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  • What can impact the throughput rate at tcp or Os level?

    - by Jimm
    I am facing a problem, where running the same application on different servers, yields unexpected performance results. For example, running the application on a particular faster server (faster cpu, more memory), with no load, yields slower performance than running on a less powerful server on the same network. I am suspecting that either OS or TCP is causing the slowness on the faster server. I cannot use IPerf , unless i modify it, because the "performance" in my application is defined as Component A sends a message to Component B. Component B sends an ACK to component A and ONLY then Component A would send the next message. So it is different from what IPerf does, which to my knowledge, simply tries to push as many messages as possible. Is there a tool that can look at OS and TCP configuration and suggest the cause of slowness?

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  • How to diagnose RAM?

    - by x-man
    I have a java process that is aborted after a while with SIGSEGV. It started to happen after I upgraded the server with more RAM. Having tested on different JVMs I suspect it might be a hardware problem. But no problem was detected by memtest86. So, what else can I do to detect the source of the problem is? Should I take the RAM modules one by one to detect the faulty module? The server is running on 64bit OpenSuse11.3. The memory is not an ECC one it seems. I have a kit of this (3*4GB * 2 = 24GB): http://www.kingston.com/datasheets/KHX1600C9S3K2_8GX.pdf

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  • Multiheaded X.org with a single workspace-pool

    - by blauwblaatje
    I've got an idea for x.org/$randomwindowmanager in combination with a multiheaded setup, but I haven't figured out how it should work. Also I don't really know where to place the feature request. Now for the idea. I've been working with screen (wikipedia:GNU_Screen) for some years now. One thing I like about it, is the fact that I can get a multi-display mode (screen -x), so you can have multiple terminals all connected to the same screen. The fun thing about it, is that you can get 2 terminals with the same content and switch my onscreen layout, without moving the terminals. I admit, in screen it's not extremely useful, but I think for a wm it can be. Imagine this. You've got two monitors and 4 workdesks. On one workdesk I've got my IDE with code, on the second one I've got the output, on the third one I've got the documentation and on the forth one I've got my e-mail and IM clients. At one moment, I want my IDE and output on my monitors, another moment my code and documentation and Yet another moment my IM to consult a colleague and documentation or code. Finally my colleague comes to help me at my desk. I'd like it if we could both watch the same workdesk without him sitting on my lap, so I turn one monitor so he can see it better. It would be great if we could see the same thing that's on my monitor (exclude mousepointer). The thing with most WMs is that your workspaces on the two monitors are either separated or glued together. If they're separated, you can change workspaces on each monitor autonomous, but you can't exchange applications between monitors because they're different x-clients (iirc). If they're glued together (xinerama), you can exchange the applications, but when changing your workspace, the other monitors change too. So, what I'd like to know is this. Is this already possible or should I submit a feature request somewhere (and if so, where?)

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  • Using more recent kernel for Xen Dom0 in production.

    - by thelsdj
    Does anyone have experience running Xen dom0 on a more recent kernel than the stock 2.6.18? What host distro are you running? What release of Xen (or hg/git changeset)? What set of patches are you using on kernel source? (Has anyone got the pvops dom0 stuff working in production or is it better to stick with something like the SUSE patches? Any other tips and tricks to running a more recent kernel version as dom0 would be helpful.

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  • Converting an ancient RH8 system to VMware ESXi

    - by donatello
    I am curious to know what options I have to convert a very old RedHat8 machine to a virtual one on ESXi. Looking at VMware Converter it seems there's an option to login to the RH8 using SSH, and from there it will convert to the ESXi-server. That makes me a bit nervous though, exactly what is happening there? The RH8 machine is slightly critical, and if anything messes up it'll likely result in many hours extra work. :( Another option I thought of was to boot a LiveCD on RH8-system and create a raw "dd dump" of the disk. The similar method is used to restore the image, I boot a LiveCD on the VM in ESXi and use "dd" to write it to disk. Is there any other option I could use? I'm using the cheap version of ESXi, hence I have no access to the Converter BootCD so these rather cumbersome methods is the only I can think of. :)

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  • Dual-head monitor system Kubuntu 10.04

