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• Correlating %RDY in esxtop to CPU Usage in Guest

  - by Joe

  We recently upgrade a number of our VmWare hosts from 4.1 to 5.5 and noticed many of the VMs saw a step-wise jump in CPU usage as shown by the guest VM. We have not yet upgraded vmwaretools on any of the guests, but after investigating a bit more we saw many of these guests with a high %RDY value (50%) when viewed under esxtop. Unfortunately Linux (the guest) just shows "high CPU usage" without any insight into what portion of that is coming from %RDY (VmWare saying, "your guest is waiting on CPU from the host"). Are there any tools, /proc entries, etc. that can shed light on that information?

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• centos how to install systemtap

  - by Mingfei.hua

  I'm really new to sysmtemtap. just want to install and try systemtap on my lab server. My Linux release version is centos 6.3 and kernel version 2.6.32-279.5.2.el6.i686. I followed some doument, do yum install kernel-devel yum install kernel-debuginfo yum install systemtap all completed without error or warning. but when I try to test systemtap by stap -v -e 'probe vfs.read {printf("read performed\n"); exit()}' I got error Pass 1: parsed user script and 83 library script(s) using 25180virt/14088res/2684shr kb, in 120usr/10sys/161real ms. semantic error: missing i386 kernel/module debuginfo under '/lib/modules/2.6.32-279.5.2.el6.i686/build' while resolving probe point kernel.function("vfs_read")

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• Dawn of the Enterprise Social Developer

  - by Mike Stiles

  Social is not just for poking friends, posting videos of cats playing pianos, or even just for brand marketing anymore. It has become a key form of communication internally and externally across every area of the enterprise. As a Java developer, are you positioning yourself for the integration of social into enterprise business systems that’s on the near horizon? Because it’s the work you do and the applications you build that will influence what the social-enabled enterprise is going to look like and how it’s going to operate. But as a social developer, step one is wrapping your arms around all the things that are possible. Traditionally, the best exploration, brainstorming and innovation come from collaborating with other developers. That’s how the big questions can be hashed (or hacked) out. Is Java the best social development environment? If not, what is? What’s already being done in terms of application integration? The JavaOne Social Developer Program will offer up a series of talks and events on those very issues Tuesday, October 2 at the San Francisco Hilton. If you’re interested in embarking on this newest frontier of enterprise social development, you can connect with others who are thinking the same thing and get moving on your first project.Talks will include: Emergence Of The Social EnterpriseExtending Social into Enterprise Applications and Business ProcessesIntro to Open Graph and Facebook's APIs Building the Next Wave of Social Commerce Platforms Social Data and the Enterprise LinkedIn: A Professional Network Built with Java Technologies and Agile Practice Social Developer Hackathon In addition to these learning and discussion opportunities, you might consider joining the new Oracle Social Developer Community (OSDC), where the interaction and collaboration can continue indefinitely. It doesn’t take a lot of tea leaf reading to know that the cloud will house the enterprise technology of the future, and social (as well as the rich data it brings) is going to be a major part of that as social integrates across every business function as there’s proven value for consumer facing initiatives. The next phase of social development is going to involve combining enterprise data from multiple sources, new and existing, social and traditional, in order to tell compelling and usable stories. And social is coming to the enterprise quickly, meaning you as a development leader should seek to understand not just what's worked on the consumer side, but what aspects of those successes can be applied inside the organization. Get educated, get connected, and consider registering for this forward-looking event now to get started with enterprise social development.

