calico的网络策略测试

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calico的网络策略测试

calico下的网络策略测试

环境说明

[root@liran-test-1.novalocal 19:06 ~]
# calicoctl get node -o wide
NAME                     ASN       IPV4           IPV6   
liran-test-1.novalocal   (63400)   10.0.7.68/24          
liran-test-2.novalocal   (63400)   10.0.7.73/24          
liran-test-3.novalocal   (63400)   10.0.7.78/24

网络策略

参考:https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.15/#networkpolicypeer-v1-networking-k8s-io

配置说明

示例：

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: test-network-policy
  namespace: default
spec:
  podSelector:
    matchLabels:
      role: db
  policyTypes:
  - Ingress
  - Egress
  ingress:
  - from:
    - ipBlock:
        cidr: 172.17.0.0/16
        except:
        - 172.17.1.0/24
    - namespaceSelector:
        matchLabels:
          project: myproject
    - podSelector:
        matchLabels:
          role: frontend
    ports:
    - protocol: TCP
      port: 6379
  egress:
  - to:
    - ipBlock:
        cidr: 10.0.0.0/24
    ports:
    - protocol: TCP
      port: 5978

说明

- apiVserions: api版本
- kind: api类型
- metadata:元数据
- spec:属性定义
- spec.podSelector：pod选择器，定义这个策略作用于那个pod
- spec.policyTypes：策略类型。ingress为入口策略，egress为出口策略
- spec.ingress：定义了入口策略。from下面的ipBlock是ip黑名单，namespaceSelector定义哪些命名空间，podselector定义哪些pod可以访问这个策略定义的pod。ports定义了端口
- spec.egress：to定义了出口策略。ipblock是黑名单。ports定义了端口

上述示例定义的规则:
ingress规则：
- default命令空间下的role=frontend的pod可以访问default下面role=db的pod的6379端口
- myproject命名空间下的所有的pod可以访问default下面的role=db的pod的6379端口
- ip地址：172.17.0.0/16中，除了172.17.1.0/24网段，其他都可以访问default下面的role=db的pod的6379端口
egress规则：
- defalut下面role=db的pod不能访问10.0.0.0/24网段的5978端口

实验

生成nginx的pod配置

[root@liran-test-1.novalocal 19:02 ~/calico-policy-test]
# cat net-policy.yaml 
kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: allow-same-namespace
  namespace: default
spec:
  podSelector:
    matchLabels:
      name: nginx
  policyTypes:
  - Ingress
  - Egress
  ingress:
  - from:
    - podSelector:
        matchLabels:
          app: centos
    ports:
    - port: 80
#kubectl apply -f nginx-deploymetn.yml
[root@liran-test-1.novalocal 19:02 ~/calico-policy-test]
# cat nginx-svc.yaml 
apiVersion: v1 
kind: Service
metadata: 
  name: ca1-nginx-svc 
  labels:
    name: nginx
spec: 
  ports: 
    - port: 80
      targetPort: 80
      protocol: TCP 
  selector: 
    name: nginx
#kubectl apply -f nginx-svc.yml

生成测试用pod

[root@liran-test-1.novalocal 19:03 ~]
# cat test-deployment.yml 
apiVersion: apps/v1
kind: Deployment
metadata:
  name: test-deployment
spec:
  replicas: 2
  selector:
    matchLabels:
        app: centos
  template:
    metadata:
      labels:
        app: centos
    spec:
      containers:
      - name: centos
        image: centos:test-1
        command: ["bash", "-c", "sleep 6000"]

查看网络连通性

[root@liran-test-1.novalocal 18:42 ~/calico-policy-test]
# kubectl  get pod -o wide
NAME                              READY   STATUS    RESTARTS   AGE    IP                NODE                     NOMINATED NODE   READINESS GATES
ca1-nginx-65d7b99f6b-qgfm6        1/1     Running   0          48m    172.200.188.140   liran-test-3.novalocal   <none>           <none>
ca1-nginx-65d7b99f6b-tv69c        1/1     Running   0          48m    172.200.174.135   liran-test-2.novalocal   <none>           <none>
test-deployment-9c498b79c-99r7h   1/1     Running   1          3h6m   172.200.188.139   liran-test-3.novalocal   <none>           <none>
test-deployment-9c498b79c-smf9b   1/1     Running   1          3h6m   172.200.174.134   liran-test-2.novalocal   <none>           <none>

