Last December Amazon announced its new EBS gp3 volumes, which offer better performance and a cost saving of 20% compared to those that have been used until now (gp2). Well, after successfully testing these new volumes with multiple clients, I can do nothing but recommend their use, because they are all advantages and in these 2 and a half months that have passed since the announcement I have not noticed any problems or side effects.
DanielScript to automatically change all gp2 volumes to gp3 with aws-cli
One of the biggest annoyances when working with AWS and your Internet connection has a dynamic IP is that when it changes, you immediately stop accessing to all servers and services protected by an EC2 security group whose rules only allow traffic to certain specific IP’s instead of allowing open connections to everyone (0.0.0.0.0/0).
DanielHow to automatically update all your AWS EC2 security groups when your dynamic IP changes
Although there are different methods for backing up MySQL and MariaDB databases, the most common and effective one is to use a native tool that both MySQL and MariaDB make available for this purpose: the mysqldump command. As its name suggests, this is a command-line executable program that allows you to perform a complete export (dump) of all the contents of a database or even all the databases in a running MySQL or MariaDB instance. Of course it also allows partial backups, i.e. only some specific tables, or even only only a subset of all the records in a table.
The mysqldump command offers a multitude of different parameters that make it very powerful and flexible. Since having so many options can be confusing, in this post I am going to collect several of the most frequent usage examples with the most common parameters and that are most useful in the day to day life of the system administrator.
DanielHow to perform MySQL/MariaDB backups: mysqldump command examples
In this post I will tell you about an Android app that is extremely useful to run commands remotely on a Linux computer: Hot Button SSH Command Widget. This application allows you to launch conveniently any command you want on a remote computer through SSH only with the push of a button on the screen of your mobile phone or tablet. This not only will facilitate automation of repetitive tasks, but also is very interesting from the perspective of security for the same reasons I exposed in my Automatically lock/unlock your screen by Bluetooth device proximity post. It will allow you for example to lock and unlock the screen without having to type your password again and again in sight of other people.
DanielLinux remote control from your smartphone via SSH button widgets
One of the most basic and common security measures that you can adopt in your working environment is to protect your computer by automatically locking the screen after a certain period of inactivity, so that it is necessary to enter a password to unlock. But there is a more effective way, and that is to configure your Linux machine so that the distance or proximity of a Bluetooth device you own, for example your cell phone or a smartwatch, automatically causes locking or unlocking the screen without having to enter any password on keyboard.
DanielAutomatically lock/unlock your screen by Bluetooth device proximity