HOW-TO: Install Graylog on a single server

Here’s a no-frills rundown of the procedure that I followed to install the Graylog 2.5 Log management application on a RHEL 7.6 VM with outbound connectivity (tcp/443) to the internet:

STEP 1: Install Java and Utilities

sudo yum install java-1.8.0-openjdk-headless.x86_64 epel-release
sudo yum install pwgen

STEP 2: Install and start mongoDB

Configure the mongodb repository by creating /etc/yum.repos.d/mongodb-org-3.6.repo with the following:

[mongodb-org-3.6]
name=MongoDB Repository
baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/3.6/x86_64/
gpgcheck=1
enabled=1
gpgkey=https://www.mongodb.org/static/pgp/server-3.6.asc

Install and start mongodb

sudo yum install -y mongodb-org
sudo systemctl enable mongod.service
sudo systemctl start mongod.service

STEP 3: Install and start Elasticsearch

Create /etc/yum.repos.d/elasticsearch.repo with the following:

[elasticsearch-6.x]
name=Elasticsearch repository for 6.x packages
baseurl=https://artifacts.elastic.co/packages/6.x/yum
gpgcheck=1
enabled=1
gpgkey=https://artifacts.elastic.co/GPG-KEY-elasticsearch
autorefresh=1
type=rpm-md

Install elasticsearch

sudo yum install elasticsearch

Configure elasticsearch by editing /etc/elasticsearch/elasticsearch.yml and setting the following:

cluster.name: graylog

Enable and start elasticsearch

sudo systemctl enable elasticsearch.service
sudo systemctl restart elasticsearch.service

STEP 4: Install and start Graylog

Install Graylog

sudo rpm -Uvh https://packages.graylog2.org/repo/packages/graylog-2.5-repository_latest.rpm
sudo yum install graylog-server

Generate a password for Graylog

echo -n "Enter Password: " && head -1 </dev/stdin | tr -d '\n' | sha256sum | cut -d" " -f1

Edit /etc/graylog/server/server.conf and set password_secret (use instructions in file), root_password_sha2 (use command above) rest_listen_uri and web_listen_uri

Enable and start the graylog server

sudo systemctl enable graylog-server.service
sudo systemctl start graylog-server.service

STEP 5: Install and setup nginx (reverse proxy for Graylog) – Optional

If you do not wish (or cannot due to blocked ports) to access the Graylog UI at port 9000, you may set up an nginx reverse proxy as per the following:

Install nginx

sudo yum install nginx

Configure nginx

Set up the following nginx configuration file

server
{
    listen      443 ssl spdy;
    server_name graylog.example.org;
    # &lt;- your SSL Settings here!
 
    location /
    {
      proxy_set_header Host $http_host;
      proxy_set_header X-Forwarded-Host $host;
      proxy_set_header X-Forwarded-Server $host;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header X-Graylog-Server-URL https://$server_name/api;
      proxy_pass       http://127.0.0.1:9000;
    }
}

Start nginx

sudo systemctl enable nginx
sudo systemctl start nginx

You may now access the Graylog Web application (UI) at http://<hostname>:9000 (if you did not set up nginx) or https://<hostname> (with nginx).

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