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• Multi-monitor aterm transparency

  - by Bryan Ward

  I have 3 monitors which I set the background with using xpmroot my-5760x1200bg.png I then setup aterm to use transparency by adding the following to my ~/.Xdefaults file. aterm*transparent:true aterm*shading:60 aterm*background:Black aterm*foreground:White aterm*scrollBar:true aterm*scrollBar_right:true aterm*transpscrollbar:true aterm*saveLines:32767 aterm*font:*-*-fixed-medium-r-normal--*-140-*-*-*-*-iso8859-1 aterm*boldFont:*-*-fixed-bold-r-normal--*-*-140-*-*-*-*-iso8859-1 I am getting transparency on my aterm windows, but the image that is coming through with the transparency isn't correct. On the left monitor things are fine, but the middle and right monitors both seem to use the leftmost 1920x1200 of the background image as what is behind the terminal window. It would be as if every screen had the same background as the monitor on the left. Is this something that can be configured to be correct, or is this a bug? I'm running Gentoo Linux with Xmonad.

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• Bash - Program is writing directly to terminal

  - by Salis

  Valve's dedicated server for the Source Engine (srcds_run) on Linux writes directly to the terminal, not stdout. I want to run it as an /etc/init.d daemon on Debian 6, and I'd like to redirect/capture the output to a file. How can I do that? And better yet, why would they output directly to the terminal, is there any benefit in doing that? I suppose I could start another bash instance just for srcds_run, but that seems like a dirty solution, and I still don't know how to redirect the output.

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• fsck: FILE SYSTEM WAS MODIFIED after each check with -c, why?

  - by Chris

  Hi I use a script to partition and format CF cards (connected with a USB card writer) in an automated way. After the main process I check the card again with fsck. To check bad blocks I also tried the '-c' switch, but I always get a return value != 0 and the message "FILE SYSTEM WAS MODIFIED" (see below). I get the same result when checking the very same drive several times... Does anyone know why a) the file system is modified at all and b) why this seems to happen every time I check and not only in case of an error (like bad blocks)? Here's the output: linux-box# fsck.ext3 -c /dev/sdx1 e2fsck 1.40.2 (12-Jul-2007) Checking for bad blocks (read-only test): done Pass 1: Checking inodes, blocks, and sizes Pass 2: Checking directory structure Pass 3: Checking directory connectivity Pass 4: Checking reference counts Pass 5: Checking group summary information Volume (/dev/sdx1): ***** FILE SYSTEM WAS MODIFIED ***** Volume (/dev/sdx1): 5132/245760 files (1.2% non-contiguous), 178910/1959896 blocks Thanks, Chris

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• remote desktop to Fedora 20 with xrdp

  - by 5YrsLaterDBA

  I was able to setup xrdp on my Fedora 13 machine and access it from my Windows 7 machine by follow the steps on the first post on this thread It was simple and easy. But when i try the same on my Fefora 20 machine, things are quite different. There is no error message but some new info like these: # chkconfig --levels 35 xrdp on Note: Forwarding request to 'systemctl enable xrdp.service'. # service xrdp start Redirecting to /bin/systemctl start xrdp.service and then I cannot remote it from my window machine. I also did the following based on the last post of above threa: # yum -y install tigervnc-server Any configuration I should do to make xrdp works for me? I was able to ping each other. EDIT: I can access the shared folder on my Windows machine from my Fedora 20. It seems the problem is on the Fedora side. how to know the service on linux is running? The "service --status-all" cannot give me useful information.

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• Snapshot/rollback for libvirt+KVM?

  - by jtimberman

  I've recently begun using KVM for my development/test environment on a Linux host system with 8G memory. Prior, I was using VMware Fusion for my virtual environment, but my Macbook only has 2G memory. I tried VMware Server and ESX on the host instead of KVM, but the webUI doesn't run on Mac OSX's Firefox, and we're going to be doing more with KVM anyway. The main feature of VMware I miss is robust snapshot/rollback, but I'm missing this in KVM. I understand the snapshot command, but it shuts down the guest OS when complete, and then copying the disk image to preserve its state is cumbersome. Is this really the best way to manage snapshots on KVM?

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• Run shell script on a command

  - by LinuxPenseur

  Hi, I want to run a shell script when date -s <string> command is used. For example i want to log the command to the file /tmp/user.log by executing the following command in the shell script logger -p user.notice "date -s command executed" -f /tmp/user.log How can run a shell script when date -s <string> is executed on the shell? To make it more general, I want to run my shell script when someone else issues a particular linux command on my system. How to do this?

