Linux

How to check whether UDP connection is open or not?

Tags: Server Managementserver monitoring

Published on : February 12, 2019 by

How to check whether UDP connection is open or not?

UDP is being a connectionless protocol, you can t reliably say that the port is open or not. Below two commands are the only way of checking the same. When you send a packet to the open port, there need not be any acknowledgment saying that the port is open. Theoretically, UDP should give a […]

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SysAdmin series – Understanding the lsof output

Tags: Server Management

Published on : February 4, 2019 by

SysAdmin series – Understanding the lsof output

lsof command displays the list of open files. It could be the list of files opened by a process or it could be a list of files opened by a user or it could be a list of files opened by an IP or it could be a list of files opened by a port. […]

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How to secure SSH access to your server using TORʼs hidden service ?

Tags: Server Management

Published on : January 22, 2019 by

How to secure SSH access to your server using TORʼs hidden service ?

TOR in a first glance, is used to browse the darknet or to by-pass the firewall restriction. i.e if your firewall blocks certain website you can use TOR browsers to access them. Its really tough to block access to TOR network when your users are using TOR bridges. I know of a few firewalls which […]

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Everything about SWAP in Linux – why do we need swapping ?

Tags: LinuxServer Management

Published on : January 14, 2019 by

Everything about SWAP in Linux – why do we need swapping ?

Swap space in Linux is used when the amount of physical memory (RAM) is full. If the system needs more memory resources and the RAM is full, inactive pages in memory are moved to the swap space. Swap space is located on hard drives, which have a slower access time than physical memory and is […]

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Init v/s Systemd

Tags: Initsystemd

Published on : December 17, 2018 by

Init v/s Systemd

Init and systemd are both system and service managers associated with Linux systems. They are responsible for booting the machine once the kernel is loaded, and their tasks range from mounting the original file system, identifying the runlevel or target and loading the operating system accordingly along with activating the services associated with that runlevel and finally displaying the login screen. Init was […]

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