How to fix "Temporary Failure in name resolution" in WSL

Problem

#

I have encountered a problem when I ping google.com failed and return some error like “Temporary failure in name resolution”

How to fix

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1. Inside WSL2, create or append file: /etc/wsl.conf

2. Put the following lines in the file in order to ensure the your DNS changes do not get blown away

   sudo tee /etc/wsl.conf << EOF
   [network]
   generateResolvConf = false
   EOF
   

3. In a cmd windows (!!), run wsl --shutdown

4. Start WSL2

5. Run the following inside WSL2 (line with search is optional)

sudo rm -rf /etc/resolv.conf
sudo tee /etc/resolv.conf << EOF
search yourbase.domain.local
nameserver 8.8.8.8
nameserver 1.1.1.1
EOF

In my case, I can remove /etc/resolv.conf and error is “rm: cannot remove ‘/etc/resolv.conf’: Operation not permitted”

# use following command instead fixed.
sudo chattr -a -i /etc/resolv.conf

Reference links

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https://askubuntu.com/questions/1192347/temporary-failure-in-name-resolution-on-wsl https://askubuntu.com/questions/125847/un-removable-etc-resolv-conf

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