CentOS 7
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Use mod_limitipconn
2015/10/27
 
Use mod_limitipconn to limit concurrent connection per IP address.
[1] Install mod_limitipconn.
# install from EPEL

[root@www ~]#
yum --enablerepo=epel -y install mod_limitipconn
[2] Configure mod_limitipconn as an example.
[root@www ~]#
vi /etc/httpd/conf.d/limitipconn.conf
# set no limitation for default
MaxConnPerIP 0

# set for /limit
<Location /limit>
    # limit concurrent connection for 3
    MaxConnPerIP 3
    # not apply above if MIME type is "text/*"
    NoIPLimit text/*
</Location>

# set for /limit2
<Location /limit2>
    # limit concurrent connection for 2
    MaxConnPerIP 2
    # apply above if MIME type is "application/x-tar"
    OnlyIPLimit application/x-tar
</Location>

[root@www ~]#
systemctl restart httpd
[3] Verify it work normally with a command "ab" which is included in httpd-tools package like follows.
[root@www html]#
ab -n 10 -c 10 http://localhost/limit/index.html

This is ApacheBench, Version 2.3 <$Revision: 1430300 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking localhost (be patient).....done

Server Software:        Apache/2.4.6
Server Hostname:        localhost
Server Port:            80

Document Path:          /limit/index.html
Document Length:        130 bytes

Concurrency Level:      10
Time taken for tests:   0.004 seconds
Complete requests:      10
Failed requests:        0
Write errors:           0
Total transferred:      3910 bytes
HTML transferred:       1300 bytes
Requests per second:    2223.21 [#/sec] (mean)
Time per request:       4.498 [ms] (mean)
Time per request:       0.450 [ms] (mean, across all concurrent requests)
Transfer rate:          848.90 [Kbytes/sec] received
.....
.....

[root@www html]#
ab -n 10 -c 10 http://localhost/limit/test.gif

This is ApacheBench, Version 2.3 <$Revision: 1430300 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking localhost (be patient).....done


Server Software:        Apache/2.4.6
Server Hostname:        localhost
Server Port:            80

Document Path:          /limit/test.gif
Document Length:        228 bytes

Concurrency Level:      10
Time taken for tests:   0.005 seconds
Complete requests:      10
Failed requests:        7
   (Connect: 0, Receive: 0, Length: 7, Exceptions: 0)
Write errors:           0
Non-2xx responses:      7
Total transferred:      4838 bytes
HTML transferred:       2777 bytes
Requests per second:    2182.45 [#/sec] (mean)
Time per request:       4.582 [ms] (mean)
Time per request:       0.458 [ms] (mean, across all concurrent requests)
Transfer rate:          1031.12 [Kbytes/sec] received
.....
.....

[root@www ~]#
ab -n 10 -c 10 http://localhost/limit2/test.tar

This is ApacheBench, Version 2.3 <$Revision: 1430300 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking localhost (be patient).....done


Server Software:        Apache/2.4.6
Server Hostname:        localhost
Server Port:            80

Document Path:          /limit2/test.tar
Document Length:        10240 bytes

Concurrency Level:      10
Time taken for tests:   0.006 seconds
Complete requests:      10
Failed requests:        8
   (Connect: 0, Receive: 0, Length: 8, Exceptions: 0)
Write errors:           0
Non-2xx responses:      8
Total transferred:      24900 bytes
HTML transferred:       22872 bytes
Requests per second:    1785.40 [#/sec] (mean)
Time per request:       5.601 [ms] (mean)
Time per request:       0.560 [ms] (mean, across all concurrent requests)
Transfer rate:          4341.44 [Kbytes/sec] received
.....
.....
 
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