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• Apache is spawning more and more processes!!

  - by erotsppa

  We have a LAMP setup that is working prety good for half a year. All of a sudden today the apache server (mysql servers are not on this box) started to die. It seems to have started to spawn more and more processes over time. Eventually it will consume all the memory and the server would just die. We are using prefork. In the mean time what we are doing is just added more ram and increased the MaxClients and ServerLimit parameter to 512. We're just prolonging the crash. The number still goes up slowly. Maybe in a day, it would reach that limit. What is going on? We only have around 15-20 request per second. We have 1Gb memory and it's not half used, there's no swapping going on. Why is apache creating more and more processes? It's almost like theres a leak somewhere! The database boxes are fine, they are not causing a delay to requests. We tested some queries everything is quick!

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• Dynamic fowarding with SOCKS5 proxy [on hold]

  - by bh3244

  I'm building my own SOCKS5 client and HTTP library and am having trouble figuring out how things work with dynamic port forwarding. So far I can connect successfully with my SOCKS5 client, but from there on I am stuck. I am using the ssh -D command. Considering I have my local machine "home" and my server "server" and I wanted to use "server" as proxy for all connections I understand I would type ssh -D "localport" "serverhostname" on my local machine "home". This command I understand has ssh accept connections with the SOCKS5 protocol. So now if I want to connect to google.com(74.125.224.72:80) and issue a GET for the front page, I assume I would send the SOCKS5 client request and the server would respond back with a 0x00 "succeeded" and from then on I am connected and I would send the HTTP GET request and the server would respond back accordingly with the data. Now if I want to navigate to a different website, must I issue another SOCKS5 connection request for that sites IP/hostname? I'm confused if this is the way it is done, or if there is a program listening on the local port of the "server" and handling outgoing and incoming data. To reiterate: Do SOCKS5 proxies work by sending repeated SOCKS5 connection requests for different addresses or is there just one connection to a local port on "server" and another program on "server" handles the outgoing connection to the internet by using that local port to send and receive data to/from "home"?

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• OSX 10.6 goes unresponsive

  - by mjb

  This behavior continues to perplex me. My MBP, running 10.6.7, stops responding to all Apple-based software. Whatever software I have open remains open (Terminal, iTunes, Safari), but if I try to use the F-shortcuts or launch any OSX-based software not already open (System Preferences for example) it just bounces in the dock then never launches. I also cannot reboot without hard rebooting. I left terminal open, so I see the following in /var/log/system.log Jun 25 19:39:02 mjb-2 com.apple.ReportCrash.Root[59432]: 2011-06-25 19:39:02.585 ReportCrash[59432:7f1f] Saved crash report for CoreServicesUIAgent[59576] version ??? (???) to /Library/Logs/DiagnosticReports/CoreServicesUIAgent_2011-06-25-193902_localhost.crash Jun 25 19:39:02 mjb-2 com.apple.ReportCrash.Root[59432]: 2011-06-25 19:39:02.586 ReportCrash[59432:b10f] Saved crash report for quicklookd[59571] version ??? (???) to /Library/Logs/DiagnosticReports/quicklookd_2011-06-25-193902_localhost.crash Two requests: (1) please don't send this off to the Apple area so it can die a slow painful rotting death of tumbleweed. (2) Suggest what I should kill -9 or logs to look at to cut this sh*$ out. Cheers, mjb

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• Apache: How to redirect OPTIONS request with .htaccess?

