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• faking NAT with a VMware distributed switch across multiple hosts

  - by romant

  I need to construct a NAT for certain machines within the network. Wish to do this with dvSwitch - as it seems the logical way of attacking the problem as in this scenario there's just under 30 hosts. In order for the NAT'ed VM's to have access to the 'real' network. I am providing a 'router' VM, which will have access to the WAN/outside network, and also act as the DHCP server for the NAT'ed machines. Problem Space When the machines connected to the NAT interface and the router are on the same host, then they get an IP from the router VM, and work perfectly (routed outside). Unfortunately machines on other Hosts that are connected to the dvSwitch do not get an IP and further tcpdump shows no network data getting through across the hosts within the dvSwitch. Has anyone achieved a NAT solution using a dvSwitch before that they could share?! Thank you. EDIT: Including the diagram.

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• WS2008R2 / W7PRO: Cannot rename folder - folder redirection

  - by castor

  After few months from migrating one of my networks on Active Directory this issue started. A few users are encountering an issue from time to time - they cannot rename folders and files on desktop. The system throws an error saying the folder or file is already in use. Folder redirection takes place in this scenario (Desktop and My Documents) Subnet with user PCs is different from subnet with servers (Cisco ASA5505 Security Plus between - all inspection policies disabled on these interfaces) Users are running Windows 7 Professional x86 Server is running Windows Server 2008 R2 Standard Any ideas?

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• Emacs doesn't load gui.

  - by D Connors

  Hi, whenever I run emacs or emacs23 on terminal I just get the following output: ** (emacs:2620): CRITICAL **: menu_proxy_module_load: assertion `dbusproxy != NULL' failed And the gui doesn't load, and emacs' window never opens. The emacs process doesn't actually crash (the terminal stays busy, and I can see the emacs23 process running with ps -e). I've tried running it with the -D --debug-init arguments, but the same thing happens and the output is exactly the same. However, if I run emacs -nw it successfully runs emacs in terminal mode as if nothing were wrong. Strangely, this problem only started happening the second time I ran emacs today. The first time it worked perfectly fine. Since then, I've tried rebooting and I've tried purging the emacs installation, to no success. I haven't installed any new packages today, but I might have upgraded some, could that be the reason? Is there a way to find out which packages were installed/upgraded today? Thanks I'm running Ubuntu Lucid

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• resolve access violation exception (0xC0000005) crashing IIS app pool

  - by Joseph

  IIS 7.5, server 2008 r2, classic asp and asp .net 2.0, 3.5 website same server, same app pool. The past 4 weeks thousands of these errors 'C0000005' are occurring. I know from IIS debug diag tool that 'C0000005' is an access violation error. Below is the top line from my debug diag report. In w3wp__PID__6656__Date__01_08_2011__Time_01_42_46AM__281__First Chance Access Violation.dmp the assembly instruction at asp!CActiveScriptEngine::GetApplication+27 in \\?\C:\Windows\System32\inetsrv\asp.dll from Microsoft Corporation has caused an access violation exception (0xC0000005) when trying to read from memory location 0x00000000 on thread 29 Thread 29 - System ID 6736 Entry point 0x00000000 Create time 1/8/2011 12:46:26 AM Time spent in user mode 0 Days 00:00:00.140 Time spent in kernel mode 0 Days 00:00:00.078 Function Source asp!CActiveScriptEngine::GetApplication+27 vbscript!COleScript::GetDebugApplicationCoreNoRef+2b vbscript!COleScript::FDebuggerEnabled+30 vbscript!COleScript::SetScriptSite+cd asp!CActiveScriptEngine::Init+125 asp!CScriptManager::GetEngine+252 asp!AllocAndLoadEngines+28f asp!ExecuteGlobal+17a asp!Execute+b5 asp!CHitObj::ViperAsyncCallback+3fc asp!CViperAsyncRequest::OnCall+6a comsvcs!CSTAActivityWork::STAActivityWorkHelper+32 ole32!EnterForCallback+f4 ole32!SwitchForCallback+1a8 ole32!PerformCallback+a3 ole32!CObjectContext::InternalContextCallback+15b ole32!CObjectContext::DoCallback+1c comsvcs!CSTAActivityWork::DoWork+12f comsvcs!CSTAThread::DoWork+18 comsvcs!CSTAThread::ProcessQueueWork+37 comsvcs!CSTAThread::WorkerLoop+135 msvcrt!_endthreadex+44 msvcrt!_endthreadex+ce kernel32!BaseThreadInitThunk+e ntdll!__RtlUserThreadStart+70 ntdll!_RtlUserThreadStart+1b BELOW is the faulting module. ASP report Executing ASP requests 0 Request(s) ASP templates cached 0 Template(s) ASP template cache size 0.00 Bytes Loaded ASP applications 1 Application(s) ASP.DLL Version 7.5.7600.16620 ASP application report ASP application metabase key Physical Path Virtual Root Session Count 0 Session(s) Request Count 0 Request(s) Session Timeout 0 minutes(s) Path to Global.asa Server side script debugging enabled False Client side script debugging enabled False Out of process COM servers allowed False Session state turned on False Write buffering turned on False Application restart enabled False Parent paths enabled False ASP Script error messages will be sent to browser False ASP!CACTIVESCRIPTENGINE::GETAPPLICATION+27In w3wp__PID__6656__Date__01_08_2011__Time_01_42_46AM__281__First Chance Access Violation.dmp the assembly instruction at asp!CActiveScriptEngine::GetApplication+27 in \\?\C:\Windows\System32\inetsrv\asp.dll from Microsoft Corporation has caused an access violation exception (0xC0000005) when trying to read from memory location 0x00000000 on thread 29 recent events: server was being brute forced by hackers all of Dec and probably earlier, they weren't able to gain access but did get a virus on and blasted out spam. insatlled AVG and about the 17 or 22 latest patches. after that the app pool started crashing and the server has crashed a couple times since then. I am in no mans land as I am a developer and not a sys admin but I have to assume many roles. So I'm reaching out for help. Sometimes I will see hundreds of these 'C0000005' scriptengine errors in the event log in a matter of seconds and other times just a few times an hour. I googled this line 'ASP!CACTIVESCRIPTENGINE::GETAPPLICATION' and got nothing. Its like the function don't exist or something. I have spent many hours google-ing to no avail and am now turning to the experts on the forums. Thank you for your help