    - by andrii
    I have a notebook Asus V6X00V with 1400*1050 monitor(name: LVDS) and Dell Monitor 1920*1080 (VGA-0). I want to have a dual monitor system. At MS Windows everything is working fine. During the Kubuntu installation the Dell and the main notebook monitors have a right resolutions(1920*1080 & 1400*1050). But after some stage it have been changed to the 1152*864 for both. Now the right resolution is only during turning off process and when I am using the console. So it shows that system can use this resolutions. The problem is just in a settings. I am using Size & Orientation - System Settings for setting adjustment. Any option that changes resolution for any monitor or changing position(Absolute, Left Of, Right of and so on) cause the color line noise on the screens. I have tried xrandr: xrandr --output LVDS --mode 1400x1050 --pos 0x0 --output VGA-0 --mode 1920x1080 --right-of LVDS --pos 1400x0 but have received the same result. I have find out that for example the previous version of Randr(1.2, now I have xrandr 1.3) need a xorg.conf file modification to create a big virtual screen, but kubuntu 10.4 don't have xorg.conf and I don't know should I modify xorg for 1.3 version of xrandr or not. Please help me to solve this problem

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  • xinet vs iptables for port forwarding performance

    - by jamie.mccrindle
    I have a requirement to run a Java based web server on port 80. The options are: Web proxy (apache, nginx etc.) xinet iptables setuid The baseline would be running the app using setuid but I'd prefer not to for security reasons. Apache is too slow and nginx doesn't support keep-alives so new connections are made for every proxied request. xinet is easy to set up but creates a new process for every request which I've seen cause problems in a high performance environment. The last option is port forwarding with iptables but I have no experience of how fast it is. Of course, the ideal solution would be to do this on a dedicated hardware firewall / load balancer but that's not an option at present.

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  • "What happens?" server performance monitor

    - by AlexAtNet
    Hello! After reviewing some thread about server monitoring software I end up with a simple question: Which of the server monitoring tools should I use for automatic detection of "abnormal" situations with recommendations on how to fix them? I look for software that checks the system performance after installation and calculate some average load values (memory, CPU, etc). And when something happens (CPU load is increased to 20%) then it tries to detect a reason for this. If it is apache, it should check for access logs. If mysql, it should check mysql logs and tell me what happens. It this is because some user decodes a lot of images, I'd like to know which command is executed, when and user name. The same for disk usage, memory, number of processes, threads and so on. Ideally, this software should periodically checks the system and report problems: errors in PHP error log, outdated packages, security vulnerabilities. In other word I'm looking a software that will keep my simple Debian/Apache/PHP/MySQL server without forcing me to monitor the charts every day. I hope that such program exists. Thanks, Alex

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  • Iptables ignoring a rule in the config file

    - by Overdeath
    I see lot of established connections to my apache server from the ip 188.241.114.22 which eventually causes apache to hang . After I restart the service everything works fine. I tried adding a rule in iptables -A INPUT -s 188.241.114.22 -j DROP but despite that I keep seeing connections from that IP. I'm using centOS and i'm adding the rule like thie: iptables -A INPUT -s 188.241.114.22 -j DROP Right afther that I save it using: service iptables save Here is the output of iptables -L -v ` Chain INPUT (policy ACCEPT 120K packets, 16M bytes) pkts bytes target prot opt in out source destination 0 0 DROP all -- any any lg01.mia02.pccwbtn.net anywhere 0 0 DROP all -- any any c-98-210-5-174.hsd1.ca.comcast.net anywhere 0 0 DROP all -- any any c-98-201-5-174.hsd1.tx.comcast.net anywhere 0 0 DROP all -- any any lg01.mia02.pccwbtn.net anywhere 0 0 DROP all -- any any www.dabacus2.com anywhere 0 0 DROP all -- any any 116.255.163.100 anywhere 0 0 DROP all -- any any 94.23.119.11 anywhere 0 0 DROP all -- any any 164.bajanet.mx anywhere 0 0 DROP all -- any any 173-203-71-136.static.cloud-ips.com anywhere 0 0 DROP all -- any any v1.oxygen.ro anywhere 0 0 DROP all -- any any 74.122.177.12 anywhere 0 0 DROP all -- any any 58.83.227.150 anywhere 0 0 DROP all -- any any v1.oxygen.ro anywhere 0 0 DROP all -- any any v1.oxygen.ro anywhere Chain FORWARD (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy ACCEPT 186K packets, 224M bytes) pkts bytes target prot opt in out source destination `