  - by Milan Babuškov

  I have Apache 2.2.4 server with a lot of messages like this in the access_log: ::1 - - [15/May/2010:19:55:01 +0200] "OPTIONS * HTTP/1.0" 400 543 ::1 - - [15/May/2010:20:22:17 +0200] "OPTIONS * HTTP/1.0" 400 543 ::1 - - [15/May/2010:20:24:58 +0200] "OPTIONS * HTTP/1.0" 400 543 ::1 - - [15/May/2010:20:25:55 +0200] "OPTIONS * HTTP/1.0" 400 543 ::1 - - [15/May/2010:20:27:14 +0200] "OPTIONS * HTTP/1.0" 400 543 These are the "internal dummy connections" as explained on this page: http://wiki.apache.org/httpd/InternalDummyConnection The page also hits my main problem: "In 2.2.6 and earlier, in certain configurations, these requests may hit a heavy-weight dynamic web page and cause unnecessary load on the server. You can avoid this by using mod_rewrite to respond with a redirect when accessed with that specific User-Agent or IP address." Well, obviously I cannot use UserAgent because I minimized the server signature, but I could use IP address. However, I don't have a clue what should the RewriteCond and RewriteRule look for IPv6 address ::1. The website where this runs is using CodeIgniter, so there is already the following .htaccess in place, I just need to add to it: RewriteEngine on RewriteCond %{REQUEST_URI} ^/system.* RewriteRule ^(.*)$ /index.php?/$1 [G] RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^(.*)$ /index.php?/$1 [L] Any idea how to write this .htaccess rule?

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• GRE Tunnel over IPsec with Loopback

  - by Alek

  Hello, I'm having a really hard time trying to estabilish a VPN connection using a GRE over IPsec tunnel. The problem is that it involves some sort of "loopback" connection which I don't understand -- let alone be able to configure --, and the only help I could find is related to configuring Cisco routers. My network is composed of a router and a single host running Debian Linux. My task is to create a GRE tunnel over an IPsec infrastructure, which is particularly intended to route multicast traffic between my network, which I am allowed to configure, and a remote network, for which I only bear a form containing some setup information (IP addresses and phase information for IPsec). For now it suffices to estabilish a communication between this single host and the remote network, but in the future it will be desirable for the traffic to be routed to other machines on my network. As I said this GRE tunnel involves a "loopback" connection which I have no idea of how to configure. From my previous understanding, a loopback connection is simply a local pseudo-device used mostly for testing purposes, but in this context it might be something more specific that I do not have the knowledge of. I have managed to properly estabilish the IPsec communication using racoon and ipsec-tools, and I believe I'm familiar with the creation of tunnels and addition of addresses to interfaces using ip, so the focus is on the GRE step. The worst part is that the remote peers do not respond to ping requests and the debugging of the general setup is very difficult due to the encrypted nature of the traffic. There are two pairs of IP addresses involved: one pair for the GRE tunnel peer-to-peer connection and one pair for the "loopback" part. There is also an IP range involved, which is supposed to be the final IP addresses for the hosts inside the VPN. My question is: how (or if) can this setup be done? Do I need some special software or another daemon, or does the Linux kernel handle every aspect of the GRE/IPsec tunneling? Please inform me if any extra information could be useful. Any help is greatly appreciated.

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• Proxying from nginx to Jetty

  - by newbie

  I'm proxying request from nginx to Jetty, but I have problem with request that Jetty receives. Jetty requests shows that request IP address is 127.0.0.1. But I want real server IP and my site has multiple domains, so when request is coming from some domain name to my server, it must available in Jetty request too. nginx config: server { listen 80; ## listen for ipv4 listen [::]:80 default ipv6only=on; ## listen for ipv6 server_name localhost; access_log /var/log/nginx/localhost.access.log; location / { proxy_pass http://127.0.0.1:8080; proxy_set_header X-Real-IP $remote_addr; } } Servlet request: Dump Servlet getMethod: GET getContentLength: -1 getContentType: null getRequestURI: /dump/info getRequestURL: http://127.0.0.1:8080/dump/info getContextPath: getServletPath: /dump getPathInfo: /info getPathTranslated: /tmp/jetty-0.0.0.0-8080-test.war-_-any-/webapp/info getQueryString: null getProtocol: HTTP/1.0 getScheme: http getServerName: 127.0.0.1 getServerPort: 8080 getLocalName: 127.0.0.1 getLocalAddr: 127.0.0.1 getLocalPort: 8080 getRemoteUser: null getUserPrincipal: null getRemoteAddr: 127.0.0.1 getRemoteHost: 127.0.0.1 getRemotePort: 50905 getRequestedSessionId: 6ubs42zhm5q61k5hm84ni3ib isSecure(): false isUserInRole(admin): false getLocale: en_US getLocales: en_US getLocales: en

