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• Is it normal for Java /Tomcat to keep checking for java_pid<nnnn>.hprof?

  - by Chris

  I was monitoring my JVM running Apache Tomcat 6, running on Windows, and I noticed that every 3 seconds or so the JVM process (C:\Tomcat\bin\tomcat6.exe) is polling to see whether or not C:\Tomcatcat\java_pid3748.hprof exists, where 3748 is the Windows process ID. I haven't seen write to the hprof file, just test for existence. (I'm using Sysinternals Process Monitor (procmon.exe) for this monitoring. In procmon the polling shows up as a QueryDirectory operation, which always returns Result "NO SUCH FILE".) Is this normal, or is this a potential red flag? I gather that these hprof files are generated, perhaps among other times, when you enable the -XX:+HeapDumpOnOutOfMemoryError Java flag. I haven't enabled it myself, though I guess it could be enabled somehow in the Tomcat startup scripts.

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• Can I set up a 2nd home wireless router, with router2 connecting to the internet through a desktop which is wirelessly connected to router1?

  - by gil b.

  Hi, I apologize for the crudeness of my MSPaint drawing, but please view my diagram of what I'd like to accomplish: Proposed home network architecture Currently, all devices are connected to 1 wireless router. I would like to make my own subnet, with a box in-between my subnet and the shared wireless router, so that I can learn about IDS, traffic analysis, etc. I was also given a cisco PIX firewall to play around with, and it'd be an added bonus if I could incorporate that into my network. The reason for this proposed architecture is so that I can monitor all MY traffic, without seeing anything going on with my roommates' traffic. my MAIN Question is, is it possible to have my desktop connect to the wireless router with internet via wireless card AND share that connection via the ethernet card, hooked to wireless router 2? cable modem - wireless router - desktop pc connected wirelessly - wireless router 2 getting internet from wired connection to desktop pc - laptops connected wirelessly The PIX can be left out for now, but I'm wondering if it could eventually be incorporated? THANKS!

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• configure Heartbeat on Centos Linux - error message

  - by Elad Dotan

  I installed Heartbeat on my Centos Linux and it seems to partially work..but I'm trying to monitor a service with no success. only when I reboot the main server the backup server takes over. in the logs I get : heartbeat[30476]: 2012/03/20_18:51:57 WARN: string2msg_ll: node [node1] failed authentication heartbeat[30476]: 2012/03/20_18:51:58 WARN: string2msg_ll: node [node02] failed authentication the authkeys is identical (copied from one to another). this is my ha.cf: logfile /var/log/ha-log logfacility local0 keepalive 2 deadtime 30 initdead 120 bcast eth0 udpport 694 auto_failback on node server01.com node server02.com haresources : server01.com 38.108.117.3 aim chat any idea how to fix the problem so if a service stops the other server take over Thanks! E.

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• ubuntu server 10 - slow and can't remove desktop environment

  - by Alex

  i'm running ubuntu server 10.10 with the desktop environment. simple page requests are taking over 5 seconds even when connecting to the server through our local network. i believe this is partially related to having the desktop environment installed, as the server worked faster (but not as fast as it should considering that it's on the local network), but tasksel fails every time (aptitude failed 100). my knowledge of networking and linux in general is limited. would really appreciate ideas on how i can troubleshoot this problem. oh also, in the system monitor, one of the processors is almost always around 100%. i doubt this is normal too....

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• How to use Ralink RT2501/RT2573 as wifi access point in Debian Linux

  - by user60813

  Hi, I have a fit-PC server with Debian GNU/Linux (Lenny). I would like to use it as a wifi access point since my Linksys WRT54GS has become unstable. I have a USB Ralink wifi NIC. When I insert the card to USB I can see this with lsusb: Bus 001 Device 002: ID 148f:2573 Ralink Technology, Corp. RT2501/RT2573 Wireless Adapter I have tried following various HOWTOs on using wifi card as AP in Linux, however, it seems that the card cannot go into monitor mode. I believe this is because I must use a newer driver or upload non-free firmware or something like that. I have tried installed wicd, but it does not help. I bought this wifi adapter because I was told that it is one of the most common used Linux supported wifi cards that can be used as access point and a lot of other stuff. So my question is: How do I set up this USB wifi card as wireless access point in Debian Lenny?

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• My internet connection just got really slow - How can I troubleshoot it?

