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• Using Windows Explorer, how to find file names starting with a dot (period), in 7 or Vista?

  - by Chris W. Rea

  I've got a MacBook laptop in the house, and when Mac OS X copies files over the network, it often brings along hidden "dot-files" with it. For instance, if I copy "SomeUtility.zip", there will also be copied a hidden ".SomeUtility.zip" file. I consider these OS X dot-files as useless turds of data as far as the rest of my network is concerned, and don't want to leave them on my Windows file server. Let's assume these dot-files will continue to happen. i.e. Think of the issue of getting OS X to stop creating those files, in the first place, to be another question altogether. Rather: How can I use Windows Explorer to find files that begin with a dot / period? I'd like to periodically search my file server and blow them away. I tried searching for files matching ".*" but that yielded – and not unexpectedly – all files and folders. Is there a way to enter more specific search criteria when searching in Windows Explorer? I'm referring to the search box that appears in the upper-right corner of an Explorer window. Please tell me there is a way to escape my query to do what I want? (Failing that, I know I can map a drive letter and drop into a cygwin prompt and use the UNIX 'find' command, but I'd prefer a shiny easy way.)

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• Sever 2008 R2 Powershell Script runs manually, but not as a scheduled task

  - by Aeisor

  I have a Powershell script that runs manually using the Powershell ISE; However, when run as a scheduled task using an administrator's credentials the task does not run with the expected results. The script: $request=new-object System.Net.WebClient $request.DownloadFile("...url...", "C:\path\to\file.csv") The administrator user has Full Control of both the script and the folder it is writing to. The url exists and responds in a reasonable time (<1s). If I run the task manually the status is 0x41301 ("Currently Running") until I eventually end it. I have set the task up using both of these methods: Start a Program: C:\path\to\PS.PS1 Start a Program: C:\windows\system32\WindowsPowerShell\v1.0\powershell.exe with additional options -noninteractive -command "C:\path\to\PS.PS1" Using option 1, the task history shows it has opened an instance of notepad.exe but never terminates it. Using option 2 it completes the task but doesn't download / create the file. I have used Set-ExecutionPolicy Unrestricted as this is not a signed script. Any ideas?

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• MySQL reserves too much RAM

