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  • Sysadmin 101: How can I figure out why my server crashes and monitor performance?

    - by bflora
    I have a Drupal-powered site that seems to have neverending performance problems. It was butt-slow about 5 months ago. I brought in some guys who installed nginx for anonymous visitors, ajaxified a few queries so they wouldn't fire during page load, and helped me find a few bottlenecks in the code. For about a month, the site was significantly faster, though not "fast" by any stretch of the word. Meanwhile, I'm now shelling out $400/month to Slicehost to host a site that gets less than 5,000/uniques a day. Yes, you read that right. Go Drupal. Recently the site started crashing again and is slow again. I can't afford to hire people to come in, study my code from top to bottom, and make changes that may or may not help anymore. And I can't afford to throw more hardware at the problem. So I need to figure out what the problem is myself. Questions: When apache crashes, is it possible to find out what caused it to crash? There has to be a way, right? If so, how can I do this? Is there software I can use that will tell me which process caused my server to die? (e.g. "Apache crashed because someone visited page X." or "Apache crashed because you were importing too many RSS items from feed X.") There's got to be a way to learn this, right? What's a good, noob-friendly way to monitor my current apache performance? My developer friends tell me to "just use Top, dude," but Top shows me a bunch of numbers without any context. I have no clue what qualifies as a bad number or a good number in Top, or which processes are relevant and which aren't. Are there any noob-friendly server monitoring tools out there? Ideally, I could have a page that would give me a color-coded indicator about how apache is performing and then show me a list of processes or pages that are sucking right now. This way, I could know when performance is bad and then what's causing it to be so bad. Why does PHP memory matter? My apparently has a 30MB memory foot print. Will it run faster if I bring that number down? Thanks for any advice. I spent a year or so trying to boost my advertising income so I could hire a contractor to solve my performance woes. I didn't want to have to learn all this sysadmin voodoo. I'm now resigned to the fact that might not have a choice.

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  • Get Started with .Net and Apache Cassandra

    - by Sazzad Hossain
    Just came across a easy and nice to read article explaining how to get started with noSQL database system. These no relational databases are getting increasingly popular to tackle the distribution and large data set problems.Cassandra's ColumnFamily data model offers the convenience of column indexes with the performance of log-structured updates, strong support for materialized views, and powerful built-in caching.The article is nicely written by Kellabyte  and shows step by step process how to get going with the programming in a .net platform.Read more here.

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  • Huge difference between Facebook Ad Click figures and Apache log requests

    - by Gearóid
    We're running a facebook ad campaign for our business but there seems to be a huge discrepancy between the number of clicks registered and the number of requests made with "facebook.com" in the HTTP referrer. The difference can be anything between 40-80 clicks/requests. I understand why the Google Analytics would be off and I understand that the figures shouldnt be exactly the same but surely if 100 people click the ad then I should be seeing at least 90 requests for the homepage with facebook.com as the referrer? Can anybody provide any insight into why this may be happening?

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  • Can I use a Retail DVD media with an OEM key to install Windows Vista?

    - by Sammy
    I got a Fujitsu computer with OEM license key and Windows Vista. I would like to reinstall Windows on it. But I didn't get any Windows media with it. However, I do poses more than just one DVD installation disc from my Retail copies of Windows Vista that I use on other computers. Can I use this media instead? Or do I have to order a specialty OEM DVD media from the manufacturer or Microsoft? Update: I have found some partition called "EISA" configuration partition. It is a hidden partition that I found in Disk Management. How can I make use of this? Do I boot from it or do I mount it to a drive letter and access it inside Windows? Can this be used to restore the computer? It is about 11 GB in size.

