K8S 之使用Capabilities与限制网络带宽

默认情况下,容器都是以非特权容器的方式运行。比如,不能在容器中创建虚拟网卡、配置虚拟网络。

Kubernetes提供了修改Capabilities的机制,可以按需要给给容器增加或删除。比如下面的配置给容器增加了CAP_NET_ADMIN并删除了CAP_KILL

apiVersion: v1
kind: Pod
metadata:
  name: hello-world
spec:
  containers:
  - name: friendly-container
    image: "alpine:3.4"
    command: ["/bin/echo", "hello", "world"]
    securityContext:
      capabilities:
        add:
        - NET_ADMIN
        drop:
        - KILL

 

限制网络带宽

可以通过给Pod增加kubernetes.io/ingress-bandwidthkubernetes.io/egress-bandwidth这两个annotation来限制Pod的网络带宽

 

apiVersion: v1
kind: Pod
metadata:
  name: qos
  annotations:
    kubernetes.io/ingress-bandwidth: 3M
    kubernetes.io/egress-bandwidth: 4M
spec:
  containers:
  - name: iperf3
    image: networkstatic/iperf3
    command:
    - iperf3
    - -s

  

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