  - by Buddy

  I have a cheap VPS with 128Mb RAM and 256Mb burst. MySQL starts and reserves about 110Mb, but uses not more than 20Mb of them. My VPS Control Panel shows, that I use 127Mb (I also running nginx and sphinx), I know, that it shows reserved RAM, but when I reach over 128Mb, my VPS reboots automatically every 4 hours. So I want to force MySQL to reserve less RAM. How can i do that? I did some tweaks with my.conf but it helped not so much. top output: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1 root 15 0 2156 668 572 S 0.0 0.3 0:00.03 init 11311 root 15 0 11212 356 228 S 0.0 0.1 0:00.00 vzctl 11312 root 18 0 3712 1484 1248 S 0.0 0.6 0:00.01 bash 11347 root 18 0 2284 916 732 R 0.0 0.3 0:00.00 top 13978 root 17 -4 2248 552 344 S 0.0 0.2 0:00.00 udevd 14262 root 15 0 1812 564 472 S 0.0 0.2 0:00.03 syslogd 14293 sphinx 15 0 11816 1172 672 S 0.0 0.4 0:00.07 searchd 14305 root 25 0 7192 1036 636 S 0.0 0.4 0:00.00 sshd 14321 root 25 0 2832 836 668 S 0.0 0.3 0:00.00 xinetd 15389 root 18 0 3708 1300 1132 S 0.0 0.5 0:00.00 mysqld_safe 15441 mysql 15 0 113m 16m 4440 S 0.0 6.4 0:00.15 mysqld 15489 root 21 0 13056 1456 340 S 0.0 0.6 0:00.00 nginx 15490 nginx 18 0 13328 2388 992 S 0.0 0.9 0:00.06 nginx 15507 nginx 25 0 19520 5888 4244 S 0.0 2.2 0:00.00 php-cgi 15508 nginx 18 0 19636 4876 2748 S 0.0 1.9 0:00.12 php-cgi 15509 nginx 15 0 19668 4872 2716 S 0.0 1.9 0:00.11 php-cgi 15518 root 18 0 4492 1116 568 S 0.0 0.4 0:00.01 crond MySQL tuner: >> MySQLTuner 1.0.1 - Major Hayden <[email protected]> >> Bug reports, feature requests, and downloads at http://mysqltuner.com/ >> Run with '--help' for additional options and output filtering Please enter your MySQL administrative login: root Please enter your MySQL administrative password: -------- General Statistics -------------------------------------------------- [--] Skipped version check for MySQLTuner script [OK] Currently running supported MySQL version 5.0.77 [OK] Operating on 32-bit architecture with less than 2GB RAM -------- Storage Engine Statistics ------------------------------------------- [--] Status: -Archive -BDB -Federated +InnoDB -ISAM -NDBCluster [--] Data in InnoDB tables: 1M (Tables: 1) [OK] Total fragmented tables: 0 -------- Performance Metrics ------------------------------------------------- [--] Up for: 38m 43s (37 q [0.016 qps], 20 conn, TX: 4M, RX: 3K) [--] Reads / Writes: 100% / 0% [--] Total buffers: 28.1M global + 832.0K per thread (100 max threads) [OK] Maximum possible memory usage: 109.4M (42% of installed RAM) [OK] Slow queries: 0% (0/37) [OK] Highest usage of available connections: 1% (1/100) [OK] Key buffer size / total MyISAM indexes: 128.0K/64.0K [OK] Query cache efficiency: 42.1% (8 cached / 19 selects) [OK] Query cache prunes per day: 0 [!!] Temporary tables created on disk: 27% (3 on disk / 11 total) [!!] Thread cache is disabled [OK] Table cache hit rate: 57% (8 open / 14 opened) [OK] Open file limit used: 1% (12/1K) [OK] Table locks acquired immediately: 100% (22 immediate / 22 locks) [!!] Connections aborted: 10% [OK] InnoDB data size / buffer pool: 1.5M/8.0M -------- Recommendations ----------------------------------------------------- General recommendations: MySQL started within last 24 hours - recommendations may be inaccurate Enable the slow query log to troubleshoot bad queries When making adjustments, make tmp_table_size/max_heap_table_size equal Reduce your SELECT DISTINCT queries without LIMIT clauses Set thread_cache_size to 4 as a starting value Your applications are not closing MySQL connections properly Variables to adjust: tmp_table_size (> 32M) max_heap_table_size (> 16M) thread_cache_size (start at 4) I think if I do what MySQLtuner says, MySQL will use more RAM.

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• Why are SIP calls via my server silent?

  - by Archcode

  I have FreeSWITCH SIP server up and running. It has public IP and sits behind 1-to-1 NAT (it's Amazon EC2 instance actually). I can connect to it, make a call to other endpoint (namely, my android device to my pc and vice versa) and signals are send with no problems (call, answer, hangup, etc). Unfortunately, and what drives me crazy, that's all: no audio gets through, no video either. Server does not throw errors, it reports many retransmission though, looks like this: switch_rtp.c:915 [ zrtp engine]: WARNING! HELLO Max retransmissions count reached (20 retries). ID=15 Codecs are set up correctly (same config worked locally on my LAN). NAT/firewall on client side may be a problem, signals do get through (perhaps due to fixed port, data streaming runs on random one, that is currently my best bet). STUN/TURN/ICE setting on client seem to have no effect. Endpoints sit behind symmetric NAT. On server there are no iptables rules, security group is set as suggested there: http://wiki.freeswitch.org/wiki/Firewall Help, please. How to make it work or at least diagnose what's wrong?

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• Who should I run mysql as, on a personal computer?

