Linux / UNIX: Create Large 1GB Binary Image File With dd Command

How do I create 1 GB or 10 GB image file instantly with dd command under UNIX / Linux / BSD operating systems using a shell prompt? You can use dd command to create image files for network or file system testing. First, make sure you’ve sufficient disk space to create a image file using dd:   $ df -H …

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CentOS: yum Command Reinstall Package

How do I re-install a package using the yum command under CentOS Linux server? You can use the yum command with the reinstall option. This will reinstall the identical versioned package as currently installed. The syntax is as follows:   yum reinstall packageName yum reinstall packageName1 packageName2 In this example reinstall a package called keepalived, type: # yum reinstall keepalived Sample outputs: Loaded plugins: product-id, rhnplugin, subscription-manager Updating certificate-based …

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Nginx Redirect URL With HTTP/1.1 301 Moved Permanently Header

How do I redirect old ugly urls such as http://example.com/store/view.jsp?product=foo with clean url – http://example.com/store/view/product/foo using nginx reverse proxy? You need to use HttpRewriteModule under nginx web server. This module makes it possible to change URI using regular expressions (PCRE), and to redirect and select configuration depending on variables. The syntax is as follows to chage URI in accordance with …

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Migrate from Mysql to MariaDB in cPanel/WHM

MariaDB is “An enhanced, drop-in replacement for MySQL”. Below you will find some steps on how to affectively stop cPanel/WHM from maintaining MySQL and begin utilizing MariaDB for any and all database activity on your server but please note that, cPanel/WHM no longer maintains MySQL on your system it is on the Systems Administrator to manage and maintain any updates …

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Install EPEL Repo on a CentOS and RHEL 7

How do I install the extra repositories such as Fedora EPEL repo on a Red Hat Enterprise Linux server version 7.x or CentOS Linux server version 7.x? You can easily install various packages by configuring a CentOS 7 or RHEL 7 system to use Fedora EPEL repos and third party packages. Please note that these packages are not officially supported …

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Linux: Finding and locating files with find command part # 2

In the first part we talked about find command basic usage. Now let us see how to use find command (a) To gain lots of useful information about users and their files (b) Monitor and enhance the security of system using find command Finding all set user id files setuid (“suid”) and setgid are access right flags that can be assigned to …

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Install and Configure CSF (Config Server Firewall) on CentOS/Cpanel

CSF : It is the abbreviation of Config Server Security & Firewall. CSF is for configuring or managing your server firewall easily and simply. Here is some useful steps to Install , configure and uninstall csf on server with CentOS. Installation Process: SSH to your server and do the following steps as root user. Step 1: Downloading csf package. rm -fv …

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