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  • setting apache environment variable

    - by Kiran
    My hosting environment using Server version: Apache/2.2.14 (Unix) and I am modifying ./usr/local/apache/conf/httpd.conf to set environment variable and restarting the server . SetEnv XML-RPC-IPs 193.45.32.21 I did set it as a first entry in the file and restarted the server . But even restarting if I try to print it is still getting me black , Am I missing any thing ? echo "My IP address ".$_SERVER['XML-RPC-IPs']; Thanks for your help Regards Kiran

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  • Varnish + Tomcat vs Apache + mod_jk + Tomcat

    - by Adrian Ber
    Does anyone have some comparison data in terms of performance for using in front of Tomcat either Varnish or Apache with mod_jk. I know that AJP connector suppose to be faster than HTTP, but I was thinking that in combination Varnish which is lighter and highly optimized could perform better. There is also the discussion between static resources (which I think will perform faster with Varnish than Apache, even with mod_cache) and dynamic pages.

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  • Reducing apache VIRT and RES memory usage

    - by lisa
    On a quad-core server with 8GB of ram I have apache processes that use up to 2.3GB RES memory and 2.6GB VIRT memory. Here is a copy of the top -c command http://imgur.com/x8Lq9.png Is there a way to reduct the memory usage for these apache processes? These are my httpd.conf settings Timeout 160 TraceEnable Off ServerSignature Off ServerTokens ProductOnly FileETag None StartServers 6 <IfModule prefork.c> MinSpareServers 4 MaxSpareServers 16 </IfModule> ServerLimit 400 MaxClients 320 MaxRequestsPerChild 10000 KeepAlive On KeepAliveTimeout 4 MaxKeepAliveRequests 80

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  • Tomcat Manager Application and HTTP 404 Error

    - by David
    I am trying to set up the admin application for a Tomcat 6.0.24 instance. None of the searches I've done turn up anything I can use. I am using this configuration for Apache 2.2.14: Alias /manager /usr/share/tomcat6-admin/manager <Directory "/usr/share/tomcat6-admin/manager"> Options Indexes FollowSymLinks AllowOverride None allow from all </Directory> ProxyPass /manager ajp://localhost:8009/manager In the tomcat-users.xml I have this: <tomcat-users> <role rolename="tomcat"/> <role rolename="admin"/> <role rolename="operator"/> <role rolename="manager"/> <user username="admin" password="nopasswordforyou" roles="admin,tomcat,manager"/> <user username="operator" password="nevermind" roles="operator"/> </tomcat-users> I found the docs that suggested I needed manager-gui role installed and defined, but that appears to be Tomcat 7, not Tomcat 6. The manager.xml is the default provided with Ubuntu Lucid Lynx 10.04: <Context path="/manager" docBase="/usr/share/tomcat6-admin/manager" antiResourceLocking="false" privileged="true" /> If I access /manager from a web browser, I get a 404 error from Tomcat: "requested resource not available." If I access /manager/images I get the same thing. If I access /manager/401.jsp I get the actual page. In addition, the server.xml has not only the usual Realm (UserDatabaseRealm) but also one for MySQL authentication (JDBCRealm). Investigating this showed that the role of manager was not present there for the user admin; I fixed that by doing: INSERT USER_ROLE_DB SET USER_NAME='admin', ROLE_NAME='manager'; I restarted Tomcat, although I suspect that was overkill. No change. I don't see any errors in catalina.out or in localhost.* log files. What am I missing? What is the interaction between the different realms? How do I get the manager application working?

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  • Apache 301 redirection from one domain to another

    - by Sebastien Lachance
    I'm trying to set a redirection in my VirtualHost configuration for my website. So far I am able to redirect non www trafficto the www address like this : <VirtualHost: *:80> ServerAlias www.gcbeauce.com RewriteEngine on RewriteCond %{HTTP_HOST} ^guidedescommercesdebeauce\.com$ [NC] RewriteRule ^(.*)$ http://www.guidedescommercesdebeauce.com$1 [R=301,L] But what I also want is to redirect the old domain to this new one. I have tried adding : RewriteEngine on RewriteCond %{HTTP_HOST} ^guidedescommercesdebeauce\.com$ [NC] RewriteCond %{HTTP_HOST} ^gcbeauce\.com$ [NC] RewriteRule ^(.*)$ http://www.guidedescommercesdebeauce.com$1 [R=301,L] But nothing happens. Am I missing something here?

