Ifconfig Ifconfig is used to configure the kernel-resident network interfaces. It is used at boot time to set up interfaces as necessary. After that, it is usually only needed when debugging or when system tuning is needed. Netstat Netstat prints information about the Linux networking subsystem Ps ps displays information Read more…
Simple firewall management tool that uses firewalld deamon Install List all zones Rule management
Certbot it’s an cool tool that automatically enable HTTPS on your website deploying Let’s Encrypt certificates. How to Centos not snap – not anymore supported Snap install See the official guide https://certbot.eff.org/lets-encrypt/centosrhel7-apache To create the certificates Your certificates are deployed (usually) under /etc/letsencrypt/live/domain.tld/ cert.pem is the certificate privkey.pem is the Read more…
A virtual private server (VPS) is a virtual machine sold as a service by an Internet hosting service. To start having fun you need at least: 1vCpu, 2GB RAM e 20GB SSD with 100 mbps bandwidth Then Make sure that you have a root access to the VPS Secure SSH Read more…
Rsync, which stands for “remote sync”, is a remote and local file synchronization tool. It uses an algorithm that minimizes the amount of data copied by only moving the portions of files that have changed. Here an example
Docker installation for centos See active containers Docker file example Build using bocker file in the same dir See all docker images Delete an image Stop a container Enter in a container and start a /bin/bash session Copy file Docker compose up and build Prune images and containers Docker service
The first thing to do, when you setup a new server is to disable root access via ssh First you need to login with root privileges and create a new user and assign to it a new password then locate and edit you sshd_config file (usually under/etc/ssh/sshd_config) After that restart Read more…
The software utility cron also known as cron job is a time-based job scheduler in Unix-like computer operating systems. Normally the crontab util is located under /etc/crontab Locate your crontab and enter with your default editor In this case the script “test.sh” it’s executed with “root” user permission, every minutes Read more…