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• MongoDB on 128mb 32-bit VPS (plus Tornado and Redis)

  - by apito

  i am curious about how mongodb will perform in a limited vps. specifically, i'll deploy this configuration on 32-bit ubuntu 9.04 server with 128Mb memory (UPDATE: now i'm considering 360mb too). nginx and redis three instances of tornado apps (one is for mobile site; limited app, not my primary audience); has around 8 Collections. social webapp for my community. mongodb all beside mongodb seems to have small footprint. memory-mapping-wise, i dont know how mongodb will behave. i know it's a little bit a stretch to use this kind of config on a tiny vps, but that's what i can afford for now. i expect to have.. hmm.. maybe ~50 15rps. i did my homework doing a lot of frontend optimizations and yslow says grade A 91 (ruleset V2) :-) anyone willing to share experiences? eg. how big the data set size when mongo hit the ceiling, performance when mongo do a lot of disk IO, etc. thanks. UPDATE: this is my pet project. i'll get back to you when i have next spare time to do same httperf in a vbox with exact spec. suggestion how to do stress testing welcomed. i'm new to this kind of stuff.

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• Dell laptop keyboard doesn't work

  - by Tam

  I'm trying to fix my in-laws laptop, it's a Dell Studio 1745 that's running Windows 7 64 bit. The problem is that most of the keys on the keyboard do not work. The function keys work and the caps lock and numpad keys work, but no other keys do. If I hit the F2 key enough times when starting up, I can get to the BIOS, but after that even the function keys stop working. If I let it go all the way to the Windows login screen, I can see that the caps lock and num lock work - little images on screen actually appear, but they don't toggle the state of the key, i.e.,capslock is always off, numlock is always off. Using the fn+function combo works, so changing the brightness, etc. works fine. I'm stumped. I've tried disconnecting power and battery and leaving it for an hour or so before starting up but that hasn't helped either. Also - this might be a red herring - the touchpad is failing as well, the MS Device Manager says that it's failing with status 10, "unable to start device"

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• "What happens?" server performance monitor

  - by AlexAtNet

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

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• Host system resets (crashes) when using VMWare or VirtualBox and 64-bit guest systems

  - by sinni800

  I have been trying to install virtual systems on VMWare for a while now and encountered strange behaviour from my PC. The behaviour is as follows: On "automatic" virtualization mode it either outputs a cryptic error message (can MAYBE give later, if I can reproduce) right on startup (before even the BIOS) or it resets the complete HOST system (blackscreen, bios...) If I install a Windows XP on it it works well on "binary translation" mode. If I try installing Linux on it, in "binary translation" mode it crashes 1 or 2 seconds after I hit enter on the GRUB selection screen (after the first page of kernel messages rolled in) Using VirtualBox it crashes right in the BIOS. It gave me a Bluescreen though! 0x00000101: CLOCK_WATCHDOG_TIMEOUT: a clock interrupt was not received on a secondary processor within the allocated time interval NEWS: I tried VirtualBox again and it did not completely crash the computer this time. It gave me a critical error and a log file: http://pastebin.com/yKZSDs91 In conclusion, it will crash instantly if VT-x is activated. If not, it seemingly only crashed if I try to install something with 64 bits. Another update: Yes, it ONLY crashes when the guest is 64 bit! What I tried: Reinstalling Windows (my Windows installation was quite broken so it seemed natural. Didn't work though.) New BIOS What I am certain of: Virtualization extensions are activated in the BIOS What my computer specs are: ASUS P8P67 LE mainboard, newest BIOS/EFI firmware Intel Core i5 2500k Ati Radeon HD 5770 16 GB Corsair 1333mhz DDR3 RAM, 4 X 4 GB

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• Windows XP cannot read DVD burned on Ubuntu

  - by webcrawl

  The story : I have burned a DVD disc on Ubuntu using Brasero. When file burning was complete, I canceled the burning of checksum to DVD. Then I put that DVD on Windows XP (SP3) and copied all the files from DVD to the hard drive (no errors when copying). When that was done I discovered that all copied files are not readable. What is more, all the files on that DVD also shown to be not readable, even though all file names, directories were in their place. What I found out? Windows detect that the disc is in CDFS (CD-ROM File System). Disc is clean as new, have no scratches. All files while opened in Notepad++ look like "NULNULNULNULNUL" in one line. The size of files is normal. Other discs that are recognized as CDFS can be read with no problems. What I tried? Starting CDFS service in Windows registry. Result - a new device in Windows Device Manager (JUBS JGH2ZCT SCSI CdRom Device). Removing my CD/DVD device from Device Manager. Result - Windows restarted the system and reinstalled the driver. So... how to read the DVD, when I have no access to any other PC, any other OS?

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• How to tell nginx to honor backend's cache?