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• Force local IP traffic to an external interface

  - by calandoa

  I have a machine with several interfaces that I can configure as I want, for instance: eth1: 192.168.1.1 eth2: 192.168.2.2 I would like to forward all the traffic sent to one of these local addresses through the other interface. For instance, all requests to an iperf, ftp, http server at 192.168.1.1 should be not just routed internally, but forwarded through eth2 (and the external network will take care of re-routing the packet to eth1). I tried and looked at several commands, like iptables, ip route, etc... but nothing worked. The closest behavior I could get was done with: ip route change to 192.168.1.1/24 dev eth2 which send all 192.168.1.x on eth2, except for 192.168.1.1 which is still routed internally. May be I could then do NAT forwarding of all traffic directed to fake 192.168.1.2 on eth1, rerouted to 192.168.1.1 internally? I am actually struggling with iptables, but it is too tough for me. The goal of this setup is to do interface driver testing without using two PCs. I am using Linux, but if you know how to do that with Windows, I'll buy it!

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• Linux Tuning for High Traffic JBoss Server with LDAP Binds

  - by Levi Stanley

  I'm configuring a high traffic Linux server (RedHat) and running into a limit I haven't been able to track down. I need to be able to handle sustained 300 requests per second throughput using Nginx and JBoss. The point of this server is to run checks on a user's account when that user signs in. Each request goes through Nginx to JBoss (specifically Torquebox with JBoss A7 with a Sinatra app) and then makes an LDAP request to bind that user and retrieve several attributes. It is during the bind that these errors occur. I'm able to reproduce this going directly to JBoss, so that rules out Nginx at least. I get a variety of error messages, though oddly JBoss stopped writing to the log file recently. It used to report errors about creating native threads. Now I just see "java.net.SocketException: Connection reset" and "org.apache.http.conn.HttpHostConnectException: Connection to http://my.awesome.server:8080 refused" as responses in jmeter. To the best of my knowledge, I have plenty of available file handles, processes, sockets, and ports, yet the issue persists. Unfortunately, I have very little experience tuning servers. I've found a couple useful documents - Ipsysctl tutorial 1.0.4 and Linux Tuning - but those documents are a bit over my head (and just entering the the configuration described in Linux Tuning doesn't fix my issue. Here are the configuration changes I've tried (webproxy is the user that runs Nginx and JBoss): /etc/security/limits.conf webproxy soft nofile 65536 webproxy hard nofile 65536 webproxy soft nproc 65536 webproxy hard nproc 65536 root soft nofile 65536 root hard nofile 65536 root soft nproc 65536 root hard nofile 65536 First attempt /etc/sysctl.conf sysctl net.core.somaxconn = 8192 sysctl net.ipv4.ip_local_port_range = 32768 65535 sysctl net.ipv4.tcp_fin_timeout = 15 sysctl net.ipv4.tcp_keepalive_time = 1800 sysctl net.ipv4.tcp_keepalive_intvl = 35 sysctl net.ipv4.tcp_tw_recycle = 1 sysctl net.ipv4.tcp_tw_reuse = 1 Second attempt /etc/sysctl.conf net.core.rmem_max = 16777216 net.core.wmem_max = 16777216 net.ipv4.tcp_rmem = 4096 87380 16777216 net.ipv4.tcp_wmem = 4096 65536 16777216 net.core.netdev_max_backlog = 30000 net.ipv4.tcp_congestion_control=htcp net.ipv4.tcp_mtu_probing=1 Any ideas what might be happening here? Or better yet, are there some good documentation resources designed for beginners?

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• Is it possible to configure simultaneous authentication against 2 different AD domains by IIS 7?