  - by user664833

  I just installed mysql via homebrew (with brew install mysql, on Mac OS X Mountain Lion - recently installed from scratch). Following the installation, there is a "caveats" section with options around further necessary actions to take: ==> Caveats Set up databases to run AS YOUR USER ACCOUNT with: unset TMPDIR mysql_install_db --verbose --user=`whoami` --basedir="$(brew --prefix mysql)" --datadir=/usr/local/var/mysql --tmpdir=/tmp To set up base tables in another folder, or use a different user to run mysqld, view the help for mysqld_install_db: mysql_install_db --help and view the MySQL documentation: * http://dev.mysql.com/doc/refman/5.5/en/mysql-install-db.html * http://dev.mysql.com/doc/refman/5.5/en/default-privileges.html To run as, for instance, user "mysql", you may need to `sudo`: sudo mysql_install_db ...options... Start mysqld manually with: mysql.server start Note: if this fails, you probably forgot to run the first two steps up above A "/etc/my.cnf" from another install may interfere with a Homebrew-built server starting up correctly. To connect: mysql -uroot To launch on startup: * if this is your first install: mkdir -p ~/Library/LaunchAgents cp /usr/local/Cellar/mysql/5.5.27/homebrew.mxcl.mysql.plist ~/Library/LaunchAgents/ launchctl load -w ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist * if this is an upgrade and you already have the homebrew.mxcl.mysql.plist loaded: launchctl unload -w ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist cp /usr/local/Cellar/mysql/5.5.27/homebrew.mxcl.mysql.plist ~/Library/LaunchAgents/ launchctl load -w ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist You may also need to edit the plist to use the correct "UserName". On previous versions of Mac OS X I ran mysql as mysql user, but now I am confronted by the idea of running it as myself. I am the only one who uses this computer (which happens to be my laptop), and I do programming for work and for pleasure. What are the pros & cons, or best practices, around choosing whether to run mysql AS YOUR USER ACCOUNT or as mysql or something else still?

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• How to remotely connect using perfmon?

  - by user36914

  Suprised there is not a ton of information on google when i search for this but there is not. Lot of people asking the question but i none of them have any good answers. I have a remote computer running hyper-v (server) running a Windows 7 x64 guest (guest). Occasionally i won't be able to remote desktop to guest. I will then remote to server and see that the guest instance is constantly using about 25% of the cpu. WHen i try to connect directly from server i will get the login screen but as soon as i type the password in it will just stay at the windows 7 login screen but the account names will disappear and it will not log in. It responds to pings though. I don't know how else to diagnose other than trying to run perfmon remotely. It only happens like every 3 weeks and i run it 24/7. So i'm trying to run remote desktop remotely. I tested this out on a local vm i have running under vmware. When i try to connect using perfmon to my local vm i get this error: "when attempting to connect to the remote computer the4 following system error occurred: the network path was not found" I found in another past to start the remote registry service and when i start the service i get this error: "No such interface supported" Anyways, how do i remotely connect to another machine with perfmon or if anyone has a better idea how i can diagnose the problem above then let me know.

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• Apache + Tomcat: Which one should handle SSL? IP-based proxy forwarding?

  - by delirial

  We currently have a Tomcat application running with SSL on port 443. Right now we have an apache server that accepts http requests on port 80 and redirects to the Tomcat instance: <VirtualHost *:80> ServerName domain.com ServerAlias domain.com <LocationMatch "/"> Redirect permanent / https://domain.com/ </LocationMatch> </VirtualHost> Tomcat is handling SSL, because there's no proxy, just a simple redirect to the SSL port: <Connector port="443" maxThreads="200" scheme="https" secure="true" SSLEnabled="true" keystoreFile="/app/ssl/domain_com.jks" keystorePass="ourpassword" clientAuth="false" sslProtocol="TLS"/> We want to begin using the apache web server as a proxy and additionally, do per-IP redirects to certain apps that should only be used by hosts on a pre-determined IP range. We would also like to redirect IPs that don't match the pre-determined list to a static html page hosted on the apache server. My first question is: Should I continue to handle SSL on Tomcat's end, or should I use apache with SSL while forwarding to an "unprotected" tomcat port? Is there any way to redirect to different apps (and potentially hosts) depending on the incoming IP? thanks, del

