Welcome to the Linux Foundation Forum!

network does not works on a bash shell inside the new pod

kakhavk
kakhavk Posts: 5
in LFS258 Class Forum

Hello
I am learning kubernetes on LFS258 course and there is example when need to run apt-get update from shell inside te new pod
student@lfs458-node-1a0a:~$ kubectl exec -it thirdpage-5cf8d67664-zcmfh -- /bin/bash
root@thirdpage-5cf8d67664-zcmfh:/# apt-get update

but when runnig command apt-get update it cannot conect to server

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

Answers

  • kakhavk
    kakhavk Posts: 5

    Thank for answer!
    Yes I have nstalled ubuntu 16 on virtualbox
    firewall is disabled
    network is in bridge mode so ip addres is in same type as physicalcomputer
    when I am runnig ping it seems that there is not ping installed in pod's environment

    hi@lfs258-node-1a0a:~$ kubectl exec -it thirdpage-7c9b56bfdd-4pmhr -- /bin/bash

    root@thirdpage-7c9b56bfdd-4pmhr:/# ping
    bash: ping: command not found

  • kakhavk
    kakhavk Posts: 5

    cat command works and gets:

    root@thirdpage-7c9b56bfdd-4pmhr:/# cat /etc/resolv.conf
    nameserver 10.96.0.10
    search default.svc.cluster.local svc.cluster.local cluster.local
    options ndots:5

  • kakhavk
    kakhavk Posts: 5
    edited November 2018

    Oh yes I fixed it
    Thanks for helping, I added with command "echo nameserver 8.8.8.8 > /etc/resolv.conf"

  • anjireddy1991
    anjireddy1991 Posts: 2

    root@master:~# kubectl exec nginx -it -- /bin/bash
    root@nginx:/# cat /etc/resolv.conf
    search default.svc.cluster.local svc.cluster.local cluster.local
    nameserver 10.96.0.10
    options ndots:5
    root@nginx:/# ping 4.2.2.2
    bash: ping: command not found
    root@nginx:/# "echo nameserver 8.8.8.8 > /etc/resolv.conf"
    bash: echo nameserver 8.8.8.8 > /etc/resolv.conf: No such file or directory
    root@nginx:/# echo nameserver 8.8.8.8 > /etc/resolv.conf
    root@nginx:/# apt update -y
    Err:1 http://deb.debian.org/debian bullseye InRelease
    Temporary failure resolving 'deb.debian.org'
    0% [Connecting to deb.debian.org]

  • anjireddy1991
    anjireddy1991 Posts: 2

    root@master:~# kubectl get pod -o wide
    NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
    nginx 1/1 Running 1 (87m ago) 96m 10.44.0.1 worker
    root@master:~# kubectl get node -o wide
    NAME STATUS ROLES AGE VERSION INTERNAL-IP EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME
    master Ready control-plane 26h v1.26.1 192.168.122.31 Ubuntu 20.04.5 LTS 5.15.0-58-generic containerd://1.6.15
    worker Ready 25h v1.26.1 192.168.122.226 Ubuntu 20.04.5 LTS 5.15.0-58-generic containerd://1.6.15
    root@master:~#

    root@master:~# kubectl exec nginx -it -- /bin/bash
    root@nginx:/# cat /etc/resolv.conf
    search default.svc.cluster.local svc.cluster.local cluster.local
    nameserver 10.96.0.10
    options ndots:5
    root@nginx:/# ping 4.2.2.2
    bash: ping: command not found
    root@nginx:/# "echo nameserver 8.8.8.8 > /etc/resolv.conf"
    bash: echo nameserver 8.8.8.8 > /etc/resolv.conf: No such file or directory
    root@nginx:/# echo nameserver 8.8.8.8 > /etc/resolv.conf
    root@nginx:/# apt update -y
    Err:1 http://deb.debian.org/debian bullseye InRelease
    Temporary failure resolving 'deb.debian.org'
    Err:2 http://deb.debian.org/debian-security bullseye-security InRelease
    Temporary failure resolving 'deb.debian.org'
    Err:3 http://deb.debian.org/debian bullseye-updates InRelease
    Temporary failure resolving 'deb.debian.org'
    Reading package lists... Done
    Building dependency tree... Done
    Reading state information... Done
    All packages are up to date.
    W: Failed to fetch http://deb.debian.org/debian/dists/bullseye/InRelease Temporary failure resolving 'deb.debian.org'
    W: Failed to fetch http://deb.debian.org/debian-security/dists/bullseye-security/InRelease Temporary failure resolving 'deb.debian.org'
    W: Failed to fetch http://deb.debian.org/debian/dists/bullseye-updates/InRelease Temporary failure resolving 'deb.debian.org'
    W: Some index files failed to download. They have been ignored, or old ones used instead.
    root@nginx:/#

  • fazlur.khan
    fazlur.khan Posts: 73

    If you have VPN running, stop it and try again. It worked for me ...

Categories

Upcoming Training