httpbin.default.svc.cluster.local                   8000    -    outbound      EDS
outbound_.8000_._.httpbin.default.svc.cluster.local   -     -       -          EDS

  3. 访问其他未暴露的路径，返回HTTP 404错误：

    $ curl -I -HHost:httpbin.example.com http://$INGRESS_HOST:$INGRESS_PORT/headers
HTTP/1.1 404 Not Found
date: Fri,22 May 2020 06:24:30 GMT
server: istio-envoy
transfer-encoding: chunked

下一步

TLS

Ingress支持TLS设置。Istio也支持TLS设置，但相关的secret必须存在istio-ingressgateway deployment所在的命名空间中。可以使用cert-manager生成这些证书。

指定路径类型

默认情况下，Istio会将路径视为完全匹配，如果路径使用/*或*结尾，则该路径为前缀匹配。不支持其他正则匹配。

kubernetes 1.18中新增了一个字段pathType，允许声明为Exact或Prefix。

指定IngressClass

kubernetes 1.18中新增了一个资源IngressClass，替换了Ingress资源的 kubernetes.io/ingress.class annotation。如果使用该资源，则需要将controller设置为istio.io/ingress-controller：

apiVersion: networking.k8s.io/v1beta1
kind: IngressClass
Metadata:
  name: istio
spec:
  controller: istio.io/ingress-controller
---
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
Metadata:
  name: ingress
spec:
  ingressClassName: istio
  ...

卸载

$ kubectl delete ingress ingress
$ kubectl delete --ignore-not-found=true -f samples/httpbin/httpbin.yaml

安全网关

本节讲述如何使用simple或mutual TLS暴露安全的HTTPS服务。证书是通过SDS进行密钥发现的。

TLS需要的私钥，服务端证书，根证书是使用基于文件装载的方法配置的。

执行ingress流量控制中的Before you begin和Determining the ingress IP and ports小节的操作，部署httpbin服务，并获取 INGRESS_HOST 和SECURE_INGRESS_PORT变量。

生成服务端证书和私钥

下面使用openssl生成需要的证书和密钥

  1. 生成一个根证书和一个私钥，用于签名服务的证书

    $ openssl req -x509 -sha256 -nodes -days 365 -newkey rsa:2048 -subj '/O=example Inc./CN=example.com' -keyout example.com.key -out example.com.crt

  2. 为 httpbin.example.com生成一个证书和私钥

    $ openssl req -out httpbin.example.com.csr -newkey rsa:2048 -nodes -keyout httpbin.example.com.key -subj "/CN=httpbin.example.com/O=httpbin organization"
$ openssl x509 -req -days 365 -CA example.com.crt -CAkey example.com.key -set_serial 0 -in httpbin.example.com.csr -out httpbin.example.com.crt

单主机配置TLS ingress网关

  1. 为ingree网关创建一个secret

    secret的名字不能以istio或prometheus开头，且secret不应该包含token字段

    $ kubectl create -n istio-system secret tls httpbin-credential --key=httpbin.example.com.key --cert=httpbin.example.com.crt

  2. 在server部分定义一个443端口的Gateway，将credentialName指定为httpbin-credential，与secret的名字相同，TLS的mode为SIMPLE。

    $ cat <<EOF | kubectl apply -f -
apiVersion: networking.istio.io/v1alpha3
kind: Gateway
Metadata:
  name: mygateway
spec:
  selector:
    istio: ingressgateway # use istio default ingress gateway
  servers:
  - port:
      number: 443
      name: https
      protocol: HTTPS
    tls: #对暴露的服务使用SIMPLE模式的tls，即单向tls验证
      mode: SIMPLE
      credentialName: httpbin-credential # must be the same as secret
    hosts:
    - httpbin.example.com
EOF