  - by just3ws

  Basically, I need to be able to attempt to authenticate against two different AD domains from IIS. I'd like to be able to automatically query both AD's and whichever comes back with an authentication wins. The users are completely separate and will only exist in their respective domain.         IIS           |           |   /-------------\   |                 |  ------        ------  AD1         AD2  JoeU        AmyU  JillU         JohnU So, if IIS requests to authenticate JoeU it will query both domains. JoeU will be found in AD1 so we can ignore whatever response comes back from AD2. Is this even possible using stock IIS 7? Is there a middleware or something to allow this type of configuration on IIS 7? Would this be a job for some kind of middleware sitting between IIS and the AD domains?

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• How to set minimum SQL Server resource allocation for a database?

  - by Jeff Widmer

  Over the past Christmas holiday week, when the website I work on was experiencing very low traffic, we saw several Request timed out exceptions (one on each day 12/26, 12/28, 12/29, and 12/30) on several pages that require user authentication. We rarely saw Request timed out exceptions prior to this very low traffic week. We believe the timeouts were due to the database that it uses being "spun down" on the SQL Server and taking longer to spin up when a request came in. There are 2 databases on the SQL Server (SQL Server 2005), one which is specifically for this application and the other for the public facing website and for authentication; so in the case where users were not logged into the application (which definitely could have been for several hours at a time over Christmas week) the application database probably received no requests. We think at this point SQL Server reallocated resources to the other database and then when a request came in, extra time was needed to spin up the application database and the timeout occurred. Is there a way to tell SQL Server to give a minimum amount of resources to a database at all times?

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• simple apache2 reverse proxy setup not working

  - by Nick

  I know what proxy is (very high level), it's just I have never set up one, and it feels like I might be missing some big fat point here. My setup: client server (static IP), runs apache on port 80 proxy (has 2 network cards, one is on the clients network, the other one with a static IP on the server network), runs apache on port 80 I am trying to configure these three machines so that when client requests: http://proxy/machine1 It gets served server's pages at server root URL, i.e. http://server/ I can access client pages just fine. However, when I try accessing a page from the client machine, it simply gets redirected to server's IP address, which it clearly can't access since they are not on the same network: ... <meta http-equiv="REFRESH" content="0;url=http://server/machine1"></meta> <title>Redirect</title> ... My apache2 config is: LoadModule proxy_module /modules/mod_proxy.so LoadModule proxy_http_module /modules/mod_proxy_http.so ProxyRequests off <Proxy *> Order Allow,Deny Allow from all </Proxy> ProxyPass /machine1 http://server:80 <Location /machine1> ProxyPassReverse / </Location> What gives? Thanks!

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• How to hide subfolder when using Web.config for subdomains?

  - by mc-kay

  I have FTP access to my ASP.NET Websapce (IIS 7) and I route subdomains with a Web.config in the web root folder. She looks like this: <?xml version="1.0" encoding="UTF-8"?> <configuration> <system.webServer> <rewrite> <rules> <rule name="route www and emtpy requests" stopProcessing="true"> <match url=".*" /> <conditions logicalGrouping="MatchAll" trackAllCaptures="false"> <add input="{HTTP_HOST}" pattern="^(www.)?example.com" /> <add input="{PATH_INFO}" pattern="^/www/" negate="true" /> </conditions> <action type="Rewrite" url="\www\{R:0}" /> </rule> <rule name="route to blog" stopProcessing="true"> <match url=".*" /> <conditions logicalGrouping="MatchAll" trackAllCaptures="false"> <add input="{HTTP_HOST}" pattern="^blog.example.com$" /> <add input="{PATH_INFO}" pattern="^/blog/" negate="true" /> </conditions> <action type="Rewrite" url="\blog\{R:0}" /> </rule> </rules> </rewrite> </system.webServer> </configuration> As you can see i have two folders in my root directory: "www" and "blog". When i now enter "blog.example.com" everythink is working fine, but when i click a link i will go to "blog.example.com/blog" What can I do to prevent this behavior ?

