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• Strange Inode/Ram cache drops happening in CentOS

  - by FunkyChicken

  I run a CentOS 5.7 machine (64bit) with 24GB ram and 4x SAS drives in RAID10 setup. This machine runs nginx/1.0.10, php-fpm & xcache. About a month back the RAM usage of this machine has changed. About every few hours the 'CACHE' is flushed from the RAM, this happens exactly when the 'Inode table usage' drops. I'm pretty sure these drops are related. (see the 2 attached images). This server hosts quite a lot of small files (20M all a few KB big). Not many files are deleted (maybe 100 per hour (total size a few MB max)), not enough to account for the huge Inode table drops. I also have no crons running which could cause these drops. Sar -r output: http://pastebin.com/C4D0B79i My question: Why are these huge RAM/Inode usage drops happening? How can I get Nginx/PHP to use all of my servers RAM?

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• How can I check Internet connectivity in a console?

  - by Ashfame

  Is there an easy way to check Internet connectivity from console? I am trying to play around in a shell script. One idea I seem is to wget --spider http://www.google.co.in/ and check the HTTP response code to interpret if the Internet connection is working fine. But I think there must be easy way without the need of checking a site that never crash ;) Edit: Seems like there can be a lot of factors which can be individually examined, good thing. My intention at the moment is to check if my blog is down. I have setup cron to check it every minute. For this, I am checking the HTTP response code of wget --spider to my blog. If its not 200, it notifies me (I believe this will be better than just pinging it, as the site may under be heavy load and may be timing out or respond very late). Now yesterday, there was some problem with my Internet. LAN was connected fine but just I couldn't access any site. So I keep on getting notifications as the script couldn't find 200 in the wget response. Now I want to make sure that it displays me notification when I do have internet connectivity. So, checking for DNS and LAN connectivity is a bit overkill for me as I don't have that much specific need to figure out what problem it is. So what do you suggest how I do it?

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• How do create an encrypted system with multiple Linux distributions?

  - by niels

  A few weeks ago I created a completely encrypted system on a notebook and must say I like the idea. It's a little bit annoying to enter the password on every boot, but it's nice to know even if I loose the computer I don't give my data to other people. With the alternate-cd it's easy to do. Now I have to setup a new system where I want to combine the new idea with my usual usage strategy. There I have more partitions: 3 system, Home, Different Data-Partitions for vm-data, photo-data and mp3-data. The background is that I prefer not to update a system. I prefer to install the new version parallel to the old system. So I can easily test it. Obviously the Data-Partitions are used for both systems. My questions is, how can I easily combine both my strategy and the crypto-approach? Or is it impossible. The way to do the crypted stuff by hand is in my eyes to complicated.

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• Does Dynamic DNS require separate subdomains?

  - by kce

  Hello. I have a functioning DHCP/DNS (ISC Bind 9.6, DHCP 3.1.1) server running on Debian that I would like to add DynamicDNS functionality to. I have a pretty simple question: Does DynamicDNS require (or recommend) separate sub-domains? I have seen a few tutorials where the the clients that are acquiring their IP addresses and other networking information via DHCP are on a different sub-domain as the servers which are statically configured (both in terms of IP, and DNS). For example: All the clients are on ws.example.org and the servers on example.org. Right now all of our servers and clients are in the same domain (example.org) but spread across different zone files (because we have multiple subnets). The clients are configured with DHCP and the servers are configured statically. If I want to setup DynamicDNS for the clients should I use a separate sub-domain? What's the best practice here (and why or why not would it be a bad idea to do otherwise)? Thanks.

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• How to design highly scalable web services in Java?