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  • Experience in migrating from Apache to nginx?

    - by Julien
    I'd like to get some feedback about a migration From Apache to nginx. My goal is to reduce the memory footprint of the web server. Currently, I use the following modules.features on Apache: multiple virtual hosts Server Side Include Fast CGI Please share your experience: problems during migration, benefits after migration (was it worth it?), useful modules for nginx, etc.

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  • Intermittent 400 bad request header field is missing ':' with Apache and SSL

    - by David Tinker
    Apache is returning rare intermittent 400 "bad request header field is missing ':' olhuaqv3o1t29flvr0 (random string)" errors. This seems to be related to https access and happens from Firefox, IE, Chrome etc. I am using a certificate from rapidssl. Apache/2.2.14 (Ubuntu) DAV/2 SVN/1.6.6 mod_jk/1.2.28 PHP/5.3.2-1ubuntu4.5 with Suhosin-Patch mod_ssl/2.2.14 OpenSSL/0.9.8k Anyone know how to fix this?

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  • Enabled Apache mod_status but server-status was not found on SUSE enterprise 11 SP1

    - by Charles Yeung
    In /etc/apache2/httpd.conf, I have remove the line of Include mod_status and add the following to the last line, LoadModule status_module /usr/lib/apache2/mod_status.so ExtendedStatus On <Location /server-status> SetHandler server-status AllowOverride None Order Deny,Allow Deny from all Allow from all </Location> Then I restart Apache, and go to http://HOSTNAME/server-status, but I get the page not found, Did someone know why I get page not found? Is there any more step needed to do to see the Apache status? Thanks

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  • Linux,Apache,NetBeans,PHP == Windows,IIS/Cassini,Visual Studio,ASP.Net

    - by Neil Smith
    I've worked out how to get my linux based Netbeans PHP development machine to behave much like what happens when you create a new ASP.Net project in Visual Studio. Firstly create multiple PHP project in Netbeans,say for example mysite1 and mysite2. Next edit the apache2/sites-enabled/000-default file and add two virtualhost sections as below <VirtualHost 127.0.1.1> ServerName mysite1.localhost DocumentRoot /var/www/mysite1/ </VirtualHost> <VirtualHost 127.0.2.1> ServerName mysite2.localhost DocumentRoot /var/www/mysite2/ </VirtualHost> For each site you add, pick a different ip address similar to the above where I use the third octet to increment, next edit the etc/hosts file and add the following two lines 127.0.1.1 mysite1.localhost 127.0.2.1 mysite2.localhost Then in Netbeans, go to File->Project Properties click on 'Run Configuration' and set 'Project Url' to http://mysite1.localhost for the first project and http://mysite2.localhost for the second project. That will give you a PHP development box which develops multiple PHP projects similar to how a Visual Studio Windows based box handles multiple ASP.Net sites. Hope this helps someone :)

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  • apache tomcat with CDN

    - by user3215
    I've apache2,tomcat6 ubuntu servers running on port 80 with mod_jk setup hosting jsp pages. The developers are complaining that the pages are being rendered very slow when tried with IE browser and saying, at every refresh the images are reloading again and again which is not happening with other browsers. I'm given a hint CDNwhich I've no knowledge but I found in the google that cdn makes pages available on many server which improves the speed of the page being rendered. Anybody could tell me how could I make my pages available in cdn servers?

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  • Can I tell which installation DVD was used for my Windows XP?

    - by Den
    I have two Windows XP installation DVDs (that came from the OEM with my two laptops). I need to reinstall Windows on one of them but I'm not sure which one is which. Is there any way to tell which DVD was used for each laptop? PS. They both came from the same OEM and there're no distinguishing markings on the DVDs themselves. PS2. The reason for my concern is to avoid installation twice, which may invalidate license for already installed Windows XP on one laptop if I duplicate it to another.

