解决办法
找到 /etc/resolv.conf,可以看到如下内容
# This file was automatically generated by WSL. To stop automatic generation of this file, add the following entry to /etc/wsl.conf:
# [network]
# generateResolvConf = false
nameserver 172.23.199.1
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注意看上面那句话，意思是，这个文件是wsl自动生成的，如果要停止生成这个文件，需要将下面的配置添加到 /etc/wsl.conf下面；我还是太年轻了，当我按照上面说的那样照做之后，并且将nameserver 改为 8.8.8.8，TMD重启之后，nameserver 还是172.23.199.1，已经快崩溃了。可以看下当时我wsl.conf 和 resolv.conf 的配置:
# wsl.conf
[network]
generateResolvConf = false
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# resolv.conf
nameserver 8.8.8.8
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终极解决办法
sudo rm /etc/resolv.conf
sudo bash -c 'echo "nameserver 8.8.8.8" > /etc/resolv.conf'
sudo bash -c 'echo "[network]" > /etc/wsl.conf'
sudo bash -c 'echo "generateResolvConf = false" >> /etc/wsl.conf'