k8s-自定义DNS和hosts

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摘要：k8s-自定义DNS和hosts

istio-deployment.yml文件内容：

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apiVersion: apps/v1
kind: Deployment
metadata:
  name: cas
  namespace: cloud
  labels:
    app: cas
spec:
  replicas: 1
  selector:
    matchLabels:
      app: cas
  template:
    metadata:
      labels:
        app: cas
      annotations:
        traffic.sidecar.istio.io/excludeOutboundIPRanges: 0.0.0.0/0
    spec:
      containers:
        - image: harbor.demo.com/cloud/cas:4.1.18
          name: cas
          imagePullPolicy: IfNotPresent # 镜像拉取策略
      dnsConfig:
        nameservers:
          - 10.10.10.10
      hostAliases:
        - ip: "10.20.30.40"
          hostnames:
            - "test123.demo.com"

其中dnsConfig的效果，是往容器的 /etc/resolv.conf 文件中添加记录:

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/ # cat /etc/resolv.conf 
nameserver 10.68.0.2
nameserver 10.10.10.10
search cloud.svc.cluster.local. svc.cluster.local. cluster.local.
options ndots:5
/ #

其中hostAliases的效果，是往容器的 /etc/hosts 文件中添加记录:

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/ # cat /etc/hosts
# Kubernetes-managed hosts file.
127.0.0.1	localhost
::1	localhost ip6-localhost ip6-loopback
fe00::0	ip6-localnet
fe00::0	ip6-mcastprefix
fe00::1	ip6-allnodes
fe00::2	ip6-allrouters
172.20.1.19	cas-7f8687755b-brqfm

# Entries added by HostAliases.
10.20.30.40	test123.demo.com