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• ESXi - change to thin - virtual disk filesize is the same

  - by sven

  running ESXi 5.5 here with a datastore on a single SSD. Now, I thought about changing to thin disks from thick and found that I could use a tool on the ESXi host to do that. However, the file size of the new created virtual disk is not changing. I run: vmkfstools -i loader.vmdk -d 'thin' thinloader.vmdk Destination disk format: VMFS thin-provisioned Cloning disk 'loader.vmdk'... Clone: 100% done. After that I compared the virtual disksizes: ls -la *.vmdk -rw------- 1 root root 32212254720 Jun 10 08:25 loader-flat.vmdk -rw------- 1 root root 467 May 21 17:04 loader.vmdk -rw------- 1 root root 32212254720 Jun 10 08:27 thinloader-flat.vmdk -rw------- 1 root root 520 Jun 10 08:33 thinloader.vmdk Stats on the original file: stat loader.vmdk File: loader.vmdk Size: 467 Blocks: 0 IO Block: 131072 regular file Device: 8bf64d175e27544ch/10085333178302026828d Inode: 419443780 Links: 1 Access: (0600/-rw-------) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2014-01-25 10:17:34.000000000 Modify: 2014-05-21 17:04:06.000000000 Change: 2014-05-21 17:04:06.000000000 and on the thin file: stat thinloader.vmdk File: thinloader.vmdk Size: 520 Blocks: 0 IO Block: 131072 regular file Device: 8bf64d175e27544ch/10085333178302026828d Inode: 432026692 Links: 1 Access: (0600/-rw-------) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2014-06-10 08:27:45.000000000 Modify: 2014-06-10 08:33:30.000000000 Change: 2014-06-10 08:33:30.000000000 Anyone an idea why the disk is not providing any more space (tried with multiple VM's already - all the same)? Also, I have noticed that the newly created file "autoappend" "-flat" to the disk ... Thanks Sven Update - diff of the vmdk config* --- loader.vmdk +++ thinloader.vmdk @@ -7,15 +7,17 @@ createType="vmfs" -RW 62914560 VMFS "loader-flat.vmdk" +RW 62914560 VMFS "thinloader-flat.vmdk" ddb.adapterType = "lsilogic" +ddb.deletable = "true" ddb.geometry.cylinders = "3916" ddb.geometry.heads = "255" ddb.geometry.sectors = "63" ddb.longContentID = "6d95855805dfa0079327dfee29b48dca" -ddb.uuid = "60 00 C2 98 d5 7d 17 bf-ac 54 70 b1 2d 39 43 d5" +ddb.thinProvisioned = "1" +ddb.uuid = "60 00 C2 93 c4 13 6c cf-bb 7b 34 c9 2c b4 dc 1e" ddb.virtualHWVersion = "8"

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• Appears to be "randomly" switching between the acl matched backend and the default backend

  - by Xoor

  I have HAProxy acting as a proxy in front of: An NGinx instance An in-house load balancer in front of multiple dynamic services exposed with socket.io (websockets) My problem is that from time to time my connections are proxied correctly to my socket.io cluster, and then randomly it fallsback to routing to NGinx which obviously is annoying and meaningless since NGinx isn't mean't to handle the request. This happens when requesting for URLs of the format : http://mydomain.com/backends/* There's an ACL in the HAProxy config to match the '/backends/*' path. Here's a simplified version of my HAProxy config (removed extra unrelated entries and changed names): global daemon maxconn 4096 user haproxy group haproxy nbproc 4 defaults mode http timeout server 86400000 timeout connect 5000 log global #this frontend interface receives the incoming http requests frontend http-in mode http #process all requests made on port 80 bind *:80 #set a large timeout for websockets timeout client 86400000 # Default Backend default_backend www_backend # Loadfire (socket cluster) acl is_loadfire_backends path_beg /backends use_backend loadfire_backend if is_loadfire_backends # NGinx backend backend www_backend server www_nginx localhost:12346 maxconn 1024 # Loadfire backend backend loadfire_backend option forwardfor # This sets X-Forwarded-For option httpclose server loadfire localhost:7101 maxconn 2048 It's really quite confusing for me why the behaviour appears to be "random", since being hard to reproduce it's hard to debug. I appreciate any insight on this.