  - by Walden

  A few days ago my connection became really slow. I have DSL which should be 3mb down and 768k up. I'm lucky if I get 768k down and 200k up. It sucks. I called my ISP, Verizon and they did some sort of line test and told me the problem was on my end. I rebooted my modem several times, like they told me. I'm not really sure why I even bothered calling them, the guy on the other end was just reading stuff out of a notebook - pretty useless. So, I checked my network traffic in windows resource monitor, and there doesn't seem to be anything there hogging the bandwidth. What else could be slowing my connection down on my PC? on my router? Something else?

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• 802.11 Capture Frame

  - by ALi

  I am using wireshark in monitor mode to capture all the frame. I buffered all the QosData in order to calculate the biterate of each station on the network. I calculate the biterate but it is not an accurate value. what i need to know is when the station use the network alone and when it uses it with another station? i know if two station with different wifi card for exemple ( st1 802.11g 54 Mb/s, st2 802.11n 300 Mb/s) if st1 uses alone the line the biterate used is 28 MB/s and if st2 uses alone the network the bit rate increase to approximately 150Mb/s but if the two station use the network at the same time the st1 lost about 80% of its bit rate because of the st1 wifi card thx in advance

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• How to vertically split widescreen into two virtual workspaces on ubuntu/gnome?

  - by David

  My new laptop has a big 16:9 screen, and I'm finding it hard to fully utilize it during the 95% of the time that I'm not watching HD movies on it. I'd like to set it up as a kind of virtual dual screen by splitting the physical screen into two workspaces. I know I could arrange my windows manually, but I'd like to be able to maximize a window and have it only consume half the monitor, and have its pop up dialogs centered on its half-screen, that sort of thing. Is there some kind of plug in available to do this? Thanks in advance for any pointers.

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• Monitoring/logging a malfunctioning internet connection

  - by Pekka

  I have a mysterious internet connection problem: Every 15-20 minutes, the connection will become very slow, and take 2-3 minutes for anything to load. I've had a technician from the ISP over here to test the hardware, and everything is in pristine condition. They have no other explanation than a configuration error on my machine, a possibility I can exclude 90% because I'm experiencing the same problems with another machine. I will have to monitor the situation now, and I would like to run a program that logs when internet connections become slow. I thought about putting something together using at and wget. Does anybody know of some other tool for this that does this out of the box - maybe something with an adjustable request frequency, logging connection speeds etc.?

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• Is my disk hot or not?

  - by adriangrigore

  I am trying to figure out the temperature of my dedicated server's harddisk. For this purpose, I've downloaded HDTune to monitor the S.M.A.R.T. Status. The problem is that the current temperature for "C2 Temperature" is 73 degrees celsius, but the little thermometer on top of the window shows 27 degrees celsius. See this screenshot: http://screencast.com/t/OGJhZGIxND Another monitoring software (Anfibia Reactor) shows similar behavior: Disk temperature is around 30 degrees, but it says that the disk is too hot. So, is my disk hot or not? Since this is a dedicated server, I can't just open the case and put a thumb on it.

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• Reducing the time between checks on a Nagios server

  - by Farooq Hussain

  Can anyone let me know how I would reduce time between Last Check Time and Next Scheduled Check on a particular service. I have a very critical task to monitor and the time between checks is currently 5 minutes, which is too long for this service. Can I reduce that time? I need this to be 1 minute or even 30 seconds. I want Nagios to check this service every 30 seconds. I currently have defined the service as follows: define service{ use local-service host_name OpenSIP,test-RTSIP service_description SIP Registration check_command check_nrpe!check_sipreg check_freshness 0 freshness_threshold 900 active_checks_enabled 1 passive_checks_enabled 1 }

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• Which is the best opensource IT infra management s/w?

  - by karthick

  I am looking for some opensource IT infrastructure management s/w which should be able to monitor, manage servers & pc's, network devices, printers etc and it should have patch management, software inventory, user activity data etc And I am planning to have it on a linux server and it should be manageable for both linux and windows machines. I have found many while googling, but I don't know which is the best one. So anyone please suggest me, which is the best one I am looking for?.... Thanks... Your help is greatly appreciated..

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• Why does waking a PC up with a timer act differently than with the power button?

  - by Dan Rasmussen

  I have a Windows 7 machine set up as a server. It has no monitor and is only accessed through remote desktop. I set up two scheduled tasks, one to put the computer to sleep at night and another to wake it up in the morning. When it's woken up from sleep via a timer, it stays awake for only a couple minutes before going back to sleep. When woken up by pushing the power button, however, it stays awake all the way until the sleep timer. Why does my PC behave differently in these two scenarios? I have set the PC not to prompt for a user's password on wake, since I worried that the login screen might follow different power rules. I tried SmartPower Configuration but had the same problems. I can provide more details if questions are asked in the comments, but I'm not sure what's relevant.

