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• How can I debug a port/connectivity issue?

  - by rfw21

  I am running a simple WebSocket server on Amazon EC2 (Fedora Core). I've opened the relevant port using ec2-authorize, and checked that it's opened. Iptables is definitely not running. However I can't connect to the port from outside EC2. I've tried the following (my server is running on port 7000): telnet ec2-public-dns.xx.xx.xx.amazon.com 7000 (from within EC2: connects fine) nmap localhost (output includes line: 7000/tcp open afs3-fileserver) telnet ec2-public-dns.xx.xx.xx.amazon.com 7000 (this time from my local machine: I get "connection refused: Unable to connect to remote host") The strange thing is this: if I start Nginx on port 7000 then it works and I can connect from outside EC2! And the WebSocket server fails on port 80, where Nginx works fine. To me this suggests a problem with the WebSocket server, BUT I can connect to it successfully from within EC2. (And it works fine on a different VPS account). How can I debug this further? If anybody can stop me tearing my hair out, I'd be very grateful indeed :)

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• Troubleshooting a Windows 7 PC that wouldn't sleep

  - by NPE

  I have a new Windows 7 PC that wouldn't sleep (not just automatically, but also when specifically told to). The screen goes black momentarily, but within two seconds the machine comes back as if nothing has happened. I tried powercfg energy. This produces some errors quoted at the bottom of this post, plus some warnings about timer resolution. There are no USB devices connected other than wireless keyboard + mouse (Logitech MK250); I tried unplugging them to no effect. The motherboard is Asus P7P55D-E. powercfg lastwake says "Wake History Count - 0", which I take to mean that it never actually went to sleep. I dual boot into Ubuntu, and was having exactly the same problem on the Linux side. That turned out to do with USB 3.0, which I've now disabled in the BIOS. This has solved the problem on the Ubuntu side of things, but made no difference to Windows 7. Any suggestions? Suspend:USB Device not Entering Suspend The USB device did not enter the Suspend state. Processor power management may be prevented if a USB device does not enter the Suspend state when not in use. Device Name Generic USB Hub Host Controller ID PCI\VEN_8086&DEV_3B34 Host Controller Location PCI bus 0, device 29, function 0 Device ID USB\VID_8087&PID_0020 Port Path 1 USB Suspend:USB Device not Entering Suspend The USB device did not enter the Suspend state. Processor power management may be prevented if a USB device does not enter the Suspend state when not in use. Device Name USB Root Hub Host Controller ID PCI\VEN_8086&DEV_3B34 Host Controller Location PCI bus 0, device 29, function 0 Device ID USB\VID_8086&PID_3B34 Port Path USB Suspend:USB Device not Entering Suspend The USB device did not enter the Suspend state. Processor power management may be prevented if a USB device does not enter the Suspend state when not in use. Device Name USB Composite Device Host Controller ID PCI\VEN_8086&DEV_3B34 Host Controller Location PCI bus 0, device 29, function 0 Device ID USB\VID_046D&PID_C52E Port Path 1,8

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• Orphan IBM JVM process

  - by Nicholas Key

  Hi people, I have this issue about orphan IBM JVM process being created in the process tree: For example: C:\Program Files\IBM\WebSphere\AppServer\bin>wsadmin -lang jython -f "C:\Hello.py" Hello.py has the simple implementation: import time i = 0 while (1): i = i + 1 print "Hello World " + str(i) time.sleep(3.0) My machine has such JVM information: C:\Program Files\WebSphere\java\bin>java -verbose:sizes -version -Xmca32K RAM class segment increment -Xmco128K ROM class segment increment -Xmns0K initial new space size -Xmnx0K maximum new space size -Xms4M initial memory size -Xmos4M initial old space size -Xmox1624995K maximum old space size -Xmx1624995K memory maximum -Xmr16K remembered set size -Xlp4K large page size available large page sizes: 4K 4M -Xmso256K operating system thread stack size -Xiss2K java thread stack initial size -Xssi16K java thread stack increment -Xss256K java thread stack maximum size java version "1.6.0" Java(TM) SE Runtime Environment (build pwi3260sr6ifix-20091015_01(SR6+152211+155930+156106)) IBM J9 VM (build 2.4, JRE 1.6.0 IBM J9 2.4 Windows Server 2003 x86-32 jvmwi3260sr6-20091001_43491 (JIT enabled, AOT enabled) J9VM - 20091001_043491 JIT - r9_20090902_1330ifx1 GC - 20090817_AA) JCL - 20091006_01 While the program is running, I tried to kill it and subsequently I found an orphan IBM JVM process in the process tree. Is there a way to fix this issue? Why is there an orphan process in the first place? Is there something wrong with my code? I really don't believe that my simplistic code is wrongly implemented. Any suggestions?

