K8S 设置 Pod 使用 host 网络、配置 DNS

如果希望 Pod 可以使用宿主机的网络，可以添加 hostNetwork: true

apiVersion: apps/v1
kind: Deployment
metadata:
  name: spark-app
  labels:
    app: spark-app
spec:
  selector:
    matchLabels:
      app: spark-app
  replicas: 1
  template:
    metadata:
      labels:
        app: spark-app
    spec:
      hostNetwork: true
      containers:
        - name: spark-app
          image: spark-app-image

但这样起来后似乎就用不了 K8S 配置的 Service 的域名


K8S 使用的 DNS 是 Core DNS，可以在这里添加新的域名、IP

lin@lin-virtual-box:~$ kubectl get cm -n kube-system
NAME                                 DATA   AGE
coredns                              2      33d
extension-apiserver-authentication   6      33d
kube-proxy                           2      33d
kubeadm-config                       2      33d
kubelet-config-1.16                  1      33d

kubectl edit cm coredns -n kube-system

apiVersion: v1
data:
  Corefile: |
    .:53 {
        errors
        health
        ready
        kubernetes cluster.local in-addr.arpa ip6.arpa {
           pods insecure
           fallthrough in-addr.arpa ip6.arpa
           ttl 30
        }
        hosts {
           202.35.32.100 host-name
           fallthrough
        }
        prometheus :9153
        forward . /etc/resolv.conf
        cache 30
        reload
        loadbalance
    }