"ssh: Could not resolve hostname github.com: Try again" - Inside docker container

Question

I meet a strange problem like this. I need to start an container and clone github project via ssh in side container i just created. Sometime git clone perfect, and there is no trouble. But some time it can't and say this:

ssh: Could not resolve hostname github.com: Try again
fatal: Could not read from remote repository.

I tried a lot of ways, like change mys /etc/resolv.conf by add google DNS, echo google DNS to /etc/resolv.conf inside container, restart docker, reinstall docker but no luck..
My git clone container join in to a docker user define bridge network. I think network is one of my problem but i don't know what exactly happen.
Another notice, everything work fine if i run it in local - ubuntu os. Problem only happen on my Linode serve
There is anyone meet this problem ? Please help me...

For someone who searching for this issue. I used the CentOS server. Just witch to use Ubuntu, then the problem is gone. — Truong Dang
– Truong Dang, Commented Aug 26, 2020 at 15:19

VonC · Accepted Answer · 2018-07-09 04:58:01Z

1

If you are using a lish shell session, try, as suggested here:

ssh -Tvvv [email protected]

And do a traceroute to see where the resolution fails.

answered Jul 9, 2018 at 4:58

VonC

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6 Comments

Truong Dang Over a year ago

Thank for your response, i have tried debug conenct this way anf it hanging at the time connect to github... Coun't get any response or error wanning...

VonC Over a year ago

@TruongDang Do you have any ~/.ssh/config file?

Truong Dang Over a year ago

Yes.. Here is what i did for my docker iamge. It work well in local machine

echo -e "Host *\n\tStrictHostKeyChecking no\n\tIdentityFile /root/.ssh/id_rsa\n\tAddKeysToAgent yes\n" > /root/.ssh/config

VonC Over a year ago

@TruongDang Is your private SSH key passphrase protected?

VonC Over a year ago

@TruongDang OK so AddKeysToAgent might not be needed on Linode side. Does a ping github.com works (from Linode)?

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