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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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• nginx: SSI working on Apache backend, but not on gunicorn backend

  - by j0nes

  I have nginx in front of an Apache server and a gunicorn server for different parts of my website. I am using the SSI module in nginx to display a snippet in every page. The websites include a snippet in this form: For static pages served by nginx everything is working fine, the same goes for the Apache-generated pages - the SSI include is evaluated and the snippet is filled. However for requests to my gunicorn backend running a Python app in Django, the SSI include does not get evaluated. Here is the relevant part of the nginx config: location /cgi-bin/script.pl { ssi on; proxy_pass http://default_backend/cgi-bin/script.pl; include sites-available/aspects/proxy-default.conf; } location /directory/ { ssi on; limit_req zone=directory nodelay burst=3; proxy_pass http://django_backend/directory/; include sites-available/aspects/proxy-default.conf; } Backends: upstream django_backend { server dynamic.mydomain.com:8000 max_fails=5 fail_timeout=10s; } upstream default_backend { server dynamic.mydomain.com:80; server dynamic2.mydomain.com:80; } proxy_default.conf: proxy_redirect off; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; What is the cause for this behaviour? How can I get SSI includes working for my pages generated on gunicorn? How can I debug this further?

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• Need Corrected htaccess File

  - by Vince Kronlein

  I'm attempting to use a wordpress plugin called WP Fast Cache which creates static html files from all your posts, pages and categories. It creates the following directory structure inside wp-content: wp_fast_cache example.com pagename index.html categoryname postname index.html basically just a nested directory structure and a final index.html for each item. But the htaccess edits it makes are crazy. #start_wp_fast_cache - do not remove this comment <IfModule mod_rewrite.c> RewriteEngine On RewriteCond %{REQUEST_METHOD} ^(GET) RewriteCond /home/user/public_html/wp-content/wp_fast_cache/%{HTTP_HOST}%{REQUEST_URI}x__query__x%{QUERY_STRING}index.html -f RewriteCond %{HTTP_USER_AGENT} !(iPhone|Windows\sCE|BlackBerry|NetFront|Opera\sMini|Palm\sOS|Blazer|Elaine|^WAP.*$|Plucker|AvantGo|Nokia) RewriteCond %{HTTP_COOKIE} !(wordpress_logged_in) [NC] RewriteRule ^(.*)$ /home/user/public_html/wp-content/wp_fast_cache/%{HTTP_HOST}%{REQUEST_URI}x__query__x%{QUERY_STRING}index.html [L] RewriteCond %{REQUEST_METHOD} ^(GET) RewriteCond %{QUERY_STRING} ^$ RewriteCond /home/user/public_html/wp-content/wp_fast_cache/%{HTTP_HOST}%{REQUEST_URI}index.html -f RewriteCond %{HTTP_USER_AGENT} !(iPhone|Windows\sCE|BlackBerry|NetFront|Opera\sMini|Palm\sOS|Blazer|Elaine|^WAP.*$|Plucker|AvantGo|Nokia) RewriteCond %{HTTP_COOKIE} !(wordpress_logged_in) [NC] RewriteRule ^(.*)$ /home/user/public_html/wp-content/wp_fast_cache/%{HTTP_HOST}%{REQUEST_URI}index.html [L] </IfModule> #end_wp_fast_cache No matter how I try and work this out I get a 404 not found. And not the Wordpress 404, and janky apache 404. I need to find the correct syntax to route all requests that don't exist ie: files or directories to: wp-content/wp_fast_cache/hostname/request_uri/ So for example: Page: example.com/about-us/ => wp-content/wp_page_cache/example.com/about-us/index.html Post: example.com/my-category/my-awesome-post/ => wp-content/wp_fast_cache/example.com/my-category/my-awesome-post/index.html Category: example.com/news/ => wp-content/wp_fast_cache/example.com/news/index.html Any help is appreciated.

