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JohnMerlino
Asked: 2014-05-05 13:05:44 +0800 CST

apachelog shows http requests but not tcp connections

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I have installed the apachelog program on my ubuntu system. I have several virtual hosts that point to the same log file, so when I run the following, I should see all requests from the multiple sites:

$ apachetop -T 300 -f /var/log/apache2/other_vhosts_access.log

That should show all requests coming in starting now for the next 5 minutes. So I test it with multiple sites, and indeed it reports them:

last hit: 20:56:14         atop runtime:  0 days, 00:02:50             20:56:24
All:           10 reqs (   0.1/sec)       7443.0B (  103.4B/sec)     744.3B/req
2xx:       3 (30.0%) 3xx:       7 (70.0%) 4xx:     0 ( 0.0%) 5xx:     0 ( 0.0%)
R (170s):      10 reqs (   0.1/sec)       7443.0B (   43.8B/sec)     744.3B/req
2xx:       3 (30.0%) 3xx:       7 (70.0%) 4xx:     0 ( 0.0%) 5xx:     0 ( 0.0%)

 REQS REQ/S    KB KB/S URL
    3  0.04   6.0  0.1*/
    2  0.03   0.2  0.0 *
    1  0.01   0.2  0.0 /wp-includes/js/comment-reply.js
    1  0.01   0.2  0.0 /wp-content/themes/gd-theme/scripts/cycle.js
    1  0.01   0.2  0.0 /wp-content/themes/gd-theme/scripts/api.js
    1  0.01   0.2  0.0 /wp-includes/js/jquery/jquery.js
    1  0.06   0.2  0.0 /users/sign_in

One was from a wordpress site and another from ruby on rails site. Apache says there were 7 requests coming in. Maybe there were 7 http requests coming in (I highly doubt it because that ruby on rails site has several js and images to load), but actually there were only 2 tcp connections made and only two apache child processes should have been spawned, since I am using KeepAlive. Something definitely doesn't seem right with the output it is showing.

What may I be missing here?

apache-2.2

2 Answers

  1. Best Answer

    apachetop parses the access log of Apache.
    Each requests gets individually written to this log regardless of whether it was requested in a single KeepAlive session or multiple TCP sessions.

    apachetop cannot know anything about how many TCP connections have been made.
    That access log also does not contain any information about Apache childs/threads, so it also cannot report those.

    All it shows you is how many resources have been requested.

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  2. Many browsers will open up multiple connections to load resources like javascript. I see four of the requests are for java script. These connection may be closed quickly.

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