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• Improving TCP performance over a gigabit network lots of connections and high traffic for storage and streaming services

  - by Linux Guy

  I have two servers, Both servers hardware Specification are Processor : Dual Processor RAM : over 128 G.B Hard disk : SSD Hard disk Outging Traffic bandwidth : 3 Gbps network cards speed : 10 Gbps Server A : for Encoding videos Server B : for storage videos andstream videos over web interface like youtube The inbound bandwidth between two servers is 10Gbps , the outbound bandwidth internet bandwidth is 500Mpbs Both servers using public ip addresses in public and private network Both servers transfer and connection on nginx port , and the server B used for streaming media , like youtube stream videos Both servers in same network , when i do ping from Server A to Server B i got high time latency above 1.0ms , the time range time=52.7 ms to time=215.7 ms - This is the output of iftop utility 353Mb 707Mb 1.04Gb 1.38Gb 1.73Gb mqqqqqqqqqqqqqqqqqqqqqqqqqqqvqqqqqqqqqqqqqqqqqqqqqqqqqqqvqqqqqqqqqqqqqqqqqqqqqqqqqqqvqqqqqqqqqqqqqqqqqqqqqqqqqqqvqqqqqqqqqqqqqqqqqqqqqqqqqqq server.example.com => ip.address 6.36Mb 4.31Mb 1.66Mb <= 158Kb 94.8Kb 35.1Kb server.example.com => ip.address 1.23Mb 4.28Mb 1.12Mb <= 17.1Kb 83.5Kb 21.9Kb server.example.com => ip.address 395Kb 3.89Mb 1.07Mb <= 6.09Kb 109Kb 28.6Kb server.example.com => ip.address 4.55Mb 3.83Mb 1.04Mb <= 55.6Kb 45.4Kb 13.0Kb server.example.com => ip.address 649Kb 3.38Mb 1.47Mb <= 9.00Kb 38.7Kb 16.7Kb server.example.com => ip.address 5.00Mb 3.32Mb 1.80Mb <= 65.7Kb 55.1Kb 29.4Kb server.example.com => ip.address 387Kb 3.13Mb 1.06Mb <= 18.4Kb 39.9Kb 15.0Kb server.example.com => ip.address 3.27Mb 3.11Mb 1.01Mb <= 81.2Kb 64.5Kb 20.9Kb server.example.com => ip.address 1.75Mb 3.08Mb 2.72Mb <= 16.6Kb 35.6Kb 32.5Kb server.example.com => ip.address 1.75Mb 2.90Mb 2.79Mb <= 22.4Kb 32.6Kb 35.6Kb server.example.com => ip.address 3.03Mb 2.78Mb 1.82Mb <= 26.6Kb 27.4Kb 20.2Kb server.example.com => ip.address 2.26Mb 2.66Mb 1.36Mb <= 51.7Kb 49.1Kb 24.4Kb server.example.com => ip.address 586Kb 2.50Mb 1.03Mb <= 4.17Kb 26.1Kb 10.7Kb server.example.com => ip.address 2.42Mb 2.49Mb 2.44Mb <= 31.6Kb 29.7Kb 29.9Kb server.example.com => ip.address 2.41Mb 2.46Mb 2.41Mb <= 26.4Kb 24.5Kb 23.8Kb server.example.com => ip.address 2.37Mb 2.39Mb 2.40Mb <= 28.9Kb 27.0Kb 28.5Kb server.example.com => ip.address 525Kb 2.20Mb 1.05Mb <= 7.03Kb 26.0Kb 12.8Kb qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq TX: cum: 102GB peak: 1.65Gb rates: 1.46Gb 1.44Gb 1.48Gb RX: 1.31GB 24.3Mb 19.5Mb 18.9Mb 20.0Mb TOTAL: 103GB 1.67Gb 1.48Gb 1.46Gb 1.50Gb I check the transfer speed using iperf utility From Server A to Server B # iperf -c 0.0.0.2 -p 8777 ------------------------------------------------------------ Client connecting to 0.0.0.2, TCP port 8777 TCP window size: 85.3 KByte (default) ------------------------------------------------------------ [ 3] local 0.0.0.1 port 38895 connected with 0.0.0.2 port 8777 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.8 sec 528 KBytes 399 Kbits/sec My Current Connections in Server B # netstat -an|grep ":8777"|awk '/tcp/ {print $6}'|sort -nr| uniq -c 2072 TIME_WAIT 28 SYN_RECV 1 LISTEN 189 LAST_ACK 139 FIN_WAIT2 373 FIN_WAIT1 3381 ESTABLISHED 34 CLOSING Server A Network Card Information Settings for eth0: Supported ports: [ TP ] Supported link modes: 100baseT/Full 1000baseT/Full 10000baseT/Full Supported pause frame use: No Supports auto-negotiation: Yes Advertised link modes: 10000baseT/Full Advertised pause frame use: No Advertised auto-negotiation: