Hi Le Sok,
Hope you are doing well. Thank you for using Wazuh
You can download the rpm file from here.
https://packages.wazuh.com/4.x/yum/wazuh-manager-4.5.2-1.x86_64.rpm
Check the list of appropriate agent packages to download for your monitored system in the document.
https://documentation.wazuh.com/current/installation-guide/packages-list.html
Copy the downloaded rpm file into your CentOS system.
Go to the directory where the file is located
Install using this command
sudo rpm -i FileName
Next Go to vi /var/ossec/etc/ossec.conf
And update the manager IP.
Next, restart the service.
service wazuh-agent start
Or
service wazuh-agent restart
Also, you can check this document for monitoring agents without Internet access using a forwarding proxy
https://documentation.wazuh.com/current/cloud-service/your-environment/agents-without-internet.html
I hope this helps. Please let me know if you need any further help or assistance.
Regards
Md. Nazmur Sakib