  - by ChocoDeveloper

  I'm using php-fpm with nginx as http server (I don't know much about reverse proxies, I just installed it and didn't touch anything), without Apache nor Varnish. I need nginx to understand and honor the http headers I send. I tried with this config (taken from the docs) but didn't work: /etc/nginx/nginx.conf: fastcgi_cache_path /var/lib/nginx/cache levels=1:2 keys_zone=website:10m inactive=10m; fastcgi_cache_key "$scheme$request_method$host$request_uri"; /etc/nginx/sites-available/website: server { fastcgi_cache website; #fastcgi_cache_valid 200 302 1h; #fastcgi_cache_valid 301 1d; #fastcgi_cache_valid any 1m; #fastcgi_cache_min_uses 1; #fastcgi_cache_use_stale error timeout invalid_header http_503; add_header X-Cache $upstream_cache_status; } I always get "MISS" and the cache dir is empty. If I uncomment the other directives, I get hit, but I don't want those "dumb" settings, I need to control them within my backend. For example, if my backend says "public, s-maxage=10", the cache should be considered stale after 10 secs. Instead, nginx will store it for 1h, because of these directives. I was thinking whether I should try proxy_cache, not sure what's the difference. In both fastcgi and proxy modules docs it says this: The cache honors backend's Cache-Control, Expires, and etc. since version 0.7.48, Cache-Control: private and no-store only since 0.7.66, though. Vary handling is not implemented. nginx version: nginx/1.1.19 Any thoughts? pd: I also have the reverse proxy that is offered by Symfony2 (which I turn off to use nginx's). The headers are interpreted correctly by it, so I think I'm doing it right.

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• How to verify system using right GPU, after system reset [duplicate]

  - by Antoros

  This question already has an answer here: Is my mobile AMD card being used? 2 answers OS: Windows 8 CPU: Intel® Core™ i7 Processor 3635QM GPU 1 : Intel HD Graphics 4000 GPU 2 : AMD Radeon™ HD 8870M other info: System Spects Problem: im unsure that CCC is using AMD card instead of Intel's, i have encountered several issues since updating to 8.1 and i don't know what to do What happened: Installed 8.1 patch first day After 1 minute of use, BBSOD, windows never loaded again System restore wouldnt recognize 8.0 restore points i did a system reset to windows 8 since the laptop was only 3 weeks old System Broke, it did restore to factory BUT kept the registry almost intact, i had to install almost everything again, since the factory drivers where working with the updated one's registry and several problems CCC Broke too <- What i've already done Installing new drivers on top of old ones didnt work, so i used AMD uninstaller first Uninstalled and Re-installed Intel's HD Graphics Driver Tried to install mobile center, but AMD told me that it wasnt compatible (even if thats the only driver that they provide via their page as seen Here) Tried to use Auto-Detect, couldnt install driver because card was disabled because it didnt have the drivers... (see what they did here?) Had to use a workaround with Samsung Update, the driver didnt appear as download so had to use search and downloaded the driver manually. Now the graphic card appears on device manager and catalyst but as 8800 series (not exact model), and cant check the card with neither dxdiag/GPU-z/HWMonitor when right-clicking on CCC only Intel card appears launching a game and using as "high performance" would speed it up a little but i cant be sure How to verify its working properly? HWMonitor wont show AMD card even when set to high performance Latest GPU-Z wont work because a problem with Intel's, and legacy ones wont either what can I do now? I don't even know if I fixed my problem or not, and i also want to to use Adobe Premier with it, and its locked (the option to run it with the amd card not intels) Edit: now it seems to work, but cant change the setting for adobe Premiere and other programs that i Need to

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• AutoHotKey temporarily rebind Winkey

  - by wes

  I've got a wireless keyboard that puts some media keys on top of the Function keys, so that by default F4 is actually lock (Rwin & l) and Fn+F4 is a real F4. So I'd like to basically switch those around. Here's what the key history shows: VK SC Type Up/Dn Elapsed Key ------------------------------------- 73 03E d 17.32 F4 ; Fn+F4 73 03E u 0.16 F4 5C 15C d 2.96 Right Windows ; F4 4C 026 d 0.00 L 5C 15C u 0.13 Right Windows 4C 026 u 0.00 L This doesn't do anything: SC15C & SC026::MsgBox,Pressed F4 But this prints that I hit F4 then goes to the login screen: Rwin & l::MsgBox,Pressed F4 So how can I stop it from switching to the login screen? Ideally I'd like F4 (which registers as Rwin & l) to just send F4, Fn+F4 to send Rwin & l, and also have them work with other keys (e.g., a manual !F4 should still close a window). Is this possible?

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• How can I keep SSH's know_hosts up to date (semi-securely)?