  - by Kshitiz Sharma

  I am creating some Web Services that would have 2000 concurrent users. The services are offered for free and are hence expected to get a large user base. In the future it may be required to scale up to 50,000 users. There are already a few other questions that address the issue like - Building highly scalable web services However my requirements differ from the question above. For example - My application does not have a user interface, so images, CSS, javascript are not an issue. It is in Java so suggestions like using HipHop to translate PHP to native code are useless. Hence I decided to ask my question separately. This is my project setup - Rest based Web services using Apache CXF Hibernate 3.0 (With relevant optimizations like lazy loading and custom HQL for tune up) Tomcat 6.0 MySql 5.5 My questions are - Are there alternatives to Mysql that offer better performance for what I'm trying to do? What are some general things to abide by in order to scale a Java based web application? I am thinking of putting my Application in two tomcat instances with httpd redirecting the request to appropriate tomcat on basis of load. Is this the right approach? Separate tomcat instances can help but then database becomes the bottleneck since both applications access the same database? I am a programmer not a Db Admin, how difficult would it be to cluster a Mysql database (or, to cluster whatever database offered as an alternative to 1)? How effective are caching solutions like EHCache? Any other general best practices? Some clarifications - Could you partition the data? Yes we could but we're trying to avoid it. We need to run a lot of data mining algorithms and the design would evolve over time so we can't be sure what lines of partition should be there.

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• CREDSSP 500 errors

  - by Andy Milsark

  Hello all, We are experience a 500 http error when trying to run remote powershell on a win 2008 R2 server. I have run enable-wsmancredssp for both client and server roles on this machine. I have also run "winrm quickconfig". Also the allowfreshcredentials delegation group policy is setup correctly as well. There are active listeners running and credssp is enabled for client and service. I can connect with kerberos (by not specifing authentication type), but the following remote powershell command fails: Enter-PSSession -ComputerName serverX -credential domain\user -Authentication Credssp Error: Enter-PSSession : Connecting to remote server failed with the following error message : The WinRM client received an HTTP server error status (500), but the remote service did not include any other information about the cause of the failure. For more information, see the about_Remote_Troubleshooting Help topic. At line:1 char:16 I have not been able to find any useful information on how to troubleshoot this. I have restarted Winrm, rebooted, disabled and re-enabled credssp. Please help.

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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 be able to forward all the traffic to one of these local address trhough the other interface. For instance, all requests to an iperf, ftp, http server at 192.168.1.1 are 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. 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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• Tiling window manager where dual heads share common workspace

  - by mikero

  I want to use a tiling window manager with my dual monitor setup, but almost all wms seem to treat each monitor as an independent workspace. This means that I can change the workspace of monitor 0 without affecting the workspace of monitor 1. This is not what I want -- I want a workspace to span both monitors, where each monitor is essentially a separate column for tiling (my monitors are oriented vertically, so they are well-suited as tiling columns). When I switch workspaces, say with Mod-[0-9], I want both monitors to change contents. So far the only wm I have found to support this is wmii, but I'd love to try some other options. Have I missed this capability from other tiling wms?

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• How to transfer files between a remote Linux machine and a local Windows machine?

  - by Lazer

  I need to transfer files/folders between a remote machine running Linux and my local machine running Windows XP. I usually access the remote machine through ssh, and sometimes use VNC sessions. What is the easiest way to transfer a file from the remote machine to my local machine and vice versa? I think ftp should be the solution. Is there a better way? If ftp is a good option, how do I initiate the transfer? Do I need to setup ftp servers on both the machines and then transfer? What exactly needs to be done?

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• Anonymous user with proftpd on fedora

  - by stukerr

  Hi there, I am trying to setup an anonymous user account on our server to enable people to downlaod technical manuals for our products etc. and I would like this to be as secure as possible! I was just wondering if anyone knew a series of steps that will allow me to create an anonymous ftp account linked to a directory on the server that enables download only ? Also how could i make a corresponding ftp account with write priviledges to this account to allow people within our company to upload new files ? Sorry i'm a bit new to all this! Many Thanks, Stuart

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• Controlling what data populates STAR