  3. 配置进入Gateway的流量路由。与上一节中的VirtualService相同

    $ kubectl apply -f - <<EOF
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
Metadata:
  name: httpbin
spec:
  hosts:
  - "httpbin.example.com"
  gateways:
  - httpbin-gateway
  http:
  - match:
    - uri:
        prefix: /status
    - uri:
        prefix: /delay
    route:
    - destination:
        port:
          number: 8000  #可以看到tls只是这是在gateway上的，当进入网格之后就不需要了
        host: httpbin
EOF

  4. 使用curl向SECURE_INGRESS_PORT发送HTTPS请求访问httpbin服务，请求中携带了公钥example.com.crt 。--resolve标记可以在使用curl访问TLS的网关IP时，在SNI中支持httpbin.example.com。--cacert选择支持使用生成的证书校验服务。

    -HHost:httpbin.example.com 选项仅在SECURE_INGRESS_PORT不同于实际的网关端口(443)时才会需要，例如，通过映射的NodePort方式访问服务时。

    通过将请求发送到/status/418 URL路径时，可以看到httpbin确实被访问了，httpbin服务会返回418 I’m a Teapot代码。.

    $ curl -v -HHost:httpbin.example.com --resolve "httpbin.example.com:$SECURE_INGRESS_PORT:$INGRESS_HOST" \
--cacert example.com.crt "https://httpbin.example.com:$SECURE_INGRESS_PORT/status/418"

> --cacert example.com.crt "https://httpbin.example.com:$SECURE_INGRESS_PORT/status/418"
* Added httpbin.example.com:31967:172.20.127.211 to DNS cache
* About to connect() to httpbin.example.com port 31967 (#0)
*   Trying 172.20.127.211...
* Connected to httpbin.example.com (172.20.127.211) port 31967 (#0)
* Initializing NSS with certpath: sql:/etc/pki/nssdb
*   CAfile: example.com.crt
  CApath: none
* SSL connection using TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
* Server certificate:
*       subject: O=httpbin organization,CN=httpbin.example.com
*       start date: May 22 09:03:01 2020 GMT
*       expire date: May 22 09:03:01 2021 GMT
*       common name: httpbin.example.com
*       issuer: CN=example.com,O=example Inc.
> GET /status/418 HTTP/1.1
> User-Agent: curl/7.29.0
> Accept: */*
> Host:httpbin.example.com
>
< HTTP/1.1 418 Unknown
< server: istio-envoy
< date: Fri,22 May 2020 09:08:29 GMT
< x-more-info: http://tools.ietf.org/html/rfc2324
< access-control-allow-origin: *
< access-control-allow-credentials: true
< content-length: 135
< x-envoy-upstream-service-time: 2
<

    -=[ teapot ]=-

       _...._
     .'  _ _ `.
    | ."` ^ `". _,\_;`"---"`|//
      |       ;/
      \_     _/
        `"""`
* Connection #0 to host httpbin.example.com left intact

    查看curl输出中的Server certificate中的信息，上述返回值的最后有一个茶壶的图片，说明运行成功。

  5. 删除老的网关secret，创建一个新的secret，并使用该secret修改ingress网关的凭据

    $ kubectl -n istio-system delete secret httpbin-credential

    $ mkdir new_certificates
$ openssl req -x509 -sha256 -nodes -days 365 -newkey rsa:2048 -subj '/O=example Inc./CN=example.com' -keyout new_certificates/example.com.key -out new_certificates/example.com.crt
$ openssl req -out new_certificates/httpbin.example.com.csr -newkey rsa:2048 -nodes -keyout new_certificates/httpbin.example.com.key -subj "/CN=httpbin.example.com/O=httpbin organization"
$ openssl x509 -req -days 365 -CA new_certificates/example.com.crt -CAkey new_certificates/example.com.key -set_serial 0 -in new_certificates/httpbin.example.com.csr -out new_certificates/httpbin.example.com.crt
$ kubectl create -n istio-system secret tls httpbin-credential \
--key=new_certificates/httpbin.example.com.key \
--cert=new_certificates/httpbin.example.com.crt

