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• High Apache CPU usage, but low nginx - Configured correctly?

  - by Buckers

  We've just moved a website of ours over to a brand new high-spec Linux server (1x Intel Xeon E3-1230 v2 @ 3.30GHz, 8GB DDR3 ECC, 2x 128GB SATA SSD RAID1). The server has been configured to use nginx but we're not sure if its working correctly. The site always loads very fast to us (http://www.onedirection.net), but Plesk often sends us reports that the Apache CPU usage percentage reaches high leves, yet when we look at the nginx percentage it's always very low. We've come from a Windows background so are very new to Linux, but shouldn't nginx run INSTEAD of apache? Here's a screenshot from Plesk showing the CPU usage: http://www.pixelkicks.co.uk/_download/plesk.JPG The website gets around 20,000 visitors per day, and we use W3 Total Cache to get it running as fast as possible. MySQL has been optimised well. Memory usage is only running at 2GB of the 8GB. Does this look right? How can we tell that nginx is doing most of the work? Thanks, Chris.

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• AjaxControlToolkit JavaScript is not pointing correctly on IIS7 running behind Apache mod_proxy

  - by sohum

  So here's my setup. I've got a DynDNS account since I have a dynamic IP. I have Apache listening on port 80 and IIS7 on port 8080. I don't want users to have to enter in mydyndns.dyndns.com:8080 to get to IIS7, so I've added the following code to my Apache httpd.conf file to enable a proxy/reverse proxy: <VirtualHost *:80> ProxyPass / http://localhost:8080/myASPSite/ ProxyPassReverse / http://localhost:8080/myASPSite/ ServerName myaspsite.mydomain.com </VirtualHost> I've got a CNAME record set up on my DNS so that myaspsite.mydomain.com redirects to mydyndns.dyndns.com. When I type in myaspsite.mydomain.com into my browser, everything works beautifully... mostly. IIS7 serves up the ASPX pages and visitors to the site don't know any better. A problem arises, however, when I add Ajax Control Toolkit controls into my ASPX website, because these generate JavaScript and apparently mod_proxy_html isn't geared to handle the JS URIs properly. Sure enough, when I open up the source of my ASPX page, it has script elements as follows: <script src="/myASPSite/WebResource.axd?xyz" type="text/javascript"></script> <script src="/myASPSite/ScriptResource.axd?xyz" type="text/javascript"></script> Sure enough, these scripts are attempting to be resolved at http://myaspsite.mydomain.com/myASPSite/WebResource..., which through the proxy translates to localhost:8080/myASPSite/myASPSite/.... How can I solve this problem. The couple of websites I found suggested turning on ProxyHTMLExtended but when I tried doing that, the server did not start. I'm guessing I didn't know how to do it properly. Anyone has a handy couple of config lines that I can add to my Apache conf file to get this working as I need? I'm using Apache 2.2.11. Thanks!

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• PHP + MYSQL site perfomance

  - by Diego

  I have to manage a site which wasn't developed by me. It is in PHP using a mysql database, which is located in the web server. The site, sometimes (when the visitors increase too much) stops responding, or respond too slow. I have developed some sites in PHP but never took care of the management so really don't know where to start. The server (the hard) seems to be fine, when the web stops responding the cpu is being used at about 55% and has a lot of memory. I'm not asking someone to solve this issue. I only would really like if someone could give me a few tips about where can I find logs and how should I read and interpret them. So, that way I would be able to know if its the net traffic, the database (which queries), or what. Thanks! Update: Forgot to say: it is a Windows Server 2003. Note: I've recorded about a day with Jet Profiler. I don't really understand all the information it provides but there is one query which it marks as really slow. It makes sense because it is a select with a where clause which has three like condition. Initially I didn't include this in my question because when I run the query from MySQL Query Browser it doesn't take any long. It is under 0.01 seconds.