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• Run a rails server on Amazon EC2 [on hold]

  - by Jashwant

  Context: I've tried rubber gem, but that does not fulfill my requirements ( I needed to deploy on existing instance, so don't recommend me rubber) So, I followed this excellent tutorial http://stackoverflow.com/questions/15535140/installing-ruby-2-0-and-rails-4-0-0beta-on-aws-ec2 Now, I have ruby 2.0 and rails 4.0.0 running on AWS EC2. I successfully ran the server with RDS (mysql) as db and default webrick as server ( Using command rails server ) But, I've read that webrick is a development server and shouldn't be used at production. What I tried: I googled and came up with some alternatives. Capistrano Nginx / apache with passenger Passenger with Capistrano Unicorn Puma My Question: What exactly is capistrano / passenger ? Are they middleware to ease my deployment process ? I don't see any difficulty in doing rails server command. If they are just middleware, nginx with passenger and capistrano does not make any sense ? Why would I add a learning curve ( to learn nginx, passenger and capistrano configs) just to run my server ? I can just use nginx to deploy my app. Can't I ? What combination should I use on Amazon EC2 (or may be at any some other production server).

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• Measuring performance indicators on a cluster

  - by Aditya Singh

  My architecture is based on Amazon. A ELB load balancer balances POST requests among m1.large instances. Every instance has a nginx server on port 80 which distributes the requests to 4 python-tornado servers on backend which handle the request. These tornado servers are taking about 5 - 10ms to respond to one request but this is the internal compute time of every request. I want to put this thing on test and i want to measure the response time from ELB to upstream and back and how does it vary when the QPS throughput is increased and plot a graph of Time vs. QPS vs. Latency and other factors like CPU and Memory. Is there a software to do that or should i log everything somewhere with latency checks and then analyze the whole log to get the stuff out. I would also need to write a self-monitor which keeps checking the whole response time. Is it possible to do it with a script from within the server. If so, will it be accurate ?

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• Problem running “Central Administration” website after windows update at Windows 2003 Server Standar

  - by Magdy Roshdy

  I was have WSS 2.0 and then I upgraded to WSS 3.0 and the old instalation database was SQL 2000, now I have another SQL Server instance called:server_name\MICROSOFT##SSEE . After upgrade every thing works fine and our team started to use the portal and we sent lot of documents and make lot of activities on it. The problem started after installing Windows updates the website suddenly stopped and giving me an error "Cannot connect to the configuration database" If I tried to open SharePoint Products and Technologies Configuration Wizard it is gives me a strange error says: "An exception of type Microsoft.SharePoint.PostSetupConfiguration.PostSetupConfigurationTaskException was thrown. Additional exception information: SharePoint Products and Technologies cannot be configured. The current installation mode does not support SKU to SKU upgrades because there exists an older version of Windows SharePoint Services that must be upgraded first " At this post:http://stackoverflow.com/questions/114398/iis-error-cannot-connect-to-the-configuration-database/249494#249494 the guy of the second answer have the same problem and he suggested a solution but I don't understand well. I tried as he suggested to make the identity of the app pool of the SharePoint web site as "IWAM_server_name " after that the error changed as he said and I web site give me "Server Application Unavailable " and when checked the Event Viewer at the server I found that ASP.NET 2.0 give this exception: "Could not load file or assembly 'System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. Access is denied ." and I don't know how to solve this problem. I'm really want to make my web site working because our team really need these documents and its stuff. I hope I will find some one to help me.

