What is Syslog Server How Syslog Server Works | Syslog Server | Logs

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What Is Syslog? Syslog Server vs. Event Log Explained + Recommended Syslog Management Tool

What Is Syslog?
What Does Syslog Do?
Syslog vs. Event Log
What Is Syslog Server?
Why Use Syslog?
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System Logging Protocol (Syslog) is a way network devices can use a standard message format to communicate with a logging server. It was designed specifically to make it easy to monitor network devices. Devices can use a Syslog agent to send out notification messages under a wide range of specific conditions.

Syslog works on all flavors of Unix, Linux, and other *nix, as well as MacOS. Windows-based servers don’t support Syslog natively, but many third-party tools are available to allow Windows devices to communicate with a Syslog server.
Note: the term “Syslog” can variously refer to the actual server process or “daemon” (the Syslog daemon is called syslogd when someone is being precise), the message format, and the protocol. This happens with widely used systems that have been around for a while and have multiple uses.
The Necessity of Logging
A big advantage of syslog is that the log server can monitor a vast number of syslog events via log files. Routers, switches, firewalls, and servers can generate log messages, as well as many printers and other devices.
Syslog Messages
Syslog messages are sent via User Datagram Protocol (UDP), port 514. UDP is what is called a connectionless protocol, so messages aren’t acknowledged or guaranteed to arrive. This can be a drawback but also leaves the system simple and easy to manage.
Collecting and Managing Data
Because of the large amount of Syslog data that results from retaining all of these messages, a Syslog server needs a large database.
Security Information and Event Management (SIEM) software provides a way to track, integrate, and analyze the vast amount of log data Syslog collects. Originally focused on compliance reporting, SIEM is now more widely used and can be a useful adjunct to Syslog.
How Syslog Differs From SNMP
Simple Network Management Protocol (SNMP) is another protocol for network device monitoring. SNMP works differently, getting most of its information by polling devices. Syslog servers can often accept SNMP data, particularly SNMP traps, that is, SNMP-enabled devices send without being polled.
Differing flavors of Syslog
In addition to Syslog, there are rsyslog and syslog-ng. Syslog is the original recipe, dating back to the early 1980s, while the other two are slightly differing flavors that have come out since.
Syslog-ng was begun in 1988 and adds some new filtering and encryption functions. Its syntax is not directly derived from syslog and so a syslog-ng server and syslog-ng configuration are somewhat different. You can learn more about how to install syslog-ng here.
Both syslog-ng and rsyslog can also use TCP, TLS, and RELP, in addition to UDP

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What is Syslog Server How Syslog Server Works | Syslog Server | Logs

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