Logging

Introduction> Introduction # Linux system administrators often need to look at log files for troubleshooting purposes. This is one of the first things a sysadmin would do. Linux and the applications that run on it can generate all different types of messages, which are recorded in various log files.

Introduction> Introduction # The Elastic Stack — formerly known as the ELK Stack — is a collection of open-source software produced by Elastic which allows you to search, analyze, and visualize logs generated from any source in any format, a practice known as centralized logging.

Introduction> Introduction # The Linux Auditing System helps system administrators create an audit trail, a log for every action on the server. We can track security-relevant events, record the events in a log file, and detect misuse or unauthorized activities by inspecting the audit log files.

About Logrotate> About Logrotate # Logrotate is a utility/tool that manages activities like automatic rotation, removal and compression of log files in a system. This is an excellent tool to manage your logs conserve precious disk space.

Status: Deprecated> Status: Deprecated # This article covers a version of Ubuntu that is no longer supported. If you are currently operate a server running Ubuntu 12.04, we highly recommend upgrading or migrating to a supported version of Ubuntu:

Introduction> Introduction # When running multiple services and applications on a Kubernetes cluster, a centralized, cluster-level logging stack can help you quickly sort through and analyze the heavy volume of log data produced by your Pods.

Introduction> Introduction # An effective logging solution is crucial to the success of any application. In this guide we’ll focus on a logging package called Winston, an extremely versatile logging library and the most popular logging solution available for Node.

Note: This tutorial is for an older version of the ELK stack, which is not compatible with the latest version. The latest version of this tutorial is available at How To Install Elasticsearch, Logstash, and Kibana (ELK Stack) on Ubuntu 14.

Introduction> Introduction # In this tutorial, we will cover the installation of Graylog2 (v0.20.2), and configure it to gather the syslogs of our systems in a centralized location. Graylog2 is a powerful log management and analysis tool that has many use cases, from monitoring SSH logins and unusual activity to debugging applications.

Introduction> Introduction # To save yourself some trouble with your web server, you can configure logging. Logging information on your server gives you access to the data that will help you troubleshoot and assess situations as they arise.

Introduction> Introduction # Applications create what are called “log files” to keep track of activities taking place at any given time. These files, which are far from being simple text outputs, can be very complex to go through, especially if the server being managed is a busy one.

Introduction> Introduction # In this tutorial, we will go over the installation of the Elasticsearch ELK Stack on Ubuntu 14.04—that is, Elasticsearch 2.2.x, Logstash 2.2.x, and Kibana 4.5.x. We will also show you how to configure it to gather and visualize the syslogs of your systems in a centralized location, using Filebeat 1.

Introduction> Introduction # In this tutorial, we will go over the installation of the Elasticsearch ELK Stack on CentOS 7—that is, Elasticsearch 2.2.x, Logstash 2.2.x, and Kibana 4.4.x. We will also show you how to configure it to gather and visualize the syslogs of your systems in a centralized location, using Filebeat 1.

Introduction> Introduction # In recent years, Linux distributions have increasingly transitioned from other init systems to systemd. The systemd suite of tools provides a fast and flexible init model for managing an entire machine from boot onwards.

Introduction> Introduction # Once your application is up and running in a cloud server environment, you may be wondering how you can improve your server environment to make the leap from “it works” to a full-fledged production environment.

The author selected Software in the Public Interest to receive a donation as part of the Write for DOnations program. Introduction> Introduction # The Elastic Stack — formerly known as the ELK Stack — is a collection of open-source software produced by Elastic which allows you to search, analyze, and visualize logs generated from any source in any format, a practice known as centralized logging.

An Article from Elastic> An Article from Elastic # Introduction> Introduction # Making sense of the millions of log lines your organization generates can be a daunting challenge. On one hand, these log lines provide a view into application performance, server performance metrics, and security.

Status: Deprecated> Status: Deprecated # This article covers a version of CentOS that is no longer supported. If you are currently operating a server running CentOS 6, we highly recommend upgrading or migrating to a supported version of CentOS.

Introduction> Introduction # This tutorial is an ELK Stack (Elasticsearch, Logstash, Kibana) troubleshooting guide. It assumes that you followed the How To Install Elasticsearch, Logstash, and Kibana (ELK Stack) on Ubuntu 14.

Introduction> Introduction # Logrotate is a system utility that manages the automatic rotation and compression of log files. If log files were not rotated, compressed, and periodically pruned, they could eventually consume all available disk space on a system.