We’ll show you, How to Install Graylog Server on Ubuntu 16.04. Graylog is a free and open source, centralized log management tool based on MongoDB and Elasticsearch. Using Graylog you can easily collect and analyze your server logs. Graylog is made up of three components Elasticsearch, MongoDB and Graylog server. Elasticsearch is used to store the logs and provide searching facilities. MongoDB stores the configuration and meta information. Graylog server collects the log messages from different inputs and provides a web interface for managing the logs. Installing Graylog Server on Ubuntu 16.04 is not so complicated and should be done in less then 10 minutes.