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• How to choose the most optimal RAID settings on PE2950

  - by javano

  I have some Dell PowerEdge 2950's with 4x 15k, 150GB Cheetah SAS drives in them. They are going to be VM hosts, CentOS running ESXi with Windows Server 2k8 guests. Some guests will be hosting IIS servers, and others MSSQL servers. I am trying to set the RAID virtual disks settings and can't decide which is more optimal given this situation; Read Policy: Out of Read-Ahead, No-Read-Ahead and Adaptive Read-Ahead, the default is Read-Ahead. I will be making large sequential writes initially, writing out blank images for virtual machine hard drives (lets say 30GBs from /dev/zero for example) so Read-Ahead seems good at first. But within the virtual machines reads could be random from anywhere within their file systems as they are IIS and MSSQL servers, so perhaps No-Read-Ahead is a better idea? Now I think Adaptive Read-Ahead would be better then as a compromise but I don't know much about this option, how does it compare in performance to the others? Write Policy: write-back caching, write-through caching, the default is write-back caching. The default of write-back caching is safer than write-through caching but at a performance expense. My thinking here is that in the event of power loss for example, it seems more likely in my head (this is why I need some clarification!) that damage will occur to a guest VM with write-back caching enabled, so I should favour write-through? I have searched around and there is obviously no definitive answer, so I would like to find out what is best for my situation.

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• Apache MaxClients doubt

  - by Milan Babuškov

  I have a busy Apache server serving only dynamic PHP+MySQL pages. It is a prefork Apache, version 2.2.4 with following config: KeepAlive off StartServers 8 MinSpareServers 32 MaxSpareServers 64 ServerLimit 512 MaxClients 512 MaxRequestsPerChild 4000 MaxClients/ServerLimit used to be set to 256, but I got the following error in error_log so I increased it: [error] server reached MaxClients setting, consider raising the MaxClients setting It seems to work now, but I have a doubt. Looking at MySQL log of queries, I have a couple hundred clients per seconds, but "ps ax" only shows 8, 9 or 10 processes running: [root@engine ~]# ps ax | grep http | wc -l 10 I even got this many processes when the above error message was shown in error_log. This made me investigate further. When I run netstat -a, I get something like this: tcp 0 0 engine:http adsl-105-143.teol.net:21453 TIME_WAIT tcp 0 0 engine:http 118-36.static.kds:mck-ivpip TIME_WAIT tcp 0 0 engine:http 118-36.static:oce-snmp-trap TIME_WAIT tcp 0 0 engine:http 118-36.static.kd:unifyadmin TIME_WAIT tcp 0 0 engine:http cable-188-2-25-29.dyna:4906 TIME_WAIT tcp 0 0 engine:http adsl-105-143.teol.net:21458 TIME_WAIT tcp 0 0 engine:http 109-92-83-91.dynamic.:62821 TIME_WAIT tcp 0 0 engine:http cable-89-216-142-192.:63576 TIME_WAIT tcp 0 0 engine:http 109-92-83-91.dynamic.:62819 TIME_WAIT tcp 1081 0 engine:http pttnetadsl38-36.ptt.r:50496 ESTABLISHED tcp 0 0 engine:http cable-188-2-36-196.dyn:4136 TIME_WAIT tcp 0 0 engine:http cable-89-216-142-192.:63580 TIME_WAIT tcp 0 0 engine:http cable-89-216-142-192.:63581 TIME_WAIT etc. When counting those, I get: [root@engine ~]# netstat -a | grep http | wc -l 431 Can anyone tell me what is really going on here and how to make sure my server keeps working, because I only use 50% of available RAM in machine?

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• Is there the equivalent of cloud computing for modems?

  - by morpheous

  I asked this question on SF, and someone recommended that I ask it here - (I don't think I have enough points to move a question from SF to SO - and in any case, I don't know how to do it - so here is the question again): I am interested in the concept of PAAS (platform as a service). However, all talk about SAAS/PAAS seems to focus on only the computer itself - not its peripherals. Is it possible to 'outsource' modems as a resource - so that an app running remotely can pump data to a modem in the cloud? As a bit of background to the question, a group of us are thinking of starting a company that offers similar services to companies like twilio etc - but I want to 'outsource' both the computing hardware (thats PAAS - the easy bit) and the modems (thats what I cant seem to find any info on). Does anyone know if modems can be bundled as part of a PAAS service? - alternatively, is there a way that an application running on one computer can communicate (i.e. pump data) to a remote modem residing on another machine?. I assume I can come up with some protocol over UDP or TCP - but there is no point reinventing the wheel - if such a protocol like that already exists (or if it some open source software allows one to do this). Any suggestions on how to solve this problem?

