How to Fix OpenStack Error – Failed to delete network? [Solved]
OpenStack Horizon allows you to configure network, subnets, routers etc…It also allows users to delete network with a click of...
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How to resize an Instance in OpenStack Mitaka?
You would have read our earlier posts on Openstack installation and its various configuration setup’s and solutions to installation errors....How to Fix libpci header check failed. Disable KVM Device Assignment capability?
Question: I got an error “libpci header check failed. Disable KVM Device Assignment capability” while compiling qemu-kvm package on Ubuntu...Fix Error: libpci check failed. Disable KVM Device Assignment capability [Solved]
Question: I was stuck with an error “Error: libpci check failed. Disable KVM Device Assignment capability” while compiling qemu-kvm package...How to use yum to install a specific version of a Package?
If you ever want to instruct YUM to install only a particular version of a package, then here’s how you...How to Create Kali Linux Image in QCOW2 format for OpenStack?
If you ever wanted to try Kali Linux in OpenStack, then you have landed on the right page. In this...How to Extract 7z package in CentOS/RHEL/Fedora?
Are you stuck in extracting .7z file in Linux? Then here’s how you can install 7z extractor in CentOS, RHEL...Failed to start PostgreSQL database server – Unregistered Authentication Agent for unix-process [Solved]
Question: I got an error ‘Failed to start PostgreSQL database server – Unregistered Authentication Agent for unix-process‘ while starting PostgreSQL...How to Fix Metasploit error – requires the bundler gem to be installed? [Solved]
Question: I was stuck with an error “Metasploit requires the bundler gem to be installed” while executing msfconsole from the...How to Fix Ruby Installation error: EC_GROUP_new_curve_GF2m undeclared (first use in this function)?
Question: I was compiling Ruby version 1.9.3 on a CentOS machine and landed up with the below error message while...How to find the filesystem of CD/DVD to make it mount automatically : [Linux]
Question: I recently burnt a DVD and was trying to mount it on my Ubuntu box. It worked, when I...Understanding Puppet Resources, Manifests, Modules and Classes with Examples
In this tutorial, I’ll be explaining about Puppet resources, manifests, modules and classes with examples. Also, I assume that you...How to Install and Configure Puppet 4 on CentOS and Ubuntu? [Master and Agent]
Puppet, a popularly known configuration management tool for Unix and Windows based systems that allows an administrator to easily automate...How to use Auditing System in Linux – Configure, Audit Logs and Generate Reports
Before we start discussing about the Auditing system, I would like to ask few questions. How do you monitor the commands...Here’s everything you can do with Nmap – Command Examples
Nmap is an open source network mapper that allows one to scan network of hosts, services, perform security assessment and...How to Fix – Sudo unable to resolve host in Ubuntu?
If you getting an error “Sudo unable to resolve host” while executing sudo command in Ubuntu, then here’s how you can...How to start a VM on a Specified Host/Compute Node in OpenStack Mitaka?
With the appropriate permissions, the user can launch VM on a specified host/compute node in OpenStack Mitaka. All you need to...[Openstack]: Set user password when launching cloud images
I recently installed OpenStack Mitaka on my test bed and imported few images from CentOS & Ubuntu repositories. Once the VM...Setup command in CentOS 7 throws Error – FirewallD is active, please use firewall-cmd!
I generally use setup or system-config-firewall commands to configure firewall in CentOS machines. But the same commands in CentOS 7...[Ubuntu]: sudoers NOPASSWD option not working
Question: I wanted to install a package as a local user and use sudo wherever required. To do that, I created...