Linux

Introduction Ubuntu 24.04 LTS was launched on April 25th, 2024. As this version is an LTS (Long-Term Support) release, it will be supported for 5 years. In this post we are going to explain how to update your Ubuntu using the CLI. Backup Do a backup of important data before start. It is important because the update action has some risks and could damage the system. Update your packages It’s a good practice to have your packages updated before starting the system update process. ...

In some situations could be needed to know exactly which DNS server is being used by an Ubuntu host. There are several ways to get this info, however the best option I have found is to use the resolvectl service. This service is in charge of the name resolution of the local applications. You can use it executing resolvectl status or just resolvectl. The command will return the DNS servers configured in each network interface, and which one is currently being used. ...

Introduction During the last few years, I have started several blogs (not much success, it must be said). A technology one, my photography web, and a blog with personal matters, which I decided to close. All of them were made with the same CMS platform: WordPress. WordPress has some advantages, such as its ease of use or the great community behind it. However, I was tired of the huge amount of resources I needed to deploy the CMS and give a good experience to the readers of my blog. It is needed to install a MySQL database, deploy PHP on the server, and install several plugins on WordPress to optimize the experience. ...

Introduction After installing a new Ubuntu system, I always set the language configuration to fit my local environment. Locales configuration Connect to a terminal of your machine and execute next command: sudo dpkg-reconfigure locales After this, you will see a list of languages and countries. You have to select with space bar the language and country you need. In my case, as I live in Spain, I have selected es_ES.UTF-8. It is recommended to choose UTF-8 version. ...

It’s quite useful to have at your fingertips the option of getting your public IP address. Here I will give you various commands to get the IP. Note not all of them have IPv6 service, so only works with IPv4. IPv4 & IPv6 If you have a connection to the Internet with IPv6, by default, it will be used this interface. However you could force the IPv4 use just adding the -4 option to the curl command. Something like curl -4 ip.sb. ...

Introduction In some circunstances it’s not easy to know the commands which exist to compress or decompress files in Linux (and Unix) environments. In this posts, I have wrote all the commands I have used for this. File Types TAR files Pack: tar -cvf file.tar file1 file2 file3 Unpack: tar -xvf file.tar See content: tar -tf file.tar GZ files Compress: gzip -9 file Decompress: gzip -d file BZ2 files Compress: bzip2 file Decompress: bzip -d file.bz2 TGZ (or TAR.GZ) files (TAR+GZIP) Compress+Pack: tar -czf file.tgz file1 file2 file3 Decompress+Unpack: tar -xvzf file.tgz See content: tar -tzf file.tgz TAR.BZ2 files (TAR+BZIP) Compress+Pack: tar -c files | bzip2 > fileo.tar.bz2 Decompress+Unpack: bzip2 -cd file.tar.bz2 | tar -xv See content: bzip2 -cd file.tar.bz2 | tar -t ZIP files Compress+Pack: zip file.zip file1 file2 file3 Decompress+Unpack: unzip file.zip RAR files Compress+Pack: rar -a file.rar file1 file2 file3 Decompress+Unpack: rar -x file.rar See content: rar -l file.rar

Grafana is an open source metric analytics & visualization tool which can help us to monitor the system with a nice Dashboard. Installing Grafana Grafana is available in the APT packages repository, however it could not be the latest version, so we’ll use the official Grafana repository. First, it is needed to install the software needed before install Grafana. sudo apt install -y apt-transport-https sudo apt install -y software-properties-common wget ...

First off, as a prerequisite it is needed to have a CLI access to the Debian OS. It can be done using a keyboard and a screen connected to the Raspberry Pi, or using a SSH connection. If you have followed the post of how to install Debian On a Raspberry Pi 4, you should be able to access with SSH using the Ethernet (RJ45) port. Also, you should have the SSID and the password of your Wi-Fi connection, and it should be enabled the DHCP protocol in your router. ...