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• Windows7 NFS with linux server

  - by Vitaly

  Hi. I have an Ubuntu server and want to access its web folder (/var/www). What I done: installed nfs-kernel-server, nfs-common and portmap (as in faq) Setted up /etc/exports: /var/www 192.168.1.0/255.255.255.0(rw,no_roow_squash,async,subtree_check) Then: sudo exportfs -ra Then: sudo /etc/init.d/nfs-kernle-server restart I checked, if all works on same machine: sudo 192.168.1.101:/var/www /mnt/test Then accessed /mnt/test and seen that all data present and all ok. Next, I tried to connect this folder to windows7 using NFS client: First, I checked, that linux exported path successfully: showmount -e 192.168.1.101 /var/www 192.168.1.0/255.255.255.0 All ok, go to mount: mount -o anon 192.168.1.101:/var/www z: Console said, that all success.. but. I cant access drive Z (drive exists in the system and point to right folder). When I try to access drive Z my Explorer just going to sleep and then say that timeout expired. Help me please.

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• When to increase AWS RDS MySQL Server instance to larger CPU/RAM?

  - by rksprst

  I'm wondering at what stage do I need to increase the image for the RDS MySQL server to a larger CPU/RAM instance. The CPU utilization graph is near 0. The Avg Free Memory is around 150MB. The Avg Swap Usage is 420MB. Read Latency is 0-20ms/op it spikes up randomly. Avg write latency is on average 5ms/op but spikes up to 10-20ms/op. Are there some common rules here that I should follow? Thanks!

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• How to prevent any files from being copied onto the Desktop?

  - by Kaushik Gopal

  Gentlepeeps, Is there any solution to prevent copying of files onto the desktop? My folks and i currently have one super-common-comp in our place. And when all of the laptops are busy, we tend to do some quick surfing on this comp. I prefer to keep things freakishly organized in this comp and one thing i hate is having those off-shoot irritating forwarded downloads on my desktop. Is there some way to restrict files from being copied onto the desktop? I tried making the administrator user's desktop folder as read-only :P . That doesn't solve the problem. Any other ideas/software/solutions? cheers.

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• What software can I use to read png metadata?

  - by Johan

  I know that I can create a simple little Qt based application that adds and read png metadata, using the QImage.setText(...) and QImage.text(...). That metadata can then be read with a linux command called pngmeta. But what other image software can I use to read out the png metadata? Please note that I'm seeking image programs for the common platforms, so please specify if your application is for Windows or Linux. To make the question clearer I attached a img with some test metadata attached to it. Thanks Johan Links: http://en.wikipedia.org/wiki/Portable_Network_Graphics - png http://en.wikipedia.org/wiki/Extensible_Metadata_Platform - xmp metadata

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• Detecting man-in-the-middle attacks?

  - by Ilari Kajaste

  There seem to be many possible ways to create man-in-the-middle attacks on public access points, by stealing the access point's local IP address with ARP spoofing. The possible attacks range from forging password request fields, to changing HTTPS connections to HTTP, and even the recently discovered possibilit of injecting malicious headers in the beginning of secure TLS connections. However, it seems to be claimed that these attacks are not very common. It would be interesting to see for myself. What ways are there to detect if such an attack is being attempted by someone on the network? I guess getting served a plain HTTP login page would be an obvious clue, and of course you could run Wireshark and keep reading all the interesting ARP traffic... But an automated solution would be a tiny bit more handy. Something that analyzes stuff on the background and alerts if an attack is detected on the network. It would be interesting to see for myself if these attack are actually going on somewhere.

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• Shell Script Launching Child Processes

  - by Matt James

  Disclaimer: I'm totally new to shell scripting, but have quite a bit of experience in other languages like PHP and Obj-C. I'm writing my first daemon script. Here are the goals: I want it to run in the background I want it to be triggered by an init.d script that includes start/stop/restart commands I want each process in a loop to trigger its own subprocess. When the parent process kicked off by the init.d script is killed, I want the subprocesses to die as well. Essentially, I'm looking for the same kind of behavior that appears to be very common among software like apache, spamd, dovecot, etc. But, based on my research, I haven't found a single, simple answer as to how this kind of thing is achieved. Any help is greatly appreciated.

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• For kvm host images. GFS2 or OCFS2 with drbd8?