  - by user10747017

  Beginning with the Primavera Reporting Database 2.2\P6 Analytics 1.2 release, the first release that supported the P6 Extended Schema, a new ability was added to filter which projects could be included during an ETL run. In previous releases, all projects were included in an ETL run. Additionally, all projects with the option to enable publication are included in the ETL run by default.Because the reporting needs for P6 Extended Schema are different from those of STAR, you can define a filter that will limit the data that is included in the STAR schema. For example, your STAR schema can be filter to only include all projects in a specific Portfolio, or all projects with a project code assignment of 'For Analytics.'  Any criteria that can be defined in a Where clause and added to a view can be used to filter the projects included in the STAR schema. I highly suggest this approach when dealing with large databases. Unnecessary projects could cause the Extract portion of the ETL process to take longer. A table in STAR called etl_projectlist is the key for what projects are targeted during the ETL process. To setup the filter, perform the following steps:1. Connect to your Primavera P6 Project Management Database as Pxrptuser (extended schema owner) and create a new view:create or replace view star_project_viewasselect PROJECTOBJECTID objectidfrom projectportfolio pp, projectprojectportfolio pppwhere pp.objectid = ppp.PROJECTPORTFOLIOOBJECTIDand pp.name = 'STAR Projects'--The main field that MUST be selected in the view is the projectobjectid. Selecting any other field besides the projectobjectid will cause the view to be invalid and will not work. Any Where clause can be used, but projectobjectid is the key.2. In your STAR installation directory go the \res folder and edit the staretl.properties file.  Here you will define the view to be used.  Add the following line or update if exists:star.project.filter.ds1=star_project_view3. When running the  staretl.cmd or staretl.sh process the database link to Pxrtpuser will be accessed and this view will be used to populate the etl_projectlist table  with the appropriate projectobjectids as defined in the view created in step 1 above.

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• Autocomplete in Silverlight with Visual Studio 2010

  - by Sayre Collado

  Last week I keep searching on how to use the autocomplete in silverligth with visual studio 2010 but most of the examples that I find they are using a textbox or combobox for the autocomplete. I tried to study those examples and apply to the single autocomplete from tools on my silverlight project. And now this is the result. I will use a database again from my previous post (Silverlight Simple DataBinding in DataGrid) to show how the autocomplete works with database. This is the output: First, this is the setup for my autocomplete: //The tags for autocompletebox on XAML Second, my simple snippets: //Event for the autocomplete to send a text string to my function private void autoCompleteBox1_KeyUp(object sender, KeyEventArgs e) { autoCompleteBox1.Populating += (s, args) => { args.Cancel = true; var c = new Service1Client(); c.GetListByNameCompleted +=new EventHandler(c_GetListByNameCompleted); c.GetListByNameAsync(autoCompleteBox1.Text); }; } //Getting result from database void c_GetListByNameCompleted(object sender, GetListByNameCompletedEventArgs e) { autoCompleteBox1.ItemsSource = e.Result; autoCompleteBox1.PopulateComplete(); } The snippets above will show on how to use the autocompleteBox using the data from database that bind in DataGrid. But what if we want to show the result on DataGrid while the autocomplete changing the items source? Ok just add one line to c_GetListByNameCompleted void c_GetListByNameCompleted(object sender, GetListByNameCompletedEventArgs e) { autoCompleteBox1.ItemsSource = e.Result; autoCompleteBox1.PopulateComplete(); dataGrid1.ItemsSource = e.Result; }

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• Ho do you view all your monitoring software

  - by BLAKE

  In my office I have all our monitoring tools setup and working great, but I dont have an easy way to view them. I have a large TV in my office plugged into an old PC that has my nagios status page always showing. If I need to change anything on that computer I use Synergy to access the computer from my desktop. We are thinking about adding another TV and I want some suggestions on setting it all up. We are a 99.99% Windows shop. What do you use to run all the TV's in your helpdesk? Synergy works for me, but what if one of the other admins want to change the screen? Is there any easy way that any of us (currently 4 people) can change the screen from our desktops? (Remote desktop doesn't work because it locks the console which is the output to the TVs.) Any advice would help, Thanks.

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• Nodes inside Cisco VPN. Incoming SSH requests allowed. But can't initiate an outbound SSH.