Yes Speed: 10000Mb/s Duplex: Full Port: Twisted Pair PHYAD: 0 Transceiver: external Auto-negotiation: on MDI-X: Unknown Supports Wake-on: d Wake-on: d Current message level: 0x00000007 (7) drv probe link Link detected: yes Server B Network Card Information Settings for eth2: Supported ports: [ FIBRE ] Supported link modes: 10000baseT/Full Supported pause frame use: No Supports auto-negotiation: No Advertised link modes: 10000baseT/Full Advertised pause frame use: No Advertised auto-negotiation: No Speed: 10000Mb/s Duplex: Full Port: Direct Attach Copper PHYAD: 0 Transceiver: external Auto-negotiation: off Supports Wake-on: d Wake-on: d Current message level: 0x00000007 (7) drv probe link Link detected: yes ifconfig server A eth0 Link encap:Ethernet HWaddr 00:25:90:ED:9E:AA inet addr:0.0.0.1 Bcast:0.0.0.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1202795665 errors:0 dropped:64334 overruns:0 frame:0 TX packets:2313161968 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:893413096188 (832.0 GiB) TX bytes:3360949570454 (3.0 TiB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:2207544 errors:0 dropped:0 overruns:0 frame:0 TX packets:2207544 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:247769175 (236.2 MiB) TX bytes:247769175 (236.2 MiB) ifconfig Server B eth2 Link encap:Ethernet HWaddr 00:25:90:82:C4:FE inet addr:0.0.0.2 Bcast:0.0.0.2 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:39973046980 errors:0 dropped:1828387600 overruns:0 frame:0 TX packets:69618752480 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:3013976063688 (2.7 TiB) TX bytes:102250230803933 (92.9 TiB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:1049495 errors:0 dropped:0 overruns:0 frame:0 TX packets:1049495 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:129012422 (123.0 MiB) TX bytes:129012422 (123.0 MiB) Netstat -i on Server B # netstat -i Kernel Interface table Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg eth2 9000 0 42098629968 0 2131223717 0 73698797854 0 0 0 BMRU lo 65536 0 1077908 0 0 0 1077908 0 0 0 LRU I Turn up send/receive buffers on the network card to 2048 and problem still persist I increase the MTU for server A and problem still persist and i increase the MTU for server B for better connectivity and transfer speed but it couldn't transfer at all The problem is : as you can see from iperf utility, the transfer speed from server A to server B slow when i restart network service in server B the transfer in server A at full speed, after 2 minutes , it's getting slow How could i troubleshoot slow speed issue and fix it in server B ? Notice : if there any other commands i should execute in servers for more information, so it might help resolve the problem , let me know in comments

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• Environment variables in Weblogic Managed Server with SSL nodemanager

  - by Eric Darchis

  We have a C legacy application start with JNI that requires environment variables. Not java -Djava.library.path -Dvar=foo as these are purely java. I need real environment variables. When we setup our domains, we usually use the SSH method to start the node managers. This works fine and the env variables are set properly. Recently the sysadmin has decided for a few reasons to use the SSL mode for nodemanagers. The servers start but the environment variables are not set. I checked with "pargs -e" (this is a Solaris machine) that the env variable was indeed not present from the nodemanager and for the managed server. Is SSL starting the managed server without running the .sh scripts or I am missing a parameter somewhere ?