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• What does "cpuid level" means ? Asking just for curiosity

  - by ogzylz

  For example, I put just 2 core info of a 16 core machine. What does "cpuid level : 6" line means? If u can provide info about lines "bogomips : 5992.10" and "clflush size : 64" I will be appreciated ------------- processor : 0 vendor_id : GenuineIntel cpu family : 15 model : 6 model name : Intel(R) Xeon(TM) CPU 3.00GHz stepping : 8 cpu MHz : 2992.689 cache size : 4096 KB physical id : 0 siblings : 4 core id : 0 cpu cores : 2 fpu : yes fpu_exception : yes cpuid level : 6 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm constant_tsc pni monitor ds_cpl vmx cid cx16 xtpr lahf_lm bogomips : 5992.10 clflush size : 64 cache_alignment : 128 address sizes : 40 bits physical, 48 bits virtual power management: processor : 1 vendor_id : GenuineIntel cpu family : 15 model : 6 model name : Intel(R) Xeon(TM) CPU 3.00GHz stepping : 8 cpu MHz : 2992.689 cache size : 4096 KB physical id : 1 siblings : 4 core id : 0 cpu cores : 2 fpu : yes fpu_exception : yes cpuid level : 6 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm constant_tsc pni monitor ds_cpl vmx cid cx16 xtpr lahf_lm bogomips : 5985.23 clflush size : 64 cache_alignment : 128 address sizes : 40 bits physical, 48 bits virtual power management:

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• Accessing Virtual Host from outside LAN

  - by Ray

  I'm setting up a web development platform that makes things as easy as possible to write and test all code on my local machine, and sync this with my web server. I setup several virtual hosts so that I can access my projects by typing in "project" instead of "localhost/project" as the URL. I also want to set this up so that I can access my projects from any network. I signed up for a DYNDNS URL that points to my computer's IP address. This worked great from anywhere before I setup the virtual hosts. Now when I try to access my projects by typing in my DYNDNS URL, I get the 403 Forbidden Error message, "You don't have permission to access / on this server." To setup my virtual hosts, I edited two files - hosts in the system32/drivers/etc folder, and httpd-vhosts.conf in the Apache folder of my WAMP installation. In the hosts file, I simply added the server name to associate with 127.0.0.1. I added the following to the http-vhosts.conf file: <VirtualHost *:80> ServerAdmin webmaster@localhost DocumentRoot "c:/wamp/www/ladybug" ServerName ladybug ErrorLog "logs/your_own-error.log" CustomLog "logs/your_own-access.log" common </VirtualHost> <VirtualHost *:80> ServerAdmin webmaster@localhost DocumentRoot "c:/wamp/www" ServerName localhost ErrorLog "logs/localhost-error.log" CustomLog "logs/localhost-access.log" common </VirtualHost> Any idea why I can't access my projects from typing in my DYNDNS URL? Also, is it possible to setup virtual hosts so that when I type in http://projects from a random computer outside of my network, I access url.dyndns.info/projects (a.k.a. my WAMP projects on my home computer)? Help is much appreciated, thanks!

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• Windows Server task manager displays much higher memory use than sum of all processes' working set s

  - by Sleepless

  I have a 16 GB Windows Server 2008 x64 machine mostly running SQL Server 2008. The free memory as seen in Task Manager is very low (128 MB at the moment), i.e. about 15.7 GB are used. So far, so good. Now when I try to narrow down the process(es) using the most memory I get confused: None of the processes have more than 200MB Working Set Size as displayed in the 'Processes' tab of Task Manager. Well, maybe the Working Set Size isn't the relevant counter? To figure that out I used a PowerShell command [1] to sum up each individual property of the process object in sort of a brute force approach - surely one of them must add up to the 15.7 GB, right? Turns out none of them does, with the closest being VirtualMemorySize (around 12.7 GB) and PeakVirtualMemorySize (around 14.7 GB). WTF? To put it another way: Which of the numerous memory related process information is the "correct" one, i.e. counts towards the server's physical memory as displayed in the Task Manager's 'Performance' tab? Thank you all! [1] $erroractionpreference="silentlycontinue"; get-process | gm | where-object {$.membertype -eq "Property"} | foreach-object {$.name; (get-process | measure-object -sum $_.name ).sum / 1MB}

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• Adding gcc 4.9 as a compiler option in Xcode

  - by user2129150

  I asked this question on StackOverflow, but it's pretty much stagnant. Sorry if this is considered a repost/double-post. I just installed gcc 4.9 (with C11 support), and want to add it to Xcode 4.6.3's build options as a compiler option. I ran make and make install, and the packages are all there (under /usr/bin/gcc. Running gcc --version confirms that gcc 4.9 is installed rather than an older version. When I go into an existing Xcode project's build settings, the only compiler options available are Apple LLVM compiler 4.2 LLVM GCC 4.2 Other... Clearly, GCC 4.9 would have to be added using the "Other..." option, although I'm not sure how. I've tried inputting the path to gcc (/usr/bin/gcc), although the default value for other isn't a path at all: com.apple.compilers.llvmgcc42. I've also tried following the instructions from the answer to this question as well, but the machine I'm on doesn't have the /Developer directory at all, since I believe Apple integrated the developer tools that required (and created) this directory into Xcode. How do I add gcc 4.9 as a compiler option in Xcode?

