chore: change defaultNS of SystemDns and add log for reading system dns error #749
+31
−14
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Background
在 dae 的使用场景,获取不到 SystemDns 时,最好不好使用 127.0.0.1:53,而是使用一个 public dns,这样能最大程度确保可用性。
另外,本次 PR 将在获取失败 system dns 时打印 error。
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