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• redundant/multi-site terminal server

  - by Adam

  Hi We have a Hyper-V cluster running 5 virtual terminal servers using HA. We need to be able make this system redundant and so if this site was to fail our users could log into the backup system at another location and access their data via the terminal servers. Any ideas? We were thinking of maybe using a NAS which replicated the data to the other location in real-time(pass-through disks)? and having a similar Hyper-V cluster setup in the backup location. However we would need to create the users in both location and create a virtual mirror without the data ie applications, directories, settings etc. Is this the best way to achieve this? We have read that using Hyper-v pass through disks is a big performance de-grade.

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• How can a single disk in a hardware SATA RAID-10 array bring the entire array to a screeching halt?

  - by Stu Thompson

  Prelude: I'm a code-monkey that's increasingly taken on SysAdmin duties for my small company. My code is our product, and increasingly we provide the same app as SaaS. About 18 months ago I moved our servers from a premium hosting centric vendor to a barebones rack pusher in a tier IV data center. (Literally across the street.) This ment doing much more ourselves--things like networking, storage and monitoring. As part the big move, to replace our leased direct attached storage from the hosting company, I built a 9TB two-node NAS based on SuperMicro chassises, 3ware RAID cards, Ubuntu 10.04, two dozen SATA disks, DRBD and . It's all lovingly documented in three blog posts: Building up & testing a new 9TB SATA RAID10 NFSv4 NAS: Part I, Part II and Part III. We also setup a Cacit monitoring system. Recently we've been adding more and more data points, like SMART values. I could not have done all this without the awesome boffins at ServerFault. It's been a fun and educational experience. My boss is happy (we saved bucket loads of $$$), our customers are happy (storage costs are down), I'm happy (fun, fun, fun). Until yesterday. Outage & Recovery: Some time after lunch we started getting reports of sluggish performance from our application, an on-demand streaming media CMS. About the same time our Cacti monitoring system sent a blizzard of emails. One of the more telling alerts was a graph of iostat await. Performance became so degraded that Pingdom began sending "server down" notifications. The overall load was moderate, there was not traffic spike. After logging onto the application servers, NFS clients of the NAS, I confirmed that just about everything was experiencing highly intermittent and insanely long IO wait times. And once I hopped onto the primary NAS node itself, the same delays were evident when trying to navigate the problem array's file system. Time to fail over, that went well. Within 20 minuts everything was confirmed to be back up and running perfectly. Post-Mortem: After any and all system failures I perform a post-mortem to determine the cause of the failure. First thing I did was ssh back into the box and start reviewing logs. It was offline, completely. Time for a trip to the data center. Hardware reset, backup an and running. In /var/syslog I found this scary looking entry: Nov 15 06:49:44 umbilo smartd[2827]: Device: /dev/twa0 [3ware_disk_00], 6 Currently unreadable (pending) sectors Nov 15 06:49:44 umbilo smartd[2827]: Device: /dev/twa0 [3ware_disk_07], SMART Prefailure Attribute: 1 Raw_Read_Error_Rate changed from 171 to 170 Nov 15 06:49:45 umbilo smartd[2827]: Device: /dev/twa0 [3ware_disk_10], 16 Currently unreadable (pending) sectors Nov 15 06:49:45 umbilo smartd[2827]: Device: /dev/twa0 [3ware_disk_10], 4 Offline uncorrectable sectors Nov 15 06:49:45 umbilo smartd[2827]: Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error Nov 15 06:49:45 umbilo smartd[2827]: # 1 Short offline Completed: read failure 90% 6576 3421766910 Nov 15 06:49:45 umbilo smartd[2827]: # 2 Short offline Completed: read failure 90% 6087 3421766910 Nov 15 06:49:45 umbilo smartd[2827]: # 3 Short offline Completed: read failure 10% 5901 656821791 Nov 15 06:49:45 umbilo smartd[2827]: # 4 Short offline Completed: read failure 90% 5818 651637856 Nov 15 06:49:45 umbilo smartd[2827]: So I went to check the Cacti graphs for the disks in the array. Here we see that, yes, disk 7 is slipping away just like syslog says it is. But we also see that disk 8's SMART Read Erros are fluctuating. There are no messages about disk 8 in syslog. More interesting is that the fluctuating values for disk 8 directly correlate to the high IO wait times! My interpretation is that: Disk 8 is experiencing an odd hardware fault that results in intermittent long operation times. Somehow this fault condition on the disk is locking up the entire array Maybe there is a more accurate or correct description, but the net result has been that the one disk is impacting the performance of the whole array. The Question(s) How can a single disk in a hardware SATA RAID-10 array bring the entire array to a screeching halt? Am I being naïve to think that the RAID card should have dealt with this? How can I prevent a single misbehaving disk from impacting the entire array? Am I missing something?

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• Aironet 1200's Auto-Channel Feature: When should it be used?