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• Installing xampp on system that already have mysql

  - by Charith

  I'm rather new to PHP and xampp. I have a computer that has installed MySQL server and MySQL workbench as I was working with Java and NetBeans. Now I want to use my computer for developing PHP and other web stuff too. I installed xampp successfully. But when I'm trying to access phpMyAdmin, it gives me an error saying mysql server rejected its connection Actually I tried stopping my current MySQL service and installing it again. However xampp have a its own mysql server in its installation path too. I tried configuring config.inc.php to use my existing installation of MySQL which is on a separate path. But I failed. Can anyone please instruct me how to configure this xampp to use my existing MySQL server to do everything and ignore the installed one with itself? I don't want two MySQL services to run on my system and clash in future. I'll be glad if anyone can explain to me what is best to use when you're developing Java, PHP, C and all the stuff on the same machine. P.S.: I have been given a password for my existing MySQL sever (user = root) as we do it usually when installing MySQL alone.

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• Transparent proxying in MacOS X 10.6 Snow Leopard (and maybe FreeBSD)

  - by apenwarr

  I'm trying to create a transparent proxy on my MacOS machine in order to port the sshuttle ssh-based transproxy VPN from Linux. I think I almost have it working, but sadly, almost is not 100%. Short version is this. In one window, start something that listens on port 12300: $ while :; do nc -l 12300; done Now enable proxying: # sysctl -w net.inet.ip.forwarding=1 # sysctl -w net.inet.ip.fw.enable=1 # ipfw add 1000 fwd 127.0.0.1,12300 log tcp from any to any And now test it out: $ telnet localhost 9999 # any port number will do # this works; type stuff and you'll see it in the nc window $ telnet google.com 80 # any host/port will do # this *doesn't* work! After the latter experiment, I see lines like this in netstat: $ netstat -tn | grep ^tcp4 tcp4 0 0 66.249.91.104.80 192.168.1.130.61072 SYN_RCVD tcp4 0 0 192.168.1.130.61072 66.249.91.104.80 SYN_SENT The second socket belongs to my telnet program; the first is more suspicious. SYN_RCVD implies that my SYN packet was correctly captured by the firewall and taken in by the kernel, but apparently the SYNACK was never sent back to telnet, because it's still in SYN_SENT. On the other hand, if I kill the nc server, I get this: $ telnet google.com 80 Trying 66.249.81.104... telnet: connect to address 66.249.81.104: Connection refused telnet: Unable to connect to remote host ...which is as expected: my proxy server isn't running, so ipfw redirects my connection to port 12300, which has nobody listening on it, ie. connection refused. My uname says this: $ uname -a Darwin mean.local 10.2.0 Darwin Kernel Version 10.2.0: Tue Nov 3 10:37:10 PST 2009; root:xnu-1486.2.11~1/RELEASE_I386 i386 Does anybody see any different results? (I'm especially interested in Snow Leopard vs Leopard results, as there seem to be some internet rumours that transproxy is broken in Snow Leopard version) Any advice for how to fix?

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• Assistance on setup to Connect an offsite server to the LAN via RRAS VPN - Server 2008 R2

  - by Paul D'Ambra

  I have an office LAN protected using a Zyxel Zywall USG 300. I've set up an L2TP/ipsec VPN on that which accepts connections using a shared secret and I've tested this from multiple clients. I have a server offsite and want to set up RRAS to use a persistent connection to the VPN so that it can carry out network jobs even with no one logged in (I'm using it for Micorosft DPM secondary backup). If I create a vpn as if I were setting up a users laptop it can dial in no problem but if I set up a demand dial interface in RRAS it errors. I enable RRAS ticking only demand dial interface (branch office routing) Select network interfaces, right click and choose new demand dial interface Name the VPN ToCompany Select connect using VPN And then L2TP as the vpn type enter the IP address (double-checked for typos!) select Route IP packets on this interface specify static route to remote network as 10.0.0.0/24 with metric of 1 add dial out credentials (again double checked for typos and confirmed with other vpn connections click finish now I right-click on the new interface and choose properties and then the security tab I change Data encryption to optional select only PAP for Authentication (both as per manufacturer of Zywall) click advanced settings against type of vpn and set shared secret then I select the new interface, right-click and choose connect this dials and then errors with either 720 or 811 as the error codes. However, if I create a VPN by going to Network & Sharing center and setting up as if I was creating a VPN from my laptop to the office (say) it dials successfully so I know the VPN settings are correct and the machine can connect to the VPN. Suggests very strongly the problem is how I'm setting up RRAS. Can anyone help?

