Linux

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MySQL Table Crash fix – marked as crashed and should be repaired?

One of the table in my MySQL database has been corrupted and the worst part of it is, the corrupted one was the sessions table - due to which the application was not able to store sessions for the users. Well, I ...

How to Configure virt-manager for Nested Virtualization Support?

Question: I have installed KVM hypervisor on my Debian Guest OS (basically a nested virtualization) which is hosted on a Ubuntu machine. However, when I run the kvm command, I get this error  - "Could not access KVM kernel module: No ...

How to Fix Error – qemu: could not load PC BIOS ‘bios.bin’?

Question: I have configured qemu-kvm on Ubuntu machine and got a qemu error - 'could not load PC BIOS bios.bin' while executing qemu-system-x86_64 command.  How to solve this error? Solution: QEMU-KVM will need a BIOS such as Seabios, vgabios, boschs etc... to start ...

Issue: IP address in Ubuntu gets cleared automatically after sometime [Solution]

Question: I have set an ip address for eth0 interface in Ubuntu and it worked for a while. But after sometime, the IP address is automatically removed from the eth0 interface in-spite of having the entry for eth0 in /etc/network/interfaces file. How ...

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 a button. To do that, you need to login to the Horizon interface and click NETWORK > Networks and ...

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. Here's another one on this topic. On excitement, I created an Instance with a flavor of m1.small and started ...

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 server. Please tell me how to solve this error: # ./configure warning: proceeding without pkg-config Error: libpci header check failed Disable KVM Device Assignment ...

How to Fix apt-get Failed to Fetch error in unsupported Ubuntu releases

For one of my project, I need to install an older version of Ubuntu (11.10 oneiric release). But apt-get failed (install) or apt-get update was no longer working and failed with an error message  "Failed to fetch" and "404 not ...

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 on Ubuntu machine. Below is the complete error message. $ ./configure Error: libpci header check failed Disable KVM Device Assignment capability. How ...

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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 can do that. Well, there can be a multiple versions of package in the yum repository and if not instructed, ...

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 tutorial, I'll show how to create a Kali Linux image in qcow2 format for OpenStack Mitaka. Kali Linux is one ...

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 and Fedora based machines. 7z files are generally smaller in size (as it creates a file with a very high ...

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 server on CentOS machine. The error indicates that the service failed due to unregistered authentication agent for unix process and it ...

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 Metasploit framework. The issue here is, I did tried installing bundler gem using 'gem install bundler', but still msfconsole script produces ...

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 executing make command. EC_GROUP_new_curve_GF2m undeclared (first use in this function) The error occurred while compiling ossl_pkey_ec.c file. Here's the snapshot of the complete ...

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 tried to mount it manually, but failed to mount via /etc/fstab for automount. The error message indicated that the file ...

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 already have Puppet master/agent nodes installed and ready for use. In order to use Puppet, you need to understand how ...

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 repetitive and error-prone system administration tasks - which includes provisioning, installation of packages/software, configurations and management of the entire infrastructure. ...

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