  - by Josh Brower

  In our building we have around 25 1200 series Aironets, with a bit of overlap in some areas. Up until this point, we have had them deployed in alternating 1/6/11 channels, but we are wondering if we would get better performance if we used the auto-channel select feature. In looking around, I have seen comments that this feature should not be used as the WAP does a channel scan only on the radio startup, but I have not found this in any Cisco docs. Anybody have anymore information, or real-world experience with this feature? Thanks! -Josh

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• Multiple Copies of Windows Calculator

  - by Brian Boatright

  Just did a clean install of Win7 x64. I have a Microsoft Ergo Keyboard 4000 and use the calculator key a lot. Previously I could hit it and get multiple copies of calculator to popup. Now it will only show one copy of calculator. I tried adding a shortcut to the calculator app but it has the same limitation. However if I click the calculator icon it will open a new one each time. How can I fix this so each time I press the calculator key it will open a new copy?

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• MBP becomes very hot after using Xcode

  - by Globalhawk

  Hardware: MBP early 2011 version OS: Mountain lion App: Xcode 4.5.2 Problem: Every time when I start Xcode, 2 or 3 processes called "git" start running. But when I quit Xcode the "git" process won't quit and are still using a lot of CPU. Then the computer becomes quite hot and the battery gets drained very quickly. If I manually kill these processes the problem is gone. I tried to reinstall Xcode several times but the problem comes back every time. It drives me crazy. Any help will be appreciated!

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• Add a hook to run when NetworkManager connects

  - by rplevy

  What would be a good way to make a script run every time my computer connects to the network in Ubuntu? Would I somehow use dbus to do this? Background: when I'm on the train I run a short Perl script to click a button on the splash page. That way I can immediately use the internet without having to manually visit a pointless website. My script is a near-perfect solution, but it would be perfect if it could run automatically any time I connect to the network.

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• How to configure 1080p HDTV as a monitor

  - by Robot

  I've read several posts that almost answer my question, but not quite. I have a Samsung LN32C530 1080p HDTV I'd like to use as a monitor. I was reasonably successful getting the prior 720p model to work ok using SwitchResX, but I think I just got lucky with the parameters (1360x768@60Hz). I tried the expected (1920x1080@60Hz) values and "nearby" ones, with no luck. Older 720p params actually work, but I get the same small real estate as the older model TV. Trying values near 1080p always displays an image that doesn't match the screen size and is very jagged which makes me think interpolation is making things worse. Also, SwitchResX has a bunch of parameters other than H x W ("porch" etc), and I don't know how they all work together. Any help?

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• Configure spamassassin to mark very similar messages as spam

  - by Caleb Gray

  Users on my server have been receiving spam, consistently, for some time now. I have most of spamassassin's plugins enabled, and I have made sure to enable verbose logging, where I can see that all of the plugins are working. Why is it, then, that my users are able to receive the same exact junk mail several times in a day without the message being flagged in some way? Here are the relevant headers of an email that I personally have received several copies of: X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on sub.domain.tld X-Spam-Level: *** X-Spam-Status: No, score=3.0 required=4.0 tests=BAYES_50,FSL_HELO_NON_FQDN_1, HELO_NO_DOMAIN,HTML_MESSAGE,RCVD_IN_BRBL_LASTEXT,RDNS_NONE autolearn=no version=3.3.1 Have I accidentally missed the plugin that can see that I, and others, have received the same message multiple times in a short period of time?

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• Log monitoring using Zabbix

  - by Supratik

  I am trying to monitor a log file using Zabbix 1.8.4. I created an item using the following details: Host: Zabbix server Description: logger_test Type: Zabbix agent (active) Key: log[/tmp/scribetest/test3/test3_current,error,,100] Type of Infromation: Log Update interval (in sec): 1 sec Keep history (in days): 90 Status: Active Applications: Log files I created a trigger and attached it with the item logger_test using the following details: Name: logger_test_trigger Expression: {Zabbix server:log[/tmp/scribetest/test3/test3_current,error,,100].str(error)}=1 Severity: disaster The above settings works fine for the first time but next time the trigger shows ZBX_NOTSUPPORTED and after that item also shows "not supported" message. Can you please tell me if anything I am doing wrong here ?

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• xen domUs crashes or unavailability