[root@liran-test-1.novalocal 18:42 ~/calico-policy-test]
# kubectl  exec -it test-deployment-9c498b79c-smf9b /bin/bash
[root@test-deployment-9c498b79c-smf9b /]# ping 172.200.188.140
PING 172.200.188.140 (172.200.188.140) 56(84) bytes of data.
64 bytes from 172.200.188.140: icmp_seq=1 ttl=62 time=0.926 ms
^C
--- 172.200.188.140 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.926/0.926/0.926/0.000 ms


[root@test-deployment-9c498b79c-smf9b /]# ping 172.200.174.135  
PING 172.200.174.135 (172.200.174.135) 56(84) bytes of data.
64 bytes from 172.200.174.135: icmp_seq=1 ttl=63 time=0.295 ms
^C
--- 172.200.174.135 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.295/0.295/0.295/0.000 ms
[root@test-deployment-9c498b79c-smf9b /]# ping 172.200.174.134
PING 172.200.174.134 (172.200.174.134) 56(84) bytes of data.
64 bytes from 172.200.174.134: icmp_seq=1 ttl=64 time=0.188 ms
64 bytes from 172.200.174.134: icmp_seq=2 ttl=64 time=0.063 ms
^X64 bytes from 172.200.174.134: icmp_seq=3 ttl=64 time=0.115 ms

生成网络策略。不允许访问nginx的80端口

[root@liran-test-1.novalocal 18:44 ~/calico-policy-test]
# cat net-policy.yaml 
kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: allow-same-namespace
  namespace: default
spec:
  podSelector:
    matchLabels:
      name: nginx
  policyTypes:
  - Ingress
  - Egress
  ingress:
  - from:
    - podSelector:
        matchLabels:
          app: centos
    ports:
    - port: 80
[root@liran-test-1.novalocal 18:44 ~/calico-policy-test]
# kubectl  apply -f net-policy.yaml 
networkpolicy.networking.k8s.io/allow-same-namespace created

测试连通性

[root@liran-test-1.novalocal 18:45 ~/calico-policy-test]
# kubectl  get pod -o wide
NAME                              READY   STATUS    RESTARTS   AGE    IP                NODE                     NOMINATED NODE   READINESS GATES
ca1-nginx-65d7b99f6b-qgfm6        1/1     Running   0          51m    172.200.188.140   liran-test-3.novalocal   <none>           <none>
ca1-nginx-65d7b99f6b-tv69c        1/1     Running   0          51m    172.200.174.135   liran-test-2.novalocal   <none>           <none>
test-deployment-9c498b79c-99r7h   1/1     Running   1          3h9m   172.200.188.139   liran-test-3.novalocal   <none>           <none>
test-deployment-9c498b79c-smf9b   1/1     Running   1          3h9m   172.200.174.134   liran-test-2.novalocal   <none>           <none>

[root@liran-test-1.novalocal 18:45 ~/calico-policy-test]
# kubectl  exec -it test-deployment-9c498b79c-smf9b /bin/bash
[root@test-deployment-9c498b79c-smf9b /]# ping 172.200.188.140
PING 172.200.188.140 (172.200.188.140) 56(84) bytes of data.
^C
--- 172.200.188.140 ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 1000ms

[root@test-deployment-9c498b79c-smf9b /]# ping 172.200.174.135
PING 172.200.174.135 (172.200.174.135) 56(84) bytes of data.
^C
--- 172.200.174.135 ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 1003ms

[root@test-deployment-9c498b79c-smf9b /]# ping 172.200.188.139
PING 172.200.188.139 (172.200.188.139) 56(84) bytes of data.
64 bytes from 172.200.188.139: icmp_seq=1 ttl=62 time=1.01 ms
^C
--- 172.200.188.139 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 1.017/1.017/1.017/0.000 ms

可以看到我们测试的centos的pod已经无法访问到nginx的80端口了。