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• How can I create an external SSL wrapper/tunnel page for an insecure webpage behind a firewall?

  - by Ross Rogers

  I have an security cam with a built-in webpage inside my home network. That camera is using basic HTTP authentication instead of SSL. I want to be able to access the camera's webpage from outside my network, but I don't want to open an unencrypted video stream to the outside world. Right now, I'm doing some cumbersome ssh tunneling where I bounce off an ssh server like: ssh -N -L 9090:CAMERA_IP:80 [email protected] and then I connect to my web page like: http://localhost:9090 But this is a pain. Now, gentle reader, I beseech you to tell me how I can use linux (Ubuntu) to get a fully encrypted SSL connection to my internal web page without the hassle of creating an ssh tunnel each time. I believe I can use stunnel, but I'm not sure of the command.

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• How to recover a server from a tar file

  - by Mitch

  In moodle the LMS you can export courses, as a tar.gz, some one said they were going to give me such a thing. I was suprised by the 6 gb size. I was even more suprised when I extracted it, and found the root directory to be the root of the server. The person giving me the course instead of exporting must have just tarred the entire server!! How should I go about recovering this? Is there anyway to start this up in a virtual machine? I have a whole linux server, what to do? I could probably just hand pick the data files I need, but how to access a mysql database with out running mysql? I am so stumped!

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• Latency in TCP/IP-over-Ethernet networks

  - by aix

  What resources (books, Web pages etc) would you recommend that: explain the causes of latency in TCP/IP-over-Ethernet networks; mention tools for looking out for things that cause latency (e.g. certain entries in netstat -s); suggest ways to tweak the Linux TCP stack to reduce TCP latency (Nagle, socket buffers etc). The closest I am aware of is this document, but it's rather brief. Alternatively, you're welcome to answer the above questions directly. edit To be clear, the question isn't just about "abnormal" latency, but about latency in general. Additionally, it is specifically about TCP/IP-over-Ethernet and not about other protocols (even if they have better latency characteristics.)

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• Smarter Ways to Unlock Your Unused Contingency Budgets

  - by Melissa Centurio Lopes

  Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0in; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} Cash flow is becoming increasingly important in the current economy; senior executives are looking for smarter ways of unlocking unused funds for new or ongoing capital expenditure projects. With project contingency budgets on average equaling 10 percent of overall costs, are you confident that you can release this cash without risking existing investments or the health of your overall project portfolio? This is the central question posed in a new report from the EPPM board, Hedging Your Bets? Optimizing Investment Opportunities for Great Cash Flow. The board is Oracle’s international steering committee, which brings together senior figures from leading organizations to discuss the critical role of enterprise project portfolio management (EPPM). C-Level Visibility Will Unlock Funds In addition to exploring how unlocking your contingency funds enables you to augment your cash flow (without resorting to expensive borrowing), the report offers a number of suggestions on how this can be done in a risk-free way, including Building an effective governance framework that shows the demonstrable value of every project within the portfolio Undertaking contingency planning risk assessments that give you complete portfolio wide visibility into all risk factors Establishing executive ownership of the portfolio to promote a more realistic appreciation of the risk levels inherent in the portfolio Creating a chief risk officer role that can review consolidated contingencies and risks so they are not considered in isolation The overriding message behind the report—and the work carried out by the EPPM board—is the need for increased C-level visibility across the entire enterprise project portfolio to enable better business decisions. Read the complete report in English, Chinese, German, or French. Read more in the October Edition of the quarterly Information InDepth EPPM Newsletter

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• write-through RAM disk, or massive caching of file system?

  - by Will

  I have a program that is very heavily hitting the file system, reading and writing randomly to a set of working files. The files total several gigabytes in size, but I can spare the RAM to keep them all mostly in memory. The machines this program runs on are typically Ubuntu Linux boxes. Is there a way to configure the file system to have a very very large cache, and even to cache writes so they hit the disk later? I understand the issues with power loss or such, and am prepared to accept that. Crashing aside, in normal operation the writes should eventually reach the disk! Or is there a way to create a RAM disk that writes-through to real disk?