  - by Douglas Peter

  I've a gateway-to-gateway VPN setup between my Linksys RV042 router and a Cisco VPN. I am able to SSH into any of the machine inside the VPN from my network. But none of the machines inside the VPN can initiate an SSH into my network. It seems they've blocked even all ping requests to my network gateway. This is the requirement: I have scripts that SSH into the machines inside the VPN and run a long mysql query. The query generates an output to a file. The time that these queries take is variable. So I have a loop in my machine that periodically SSHes into the VPN machine and checks if the query has finished, and pulls the generated file using SCP. I need to simplify it thus: The script will run at the machine inside the VPN, and when the query completes, it will SSH into my machine and pushes the generated file. Thanks for any ideas.

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• Multiple Users Sharing Email Accounts - How to make messages "unread" for each user?

  - by Ralph N

  Sorry if this isn't appropriate for webmasters stackexchange, but i'm not sure where it would go since it has to do with the logistics of setting up a website/email for a small company. I have an ecommerce store with multiple addresses such as: - [email protected] - [email protected] I'm not the only person managing the store. My partner and I both have those email accounts set up on each of our respective computers (right now it's using IMAP - he's on outlook and i'm on thunderbird). We have one major problem with this setup - If I read an email before he does, he doesn't know it ever arrived because the IMAP tells the server that the email has been "read". Of course, the same problem exists if he reads an email before I do. I understand that i can fix this problem by switching to POP3 and leaving the messages on the server. I'm okay with that... but it creates a NEW PROBLEM. If he replies to an email, it is no longer sync'd back to the server and therefore I can't read any emails that he has sent out. Same problem vice versa. This is also important for us because we want to know if one of us has already replied to an email so that the same thing isn't being done twice. With IMAP, all our sent emails are put in the Sent folder and synced to the server. What's a good way to set this up for a small company where email sharing is involved? My website is hosted on arvixe business ASP...

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• Is an Intel Atom D525 suitable to run MythTV

  - by Martin Thompson

  I have an oldish netbook with an Atom N450 (1.6GHz, 512KB cache) - I've been using it to experiment with MythTV, but it seems really slow, even just to work through the menus! Seconds, sometimes 10 or 20s, to load a new menu. Admittedly from a remote backend, but my older Core1 based laptop seems to be fine with the same setup. I was hoping to use one of the so-called "nettop" devices which currently seem to be D525-based (1.8GHz, 1MB cache) - is double the cache really going to make that much difference? Or has the internal architecture of the Atom moved on leaps and bounds in between? Given that I design non-Intel embedded computers for a living I was hoping to get lots of hardcore architecture detail from the Intel website, so I could see for myself, but I can't find it! So: will a D525 be fast enough to run a MythTV backend/frontend combined box?

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• Cannot boot into system after deleting partition

  - by Clayton

  Okay...so this was kind of a stupid thing for me to do now that I think back on it. I was experiencing a ton of lag and not as much memory that I could use after installing Ubuntu 12.04. So after remembering I had installed multiple server versions of Ubuntu 12.04 by mistake, I went into Disk Management and proceeded to delete each and every one. Everything went fine. Up until this week, I have not experienced any problems. But starting yesterday I began to get lag just as I had before, and nothing fixed the problem. I decided to remove the Ubuntu partition, since I was also experiencing a visual error when given the option to select one to boot(the screen doesn't come up at all, and I recieved a monitor resolution error instead, but could still access both Windows and Ubuntu via arrow keys). After deleting the Ubuntu partition, so that I could see if running just Windows would fix the problem, I proceeded with what I was doing, installing a few programs that were not tied to my prediciment in any way. Upon rebooting my desktop, however, I recieved the following error: error: unknown filesystem. grub rescue> Hoping I could boot into Ubuntu via a pendrive and possibly backup my important files and wipe the hard drive to start fresh, I installed Ubuntu 13.04, but even that does not boot. Instead, I get this message on a terminal screen: SYSLINUX 4.06. EDD 4.06-pre1 Copyright (C) 1994-2011 H. Peter Anvin et al ERROR: No configuration file found No DEFAULT or UI configuration directive found! boot: So more or less, my desktop is screwed. I need to be able to get to the files inside because of my job as an artist, as well as retrieve my documents for my stories stored on Windows. Once I can succeed in solving this once and for all, I know for a fact I will stick to Ubuntu only, and install what is required to be able to run any Windows applications I used to use or need to use. I would rather not reformat the hard drive, and if I need to, it is a last resort. And I doubt I can use a Windows Recovery Disk to get my files back, as my mom has thrown out a lot of the installation disks and paperwork I would need to even follow through with that. :\ Keep in mind that I am a novice/newbie when it comes to Linux, but am hoping ot become better at it as time goes by. I appreciate any help you guys can give me. This will probably be the last time I attempt to do anything that could risk the well-being of my PC. (I've also looked through various questions on the site and tested a lot of the solutions. None seem to have worked.)