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• Trouble installing SSL Certificate on Apache

  - by jahufar

  We have a dedicated server with GoDaddy running Plesk that requires SSL. I've generated the certificate files and I created a vhost_ssl.conf (since I can't edit the default plesk apache configuration http.include, vhost_ssl.conf gets Included to httpd.include) that tells apache where to find the certificate files: SSLCertificateFile /usr/local/psa/var/certificates/domain.com.crt SSLCertificateKeyFile /usr/local/psa/var/certificates/domain.com.key SSLCertificateChainFile /usr/local/psa/var/certificates/sub.class1.server.ca.pem When I stop/start apache, it refuses to start up. The error_log does not have anything on it either (which is strange). Then I opened up httpd.include and found this bit: <VirtualHost 208.xxx.xxx.xxx:443> ServerName domain.com:443 ServerAlias www.domain.com UseCanonicalName Off SSLEngine on SSLVerifyClient none SSLCertificateFile /usr/local/psa/var/certificates/certagC9054 Include /var/www/vhosts/domain.com/conf/vhost_ssl.conf Then I commented out SSLCertificateFile /usr/local/psa/var/certificates/certagC9054 (which is plesk's SSL certificate) and restarted apache and it worked perfectly fine. It seems that Apache does not like multiple SSLCertificateFile within the same VirtualHost directive? As anyone who worked with plesk knows, I can't just remove SSLCertificateFile directive in httpd.include as plesk will overwrite my changes when someone uses it - which is why it's in vhost_ssl.conf. So I'm stuck and this is beyond my meager admin skills. Would appreciate someone who knows what (s)he's doing to tell me whats going on. Thanks in advance.

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• How can I make Cygwin open a new window each time I use a Window 7 keyboard shortcut?

  - by Michael Gundlach

  [Update: The short answer is, if an application in the 3rd thing on your taskbar, press WindowsKey+Shift+3 to open a new instance. Hooray!] I have Chrome and Cygwin on my taskbar. Chrome's shortcut is Ctrl-Alt-C (as set through right clicking the icon and putting Ctrl-Alt-C into Chrome - Properties - Shortcut Key). Cygwin's shortcut is Ctrl-Alt-T. When I press Ctrl-Alt-C, I get a new Chrome window. Great! It's as if I had shift-clicked on the Chrome icon. When I press Ctrl-Alt-T, I get a Cygwin window the first time, but after that I just get focused on the Cygwin window. As if I had simply clicked on the Cygwin icon and not shift-clicked. As if Cygwin wasn't able to have more than one instance open. I can still shift-click the icon to get more instances. I've tried with different keys than Ctrl-Alt-T and got the same behavior. Strangely, I've twice managed to get it into a state (via just clearing and setting the shortcut key over and over) where a shortcut WOULD open multiple instances -- but it was Ctrl-Alt-G both times, which doesn't make sense to my brain which has been trained to use Ctrl-Alt-T for years. Ctrl-Alt-G usually behaves just as poorly as Ctrl-Alt-T, except for the two times when magically it started behaving properly. So I'm thinking this is a Windows 7 bug (which has existed since Windows XP at least), but I'm hoping someone knows something I don't :)

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• Identifying Hard Drive as performance bottleneck for desktop machines

