How to configure a highly available monitoring and alarm system on Linux

How to configure a highly available monitoring and alarm system on Linux

1. Overview
As enterprises have higher and higher requirements for the availability of IT systems, configuring a highly available monitoring and alarm system has become Crucial. Building a highly available monitoring and alarm system on Linux can help us detect system or application anomalies in a timely manner and take corresponding measures to deal with them and improve the stability and reliability of the system. This article will introduce how to use Zabbix and Keepalived to configure a highly available monitoring and alarm system.

2. Introduction to Zabbix
Zabbix is ​​an open source enterprise-level monitoring solution that can monitor server performance indicators, network device status, application operation, etc. Features of Zabbix include ease of use, flexibility, scalability and high performance. In this article, we will use Zabbix to implement monitoring and alarm functions.

3. Introduction to Keepalived
Keepalived is an open source high availability solution that can ensure the continuity of multiple servers. Keepalived uses Virtual Router Redundancy Protocol (VRRP) to implement server failover. When a server fails, Keepalived can automatically switch traffic to a backup server. In this article, we will use Keepalived to achieve high availability of monitoring and alarm systems.

4. Environment preparation
Before starting the configuration, we need to prepare the following environment:

1. Two Linux servers, one as the master node and one as the backup node ;
2. Install Zabbix and Keepalived on two servers respectively;
3. An available SMTP server for sending emails.

5. Configure Zabbix server

1. Install and configure Zabbix server on the master node;

   sudo apt-get install zabbix-server
   sudo nano /etc/zabbix/zabbix_server.conf

   Set database related settings in the configuration file information and SMTP server related information.

   DBHost=localhost
   DBName=zabbix
   DBUser=zabbix
   DBPassword=zabbix
   ...
   AlertScriptsPath=/usr/lib/zabbix/alertscripts

2. Install Zabbix agent on the standby node.

   sudo apt-get install zabbix-agent
   sudo nano /etc/zabbix/zabbix_agentd.conf

   Set the IP address of the Zabbix server in the configuration file.

   Server=<主节点IP>

3. Modify the Keepalived configuration file.

   sudo nano /etc/keepalived/keepalived.conf

   Change the virtual IP address in the configuration file to your own IP address.

   virtual_ipaddress {
     <虚拟IP地址>
   }

4. Start and set to start automatically at boot.

   sudo systemctl start zabbix-server
   sudo systemctl enable zabbix-server
   sudo systemctl start zabbix-agent
   sudo systemctl enable zabbix-agent

6. Configure Zabbix monitoring

1. Access the Zabbix console in the browser.

   http://<主节点IP>/zabbix

   Follow the interface guidelines to perform initial settings and create an administrator account.

2. Add a monitored host.
   In the Zabbix console of the master node, click "Configuration" > "Hosts" > "Create host" and fill in the host-related information, including name, visible name, IP address, etc.
3. Add monitoring items.
   In the Zabbix console of the master node, click "Configuration" > "Hosts" > "Item prototype" > "Create item prototype", and fill in the name, key, trigger and other information of the monitoring item as needed.
4. Create triggers.
   In the Zabbix console of the master node, click "Configuration" > "Hosts" > "Triggers" > "Create trigger", and fill in the name, function, expression and other information of the trigger as needed.

7. Testing and verification

1. Simulate failures or abnormal situations on the monitored host.
2. Check whether the Zabbix console can correctly detect faults or abnormal conditions and trigger alarm operations correctly.

8. Summary
Through the above steps, we successfully configured a highly available monitoring and alarm system. Zabbix provides powerful monitoring and alarm functions, while Keepalived ensures high availability of the system. Through reasonable configuration, customization and testing, we can effectively improve the stability and reliability of the system, discover and solve problems in a timely manner, and provide enterprise-level monitoring and alarm services.

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