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• Clustering in GlassFish with DCOM on Windows 7

  - by ByronNevins

  I've discovered that Windows 7 makes it very difficult to use DCOM and, mainly, the GlassFish clustering commands that rely on DCOM.  I spent a few days trying to solve the problems.  I don't yet have a cookbook for making DCOM work on Windows 7.  But here are a few tips and advice I've found. run asadmin setup-local-dcom -- It now comes automatically with the open source GlassFish 4.  It will write some critical registry entries for you.  run asadmin validate-dcom to test dcom 3.   When I ran validate-dcom on my Windows 7 network I saw the problem below: Successfully resolved host name to: gloin/10.28.51.10 Successfully connected to DCOM Port at port 135 on host gloin. Successfully connected to NetBIOS Session Service at port 139 on host gloin.Successfully connected to Windows Shares at port 445 on host gloin.Can not access the remote file system.  Is UAC on? : Access is denied. I discovered the actual problem is that Windows 7 no longer has the "C$" Administrative file share available by default. If "C$" isn't available then nothing will work. Here is how to expose the "C$" share: Registry Change -- this change allows “C$” to be accessed.  As soon as I set it -- the file copying started working!  [1] regkey: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System create this key, 32 bit word, with value == 1 LocalAccountTokenFilterPolicy 4.  Turn on the Remote Registry Service -- This is critical and it's easy to do. Windows 7 has it turned off by default. MyComputer-right click, manage, services, then turn on Remote Registry Service and set it to start automatically in the fture. 5. Turn off UAC: %systemroot%\system32\UserAccountControlSettings.exe 6. This is where I discovered that McAfee virus scanner blocks all the NetBios shares!  It has to be disabled.  

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• Can't install Windows 7 on Acer Aspire M1100

  - by r0ca

  When I install Windows 7, everything goes smooth but as soon as it's done and Windows needs to reboot for the last time before getting the desktop, the computer stucks to Verify DMI Pool Data............. and then, nothing. I change the CMOS battery, I tried so many setup in BIOS, even load default settings... Nothing worked. The HDD light is not flickering anymore, no HDD activity. CTRL-ALT-DEL doesn't work. It's just impossible to load Windows 7. I tried Windows XP and this works fine. I also tried the Acer (Futureshop) recovery CD and I get an Hexademical error message stating the install cannot continue. Is there a BIOS flash apps somewhere or a fix I can apply to have Windows 7 Ultimate installed on my computer. Any takers?

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• magento on Zend Server (Win7) installation error

  - by czerasz

  I try to install magento for the first time. I've created the database with the name "project" in my C:\Zend\Apache2\conf\httpd.conf I added on the end: <Directory "C:\Zend\Apche2\htdocs\project"> Options Indexes FollowSymLinks AllowOverride All Order allow,deny Allow from all </Directory> in my ZendServer/Server Setup/Extensions: PDO_MySQL, simplexml, mcrypt, hash, GD, DOM, iconv, curl, SOAP are on in C:\Zend\ZendServer\etc\php.ini I set: safe_mode = Off ;<-- was set to off ... memory_limit = 512M; Maximum amount of memory a script may consume (128MB) After step "Configuration" of magento installation (with Use Web Server (Apache) Rewrites enabled) I get: Internal Server Error My database is full of tables (that schould be ok) My Zend Server shows: 27-Oct 06:55 6 Severe Slow Request Execution (Absolute) http://localhost/project/index.php/install/wizard/installDb/ Critical Open 27-Oct 06:55 4 Fatal PHP Error C:\Zend\Apache2\htdocs\project\lib\Varien\Db\Adapter\Pdo\Mysql.php Critical Open 27-Oct 06:55 5 Slow Function Execution curl_exec Warning Open 27-Oct 06:55 5 Slow Request Execution (Absolute) http://localhost/project/index.php/install/wizard/configPost/ What can be wrong?

