How To Install Graylog on CentOS 7

r00t September 6, 2017

Install Graylog on CentOS 7

In this tutorial we will show you how to install Graylog on your CentOS 7. For those of you who didn’t know, Graylog is a free and open source powerful centralized log management tool based on Elasticsearch and MongoDB. Graylog helps you to collect, index and analyze any machine logs centrally.

This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple and assumes you are running in the root account, if not you may need to add ‘sudo’ to the commands to get root privileges. I will show you through the step by step installation Graylog on a CentOS 7 server.

Install Graylog on CentOS 7

Step 1. First let’s start by ensuring your system is up-to-date.

Step 2. Installing Java.

Now you will need to install JAVA, run the following command to download the RPM package using the following command:

Once you have downloaded the RPM file, you can install the package using following command:

Check if it is successfully installed with the following command:

Step 3. Installing MongoDB.

MongoDB is not available in the default CentOS repository. You will need to add the MongoDB repo first:

Add the following contents:

Install MongoDB by running the following command:

Start the MongoDB service and enable it to start on boot with the following command:

Step 4. Installing Elasticsearch.

In order to install Elasticsearch using the official repository, we have to download and install the public signing key:

Create and add the following in your /etc/yum.repos.d/ director:

Add the following contents:

Now, install Elasticsearch using the follwing command:

Start the elasticsearch service and enable it to start on boot time with the following command:

Step 5. Configuring Elasticsearch.

First, open up the Elasticsearch configuration file:

Change the file as shown below:

Let’s prevent possible remote code executions. Add the following lines:

Restart the elasticsearch service:

Check the health of the Elasticsearch with the following command:

Step 6. Installing Graylog.

We need to download and install the Graylog repository using the following command:

Install Graylog server using yum:

After you have installed the Graylog Server, you have to generate secret key for Graylog using the following command:

Now create a hash password for the root user that can be used to log in to the Graylog web server using the following command:

Edit the server.conf file:

Make changes to the file as shown below:

To enable the Graylog web interface, make changes to the file as shown below:

After you have modified the configuration file, you can start Graylog Service using the following commands:

Step 7. Accessing Graylog.

Graylog will be available on HTTP port 8080 by default. Open your favorite browser and navigate to http://yourdomain.com:9000 or http://server-ip:9000 and complete the required the steps to finish the installation.

Install Graylog on CentOS 7

Congratulation’s! You have successfully installed Graylog. Thanks for using this tutorial for installing Graylog in CentOS 7 system. For additional help or useful information, we recommend you to check the official Graylog web site.

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