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• Using NginX and Apache alongside for both static and dynamic files

  - by faridv

  Background: I've searched a lot and found these useful threads about using of Apache or NginX for static or dynamic files. But they are old (mostly about 1 or 2 years ago) and I think both webservers, specifically Nginx has had important changes in performance and usage. So I think take another look on these issue cannot be that bad. Nginx (for static files) and Apache (for dynamic content)? nginx better than apache for dynamic content? [closed] Apache or NGINX for PHP? Nginx as reverse proxy to Apache with only dynamic content? My question: I have a PHP web application with lots of dynamic files and lots of static contents (videos, images etc.) and it's currently running on a CentOS 6 server and Apache 2.2 since 2 months ago. In past few days, number of our site visitors have gained so fast and I just thought if this number continues to increase with current ratio, we need to change many things (web server, application, etc.) to prevent failures. Because of hardware limitations that we are facing, I thought that it's best for us to start with web server. Should I start with something else? Should I try to increase performance of my PHP application and forget about web server for now? (even if gonna take a long time!) Because of huge usage of .htaccess files (for redirection, rewrites, etc.), I think it's gonna be painful to migrate to NginX as default web server or maybe only for dynamic files. Does this mean that I can't even use Nginx as reverse proxy? I'm not sure latest stable version of NginX and PHP-FPM have a better performance over my current Apache and my limitations (too many things) won't let me to give it a try. Which one is doing better currently? What will I lose by migrating to Nginx? To make it short, what should I do?

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• JavaScript is not pointing correctly on IIS7 running behind Apache mod_proxy

  - by sohum

  So here's my setup. I've got a DynDNS account since I have a dynamic IP. I have Apache listening on port 80 and IIS7 on port 8080. I don't want users to have to enter in mydyndns.dyndns.com:8080 to get to IIS7, so I've added the following code to my Apache httpd.conf file to enable a proxy/reverse proxy: <VirtualHost *:80> ProxyPass / http://localhost:8080/myASPSite/ ProxyPassReverse / http://localhost:8080/myASPSite/ ServerName myaspsite.mydomain.com </VirtualHost> I've got a CNAME record set up on my DNS so that myaspsite.mydomain.com redirects to mydyndns.dyndns.com. When I type in myaspsite.mydomain.com into my browser, everything works beautifully... mostly. IIS7 serves up the ASPX pages and visitors to the site don't know any better. A problem arises, however, when I add Ajax Control Toolkit controls into my ASPX website, because these generate JavaScript and apparently mod_proxy_html isn't geared to handle the JS URIs properly. Sure enough, when I open up the source of my ASPX page, it has script elements as follows: <script src="/myASPSite/WebResource.axd?xyz" type="text/javascript"></script> <script src="/myASPSite/ScriptResource.axd?xyz" type="text/javascript"></script> Sure enough, these scripts are attempting to be resolved at http://myaspsite.mydomain.com/myASPSite/WebResource..., which through the proxy translates to localhost:8080/myASPSite/myASPSite/.... How can I solve this problem. The couple of websites I found suggested turning on ProxyHTMLExtended but when I tried doing that, the server did not start. I'm guessing I didn't know how to do it properly. Anyone has a handy couple of config lines that I can add to my Apache conf file to get this working as I need? I'm using Apache 2.2.11. Thanks!

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• How do I determine the cause of a sustained spike in mysql queries/activity?

  - by mattmcmanus

  So this is more of a "I'm trying to learn about how this works" question rather than "there is a serious problem I can't figure out!" question. I'm setting up a VPS and have been tweaking and changing things here and there. I recently installed munin (like two days ago) and yesterday I noticed a significant increase in mysql activity. So now my curiosity is going crazy. How do I setup/access mysql's query log? I have about 5 databases on the server so I want to see which one is getting all the action. Is there anything else I can do to keep a better eye on what's going on? Here are the graphs. As you can tell, it's not that much activity at all but I'm just curious at the change. The sites that are on the server right now do not get a lot of traffic. It's running a couple drupal sites, only one of which is live. The live one hasn't had a spike in traffic and the last spike was 250 visitors so it's barely a spike at all.