  - by yvess

  I want a shared filesystem on top of drbd8 on two nodes. The servers run ubuntu 9.10. I googled a lot, but couldn't find an clear trend what the web community prefers. It's seems that OCFS2 is more used at the moment. Which filesystem is more reliable, faster? GFS2 or OCFS2? Is the linux community going more towards GFS2 or OCFS2? Which of this two is better supported by ubuntu 9.10? Are there better (or more common) alternatives?

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• Adding lines to /etc/profile with puppet?

  - by miku

  I use puppet to install a current JDK and tomcat. package { [ "openjdk-6-jdk", "openjdk-6-doc", "openjdk-6-jre", "tomcat6", "tomcat6-admin", "tomcat6-common", "tomcat6-docs", "tomcat6-user" ]: ensure => present, } Now I'd like to add JAVA_HOME="/usr/lib/java" export JAVA_HOME to /etc/profile, just to get this out of the way. I haven't found a straightforward answer in the docs, yet. Is there a recommended way to do this? In general, how do I tell puppet to place this file there or modify that file? I'm using puppet for a single node (in standalone mode) just to try it out and to keep a log of the server setup.

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• Are SANs unreliable?

  - by chaos

  So at the place where I wear one of my various hats, this one representing a development rather than admin role, there's been an initiative to move to SANs. So far, I have been spectacularly unimpressed. First it was this behavior where, when MySQL databases are on the SAN, the first few tables that anything tries to hit after the system boots come up as nonexistent and MySQL has to be restarted before it realizes they're actually there. Then today, on multiple systems (including the primary SVN repository, ever-so-wonderfully) we get SAN mounts spewing IO errors and the filesystems going into read-only, which is the kind of behavior I expect from directly mounted naked disks, not fault-tolerant managed storage. Right now, I'm at the point where if I were putting together a project and somebody said "hey we should use SANs", my response would be "GTFO". So basically I want to know whether my experience is typical or even common, or whether I'm having some kind of freakishly bad luck with SANs. The systems these SANs are attached to are all CentOS machines, if that's relevant.

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• What is the purpose of a boot priority sequence or order in BIOS

  - by rbeede

  A BIOS provides multiple options for specifying an order/priority to search for boot devices. Is there really much of a purpose now to have to specify more than one possible boot device? It would seem to me it is only useful when popping in an CD/DVD to install an OS after which the common scenario is to always boot from the hard drive unless something is broken. I'm curious as to why not simply have 1 option/device to set in the BIOS and expect the user to press a key to do alternate boot instead? Is there still a scenario for having the BIOS try multiple devices in a configured order?

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• XFS and loss of data when power goes down

  - by culebrón

  Each time electricity goes down, my desktop (without UPS) loses some temporary information. Opera can lose settings, history, cache, or mail accounts (Thanks heavens I was wise to use IMAP). Partially or all together. a whole file (complete and save) in Geany appeared empty (and I didn't commit it to Git) rhythmbox lost all podcasts subscription data I'm afraid there are other losses I just didn't see. What's the reason? A memory files cache, a mem-disk? Or non-atomic file writes in xfs? I have Ubuntu 9.10 and XFS on both / and /home partitions. Is ext4 safer in such circumstances? I've seen ext3 is faster. Is it as safe as *4? Given that the apartment I rent is connected to a common bus and 1 safety switch for several apartments, and the neighbors - alone or together - overload it at least once every week, the lights go down often enough for this to be an issue.

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• iWork '09 Keynote: is there is straightforward way to 'dim' and 'highlight' each item in a bullet li

  - by doug

  I have a bullet list on a slide: first item second item third item What I want to do is show those three bulleted items in a sequence like this: first bullet appears first bullet dims second bullet appears second bullet dims third bullet appears third bullet dims In other words, only one bullet is shown at a time (the one i am current discussing) to reduce audience distraction by what comes next or what i just finished discussing (the prior bullet). This is such a common thing to do, there's got to be a simple, reliable way to do it. The only way I know of is to configure the items individually (using "Build In" and "Action" on each bullet item, which is not only slow but doesn't work well). Another way i've found--which, again is very slow--is to create my bullet list not by selecting a bullet list, but to build the list manually with text boxes (one bullet item per text box) then line them up as a list. This way it's easier to manipulate them independently--again though, takes way too long to do one slide this way.