  6. 使用新的证书链访问httpbin服务

    $ curl -v -HHost:httpbin.example.com --resolve "httpbin.example.com:$SECURE_INGRESS_PORT:$INGRESS_HOST" \
--cacert new_certificates/example.com.crt "https://httpbin.example.com:$SECURE_INGRESS_PORT/status/418"

  7. 如果使用老的证书访问，则返回错误

    $ curl -v -HHost:httpbin.example.com --resolve "httpbin.example.com:$SECURE_INGRESS_PORT:$INGRESS_HOST" \
> --cacert example.com.crt "https://httpbin.example.com:$SECURE_INGRESS_PORT/status/418"
* Added httpbin.example.com:31967:172.20.127.211 to DNS cache
* About to connect() to httpbin.example.com port 31967 (#0)
*   Trying 172.20.127.211...
* Connected to httpbin.example.com (172.20.127.211) port 31967 (#0)
* Initializing NSS with certpath: sql:/etc/pki/nssdb
*   CAfile: example.com.crt
  CApath: none
* Server certificate:
*       subject: O=httpbin organization,CN=httpbin.example.com
*       start date: May 22 09:24:07 2020 GMT
*       expire date: May 22 09:24:07 2021 GMT
*       common name: httpbin.example.com
*       issuer: CN=example.com,O=example Inc.
* NSS error -8182 (SEC_ERROR_BAD_SIGNATURE)
* Peer's certificate has an invalid signature.
* Closing connection 0
curl: (60) Peer's certificate has an invalid signature.

多主机配置TLS ingress网关

本节会为多个主机(httpbin.example.com和helloworld-v1.example.com)配置一个ingress网关。ingress网关会在credentialName中查找唯一的凭据。

  1. 删除之前创建的secret并为httpbin重建凭据

    $ kubectl -n istio-system delete secret httpbin-credential
$ kubectl create -n istio-system secret tls httpbin-credential \
--key=httpbin.example.com.key \
--cert=httpbin.example.com.crt

  2. 启动helloworld-v1

    $ cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: Service
Metadata:
  name: helloworld-v1
  labels:
    app: helloworld-v1
spec:
  ports:
  - name: http
    port: 5000
  selector:
    app: helloworld-v1
---
apiVersion: apps/v1
kind: Deployment
Metadata:
  name: helloworld-v1
spec:
  replicas: 1
  selector:
    matchLabels:
      app: helloworld-v1
      version: v1
  template:
    Metadata:
      labels:
        app: helloworld-v1
        version: v1
    spec:
      containers:
      - name: helloworld
        image: istio/examples-helloworld-v1
        resources:
          requests:
            cpu: "100m"
        imagePullPolicy: IfNotPresent #Always
        ports:
        - containerPort: 5000
EOF

  3. 为helloworld-v1.example.com创建证书和私钥

    $ openssl req -out helloworld-v1.example.com.csr -newkey rsa:2048 -nodes -keyout helloworld-v1.example.com.key -subj "/CN=helloworld-v1.example.com/O=helloworld organization"
$ openssl x509 -req -days 365 -CA example.com.crt -CAkey example.com.key -set_serial 1 -in helloworld-v1.example.com.csr -out helloworld-v1.example.com.crt

  4. 为helloworld-credential创建secret

    $ kubectl create -n istio-system secret tls helloworld-credential --key=helloworld-v1.example.com.key --cert=helloworld-v1.example.com.crt

  5. 定义一个网关，网关端口为443。在credentialName字段分别设置httpbin-credential和helloworld-credential，TLS模式为SIMPLE。

    $ cat <<EOF | kubectl apply -f -
apiVersion: networking.istio.io/v1alpha3
kind: Gateway
Metadata:
  name: mygateway
spec:
  selector:
    istio: ingressgateway # use istio default ingress gateway
  servers:
  - port:
      number: 443
      name: https-httpbin #httpbin的gateway配置
      protocol: HTTPS
    tls:
      mode: SIMPLE
      credentialName: httpbin-credential
    hosts:
    - httpbin.example.com
  - port:
      number: 443
      name: https-helloworld #https-helloword的gateway配置
      protocol: HTTPS
    tls:
      mode: SIMPLE
      credentialName: helloworld-credential
    hosts:
    - helloworld-v1.example.com
EOF