  - by Rush

  I've xen server with 8 domU. Server is Xeon E31270 with 16gb ram. I think it is enough for 8 machines. Sometimes domU's crashes and i can't figure out the reason. After crash i can connect to console and there is somthing like this: Oct 8 22:20:49 server kernel: [30892.320780] lowmem_reserve[]: 0 0 0 0 Oct 8 22:20:49 server kernel: [30892.320790] Node 0 DMA: 10*4kB 3*8kB 13*16kB 10*32kB 7*64kB 3*128kB 2*256kB 2*512kB 1*1024kB 2*2048kB 0*4096kB = 8080kB Oct 8 22:20:49 server kernel: [30892.320817] Node 0 DMA32: 648*4kB 2*8kB 1*16kB 0*32kB 1*64kB 0*128kB 0*256kB 0*512kB 1*1024kB 1*2048kB 0*4096kB = 5760kB Oct 8 22:20:49 server kernel: [30892.320842] 1491 total pagecache pages Oct 8 22:20:49 server kernel: [30892.320847] 0 pages in swap cache Oct 8 22:20:49 server kernel: [30892.320852] Swap cache stats: add 0, delete 0, find 0/0 Oct 8 22:20:49 server kernel: [30892.320858] Free swap = 0kB Oct 8 22:20:49 server kernel: [30892.320862] Total swap = 0kB Oct 8 22:20:49 server kernel: [30892.324024] 524288 pages RAM Oct 8 22:20:49 server kernel: [30892.324024] 11010 pages reserved Oct 8 22:20:49 server kernel: [30892.324024] 424467 pages shared Oct 8 22:20:49 server kernel: [30892.324024] 503538 pages non-shared Oct 8 22:20:49 server kernel: [30892.330308] apache2 invoked oom-killer: gfp_mask=0x200da, order=0, oom_adj=0 Oct 8 22:20:49 server kernel: [30892.330322] apache2 cpuset=/ mems_allowed=0 Oct 8 22:20:49 server kernel: [30892.330330] Pid: 23938, comm: apache2 Not tainted 2.6.32-5-xen-amd64 #1 Oct 8 22:20:49 server kernel: [30892.330337] Call Trace: Oct 8 22:20:49 server kernel: [30892.330349] [<ffffffff810b7180>] ? oom_kill_process+0x7f/0x23f Oct 8 22:20:49 server kernel: [30892.330358] [<ffffffff810b76a4>] ? __out_of_memory+0x12a/0x141 Oct 8 22:20:49 server kernel: [30892.330367] [<ffffffff810b77fb>] ? out_of_memory+0x140/0x172 Oct 8 22:20:49 server kernel: [30892.330376] [<ffffffff810bb59c>] ? __alloc_pages_nodemask+0x4e5/0x5f5 Oct 8 22:20:49 server kernel: [30892.330385] [<ffffffff810cc224>] ? do_wp_page+0x386/0x707 Oct 8 22:20:49 server kernel: [30892.330395] [<ffffffff8100c3a5>] ? __raw_callee_save_xen_pud_val+0x11/0x1e Oct 8 22:20:49 server kernel: [30892.330404] [<ffffffff8100c369>] ? __raw_callee_save_xen_pmd_val+0x11/0x1e Oct 8 22:20:49 server kernel: [30892.330412] [<ffffffff810cdfc7>] ? handle_mm_fault+0x7aa/0x80f Oct 8 22:20:49 server kernel: [30892.330422] [<ffffffff8130f906>] ? do_page_fault+0x2e0/0x2fc Oct 8 22:20:49 server kernel: [30892.330433] [<ffffffff8130d7a5>] ? page_fault+0x25/0x30 Oct 8 22:20:49 server kernel: [30892.330439] Mem-Info: Oct 8 22:20:49 server kernel: [30892.330443] Node 0 DMA per-cpu: Oct 8 22:20:49 server kernel: [30892.330450] CPU 0: hi: 0, btch: 1 usd: 0 Oct 8 22:20:49 server kernel: [30892.330463] CPU 1: hi: 0, btch: 1 usd: 0 Oct 8 22:20:49 server kernel: [30892.330466] Node 0 DMA32 per-cpu: Oct 8 22:20:49 server kernel: [30892.330469] CPU 0: hi: 186, btch: 31 usd: 0 Oct 8 22:20:49 server kernel: [30892.330472] CPU 1: hi: 186, btch: 31 usd: 60 Oct 8 22:20:49 server kernel: [30892.330476] active_anon:342076 inactive_anon:115398 isolated_anon:0 Oct 8 22:20:49 server kernel: [30892.330477] active_file:268 inactive_file:481 isolated_file:0 Oct 8 22:20:49 server kernel: [30892.330477] unevictable:1125 dirty:2 writeback:13 unstable:0 Oct 8 22:20:49 server kernel: [30892.330478] free:3410 slab_reclaimable:1718 slab_unreclaimable:6946 Oct 8 22:20:49 server kernel: [30892.330478] mapped:899 shmem:113 pagetables:35697 bounce:0 Oct 8 22:20:49 server kernel: [30892.330502] Node 0 DMA free:8036kB min:32kB low:40kB high:48kB active_anon:1144kB inactive_anon:1268kB active_file:8kB inactive_file:8kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:11792kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:224kB kernel_stack:16kB pagetables:1228kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no Oct 8 22:20:49 server kernel: [30892.330518] lowmem_reserve[]: 0 2004 2004 2004 Oct 8 22:20:49 server kernel: [30892.330523] Node 0 DMA32 free:5604kB min:5708kB low:7132kB high:8560kB active_anon:1367160kB inactive_anon:460324kB active_file:1064kB inactive_file:1916kB unevictable:4500kB isolated(anon):0kB isolated(file):0kB present:2052320kB mlocked:4500kB dirty:8kB writeback:52kB mapped:3600kB shmem:452kB slab_reclaimable:6872kB slab_unreclaimable:27560kB kernel_stack:3528kB pagetables:141560kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:992 all_unreclaimable? no Oct 8 22:20:49 server kernel: [30892.330539] lowmem_reserve[]: 0 0 0 0 Oct 8 22:20:49 server kernel: [30892.330544] Node 0 DMA: 1*4kB 2*8kB 13*16kB 10*32kB 7*64kB 3*128kB 2*256kB 2*512kB 1*1024kB 2*2048kB 0*4096kB = 8036kB Oct 8 22:20:49 server kernel: [30892.330579] Node 0 DMA32: 609*4kB 2*8kB 1*16kB 0*32kB 1*64kB 0*128kB 0*256kB 0*512kB 1*1024kB 1*2048kB 0*4096kB = 5604kB Oct 8 22:20:49 server kernel: [30892.330605] 1522 total pagecache pages Oct 8 22:20:49 server kernel: [30892.330610] 0 pages in swap cache Oct 8 22:20:49 server kernel: [30892.330615] Swap cache stats: add 0, delete 0, find 0/0 Oct 8 22:20:49 server kernel: [30892.330621] Free swap = 0kB Oct 8 22:20:49 server kernel: [30892.330625] Total swap = 0kB Oct 8 22:20:49 server kernel: [30892.333018] 524288 pages RAM Oct 8 22:20:49 server kernel: [30892.333018] 11010 pages reserved Oct 8 22:20:49 server kernel: [30892.333018] 424367 pages shared Oct 8 22:20:49 server kernel: [30892.333018] 503658 pages non-shared Seems like there isn't enough memory for this domU. But there is no any memory problems reported in munin monitoring: As you see system uses around 0.2G and 1G is available. So my question is: Is it xen specific problem, that real memory usage and memory usage that shows munin are different (I've never seen such problems oh real hardware machines)? Or maybe it is just monitoring problem, that can't catch moment when there is unusual high load and domU go down? And how I can to defeat this problem? it is really annoying to catch messages in e-mail that domU went down. Btw, such situation was when domU had 2G memory.

