# Tcpcopy,an online request replication tool fit for nginx **URL:** \ **Category:** NGINX\ **Created:** [November 2, 2011, 7:21am UTC](https://www.ruby-forum.com/t/tcpcopy-an-online-request-replication-tool-fit-for-nginx/213440 "2011-11-02T07:21:57Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![dubstep](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/cdc98d/32.png) [@dubstep](https://www.ruby-forum.com/u/dubstep)\ **Post date:** [November 2, 2011, 7:21am UTC](https://www.ruby-forum.com/t/tcpcopy-an-online-request-replication-tool-fit-for-nginx/213440/1 "2011-11-02T07:21:57Z")
Tcpcopy is an online request replication tool . It may be useful for migrating to nginx from apache [GitHub - wangbin579/tcpcopy: An online request replication tool, also a tcp stream replay tool, fit for real testing, performance testing, stability testing, stress testing, load testing, smoke testing, etc](https://github.com/wangbin579/tcpcopy) or [Google Code Archive - Long-term storage for Google Code Project Hosting.](http://code.google.com/p/tcpcopy/) Posted at Nginx Forum: > **[Tcpcopy,an online request replication tool fit for nginx](https://forum.nginx.org/read.php?2,217680,217680#msg-217680)** > > Tcpcopy is an online request replication tool . It may be useful for migrating to nginx from apache https://github.com/wangbin579/tcpcopy or http://code.google.com/p/tcpcopy/ ---
**Author:** ![wangbin579](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/w/bc79bd/32.png) [@wangbin579](https://www.ruby-forum.com/u/wangbin579)\ **Post date:** [November 2, 2011, 7:35am UTC](https://www.ruby-forum.com/t/tcpcopy-an-online-request-replication-tool-fit-for-nginx/213440/2 "2011-11-02T07:35:32Z")
you can use tcpcopy to compare the performances of apache and nginx. Posted at Nginx Forum: > **[Re: Tcpcopy,an online request replication tool fit for nginx](https://forum.nginx.org/read.php?2,217680,217682#msg-217682)** > > Tcpcopy is an online request replication tool . It may be useful for migrating to nginx from apache https://github.com/wangbin579/tcpcopy or http://code.google.com/p/tcpcopy/ ---
**Author:** ![wangbin579](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/w/bc79bd/32.png) [@wangbin579](https://www.ruby-forum.com/u/wangbin579)\ **Post date:** [November 2, 2011, 7:57am UTC](https://www.ruby-forum.com/t/tcpcopy-an-online-request-replication-tool-fit-for-nginx/213440/3 "2011-11-02T07:57:07Z")
tcpcopy helps me a lot when deveploping the netease ad system and other systems Posted at Nginx Forum: > **[Re: Tcpcopy,an online request replication tool fit for nginx](https://forum.nginx.org/read.php?2,217680,217684#msg-217684)** > > Tcpcopy is an online request replication tool . It may be useful for migrating to nginx from apache https://github.com/wangbin579/tcpcopy or http://code.google.com/p/tcpcopy/ ---
**Author:** ![wangbin579](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/w/bc79bd/32.png) [@wangbin579](https://www.ruby-forum.com/u/wangbin579)\ **Post date:** [November 3, 2011, 4:03am UTC](https://www.ruby-forum.com/t/tcpcopy-an-online-request-replication-tool-fit-for-nginx/213440/4 "2011-11-03T04:03:49Z")
An example: Suppose 13 and 14 are online machines, 148 is a target machine which is similar to the online machines, and 12321 is used both as local port and remote port. We use tcpcopy to test if 148 can endure two times of current online stress. ``` Using tcpcopy to perform the above test task. the target machine(148) # modprobe ip_queue (if not run up) # iptables -I OUTPUT -p tcp --sport 12321 -j QUEUE (if not set) # ./interception online machine(13): # ./tcpcopy xx.xx.xx.13 12321 xx.xx.xx.148 12321 online machine(14): # ./tcpcopy xx.xx.xx.14 12321 xx.xx.xx.148 12321 Cpu load and memory usage are as follows: 13 cpu: 11124 adrun 15 0 193m 146m 744 S 18.6 7.3 495:31.56 ``` asyn\_server 11281 root 15 0 65144 40m 1076 S 12.3 2.0 0:47.89 tcpcopy 14 cpu: 16855 adrun 15 0 98.7m 55m 744 S 21.6 2.7 487:49.51 asyn\_server 16429 root 15 0 41156 17m 1076 S 14.0 0.9 0:33.63 tcpcopy 148 cpu : 25609 root 15 0 76892 59m 764 S 49.6 2.9 63:03.14 asyn\_server 20184 root 15 0 5624 4232 292 S 17.0 0.2 0:52.82 interception ``` Access log analysis: 13 online machine: grep 'Tue 11:08' access_0913_11.log |wc -l ``` :89316, 1489 reqs/sec 14 online machine: grep ‘Tue 11:08’ access\_0913\_11.log |wc -l :89309, 1488 reqs/sec 148 test machine: grep ‘Tue 11:08’ access\_0913\_11.log |wc -l :178175, 2969 reqs/sec request loss rate: (89316+89309-178175)/(89316+89309)=0.25% ``` From