How To Monitor Remote Linux Host using Nagios

In the previous post How to install Nagios on CentOS 5 or 6 , I explained the overview, installation and configuration of Nagios 3.0 on a CentOS Server. In the following three chapters, I’ll explain how to monitor a remote Linux host and the various services running on the remote host.  Also, please refer to all our Nagios articles. I. Overview II. 6 …

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Open SSL Heartbleed vulnerability – A complete check and fix

In this time, we all are aware about the new Open SSL Heartbleed vulnerability. The Heartbleed bug allows anyone on the Internet to read the memory of the systems protected by the vulnerable versions of the OpenSSL software. You will get more details from this link Heartbleed. The open SSL version 1.0.1 version has vulnerabilities except 1.0.1g and other versions. Different communities …

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Rsync: Preserve / Copy Hard Links ( Backup Rsnapshot Directory Tree )

I’m using rsnapshot filesystem snapshot utility to make incremental snapshots of local and remote filesystems for 10 production servers running on RHEL 5.x system. The rsnapshot commands makes extensive use of hard links, so if the file doesn’t change, the next snapshot is simply a hard link to the exact same file. How do I use the rsync command to copy my the entire snapshot …

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Bash Scripting Basics: Part 1

If you have been using computers for a while, whether you have been using Unix, Windows or Mac operating systems, you’re probably already familiar with the term shell. A shell is piece of software that is inbuilt into most operating systems which acts as an interface to the kernel and other software. Shells come in various shapes and sizes, but in …

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Find Linux RAM Information Command

How do I find out ram information under Linux operating systems? You can use the following commands to find information about RAM under Linux operating systems. Find Used and Free RAM Info Command You need to use the free command: # free # free -m total used free shared buffers cached Mem: 7930 4103 3826 0 59 2060 -/+ buffers/cache: 1983 …

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RHEL / CentOS Linux: Mount and Access NTFS Partition

How to enable NTFS support on CentOS Linux version 5 or 6? How do I mount ntfs partition under RHEL 5 or 6? First, you need to install EPEL repo as described here. The following command will turn in EPEL repo on RHEL / CentOS version 6.x: # cd /tmp # wget http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm # rpm -ivh epel-release-6-8.noarch.rpm NTFS-3G NTFS-3G is a stable, …

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