  - by Programming Hero

  I'm working in a development team where we all use laptops so we can work in multiple locations. These laptops are proving notoriously slow for development work, but at a glance they all look to have the specification for a much faster experience: CPU - Intel Core 2 Duo T7500 Memory - 2GB of RAM We all experience the biggest delays when the hard-drives are being accessed, particularly when swap-files are being thrashed. After doing a little bit of profile, a colleague discovered that our HDDs are seeing Read/Write speeds of about 10MB/sec. This seems abnormally low and we believe it the cause of the problem. Sensibly (though somewhat annoyingly) our business wont blow money on faster drives just to see if it fixes the problem; we need to illustrate this is definitely the problem and that buying some solid-state drives will make it go away. I need some way of showing how 90% of the system resources aren't being used over the course of a day, and that whenever there is utilization, it's all in HDD reads or writes. Are there any tools I could use to provide this information? Does it seem likely the problem is going to be fixed by a faster drive? Should I be looking for alternatives?

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• Application to automate Windows software installation in a test lab

  - by Marc

  I have several test environments (hyper-V) which contain a variety of windows servers. Each machine needs periodically rolling back to a given snapshot and then re-installing with the latest version of our software to test. The software installs are quite complex MSI's with a fair few option screens. I know that the installs can be driven from the command line, passing in parameters to override the wizard options. At the simplest level I suppose I could just write a batch file to kick off each install with the required parameters, however the values that are passed in do need to change from time to time (and environment to environment) so a tool with a config file and simple GUI seems like a better idea. I think what makes it slightly more painful is the multiple environments. For example one environment might contain 4 servers and need a config file with all the server names, service endpoints etc. Another environment might be a 1-box install with all names and endpoints set to localhost. So, ideally I want to be able to store different setup configurations and use them to run all the required installers with the relevant settings against the relevant machines. Before I go off to write the thing, does anyone know of an existing, simple, free tool that will let me achieve this?

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• How to configure mod_proxy_balancer to gracefully fail under high load

  - by bramp

  We have a system which has one Apache instance in front of multiple tomcats. These tomcats then connect to various databases. We balance the load to the tomcat with mod_proxy_balancer. Currently we are receiving 100 requests a second, the load on the Apache server is quite low, but due to database heavy operations on the tomcats, the load there is roughly 25% (of what I estimate they can handle). In a few weeks there is an event happening and we estimate that our requests will jump significant, maybe by a factor of 10. I'm doing everything I can do reduce the load on our tomcats, but I know we are going to run out of capacity, so I would like to fail gracefully. By this I mean, instead of trying to deal with too many connections which all timeout, I would like Apache to somehow monitor average response time, and as soon as the response time to Tomcat is getting above some threshold, I would like a error page displayed. This means that users who are lucky still get a page rendered quickly, and those who are unlucky get a error page quickly. Instead of everyone waiting far too long for their page, and eventually everyone timing out, and the database being swamped with queries which are never used. Hopefully this makes sense, so I was looking for suggestions on how I could achieve this. thanks

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• Cannot 301 redirect with IIS URL Rewrite Module

  - by Justin

  I am trying to troubleshoot my issue with the URL Rewrite Module on IIS 7. I migrated a Wordpress blog over to BlogEngine.net. There were only about 5 entries that I wanted to use 301 redirects to the new blog, so I wanted to simply create 5 exact match redirect rules using the rewrite module. For some reason the exact match rule never seems to take effect, I always get a 404 error when the original url is navigated to. I verified that my exact match pattern matched the existing backlinks and it does. I then tried a simple test and got the same behavior, no redirection. I created a page, test.html, on my site, I then created a second page, test2.html. So my exact match pattern is: "http://www.mydomain.com/test.html" And the rule is supposed to do a 301 redirect to "http://www.mydomain.com/test2.html " The redirect never happens. I created the steps for the rule based on the instructions in this page: http://learn.iis.net/page.aspx/461/creating-rewrite-rules-for-the-url-rewrite-module/ I don't see that I left out a step. After I apply the rule I've even gone as far as doing an IISReset to make sure it would be in effect but still no luck. Any thoughts on what I might have left out? (Note: my rewrite rules dont include the " " around them but I had to add since serverfault thinks I am trying to spam the system with multiple urls.)

