The inetd daemon The inetd daemon is best described as a super-server, created to manage many daemons or services. It listens to multiple ports, and invokes only requested services. This reduces the load that services place on a system, because it means that network services –...
Linux Networking / Linux tutorials / Recent Posts / Redhat Enterprise Linux 6 / RHEL7
by Shujat Husain · Published June 5, 2017 · Last modified May 31, 2017
When using IP based hosting to create a website, we require multiple IPs to launch multiple websites on a single apache server. For every website, we will need an IP address assigned to a single NIC or we can use IP aliasing. IP aliasing refers to...
This error message is logged by NTP daemon, and this means that the ntpd fails to adjust OS internal clock for some reasons. NTP daemon adjusts OS internal clock by invoking system call named adjtimex(). Linux kernel expects the system call to be invoked regularly, as...
EMail Posts / Linux Admin / Linux Networking / Redhat Enterprise Linux 6 / Unix Intermediate
by Ramdev · Published September 3, 2021
NTP stands for Network Time Protocol, and it is an Internet protocol used to synchronize the clocks of computers to some time reference. NTP is an Internet standard protocol originally developed by Professor David L. Mills at the University of Delaware. Time usually just advances. If you have communicating programs running on different computers, time still...
Linux Admin / Linux Networking / Redhat Enterprise Linux 6 / Unix Intermediate
by Ramdev · Published June 12, 2014 · Last modified July 2, 2015
A chroot on Unix operating systems is an operation that changes the apparent root directory for the current running process and its children. A program that is run in such a modified environment cannot name and cannot access files outside the designated directory tree. Chroot sftp...
Linux Admin / Linux Networking / Redhat Enterprise Linux 6 / Unix Intermediate
by Ramdev · Published October 16, 2021
In Red Hat Enterprise Linux 3 or later FTP service is provided by the vsftpd daemon. vsftpd stands for “Very Secure FTP Daemon” and is an FTP server for Unix-like systems. It supports IPv6 and SSL, as well as explicit and implicit FTPS. The vsftpd daemon...
Linux Admin / Linux Networking / Linux Troubleshooting
by Ramdev · Published October 17, 2013 · Last modified July 23, 2016
Bonding is a feature that can be enabled bu the Linux kernel, to allow system administrators to combine two or more network interface to form a single, logical “bonded” interface, for redundancy or increased throughput purpose. We can configure Linux bonding in 7 different modes. The behavior of the...
Just discussing some of the common sendmail issues and troubleshooting procedures in linux Problem: Sendmail can not send mail to users in other domains. Problem: Error log in sendmail.log. Problem:Sendmail rejects connection. Problem:Can not send email via web access client. Problem: Sendmail hangs on boot Problem:...
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by Ramdev · Published September 1, 2015 · Last modified September 19, 2019
Booting Tasks Read – Unexpected Server Reboots of RHEL servers on HP Read – Linux Admin Reference – RedHat Linux Grub Loader Storage Responsibilities Read – Understand Device Mapper and DM-Multipath Read – Identifying Disk Errors in Linux Read – Identify if linux was installed on...
Blog for Unix Admin / Linux Admin / Linux Networking / Linux Troubleshooting
by Ramdev · Published December 8, 2021
Network connection problems include slow connections, as well as complete loss of connectivity. Factors that may cause slow connectivity include incorrectly configured domain name system (DNS) settings, inefficiently configured routing tables, inferior cabling, overloaded servers, and network congestion. The same set of factors, as well as...
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