How to install GrayLog on centos
Installing Graylog on CentOS requires the following steps:
1. Add EPEL and MongoDB repositories:
sudo yum install epel-release -y
sudo rpm -Uvh https://repo.mongodb.org/yum/redhat/7/mongodb-org/4.4/x86_64/RPMS/mongodb-org-server-4.4.4-1.el7.x86_64.rpm
sudo rpm -Uvh https://repo.mongodb.org/yum/redhat/7/mongodb-org/4.4/x86_64/RPMS/mongodb-org-shell-4.4.4-1.el7.x86_64.rpm
sudo rpm -Uvh https://repo.mongodb.org/yum/redhat/7/mongodb-org/4.4/x86_64/RPMS/mongodb-org-mongos-4.4.4-1.el7.x86_64.rpm
sudo rpm -Uvh https://repo.mongodb.org/yum/redhat/7/mongodb-org-tools-4.4.4-1.el7.x86_64.rpm
sudo systemctl enable mongod && sudo systemctl start mongod
2. Add Graylog warehouse:
sudo rpm -Uvh https://packages.graylog2.org/repo/packages/graylog-4.4-repository_latest.rpm
sudo yum install graylog-server
3. Edit the Graylog configuration file /etc/graylog/server/server.conf and set the following parameters to the correct values:
password_secret = <password_secret>
root_password_sha2 = <root_password_sha2>
rest_listen_uri = http://<server_ip>:9000/api/
web_listen_uri = http://<server_ip>:9000/
Where, <password_secret>should be a random string, <root_password_sha2>should be the hashed value of the root user's password. <server_ip>is our server IP address.
4. Start the Graylog service and enable boot:
sudo systemctl enable graylog-server
sudo systemctl start graylog-server
Use your browser to access http://<server_ip>:9000/, log in as the root user and start using Graylog.
The above are the basic steps to install Graylog on CentOS.
Please note that before installing and configuring Graylog, you also need to meet some prerequisites, such as the installation and configuration of Java and Elasticsearch .
This is because the core component of Graylog needs to use Elasticsearch as its data storage backend. Graylog's log data is sent to the Graylog server via the GELF (Graylog Extended Log Format) protocol, and the Graylog server stores the data in Elasticsearch and searches and analyzes it on the web interface.
Therefore, if we want to use Graylog for log management and analysis, we need to install Elasticsearch and configure it with Graylog. As the data storage backend of Graylog, Elasticsearch provides fast search and analysis performance, while Graylog provides a powerful web interface for searching, filtering, and visualizing data stored in Elasticsearch.
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