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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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• Misconfigured external monitor on Mac OS X Snow Leopard 10.6.3

  - by Mike

  I have an external monitor (specifically, an HDTV) hooked up to my 2.53GHz 13" macbook pro. This display works fine and I use it with my mac in clamshell mode (eg. with an external keyboard/mouse and the laptop closed and the built-in mac screen turned off) My Mac has multiple users on it. For User A I can use the mac with the external monitor in both clamshell and dual-monitor setups. For User B, I can use the monitor in a dual-monitor setup, but whenever I switch to clamshell mode the Mac switches to an incorrect output resolution or frequency setting that my HDTV doesn't recognize, resulting in a blank screen and a message about Unsupported Resolution. Chances are I did this to myself by misconfiguring my display settings at some point in the past, but I have no idea how to undo it. I (obviously) can't seen the display to change the settings when it's borked. I can see the display settings if I switch to Dual-monitor mode, but those settings only affect the dual monitor setup; no matter how I change the settings in dual-monitor mode, the clamshell mode setup remains borked. How can I dig myself out of this hole?

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• Multi-IP address zimbra server DNS PTR records and spam

  - by David Fraser

  We have a mail server running Zimbra (ZCS 6.0.8). The server has 5 active public IP addresses in the same subnet. (.226-.230). I currently have A records for each of these (host0.domain.com..host4.domain.com), with the main host.domain.com of the machine pointing to .226. Our host has ended up being listed on the SORBS DUHL list (even though it's in a server farm). According to them you can get removed quickly by checking that your host has an MX record, an A record, and a PTR record that points back to the hostname given in the MX record. I tried setting the PTR records so that each of these addresses resolved back to their A record (i.e. .228 had a PTR to host2.domain.com). However, I then got mail being rejected from other servers because when Postfix (under Zimbra control) sends out mail, it uses the main hostname for the HELO - there doesn't seem to be any way to override it. So the PTR records currently say host.domain.com for all 5 IP addresses. What's the correct way to handle this? Should I have an A record for the domain that points to all the IP addresses (for round-robin handling)? I'm nervous of changes that could cause problems, so I'm wondering what the standard way to handle a multiple-IP-address mail server is.

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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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• SQL Server 2005 standard filegroups / files for performance on SAN

  - by Blootac

  Ok so I've just been on a SQL Server course and we discussed the usage scenarios of multiple filegroups and files when in use over local RAID and local disks but we didn't touch SAN scenarios so my question is as follows; I currently have a 250 gig database running on SQL Server 2005 where some tables have a huge number of writes and others are fairly static. The database and all objects reside in a single file group with a single data file. The log file is also on the same volume. My interpretation is that separate data files should be used across different disks to lessen disk contention and that file groups should be used for partitioning of data. However, with a SAN you obviously don't really have the same issue of disk contention that you do with a small RAID setup (or at least we don't at the moment), and standard edition doesn't support partitioning. So in order to improve parallelism what should I do? My understanding of various Microsoft publications is that if I increase the number of data files, separate threads can act across each file separately. Which leads me to the question how many files should I have. One per core? Should I be putting tables and indexes with high levels of activity in separate file groups, each with the same number of data files as we have cores? Thank you

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• How do I configure custom URL handlers on OS X?

  - by cwd

  I've been reading a lot online about custom URL handlers / custom protocol handlers such as: Launching External Applications using Custom Protocols under OSX OS X URL handler to open links to local files I get that you can tell the system that a particular program is able to handle a certain scheme / protocol with the Info.plist file: <key>CFBundleURLTypes</key> <array> <dict> <key>CFBundleURLName</key> <string>Local File</string> <key>CFBundleURLSchemes</key> <array> <string>local</string> </array> </dict> </array> <key>NSUIElement</key> <true/> But if there are multiple applications that are capable of opening the same URL handler, such as mailto: how do you specify which one you want the system to use? There were some references to utilities like the More Internet preference pane which no longer seems to be available from the author's site. I did find it online by Googling but it seems a bit shaky - like it was written for an older OSX - perhaps Tiger. I haven't been able to find information on how to set the URL handler for protocols and custom protocols. I'm assuming there is a plist file somewhere that I can edit - or maybe there is a newer, better utility that works well with Mountain Lion?