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• NOQUEUE: SYSERR(root): opendaemonsocket: daemon MTA-v4: cannot bind: Address already in use

  - by Francesco

  I have an issue with sendmail on my server (ubuntu 12.10) with php, mysql,and wordpress installed. Basically I want to create a contact form in my blog to receive emails from visitors directly into my gmail account but it doest work! I created a php file called testmail.php to recall it from the browser: <?php $to = '[email protected]'; $subbject = 'TEST MAIL'; $msg = 'test test test test test test test test test test test test test test test'; $isMailed = mail($to, $subbject, $msg, 'From:me <[email protected]>'); if($isMailed) echo 'mail has been send to: ' . $to; else echo 'mail has NOT been send..'; ?> But I dont receive anything! The /var/log/mail.log says: NOQUEUE: SYSERR(root): opendaemonsocket: daemon MTA-v4: cannot bind: Address already in use What do i do wrong? Where do I need to check? What info do you need more? I checked also into the spam folder, nothing. Thank you!

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• Different nginx rules based on referrer

  - by juana

  I'm using WordPress with WP Super Cache. I want visitors who come from Google (That inlcudes all country specific referrers like google.co.in, google.co.uk and etc.) to see uncached contents. There are my nginx rules which are not working the way I want: server { server_name website.com; location / { root /var/www/html/website.com; index index.php; if ($http_referer ~* (www.google.com|www.google.co) ) { rewrite . /index.php break; } if (-f $request_filename) { break; } set $supercache_file ''; set $supercache_uri $request_uri; if ($request_method = POST) { set $supercache_uri ''; } if ($query_string) { set $supercache_uri ''; } if ($http_cookie ~* "comment_author_|wordpress|wp-postpass_" ) { set $supercache_uri ''; } if ($supercache_uri ~ ^(.+)$) { set $supercache_file /wp-content/cache/supercache/$http_host/$1index.html; } if (-f $document_root$supercache_file) { rewrite ^(.*)$ $supercache_file break; } if (!-e $request_filename) { rewrite . /index.php last; } } location ~ \.php$ { fastcgi_pass 127.0.0.1:9000; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME /var/www/html/website.com$fastcgi_script_name; include fastcgi_params; } } What should I do to achieve my goal?

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• .htm pages working but .aspx pages throwing errors

  - by Mike

  Our site has thousands of visitors per day but we've been receiving reports from some of our members that they are able to hit our main page, presumably because it's a .htm page, but when they click off to a .aspx page, they get an error. I've done as much research as I know how and here is what I have come up with: - We have not made any changes to IIS on our server in months. - We have a couple of customers that have been willing to work with us and provide information about their system. One customer is running Vista, the other is running XP. - We had one of the customers test both Firefox and MSIE. She gets same error in both. - One customer said, "We were able to post the profile and searched on available jobs and it worked w/ Firefox for a day, then it just quit working...we did not change any settings to Firefox after we posted the profile." - We asked the customer to clear their cache and try again. They responded with, "We just cleared the cache and got the same error; btw, I periodically clear the cache -- almost every day." Summary We have thousands of customers that hit our site with no problem. We can't reproduce these errors. These customers are getting the same error in different browsers. They are only getting the error on .aspx pages. They still get the error after clearing their cache. We would appreciate any thoughts on what other questions we could ask these customers or thoughts on how we can further troubleshoot this problem.

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• How can I avoid an error in this .htaccess file?