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• How to debug slow queries in Django+Postgres

  - by lacker

  My database queries from Django are starting to take 1-2 seconds and I'm having trouble figuring out why. Not too big a site, about 1-2 requests per second (that hit Django; static files are just served from nginx.) The thing that confuses me is, I can replicate the slowness in the Django shell using debug mode. But when I issue the exact same queries at an sql prompt they are fast. It takes about a second for a query to return, but when I check connection.queries it reports the time as under 10 ms. Here's an example (from the Django shell): >>> p = PlayerData.objects.get(uid="100000521952372") >>> a = time.time(); p.save(); print time.time() - a 1.96812295914 >>> for d in connection.queries: print d["time"] ... 0.002 0.000 0.000 How can I figure out where this extra time is being spent? I'm using Apache+mod_wsgi in daemon mode, but this happens with just the django shell as well, so I figure it is not apache-related.

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• How to set only specific nginx server block into maintenance mode programmatically

  - by Ville Mattila

  I am looking for a solution to automate one of our application's deployment process. In the beginning of deployment, I would like to programmatically set the specified server into maintenance mode and finally after the deployment has been completed, remove the maintenance mode flag from the nginx server. By maintenance mode, I mean that nginx should response with HTTP Response Code 503 to all the requests (with possible custom page). I know how to set the server block to respond with 503 code (see http://www.cyberciti.biz/faq/custom-nginx-maintenance-page-with-http503/) but the question is about how to do this programmatically and most efficiently. Two options have came to my mind: Option 1: At the beginning of the deployment process, write a maintenance file into document root and conditionally check an existence of the maintenance file in nginx server config: server { if (-f $document_root/in_maintenance_mode) { return 503; } } This method contains certain overhead as the file existence is checked for each request. Is it possible to check the file existence only when loading the nginx config? Option 2: Deployment script replaces the whole nginx server configuration file with a maintenance version and swaps it back in the end of the deployment. If this method is used, I am concerned about possible other automation processes like puppet that may be override the maintenance configuration file.

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• Forcing a particular SSL protocol for an nginx proxying server

  - by vitch

  I am developing an application against a remote https web service. While developing I need to proxy requests from my local development server (running nginx on ubuntu) to the remote https web server. Here is the relevant nginx config: server { server_name project.dev; listen 443; ssl on; ssl_certificate /etc/nginx/ssl/server.crt; ssl_certificate_key /etc/nginx/ssl/server.key; location / { proxy_pass https://remote.server.com; proxy_set_header Host remote.server.com; proxy_redirect off; } } The problem is that the remote HTTPS server can only accept connections over SSLv3 as can be seen from the following openssl calls. Not working: $ openssl s_client -connect remote.server.com:443 CONNECTED(00000003) 139849073899168:error:140790E5:SSL routines:SSL23_WRITE:ssl handshake failure:s23_lib.c:177: --- no peer certificate available --- No client certificate CA names sent --- SSL handshake has read 0 bytes and written 226 bytes --- New, (NONE), Cipher is (NONE) Secure Renegotiation IS NOT supported Compression: NONE Expansion: NONE --- Working: $ openssl s_client -connect remote.server.com:443 -ssl3 CONNECTED(00000003) <snip> --- SSL handshake has read 1562 bytes and written 359 bytes --- New, TLSv1/SSLv3, Cipher is RC4-SHA Server public key is 1024 bit Secure Renegotiation IS NOT supported Compression: NONE Expansion: NONE SSL-Session: Protocol : SSLv3 Cipher : RC4-SHA <snip> With the current setup my nginx proxy gives a 502 Bad Gateway when I connect to it in a browser. Enabling debug in the error log I can see the message: [info] 1451#0: *16 peer closed connection in SSL handshake while SSL handshaking to upstream. I tried adding ssl_protocols SSLv3; to the nginx configuration but that didn't help. Does anyone know how I can set this up to work correctly?