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• MediaWiki migrated from Tiger to Snow Leopard throwing an exceptions

  - by Matt S

  I had an old laptop running Mac OS X 10.4 with macports for web development: Apache 2, PHP 5.3.2, Mysql 5, etc. I got a new laptop running Mac OS X 10.6 and installed macports. I installed the same web development apps: Apache 2, PHP 5.3.2, Mysql 5, etc. All versions the same as my old laptop. A Mediawiki site (version 1.15) was copied over from my old system (via the Migration Assistant). Having a fresh Mysql setup, I dumped my old database and imported it on the new system. When I try to browse to mediawiki's "Special" pages, I get the following exception thrown: Invalid language code requested Backtrace: #0 /languages/Language.php(2539): Language::loadLocalisation(NULL) #1 /includes/MessageCache.php(846): Language::getFallbackFor(NULL) #2 /includes/MessageCache.php(821): MessageCache->processMessagesArray(Array, NULL) #3 /includes/GlobalFunctions.php(2901): MessageCache->loadMessagesFile('/Users/matt/Sit...', false) #4 /extensions/OpenID/OpenID.setup.php(181): wfLoadExtensionMessages('OpenID') #5 [internal function]: OpenIDLocalizedPageName(Array, 'en') #6 /includes/Hooks.php(117): call_user_func_array('OpenIDLocalized...', Array) #7 /languages/Language.php(1851): wfRunHooks('LanguageGetSpec...', Array) #8 /includes/SpecialPage.php(240): Language->getSpecialPageAliases() #9 /includes/SpecialPage.php(262): SpecialPage::initAliasList() #10 /includes/SpecialPage.php(406): SpecialPage::resolveAlias('UserLogin') #11 /includes/SpecialPage.php(507): SpecialPage::getPageByAlias('UserLogin') #12 /includes/Wiki.php(229): SpecialPage::executePath(Object(Title)) #13 /includes/Wiki.php(59): MediaWiki->initializeSpecialCases(Object(Title), Object(OutputPage), Object(WebRequest)) #14 /index.php(116): MediaWiki->initialize(Object(Title), NULL, Object(OutputPage), Object(User), Object(WebRequest)) #15 {main} I tried to step through Mediawiki's code, but it's a mess. There are global variables everywhere. If I change the code slightly to get around the exception, the page comes up blank and there are no errors (implying there are multiple problems). Anyone else get Mediawiki 1.15 working on OS X 10.6 with macports? Anything in the migration from Tiger that could cause a problem? Any clues where to look for answers?

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• ASP.NET sending email through exchange problem

  - by Solmead

  I have an exchange 2010 server running on Windows 2008 R2, I also have a remote webserver running Windows 2003 with multiple sites on it (all asp.net mvc 2 sites). I setup a Transport in exchange and all the websites on my remote web server can send email no problem to anyone in the exchange server and to any external domain. Now for my problem. I am having issues with that webserver, so I moved one of the websites to run on my exchange server, it runs well (low hit website) except that email doesn't work from that site. I tried changing the Transport in exchange to add the IP address of the local machine and the 127.0.0.1 addresses and it still isn't sending any email. Any ideas on how to get this working? The remote websites can still send email no problem, the version of the site that I had to move on the remote server can still email, but on the exchange server for that website email does not send. I would guess it is a Transport issue, since it is running on the same server a firewall shouldn't be the issue. I changed the smtp setting in web.config to localhost, and now I do receive email to my account on the exchange server, but I do not receive any emails on outside addresses. To add more description, this is a custom developed asp.net mvc 2 website. And no errors were being generated in the code when sending the email in either case.