  - by mipadi

  I have a blog. The blog is stored under the /blog/ prefix on my website. It has the usual URLs for a blog, so articles have URLs in the format /blog/:year/:month/:day/:title/. First and foremost, I want to automatically redirect visitors to the www subdomain (in case they leave that off), and internally rewrite the root URL to /blog/, so that the front page of the blog appears on the front page of the site. I have accomplished that with the following set of rewrite rules in my .htaccess file: RewriteEngine On # Rewrite monkey-robot.com to www.monkey-robot.com RewriteCond %{HTTP_HOST} ^monkey-robot\.com$ RewriteRule ^(.*)$ http://www.monkey-robot.com/$1 [R=301,L] RewriteRule ^$ /blog/ [L] RewriteRule ^feeds/blog/?$ /feeds/blog/atom.xml [L] That works fine. The problem is that the front page of the blog now appears at two distinct URLs: / and /blog/. So I'd like to redirect the /blog/ URL to the root URL. Initially I tried to accomplish this with the following set of rewrite rules: RewriteEngine On # Rewrite monkey-robot.com to www.monkey-robot.com RewriteCond %{HTTP_HOST} ^monkey-robot\.com$ RewriteRule ^(.*)$ http://www.monkey-robot.com/$1 [R=301,L] RewriteRule ^$ /blog/ [L] RewriteRule ^blog/?$ / [R,L] RewriteRule ^feeds/blog/?$ /feeds/blog/atom.xml [L] But that gave me an infinite redirect (maybe because of the preceding rule?). So then I tried this set: RewriteEngine On # Rewrite monkey-robot.com to www.monkey-robot.com RewriteCond %{HTTP_HOST} ^monkey-robot\.com$ RewriteRule ^(.*)$ http://www.monkey-robot.com/$1 [R=301,L] RewriteRule ^$ /blog/ [L] RewriteRule ^blog/?$ http://www.monkey-robot.com/ [R,L] RewriteRule ^feeds/blog/?$ /feeds/blog/atom.xml [L] But I got a 500 Internal Server Error with the following log message: Invalid command '[R,L]', perhaps misspelled or defined by a module not included in the server configuration What gives? I don't think [R,L] is a syntax error.

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• What is Best storage servers infrastructure ? DAS/NAS/SAN or installing GlusterFS/LUSTER/HDFS/RBDB

  - by TORr0t

  I am trying to design an infrastucture for the project I am working on. It would be somehow a file-sharing/downloading project (like rapidshare) and I would need high storage sizes and good scability, and I would add new storage nodes after my project grows up. I have come up with 3 solutions for my project which are using Luster, GlusterFS, HDFS, RDBD. For start, i would have 2 servers, one server is for glusterfs client + webserver + db server+ a streaming server, and the other server is gluster storage node. (After sometime, i would be adding more node servers, and client servers (dont know how many new client new servers to add, will see later) So, i am thinking to work with glusterfs. But i really wonder that if i have to use high performance servers with high sotrage sizes or avarage/slow servers with high storage sizes? Or nas/das/san solutions are better for glusterfs storage nodes? I might buy a nas and install glusterfs onto it. I would be happy to listen to your recommendations for the server properties (for each clients and nodes) . I really dont know if I really need high amount of ram and good cpus to for the nodes. I am sure i need it for client servers. The files would be streamed as well, so the Automatic file replication is important, thus, my system should work like a cloud, when needed, according to high traffic, the storage nodes should copy the most demanded file to be streamed and would help me to get rid of scability problems and my visitors would able to stream/download those files. Also, i am open to your experiences/thoughts about any good solution. Luster, hdfs, rbdb are the other options and i would be happy to listen to your thoughts here. I would be very very happy to hear back from anyone commented of any words I have used here. Thanks

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• Issue with SSL using HAProxy and Nginx

  - by Ben Chiappetta

  I'm building a highly available site using a multiple HAProxy load balancers, Nginx web serves, and MySQL servers. The site needs to be able to survive load balancer or web servers nodes going offline without any interruption of service to visitors. Currently, I have two boxes running HAProxy sharing a virtual IP using keepalived, which forward to two web servers running Nginx, which then tie into two MySQL boxes using MySQL replication and sharing a virtual IP using heartbeat. Everything is working correctly except for SSL traffic over HAProxy. I'm running version 1.5 dev12 with openssl support compiled in. When I try to navigate to the virtual IP for haproxy over https, I get the message: The plain HTTP request was sent to HTTPS port. Here's my haproxy.cfg so far, which was mainly assembled from other posts: global log 127.0.0.1 local0 log 127.0.0.1 local1 notice # log 127.0.0.1 local0 user haproxy group haproxy daemon maxconn 20000 defaults log global option dontlognull balance leastconn clitimeout 60000 srvtimeout 60000 contimeout 5000 retries 3 option redispatch listen front bind :80 bind :443 ssl crt /etc/pki/tls/certs/cert.pem mode http option http-server-close option forwardfor reqadd X-Forwarded-Proto:\ https if { is_ssl } reqadd X-Proto:\ SSL if { is_ssl } server web01 192.168.25.34 check inter 1s server web02 192.168.25.32 check inter 1s stats enable stats uri /stats stats realm HAProxy\ Statistics stats auth admin:********* Any idea why SSL traffic isn't being passed correctly? Also, any other changes you would recommend? I still need to configure logging, so don't worry about that section. Thanks in advance your help.