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• Migrating WebLogic 10.3.0 to new host. Slow managed server startup times

  - by wadevondoom

  We are migrating our Blue Martini Commerce application (only supported on WebLogic 10.3.0) to a new host (Redhat 6.3 on a VMWare ESX vm). We are seeing extremely slow start up times for our managed server(s) that is basically 20x slower than our current production. As a for instance the Publish managed server takes ~30 - 45 seconds in current production and in the new environment it takes ~10 minutes. The setup uses the same domain structure and JVM as the current production environment. The same setup files are used. We use jdk1.6.0_33 on 64 bit architecture. We used the generic 64bit weblogic installer and used pack / unpack utilities to migrate the domain. The JAVA_OPTS to start this server are: "-d64 -Xms256m -Xmx512m -XX:PermSize=48m -XX:MaxPermSize=256m" The sysadmins have checked /etc/sysctl.conf and /etc/limits.conf to ensure we were not hitting some kind of process limit. As I am not sure what this managed server does from a Blue Martini perspective during the phase of startup I also had the DBA check to ensure that Oracle RAC (11.2.0.3) wasn't also hitting some kind of process limit or if there was a tns listener issue. The new host is quite a bit stricter with their server lock downs so there are a few differences.... Redhat 6.3 in new env, RH 5.7 in current SElinux is targeted in new env and disabled in current VM in new env and dedicated hardware in current iptables disabled in current. It was enabled in new prod but I had them disable it just in case I apologize for not being more specific. I am mostly hoping got some tips. I do not have the typical root access I would normally have in this environment. I am just hoping got a path forward. I did a few 'kill -3' to see if there are blocked threads and I got nadda. The service works for all intents and purposes it is just painfully slow. Thanks you all in advance for reading and best regards. Wade

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• Can't access site internally, but DNS works

  - by BloodyIron

  1) I have apache2 running a vhost for a website. 2) This apache2 instance is already successfuly setup for other websites on it to be accessible internally and externally. 3) I am using an internal bind9 server to resolve the new website's domain internally to the private IP. This bind9 server is not public facing, nor is it the master server on the internet. 4) The DNS internally resolves to the right IP. 5) Firefox reports "server not found". 6) I have copied the config almost identically to other configs that are known to work (adjusting for proper paths of course). In turn I have reloaded and restarted apache2 repeatedly. 7) I have an entry to forward .org .info .net alternative TLDs to .com in the vhost config for this domain, and my browser goes from .org to .com despite note #5. 8) /var/log/apache2/access.log shows when someone externally tries to access the site, but no activity is observed when someone tries to access internally. Changing the log level does not appear to improve the situation. 9) I am out of ideas, nothing appears to be wrong. Please help? To be explicit. Why is this new site unreachable internally? I would like to clarify on something, even though I have already outlined this. YES I know this system is in a private network. NO it is not going through a router. YES I am using an internal DNS server (bind9) to resolve, and YES it does resolve to the proper internal IP. YES other websites on the same server setup in the same way with internal resolution work right now and have done for a while. Everything for this domain is setup the same as the other working domains as far as I can tell. The other working domains are internally AND externally accessible. This domain I am working with is only currently externally accessible. When I go to it internally firefox tells me "Server not found".

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• postfix test and configuration problem

  - by Woho87

  Hi Guys! I installed postfix using sudo yum install postfix postfix-mysql. I'm newbie to mail systems, but I have one AMAZON EC2 instance with a public DNS. I used the public DNS in most cases, when I configured the file main.cf. The public DNS I have is from amazon and it is a long string(ec2-123-34-234-677.....amazon.com). // I configured this on main.cf. I replaced example.com with ec2-123-.......amazon.com myhostname = mail.example.com mydomain = example.com myorigin = $mydomain mydestination = example.com, $transport_maps local_recipient_maps = $alias_maps $virtual_mailbox_maps unix:passwd.byname home_mailbox = Maildir/ How do I test postfix? I just want it to send emails for my web application. I tried to test it with >telnet localhost 25 after I typed in SSH >sudo postfix start. but I recieve the message that telnet command can not be found. I also use the Amazon linux distribution if you want to know. I use it because it is free. What have I done wrong? Are there anymore configurations required pls help!

