The Sensu agent is a lightweight client that runs on the infrastructure components you want to monitor. The Sensu agent is available for Linux, macOS, and Windows

Install Sensu GO agent on Ubuntu 20.04

First, make sure you update your distribution:

sudo apt update
sudo apt upgrade

You also need to install some necessary packages:

sudo apt install curl gnupg unzip wget

Then, you should add the Sensu repository so that we can install the agent without problems.

curl -s https://packagecloud.io/install/repositories/sensu/stable/script.deb.sh | sudo bash

After that, you can install the agent without problems.

sudo apt install sensu-go-agent

Similarly, we have to download the initial configuration file of the agent and copy it to the appropriate path.

sudo curl -L https://docs.sensu.io/sensu-go/latest/files/agent.yml -o /etc/sensu/agent.yml

This file needs to be modified, but first, make a backup of it.

sudo cp /etc/sensu/agent.yml /etc/sensu/agent.yml.bak

And edit it to define the IP address where Sensu Backend is installed.

sudo nano /etc/sensu/agent.yml

And leave it as shown in the image:

Replace the IP by yours.

Now you can start the Sensu agent service and check its status.

systemctl start sensu-agent
systemctl status sensu-agent

There are many configurations available for the agent file at this link. Every time you modify the configuration file you have to restart the service to apply the changes.

It should now be visible from the backend. If not, you will probably need to restart the service.

Conclusion

Sensu Go is a very good tool that allows us to monitor services and nodes. This makes it interesting at a professional level. That is why it is recommended to take a look at it.

The post Install the Sensu GO agent on Ubuntu 20.04 appeared first on Linux Windows and android Tutorials.

In this site, we have already talked about Zabbix, this fantastic application that serves to monitor various services within a network. However, it is not only limited to services but also to specific nodes. So, it is open source with all the advantages we can have over it and also has agents available for various systems.

So, let us start to install Zabbix server 4.

1. Install Apache web server and PHP

Zabbix Server has a quite nice web interface that can be accessed from the clients. This interface requires a web server and PHP. Therefore, the first step in this guide is to install them both. Open a terminal and run:

:~$ su
:~# yum install httpd php php-mysql php php-mysql php-curl php-json php-cgi php-xml php-mbstring php-bcmath

Next, create a new file for test PHP.

:~# nano /var/www/html/test.php

And add the following:

<?php
phpinfo();
?>

Then, it is necessary to add the rules to the firewall to allow Apache and PHP access.

:~# firewall-cmd --permanent --add-service=http
:~# firewall-cmd --reload

After that, start and enable the service.

:~# systemctl enable httpd
:~# systemctl start httpd

Finally, open your web browser and go to http://SERVER_IP/test.php.

Now, Apache and PHP are correctly installed.

2. Install and configure MariaDB

The way Zabbix manages data efficiently is thanks to a robust and reliable database handler. Zabbix allows the use of MySQL, MariaDB, and PostgreSQL. For now, I will use MariaDB. So, the next step is to install and configure it.

:~# yum install mariadb-server

After that, star and enable the MariaDB service:

:~# systemctl enable mariadb
:~# systemctl start mariadb

Now, set a root the password using the mysql_secure_installation script.

:~# mysql_secure_installation

As you can see, there are several parameters that you can configure. In the case of this tutorial, you can answer as you want because it does not affect anything. However, I recommend you read them carefully and make the best decision. In my case, I have answered Y, N, Y, Y.

After that, it is necessary to create a database and user for Zabbix.

:~# mysql -u root -p
CREATE DATABASE zabbixdb;
GRANT ALL PRIVILEGES ON zabbixdb.* TO 'zabbixuser'@'localhost' IDENTIFIED BY 'zabbixpss';
FLUSH PRIVILEGES;
exit;

3. Install Zabbix Server 4

There is a fairly simple way to install Zabbix server 4. It is to do it through an external repository and then use yum. So let us go for it.

:~# rpm --import http://repo.zabbix.com/RPM-GPG-KEY-ZABBIX
:~# rpm -ivh https://repo.zabbix.com/zabbix/4.0/rhel/7/x86_64/zabbix-release-4.0-1.el7.noarch.rpm

Next, install Zabbix 4 agent and others required packages.

:~# yum install zabbix-server-mysql zabbix-web-mysql zabbix-agent zabbix-get zabbix-sender zabbix-java-gateway

Now, edit the PHP timezone on the Zabbix configuration file.

:~# nano /etc/httpd/conf.d/zabbix.conf

And uncomment the “date.timezone” setting and replace it with your timezone:

php_value date.timezone YOURTIMEZONE

Next, import the initial database for Zabbix.

:~# zcat /usr/share/doc/zabbix-server-mysql*/create.sql.gz | mysql -u zabbixuser -p zabbixdb

After that, you have to specify the databases parameters on the Zabbix configuration.

:~# nano /etc/zabbix/zabbix_server.conf

DBHost=localhost
DBName=zabbixdb
DBUser=zabbixuser
DBPassword=YOUR_PASSWORD

Next, set the firewall rule for Zabbix.

:~# firewall-cmd --permanent --zone=public --add-port=10051/tcp
:~# firewall-cmd --permanent --zone=public --add-port=10050/tcp
:~# firewall-cmd --reload

Finally, enable and start the Zabbix services.

:~# systemctl enable zabbix-server
:~# systemctl start zabbix-server
:~# systemctl enable zabbix-server 
:~# systemctl start zabbix-server
:~# systemctl restart httpd

After that, complete the installation.

4. Complete the installation

Now, open your web browser and go to http://SERVER_IP/zabbix and you will see this.

So, let us start.

First, the wizard will check the prerequisites. Click on next.

Next, configure the database connection. You have to type your credentials.

Next, configure the server details.

After that, you will see the installation summary.

You have successfully installed Zabbix.

Now, login into the main screen. The user is admin y and the password is Zabbix.

And you will see the dashboard.

So, that’s it.

Conclusion

With this Zabbix is installed. This wonderful monitoring program, what remains is to install the agent in each of the nodes you want to visualize.

Its installation is quite simple and only requires a little time and knowledge.

Please share this article with your friends.

The post How to install Zabbix server 4 on CentOS 7? appeared first on Linux Windows and android Tutorials.