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• Removing forward lookup zone broke our site - why?

  - by user102469

  I'm fairly new to the job and trying to get to grips with the infrastructure here. We've moved a site from being locally hosted on our own network to an external host (1&1). I've transferred the DNS hosting from the previous DNS host to 1&1 to keep things simple. Once everything had gone through, visitors that were external to our network were being directed to the new site on 1&1 but requests from within our network were still going to our own server. I noticed in the DNS server that there was a forward lookup zone for the site pointing to our own server still. My (admittedly simplistic) understanding was that pausing that zone would then cause the DNS server to get the address for the site from our external DNS servers and our users would start landing on our new site. However, what happened instead was that they were being met with "page not found" type errors. I've resolved it my modifying the forward lookup zone A record to point to the external web server but would like to get an understanding as to why pausing the zone didn't work. Would deleting the zone work? I am reluctant to try that as creating it again will not be as easy as simply pressing "start". Many thanks.

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• 403.4 won't redirect in IE7

  - by Jeremy Morgan

  I have a secured folder that requires SSL. I have set it up in IIS(6) to require SSL. We don't want the visitors to be greeted with the "must be secure connection" error, so I have modified the 403.4 error page to contain the following: function redirectToHttps() { var httpURL = window.location.hostname+window.location.pathname; var httpsURL = "https://" + httpURL ; window.location = httpsURL ; } redirectToHttps(); And this solution works great for every browser, but IE7. On any other browser, if you type in http://www.mysite.com/securedfolder it will automatically redirect you to https://www.mysite.com/securedfolder with no message or anything (the intended action). But in Internet Explorer 7 ONLY it will bring up a page that says The website declined to show this webpage Most Likely Causes: This website requires you to log in This is something we don't want of course. I have verified that javascript is enabled, and the security settings have no effect, even when I set them to the lowest level I get the same error. I'm wondering, has anyone else seen this before?

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• apache performance timing out

  - by Mike

  Im running a webserver where I'm hosting about 6-7 websites. Most of these websites get their content from MySQL which is hosted on the same server. Traffic average per day is about 500-600 unique visitors, about 150K hits per week. But for some reason sometimes websites send a timeout, OR sometimes websites dont load all images. I know that I should perhaps separate static content from dynamic content, but for now I think that's not a possibility. I would appreciate any suggestions on how could I improve the performance of apache, so it doesn't keep timing out. Server is running on Sempron LE 1300; 2.3GHz,512K Cache 2GB RAM 10Mbps/1Mbps Services: MySQL, ProFTPD, Apache. Private + Shared = RAM used Program ---------------------------------------------------- 1.2 MiB + 54.0 KiB = 1.2 MiB proftpd 4.1 MiB + 23.0 KiB = 4.1 MiB munin-node 20.8 MiB + 120.5 KiB = 20.9 MiB mysqld 47.3 MiB + 9.9 MiB = 57.3 MiB apache2 (22) top: Mem: 2075356k total, 1826196k used, 249160k free, Timeout 35 KeepAlive On MaxKeepAliveRequests 300 KeepAliveTimeout 5 <IfModule mpm_prefork_module> StartServers 10 MinSpareServers 20 MaxSpareServers 20 MaxClients 60 MaxRequestsPerChild 1000 </IfModule> <IfModule mpm_worker_module> StartServers 2 MaxClients 150 MinSpareThreads 25 MaxSpareThreads 75 ThreadsPerChild 25 MaxRequestsPerChild 0 </IfModule>

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• Microsoft Windows DHCP: Steering IPv4 clients into specific scopes based on MAC

