61 lines
1.6 KiB
Markdown
61 lines
1.6 KiB
Markdown
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# 自定义域名解析
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本文介绍在 kubernetes 上如何自定义集群 CoreDNS 的域名解析。
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## 添加全局自定义域名解析
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可以为 coredns 配置 hosts 来实现为 kubernetes 集群添加全局的自定义域名解析:
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编辑 coredns 配置:
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```bash
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kubectl -n kube-system edit configmap coredns
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```
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加入 hosts:
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```txt
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hosts {
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10.10.10.10 harbor.example.com
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10.10.10.11 grafana.example.com
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fallthrough
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}
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```
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> 参考 [CoreDNS hosts 插件说明](https://coredns.io/plugins/hosts/)
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如果是想解析到集群内的 Service，也可以配置下 rewrite:
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```txt
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rewrite name harbor.example.com harbor.harbor.svc.cluster.local
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```
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> 参考 [CoreDNS rewrite 插件说明](https://coredns.io/plugins/rewrite/)
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## 为部分 Pod 添加自定义域名解析
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如果有部分 Pod 对特定的域名解析有依赖，在不希望配置 dns 解析的情况下，可以使用 K8S 提供的 `hostAliases` 来为部分工作负载添加 hosts:
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```yaml
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spec:
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hostAliases:
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- hostnames: [ "harbor.example.com" ]
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ip: "10.10.10.10"
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```
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添加后在容器内可以看到 hosts 被添加到了 `/etc/hosts` 中:
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```bash
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$ cat /etc/hosts
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...
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# Entries added by HostAliases.
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10.10.10.10 harboar.example.com
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```
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