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• Upgrade PHP to 5.3 in Ubuntu Server 8.04 with Plesk 9.5

  - by alcuadrado

  I have a dedicated server with Ubuntu 8.04, and really need to upgrade php to 5.3 version in order to deploy a new version of the system. This version of php is the default one in ubuntu 10.04, so I considered upgrading the OS, but after trying that, I lost my plesk installation, which annoyed my client. I tried adding the dotdeb.org repositories, but don't know why, after running an apt-get upgrade, I get this error: # apt-get upgrade Reading package lists... Done Building dependency tree Reading state information... Done The following packages have been kept back: libapache2-mod-php5 php5 php5-cgi php5-cli php5-common php5-curl php5-gd php5-imap php5-mysql php5-sqlite php5-xsl 0 upgraded, 0 newly installed, 0 to remove and 11 not upgraded. Any idea why is this happenning? Or do you know any alternative method (except compiling my own binaries) to upgrade php or update ubuntu without loosing plesk? Thanks!

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• MySQL started to consume about 40% of system CPU time and got unresponsive suddenly

  - by Alex

  I use Debian 6.0.3 x86_64 and MySQL 5.5.20-1~dotdeb.0-log from the Dotdeb repository. MySQL process started to consume a lot of "sy" CPU time serveral hours ago according to this graph. I was not able to connect to running mysqld process and had to kill it. I found nothing useful in logs. My setup seems to be quite common (I assume Dotdeb just redistributes stock MySQL versions) and I have never seen anything like this before. What is the possible root cause of this? How can I prevent this situation in the future?

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• How do you use environment variables, such as %CommonProgramFiles%, in the PATH and have them recognized by services.exe?

  - by Brad Knowles

  I'm trying to add C:\Program Files\Common Files\xxx\xxx to the system PATH environment variable by appending %CommonProgramFiles%\xxx\xxx to the existing path. After rebooting, I open a command prompt and check the PATH. It expands correctly. However, when using Process Explorer from Sysinternals to view the Environment variables on services.exe, it shows the unexpanded version. Coincidentally, the paths using %SystemRoot% expand and are recognized just fine. I've tried altering the PATH through the Environment Variables window from System Properties and through direct Registry manipulation, neither seems to work. Is it possible to use other environment variables, besides %SystemRoot% in PATH and have services.exe understand it?

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• How do projects manage chef cookbooks when multiple teams manage multiple sets of cookbooks?

  - by strife25

  I am wondering how projects that have multiple component teams manage their sets of cookbooks? We are trying to figure out how we can have an ops team provide a set of "common component" cookbooks that can be re-used by other teams that will also write their own cookbooks. For example, the ops team should own the Java cookbook, while a component manages their cookbooks written for their component or build engines. From my little experience with chef server, this kind of workflow seems to not be well supported since the server stores and manages all cookbooks - so there is a potential to overwrite a cookbook written by another team. How do other projects deal with this type of problem?

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• Why can't I install apps on Windows 8 using specific dial-up modem connections?

  - by Vincent of Earth

  This problem has persisted since I first tried out Windows 8 Consumer Preview, and also affects Windows 8, Windows 8.1 Preview, and Windows 8.1. Specifically, the problem occurs when I try to install apps from the Windows Store on a Globe Tattoo Broadband or Smart Bro dial-up connection (two common ways of connecting to the internet in the Philippines). I can confirm that this isn't a problem with my copy of Windows or my Microsoft account because I was able to install any app on other connections like public WiFi. This problem has persisted on three different dongles and two different computers. So why can't I install apps on those two specific types of connections?

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• Bridge virtual machines out WLAN interface

  - by Thomas

  It seems that my wlan card (intel 5100 AGN) firmware doesn't allow "spoofing" MAC addresses. This has the side effect of destroying the capability to bridge out my virtual machines on that interface. Apparently this is a common thing on wlan cards. I can see the incoming traffic just fine in my virtual machines, but their DHCP queries don't get bridged out of the WLAN card. It works perfectly well when using the wired ethernet port. Is there a workaround for this? MAC-NAT or something? I don't want to route my virtual machines out to the Internet because I don't want my host OS to even have an IP address. I'm using Linux and KVM for virtualization.

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• How to add nvidia drivers after previous failure with linux mint?