  - by Easter Sunshine

  We have visitors on our campus who bring their own laptops and devices and use our wireless and wired networks. When we receive a copyright infringement notice (typically BitTorrenting), we are required to quarantine that MAC address so that it no longer has Internet access. No matter what website it tries to visit, it is sent to a web page explaining to the user that the device has been quarantined. We have thus far implemented this in ISC DHCP on Linux. We have multiple VLANs with one or more public-IP subnets and one RFC1918 quarantine subnet each. All clients are leased IPs in the public-IP subnet(s) unless you're in a list of known bad MACs. Then, you are sent to the quarantine subnet so that your traffic is unroutable on the Internet (you are isolated by subnet only, not by VLAN). We would like to move to Windows DHCP in light of the IPAM role but I cannot figure out how to replicate this in Windows DHCP 2012 (Assign DHCP IPs for specific MAC prefixes on Windows Server 2008 R2 suggests it was not possible in 2008 R2), even while using policies. So here's what I'd like: The administrator/help desk provides and maintains a list of MAC addresses that are to be quarantined. The DHCP server places those MACs into the quarantine subnet on the respective VLAN, no matter which VLAN the client is in. I don't think reservations would work: We currently have about 300 registered bad MACs and about 12 VLANs. I don't want to make 300 x 12 reservations nor have to add 12 reservations per new MAC address. Not to mention all of the quarantine subnets are /24s. We do not have NPS/NAC. You do not have to register your MAC address get network access. We use Cisco routers/switches. Thanks.

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• Forward real IP through Haproxy => Nginx => Unicorn

  - by Hendrik

  How do I forward the real visitors ip adress to Unicorn? The current setup is: Haproxy => Nginx => Unicorn How can I forward the real IP address from Haproxy, to Nginx, to Unicorn? Currently it is always only 127.0.0.1 I read that the X headers are going to be depreceated. http://tools.ietf.org/html/rfc6648 - how will this impact us? Haproxy Config: # haproxy config defaults log global mode http option httplog option dontlognull option httpclose retries 3 option redispatch maxconn 2000 contimeout 5000 clitimeout 50000 srvtimeout 50000 # Rails Backend backend deployer-production reqrep ^([^\ ]*)\ /api/(.*) \1\ /\2 balance roundrobin server deployer-production localhost:9000 check Nginx Config: upstream unicorn-production { server unix:/tmp/unicorn.ordify-backend-production.sock fail_timeout=0; } server { listen 9000 default; server_name manager.ordify.localhost; root /home/deployer/apps/ordify-backend-production/current/public; access_log /var/log/nginx/ordify-backend-production_access.log; rewrite_log on; try_files $uri/index.html $uri @unicorn; location @unicorn { proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $http_host; proxy_set_header X-Real-IP $remote_addr; proxy_redirect off; proxy_pass http://unicorn-production; proxy_connect_timeout 90; proxy_send_timeout 90; proxy_read_timeout 90; } error_page 500 502 503 504 /500.html; client_max_body_size 4G; keepalive_timeout 10; }

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• illegitimate traffic from user agent Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.10) Gecko/2009042316 Firefox/3.0.10 (.NET CLR 3.5.30729)

  - by user114293

  Since the beginning of the year, I'm getting a lot of traffic with the user agent Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.10) Gecko/2009042316 Firefox/3.0.10 (.NET CLR 3.5.30729). My access logs show 40% - 60% from that user agent. That's strange because the user agent states a Firefox 3.0.10 browser (is anybody using that browser in 2012? Definitely not 40%-60% of visitors on a normal website). Also, the logs show that this user agent only requested the HTML document and no referenced assets like images, css, js files. I checked the IPs of those requests (with that UA). It's coming from all over the world. I recognized that those IPs sometimes have a mobile user agent. So my suspicion is a mobile app that is doing a lot of "spider requests" - but if that would be the case than other web sites should have the same problem. That's actually my question: Does anybody experience same/similar problems?

