How to Delete all files older than X number of Days in Linux?
Question: I would like to know if there is a single command in Linux that allows me to delete all...
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How to Remove All Commented Lines or Lines with a Specific Pattern in vim?
Recently I was doing lot of text editing on one of my server (for maintenance activity) – where I need...Why increasing ‘max_connections’ in MySQL is just not enough to fix “Too many connections” Error
For the past few days, I started to see this error “Too many connections” in the error log. Generally, the...How to Hide or Remove Unwanted Apache Headers to Protect your WordPress Site?
It all starts from here – whenever the client requests for a page, the server sends out response data (the...PHP Warning: require_once(): Unable to allocate memory for pool [Resolved]
Question: For the past two weeks, I started seeing Apache logging PHP warnings as “Unable to allocate memory for pool“....How to Upgrade Sendmail to the latest version on CentOS
Recently I had to upgrade Sendmail version 8.13 to the latest version 8.15 on CentOS 5. If you are someone planning...How to List all Modules Loaded or Enabled in Apache httpd?
Question : Recently, I was learning how to secure Apache web server guide – in which one of the suggestion was to...Troubleshooting Request Tracker version 3 Error – Attempt to free unreferenced scalar, Perl interpreter
I have been using Request Tracker version 3 for quite sometime and it worked great. But suddenly the RT server...Error : Permission denied: .htaccess pcfg_openfile: unable to check htaccess file, ensure it is readable [Solved]
If you are getting this error “Permission denied: /var/www/html/.htaccess pcfg_openfile: unable to check htaccess file, ensure it is readable“. Then...PHP Warning: Module ‘modulename’ already loaded in Unknown on line 0 fileinfo [Solved]
If your PHP program throws this warning “Module <some_module_name> already loaded”, then here’s how you can fix that. Normally this...RT:Request Tracker – Error : rt-mailgate – Undefined server error – 500 Can’t connect or verify Certificate [Solved]
I have installed Request Tracker (RT) in my office and it was working well until today. Suddenly, it stopped accepting ticket requests via Mail and there was...How to Create, Extract or Open RAR file in Linux?
Everyone might have used RAR files in Windows, but using it on Linux is not straightforward. None of the Linux operating...Error: xenstore-read: xs_open: No such file or directory on DomU [Solved]
Question: Hi, I have installed Xen Hypervisor version 3.1 on RHEL machine, which runs two CentOS VMs on Dom0. I would...Error : Xend Start – /proc/xen/capabilities: No such file or directory [Solved]
Question: I was able to install Xen Hypervisor successfully on Red Hat Enterprise Linux release 5.5 and booted the system...Error: Cannot retrieve metalink for repository: epel. Please verify its path and try again [Solved]
Question: I was trying to install Xen server on CentOS 6.4 via yum install xen, but yum failed with an error...How to use Wget to recursively download files from a web directory?
Question: My company’s intranet website hosts GB’s of software tools and applications. I have been trying to download all of...How to Install Xen Virtualization Software on Linux and Launch a VM using virt-manager?
Question: I have a Red Hat Enterprise Linux version 5.5 operating system running on an Intel Xeon machine that supports...Error: Setup Command not found in CentOS VPS [Solved]
Hi, I was using setup command in one of my RHEL machine to configure firewall, network and system services. Recently, I...How to Login to OpenStack Instance or VM via PuTTY using Key?
Question: I installed OpenStack Icehouse on my test bed and was able to create instances successfully. But I was not...CentOS – semanage command not found error – The fix is here!
Question: I was trying to setup Apache web server on a different port other than port 80. For instance, on...