  - by Chas. Owens

  Just to get this out in front so I am not told not to do this: The machines in question are all on a local network with little to no internet access (they aren't even well connected to the corporate network) Everyone who has the ability to setup a man-in-the-middle attack already has root on the machine The machines are reinstalled as part of QA procedures, so having new host keys is important (we need to see how the other machines react); I am only trying to make my machine nicer to use. I do a lot of reinstalls on machines which changes their host keys. This necessitates going into ~/.ssh/known_hosts on my machine and blowing away to old key and adding the new key. This is a massive pain in the tuckus, so I have started considering ways to automate this. I don't want to just blindly accept any host key, so patching OpenSSH to ignore host keys is out. I have considered creating a wrapper around the ssh command the will detect the error coming back from ssh and present me with a prompt to delete the old key or quit. I have also considered creating a daemon that would fetch the latest host key from a machine on a whitelist (there are about twenty machines that are being constantly reinstalled) and replace the old host key in known_hosts. How would you automate this process?

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• Netgear CG3000D new Modem/Router - Random High Ping

  - by justin.chmura

  Cox just recently came out and looked at my internet and decided that the modem I had was causing high latency issue. The speed was fine but the ping would spike to around 100 and over when gaming or putting a load more than browsing on the line. After they replaced it, it seems like I get better latency, but when it spikes, I get upwards of over 300 ping with like 500 jitter. I figured I would hit the serverfault universe before sending another email to Cox. I opted not to do the Cox setup as it was an extra $20 which I thought would have just setup the wireless (which I can handle). Is it a setting or something that I missed that needs to be setup? The firmware for the CG3000D is awful and not fun to use. I did change some hidden settings on the RgServices.asp page (I'll attach a screenshot). I've also heard that the Router/Modem combos are awful and that I should go back and just ask for a modem stand-alone. Any input is helpful. All screenshots: http://imgur.com/a/JX6qu#0

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• Is there a way to make Skype show my contacts instead of my history in the sidebar?

  - by Paperflyer

  <rant> that new Skype on OSX is so amazingly awful its not even funny...</rant> Alright then, so, the most amazing feat of the new Skype version 5 is that whenever it starts up, it immediately shows me just about the most useless information possible: A log of my last conversation. Chances are, the last thing I did was to make a Skype call so all Skype shows me is a long list of Call Started and Call Ended. Amazingly useful. Actually, I probably started up Skype to make a call to someone, so the information I would like to see is the list of available contacts. Now the best thing would be to actually put this list in the sidebar, where it would be readily available no matter what I was doing last. Instead, Skype puts a history of all recent conversations there which might or might not contain the desired contact. At any rate, I have to scan that whole list to search for the desired contact every time I open up Skype, then I find out that the contact is not in there, hit the contacts icon in the top left and then finally can start making the call. Is there a way to just put the list of contacts in the sidebar and make Skype behave again?

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• IP to IP forwarding with iptables [centos]

  - by FunkyChicken

  I have 2 servers. Server 1 with ip 1.1.1.1 and server 2 with ip 2.2.2.2 My domain example.com points to 1.1.1.1 at the moment, but very soon I'm going to switch to ip 2.2.2.2. I have already setup a low TTL for domain example.com, but some people will still hit the old ip a after I change the ip address of the domain. Now both machines run centos 5.8 with iptables and nginx as a webserver. I want to forward all traffic that still hits server 1.1.1.1 to 2.2.2.2 so there won't be any downtime. Now I found this tutorial: http://www.debuntu.org/how-to-redirecting-network-traffic-a-new-ip-using-iptables but I cannot seem to get it working. I have enabled ip forwarding: echo "1" > /proc/sys/net/ipv4/ip_forward After that I ran these 2 commands: /sbin/iptables -t nat -A PREROUTING -s 1.1.1.1 -p tcp --dport 80 -j DNAT --to-destination 2.2.2.2:80 /sbin/iptables -t nat -A POSTROUTING -j MASQUERADE But when I load http://1.1.1.1 in my browser, I still get the pages hosted on 1.1.1.1 and not the content from 2.2.2.2. What am I doing wrong?

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• what is the reason behind window service stopped ,whether its due to LAN problems or any other issues