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• DLINK WBR-1310B Wireless Router seems to hang...

  - by Ira Baxter

  I have a brand new DLINK-1310B Wireless Router (box never before opened, although I bought it at the neighborhood computer junk store). I am using it at home (and in fact am using it at this instant from a wireless laptop). When operative, I can ping it at 192.168.0.1, and I can log into it from the PC attached to it by LAN and from the wireless PC at //192.168.0.1. In the course of the day since I've installed, it seems to have locked up 3 times. Each time the symptoms are my web browser (or other IP service, e.g., POP3) stops with a "No internet connection" error. Attempts to contact the router via 192.168.0.1 get no reaction, from either the wireless laptop or from the hardwired PC sitting next to it. It doesn't respond to pings to that address either. Power cycling the router fixes it. I've seen discussion in other questions about aging cheap electronics. Its too new to be aged. Anybody else seen this behavior with a DLINK-1310? Or do I just need to exchange it for another and try again? (I hate rolling dice, I bought the DLINK because a previous Linksys died of apparant heating problems, how many do I have to cycle through before I get something that works and is long-term stable?). Remarkably, nobody talks about how much software is in a router. Is the stuff just buggy? EDIT: Happened again, while I was working on the wireless Vista laptop. (Seems like once an hour?) I was a little more careful this time. The wireless laptop can ping it. It can't get the login screen. I visited the LAN-connected PC (takes me a minute to walk from the laptop to the PC at the other end of the house), and attempted to visit a random web page. Surprise, that worked! And, now, after a minute walking back to the laptop, I can reconnect the wireless laptop, and get to the login page from it. Strange the time/date has been reset back to 2002. (I'll swear I set it and saved the system configuration after updating the firmware; it made me redo every other bit of reconfiguration again). Is there something funny about wireless leases expiring? The router says the leases it is handing out are good for 180 minutes, and the delay-to-inaccessible was only about an hour. The DSL connection seems to have a 10 minute lease.

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• How can I make full-screen desktop applications only cover the snapped desktop?

  - by nhinkle

  In Windows 8, you can "snap" two apps next to each other, and one of those apps can be the legacy Windows desktop environment. A convenient application for this (or so I thought) would be to snap a chat client, small browser, or other app while watching content in full-screen on the desktop. The problem with this is that full screen desktop applications will take over the entire screen, even if the desktop is snapped to only occupy 3/4th of the display. What I would like is some way to force "full screen" desktop apps to only cover the snapped desktop area, and to truly go full screen if the desktop is snapped to full-width. Is there some way to configure this? If that didn't make sense, let me illustrate with pictures: Desktop in snapped view with SU chat in mini-browser: What happens when you click "full screen": What I want to happen when I click "full screen" (note this is digitally altered, not a real screenshot)

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• Windows Home Server Passwords Do Not Match

  - by Ben Fulton

  I have a Windows Home Server that chunks along just fine most of the time. I've never bothered to put it on a UPS and so it's vulnerable to power outages that happen a few times a year. This most recent time, it came back and seemed to be fine, but whenever I try to access a shared folder I get "Passwords do not match". They matched before the power went out, and I couldn't update the WHS password since I apparently didn't know the old one. How do I fix this? (I asked this on ServerFault and they recommended it be asked here instead)

