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4.CES 全局策略配置

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Oilbeater edited this page Dec 12, 2021 · 1 revision

Global Egress Policy Use case

该策略场景用于控制整个k8s集群的策略。一般来说，各个集群需要访问一些基本的外部服务，这些策略是整个集群内所有服务需要的。整体策略采用白名单模式，对于需要访问的服务需明确设定。否则将被拒绝。

image-20211124111140911

策略设定方法

  1. 首先创建待访问的目标服务。该服务需位于CES控制运行所在的namespace下。支持IP，域名，协议组合，支持仅IP的任意协议：

    kind: ExternalService
apiVersion: kubeovn.io/v1alpha1
metadata:
   name: globalextsvcdns
   namespace: kube-system
spec:
  addresses:
    - 8.8.8.8
    - 114.114.114.114
  ports:
    - name: tcp-53
      protocol: TCP
      port: "53"
    - name: udp-53
      protocol: UDP
      port: "53"
    apiVersion: kubeovn.io/v1alpha1
kind: ExternalService
metadata:
  name: globalextsvchttp
  namespace: kube-system
spec:
  addresses:
  - www.myf5.net
  - 60.28.100.46
  ports:
  - name: tcp-80
    port: "80"
    protocol: TCP
  - name: tcp-443
    port: "443"
    protocol: TCP
    apiVersion: kubeovn.io/v1alpha1
kind: ExternalService
metadata:
  name: test6extsvc-ip
  namespace: kube-system
spec:
  addresses:
  - 17.171.117.17
  - 18.18.18.18
    # kubectl get externalservices.kubeovn.io -n kube-system
NAME               ADDRESSES
globalextsvcdns    [8.8.8.8 114.114.114.114]
globalextsvchttp   [www.myf5.net 60.28.100.46]
test6extsvc-ip     [17.171.117.17 18.18.18.18]

  2. 创建clusteregressrules资源。该资源无namespace概念。

    # kubectl get clusteregressrules.kubeovn.io -A
NAME                 ACTION              STATUS
global-policy-dns    accept-decisively   Success
global-policy-http   accept-decisively   Success
global-rule6-ip      accept-decisively   Success
    apiVersion: kubeovn.io/v1alpha1
kind: ClusterEgressRule
metadata:
  name: global-policy-dns
spec:
  action: accept-decisively
  externalServices:
  - globalextsvcdns
    apiVersion: kubeovn.io/v1alpha1
kind: ClusterEgressRule
metadata:
  name: global-policy-http
spec:
  action: accept-decisively
  externalServices:
  - globalextsvchttp
    apiVersion: kubeovn.io/v1alpha1
kind: ClusterEgressRule
metadata:
  name: global-rule6-ip
spec:
  action: accept-decisively
  externalServices:
  - test6extsvc-ip
status:
  phase: Success

验证

使用8.8.8.8做DNS解析可以通过

~ # dig @8.8.8.8 www.f5se.io +short
f5se.io.
185.199.109.153
185.199.110.153
185.199.111.153
185.199.108.153

但使用223.5.5.5做解析，无法通过:

~ # dig @223.5.5.5 www.f5se.io +short

; <<>> DiG 9.16.19 <<>> @223.5.5.5 www.f5se.io +short
; (1 server found)
;; global options: +cmd
;; connection timed out; no servers could be reached

访问www.myf5.net可以访问:

~ # curl www.myf5.net
<html>
<head><title>301 Moved Permanently</title></head>
<body bgcolor="white">
<center><h1>301 Moved Permanently</h1></center>
<hr><center>nginx</center>
</body>
</html>~ # curl www.myf5.net
<html>
<head><title>301 Moved Permanently</title></head>
<body bgcolor="white">
<center><h1>301 Moved Permanently</h1></center>
<hr><center>nginx</center>
</body>
</html>

访问www.baidu.com无法访问：

~ # curl www.baidu.com
^C

下一步：

Namespace level策略

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