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• Windows 7 installation asks for DVD drivers

  - by koen

  I have installed Windows XP on my machine (Company CQ5020NL). Before I was able to do that, I set the SATA controller to IDE in the bios. Now I want to install Windows 7 upgrade. The DVD boots into the installation setup, but when I click "Install now" and am asked to load "A required CD/DVD drive device". When I click "Browse" I can browse the installation dvd and the drive I want to install to. I have tried all the SATA options in the bios already. I have no idea what to do... can anybody help me out?

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• Allow JMX connection on JVM 1.6.x

  - by Martin Müller

  While trying to monitor a JVM on a remote system using visualvm the activation of JMX gave me some challenges. Dr Google and my employers documentation quickly revealed some -D opts needed for JMX, but strangely it only worked for a Solaris 10 system (my setup: MacOS laptop monitoring SPARC Solaris based JVMs) On S11 with the same opts I saw that "my" JVM listening on port 3000 (which I chose for JMX), but visualvm was not able to get a connection. Finally I found out that at least my S11 installation needed an explicit setting of the RMI host name. This what finally worked:         -Dcom.sun.management.jmxremote=true \        -Dcom.sun.management.jmxremote.ssl=false \        -Dcom.sun.management.jmxremote.authenticate=false \        -Dcom.sun.management.jmxremote.port=3000 \        -Djava.rmi.server.hostname=s11name.us.oracle.com \ Maybe this post saves someone else the time I spent on research 

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• WS-AT Issue between WPS 6.2 and WAS 7.0

  - by AK

  Hi, I have a BPEL running on WPS 6.2 trying to call a web service on developed on RAD 7.5, deployed on RAD test environment. I have setup WS Transaction policy on both client and server. I get an error on WAS 7.0 saying Must Understand check failed for headers: {http:// schemas.xmlsoap.org/ws/2004/10/wscoor}CoordinationContext I tried to generate the same webservice on ibm wid 6.2 and deployed on EAR on WAS 7, it works perfect. Any thoughts ? Is there a SOAP runtime mismatch ? Help appreciated . -AK

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• Very slow disk performance on Dell PowerEdge 2950 w/ PERC 6/i running RAID 10

  - by vocoder

  I recently set up a server running Ubuntu 10.04 LTS on a Dell PowerEdge 2950 server - it has 6 500 gb 7200RPM SATA drives setup in a RAID 10 config. I am seeing extremely poor disk performance - the RAID array reports all disks are normal and using MegaCLI, it looks like the BBU is fine. hdparm -tT /dev/sda reports: Timing cached reads: 90 MB in 2.05 seconds = 43.96 MB/sec Timing buffered disk reads: 24 MB in 3.11 seconds = 7.72 MB/sec So as you can see, it takes forever to something as simple as an apt-get upgrade and even logging into the server. How do I go about troubleshooting what is causing this? I upgraded the firmware on the PERC 6i RAID controller to the latest, but didn't see any improvements.

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• How do I install and use Windows Virtual PC in Windows 8?

  - by KronoS

  I really like the integrated Virtual Machine that Windows had built-in with Windows 7 with Windows Virtual PC. I'm looking to install that again. I'd like to be able to install multiple machines as I did before (XP, Ubuntu, Etc,.) but I can't seem to find Windows Virtual PC for Windows 8 any more. Is it still available?, and if not was there something setup in place to replace it? How do I use it? NOTE TO ALL: While this is an accepted self posted answer feel free to edit, comment, or add an answer of your own. If your answer is better than mine, I will accept. This question was a Super User Question of the Week. Read the blog entry for more details or contribute to the blog yourself

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