Host Reachable Through cURL but Cannot Be Resolved by nslookup
Recently I was doing some weird shit with docker and docker compose that required a weird DNS setup. While debugging a problem with DNS resolution in nginx I came across a strange issue: I could reach a host by curl and ping but wasn't able to resolve it using nslookup and dig.
A quick Google search wasn't really helpful so I decided to run
strace on both
tools and see if there's an obvious difference in how they handle name resolution.
After looking at the trace I finally spotted the difference: curl was opening
/etc/hosts and dig wasn't!
Turns out extra_hosts
is adding hostnames to the
/etc/hosts file which isn't checked by the DNS tools or
This website is open source. If you've come across a mistake please provide feedback there.