Linux – IT Blog

How to change gateway in Linux

Once I needed to change the default gateway on different servers without restarting the network service or rebooting the server, I will give examples of how I did this.

Monitoring Linux directory size in Zabbix

One day I needed to monitor the size of a directory in Zabbix and create a trigger so that Zabbix would notify when the directory size increases.

How to add a blackhole route in Netplan

I will give an example of setting up blackhole routes in Netplan.

Setting up Firewall in Proxmox

I will give an example of enabling and configuring the Firewall in Proxmox. By default, the Firewall is disabled and there are open ports, for example: SSH, 111, 3128, 8006.

How to restrict access to the Proxmox WEB interface

I will give an example of restricting access to the Proxmox web interface on port 8006.

Key ‘x’ doesn’t exist in table ‘x’

Once after updating the ABillS billing system, when opening the Maintenance>Hardware>PON menu and selecting a device, an SQL error occurred:

Upgrade from Ubuntu 20.04 to 22.04 using “do-release-upgrade” command

For example, I will upgrade Ubuntu Server 20.04 to version 22.04.

Bird log rotation

I will give an example of the Bird log rotation script, since by default it was not in Ubuntu 18 and in neighboring versions too.

Moving Nextcloud to another server

For example, I will transfer Nextcloud from one Linux server to another and change the domain.

Migrating from Quagga to Bird

For example, I will give a simple example of migrating from Quagga to Bird, that is, how can you install Quagga and Bird at the same time on the same server, and switch between them.