Linux tutorials / Performance Analysis / Recent Posts / Redhat Enterprise Linux 6 / RHEL7
by Shujat Husain · Published April 12, 2021
For every system admin, making sure that all the servers are working fine is an important aspect of the job. So if you have a few servers, we can run commands like top or df -h or free -m to make sure that our CPU, HDD...
Linux Admin / Linux Performance / Redhat Enterprise Linux 6 / Redhat Linux Kernel / Unix Intermediate
by Ramdev · Published April 3, 2021
What is Page cache ? When a user process reads or writes a file, it is actually modifying a copy of that file in main memory. The kernel creates that copy from the disk and writes back changes to it when necessary. The memory taken up...
‘od’ writes an unambiguous representation of each FILE (‘-‘ means standard input), or standard input if none are given. Synopses: od [OPTION]… [FILE]… od [-abcdfilosx]… [FILE] [[+]OFFSET[.][b]] od [OPTION]… –traditional [FILE] [[+]OFFSET[.][b] [[+]LABEL[.][b]]] Each line of output consists of the offset in the...
Linux Admin / Linux Disk Management / Linux LVM / Redhat Enterprise Linux 6 / Rhel6 Storage / Storage Configs for Unixadmin / Storage Migrations / Unix Intermediate
by Ramdev · Published March 25, 2021
In Enterprise Linux Environment, External storage often permits devices to be accessed by multiple physical paths. This improves redundancy and availability. SAN environment Red Hat Enterprise Linux provides the device-mapper-multipath component to manage multipath capable storage and to present multipath devices to applications running on the...
Linux tutorials / Recent Posts / Redhat Enterprise Linux 6 / RHEL7
by Shujat Husain · Published March 19, 2021
Samba is an open source software, based on CIFS (Common Internet File System) that can run on Unix/Linux distributions & makes it possible to communicate with Windows machines. We use samba server mainly to share files & folder with windows client machine but we can also...
‘csplit’ creates zero or more output files containing sections of INPUT (standard input if INPUT is ‘-‘). Synopsis: csplit [OPTION]… INPUT PATTERN… The contents of the output files are determined by the PATTERN arguments as detailed below. An error occurs if a PATTERN argument refers...
What is a Leap Second? A leap second is a second which is added to Coordinated Universal Time (UTC) in order to synchronize atomic clocks with astronomical time to within 0.9 seconds.A leap second is added (can be removed but this never actually happens in reality) on the...
‘md5sum’ computes a 128-bit checksum (or “fingerprint” or “message-digest”) for each specified FILE. Note: The MD5 digest is more reliable than a simple CRC (provided by the ‘cksum’ command) for detecting accidental file corruption, as the chances of accidentally having two files with identical MD5 are...
Linux tutorials / Redhat Enterprise Linux 6 / RHEL7
by Shujat Husain · Published June 12, 2017 · Last modified May 31, 2017
Nagios core is one of the most widely used free & open-source software for monitoring our IT infrastructure. We can monitor resource utilization like memory, cpu etc of servers, firewalls, switches , network etc. In our earlier tutorial, we installed & configured a nagios server which...
Linux tutorials / Redhat Enterprise Linux 6 / RHEL7
by Shujat Husain · Published June 11, 2017 · Last modified May 31, 2017
Nagios is free and open source application that is used for monitoring the complete It infrastructure i.e. computers, firewalls, printers, networks etc. It provides real time updates of usage of various resources like ram, hdd or cpu usage of the systems & also provides alerts when...
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