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  • Messy Filesytem : Duplicate File Removal from the command line

    - by jrause
    In debian/ubuntu I want to a) create a list of all the files in one directory tree b) do the same for a second directory tree c) compare the two lists such that, only the file NAMES are compared (i.e. just comparing the "file.txt" part so that "/home/folder/file.txt" == "/home/secondfolder/folder/file.txt) d) output a list of all the duplicates can anyone please explain how to do this using scripting languages or regex or something?

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  • what to do when ctrl-c can't kill a process?

    - by Dustin Boswell
    Ctrl-c doesn't always work to kill the current process (for instance, if that process is busy in certain network operations). In that case, you just see "^C" by your cursor, and can't do much else. What's the easiest way to force that process to die now without losing my terminal? Summary of answers below: Usually, you can Ctrl-z to put the process to sleep, and then do "kill -9 process-pid", where you find the process's pid with 'ps' and other tools. On Bash (and possibly other shells) you can do "kill -9 %1" (or '%N' in general) which is easier. If Ctrl-z doesn't work, you'll have to open another terminal and kill from there.

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  • Minimize VirtualBox Hard Drive disk

    - by Aviv
    I have Ubuntu Server 10.04 TLS installed on a Virtual Machine in a VirtualBox. The size of the Hard Drive is dynamic growing hard drive and the maximum is 32GB. At the beginning i had 4GB on the Hard Drive and the size of the .vdi was 4GB. Lately the size of data on the disk is 15GB but the size of the .vdi is almost 32GB. Why is that? How can i pack / optimize / defrag the HD so it will be the same size of the data on the disk? Thanks.

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  • Subversion error: Repository moved permanently to please relocate

    - by Bart S.
    I've set up subversion and apache on my server. If I browse to it through my webbrowser it works fine (http://svn.host.com/reposname). However, if I do a checkout on my machine I get the following error: Command: Checkout from http://svn.host.com/reposname, revision HEAD, Fully recursive, Externals included Error: Repository moved permanently to 'http://svn.host.com/reposname/'; please relocate I checked apache's error log, but it doesn't say anything. (it does now - see edit) My repositories are stored under: /var/www/svn/repos/ My website is stored under: /var/www/vhosts/x/... Here's the conf file for the subdomain: <Location /> DAV svn SVNParentPath /var/www/svn/repos/ AuthType Basic AuthName "Authorization Realm" AuthUserFile /var/www/svn/auth/svn.htpasswd Require valid-user </Location> Authentication works fine. Does anyone know what might be causing this? -- Edit So I restarted apache (again) and tried it again and now it give me an error message, but it doesn't really help. Anyone have an idea what it means? [Wed Mar 31 23:41:55 2010] [error] [client my.ip.he.re] Could not fetch resource information. [403, #0] [Wed Mar 31 23:41:55 2010] [error] [client my.ip.he.re] (2)No such file or directory: The URI does not contain the name of a repository. [403, #190001] -- Edit 2 If I do svn info it doesn't give anything usefull: [root@eduro eduro.nl]# svn info http://svn.domain.com/repos/ Username: username Password for 'username': svn: Repository moved permanently to 'http://svn.domain.com/repos/'; please relocate I also tried doing a local checkout (svn checkout file:///var/www/svn/repos/reposname) and that works fine (also adding / commiting works fine). So it seems is has something to do with apache. Some other information: I'm running CentOs 5.3 Plesk 9.3 Subversion, version 1.6.9 (r901367) -- Edit 3 I tried moving the repositories, but it didn't make any difference. selinux is disabled so that isn't it either. -- Edit 4 Really? Nobody :(?

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  • Application windows have colossal fonts in Enlightenment 17, while system windows are untouched

    - by Matt
    I'm trying to get used to using Enlightenment instead of KDE on my Slackware64 multilib computer, but I'm having a terrible time getting one problem fixed. My fonts are HUGE on application windows - from Firefox to Gimp to Xchat to anything else, all the fonts are 3x the size they should be. But at the same time, the system menu is the correct size. I'm at a loss - I want the applications to have the same DPI as the system menu. When I'm in KDE, they all look normal. I've included a screenshot to show what I'm talking about.