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• Tor Browser: how do I restart just the browser?

  - by GDR

  I'm using Tor Browser on Linux from time to time, but I close the browser because it has high memory usage, and leave Vidala running in background to help the network and relay traffic. The problem is, when I want to use Tor Browser again, I have to shut down Vidala and start it again. This takes time and has negative effect on the network. When I execute ./App/Firefox/firefox-bin, the browser starts but says it's not connected via Tor network. Any ideas how to start tor browser and make it connect to existing Vidala instance?

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• network configuration busted good

  - by jldupont

  On my Linux Ubuntu Karmic machine, when I try to net conf list I get: [2010/03/14 21:25:18, 0] registry/reg_init_basic.c:32(registry_init_common) Failed to initialize the registry: WERR_ACCESS_DENIED I think I may have busted my networking configuration good this time... I can't get Nautilus "networking" functions to work i.e. the "Places - Network" won't show my Windows workgroup anymore... Please help! note1: I have verified my SAMBA configuration and it isn't the problem. note2: I have uninstalled Winbind, Dnsmasq and Squid to get my configuration as simple as possible to debug.

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• Application base [my path to install here] for host [hostnamehere] does not exist or is not a directory

  - by Hyposaurus

  I am trying to start a new installation of tomcat7 (on arch Linux). I have everything configured how I normally would but I am running into the problem described in the title. This means that tomcat starts but nothing in that host gets deployed. My server and host file: <Host name="localcity" appBase="/home/gary/Sites/localcity/" autoDeploy="true" unpackWARs="false"> </Host> And the directory it is in drwxrwxr-x 4 doug tomcat 4096 Apr 15 11:52 . drwx------ 33 gary users 4096 Apr 15 20:40 .. drwxrwxr-x 2 tomcat tomcat 4096 Apr 15 20:40 localcity drwx------ 2 gary users 4096 Mar 31 10:10 lod It looks like other installations I have, but I am not sure what the problem is.

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• How to switch users without entering password

  - by torbengb

  I'm a newbie running Ubuntu 9.10. I have two users (wife and me), and each user's screensaver is set to lock so that on wakeup, we get to choose which user's desktop to go to. However, Ubuntu requires a password, so this is pretty tedious. I'd like to switch users without entering any password. I know about this trick that works for the boot login, but it doesn't deal with multiple users. Is it possible to set empty passwords for users in Ubuntu, or skip the password in other ways? (I'm expecting real Linux users to suggest that passwordless users must not get any rights and there be an admin user with a strong password. Yes, you're right. But that's not what this question is about. Thanks.)

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• Apache Error Log - "Web Path" instead of Filesystem Path

  - by Craconia

  Hello everyone, I'm running Apache on Linux and I'm using OpenSSH to provide SFTP access to some customers so they can upload their pages and also look at their respective site logs (access & error). I'm using the new feature in OpenSSH to chroot their SFTP access and so far so good. My problem is that on the error_log, every reference for "File not found..." is given using the OS filesystem path as opposed to the "Web" path. I'd rather have the web path on the error log in order not to reveal the OS path. Since I'm already chrooting the users, I don't want to reveal WHERE on the OS their files are actually located... Is it possible to change this behaviour via any directive? I tried looking for it but couldn't find anything :( Thanks, Craconia

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• Samba4 advice for production use

  - by pgb

  I have an old Samba 3 + LDAP server installed that needs to be rebuilt. I'm weighting my options, and Windows Server seems too expensive at the moment, and Samba 4 appeared to be a nice option, coupled with the last Bind 9 that can dynamically add the computers to the DNS. I have about 30 workstations, so I still consider it a small network. My questions are: Is Samba 4 stable enough for production? It seems as if the Samba team is too cautious on when to call their version final, or even beta, as compared with other open source projects. What Linux distribution would you recommend to set it up? I usually use Ubuntu Server, but may use another one if installing / maintaining Samba 4 is better on that one.