  6. 配置gateway的流量路由，为新应用添加对应的virtual service

    $ cat <<EOF | kubectl apply -f -
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
Metadata:
  name: helloworld-v1
spec:
  hosts:
  - helloworld-v1.example.com
  gateways:
  - mygateway
  http:
  - match:
    - uri:
        exact: /hello
    route:
    - destination:
        host: helloworld-v1
        port:
          number: 5000
EOF

  7. 向helloworld-v1.example.com发送HTTPS请求

    $ curl -v -HHost:helloworld-v1.example.com --resolve "helloworld-v1.example.com:$SECURE_INGRESS_PORT:$INGRESS_HOST" \
--cacert example.com.crt "https://helloworld-v1.example.com:$SECURE_INGRESS_PORT/hello"

...
< HTTP/1.1 200 OK
< content-type: text/html; charset=utf-8
< content-length: 60
< server: istio-envoy
< date: Sat,23 May 2020 07:38:40 GMT
< x-envoy-upstream-service-time: 143
<
Hello version: v1,instance: helloworld-v1-5dfcf5d5cd-2l44c
* Connection #0 to host helloworld-v1.example.com left intact

  8. 向 httpbin.example.com发送请求

    $ curl -v -HHost:httpbin.example.com --resolve "httpbin.example.com:$SECURE_INGRESS_PORT:$INGRESS_HOST" \
--cacert example.com.crt "https://httpbin.example.com:$SECURE_INGRESS_PORT/status/418"

 ...
    -=[ teapot ]=-

       _...._
     .'  _ _ `.
    | ."` ^ `". _,\_;`"---"`|//
      |       ;/
      \_     _/
        `"""`
* Connection #0 to host httpbin.example.com left intact

配置一个mutual TLS ingress网关

删除之前的secreting创建一个新的secret，server会使用该CA证书校验client，使用cacert保存CA证书。

$ kubectl -n istio-system delete secret httpbin-credential
$ kubectl create -n istio-system secret generic httpbin-credential --from-file=tls.key=httpbin.example.com.key \
--from-file=tls.crt=httpbin.example.com.crt --from-file=ca.crt=example.com.crt

  1. 将gateway的TLS模式设置为MUTUAL

    $ cat <<EOF | kubectl apply -f -
apiVersion: networking.istio.io/v1alpha3
kind: Gateway
Metadata:
 name: mygateway
spec:
 selector:
   istio: ingressgateway # use istio default ingress gateway
 servers:
 - port:
     number: 443
     name: https
     protocol: HTTPS
   tls:
     mode: MUTUAL #对网关暴露的服务httpbin.example.com启用双向认证
     credentialName: httpbin-credential # must be the same as secret
   hosts:
   - httpbin.example.com
EOF

  2. 使用先前的方式发送HTTPS请求，可以看到访问失败

    $ curl -v -HHost:httpbin.example.com --resolve "httpbin.example.com:$SECURE_INGRESS_PORT:$INGRESS_HOST" \
> --cacert example.com.crt "https://httpbin.example.com:$SECURE_INGRESS_PORT/status/418"
* Added httpbin.example.com:31967:172.20.127.211 to DNS cache
* About to connect() to httpbin.example.com port 31967 (#0)
*   Trying 172.20.127.211...
* Connected to httpbin.example.com (172.20.127.211) port 31967 (#0)
* Initializing NSS with certpath: sql:/etc/pki/nssdb
*   CAfile: example.com.crt
  CApath: none
* NSS: client certificate not found (nickname not specified)
* NSS error -12227 (SSL_ERROR_HANDSHAKE_FAILURE_ALERT)
* SSL peer was unable to negotiate an acceptable set of security parameters.
* Closing connection 0
curl: (35) NSS: client certificate not found (nickname not specified)