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  • amplified reflected attack on dns

    - by Mike Janson
    The term is new to me. So I have a few questions about it. I've heard it mostly happens with DNS servers? How do you protect against it? How do you know if your servers can be used as a victim? This is a configuration issue right? my named conf file include "/etc/rndc.key"; controls { inet 127.0.0.1 allow { localhost; } keys { "rndc-key"; }; }; options { /* make named use port 53 for the source of all queries, to allow * firewalls to block all ports except 53: */ // query-source port 53; /* We no longer enable this by default as the dns posion exploit has forced many providers to open up their firewalls a bit */ // Put files that named is allowed to write in the data/ directory: directory "/var/named"; // the default pid-file "/var/run/named/named.pid"; dump-file "data/cache_dump.db"; statistics-file "data/named_stats.txt"; /* memstatistics-file "data/named_mem_stats.txt"; */ allow-transfer {"none";}; }; logging { /* If you want to enable debugging, eg. using the 'rndc trace' command, * named will try to write the 'named.run' file in the $directory (/var/named"). * By default, SELinux policy does not allow named to modify the /var/named" directory, * so put the default debug log file in data/ : */ channel default_debug { file "data/named.run"; severity dynamic; }; }; view "localhost_resolver" { /* This view sets up named to be a localhost resolver ( caching only nameserver ). * If all you want is a caching-only nameserver, then you need only define this view: */ match-clients { 127.0.0.0/24; }; match-destinations { localhost; }; recursion yes; zone "." IN { type hint; file "/var/named/named.ca"; }; /* these are zones that contain definitions for all the localhost * names and addresses, as recommended in RFC1912 - these names should * ONLY be served to localhost clients: */ include "/var/named/named.rfc1912.zones"; }; view "internal" { /* This view will contain zones you want to serve only to "internal" clients that connect via your directly attached LAN interfaces - "localnets" . */ match-clients { localnets; }; match-destinations { localnets; }; recursion yes; zone "." IN { type hint; file "/var/named/named.ca"; }; // include "/var/named/named.rfc1912.zones"; // you should not serve your rfc1912 names to non-localhost clients. // These are your "authoritative" internal zones, and would probably // also be included in the "localhost_resolver" view above :

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  • SSH agent forwarding on debian squeeze

    - by nfvindaloo
    Im trying to set up SSH forwarding like this osx debianA debianB I can connect to debianA fine, using ssh -A and it has the following env vars when i do: SSH_AGENT_PID=1543 SSH_AUTH_SOCK=/tmp/ssh-giwdYY1542/agent.1542 SSH_CLIENT='92.233.199.x 38954 22' SSH_CONNECTION='92.233.199.x 38954 108.171.179.x 22' SSH_TTY=/dev/pts/0 When i try to connect to debianB, the agent is not used! ssh -v output ends with: debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey,password debug1: Next authentication method: publickey debug1: Trying private key: /home/nic/.ssh/id_rsa debug1: Trying private key: /home/nic/.ssh/id_dsa debug1: Next authentication method: password Then im asked for a password. I have not set any ForwardAgent no directives in ssh_config and dont have a .ssh/config at all. sshd_config has not got AllowAgentForwarding in it. I have tried all of these directives as yes also. debianA and debianB both have identical ssh_config and sshd_config (verified with diff) so the really weird thing is connecting OSX debianB debianA works fine!! Im totally out of ideas! Has anyone come across this before? Cheers! NFV

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  • Is there DBus command to set position of KDE panel?

    - by Liss
    I have single vertical KDE panel. When I switch from single monitor X screen back to triple monitor X screen (with xrandr) my KDE panel ends up on the right edge of middle monitor, instead of right edge of right monitor. Also, many windows are in wrong place after the switch, but I have a script which restores geometry of all windows (as is used to be in triple monitor state before I switched to single monitor mode), so this is not a problem. Unfortunately, it does not work for KDE panel - it stays in the wrong place. I guess I need to use DBus to restore KDE panel position (programmatically move it to right edge of right screen), I tried googling, but it seems it is not very well documented. Is there DBus command to set position of KDE panel?

