Zabbix is a powerful network monitoring tool that can monitor various network devices, servers, applications, etc. The collection and processing of Zabbix monitoring data is done through poller processes, which run on Zabbix server and Zabbix proxy. However, sometimes you may encounter issues where the poller process cannot be accessed, which prevents monitoring data from being collected and processed properly. This article describes how to diagnose and resolve this issue.
1. Confirm the problem
First, you need to confirm the specific reason why the poller process cannot be accessed. Usually, it can be diagnosed in the following ways:
1. Check whether the network connection between the Zabbix server and the poller is normal. Make sure that the network connection is available and that there are no firewalls or other network devices blocking data flow.
2. Check the DNS settings of Zabbix server and poller. Make sure they both resolve each other's hostnames correctly.
3. Check the clock synchronization of Zabbix server and poller. Make sure they are all using the same time source and that the clocks are not more than a few minutes off.
4. Check the log file of the poller process. If the poller process encounters any errors while starting, they will be recorded in the log file. The location of the log files is usually specified in the poller's configuration file.
Second, solve the problem
Once you have determined the specific reason why the poller is not accessible, you can take appropriate measures to solve the problem. Here are some possible solutions:
1. Check the network connection between Zabbix server and poller. If there is any firewall or other network device blocking data flow, configure it to allow Zabbix traffic through. You can use the ping command to test network connectivity.
2. Check the DNS settings of Zabbix server and poller. Make sure they both resolve each other's hostnames correctly. If you have any problems, you can manually add the hostname to the /etc/hosts file.
3. Check the clock synchronization of Zabbix server and poller. Make sure they are all using the same time source and that the clocks are not more than a few minutes off. Clocks can be manually synchronized using the ntpdate command.
4. Check the log file of the poller process. If there are any errors, try to resolve them and restart the poller process. You can use the systemctl command to start, stop, and restart the poller process.
5. Increase the number of processes initialized when the zabbix server starts, directly increase the polling load, edit zabbix_server.conf and adjust the StartPollers parameters. 3.
Preventive measures
In addition to solving the problem, there are some preventive measures that can help avoid the poller process Inaccessible problems:
1. Make sure that the network connection between Zabbix server and poller is stable and reliable. If possible, it is recommended to deploy Zabbix server and poller in the same local area network, which can minimize the possibility of network problems.
2. Configure the correct DNS settings. Make sure Zabbix server and poller can correctly resolve each other's hostnames. It is recommended to use a DNS server to manage hostname resolution.
3. Synchronize the clock. Make sure that Zabbix server and poller use the same time source and that the clocks are not more than a few minutes off. You can use the ntpdate command to manually synchronize the clock, or use an NTP server to automatically synchronize the clock.
Check the log files regularly. Check the log files of the poller process regularly so that any problems can be identified and resolved in a timely manner.
In conclusion, to deal with the problem of Zabbix unreachable poller processes, it is necessary to first identify the problem, and then take appropriate measures to solve the problem. By taking preventive measures, you can help avoid these problems.
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