Multi tool use

Err:1 http://security.debian.org/debian-security stretch/updates InRelease

I'm Working on single master 2 node kubeadm cluster.

kubeadm

When I exec to a pod & try to do apt-get update, I receive the following error.

osboxes@Master-1:~$ kubectl exec -it 1stpod -- /bin/bash
root@1stpod:/# ls
bin boot dev etc home lib lib64 media mnt opt proc root run sbin srv sys tmp usr var
root@1stpod:/# vi /etc/resolv.conf
bash: vi: command not found
root@1stpod:/#
root@2ndpod:/# apt-get update
Err:1 http://security.debian.org/debian-security stretch/updates InRelease
Temporary failure resolving 'security.debian.org'
Err:2 http://deb.debian.org/debian stretch InRelease
Temporary failure resolving 'deb.debian.org'
Err:3 http://deb.debian.org/debian stretch-updates InRelease
Temporary failure resolving 'deb.debian.org'
Reading package lists... Done
W: Failed to fetch http://deb.debian.org/debian/dists/stretch/InRelease Temporary failure resolving 'deb.debian.org'
W: Failed to fetch http://security.debian.org/debian-security/dists/stretch/updates/InRelease Temporary failure resolving 'security.debian.org'
W: Failed to fetch http://deb.debian.org/debian/dists/stretch-updates/InRelease Temporary failure resolving 'deb.debian.org'
W: Some index files failed to download. They have been ignored, or old ones used instead.


Please suggest how to fix it.

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