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• BackupExec 12 + RALUS - VERY slow backups

  - by LVDave

  We use Backup Exec 12 and the Remote Agent for Linux/Unix Servers (RALUS) to backup a large RHEL5 system. For various reasons we need to do a daily working set job. These working-set jobs run abysmally slow. The link between the target machine and the BE server is gigabit, and any other type of job runs 1-3GB/min. These working-set jobs start out at perhaps 40MB/min and over the course of the backup job slowly drops down so low that the BE job rate display in the "current jobs" goes blank.. Since we usually are only doing changed-files for one day, the job is usually small and finishes overnight and we don't worry abotu the slowness, but we had some issues with the backup server, and missed about 6 days of fairly heavy work on the Linux box, so this working-set job will be a doozy.. We have support with Symantec, and I've pestered them a lot about this, they've had me run RALUS in debug mode, sent them that log and a VXgather from the BE host and they had no fix/workaround.. To give an idea, I have the mentioned working-set job running for the last 3 1/2 hours and it's backed up just under 10MEGAbytes.... I'm posting this here to see if anybody in the "real world" has seen this/and/or has any ideas what might be causing these abysmally slow jobs, since Symantec seems to be clueless...

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• Can not access SQLServer database

  - by btrey

  I'm trying to convert an Access database to use a SQLServer backend. I've upsized the database and everything works on the server, but I'm unable to access it remotely. I'm running SQLServer Express 2005 on Windows Server 2003. The server is not configured as a domain controller, nor connected to a domain. The computers I'm trying to access the server from are part of a domain, but there are no local domain controllers. I'm at a remote location and the computers are configured and connected to the domain at the home office, then shipped to us. We normally log in with cached credentials and VPN into the home office when we need to access the domain. I can use Remote Desktop Connection to access the 2k3 server which is running SQLServer. If I log into the server with my username, I can bring up the database, access it via the Trusted Connection, and the database works. If I try to run the database locally, however, I get the Server Login dialog box. I can not use a Trusted Connection because my local login is to the home office domain and is not recognized by the SQLServer machine. If I try to use the username/password that is local to the SQLServer, I get a login failed error. I've tried entering the username as "username", "workgroup/username" (where "workgroup" is the name of the workgroup on the SQLServer), "sqlservername/username" and "[email protected]" where "1.2.3.4" is the IP of the SQLServer. In all cases, I get a login failed error. As I said, I can login to the server via Remote Desktop Connection with the same username and password and use the database, so permissions for the username appear to be correct for both a remote connection and for database access. Not sure where to go from here and any assistance would be appreciated.

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• Test server on a local network with XAMPP

  - by hopscotch1978

  Hi, I'm not very proficient with networks and could use some help. I've got a Win 7 desktop with XAMPP which acts as my local dev machine. I've configured a virtual host on the desktop which I'm able to access fine. If I'm understanding things correctly, the virtual host uses port 80 (<VirtualHost 127.0.0.1:80>). I've just tried to configure a separate Win XP laptop on the local wireless network to connect to the main desktop for testing purposes. I've added the IP address and virtual host name to my Hosts file on the laptop. My virtual host is imaginatively named "virtualhost1". When I type this into my laptop browser, it connects correctly to the main desktop and I get the XAMPP welcome screen. But I can't seem to get to the actual site, just the XAMPP welcome screen. It kind of jumps the browser to http://virtualhost1/xampp/. I think it's a port issue of some sort but I have no idea how to resolve it. I would get the same XAMPP welcome screen on my desktop if I omitted ":80" from the virtual host declaration. On my main desktop, typing "virtualhost1" to the browser address bar gives me the site correctly, not the XAMPP welcome screen. Help would be appreciated. Thank you.

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• computer build for extreme tabbed browsing

  - by David Berger

  I'm interested in building or buying a task-specific computer for my brother. His requirements are ridiculously simple: the machine has to be able to wait in hundreds of web-based virtual waiting rooms at once and not crash. To be competitive, he needs to be able to enter the waiting rooms an dauto-refresh them faster. My question is, what priority do I give the different specs? My initial surmise is this: Connection speed (nothing to do with my build, but I kind of think this will be more beneficial than anything I build for him) Memory size -- I don't usually see firefox taking up more than a gig, even when heavily tabbed, but I think one gig for the operating system and two gigs for the browser are necessary. Processor speed -- I think the processor will affect performance, but even something out of date will do what he needs Memory speed/RAM bus -- I doubt this will matter much, but it seems just on this side of irrelevant. Everything else is a non-issue for him. Does this seem to stack up correctly? Also, since he's looking to stay on the cheaper side, and I might end up recommending a refurb to him, is there anything particularly egregious that Vista would do if it came pre-installed? If I build it myself, I'll give him linux, but if I have it shipped to him, I'm not sure I could walk him through the install process for linux, but I probably could walk him through the process to upgrade to Windows 7, if it were somehow worth it.