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  • default virtual network interface

    - by Zulakis
    I got a single ethernet connection to a network but need multiple ips. Because of this, I am using virtual network interfaces like this: auto intern iface intern inet static address ... netmask ... gateway ...U auto intern:1 iface intern:1 inet static address ... netmask ... gateway ... I need to specify which IP should be used by default for outgoing traffic. How can I do that?

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  • understanding my site's DNS records

    - by DaveM
    firstly apologies for using the word 'pointage' this is the word my french domain registrar uses so I may have used to wrong term. OK I would like to better understand what is going on on my 'pointage' record on my domain registrars site. for my (currently empty) web site it reports the following details... Type : Host : Destination A : www.mydomain.org : 62.210.176.146 A : mail.mydomain.org : 84.246.225.176 Mx : .mydomain.org : mail.mydomain.org I think I understand the MX record, that simply relays anything onto the mail.mydomain.org location. However why are the destination for the www and mail domains different. Even more confusing (for me) is the fact that if I ping either of www.mydomain.org or mail.mydomain.org the ping returns a different IP address. This IP address is consistent with that of my server (ie 92.39.247.92). So what exactly is going on ? I'm sure I could find the information on the web,I've read a few thing on the debianhelp site regarding DNS records, and it seems to suggest that the record should be a reverse lookup, but certains isn't the reverse of my servers IP ? but I don't what I should be looking for, so links to docs and search terms for google will be happily accepteed (even though they go against the grain of SO answers to question). thanks in advance. David. ps. I should add that everything seems to work just fine, and I've just descovered this part of the management page of my registrar. Edit: Addition of DNS records and ping results. The DNS record for the site. From what I've read there should only realy be a single 'A' record, so has something gone wrong ? should I change it (remove the extras and then just point www.facilitee.org - .facilitee.org and mail.facilitee.org - .facilitee.org here is the DNS record A www.facilitee.org ? 92.39.247.92 A .facilitee.org ? 92.39.247.92 A mail.facilitee.org ? 92.39.247.92 A webmail.facilitee.org ? 92.39.247.92 MX .facilitee.org ? mail.facilitee.org ping results... ~$ ping www.facilitee.org PING www.facilitee.org (92.39.247.92) 56(84) bytes of data. 64 bytes from vps4576-cloud.dns26.com (92.39.247.92): ~$ ping mail.facilitee.org PING mail.facilitee.org (92.39.247.92) 56(84) bytes of data. 64 bytes from vps4576-cloud.dns26.com (92.39.247.92): So the DNS and the ping correspond, but the 'pointage' doesn't. ~ how can I get a report of the pointage records other than from my registrar ?

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  • Smokeping monitoring IP address and port

    - by bob
    Hi I have successfully install smokeping on my Ubuntu Karmic machine and am monitoring servers. I need to be able to monitor an IP address and a port, can someone tell me how I do that? I looked into Smokeping::probes::TCPPing but I cannot find how to install TCPPing Any help would be much appreciated Thanks

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  • What exactly interpret #!/bin/bash line?

    - by vava
    Many scripts in different languages have a #!/bin/bash header with a path to interpreter, so they can be executed without explicit call to interpreter from command line. But what exactly reads this line and run the interpreter, is it shell or kernel?

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  • How can I upgrade Ubuntu from 9.10 to 10.04 on a netbook with a 4GB root partition?

    - by Blorgbeard
    I have an Asus EeePC 901, running Ubuntu 9.10. I'd like to upgrade it to 10.04. I don't want to reinstall, since I have a bunch of scripts and programs all set up. However, when I attempt to upgrade using sudo apt-get dist-upgrade, I get an error asking me to free up another ~600MB on /. My / is mounted on sda0, which is a 4GB SSD. I do not have 600MB worth of deletable stuff on /. I've emptied my trash, and done apt-get autoremove and apt-get clean. I do have plenty of space in /home, mounted on sda1 (a 16GB SSD). Is there some way I can tell apt-get to use a different download/temp directory?

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