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• EC2 kernel decision and issues with creating a new machine with my AMI

  - by roacha

  I could really use some advice. I started a new instance on EC2 using Amazon's AMI and during the deployment process I selected a Kernel ID of "Use Default". I then configured my server the way that I wanted to and took a snapshot of it. I then created my own AMI to create new servers with. When I try and create a new server with this AMI the server fails to start and I get the error: EXT3-fs: sda1: couldn't mount because of unsupported optional features (240). Which appears to happen because I am selecting a kernel id of "Use default" again when building my second server. I have read that in order for this to work I need to choose the same kernel id that was used in my original server. I have deleted my original server and don't know what it was using. What is the best process to follow in order to not have these issues? Should I choose "Use Default" for my original server? How do you know which kernel it selected? Then should I just document this and always specify this during the deployment of my next servers using my custom AMI? OR should I choose a custom kernel id during the initial build and always use this one moving ahead hoping Amazon never retires it? Thanks for any advice!

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• Joomla performance problems on AWS

  - by Bobby Jack

  I'm running a site on AWS with the following setup: Single m1.small instance (web server) Single RDS m1.small db Joomla 1.5 Generally, the site is performant, but is fairly low-traffic - say around 50-100 visits / hour. However, at peak time, we see about double that traffic. During peak time, pretty much every day: CPU usage on the web server slowly climbs to 100% CPU usage on the RDS server climbs quite quickly to about 30%, from an average of about 15 Database connections shoot up to about 140, from a normal average of about 2 or 3 The site is then occasionally unreachable, certainly according to pingdom monitoring. Does anyone recognise this behaviour? Can you point me in the right direction to begin investigating? Of course, RDS makes it difficult to do things like slow query logging, so I've started by regularly dumping the mysql process list into a file to see if there's anything I can spot there, but it would be good to have something more concrete to investigate. UPDATE At least, can someone confirm that I'm definitely right in saying that the level of traffic implies the problem must be a specific type of query taking way longer than it should to execute? This would happen if a table gets locked, and many queries need to write to it, right? For this very reason, I've already changed the __session table type to InnoDB.

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• Allowing access to company files accross the internet

  - by Renaud Bompuis

  The premise I've been tasked with finding a solution to the following scenario: our main file server is a Linux machine. on the LAN, users simply access the files using SMB. each user has an account on the file server and his/her own access rights. user accounts are simple passwd/group security accounts, not NIS/LDAP. The problem We want to give users (or at least some of them, say if they belong to a particular group) the ability to access the files from the Internet while travelling. Ideally I'd like a seamless solution. Maybe something that allows the user to access a mapped drive would be ideal. A web-oriented solution is also good but it should present files in a way that is familiar to users, in an explorer-like fashion for instance. Security is a must of course, and users would be expected to log-in. The connection to the server should also be encrypted. Anyone has some pointers to neat solutions? Any experiences? Edit The client machines are Windows only.

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• How to provide users with isolated drive letters in Windows 2008 R2 (Terminal Server)

  - by Pierre

  I need to be able to host several RDP sessions on a Terminal Server, where users of group A see a drive X: mapped to a given folder of the server and another group B see the same drive letter X: mapped to another folder. For instance : User 1, Group A X: --> C:\data\A User 2, Group A X: --> C:\data\A User 3, Group B X: --> C:\data\B User 4, Group C X: --> C:\data\C Is this possible. If so, how do I configure the virtual drive mapping so that the user has nothing special to do; i.e. I want the letter X: to be available to Remote Apps launched by the user, or if the user logs in to the remote desktop. Can I somehow use subst to get this to work? I would like to avoid, if possible, mounting drive letters on local shares (i.e. I don't like the idea of having to go through \\localhost\data-A to reach the user's data).

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• In which order does Excel process its formulae?

  - by dwwilson66

  I've got a fairly large spreadsheet with major calculations going on, and it's starting to slow down every time a value that's part of a calculated field is modified. I'm in the process of optimizing the file, adding arrays where I can, and seeing where I can shave off a few milliseconds here and there. Let's say there's data in Columns A-H. Column H is set based on relationships between values in Columns A, B and C, which change dynamically from an outside program. Users enter the data in Column F. Formulas in D & E calculate relationships between F & H and H & D, respectively. How does Excel manage formulae in the case, for instance, where they're dependent on data further into the sheet? Will my value in H be available the first time that the formulae in D & E calculate? or, will D & E calculate based on an old value for H, because H's update hasn't happened yet? Are there any efficiencies to be gained by positioning dependencies in particular rows or columns in the speadsheet? Do positions above and left the current position get processed sooner than things below and to the right?

