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Deploying Zabbix Network Monitoring on CentOS 7.5 Virtual Machine

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This guide has been updated to include the latest PHP 7.3.X and MariaDB 10.4.X.

In the blog post, I will cover the installation of Zabbix Network Monitoring.

For those who don’t know Zabbix is an open-source monitoring software tool for diverse IT components, including networks, servers, virtual machines (VMs) and cloud services. Zabbix provides monitoring metrics, among others network utilization, CPU load and disk space consumption. Zabbix monitoring configuration can be done using XML based templates which contain elements to monitor. The software monitors operations on Linux, Hewlett Packard Unix (HP-UX), Mac OS X, Solaris and other operating systems (OSes); however, Windows monitoring is only possible through agents. Zabbix can use MySQL, MariaDB, PostgreSQL, SQLite, Oracle or IBM DB2 to store data. Its backend is written in C and the web frontend is written in PHP. Source: https://en.wikipedia.org/wiki/Zabbix

The Virtual Machine I’ve provisioned for this post is a Generation Two Hyper-V Profile.
Specs are shown below. With a 120Gb Virtual Disk.

You can follow the office installation process here: https://www.zabbix.com/download However I found bits undocumented and required some jumping around and going to the forums when I had some issues with some services not starting on reboot. So I thought I’d take the time to create a complete end to end guide on installing Zabbix on CentOS 7.6. If you’d like a guide on installing CentOS 7.6 on Hyper-V [Look Here].

NOTE: This guide will start from post CentOS Installation and Patch Updates.

Open PuTTY and connect to the Virtual Machine:

Zabbix Monitoring Backup Installation and Configuration

Now let’s elevate to root status by using the following command:

sudo -s

By Default the SELinux Status is configured as ENFORCING, This will cause issues later on with the Zabbix Installation, We need to change the SELinux status to: PERMISSIVE

sed -i s/^SELINUX=.*$/SELINUX=permissive/ /etc/selinux/config

We need to restart the Virtual Server for this change to take place.

reboot now

NOTE: Remeber to elevate your session to root!

Running the following command now shows that the SELinux status as changed, and we can now begin the installation.

getenforce

Next, Let’s add the official PHP 7.3 RPM

yum install -y wget
wget https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
wget http://rpms.remirepo.net/enterprise/remi-release-7.rpm
rpm -Uvh remi-release-7.rpm epel-release-latest-7.noarch.rpm

Next, we need to enable the PHP7.3 Repository.

yum-config-manager --enable remi-php73
yum install -y php php-mysql php-pecl-mysql php-mysqlnd

Next, we need to configure the /etc/php.ini file.

vi /etc/php.ini

Next, we need to configure the PHP Time Zone, You can get the Time Zone List [Here]

Next, the ‘ post_max_size ‘ need to be set to 16M

Next, the ‘ max_execution_time ‘ need to be set to 300

Next, the ‘ max_input_time ‘ need to be set to 300

Press Esc key to exit the VIM Input Mode then:

:w
:q

Now let’s upgrade MariaDB to the latest production release (10.4 Stable)

curl -sS https://downloads.mariadb.com/MariaDB/mariadb_repo_setup | sudo bash
yum install -y mariadb-server

Before we start the MariaDB service, we need to add a couple of extra lines to the server.conf file

vi /etc/my.cnf.d/server.cnf

This is required as there is a configuration Bug with MariaDB 10.4.x which has been reported here: https://support.zabbix.com/browse/ZBX-16465

innodb_strict_mode=0
innodb_file_per_table=1
innodb_file_format = Barracuda

Press Esc key to exit the VIM Input Mode then :w then :q

systemctl enable mariadb
systemctl start mariadb

Now let’s Configure the MariaDB MySQL Server. Firstly let’s run through the secure setup:

mysql_secure_installation

Now authenticate to the database using the Root Password we have just created:

mysql -u root -p
create database zabbix character set utf8 collate utf8_bin;
grant all privileges on zabbix.* to zabbix_dba@localhost identified by '53cP@$$w0rd!';
FLUSH PRIVILEGES;
FLUSH TABLES;
quit;

Now let’s add the Zabbix Repositories.

rpm -Uvh https://repo.zabbix.com/zabbix/4.2/rhel/7/x86_64/zabbix-release-4.2-2.el7.noarch.rpm ; yum update
yum -y install zabbix-server-mysql zabbix-web-mysql zabbix-agent

Now import initial schema and data for the server with MySQL:

zcat /usr/share/doc/zabbix-server-mysql*/create.sql.gz | mysql -u zabbix_dba -p zabbix

Next, we need to edit the zabbix_server.conf file and add the DBA Credentials

vi /etc/zabbix/zabbix_server.conf

Edit the DBUser if you changed it from zabbix_dba

Edit DBPassword

Next, we need to configure the Time Zone, You can get the Time Zone List [Here]

vi /etc/httpd/conf.d/zabbix.conf

Now lets Enable and start the Zabbix services

systemctl enable zabbix-server zabbix-agent httpd
systemctl restart zabbix-server zabbix-agent httpd 
systemctl status zabbix-server zabbix-agent httpd 

Next, we need to configure the Internal Firewall rules.

firewall-cmd --permanent --add-port=10050/tcp
firewall-cmd --permanent --add-port=10051/tcp
firewall-cmd --permanent --add-port=80/tcp
firewall-cmd --reload
systemctl restart firewalld

Zabbix Monitoring Front End Configuration

Connect to the Web Interface using the same IP Address which we used to initiate the SSH Session.

http://0.0.0.0/zabbix

Click ‘Next’.

Click ‘Next’.

Add the Zabbix database password and then click ‘Next’.

Configure the Server ‘Web’ Hostname, then click ‘Next’.

Final Pre-Flight Summary, If you’re happy then let’s go!

Installation completed, Time to Login!

Zabbix 4.2 Quick Start Guide: https://www.zabbix.com/documentation/4.2/manual/quickstart/login

The Default Login Credentials for Zabbix Network Monitoring are

Admin – zabbix

Zabbix Network Monitoring Default Dashboard.

And that’s It for the Initial Setup of Zabbix. In the Next Post, I will configure Configuring and Deploying the Network Agent and some Group Policy Objects which can help save time.

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