[CENTOS] [Zabbix] Does the response time of Web monitoring include image files, etc.?
Introduction
Zabbix Web monitoring can get the response time and display it as a graph, but I tried to verify whether it is the time when all the elements such as image files are read or the HTML file alone.
environment
- Zabbix 4.0.1
- CentOS 7.5 + Apache 2.4
From a web browser
First, display the page from the client with a web browser and check the log of the web server at that time.
access_log
172.16.xx.xx - - [14/Nov/2018:13:54:52 +0900] "GET / HTTP/1.1" 200 454 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0"
172.16.xx.xx - - [14/Nov/2018:13:54:52 +0900] "GET /logo1.png HTTP/1.1" 200 51614 "http://172.16.yy.yy/" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0"
172.16.xx.xx - - [14/Nov/2018:13:54:52 +0900] "GET /logo2.png HTTP/1.1" 200 51614 "http://172.16.yy.yy/" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0"
172.16.xx.xx - - [14/Nov/2018:13:54:52 +0900] "GET /logo5.png HTTP/1.1" 200 51614 "http://172.16.yy.yy/" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0"
172.16.xx.xx - - [14/Nov/2018:13:54:52 +0900] "GET /logo3.png HTTP/1.1" 200 51614 "http://172.16.yy.yy/" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0"
172.16.xx.xx - - [14/Nov/2018:13:54:52 +0900] "GET /logo4.png HTTP/1.1" 200 51614 "http://172.16.yy.yy/" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0"
172.16.xx.xx - - [14/Nov/2018:13:54:52 +0900] "GET /logo7.png HTTP/1.1" 200 51614 "http://172.16.yy.yy/" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0"
172.16.xx.xx - - [14/Nov/2018:13:54:52 +0900] "GET /logo8.png HTTP/1.1" 200 51614 "http://172.16.yy.yy/" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0"
172.16.xx.xx - - [14/Nov/2018:13:54:52 +0900] "GET /favicon.ico HTTP/1.1" 404 209 "-" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0"
172.16.xx.xx - - [14/Nov/2018:13:54:53 +0900] "GET /logo6.png HTTP/1.1" 200 51614 "http://172.16.yy.yy/" "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0"
It turned out that PNG format image files etc. are also recorded in the log.
From Zabbix
Next, set up Zabbix web monitoring and check the web server log at the time of monitoring.
access_log
172.16.zz.zz - - [14/Nov/2018:13:57:38 +0900] "GET / HTTP/1.1" 200 454 "-" "Zabbix"
Only "GET /" was recorded in the log. In other words, you can see that only the HTML file is read.
at the end
The display speed of the website is important as the word "three-second rule" is used, but the response time of Zabbix's web monitoring is not the display time as seen by the user, so don't take it for granted.