Though I can run ubuntu container in k8s:

 $ k run ubuntu -it --rm --image ubuntu -- bash
 

But this image has very few commands for system admin and development.

So I have to build an image for myself which has the basic commands for DevOps stuff.

Here is my customized content in Dockerfile:

 FROM ubuntu
 RUN apt update && apt -y install \
   make cpanminus git iputils-ping dnsutils wget curl mysql-client libdbd-mysql-perl net-tools
 RUN cpanm MySQL::mycrud
 

Before 'docker build' I have to setup the correct DNS entries for Docker.

Create the file /etc/docker/daemon.json and put the content into it:

 {                                                                          
     "dns": ["8.8.8.8", "8.8.4.4"]                                                                           
 } 
 

And restart docker daemon:

 $ sudo service docker restart
 

Next run docker build:

 $ docker build -t myubuntu myubuntu/
 

Surely Dockerfile should be put under "myubuntu/" dir.

After successful building I could tag it for release ready.

 $ docker tag myubuntu geekml/myubuntu:latest
 

Run 'docker login' to log into docker hub, after then we can publish the image to the official hub.

 $ docker push geekml/myubuntu:latest
 

Now run the image from k8s:

 pyh@kube:~$ k run myubuntu -it --rm --image geekml/myubuntu -- bash
 If you don't see a command prompt, try pressing enter.
     
 root@myubuntu:/# netstat -ntlp
 Active Internet connections (only servers)
 Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name  
 

All are doing well.

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