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• Serving and caching content from Amazon S3 with Tomcat

  - by Rob

  Hi all, We're looking to serve a range of content using Amazon S3 as a store for the content and Tomcat to host the web application. The content is divided into free and paid for content. We intend to authenticate the users when they access the web application running in Tomcat. Based around their authentication we are able to tell if the user has access to paid for content or simply free stuff. So I envision the flow of a request being something like this: Authenticated request to Tomcat If user is "paid" user, display links to premium content Direct requests for paid content back through Tomcat to prevent direct access to it by non-paying users. Tomcat makes request to S3 through a web cache to keep our costs down Content is returned to user. As we have to pay for each request to S3, I'd ideally like to cache content locally to the Tomcat instance after it has been requested for the first time to keep costs to a minimum and to speed things up. I would also like to be able to invalidate this cache if we publish fresh content to S3. So to confirm my proposal: Client Request - Tomcat - Web Cache - S3 To invalidate the cache, I was thinking of using something like PubSubHubbub with the cache waiting for updates to the feed for content that it should invalidate. I'd appreciate some general feedback on this approach as I've no real experience of caching and I'm sure I've made some invalid assumptions. I'd also appreciate any recommendations for caching technologies. Thanks.

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• How should I configure my Active Directory servers so that if one goes down, users are not kicked off SQL?

  - by Matty Brown

  Today, we shut down one of our Active Directory servers during office hours to check the loading on a UPS. Since all the server did was provide Active Directory in a separate building incase the main building caught fire, or whatever, we didn't think it would have any effect on our users. Seconds after the server was shut down, we had a dozen phone calls from users experiencing this issue:- [Microsoft SQL Server Login] SQLState: '28000' [Microsoft][ODBC SQL Server Driver][SQL Server]Login failed. The login is from an untrusted domain and cannot be used with authentication. Once we realized what had happened, we quickly rebooted the down Active Directory server. Problem solved. But why did this happen. And what if one day a server has a breakdown and is offline for hours, or days? Shouldn't the other Active Directory servers in the domain service authentication requests without disruption to users? We have 3 Windows Server 2003 Standard servers running Active Directory as Domain Controllers with Global Catalogs, all physically located on the same network at Gigabit speeds. I believe the domain was originally Windows Server 2000, or maybe even NT 4.0. Could the issue be to down to old Group Policies inherited from these old server OS's, or some default setting in Active Directory that needs changing?

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• IIS8 Asp.net State service remote connection failure

  - by maxisam

  Recently we upgrade our web server to windows server 2012 with IIS8. We have this issue when users try to connect the asp.net state service to this web server remotely. It always popup Unable to make the session state request to the session state server. Please ensure that the ASP.NET State service is started and that the client and server ports are the same. If the server is on a remote machine, please ensure that it accepts remote requests by checking the value of HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\aspnet_state\Parameters\AllowRemoteConnection. If the server is on the local machine, and if the before mentioned registry value does not exist or is set to 0, then the state server connection string must use either 'localhost' or '127.0.0.1' as the server name. In IIS7 / 7.5 we use the same way and it works fine. As long as the state service is running and firewall is set properly, we don't have any problem. However, in IIS8 it doesn't work. (We even turn off firewall to test it) Thanks for helping.

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• Wireless disconnects at random after upgrade to Ubuntu 10.4

  - by Daniel Elessedil Kjeserud

  After upgrading my home server from Ubuntu 8.10 to 10.4 my wireless seemingly drops out, even though my IRC client keeps it's connection to the servers, so it looks like the machine just stops taking wireless requests. A ping will give a me this Request timeout for icmp_seq 27 ping: sendto: Host is down After a while the machine just starts responding again, without any interaction from me. When the machine comes back, this is what dmesg gives me [ 18.296288] wlan0: direct probe to AP 00:1b:63:22:a4:5f (try 1) [ 18.296350] wlan0: deauthenticating from 00:1b:63:22:a4:5f by local choice (reason=3) [ 18.296440] wlan0: direct probe to AP 00:1b:63:22:a4:5f (try 1) [ 18.298697] wlan0: direct probe responded [ 18.298706] wlan0: authenticate with AP 00:1b:63:22:a4:5f (try 1) [ 18.306836] wlan0: authenticated [ 18.306886] wlan0: associate with AP 00:1b:63:22:a4:5f (try 1) [ 18.309396] wlan0: RX AssocResp from 00:1b:63:22:a4:5f (capab=0x411 status=0 aid=2) [ 18.309402] wlan0: associated [ 18.310187] ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready [ 18.447742] apm: BIOS version 1.2 Flags 0x03 (Driver version 1.16ac) [ 18.447748] apm: overridden by ACPI. [ 19.163282] padlock: VIA PadLock not detected. [ 28.352022] wlan0: no IPv6 routers present kjes@brin:~$ lspci 02:07.0 Network controller: RaLink RT2561/RT61 rev B 802.11g It's on a wireless network with WPA2, the machine worked without any problems on the same wireless network since Ubuntu 8.10 was the most resent version, and there have been no changes to my network recently. Even though the server drops out, everything else on the network keeps working like normal.