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• Connecting jconsole using SOCKS to Amazon EC2

  - by freshfunk

  I'm trying to use jconsole to view stats on an EC2 instance by using a socks proxy created by SSH. I've tried the various scripts mentioned in the links below but to no avail: http://simplygenius.com/2010/08/jconsole-via-socks-ssh-tunnel.html http://gabrielcain.com/blog/2010/11/02/using-ssh-proxying-to-connect-jconsole-to-remote-cassandra-instances/ I'm running ssh -f -ND 8123 myuser@mymachine and verified that at least Firefox goes through it as a proxy. I then run jconsole -J-DsocksProxyHost=localhost -J-DsocksProxyPort=8123 service:jmx:rmi:///jndi/rmi://ec2-XX-XX-XXX-XXX.compute-1.amazonaws.com:8080/jmxrmi I run netstat -n on my EC2 instance and I see a connection created by my machine. However, the connection eventually disappears and I get a 'channel 2: open failed: connect failed: Operation timed out' from my ssh tunnel. I've opened the jmx port through the security group and I've checked the port on the EC2 instance to make sure it's open (by telnet-ing to it). I'm not sure where to look next. Are there some properties in sshd_config or ssh_config I need to enable for tunneling? Or anything in Mac OS X? I feel like a serious noob but sys administration is really not my strong point. I've spent several hours and can't get this to work.

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• Can I recover a rm -rf-ed Mercurial repository?

  - by WishCow

  I made the mistake of wiping out my entire project directory with a quick "rm -rf project". Of course, the .hg directory went with it. I had about 15-20 changesets, that I have not pushed to anyone, and I would really really like to get those back. The system is a Ubuntu machine, and the partiton where the delete happened is ext3, the project consist mostly of PHP files. I know about the guideline to not write to the disk in question. The first idea was to use the tool named scalpel, to get the PHP files back and diff them with the current version from the repo, and somehow carve the changes out. While it succeeded, it did not recover the file names (or there is a switch I'm missing), so I'm left with a few thousand sequentially named .php files, combing through them is not an option. Can a kind soul please save me, and suggest a way to: a) get the repo back, or b) get the files back, with filenames For those wondering how I did such a stupid thing: I was working on a file in Vim which I wanted to remove from the repository: :!hg rm % This complained that the file is in a subrepository, so I specified the following: :!hg rm % -R engine which complained that file has modifications, use -f to force. And this is when somehow, I made up the following command: :!rm -rf % -R engine Somehow, seeing "force" makes me do a rm -rf by reflex.

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• Ubuntu 64bit Xen DomU Issues after upgrade from Karmic to Lucid

  - by Shoaibi

  I was upgrading my servers today and it all went fine except the last machine which has the following issues: [Resolved using http://www.ndchost.com/wiki/server-administration/upgrade-ubuntu-pre-10.04#post-1004-upgradefinal-steps] No login prompt on console Done. Begin: Mounting root file system... ... Begin: Running /scripts/local-top ... Done. [ 0.545705] blkfront: xvda: barriers enabled [ 0.546949] xvda: xvda1 [ 0.549961] blkfront: xvde: barriers enabled [ 0.550619] xvde: xvde1 xvde2 Begin: Running /scripts/local-premount ... Done. [ 0.870385] kjournald starting. Commit interval 5 seconds [ 0.870449] EXT3-fs: mounted filesystem with ordered data mode. Begin: Running /scripts/local-bottom ... Done. Done. Begin: Running /scripts/init-bottom ... Done. Also tried by pressing ENTER and CTRL+C many times, no use. Resolved: [/tmp was mounted as noexec, changing that fix it]: I get errors when i try to re-install udev in single user mode: Unpacking replacement udev ... Processing triggers for ureadahead ... ureadahead will be reprofiled on next reboot Processing triggers for man-db ... Setting up udev (151-12.1) ... udev start/running, process 1003 Removing `local diversion of /sbin/udevadm to /sbin/udevadm.upgrade' update-initramfs: deferring update (trigger activated) Processing triggers for initramfs-tools ... update-initramfs: Generating /boot/initrd.img-2.6.32-25-server /usr/sbin/mkinitramfs: 329: /tmp/mkinitramfs_yuuTSc/scripts/local-premount/fixrtc: Permission denied /usr/sbin/mkinitramfs: 329: /tmp/mkinitramfs_yuuTSc/scripts/local-premount/ntfs_3g: Permission denied /usr/sbin/mkinitramfs: 329: /tmp/mkinitramfs_yuuTSc/scripts/local-premount/resume: Permission denied /usr/sbin/mkinitramfs: 329: /tmp/mkinitramfs_yuuTSc/scripts/nfs-top/udev: Permission denied /usr/sbin/mkinitramfs: 329: /tmp/mkinitramfs_yuuTSc/scripts/panic/console_setup: Permission denied /usr/sbin/mkinitramfs: 329: /tmp/mkinitramfs_yuuTSc/scripts/init-top/all_generic_ide: Permission denied /usr/sbin/mkinitramfs: 329: /tmp/mkinitramfs_yuuTSc/scripts/init-top/blacklist: Permission denied /usr/sbin/mkinitramfs: 329: /tmp/mkinitramfs_yuuTSc/scripts/init-top/udev: Permission denied /usr/sbin/mkinitramfs: 329: /tmp/mkinitramfs_yuuTSc/scripts/init-bottom/udev: Permission denied /usr/sbin/mkinitramfs: 329: /tmp/mkinitramfs_yuuTSc/scripts/local-bottom/ntfs_3g: Permission denied

