I will give an example of setting up a simple mail server on Postfix, Dovecot and MySQL.
Continue reading “Mail server with Postfix, Dovecot and MySQL”
For the test, I use the Ubuntu 16.04 operating system.
In this article I will give an example of changing gc_thresh on Linux, this parameter usually needs to be increased on highly loaded access servers.
Continue reading “Changing gc_thresh on Linux”
In this article I will give examples of network configuration using Netplan.
Continue reading “How to configure networking with Netplan”
I also note that for example, starting with Ubuntu version 18.04, Netplan is used by default.
I will give an example of IPTables rules for BGP.
Continue reading “IPTables Rules for BGP”
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.
Continue reading “How to enable port 587 in Postfix”
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.
Continue reading “ABillS. SNMP Port Shift”
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.
Continue reading “Process monitoring through strace”
Logkeys – a utility that records keystrokes in a file.
Continue reading “Installing Logkeys on Linux”
Open the configuration file for the LightDM display manager in a text editor, which is used by default for Ubuntu and Xubuntu distributions:
Continue reading “How to disable guest access in Ubuntu”