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• Mikrotik queues and limiting total upstream bandwidth

  - by g18c

  With a Mikrotik router (form of embedded Linux) I have created simple queues per machine matched by source IP address. Each of the 4 machine queues has an unlimited burst 3Mbps/3Mbps for Tx/Rx. During speedtest.net on all 4 machines at the same time, each machine shows 3Mbps (and is limited correctly there), however the total bandwidth on the uplink goes to 12Mbps (i need to set this to 10Mbps max for the upstream). I want to restrict the actual traffic passing across the uplink port to 10Mbps regardless of what the other queues are doing (I need this catch all queue to have the final say on the uplink speed). For example I need: Scenario A Machine A transferring @ 3Mbps Machine B transferring @ 3Mbps Machine C transferring @ 3Mbps Machine D transferring @ 0Mbps Up-link speed = 9Mbps Scenario B Machine A trying to transfer @ 3Mbps Machine B trying to transfer @ 3Mbps Machine C trying to transfer @ 3Mbps Machine D trying to transfer @ 3Mbps Up-link speed = 10Mbps Actual transfer speed of machine A,B,C,D = 2.5Mbps This is to allow slight over subscription of bandwidth queues as not all will be transmitting at 3Mbps all the time. Is this possible and if so how would one go about doing this?

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• Using e-mail address as user name for SMTP and POP3

  - by PeterMmm

  I have a exim4 setup as SMTP. My user naming schema is to name all mail users for this server as m001, m002, m003, ... and then redirect to a real e-mail address with virtual domains. How can I allow my users to authenticate with exim to send mail using either their system user name (m001) or the email address ([email protected])? User login information for m001 are stored in linux system files (passwd, shadow). They are linked thru entries in a virtual address table for each domain that this server can serve: # /etc/exim4/virtual/example.com m001: [email protected] m002: [email protected] m003: [email protected] The same can be applied to qpopper ?

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• Best Guest OS for running freeswitch under Proxmox

  - by Frank Waller

  We have a lot of asterisk Systems running on dedicated machines and would like to use freeswitch to replace a number of them. One of the advantages of freeswitch is supposed to be that it is doing much better in a virtualized environment than asterisk is. However I can find very little information about people using it in Proxmox containers. I would like to know if anyone has seen any ready to run proxmox images that include freeswitch so we can test a number of things without having to deeply go into creating our own. Or at least a clue to which system images/distro images we can use to quickly get it installed not having to deal with too many dependency or different Linux version issues. Just to be clear: It should be for a more or less current Proxmox and current freeswitch. I am not looking forward to use the KVM mode but would consider it, if it is otherwise ready to run out of the box. I would rather use a real OpenVZ based container. Thanks for anyone helping!

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• What is the proper way to report a bug against the upgrade process from Ubuntu 9.10 to 10.4?

  - by Kim

  I just upgraded to lucid and discovered a nasty bug. It prevents the system from booting and took me hours to resolve. Now I'd like to report it along with the workaround I found. The only problem is: Where? Other such bugs have been filed against "update-manager", but that's just the GUI calling some scripts which do the real work. so what do I do? What should I substitute for XYZ in ubuntu-bug XYZ ?

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• Serving Compressed Files Amazon vs Lightty

  - by tike

  We are currently using amazon CloudFront to serve css and according to Amazon itself, Amazon CloudFront can serve both compressed and uncompressed files from an origin server. But while i check compression it shows everything fine in origin server but it shows notcompressed checking in the link with cloudfront. e.g. http://www.port80software.com/tools/compresscheck.asp?url=http%3A%2F%2Fimgsrv.mydomain.com%2Fen-UK%2Fsomething.css it would result with Compression status: (gzip) while with cloudfront http://www.port80software.com/tools/compresscheck.asp?url=http%3A%2F%2hereisit.cloudfront.net%2F%2Fsomething.css Compression status: Uncompressed Origin server is running lighttpd with mod_deflate however, allowed config is: deflate.allowed_encodings = ("bzip2", "gzip", "deflate") [i would think, putting extra allowed encoding wont affect as such.] Here i am clueless, what is the real issue.

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• Mass remove passwords from rar archives

  - by ldigas

  Is there a way to (I'm using WinRAR; demo, but I'm willing to change it to whatever is needed) mass remove passwords from a bunch of files ? Problem description: for reasons unknown to me, some archiving was done for two-and-something years in RAR format, and all archives have passwords. I have a list of them, them all being similar (mostly something like John-03, John-04, John-05 ... e.g. name-month ...) but I need to manipulate the files at large, and it is a real problem removing and or dearchiving all those files, while entering passwords manually. What would be my best options concerning ? Ideally, I'm looking for some kind of archiver which tries out a predefined list of passwords, and asks only if non of them cracks the safe. Afaik, WinRAR has no such feature.

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