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• Best way to integrate applications to windows 7 install.wim image

  - by cyph3r

  I have right now an unmodified .iso of a windows 7 32bit and 64bit installation disk. And I need to integrate to that some applications (office, adobe reader etc) and windows updates so that when windows are installed the above applications/updates are already installed and working. Requirements: My output has to be a install.wim image containing the new/improved windows installation files because the deployment is done via a pxe server and a custom windowsPE enviroment. The procedure to create the install.wim has to be as automatic as possible. I can't create it manually every time I want to incorporate a new windows or application update to the image. The image will be installed on 100+ computers so it needs to be 'generic'. I've never done something like this before but from what I searched a possible solution to this issue would be: To create a reference installation (preferably on a vm so I can take snapshots) complete with its applications/updates/settings. After the complete setup I take a snapshot of the installation Run C:\Windows\System32\sysprep\sysprep.exe /oobe /generalize /shutdown to sysprep the machine. Boot to a WindowsPE enviroment and capture the .wim image using gimagex. Deploy the .wim and enjoy the rapid installation times. :D Does that sound ok? Would you recommend anything else? Right now the applications are installed after the installation of windows is complete. So the total installation time is quite long. That's why I need a different approach.

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• Why would one of my servers stop being able to access other servers by FQDN?

  - by Newlyn Erratt

  I have a number of servers on our local network and our debian server has suddenly stopped being able to access the other servers via their FQDN. Initial symptom was inability to login with Active Directory accounts. On further inspection, this machine, porkbelly, was unable to access our other servers (e.g. bacon and albert) via their FQDN. That is, they can ping albert by running ping albert but not by running ping albert.domain.local though when running ping albert it will be expanded to albert.domain.local. The server is still accessible from other servers via both porkbelly and porkbelly.domain.local. Upon examination of hosts information and running hostname its hostname and FQDN are correct. The resolv.conf appears correct. It contains: domain domain.local search domain.local nameserver 192.168.0.xxx (the nameserver) The dns server is also our Windows AD server. I'm not even sure where to go from here or why dns seems to be partially working though I don't have much experience. Where should I go from here? What might be causing this issue where machines are visible via their hostname but not their FQDN?

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• Intermittent NFS lockups on Isilon cluster

  - by blackbox222

  We have an Isilon cluster with 8 IQ 12000x nodes which exports storage via several NFS shares for a handful of Linux and Solaris clients. There is a Linux system that has one of these NFS filesystems mounted. I/O to this filesystem is moderately heavy from the Linux system. Every 3-4 weeks (it's not on any kind of discernible schedule, and sometimes is more/less frequent than this), we notice that all activity ceases on this NFS mount (the process hangs, as if the network stopped working so process is stuck in uninterruptible sleep) - 30 minutes later, the share recovers and things continue to work normally. The kernel log from the affected machine is as follows: Dec 3 10:07:29 redacted kernel: [8710020.871993] nfs: server nfs-redacted not responding, still trying Dec 3 10:37:17 redacted kernel: [8711805.966130] nfs: server nfs-redacted OK relevant /etc/fstab line: nfs-redacted:/ifs/nfs/export_data/shared/...redacted... /data nfs defaults 0 0 I've checked to see if there are any scheduled processes e.g. cron jobs, Isilon related functions e.g. snapshots, etc that might be causing these hangups but I can't seem to find anything. I'm also not aware of any network related issues or maintenance that would cause this. All of the lockups last almost exactly 30 minutes per the kernel logs. Perhaps someone has some suggestions I could try? (I considered a soft mount to avoid the problems associated with processes accessing the filesystem hanging; however am wary of the corruption that could result and it would not really solve the underlying issue anyway).