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• Haproxy not properly passing on X-Forwarded-For header

  - by JesseP

  I have backend web servers that receive requests by way of haproxy-nginx-fastcgi. The web app used to see multiple ip's coming through in the X-Forwarded-For header, chained together with commas (most original IP on the left). At some point in the recent past (just noticed, so not sure what caused it) something changed, and now I'm only seeing a single IP passed in the header to my web application. I've tried with haproxy 1.4.21 and 1.4.22 (recent upgrade) with the same behavior. Haproxy has the forwardfor header set: option forwardfor Nginx fastcgi_params config defines this header to be passed to the app: fastcgi_param HTTP_X_FORWARDED_FOR $http_x_forwarded_for; Anyone have any ideas on what might be going wrong here? EDIT: I just started logging the $http_x_forwarded_for variable in nginx logs, and nginx is only ever seeing a single IP, which shouldn't ever be the case, as we should always see our haproxy ip added in there, right? So, issue must either be in nginx handling of the variable coming in, or haproxy not building it properly. I'll keep digging... EDIT #2: I enabled request and response header logging in HAProxy, and it is not spitting anything out for X-Forwarded-For, which seems very odd: Oct 10 10:49:01 newark-lb1 haproxy[19989]: 66.87.95.74:47497 [10/Oct/2012:10:49:01.467] http service/newark2 0/0/0/16/40 301 574 - - ---- 4/4/3/0/0 0/0 {} {} "GET /2zi HTTP/1.1" O Here are the options i set for this in my frontend: mode http option httplog capture request header X-Forwarded-For len 25 capture response header X-Forwarded-For len 25 option httpclose option forwardfor EDIT #3: It really seems like haproxy is munging the header and just passing on a single one to the backend. This is fairly impacting to our production service, so if anyone has an ideas it would be greatly appreciated. I'm stumped... :(

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• Losing JSESSIONID when using ProxyHTMLURLMap

  - by Matthew Schmitt

  I've setup a reverse proxy between an Apache front-end and multiple Tomcat backends. The below block of code includes the ProxyHTMLURLMap param so that the HTML can be rewritten to remove the Tomcat context path. With this setup in place, after logging into my application, an initial JSESSIONID is set properly, but when navigating to any other page, this JSESSIONID is lost and another one is set by the application. I should mention that the initial login directs to a URL that includes the current context path (i.e. https://app.domain.com/context/home), but when navigating to another page, that context path is not present in the URL (i.e. https://app.domain.com/page2). <Proxy balancer://happcluster> BalancerMember ajp://happ01.h.s.com:8009 route=worker1 loadfactor=10 timeout=15 retry=5 BalancerMember ajp://happ02.h.s.com:8009 route=worker2 loadfactor=10 timeout=15 retry=5 BalancerMember ajp://happ03.h.s.com:8009 route=worker3 loadfactor=5 timeout=15 retry=5 BalancerMember ajp://happ04.h.s.com:8009 route=worker4 loadfactor=5 timeout=15 retry=5 BalancerMember ajp://happ05.h.s.com:8009 route=worker5 loadfactor=5 timeout=15 retry=5 ProxySet lbmethod=bytraffic ProxySet stickysession=JSESSIONID </Proxy> ProxyPass /context balancer://happcluster/context ProxyPass / balancer://happcluster/context/ <Location /context/> # Rewrite HTTP headers and HTML/CSS links for everything else ProxyPassReverse / ProxyPassReverseCookieDomain / app.domain.com ProxyPassReverseCookiePath / /context ProxyHTMLURLMap /context/ / # Be prepared to rewrite the HTML/CSS files as they come back # from Tomcat SetOutputFilter INFLATE;proxy-html;DEFLATE </Location> Has anyone ever run into a similar situation?

