Network is unreachable when using domain

[juancresc]

Hi!

I was setting up a new instance and getting a lot of these:

E20221212 16:34:30.149008 8902 replication.cc:251] [replication] Failed to connect the master, err: Network is unreachable

The weird thing is that I was able to connect to the master using the same port and domain using the redis-cli, so it was reachable. The issue was solved when I replaced the domain name by the host IP. I wonder why kvrocks is it not able to connect but the redis-cli is

[juancresc]

adding a though here, is the a domain cache at the app level or something?

[git-hulk]

You can use nslookup {YOUR DOMAIN} to have a look at if it's an ipv6 address.

[juancresc]

seems to be ipv4

Server:         10.1.0.2
Address:        10.1.0.2#53

Non-authoritative answer:
Name:   kvrocks-master.mydomain.com.internal
Address: 10.1.0.34

[juancresc]

interestingly I was hitting into this issue again. The solution was to move out of unstable to 2.2 and it's gone
@git-hulk

[git-hulk]

Thanks for @juancrescente feedback, I will investigate it soon.

[git-hulk]

@juancrescente Wanna confirm if your Kvrocks contains this commit: #1172? if yes, it's caused by SockConnect with timeout implementation that doesn't support resolving domain yet. cc @caipengbo