Hi,I am running a website behind a reverse proxy in following environment. Code: Server A --------------------Server B (site running eduCommons on Plone) (running apache reverse (back end server) proxy) Server A and B are on same physical machine. B is a guest Operating System on A. Operating System on Server B is CentOS 5.5 Operating System on Server A is Ubuntu 10.04 eduCommons is a content management system. You check about it here. recorded the website loading time in the Chrome developer tools time line section and based on what I observed following page elements take more than 100 ms on the website jquery checks 113 ms http://192.168.1.5:8080/eduCommons/p...achekey0517.js 244ms http://192.168.1.5:8080/eduCommons/p...achekey1443.js 247ms http://192.168.1.5:8080/eduCommons/p...chekey5402.css like this there are some more css and page elements which have taken 100ms or 200ms in their GET request from server. on this link http://www.chicagostyleseo.com/2010/03/caffeine’s-need-for-speedhow-to-know-if-your-site-is-slow/ they mentioned what Google has defined as a slow website following words are mentioned. "Google has made it clear that any process that takes more than 100 milliseconds (1/10 of a second) is too long" So that means the website is slow. In fact I have asked a few people to access the website on internet and they too reported the same. In a step by step way then to debug the problem I did following 1) The site http://site5.abc.com was loading slowly (Some page elements showed 411ms in Google Developer tools snapshot here) 2) From my laptop checked http://192.168.1.5:8080/eduCommons ( got a few page elements 211 ms and one was 770 ms a snapshot for the 700 ms attached here) 3) Then to check if the site is loading slow on CentOS server itself I did ssh -L 8080:localhost:8080 [email protected] 4) Then from my laptop when above ssh connection on step 3 was alive http://localhost:8080/eduCommons and saw a page element loading at 411 ms. If I am not wrong then by step 4 it is confirming that site is slow on server itself. I enabled %D in /etc/httpd/conf/httpd.conf Code: LogFormat "%a %D %>s %B" resp CustomLog /var/log/httpd/site_in_question-resp_log resp but after hitting the website from different ISPs I saw there was no log in Code: /var/log/httpd/site_in_question-resp_log resp as expected. I thought that it might be permission so it I changed Code: chown apache:apache /var/log/httpd/site_in_question-resp_log I did in vhost configuration of file on CentOS Guest OS on Ubuntu Server 10.04 On the other hand I tried to do the same on reverse proxy server and then apache failed to restart. Upon checking I found a2enmod mod_log_config Code: ERROR: Module mod_log_config does not exist! Searched but any thing fruitful did not came. As per your apache documentation page I searched for this file Code: find / -name mod_log_config.c but it was not there. I would like to clear that the server is not running any thing other than eduCommons . The server on which I am running it is physically mine. 8 GB RAM ,500 G hard disk and more than 256 kbps bandwidth. What more should I do to check it and how can I over come this problem?
By this are you impling that external sites are slow? The most probable reason would be the proxy, try take that out the equation and see what you get. Good luck Marty
I could not understand your point completely. The people on internet will be able to access my website when in browser they type http://site5.abc.com above is just a dummy name. The site is hosted internally on a webserver. Any how I will give some more information after posting here I tried some thing After reading this page I added in /etc/httpd/conf/httpd.conf on Server B (CentOS Guest OS) Code: <IfDefine RequestTime> Header set X-Request-Received: %t Header set X-Request-Processing-Time: %D </IfDefine> I am able to see some response log. in /var/log/httpd/site-in-question-resp Now tell me what should I post Code: 192.168.1.5 3062 403 5043 192.168.1.5 2826 403 5043 What does this tell me ? What more should I do to check it and how can I over come this problem?
So the web server is slow on a local connection? Then you have a problem. Try 'top' or 'free' and see if the webservers have limited resorces also try 'df -h' too see if its a disk space problem. The 403 part of that message would indicate a permission error, in theroy you should get 200 :S Good luck Marty
Well I Can not say exactly what you mean by slow on a local connection if some one on my Lan is browsing the website he is getting instant response if another user outside my lan tries to access the website on internet then it is giving a problem.The server on which website is running has 8 GB Ram and 500 Gb hard disk which is 88% free.There is no heavy load since the site is under construction.
Ok, thanks for clearing that up. Whats your upload speed? http://speedtest.net Normally the upload speed will be the problem if a wan connection is appearing slow. Pls post the 'Forum Link' here
Ok on CentOS which in above diagram I gave as Sever B I posted the file here http://pastebin.com/8uwMxbPS and for Server A it is in /etc/apache2/sites-enabled site5.abc.com Code: ProxyPass / http://192.168.1.5:8080/eduCommons ProxyPassReverse / http://192.168.1.5:8080/eduCommons
Code: # #Listen 12.34.56.78:80 Listen 80 #Listen 8080 I see that you are requesting a page on port 8080 but the webserver isn't listening on that port, try uncomment it and restart the web server, only a suggestion. Good luck Marty
Exactly even I thought what you just said.But when I restarted httpd I got error. Code: service httpd restart Stopping httpd: [ OK ] Starting httpd: (98)Address already in use: make_sock: could not bind to address [::]:8080 (98)Address already in use: make_sock: could not bind to address 0.0.0.0:8080 no listening sockets available, shutting down Unable to open logs [FAILED] This error came when I uncomment that Listen 8080 line. Let me know if you have any other suggestions.