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  • Disable SSL / TLS compression in Apache 2.2.x

    - by DevGav
    Is there a way to disable SSL/TLS Compression in Apache 2.2.x when using mod_ssl? If not, what are people doing to mitigate the effects of CRIME/BEAST in older browsers? Related Links: https://issues.apache.org/bugzilla/show_bug.cgi?id=53219 https://threatpost.com/en_us/blogs/new-attack-uses-ssltls-information-leak-hijack-https-sessions-090512 http://security.stackexchange.com/questions/19911/crime-how-to-beat-the-beast-successor

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  • password protect apache user directory using system passwords

    - by Jeff
    I have set up Apache to check user passwords using these modules: LoadModule authz_user_module modules/mod_authz_user.so LoadModule authn_file_module modules/mod_authn_file.so LoadModule auth_basic_module modules/mod_auth_basic.so However, these modules require me to manually add everyone to a new password file (which requires every user to type in their password). Is there a way to have Apache check the system passwords, so that anyone who can ssh can use the same password for web login?

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  • Restart a single apache vhost

    - by snowflake
    I've got an Apache (2) server with several virtual hosts. I currently have mysql db locks problems on one virtual host. A common and practical way to easy release those locks and unlock the site (while the dev team refactor its application to avoid the locks), is to simply restart the apache server. I'm wondering if there is a way to restart the single vhost that is in trouble. Thank you for any comments

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  • Nginx, proxy passing to Apache, and SSL

    - by Vic
    I have Nginx and Apache set up with Nginx proxy-passing everything to Apache except static resources. I have a server set up for port 80 like so: server { listen 80; server_name *.example1.com *.example2.com; [...] location ~* \.(?:ico|css|js|gif|jpe?g|png|pdf|te?xt)$ { access_log off; expires max; add_header Pragma public; add_header Cache-Control "public, must-revalidate, proxy-revalidate"; add_header Vary: Accept-Encoding; } location / { proxy_pass http://127.0.0.1:8080; include /etc/nginx/conf.d/proxy.conf; } } And since we have multiple ssl sites (with different ssl certificates) I have a server{} block for each of them like so: server { listen 443 ssl; server_name *.example1.com; [...] location ~* \.(?:ico|css|js|gif|jpe?g|png|pdf|te?xt)$ { access_log off; expires max; add_header Pragma public; add_header Cache-Control "public, must-revalidate, proxy-revalidate"; add_header Vary: Accept-Encoding; } location / { proxy_pass https://127.0.0.1:8443; include /etc/nginx/conf.d/proxy.conf; proxy_set_header X-Forwarded-Port 443; proxy_set_header X-Forwarded-Proto https; } } server { listen 443 ssl; server_name *.example2.com; [...] location ~* \.(?:ico|css|js|gif|jpe?g|png|pdf|te?xt)$ { access_log off; expires max; add_header Pragma public; add_header Cache-Control "public, must-revalidate, proxy-revalidate"; add_header Vary: Accept-Encoding; } location / { proxy_pass https://127.0.0.1:8445; include /etc/nginx/conf.d/proxy.conf; proxy_set_header X-Forwarded-Port 443; proxy_set_header X-Forwarded-Proto https; } } First of all, I think there is a very obvious problem here, which is that I'm double-encrypting everything, first at the nginx level and then again by Apache. To make everything worse, I just started using Amazon's Elastic Load Balancer, so I added the certificate to the ELB and now SSL encryption is happening three times. That's gotta be horrible for performance. What is the sane way to handle this? Should I be forwarding https on the ELB - http on nginx - http on apache? Secondly, there is so much duplication above. Is the best method to not repeat myself to put all of the static asset handling in an include file and just include it in the server?

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