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• Performance associated with storing millions of files on NTFS

  - by Tim Brigham

  Does anyone have a method / formula, etc that I could use - hopefully based on both current and projected numbers of files - to project the 'right' length of the split and the number of nested folders? Please note that although similar it isn't quite the same as Storing a million images in the filesystem. I'm looking for a way to help make the theories outlined more generic. Assumptions I have 'some' initial number of files. This number would be arbitrary but large. Say 500k to 10m+. I have considered the underlying physical hardware disk IO requirements that would be necessary to support such an endeavor. Put another way As time progresses this store will grow. I want to have the best balance of current performance and as my needs increase. Say I double or triple my storage. I need to be able to address both current needs and projected future growth. I need to both plan ahead and not sacrifice too much of current performance. What I've come up with I'm already thinking about using a hash split every so many characters to split things out across multiple directories and keeping the trees even, very similar as outlined in the comments in the question above. It also avoids duplicate files, which would be critical over time. I'm sure that the initial folder structure would be different based on what I've outlined, and depending on the initial scale. As far as I can figure there isn't a one size fits all solution here. It would be horrendously time intensive to work something out experimentally.

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• How to get multipath working for Ubuntu Server 12.04

  - by mlampi

  I'm working on a project which aims to make use of Ubuntu servers running on enterprise class hardware. In our case that means IBM HS23E blade servers, QLogic 4GB fibre channel extension cards and quite old IBM DS4500 disk array with two controllers. At the moment we have fibre channel as only boot option and Ubuntu Server 12.04 installed just fine and is able to boot without multipath. I'm not a linux professional myself but in our team we have people who will understand the technical stuff. Don't let my post confuse :) The current situation is that we have only one fibre channel connection to a single disk array controller. Real life case would be of course quite different. At minimum we should have two fibre channel ports connected to two different switches and two different controllers. However, we have no idea how to set up multipath tool. Is the DM-MPIO the right software? At minimum we should be able to boot when multiple connections are available and achieve fault tolerance when any of them should be down. Since the disk array is not the latest hardware, I managed to find RDAC driver sources only for 2.6.x kernel. And we have 3.2.x. Another issue is to build a multipath.conf. The said driver sources are from IBM support and the QLogic drivers provided to Ubuntu installer are from Ubuntu site. It seems that RHEL and SLES would have near out of the box support but that is not an option for our project. Actual questions: - What is the recommended software tool for multipath for Ubuntu Server 12.04? - Is there available pre-made configurations or templates? Does it require disk array / controller specific settings or do a more generic config work? - Do you have expriences on similar setup and like to share the knowledge? I'll provide you with any additional information you might require. Thanks in advance.

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• Improving browser performance while using lots of tabs?

  - by Andrew

  My browsing habits cause me to open lots of windows and tabs, either related to different projects I'm working on or things I may want to read later. I use OSX and use about 5 spaces with multiple windows in each space. The problem is eventually I'll have around 200 or more tabs open (spread over 15-20 windows) that I don't want to close. Needless to say, my computer's performance starts to degrade. As I write this on my mobile, Safari on my laptop is locking up the computer. I used to use Chrome but found better performance with Safari. What I'd like to know, is there a graph of browser performance based on tab usage? I don't need a browser that keeps all tabs active. It would be great if the browser could increase performance by "putting tabs to sleep". Or if there was some sort of tool for saving a "workspace" of tabs that you could reactivate the next time you are working on that project. What sort of solution can you recommend to solve this problem?