  3. 使用公钥example.com.crt生成client的证书和私钥。在curl中传入客户端的证书和私钥，使用--cert传入客户端证书，使用--key传入私钥

    $ openssl req -out client.example.com.csr -newkey rsa:2048 -nodes -keyout client.example.com.key -subj "/CN=client.example.com/O=client organization"
$ openssl x509 -req -days 365 -CA example.com.crt -CAkey example.com.key -set_serial 1 -in client.example.com.csr -out client.example.com.crt

    $ curl -v -HHost:httpbin.example.com --resolve "httpbin.example.com:$SECURE_INGRESS_PORT:$INGRESS_HOST" --cacert example.com.crt --cert ./client.example.com.crt --key ./client.example.com.key "https://httpbin.example.com:$SECURE_INGRESS_PORT/status/418"
...
    -=[ teapot ]=-

       _...._
     .'  _ _ `.
    | ."` ^ `". _,\_;`"---"`|//
      |       ;/
      \_     _/
        `"""`
* Connection #0 to host httpbin.example.com left intact

istio支持几种不同的Secret格式，来支持与多种工具的集成，如cert-manager:

  • 一个TLS Secret使用tls.key和tls.crt；对于mutual TLS，会用到ca.crt
  • 一个generic Secret会用到key和cert；对于mutual TLS，会用到cacert
  • 一个generic Secret会用到key和cert；对于mutual TLS，会用到一个单独的名为 <secret>-cacert的generic Secret，以及一个cacert key。例如httpbin-credential 包含key 和cert，httpbin-credential-cacert 包含cacert

问题定位

  • 检查INGRESS_HOST和SECURE_INGRESS_PORT环境变量

    $ kubectl get svc -n istio-system
$ echo INGRESS_HOST=$INGRESS_HOST,SECURE_INGRESS_PORT=$SECURE_INGRESS_PORT

  • 检查istio-ingressgateway控制器的错误日志

    $ kubectl logs -n istio-system "$(kubectl get pod -l istio=ingressgateway \
-n istio-system -o jsonpath='{.items[0].Metadata.name}')"

  • 校验istio-system命名空间中成功创建了secret。上例中应该存在httpbin-credential和helloworld-credential

    $ kubectl -n istio-system get secrets

  • 校验ingress网关agent将密钥/证书对上传到了ingress网关

    $ kubectl logs -n istio-system "$(kubectl get pod -l istio=ingressgateway \
-n istio-system -o jsonpath='{.items[0].Metadata.name}')"

定位mutul TLS问题

  • 校验CA加载到了 istio-ingressgateway pod中，查看是否存在example.com.crt

    $ kubectl exec -it -n istio-system $(kubectl -n istio-system get pods -l istio=ingressgateway -o jsonpath='{.items[0].Metadata.name}') -- ls -al /etc/istio/ingressgateway-ca-certs

  • 如果创建了istio-ingressgateway-ca-certs secret，但没有加载CA证书，删除ingress网关pod，强制加载该证书

    $ kubectl delete pod -n istio-system -l istio=ingressgateway

  • 校验CA证书的Subject字段是否正确

    $ kubectl exec -i -n istio-system $(kubectl get pod -l istio=ingressgateway -n istio-system -o jsonpath='{.items[0].Metadata.name}')  -- cat /etc/istio/ingressgateway-ca-certs/example.com.crt | openssl x509 -text -noout | grep 'Subject:'
        Subject: O=example Inc.,CN=example.com

    log中可以看到添加了httpbin-credential secret。如果使用mutual TLS，那么也会出现 httpbin-credential-cacert secret。校验log中显示了网关agent从ingress网关接收到了SDS请求，资源的名称为 httpbin-credential，且ingress网关获取到了密钥/证书对。如果使用了mutual TLS，日志应该显示将密钥/证书发送到ingress网关，网关agent接收到了带 httpbin-credential-cacert 资源名称的SDS请求，并回去到了根证书。