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• Erase all traces of Windows 8

  - by user1032531

  Just bought a new HP pavilion desktop with Windows 8. I wish to totally remove Windows 8 and all data on the hard drive, remove any windows partitions, delete all data, and then install a fresh Linux. Problem is I can seem to get to boot from USB or boot from CD. It appears that Windows 8 added the following two "features": UEFI which substitutes what we have known as the BIOS Secure Boot which prevents anything but the installed operating system How do I completely and totally erase all traces of Windows 8? Is it still possible to reformat the hard drive? I don't want a duel boot, I don't want to go back to Windows 7, I just want anything Windows gone.

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• NAS disk - problem with accessing SAMBA

  - by dominolog

  Hello I have a NAS disk running on some version of Linux. The disk is located in local network (5 PC running XP or Vista, all connected to Linksys Router). I have problems accessing NAS resources through SAMBA. The 1st issue is that the NAS is not accessible through hostname (even if it is configured), 2nd point is that it is mostly not accessible through IP manner (\IP_OF_NAS). Rest of services (FTP, HTTP access) works flawlessly. I connected the NAS to my home network (only 1 WinXP and Linsys router) and the NAS is working fine - SAMBA access together with hostname recognition works perfectly. I wonder this is an issue with WINS? Could anybody help? Regards

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• How to config mysql-server for heavy load

  - by Rasmus

  Im in the process of setting up a new database server. I have been running a few mysql database servers before and it has been working okay. But i would like to hear the recommended setup for my server. For example, what should i set the max connection, query_cache_size, table_cache and so on. I have arround 4-600 per second: Open tables: 112 Queries per second avg: 430.386. The server i am setting it up on have the following configuration: Linux version 2.6.32-5-amd64 (Debian 2.6.32-41squeeze2) 2x Intel Xeon X3440 @ 2.53GHz 4GB Ram /, /boot, /tmp etc on Software RAID1, 2x 7200RPM SATA Data location on Software RAID0, 2x7200RPM SATA Im am going to place the mysql databases on the RAID0. Am im missing anything? Let me know! Thanks in advance, im looking forward to hearing from you :-) /Rasmus

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• How to make PuTTY X11 forwarding work in a screen session?

  - by Alex Howell

  I'm using PuTTY with X11 forwarding enabled, using Xming as my X server on Windows 7. When I SSH to a Linux host, X11 forwarding works fine. If I start a "screen" screen manager session, it still works fine. If I disconnect from the screen session, then later resume in a different PuTTY window using "screen -rd", X11 forwarding doesn't work any more - I get an error: xterm X connection to localhost:11.0 broken (explicit kill or server shutdown). This seems to be because $DISPLAY is different in each PuTTY SSH session (localhost:11.0 in the first session, then localhost:12.0 in the next, and so on). If I manually set $DISPLAY to localhost:12.0 in the screen session, X11 forwarding works again. Is there a way to automatically set $DISPLAY in the screen session, each time it's resumed, so that it always matches the parent PuTTY session's?

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• Building a new cluster for mathematical calculations (Win/Lin)

  - by Muhammad Farhan

  I would like to build a new cluster to perform heavy mathematical calculations in Matlab and Abaqus. One of my friend told me that distributed computing is way faster than parallel computing, which is very true after reading a bit on the internet. However, I have never clustered before. Current workstation I own: Dell Precision T5400 2 x Intel Xeon 2.5 GHz 16 GB RAM (2GB x 8) 1 x Western Digital 1TB HDD 7200 rpm 1 x nVidia Quadro FX4600 768MB GPU 1 x 870W PSU OS: Windows 7 Ultimate 64-bit 2nd WS: I can buy another WS similar configuration to the one I own I am not bothered about OS, I am willing to cluster with either Windows or Linux. However, my software are compatible with windows 64-bit only. Please help me setup a cluster. Thank you.

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