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• How can Django/WSGI and PHP share / on Apache?

  - by Mark Snidovich

  I have a server running an established PHP site, as well as some Django apps. Currently, a VirtualHost set up for PHP listens on port 80, and requests to certain directories are proxied to a VirtualHost set up for Django with WSGI. I'd like to change it so Django handles anything not existing as a PHP script or static file. For example, / -parsed by PHP as index.php /page.php -parsed as PHP normally /images/border.jpg -served as a static file /johnfreep -handled by Django (interpreted by urls.py) /pages/john -handled by Django /(anything else) - handled by Django I have a few ideas. It seems the options are 'php first' or 'wsgi first'. set up Django on port 80, and set Apache to skip all the known PHP, CSS or image files. Maybe using SetHandler? Anything else goes to Django to be parsed by urls.py. Set up a script referring everything to Django as a 404 handler on PHP. So, if a file is not found for a name, it sends the request path to a VirtualHost running Django to be parsed.

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• Inconsistent DHCP replies with Windows 2008R2 DHCP server

  - by verbalicious

  I've got a Windows 2008R2 standard server running DHCP services. We've noticed that certain clients are receiving inconsistent DHCP replies. We have over 175 Windows workstations in this VLAN that don't seem to have trouble getting DHCP leases. However, PXE-booting clients trying to reach our DHCP server are able to get a lease inconsistently. Additionally, we tried using the "dhcping" tool against our DHCP server and found that roughly two of every three requests time out with "no answer" -- and this holds true when we set the timeout value on dhcping to 20seconds. After a failed attempt, however, we may get a dhcp lease reply immediately with dhcping. This leads me to believe that this issue isn't confined to PXE booting clients, but something more systemic with my LAN layer2 or DHCP. And that possibly my 175 windows clients are experiencing this in some form without my knowledge. We have over 30% of our scope available so the addresses are there. I was unable to find anything in the Windows server "DHCP-Server" log. Of course, my goal is to have my DHCP server reply to every request that it receives on the LAN!

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• Windows, why 8 GB of RAM feel like a few MB?

  - by Desmond Hume

  I'm on Windows 7 x64 with 4-core Intel i7 and 8 GB of RAM, but lately it feels like my computer's "RAM" is located solely on the hard drive. Here is what the task manager shows: The total amount of memory used by the processes in the list is just about 1 GB. And what is happening on my computer for a few days now is that one program (Cataloger.exe) is continually processing large quantities of (rather big) files, repeatedly opening and reading them for the purposes of cataloging. But it doesn't grow too much in memory and stays about that size, about 90 MB. However, the amount of data it processes in, say, 30 minutes can be measured in gigabytes. So my guess was that Windows file caching has something to do with it. And after some research on the topic, I came across this program, called RamMap, that displays detailed info on a computer's RAM. Here is the screenshot: So to me it looks like Windows keeps in RAM huge amounts of data that is no longer needed, redirecting any RAM allocation requests to the pagefile on the hard drive. Even when I close Cataloger.exe, the RamMap reports the size of the mapped file as about the same for a long time on. And it's not just this particular program. Earlier I noticed that similar slowdown occurred after some massive file operations with other programs. So it's really not an exception. Whatever it is, it slows down the computer by like 50 times. Opening a new tab in Chrome takes 20-30 seconds, opening a new program can take up to a minute. Due to the slowdown, some programs even crash. So what do you think, is the problem hiding in file caching or somewhere else? How do I solve it?

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