kubernetes 실행 중인 pod에 접속해 package 설치

kubectl exec [pod-name] -it -- bash 혹은 kubectl exec [pod-name] -it -- sh 커맨드로 실행 중인 pod에

접속할 수 있다.

 

실행 중인 pod에 접속한다.

[root@kw1 ~]# kubectl exec ksimage-app -it -- bash
root@ksimage-app:/app# ls -al
total 12
drwxr-xr-x. 1 root root  20 Mar 29 08:51 .
drwxr-xr-x. 1 root root  84 Mar 29 08:59 ..
-rw-r--r--. 1 root root 268 Mar 29 06:17 Dockerfile
-rw-r--r--. 1 root root 204 Mar 29 08:50 ksFlask.py
-rw-r--r--. 1 root root 174 Mar 29 06:17 requirements.txt
drwxr-xr-x. 1 root root  21 Mar 30 13:34 static
drwxr-xr-x. 2 root root  24 Mar 29 06:17 templates

 

패키지를 설치한다. `E: Unable to locate package vim` 에러가 발생한다. 인터넷을 찾아보니 apt-get을 update 하라고 함

root@ksimage-app:/app# apt-get install vim
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
E: Unable to locate package vim

 

apt-get update를 하니 resolve error가 발생함

root@ksimage-app:/app# apt-get update
Err:1 http://deb.debian.org/debian bullseye InRelease
  Temporary failure resolving 'deb.debian.org'
Err:2 http://security.debian.org/debian-security bullseye-security InRelease
  Temporary failure resolving 'security.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://security.debian.org/debian-security/dists/bullseye-security/InRelease  Temporary failure resolving 'security.
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.

 

/etc/resolv.conf를 확인해봄

nameserver가 이상하게 세팅되어있음

root@ksimage-app:/app# cat /etc/resolv.conf
nameserver 10.96.0.10
search default.svc.cluster.local svc.cluster.local cluster.local dd.io
options ndots:5

 

vi가 없으니 echo로 /etc/resolv.conf를 수정한다.

root@ksimage-app:/app# echo nameserver 8.8.8.8 > /etc/resolv.conf
root@ksimage-app:/app# cat /etc/resolv.conf
nameserver 8.8.8.8

 

다시 apt-get update를 수행하니 정상적으로 수행된다.

root@ksimage-app:/app# apt-get update
Get:1 http://security.debian.org/debian-security bullseye-security InRelease [44                                                       .1 kB]
Get:2 http://deb.debian.org/debian bullseye InRelease [116 kB]
Get:3 http://deb.debian.org/debian bullseye-updates InRelease [39.4 kB]
Get:4 http://security.debian.org/debian-security bullseye-security/main amd64 Pa                                                       ckages [123 kB]
Get:5 http://deb.debian.org/debian bullseye/main amd64 Packages [8182 kB]
Get:6 http://deb.debian.org/debian bullseye-updates/main amd64 Packages [2596 B]
Fetched 8507 kB in 2s (4071 kB/s)
Reading package lists... Done

 

vim도 잘 설치된다.

root@ksimage-app:/app# apt-get install vim