A Passionate Techie

1. Change to root User Bash su - ## OR ## sudo -i 2. Install Fedora or RHEL Repo Files Bash cd /etc/yum.repos.d/ ## Fedora 26/25/24/23/22/21/20/19/18/17/16 users wget http://download.virtualbox.org/virtualbox/rpm/fedora/virtualbox.repo ## CentOS 7.4/6.9 and Red Hat (RHEL) 7.4/6.9 users wget http://download.virtualbox.org/virtualbox/rpm/rhel/virtualbox.repo 3. Update latest packages and check your kernel version Update packages Bash ## Fedora 26/25/24/23/22 ## dnf update ## Fedora 21/20/19/18/17/16 and CentOS/RHEL 7/6/5 ## yum update While executing yum update if you get any dependency errorfor glibc use the following to resolve it: rpm -qa | grep glibc You may see duplicates for either glibc or glibc common. There might be a common version in between any two packages of glibc and glibc-common. Remove the package which has uncommon version. You can also check for duplicates with the following command: yum list --showduplicates glibc rpm -e glibc-common-2.17-196.el7 rpm -qa kernel |...

currently with docker you are limited to only linux machines and apps. It is like installing various zip files on your os. because of the use of base image we can save space.All the containers use the same base image. If you want 100 containers in traditional vm env you would have needed 100GB space considering 1gb per image but with docker you will need only 1gb of space. Suppose if you need emacs and apache then docker will add to separate images for it on top of each other and with the base image it will form a union image. this image is readonly so to write in it docker will place a writable container and the whole set container:image(apache)+image(emacs)+base image will make a whole container in the docker.  But the writable container is not persistent. Docker boots the image/ image layers on top f each other. apt-cache search docker.io ---will display a list of packages containing docker apt-chache show docker.io ---- will display all details of packaage Check if it is latest ver...