Analysis of the HTTP codes is the fastest way to determine the current status of the monitored web server. By HTTP specifications RFC 2616, any web server returns several HTTP codes.
First of all, it monitors for a proper HTTP return code.
When monitoring a web server for potential problems, an external web monitoring service checks a number of parameters. The more the locations used, the more complete is the picture on network availability. By having multiple servers in different geographic locations, a monitoring service can determine if a Web server is available across different networks worldwide. Network monitoring services usually have a number of servers around the globe - for example in America, Europe, Asia, Australia and other locations. Good server monitoring tools also have performance benchmarking, alerting capabilities and the ability to link certain thresholds with automated server jobs, such as provisioning more memory or performing a backup. It can also include application monitoring, such as checking the processes of programs such as Apache HTTP server, MySQL, Nginx, Postgres and others.Įxternal monitoring is more reliable, as it keeps on working when the server completely goes down. Server monitoring can encompass a check of system metrics, such as CPU usage, memory usage, network performance and disk space. some web server monitoring companies check the services status with a certain frequency.
Nms navigation data software#
web server software checks its status and notifies the owner if some services go down, and external, i.e. Monitoring an internet server means that the server owner always knows if one or all of his services go down. Typically, most network monitoring services test your server anywhere between once-per-hour to once-per-minute.įor monitoring network performance, most tools use protocols like SNMP, NetFlow, Packet Sniffing, or WMI. Site monitoring services can check HTTP pages, HTTPS, SNMP, FTP, SMTP, POP3, IMAP, DNS, SSH, TELNET, SSL, TCP, ICMP, SIP, UDP, Media Streaming and a range of other ports with a variety of check intervals ranging from every four hours to every one minute. Incorrect routing or routing issues cause undesirable performance degradation or downtime. The methods, systems, algorithms and tools to monitor the routing posture of networks. Route analytics is another important area of network measurement. Network tomography is an important area of network measurement, which deals with monitoring the health of various links in a network using end-to-end probes sent by agents located at vantage points in the network/ Internet. Monitoring the performance of a network uplink is also known as network traffic measurement. These actions vary An alarm may be sent (via SMS, email, etc.) to the resident sysadmin, automatic failover systems may be activated to remove the troubled server from duty until it can be repaired, etc. Status request failures, such as when a connection cannot be established, it times-out, or the document or message cannot be retrieved, usually produce an action from the monitoring system.
The widespread addition of WAN optimization devices is having an adverse effect on most network monitoring tools, especially when it comes to measuring accurate end-to-end delay because they limit round-trip delay time visibility. For email servers, a test message might be sent through SMTP and retrieved by IMAP or POP3.Ĭommonly measured metrics are response time, availability and uptime, although both consistency and reliability metrics are starting to gain popularity.
While an intrusion detection system monitors a network threats from the outside, a network monitoring system monitors the network for problems caused by overloaded or crashed servers, network connections or other devices.įor example, to determine the status of a web server, monitoring software may periodically send an HTTP request to fetch a page.
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