Awsome error, it means something else is listening on that port. to find out what it is run: Code: netstat -tap Your should get the service and pid on the right Thanks Marty
webcache in following output is referring to port 8080 Code: # netstat -tap Active Internet connections (servers and established) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 site5.siteinquestion.:xprint-server *:* LISTEN 5224/python2.4 tcp 0 0 *:hello-port *:* LISTEN 1742/rpc.statd tcp 0 0 *:sunrpc *:* LISTEN 1706/portmap tcp 0 0 *:webcache *:* LISTEN 5229/python2.4 tcp 0 0 site5.abc.com:smtp *:* LISTEN 2036/sendmail: acce tcp 0 0 site5.siteinquestion:x11-ssh-offset *:* LISTEN 18012/0 tcp 0 0 site5.siteinquestion.:xprint-server site5.abc.com:56072 ESTABLISHED 5224/python2.4 tcp 0 0 192.168.1.5:webcache 192.168.1.19:60533 ESTABLISHED 5229/python2.4 tcp 0 0 site5.abc.com:56072 site5.siteinquestion.:xprint-server ESTABLISHED 5229/python2.4 tcp 0 0 192.168.1.5:webcache serverA.siteinquestion.com:55012 ESTABLISHED 5229/python2.4 tcp 0 0 192.168.1.5:webcache serverA.siteinquestion.com:44424 ESTABLISHED 5229/python2.4 tcp 0 0 192.168.1.5:38380 someserver.siteinquestion.com:domain TIME_WAIT - tcp 0 0 192.168.1.5:38381 someserver.siteinquestion.com:domain TIME_WAIT - tcp 0 0 192.168.1.5:38378 someserver.siteinquestion.com:domain TIME_WAIT - tcp 0 0 192.168.1.5:38379 someserver.siteinquestion.com:domain TIME_WAIT - tcp 0 0 192.168.1.5:webcache blackberry-e63a.somdomain.:35588 ESTABLISHED 5229/python2.4 tcp 0 0 *:http *:* LISTEN 18140/httpd tcp 0 0 *:ssh *:* LISTEN 1984/sshd tcp 0 0 localhost6.l:x11-ssh-offset *:* LISTEN 18012/0 tcp 0 0 *:https *:* LISTEN 18140/httpd tcp 0 0 ::ffff:192.168.1.5:ssh jishnub08:53195 ESTABLISHED 18012/0 Above 192.168.1.19 is my laptop 192.168.1.5 is Server B 192.168.1.1 is Server A by default eduCommons uses a webserver known as Plone it is running on Port 8080. Will it make sense If I try to make apache listen to port 8080.
Proberly not. On the CentOS 5.5 Sever run Code: wget localhost:8080 If it doesnt download instantly its the sever, if it works quickly, its the bridge between server A & B. Pls post the out put of the code Good luck Marty
Here is the output as you said Code: wget localhost:8080 --2010-06-04 18:45:53-- http://localhost:8080/ Resolving localhost... 127.0.0.1 Connecting to localhost|127.0.0.1|:8080... connected. HTTP request sent, awaiting response... 200 OK Length: 2714 (2.7K) [text/html] Saving to: `index.html' 100%[==============================================================================================================================>] 2,714 --.-K/s in 0s 2010-06-04 18:45:53 (185 MB/s) - `index.html' saved [2714/2714] Apart from what you said here is what I did Code: ssh -L 8080:localhost:8080 root@servername and in browser tested Code: http://localhost:8080/VirtualHostBase/http/site5.abc.com:80/eduCommons/VirtualHostRoot This is what I is being served and makes my site slow. By default some how this is the only thing which is being served to the users on internet also. So the site is slow. Here is a snapshot of what I just said and to prove what makes it slow I again loaded the website in Chrome Developer Tools pressed Control+Shift+I and was able to record the time page elements were taking to load they showed some css or jquery took more than 100ms Here is another snapshot. What is happening is eduCommons is using a server Zope. Zope is running on port 8080 behind an Apache running on port 80. The Virtual Host Manager doesn't do anything unless it sees one of the following special path elements in a URL: VirtualHostBase sets the protocol and host, while VirtualHostRoot sets the path root. In the Proxy Pass directive I am passing the url to an internal IP where I can access the website on LAN like this http://IP:8080/eduCommons some how the first snapshot I posted is what is being served to the users on internet and that itself is taking time. So the website is slow. While on LAN where I can locally browse the website I am directly getting the response from Zope. So it is not noticeable on LAN.
I suggest you measure your site with http://gtmetrix.com/ and follow the advices given there to speed up your site.
