Linux

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How to fix Call to undefined function apc_fetch() – PHP Fatal Error [Solved]

I have been migrating one of the Joomla website and was stuck with a "PHP fatal error Uncaught Error: Call to undefined function apc_fetch()". If you are stuck with a similar error, then here's how you can solve it. Before that, ...

How to Install MySQL v5.7 using apt-get on Debian 8 Jessie

This tutorial will explain how to install MySQL v5.7 on Debian 8 Jessie server. The default repositories in Debian 8 will install MySQL version up to 5.6, so if you ever want to install 5.7, then you need to setup a ...

Apache Error: Symbolic link not allowed or link target not accessible

In continuation to my tutorial on Installation of Datawrapper and possible errors with solutions, here's another error in Apache - "Symbolic link not allowed or link target not accessible". Below is the complete error message from Apache error_log. AH00037: Symbolic link not ...

Not safe to rely on system’s timezone settings -PHP Warning

Here's another error related to Datawrapper installation - "PHP warning:  It is not safe to rely on system's timezone settings". Below is the complete error message from Apache error_log file. PHP Warning:  phpinfo(): It is not safe to rely ...

M2Crypto SSL Check Error: Peer certificate subjectAltName does not match [Solved]

Question: I'm stuck with M2crypto SSL check error while installing Webmin package on RHEL 5.5. Here's the complete error message: # yum install webmin File "/usr/lib64/python2.4/site-packages/M2Crypto/SSL/Checker.py", line 88, in__call__ fieldName='subjectAltName') M2Crypto.SSL.Checker.WrongHost: Peer certificate subjectAltName does not match host, expected netix.dl.sourceforge.net, got DNS:mirrors.netix.net How to solve this ...

Fix Apache Error: Client Denied by Server Configuration

I recently wrote a tutorial on Installation of DataWrapper and its possible errors with solutions. Here, I'm writing about another error with a solution for the benefit of the Datawrapper community. These errors are mostly non Datawrapper based i.e, it ...

Using Sed,ex & perl commands to find and replace a text in Linux

Question: I would like to replace a text with a link in anchor tag of a html file. The challenge is that, the project contains hundreds of such HTML files and replacing a text in all those files manually is not ...

Disable open_basedir in cPanel for error open_basedir restriction in effect

This tutorial explains how to adjust open_basedir attribute in PHP configuration and in case of shared hosting, learn to disable open_basedir via cPanel. Question: Recently I worked for a client to install Datawrapper application on his Debian Jessie shared hosting server. I ...

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 ...

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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 ...

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 ...

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