Bootstrapping CentOS rootfs for use with chroots/containers

We will see how to generate a rootfs tarball for redhat based system. Since we are targetting redhat based system, I am going to use debian based system (Ubuntu 17.10 64-bit - latest at the time of writing this post) as my host. We will generate rootfs tarball for CentOS 7 64-bit.å The below mentioned steps are validated on Ubuntu 17.10 desktop installation. Lets get started As usual the first step, install the required dependecy packages which in our case is yum. [Read More]

Bootstrapping a debian rootfs for use with chroots/containers

The aim this time is to setup a base rootfs for Ubuntu/Debian distro which can be used for setting up a chroot jail or to create a docker container base image. This blog is based on a earlier blog which I have written but forgot to publish around June, 2012. The below mentioned steps are validated on Fedora 25 Workstation installation. For setting up a debian based rootfs we need a tool called debootstrap. [Read More]

Forwarding DNS server on Ubuntu 16.04

Goal We are looking to setup up a minimal forwarding DNS server on Ubuntu 16.04. After that we will see how to use nsupdate and dig to verify our configuration. Prerequisites A VM running Ubuntu 16.04 with BIND installed You need root access for the VM External DNS server information We are going to use google’s DNS servers (8.8.8.8 and 8.8.4.4) as our external servers. In case a query can’t be resolved by our DNS server it will forward the request to the external server. [Read More]