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• How to handle sh: fetch: command not found

  - by Tyler Johnson

  Okay, I'm a noobie. I know how to build and compose a website, but I have no idea what I'm doing when it comes to servers and server commands, etc. I've recently had a problem with all of my sites on our servers going down all at once and then I have to go in and reboot the server for them to come up again. At first this was annoying, but now it is becoming agonizing as it now takes 3-4 reboots for the websites to come back up. I contacted support for my hosting, but they are not being very helpful. They just keep telling me what the issue might be and basically telling me that I'm going to have to look into it and figure it out, which really isn't possible since I know nothing. Anyway, here are the things they said were possible reasons: They said I have "strange logs" in my Apache webserver log, error: sh: fetch: command not found. My php.ini memory limit is: 256M which is very high. It should be 32M or 64M. Server is reaching Max Clients, meaning we have more than 150 visitors at a time. (They supposedly "fixed" this, but the sites/server are still going down) I have some Wordpress sites with plugins getting errors like: PHP Warning: pack(): Type H: illegal hex digit G in... PHP Fatal error: Cannot use object of type stdClass as array in... PHP Fatal error: Maximum execution time of 30 seconds exceeded in... PHP Fatal error: Call to undefined function file_exists() in... PHP Parse error: syntax error, unexpected '<' I know that's a lot, but I really am at wits end and have no idea what to do now. If anyone could maybe give me some advice or point me in the right direction I would greatly appreciate it! Thanks! Oh, and here are the specs for my server: RAM: 2048MB CPU Shares: 40 Primary Disk: 50GB Data Transfer: 75GB Port Speed: 5Mbps

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• Redirect 301 fails with a path as destination

  - by Martijn Heemels

  I'm using a large number of Redirect 301's which are suddenly failing on a new webserver. We're in pre-production tests on the new webserver, prior to migrating the sites, but some sites are failing with 500 Internal Server Error. The content, both databases and files, are mirrored from the old to the new server, so we can test if all sites work properly. I traced this problem to mod_alias' Redirect statement, which is used from .htaccess to redirect visitors and search engines from old content to new pages. Apparently the Apache server requires the destination to be a full url, including protocol and hostname. Redirect 301 /directory/ /target/ # Not Valid Redirect 301 /main.html / # Not Valid Redirect 301 /directory/ http://www.example.com/target/ # Valid Redirect 301 /main.html http://www.example.com/ # Valid This contradicts the Apache documentation for Apache 2.2, which states: The new URL should be an absolute URL beginning with a scheme and hostname, but a URL-path beginning with a slash may also be used, in which case the scheme and hostname of the current server will be added. Of course I verified that we're using Apache 2.2 on both the old and the new server. The old server is a Gentoo box with Apache 2.2.11, while the new one is a RHEL 5 box with Apache 2.2.3. The workaround would be to change all paths to full URL's, or to convert the statements to mod_rewrite rules, but I'd prefer the documented behaviour. What are your experiences?

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• A lots of Apache processes are using my CPU uses always more than 70%

  - by Barkat Ullah

  I am running a plesk panel in 1and1. I have 120 sites running and all are using pligg cms, each site has 600 visitors per day. Please see the details of my server below: HDD-1000GB RAM-16GB Processor-6 Core I always see a lot of apache processes running in my # top view, so the server seems overloaded. If I can reduce the amount apache processes I think the server will be ok. But I don't know why too many apache processes are running. Please see the link below for the screenshot of my # top view: http://dl.dropbox.com/u/26967109/%23Top-2.jpg Sometimes I saw too many connection error in my plesk control panel, so I added the below line in my [mysqld] section: set-variable=max_connections=416 But I didn't find a solution yet. I have also added maxclients and serverlimit 416 in the config /etc/httpd/conf/httpd.conf But no solution yet. I am researching around more than 7 days but don't get any solution. Please help me to solve the problem. In peak hours my sites are taking too much time to load, but off-peak hour it is ok. Please help me to find out the actual problem.