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• Optimize shell and awk script

  - by bryan

  I am using a combination of a shell script, awk script and a find command to perform multiple text replacements in hundreds of files. The files sizes vary between a few hundred bytes and 20 kbytes. I am looking for a way to speed up this script. I am using cygwin. The shell script - #!/bin/bash if [ $# = 0 ]; then echo "Argument expected" exit 1 fi while [ $# -ge 1 ] do if [ ! -f $1 ]; then echo "No such file as $1" exit 1 fi awk -f ~/scripts/parse.awk $1 > ${1}.$$ if [ $? != 0 ]; then echo "Something went wrong with the script" rm ${1}.$$ exit 1 fi mv ${1}.$$ $1 shift done The awk script (simplified) - #! /usr/bin/awk -f /HHH.Web/{ if ( index($0,"Email") == 0) { sub(/HHH.Web/,"HHH.Web.Email"); } printf("%s\r\n",$0); next; } The command line find . -type f | xargs ~/scripts/run_parser.sh

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• VNC failure on Xen

  - by BCable

  The following config works and creates a good VM in Xen: # Kernel Setup kernel = "/boot/vmlinuz-2.6.18.8-xenU" # Memory memory = "256" # Disk disk = [ "file:/opt/xen/domains/110/sda1.img,sda1,w", "file:/opt/xen/domains/110/swap.img,sda2,w" ] # container name name = "110" hostname = "boo" # Networking vif = ["type=ieomu, bridge=xenbr0"] # VNC vnc = 1 #vfb = [ 'type=vnc,vncdisplay=2,vnclisten=0.0.0.0,vncpasswd=110' ] # Behavior Settings root = "/dev/sda1" extra = "fastboot" But when I uncomment the VFB line, I get the following error after it hangs for at least 30 seconds: [root@customer 110]# xm create boo.cfg Using config file "./boo.cfg". Error: Device 0 (vkbd) could not be connected. Hotplug scripts not working. Any ideas? Part two of this question: Sometimes it actually works, and a port is opened. When this happens, nmap shows the VNC ports open and I can connect via the VNC client, but it just hangs at "Connection established." and no VNC display shows up. I've tried multiple VNC clients (TightVNC, TightVNC Java Console, RealVNC), but they all fail to connect. Does VNC through Xen require X to be started in order to function? I was under the impression that it would show the console screen, so I'm confused as to why all these issues are occurring. Thanks!

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• USB External HDD NOT spinning down on Windows Vista / Windows 7

  - by Deepak

  I have 3 external 2.5" USB HDDs - all from different manufacturers and with different capacities. I also have access to multiple Windows Vista / Windows 7 / Windows XP computers. My problem is that with the Windows Vista and Windows 7 computers, the external USB drives DO NOT spin down when I do "Safely remove hardware". Windows will tell me that I can safely remove the device, but I can see (and feel the rotations of the disk when I touch the casing) that the disks are still spinning and NEVER spin down. They also never go into their suspended state (which is generally signaled with a slow flashing of the activity LED). However, with Windows XP, when I do "Safely remove hardware", I can see that the drives do indeed spin down without any issues and go into their respective suspended states. I notice that this behaviour is consistent across all my 3 drives and on different hardware. Has anybody else noticed the same issues? Is there any way we can have the same behaviour as Windows XP on Windows Vista and 7, because I feel on the long run, disconnecting the drives while they are still spinning will have a negative effect on their life span. Thanks, Deepak.

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• How to backup iTunes on Windows to folder/share, i.e. without "Back Up to Disc"? No DVD writer avail

  - by Chris W. Rea

  (Surprised I didn't already find an answer here to this!) I've got a computer on which I'd like to back up the iTunes library – music, movies, apps, everything. We're talking multiple gigabytes. Unfortunately, it seems that iTunes' own built-in "Back Up to Disc" feature (the only backup feature I can find in iTunes) only functions with a CD or DVD writer/burner. The computer in question does not have a DVD burner. While it has a CD burner, attempting to back up to CDs would require dozens of discs plus more time than I'm willing to spend swapping them. So: What is the recommended way to back up an entire iTunes library on a Windows computer, to a non-CD/DVD location such as an external hard drive or a network shared folder? Then, once such a backup has been performed, what is the process for restoring the library – e.g. after the computer has been repaved with a new version of Windows – so that iTunes is resurrected whole and recognizes devices it syncs with? Thank you!

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