Linux – IT Blog

IPTables Rules for BGP

I will give an example of IPTables rules for BGP.

How to enable port 587 in Postfix

By default, Postfix listens for connections on port 25/tcp and in this article I will show what needs to be done so that it starts to happen port 587 (submission), since for example in many mail clients when setting up mail, port 587 is offered by default.

Phabricator. How to allow users to create repositories

By default, only administrators can create repositories in Phabricator.

ABillS. SNMP Port Shift

I noticed once that on Huawei switches SNMP port indices can be shifted, for example, on Huawei s2326 VLANs are considered first, for example ifIndex.1 is vlan1, ifIndex.2, ifIndex.3, ifIndex.4 are user VLANs, and then ifIndex5 is the port Ethernet1. Because of this, when binding client services to switch ports in ABillS, the ports will not be displayed correctly.

Process monitoring through strace

I will give an example of running the strace utility, which allows you to track what a process or command is doing at a given moment.

Installing Logkeys on Linux

Logkeys – a utility that records keystrokes in a file.

How to disable guest access in Ubuntu

Open the configuration file for the LightDM display manager in a text editor, which is used by default for Ubuntu and Xubuntu distributions:

Shutting down the Linux server with the Power button

There were cases when it was urgent to turn off some Linux Ubuntu servers using the Power button, but when it was pressed, nothing happened. And to go over SSH and enter the poweroff or shutdown commands, the option is not optimal. So the solution to this inconvenience is to install ACPID (Power Management Services):

How to write CRON logs to a separate file

By default, cron logs are written to the /var/log/syslog file, and the result of the tasks is sent to an email to the user on whose behalf the task is executed, for example, when I executed the script, an entry was added to /var/log/syslog:

Installing Rsyslog + Loganalyzer + MySQL

I will give an example of installing and configuring Rsyslog + Loganalyzer + MySQL.