  - by LessThanMe

  Before today, I had perfectly good drivers from nvidia for my linux mint (15) box. I decided to update it because my performance in TF2 is less than stellar, and then things went south. I used synaptic to install nvidia-331 and then rebooted, but when I selected Mint in GRUB I waited...and waited...and waited. Nothing happened, but the display stayed on (a completely black video was being output). So I went into recovery mode from GRUB, went to root access, and apt-get remove --purge nvidia*'d my way out of that mess, and installed nvidia-common. Now my performance in graphic intensive stuff (read: games, blender) sucks, so I've been through the same thing a few times trying to re-install nvidia-current. I just want to get it back how it was. Thanks for any help! Nvidia GTX 560

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• Wiping out user and/or root password in embedded linux

  - by TryTryAgain

  We have a security camera system running an embedded linux. It boots with Lilo as a bootloader and has no tty access once booted. I don't know any username either. SSH/22 is open, but I don't think brute force is an option. I have tried all the common tricks to reset a linux user password (boot from the bootloader in single user mode = doesn't happen, still prompts for user login, boot to a live cd = can't access the file system...it's all loop files and other binary, etc etc), but they are all not possible as it is an embedded linux setup the way it is. Any help/suggestions would be appreciated. Thanks

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• How does ARM Cortex A8 compare with a modern x86 processor

  - by thomasrutter

  I was wondering how does a modern ARM chip based on ARM Cortex A8 compare, in clock-for-clock performance and capability, to a modern x86 chip such as a Core 2 Duo or Core i5? I realise due to the different instruction sets it'll depend heavily on what you're doing. To put it another way, rendering a web page in webkit on a 1GHz ARM Cortex A8 based chip should be about equivalent to doing in on a Core i5 at __ MHz? Update October 2013: Since I asked this question years ago it's become a lot more common, when reading about mobile devices, to see architecture-agnostic benchmarks that you can compare across platforms - for example, in-browser benchmarks like Sunspider in Webkit will run on just about anything and you see these in reviews all the time now. And there's things like Geekbench now.

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• Postgres error messages in Apache error log

  - by Warren Pena

  I'm running Apache 2.2, PHP 5.2, and Postgres 8.2 on Windows, and I'm seeing something funky in Apache's error.log file. Occasionally, I'll see the message "row number -1 is out of range 0..-1" pop up over and over. Unlike all the other lines in that log file, there's no timestamp or log level. Just that exact string. Googling around, it appears that message is, character for character, a common Postgres error message, but is not an Apache error. I've seen it happen multiple times, and on several different servers. I can't seem to reproduce it, though. I've tried throwing all sorts of error ridden database queries and result set inquiries at Postgres via PHP, and none of them seem to trigger that line being written to the log file. Is it possible for Postgres errors to be ending up in my Apache log file, and if so, how? What would trigger an error message like that? Thanks!

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• My site cant be accessed from certain ISPs

  - by Nuker

  I am on a VPS hosted by a company in Europe. I can access my site normally, many other people i know can as well. However in the recent days i have received reports from many other people that say they cant. They get a timed out request error page. The common denominator seems to be they all have the same ISPs. I have had reports from several different countries such as Spain, Peru, Argentine etc. What can be happening?

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• Switch HTTP Virtual Host to HTTPS Virtual Host

  - by Kumar

  We are using apache web server with RHEL 6.4. Currently we configured Name based virtual host on server. Enabled "Namebased Virtualhost *:80" and created /etc/httpd/conf.d/example-com.conf <VirtualHost *:80> ServerAdmin [email protected] DocumentRoot /var/www/vhost/example.com/public_html ServerName www.example.com ServerAlias example.com ErrorLog /var/log/httpd/vhosts/example-com-error_log CustomLog /var/log/httpd/vhosts/example-com-access_log common </VirtualHost> I've located my ssl certificates by /etc/httpd/conf.d/ssl.conf In this case how can I switch 80 site to 433 and also redirect all requests to 80 to 443

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• [Apache] mod_rewrite www.site.com/dir/ --> www.site.com/dir/2009/

  - by Casey

  I'm having trouble with this rewrite. I've never really used mod_rewrite before and don't have much experience with regex. Any help is appreciated! <IfModule mod_rewrite.c> Options +FollowSymLinks RewriteEngine on #prevent nested looping RewriteCond %{ENV:REDIRECT_STATUS} ^$ #re-route incoming requests RewriteRule ^(.*)$ %{REQUEST_URI}2009/$1 [L,NE] </IfModule> This partially works, http://www.site.com/dir/ is routed to http://www.site.com/dir/2009/ but a request like http://www.site.com/dir/css/theme.css fails. I'm hoping to rewrite all requests to the parent directory into the 2009 subdirectory but I keep encountering infinite loops and server errors messages. I haven't found any useful examples out there. I figured this would be a common rewrite... Thanks in advance!

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