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• How is network mounted software executed?

  - by CptSupermrkt

  I would like to understand how network mounted software works. For example, at my place of work, we have a software server. Each client machine (hundreds of them) automatically mounts directories from the software server on boot. For example, a program like Matlab is installed just once on the software server, but each client machine can start up an instance of Matlab. What is going on under the hood? Let's say I run /opt/bin/matlab and /opt/ is mounted from the software server, what happens when I press Enter to execute matlab on a client machine? The process is on the client machine, and I've already narrowed down that there isn't any implicit or hidden file transfer (i.e. copying matlab to my machine temporarily for that session) by running matlab on a computer with nearly zero disk space (i.e. not enough room to transfer). Since Matlab was installed on the server, how is my client computer executing it? What mechanism is controlling this? What is happening behind the scenes?

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• Cache Control Headers with IIS 7.5

  - by Brad

  I'm trying to wrap my head around client side (web browser) caching and how it works in relation to IIS 7.5 cache control headers. In particular: If we want to force clients to reload cached resources, how must IIS be configured? Do we need to set expire web content immediately if the resources on the server have a more recent Modified Date (or ETag value)? Right now we're not setting any cache headers. So if I set a cache header of no-cache (which I think is the equivalent of expire web content immediately) will that force the web browser to obtain a new version of a particular file. Or will the browser only request a new version after it deems its current copy to be stale and then from that point forward not cache it? Would a best practice be to set a cache control flag of 1 week, then 8 days before I know I am going to make a change set the cache control down to for instance 30 minutes? But if I do that and then need to immediately expire an item from users caches because there was an issue with it how do I do that?

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• Upgrading PHP, MySQL old-passwords issue

  - by Rushyo

  I've inherited a Windows 2k3 server running an XAMPP-installation from the stone age. I needed to upgrade PHP to facilitate an upgrade to MediaWiki to facilitate a new MediaWiki extension (to facilitate some documentation to facilitate doing my job to facilitate getting paid to facilit... you get the idea). However... installing a new version of PHP resulted in PHP's MySQL libraries refusing to communicate using MySQL's 'old style' 152-bit passwords. Not a problem in theory. The MySQL installation is post-4.1, so it should have the functionality to upgrade the user's passwords from 152-bit to 328-bit (what a weird hashing algorithm...). I ran the following: SET PASSWORD = PASSWORD('foo'); on MySQL but querying: SELECT user, password FROM mysql.user; returned just the same password I started out with - 152-bit. Now... I suspect you're thinking 'AHA! old-passwords is on!'. Unfortunately it's not - I've disabled it in the configuration (explicitly set it to 0), made doubly sure I have an absolute reference to that configuration file and ensured the service isn't using the --old-passwords flag. The service was reset after each and every operation. So I went onto another system and generated the 328-bit hash on there, copying the hash over to the first MySQL instance. Unfortunately, that didn't work either (I did remember to FLUSH PRIVILEGES). The application error is: "'mysqlnd cannot connect to MySQL 4.1+ using the old insecure authentication. Please use an administration tool [...snip...] Is there anything else I can try to get PHP to recognise MySQL as not using the 'old insecure authentication'? MySQL seems to be stuck in 'old-passwords' mode and I can't get it out of it.

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• Loadbalancing with nginx and tomcat

  - by London

  Hello this should be fairly easy to answer for any system admin, the problem is that I'm not server admin but I have to complete this task, I'm very close but still not managing to do it. Here is what I mean, I have two tomcat instance running on machine1 and machine2. People usually access those by visiting urls : http://machine1:8080/appName http://machine2:9090/appName The problem is when I setup nginx with domain name i.e domain.com, nginx sends requests to http://machine1:8080/ and http://machine2:9090/ instead of http://machine1:8080/ and http://machine2:9090/appName Here is my configuration (very basic as it can be noted) : upstream backend { server machine1:8080; server machine2:9090; } server { listen 80; server_name www.mydomain.com mydomain.com; location / { # needed to forward user's IP address to rails proxy_set_header X-Real-IP $remote_addr; # needed for HTTPS proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $http_host; proxy_redirect off; proxy_max_temp_file_size 0; proxy_pass http://backend; } #end location } #end server What changes must I do to do the following : - when user visits mydomain.com - transfer him to either machine1:8080/appName or machine2:9090 Thank you