the above, we can see that the target machine can endure two ``` times of current online stress. ``` What about the cpu load ? tcpcopy on online machine 13 occupies 12.3% of cpu load, tcpcopy on ``` online 14 occupies 14% and interception on target machine 148 occupies 17%. We can see that the cpu load is very low here, and so is the memory usage. Posted at Nginx Forum: > **[Re: Tcpcopy,an online request replication tool fit for nginx](https://forum.nginx.org/read.php?2,217680,217734#msg-217734)** > > Tcpcopy is an online request replication tool . It may be useful for migrating to nginx from apache https://github.com/wangbin579/tcpcopy or http://code.google.com/p/tcpcopy/ ---
**Author:** ![wangbin579](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/w/bc79bd/32.png) [@wangbin579](https://www.ruby-forum.com/u/wangbin579)\ **Post date:** [November 3, 2011, 4:08am UTC](https://www.ruby-forum.com/t/tcpcopy-an-online-request-replication-tool-fit-for-nginx/213440/5 "2011-11-03T04:08:08Z")
a stress test for nginx written in chinese. > **[利用tcpcopy，对nginx进行压力测试，效果见正文（注意用的是tcpcopy 0.5以下的版本）\_nginx tcp...](https://blog.csdn.net/wangbin579/article/details/6929495)** > > 从上午10：41分开始试验，一直到18：17，7个半小时左右。从4台nginx服务器拷贝流量到测试服务器，由于lvs有两个虚拟ip，在在线服务器执行命令如下：\[root@bgp176-141 work\]# ./tcpcopy xxx.xxx.xxx.140 80 xxx.xxx.xxx.148 18080root@bgp176-142 work\]# ./tcpcopy xxx.xx\_nginx tcp 复制 Posted at Nginx Forum: > **[Re: Tcpcopy,an online request replication tool fit for nginx](https://forum.nginx.org/read.php?2,217680,217735#msg-217735)** > > Tcpcopy is an online request replication tool . It may be useful for migrating to nginx from apache https://github.com/wangbin579/tcpcopy or http://code.google.com/p/tcpcopy/ ---
**Author:** ![wangbin579](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/w/bc79bd/32.png) [@wangbin579](https://www.ruby-forum.com/u/wangbin579)\ **Post date:** [November 8, 2011, 3:43am UTC](https://www.ruby-forum.com/t/tcpcopy-an-online-request-replication-tool-fit-for-nginx/213440/6 "2011-11-08T03:43:10Z")
Name: tcpcopy It is a request replication tool and is mainly for testing tasks using netlink and raw sockets Description: It can help you find bugs in your online project without actually being online. And it can also be used to test the stress that a system could endure. ``` For example, if your system already has "memcached" subsystem and ``` you want to use “membase” to replace it, tcpcopy can assist you to test “membase”. While your old memcached system is still running online, tcpcopy could copy the flow of packets from memcached to membase. From the point view of membase, the flow is accessing membase(just like membase online), and it will not affect memcached at all except network bandwidth and a little cpu load. Functionalities： 1) Distributed Stress Test You can use online data to test the stress that your target machine can endure. It is better than apache ab tool and you can find bugs that only occur during high-stress situations. 2) Hot Backup It is very suitable for backup tasks if connections are short-lived and the request loss rate is very low(1/100000). 3) Normal Online Test You can find whether the new system is stable and find bugs that only occur in actual online environments. 4) Comparison Test For example, you can use tcpcopy to compare the performances of apache and nginx. Characteristics： 1)real time 2)realistic 3)efficient 4)easy to use 5)distributed 6)significant Posted at Nginx Forum: > **[Re: Tcpcopy,an online request replication tool fit for nginx](https://forum.nginx.org/read.php?2,217680,217954#msg-217954)** > > Tcpcopy is an online request replication tool . It may be useful for migrating to nginx from apache https://github.com/wangbin579/tcpcopy or http://code.google.com/p/tcpcopy/ ---
**Author:** ![wangbin579](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/w/bc79bd/32.png) [@wangbin579](https://www.ruby-forum.com/u/wangbin579)\ **Post date:** [November 10, 2011, 8:13am UTC](https://www.ruby-forum.com/t/tcpcopy-an-online-request-replication-tool-fit-for-nginx/213440/7 "2011-11-10T08:13:58Z")
tcpcopy-0.2.1.tar.gz is now available. Try it and I believe you will like this tool Posted at Nginx Forum: > **[Re: Tcpcopy,an online request replication tool fit for nginx](https://forum.nginx.org/read.php?2,217680,218138#msg-218138)** > > Tcpcopy is an online request replication tool . It may be useful for migrating to nginx from apache https://github.com/wangbin579/tcpcopy or http://code.google.com/p/tcpcopy/