What is Jenkins? Jenkins is a well-known open source CI/CD (Continuous Integration and Continuous Delivery) automation server written in Java. In this tutorial i will show how to install Jenkins on Ubuntu-18.04, 16.04 and Centos-7, 6 and how to perform initial Jenkins configuration. Jenkins requires Java, so firstly it needs to install OpenJDK-8 JRE/JDK (Java […]
Install Docker on Ubuntu-18.04
For ones, who want to build and run Docker containers on Ubuntu-18.04 – first of all it is required to install Docker itself. To install the latest version of Docker and to be able to upgrade it easily in future – it is recommended to install Docker from the official repository. In this guide i […]
Prometheus: Apache Exporter – Install and Config – Ubuntu, CentOS
What is Apache Exporter? Apache Exporter is a Prometheus exporter for Apache metrics that exports Apache server status reports generated by mod_status with the URL of http://127.0.0.1/server-status/?auto. In this article I’ll show how create Apache server status page, how to build Apache Exporter with go get and how to configure it using a systemd service […]
Vagrant: Copy File ( To | From ) – ( Host | Guest VM ) – Vagrant SCP
Very common situation when you need to perform one-time operation of copying some file or a directory between Vagrant host and guest VM and you don’t want to waste time on mounting shared volumes or performing traditional provisioning with built-in file provisioner or some configuration management tool. In the following article i will show the […]
Prometheus: Delete Time Series Metrics
Sometimes you may want to delete some metrics from Prometheus if those metrics are unwanted or you just need to free up some disk space. Time series in Prometheus can be deleted over administrative HTTP API only (disabled by default). To enabled it, pass –web.enable-admin-api flag to Prometheus through start-up script or docker-compose file, depending […]
Jinja2: Check If Variable – Empty | Exists | Defined | True
In Jinja2 templates, it is often a good practice to test if a variable exists and what value does it carry. There are several useful tests that you can make using Jinja2 builtin tests and filers. In this article, i’ll show how to test if a variable exists or not, if it is empty or […]
GoLang: Tutorial – Install Go on MacOS, Ubuntu, CentOS
What is Go? Go or Golang is a programming language created by Google in 2009 by Robert Griesemer, Rob Pike, and Ken Thompson. Go language is designed for building simple, fast and reliable software. In this tutorial i’ll show how to install Go on MacOS, Ubuntu, CentOS and how to create a simple “Hello world!” […]
Prometheus: Node Exporter – Install and Config – Ubuntu, CentOS
What is Node Exporter? Node Exporter is a Prometheus exporter for hardware and OS metrics with pluggable metric collectors. It allows to measure various machine resources such as memory, disk and CPU utilization. In this article I’ll show how to install and configure Node Exporter on Ubuntu and CentOS using a systemd service manager.
Prometheus Monitoring: Install using Docker – Ubuntu, CentOS
What is Prometheus? Prometheus is an open-source monitoring and alerting software written in Go. It collects metrics from configured targets and stores them in a local time series database. Prometheus can run rules over collected data to either aggregate and record new time series from existing data or generate alerts. To visualize the collected data […]
Install Docker Compose – Ubuntu, CentOS, MacOS
What is Docker Compose? The docker-compose is a tool for defining and running complex multi-container Docker applications. With docker-compose you can define a multi-container application in a single file, then spin your application up in a single command which does everything that needs to be done to get it running. In this note i’ll show […]