Linux

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Nginx Error: [::1]:80 failed: Address family not supported by protocol [Solved]

Question:  I have installed Nginx on a Ubuntu Xenial machine through apt-get.  However the service failed to start with an error message as "Address family not supported by protocol". Below is the complete nginx error message: -- Unit nginx.service has begun ...

How to install PHP 7.1 on GNU/Linux Debian 8.7 (jessie) server?

This tutorial will explain how to install PHP and its dependent packages on GNU Linux. If the Linux is installed with minimal packages,  then you need to install packages such as add-apt-repository, apt-transport-https, ca-certificates etc., as these packages will be used ...

OpenStack Fake Driver for Cloud Simulations [Tutorial]

OpenStack is a popular cloud operating system that allows you to control large amount of compute, storage and networking resources. It supports all popular Hypervisors such as KVM, Xen, VMware, HyperV etc...and this integration is made using compute drivers ...

OpenStack Compute Error – No compute node record for host [Solved]

OpenStack compute Error: Though the compute hosts had nova-compute service listening, those nodes were not displayed when 'nova hypervisor-list' command was executed. # nova hypervisor-list +----+----------------------------+-------+---------+ | ID | Hypervisor hostname | State | Status | +----+----------------------------+-------+---------+ But the command nova service-list didn't have any problem ...

Error in Sudoers file? Here’s how you can fix it.

It's quite common for an administrator to edit sudoers file and allow users to execute administrative commands. But what if you make an error? The sudo command is going to fail isn't? That's what exactly I did while installing ...

OpenStack VM Launch Error – Last exception: Binding failed for port [Solved]

Error:  "Exceeded maximum number of retries. Exceeded max scheduling attempts 3 for instance <instance_id>. Last exception: Binding failed for port. ucode: 500" while launching a VM in OpenStack Mitaka. If you are stuck with a similar issue, here's how you can solve ...

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 ...

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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 ...

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 ...

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