卸载

  1. 删除Gateway配置，VirtualService和secret

    $ kubectl delete gateway mygateway
$ kubectl delete virtualservice httpbin
$ kubectl delete --ignore-not-found=true -n istio-system secret httpbin-credential \
helloworld-credential
$ kubectl delete --ignore-not-found=true virtualservice helloworld-v1

  2. 删除证书目录

    $ rm -rf example.com.crt example.com.key httpbin.example.com.crt httpbin.example.com.key httpbin.example.com.csr helloworld-v1.example.com.crt helloworld-v1.example.com.key helloworld-v1.example.com.csr client.example.com.crt client.example.com.csr client.example.com.key ./new_certificates

  3. 停止httpbin和helloworld-v1 服务：

    $ kubectl delete deployment --ignore-not-found=true httpbin helloworld-v1
$ kubectl delete service --ignore-not-found=true httpbin helloworld-v1

不终止TLS的ingress网关

上一节中描述了如何配置HTTPS ingree来访问一个HTTP服务。本节中描述如何配置HTTPS ingRSS来访问HTTPS服务等。通过配置ingress网关来执行SNI方式的访问，而不会在请求进入ingress时终止TLS。

本例中使用一个Nginx服务器作为HTTPS服务。

生成客户端和服务端的证书和密钥

  1. 生成一个根证书和私钥，用于签名服务

    $ openssl req -x509 -sha256 -nodes -days 365 -newkey rsa:2048 -subj '/O=example Inc./CN=example.com' -keyout example.com.key -out example.com.crt

  2. 为 Nginx.example.com创建证书和私钥

    $ openssl req -out Nginx.example.com.csr -newkey rsa:2048 -nodes -keyout Nginx.example.com.key -subj "/CN=Nginx.example.com/O=some organization"
$ openssl x509 -req -days 365 -CA example.com.crt -CAkey example.com.key -set_serial 0 -in Nginx.example.com.csr -out Nginx.example.com.crt

部署Nginx服务

  1. 创建kubernetes Secret保存服务的证书

    $ kubectl create secret tls Nginx-server-certs --key Nginx.example.com.key --cert Nginx.example.com.crt

  2. 为Nginx服务创建配置文件

    $ cat <<EOF > ./Nginx.conf
events {
}

http {
  log_format main '$remote_addr - $remote_user [$time_local]  $status '
  '"$request" $body_bytes_sent "$http_referer" '
  '"$http_user_agent" "$http_x_forwarded_for"';
  access_log /var/log/Nginx/access.log main;
  error_log  /var/log/Nginx/error.log;

  server {
    listen 443 ssl;

    root /usr/share/Nginx/html;
    index index.html;

    server_name Nginx.example.com;
    ssl_certificate /etc/Nginx-server-certs/tls.crt;
    ssl_certificate_key /etc/Nginx-server-certs/tls.key;
  }
}
EOF

  3. 为Nginx服务创建kubernetes configmap

    $ kubectl create configmap Nginx-configmap --from-file=Nginx.conf=./Nginx.conf

  4. 部署Nginx服务

    $ cat <<EOF | istioctl kube-inject -f - | kubectl apply -f -
apiVersion: v1
kind: Service
Metadata:
  name: my-Nginx
  labels:
    run: my-Nginx
spec:
  ports:
  - port: 443
    protocol: TCP
  selector:
    run: my-Nginx
---
apiVersion: apps/v1
kind: Deployment
Metadata:
  name: my-Nginx
spec:
  selector:
    matchLabels:
      run: my-Nginx
  replicas: 1
  template:
    Metadata:
      labels:
        run: my-Nginx
    spec:
      containers:
      - name: my-Nginx
        image: Nginx
        ports:
        - containerPort: 443
        volumeMounts:
        - name: Nginx-config
          mountPath: /etc/Nginx
          readOnly: true
        - name: Nginx-server-certs
          mountPath: /etc/Nginx-server-certs
          readOnly: true
      volumes:
      - name: Nginx-config
        configMap:
          name: Nginx-configmap
      - name: Nginx-server-certs
        secret:
          secretName: Nginx-server-certs #保存了Nginx服务的证书和私钥
EOF