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• Setting the default permissions for files uploaded via FTP to a directory

  - by Kerri

  Disclaimer: I'm just a web designer/coder, and server admin stuff is my weakest point of them all. So be easy on me (and very specific). I'm using a simple CMS (Unify) on a site, where part of the functionality is that the client can upload files to a specified directory (using FTP). The permissions for the upload directory are set to 755. But when files are uploaded through the interface, they are uploaded with permissions set to 640 (instead of 644), so site visitors cannot acces the files. When I emailed the CMS's support about this, they told me that it was a server setting, and I need to make sure that files uploaded through FTP are set to 644. Makes perfect sense, but I have no idea how to do this. Any help would be greatly appreciated. This site is a shared site hosted by Network Solutions (Unix), so my access options are limited. I can edit .htaccess files, and php.ini, but that's about all I have access to. It appears I can't even log on via shell. ETA: 11/11/2010 Thanks all. I was able to work around this problem by setting up the CMS's settings in a different way. I'd be interested in following up on Nick O'Niel's suggestions, because I think he's on the right track, but unfortunately I can't access the necessary files on this particular server. So, anyway, I'm leaving this open, since the original questions isn't exactly resolved. Unfortunately, I probably can't put a correct answer to the test, since the shared server in question has nearly all of its config files tightly locked down.

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• How should I configure nginx caching headers for a "baked" static file blog? (Octopress)

  - by Doug Stephen

  I recently deployed an Octopress blog (which is a blogging platform built around Jekyll). It's a static-site blog generator, with no dynamic content or databases to muck about with. It's being served up by nginx. My question is, what is the appropriate expires directive or Cache-Control header that I should set to make sure that visitors get the most up-to-date version of the site when they visit without having to manually refresh? Since the site is just .html files it seems to get cached pretty aggressively. I've tried a million different combinations of expires modified + xxxx and even straight up expires off but I can't seem to wrap my head around it. I'm very new to dealing with caching like this, specifically, on static files that change frequently, and obviously if the site hasn't been changed then I'd like for it to be served up out of the cache. Update (still not solved though): I found open_file_cache, tweaked that. Still no dice. It seems like what I might want to do is use nginx as a proxy cache and use Apache with ETags? Is there really no convenient way to make nginx play nicer with conditional requests from the client? TL;DR: I'm running a static-file blog and I'd like to set up nginx to only serve from the cache if the blog hasn't been updated recently, but I'm too stupid to figure it out myself because I'm relatively new to web servers.

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• How Do I Stop NFS Clients from Using All of the NFS Server's Resources?

  - by Ken S.

  I have a v4 NFS server running on Ubuntu 12.04LTS. It is the main repository for the web assets that four external nginx webservers mount to serve up to site visitors. These client servers connect to it via a read-only mount. Each of these RO servers has this displayed when I check the mounts: 10.0.0.90:/assets on /var/www/assets type nfs4 (ro,addr=10.0.0.90,clientaddr=0.0.0.0) The NFS master's /etc/exports file contains entries like this for each server: /mnt/lvm-ext4 10.0.0.40(ro,fsid=0,insecure,no_subtree_check,async) The problem that I'm seeing is that these clients are eventually utilizing all the RAM on the NFS server and causing it to crash. If I do a watch free -m I can watch the used memory creep up until it's used and then see the free buffers/cache entry creep down to near zero before the server eventually locks up requiring a reboot. There is some sort of memory leak somewhere that is causing this, and the optimal solution would be to find it and fix it, but in the meantime I need to find a way to have the NFS server protect itself from connected clients using all it's RAM. There must be some sort of setting that limits the resources the clients can use, but I can't seem to find it. I've tried adjusting the values for rsize and wsize but they don't seem to help or be related. Thanks for any tips.

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• Varnish with multiple sites/boxes

  - by jerhinesmith

  Is it possible for Varnish to redirect traffic to different IPs based on the url? For example, is the following setup feasible (and if so, what would the VCL look like): *.example.com points to Varnish IP address When a request is made to foo.example.com, varnish checks the cache and sends the request to Server1's IP address on a cache miss. When a request is made to bar.example.com, varnish checks the cache and sends the request to Server2's IP address on a cache miss. foo and bar are (for the most part) completely unrelated sites. They use the engine, but have different content and their own distinct database. Since there previously was no penalty for doing so (other than cost) we split them up into two separate boxes so that a ton of traffic to foo won't have a negative impact on visitors browsing around bar. I could set up two instances of varnish and have one serve up foo's static content and the other serve up bar's, but as there doesn't seem to be much overhead to running Varnish, I think (perhaps mistakenly) that it would make more sense to go with one Varnish server that redirects the traffic to the appropriate box on a cache miss.

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