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• how would it be possible to discover a cable modem's MAC remotely?

  - by amateurenthusiast

  i was reading the back archives of a canadian privacy law blog, and he linked to a judicial decision. apparently as part of an investigation in which were used yahoo chat and google's old 'hello' image trading program the officer was able to determine a suspect's modem's MAC address: In order to determine who STEPHTOSH was, the officer did a trace on a programme called WHO IS in an effort to learn from where STEPHTOSH was coming. WHO IS is a command program available to the public. The officer was able to ascertain that the person using the name STEPHTOSH was a Rogers Internet customer. The officer was able to obtain the Internet Protocol address, also known as the I.P. There is only one location for an I.P., which is unique to that subscriber. By use of the website known as DNS STUFF.com, one is able to find with which company this I.P. is registered. It was ascertained that the I.P. address used by STEPHTOSH was registered to Rogers Cable, from the Toronto area. The officer also learned the Cable Modem MAC address used by STEPHTOSH. This was all the information the officer was able to amass. now it was my understanding that the MAC address of any given device can only be accessed if you're only one 'hop' away on the Internet. the suspect in question was in Markham and the officer part of the Toronto Police, so it's conceivable that they both might have used Rogers internet. but would that still put them only one 'hop' away from each other? i thought the first hop after the modem was usually the ISP? and if he'd used a netBIOS query against this guy's machine it would return the ethernet card's MAC, not the modem's. so is this guy on the same rogers subnet as the suspect's cable modem, is that functionality part of google's Hello (i could only think that it would be possible if Hello operated as a virtual LAN or something), does the officer have remote access to the arp caches of the routers at Rogers or is he just full of crap and lying to make his case stronger?

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• iperf max udp multicast performance peaking at 10Mbit/s?

  - by Tom Frey

  I'm trying to test UDP multicast throughput via iperf but it seems like it's not sending more than 10Mbit/s from my dev machine: C:\> iperf -c 224.0.166.111 -u -T 1 -t 100 -i 1 -b 1000000000 ------------------------------------------------------------ Client connecting to 224.0.166.111, UDP port 5001 Sending 1470 byte datagrams Setting multicast TTL to 1 UDP buffer size: 8.00 KByte (default) ------------------------------------------------------------ [156] local 192.168.1.99 port 49693 connected with 224.0.166.111 port 5001 [ ID] Interval Transfer Bandwidth [156] 0.0- 1.0 sec 1.22 MBytes 10.2 Mbits/sec [156] 1.0- 2.0 sec 1.14 MBytes 9.57 Mbits/sec [156] 2.0- 3.0 sec 1.14 MBytes 9.55 Mbits/sec [156] 3.0- 4.0 sec 1.14 MBytes 9.56 Mbits/sec [156] 4.0- 5.0 sec 1.14 MBytes 9.56 Mbits/sec [156] 5.0- 6.0 sec 1.15 MBytes 9.62 Mbits/sec [156] 6.0- 7.0 sec 1.14 MBytes 9.53 Mbits/sec When I run it on another server, I'm getting ~80Mbit/s which is quite a bit better but still not anywhere near the 1Gbps limits that I should be getting? C:\> iperf -c 224.0.166.111 -u -T 1 -t 100 -i 1 -b 1000000000 ------------------------------------------------------------ Client connecting to 224.0.166.111, UDP port 5001 Sending 1470 byte datagrams Setting multicast TTL to 1 UDP buffer size: 8.00 KByte (default) ------------------------------------------------------------ [180] local 10.0.101.102 port 51559 connected with 224.0.166.111 port 5001 [ ID] Interval Transfer Bandwidth [180] 0.0- 1.0 sec 8.60 MBytes 72.1 Mbits/sec [180] 1.0- 2.0 sec 8.73 MBytes 73.2 Mbits/sec [180] 2.0- 3.0 sec 8.76 MBytes 73.5 Mbits/sec [180] 3.0- 4.0 sec 9.58 MBytes 80.3 Mbits/sec [180] 4.0- 5.0 sec 9.95 MBytes 83.4 Mbits/sec [180] 5.0- 6.0 sec 10.5 MBytes 87.9 Mbits/sec [180] 6.0- 7.0 sec 10.9 MBytes 91.1 Mbits/sec [180] 7.0- 8.0 sec 11.2 MBytes 94.0 Mbits/sec Anybody has any idea why this is not achieving close to link limits (1Gbps)? Thanks, Tom

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