  5. 为了测试Nginx服务部署成功，向服务发送不使用证书的方式请求，并校验打印信息是否正确：

    $ kubectl exec -it $(kubectl get pod  -l run=my-Nginx -o jsonpath={.items..Metadata.name}) -c istio-proxy -- curl -v -k --resolve 
...
* Server certificate:
*  subject: CN=Nginx.example.com; O=some organization
*  start date: May 25 02:09:02 2020 GMT
*  expire date: May 25 02:09:02 2021 GMT
*  issuer: O=example Inc.; CN=example.com
*  SSL certificate verify result: unable to get local issuer certificate (20),continuing anyway.
...

配置一个ingress gateway

  1. 定义一个gateway，端口为443.注意TLS的模式为PASSTHROUGH，表示gateway会放行ingress流量，不终止TLS

    $ kubectl apply -f - <<EOF
apiVersion: networking.istio.io/v1alpha3
kind: Gateway
Metadata:
  name: mygateway
spec:
  selector:
    istio: ingressgateway # use istio default ingress gateway
  servers:
  - port:
      number: 443
      name: https
      protocol: HTTPS
    tls:
      mode: PASSTHROUGH #不终止TLS
    hosts:
    - Nginx.example.com
EOF

  2. 配置经过Gateway的流量路由

    $ kubectl apply -f - <<EOF
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
Metadata:
  name: Nginx
spec:
  hosts:
  - Nginx.example.com
  gateways:
  - mygateway
  tls:
  - match:
    - port: 443 #将gateway的流量导入kubernetes的my-Nginx service
      sniHosts:
      - Nginx.example.com
    route:
    - destination:
        host: my-Nginx
        port:
          number: 443
EOF

  3. 根据指导配置SECURE_INGRESS_PORT和INGRESS_HOST环境变量

  4. 通过ingress访问Nginx，可以看到访问成功

    $ curl -v --resolve Nginx.example.com:$SECURE_INGRESS_PORT:$INGRESS_HOST --cacert example.com.crt https://Nginx.example.com:$SECURE_INGRESS_PORT
...
* SSL connection using TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
* Server certificate:
*       subject: O=some organization,CN=Nginx.example.com
*       start date: May 25 02:09:02 2020 GMT
*       expire date: May 25 02:09:02 2021 GMT
*       common name: Nginx.example.com
*       issuer: CN=example.com,O=example Inc.
...
<title>Welcome to Nginx!</title>
...

卸载

  1. 移除kubernetes资源

    $ kubectl delete secret Nginx-server-certs
$ kubectl delete configmap Nginx-configmap
$ kubectl delete service my-Nginx
$ kubectl delete deployment my-Nginx
$ kubectl delete gateway mygateway
$ kubectl delete virtualservice Nginx

  2. 删除证书和密钥

    $ rm example.com.crt example.com.key Nginx.example.com.crt Nginx.example.com.key Nginx.example.com.csr

  3. 删除生成的配置文件

    $ rm ./Nginx.conf

TIPS

Gateway支持的TLS模式如下：

Name Description
PASSTHROUGH 客户端提供的SNI字符串将用作VirtualService TLS路由中的匹配条件，以根据服务注册表确定目标服务
SIMPLE 使用标准TLS语义的安全连接
MUTUAL 通过提供服务器证书进行身份验证，使用双边TLS来保护与下游的连接
AUTO_PASSTHROUGH 与直通模式相似，不同之处在于具有此TLS模式的服务器不需要关联的VirtualService即可从SNI值映射到注册表中的服务。目标详细信息（例如服务/子集/端口）被编码在SNI值中。代理将转发到SNI值指定的上游（Envoy）群集（一组端点）。
ISTIO_MUTUAL 通过提供用于身份验证的服务器证书，使用相互TLS使用来自下游的安全连接

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