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• Monitoring on java daemon on centos

  - by user111196

  I have a java application which I run using yasjw tool as a daemon. I need to monitor it in case it goes down I need some kind of alert or even restart it. Is there any tool can help me do this on centos environment? The results of ps -ef | grep java root 3109 1 0 Apr06 ? 00:04:35 /usr/java/jdk1.6.0_18/bin/java -Dwrapper.pidfile=/var/run/wrapper.commServer.pid -Dwrapper.service=true -Dwrapper.visible=false -jar /usr/local/yajsw-beta-10.2/wrapper.jar -c /usr/local/yajsw-beta-10.2/conf/wrapper.conf root 3132 3109 0 Apr06 ? 00:25:26 /usr/java/jdk1.6.0_18/bin/java -classpath /usr/local/yajsw-beta-10.2/./wrapperApp.jar:/usr/local -Xrs -Dwrapper.service=true -Dwrapper.console.visible=false -Dwrapper.visible=false -Dwrapper.pidfile=/var/run/wrapper.commServer.pid -Dwrapper.config=/usr/local/yajsw-beta-10.2/conf/wrapper.conf -Dwrapper.port=15003 -Dwrapper.key=4276015160565963367 -Dwrapper.teeName=4276015160565963367$1333699547154 -Dwrapper.tmpPath=/tmp org.rzo.yajsw.app.WrapperJVMMain root 23986 23945 0 16:53 pts/0 00:00:00 grep java pidof java 3132 3109

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• SQL 2005 Log Shipping - Was working, now isnt!

  - by Jim

  Hello, I had log shipping working between two SQL 2005 server fine. I suspect that a job was added to the source server which backed up the transaction log to disk (nothing to do with the existing log shipping job). As I understand it, if you do this then log shipping will fail to work. Sure enough, it no longer works. I've deleted the job which had just been created. Log shipping still does not work. I've rebooted both servers and, again, Log shipping does not work. I'm at a loss now... all I get is the folloing error: The log shipping secondary database XXXXXXXXXX has restore threshold of 45 minutes and is out of sync. No restore was performed for 5882 minutes. Restored latency is 15 minutes. Check agent log and logshipping monitor information. Any help appreciated! Thanks in advance.

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• Connecting OS X MacBook Pro to DirecTV DVR

  - by user14293

  I have a DirecTV DVR which soon will be replaced. The local phone carrier has wired fiber-to-the-door and that DirecTV sat service will soon be history. I have irreplaceable video recordings on the DVR's disk I would like to salvage. I'd like to connect my MacBook Pro (OS X 10.5.3) to the DVR (male HDMI to male Thunderbolt) and treat the MAC as a TV monitor. I'd like to capture the video stream to a file and then burn it to DVD. This is for my use only, not for distribution. Still researching video capture. Don't yet have a solution. Maybe there isn't one. Any ideas?

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• Monitoring over Time with Nagios: How?

  - by David

  Nagios in its standard usage monitors with point-in-time checks: either something is - or is not - true. Other tools like SGI's PCP, HP's MeasureWare, and SEC provide monitoring over time - monitoring things like average disk access time over the last five minutes, or other similar items. Is there anything like this for Nagios? I'm already running NDOUtils, which seems like a natural source for such data. I'd like to have something that would monitor and fire off alarms based on a time-based check using historical data. Is there anything like this for Nagios?

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• Nagios3 check_httpname gives 503 response; from command line I get a 200 response

  - by Michael T. Smith

  We're using Nagios to monitor our site (and a bunch of other stuff.) For some odd reason, when I test out the command /usr/lib/nagios/plugins/check_http -H 'domainname.com' the response that comes back is HTTP/1.1 200 OK but when I set up the service to do it: # Check that domain is running define service { hostgroup_name hostgroup service_description host site check_command check_httpname!domainname.com use generic-service notification_interval 1; set > 0 if you want to be renotified } the response that comes back is HTTP/1.1 503 Service Unavailable. Does anyone know why this would be happening?

