The Linux screen command is extremely useful for the cases when you need to start a long-running process on a remote machine. Even if your connection drops and the SSH session is terminated, with the screen command you can be sure that the process will keep running in the background and the “lost” terminal session […]
Systemctl: List Services
Most Linux distributions use systemd as a system and service manager. The systemctl is the main command in systemd, used to control services. In this tutorial i will show how to list all, enabled and running systemd services using the systemctl command.
Raspberry Pi: Docker – Install Docker on Raspberry Pi
To build and run Docker containers on Raspberry Pi it is required to install Docker itself. To install the latest version of Docker on Raspberry Pi and to be able to upgrade it easily in future – it is recommended to install Docker from the official repository. In this guide i will show how to […]
AWS CLI: S3 Versioning – List|Get Objects
Amazon S3 has a built-in versioning solution (can be enabled in the bucket’s properties tab), that helps to track all the changes that me make to the files hosted in an S3 bucket. In this note i will show how to list all the versions of an object (file) stored in an S3 bucket and […]
AWS CLI: SSL Validation Failed – [SOLVED]
Once you run some command in the AWS CLI, for example aws s3 ls, you may get the error as follows: SSL validation failed for <endpoint_url> [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed To workaround the issue you can add the –no-verify-ssl option to the AWS CLI: $ aws s3 ls –no-verify-ssl But this is not secure […]
AWS CLI: Install AWS CLI – Ubuntu Linux
The AWS CLI is a tool for managing the AWS services from the command-line. The easiest way to install the AWS CLI on Ubuntu is to get it from the official repository but the version you will get will be much older than the latest one. In this note i will show how to install […]
AWS CLI: S3 `ls` – List Buckets & Objects (Contents)
Amazon Simple Storage Service (S3) stores data as objects within resources called buckets. Each Amazon S3 object consist of a key (file name), data and metadata that describes this object. Amazon S3 lets you store and retrieve data via API over HTTPS using the AWS command-line interface (CLI). In this note i will show how […]
Raspberry Pi: Samba File Server Setup
A Samba file server enables file sharing across different operating systems over a network. It lets you access your files on a Raspberry Pi and share them with Windows, Linux and macOS clients. In this note i will show how to turn your Raspberry Pi into a file server by installing Samba and creating a […]
MongoDB: Show Collection Data – Mongo Shell
MongoDB stores data records as documents which are gathered together in collections. Databases in MongoDB hold one or more collections of documents. In this short note i will show how to show collection data in MongoDB from the command-line using the mongo shell.
Raspberry Pi: DNS Server Settings
The DNS servers in Raspberry Pi are listed in /etc/resolv.conf file. If you want to change the Raspberry Pi’s DNS server settings you shouldn’t update this file manually, because all changes will be overwritten after reboot by data that your local DHCP server provides. In this note i will show how to change DNS servers […]