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• WSUS performance for unneeded updates

  - by mhouston100

  We have a WSUS server serving around 300 PC's and a couple of dozen servers and a discussion came up at work as to what products to include. We have a single SQL 2005 instance on one of the servers and it has NEVER been updated. My first thought was to just tick the box for SQL 2005 and let WSUS do it's thing to upgrade to the latest service pack at least. One of the other guys here has the opinion that having updates that are relevant to only a small selection of hosts would effect the performance of WSUS as a whole, claiming that each update does a 'check' against all the hosts or something similar. My argument is that manually updating these servers is obviously not working as the admins are not paying attention to what is needed. So my question is: Do updates that only effect a sub-set of the hosts effect the overall performance of the WSUS server in relation to ALL the hosts? (disk space is not an issue at this point) Is there any performance justification for or against manually updating small amounts of products? Basically I'm needing a rebuttal against his argument and I'm unable to find any concrete documentation to prove him wrong.

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• Provider claiming "all web servers in the cloud are automatically kept in sync" - should I be skeptical?

  - by RobMasters

  I'm no expert in cloud computing - I've spent a fair bit of time researching it and various providers but am yet to get any hands-on experience with it. From what I've read about AWS and auto-scaling EC2 instances though, it seems as though each instance should be completely decoupled from all other instances. i.e. If content is uploaded to the web server's local filesystem from a custom CMS backend then that content won't be available if subsequently requested from a different web server in the auto-scaling group. Is that right? I met with a representative of our existing hosting provider recently and he was claiming that it isn't a problem that our legacy CMS system is highly dependent on having a local filesystem. He said that all web servers, regardless of how many, would be kept as exact duplicates so I shouldn't notice any difference compared to our existing setup of a single dedicated server. This smells a little too much like bull fecal-matter to me...should I be skeptical about this? I'm a little worried because my (non-technical) boss who ultimately makes the decisions is all for signing up to this cloud solution because it won't require any extra work. I'm sure that they must at least be able to provide this, otherwise they wouldn't be attempting to sell it to us. But at what cost? It sounds as though each web server will always need to be checking the other web server(s) for new static content, which to me sounds like unwanted overhead that'll slow things down. I'd really appreciate it if somebody could clear this up to me. I'm all for switching to AWS and using S3+CloudFront for all static content, but that isn't looking very likely to happen at the moment.

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• Apache suddenly very slow on http and faster on https

  - by hsnm

  Background: I have Apache 2 running on ubuntu. There is a low usage on it and mostly being accessed for a web service URL from mobile apps. It was working fine until I installed SSL certificates. I now have both http and https. When I access the server using https, I get a fairly quick response (but probably not as fast as before). When I use http, it's so slow. What I tried: From this post: I curl localhost from the host and it takes some time, meaning there is no routing issue. The server runs on Amazon EC2 instance and is managed by me only. Also: I see that Apache once running, creates the maximum number of processes it is allowed to, which was not the case before. I lowered the MaxClients to 20 and I think I'm getting faster responses but it still takes over a minute and I always have MaxClients Apache processes. dmesg returns many [ 1953.655703] TCP: Possible SYN flooding on port 80. Sending cookies. When I netstat I get many entries with SYN_RECV. Possibly a DDoS attack? From EC2's monitoring diagrams I see a pattern of high "Maximum Network In (Bytes)" since 2 days ago. By the way the server is still being tested, the actual traffic is very low and not consistent. I tried to go with this solution to limit incoming connections using iptables, still no luck, but I'm trying. Question: What could be the problem? Is this a DDoS attack?

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