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• bad ram or bad motherboard

  - by user39508

  I have a computer which crashes after about 5-45 seconds of operation. It can run memtest86+, and it doesn't display any errors, but it doesn't prevent it from crashing within the time frame listed above. The heat sink appears to be installed correctly, and I don't think it is related to overheating. The motherboard is connected to the ram and a monitor, nothing else is installed. The processor is an atom 330, running memtest86+ 4.0. Any insight into if the ram is bad or if it is the motherboard/psu/cpu? Thanks!

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• How to calculate time spent for Linux system administration?

  - by Jaakko

  I would love figuring out how much time I actually have spent in shell performing administrative duties. For billing of course, this information is not sufficient, but it would be helpful to figure out how much time I have actually spent in shell. My question is: How anyone got tips on how to calculate time spent in shell (in hours + minutes), let's say per user account? Could anyone recommend a software that could be used to analyze this time? Optionally I would like to know about ways how to categorise time spent (e.g. 1 hour for Apache, 2 hours for Samba, etc.) Also, your takes on how you monitor your admin time, are also much appreciated! To narrow down the problem, I am specifically interested in ways of tracking time spent in shell for Linux system administration

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• laptop does not boot

  - by devan

  I have hp probook 4520s lap. But now it does not boot. When I press switch on button fans are working but it shows black screen. HDD light just blink one or two times when start but it will not continue. And usually web cam light should blink one time when startup but it doesn't. I connect to different monitor but couldn't see a output. This lap bought 3 months before but it doesn't have international warranty. Therefore I can not do anything. If someone can provide any clue or suggestion that what happened and what should I do, appreciated. thank you.

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• Office jukebox systems

  - by jonayoung

  We're looking for a good office jukebox solution where staff can select songs via a web interface to be played over the central set of speakers. Must haves: Web Interface RSS / easy to scrap display of currently playing songs Ability to play mp3s and manage an ordered playlist. Good cataloguing of media. Multiple OSs supported as clients - Windows, Mac, Fedora Linux (will probably be accomplished by virtue of a web interface). We have tried XBMC which worked well as a proof of concept however the web interface is just too immature and has too many bugs for a reliable multi-user solution. I believe the same will be true of boxee. Nice to have: Ability to play music videos onto a monitor Ability to listen to radio streams specifically Shoutcast and the BBC. Ability to run on Linux is a nice to have but windows solutions which worked well would certainly be considered. I am aware of question 61404 and don't believe this to be a duplicate due to the specific requirements.

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• pfsense CARP - wan failure on firewall

  - by eldblz

  I have recently configured 2 firewall (on 2 DELL PowerEdge R210II with ESXI 5.1) with pfsense. We have several LANs and 2 WANs. Everything is running fine but i have a strange behavior: i can access internet from alla LANs but not from the firewall (itself). For example the firewall cannot retrive package information or if i setup a gatway monitor ip (like google 8.8.8.8 ) this fails. These are the screenshots of firewall configuration: http://imgur.com/a/LNuMz#0 ATM i kept firewall rules to minimum to avoid problem or conflicts. Any ideas how to solve the problem? Thank you in advance.

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• Windows 7 - sharing file - slow seek time?

  - by progtick

  I do not want to copy the files. I simply have video files (.flv) on one computer and I would like another computer user to watch them without copying. Playback is fine, but seek time (as in if you move the cursor to skip some portion of the video) takes forever! I thought wireless speed might be the culprit, so I wired the two computer. Maybe I saw some improvement but still so bad. It's 1 Gbps! (I know real speed will vary, but before I monitor real speed and such, do I have reasonable issue? Or am I bound to have very slow seek time?) What is going on? I must mention some of these files are huge!

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• Tomcat memory usage grows until crash with no GC run

  - by Phil

  I'm administrating a server running Tomcat that is getting a lot of traffic lately. If I monitor memory usage in Task Manager I can see the memory usage growing and eventually tomcat crashes around the 1GB mark. Here's the memory relevent bits I've set in Tomcat Properties (this is a Windows Server): Intial memory pool: 1024 MB Maximum memory pool: 1024 MB -XX:MaxPermSize=256M The weird thing is since these problems arose I've deployed Lambda Probe to the Tomcat instance and the memory usage values I see there are much lower, for example Task Manager might show 467MB used while the "Total" used in Probe is 212 MB. Also, the Maximum Total listed in Probe is 1.29GB, when I would have expected 1GB, the maximum memory set above. If I force the garbage collector to run using Probe, I can keep Tomcat from crashing for a while (indefinitely, AFAIK). So why doesn't the GC run automatically and stop Tomcat from crashing? Thanks.

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