  - by Steve

  I have a windowservice which named Trunk which stopped one day i just want to know the reason behind it? this is an entry in the logs, Nov 15 17:54:04.318 :Trunk-1516:Trunk:handle_control_event:Received CTRL_LOGOFF_EVENT, ignore it Nov 25 15:54:52.157 :Trunk-1516:Trunk:ERROR - Process Restart Count (5) Exceeded for:C:\Program Files\secon\11.1.4\bin\vmd Nov 25 15:54:52.157 :Trunk-1516:Trunk:Stopping Trunk ... Nov 25 15:54:52.314 :Trunk-1516:Trunk:Shutting down, signaled C:\Program F Nov 20 15:54:20.345 :SCBridge.RegisterBridge:Exception in method: ScUtility.ScCommandException (0xa08990002): Exception from HRESULT: 0xa08990002 Supplemental Information: None available. at ScServer.ScServiceProcessorRegistryManager.Attach(String serviceProcessor, ScClientInformation clientInfo, FORCE_ATTACH_SPEC forceAttachToMaster) at ScServer.ScServiceProcessorRegistry.Attach(String serviceProcessor, Object clientInfo) at ScServer.ScServiceProcessorRegistry.Attach(String serviceProcessor) at ServerControlInterface.SCBridge.RegisterBridge(String SPName) for system APOLLOSP0 attempting to attach and register with the Bridge i had seen service is registered with specific account, so i thought that user logged off from the machine that may be the reason behind it or any LAN disconnection problem . But Having taken another look at the above entry we seem to have a constant failure being generated in vmd which causes Trunk to detect vmd requires a restart. Most of the time it works OK and the restart count is anything up to 4. In this case the Trunk log confirms that the Restart Count is 5 and so is considered to be exceeded. Presumably, this triggers the termination of the other services and Trunk is actually doing its job.So, coould this just be a timing issue and we need to increase the tolerance level (i.e restart count) or do we need to address the 0xa08990002 error in vmd?

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• Force request to miss cache but still store the response

  - by Tom Marthenal

  I have a slow web app that I've placed Varnish in front of. All of the pages are static (they don't vary for a different user), but they need to be updated every 5 minutes so they contain recent data. I have a simple script (wget --mirror) that crawls the entire website every 15 minutes. Each crawl takes about 5 minutes. The point of the crawl is to update every page in the Varnish cache so that a user never has to wait for the page to generate (since all pages have been generated recently thanks to the spider). The timeline looks like this: 00:00:00: Cache flushed 00:00:00: Spider starts crawling to update cache with new pages 00:05:00: Spider finishes crawling, all pages are updated until 1:15 A request that comes in between 0:00:00 and 0:05:00 might hit a page that hasn't been updated yet, and will be forced to wait a few seconds for a response. This isn't acceptable. What I'd like to do is, perhaps using some VCL magic, always foward requests from the spider to the backend, but still store the response in the cache. This way, a user will never have to wait for a page to generate since there is no 5-minute window in which parts of the cache are empty (except perhaps at server startup). How can I do this?

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• Network Security Device/Software

  - by Campo

  We currently run Symantec Antivirus Corporate 10.2. The software is really easy to manage on a network but the actual virus detection isn't bad but the malware detection is crap. We recently were infected with a email bot that got us put on some block lists. This has been resolved. I cannot have that happen again. I would like to find a program as easy to manage as symantec that I can install on all the user's workstations as well as the servers. We run a windows 2003 domain. We have a couple 2008 test servers in the environment. Most of the workstations are xp though I am using windows 7 and symantect is not compatible with this OS... So we need a solution that would cover all those operating systems. If it could be installed on macs too that would be a bonus though not necessary at all. This software must detect: Viruses AND Malware I am looking for something that combines the features in anti-malware programs like malwarebytes or spybot with an antivirus program like symantec or AVG. Alternatively if there is a piece of hardware that is a firewall, router, and packet inspection for virus/spam that would be the most ideal solution. I then could supplement with a piece of software that could pickup what the hardware misses. Thank you for your suggestions.

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• Can not open ports in iptables on CentOS 5??

  - by abszero

  I am trying to open up ports in CentOS's firewall and am having a terrible go at it. I have followed the "HowTo" here: http://wiki.centos.org/HowTos/Network/IPTables as well as a few other places on the Net but I still can't get the bloody thing to work. Basically I wanted to get two things working: VNC and Apache over the internal network. The problem is that the firewall is blocking all attempts to connect to these services. Now if I issue service iptables stop and then try to access the server via VNC or hit the webserver everything works as expected. However the moment I turn iptables back on all of my access is blocked. Below is a truncated version of my iptables file as it appears in vi -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 5801 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 5901 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 6001 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 5900 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 80 -j ACCEPT Really I would just be happy if I could get port 80 opened up for Apache since I can do most stuff via putty but if I could figure out VNC as well that would be cool. As far as VNC goes there is just a single/user desktop that I am trying to connect to via: [ipaddress]:1 Any help would be greatly appreciated!

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• Why am I experiencing random connection timeouts? (CentOS)

  - by Ryan

  I have a CentOS server setup that currently hosts several websites (all relative of each other in some form or another). As of recently throughout the day at the most random times the website speed will lag to a crawl and eventually hit a connection timeout. When I say random times this typically happens anywhere between 10am and 1pm usually, however, this morning this happened to me at 8am. I do not have a lot of familiarity with server knowledge as far as what I am looking for in this situation. What are some possible causes of why my server is slowing the websites down to a complete crawl or timing out? Are there specific things I should be checking for when this happens? I have noticed using: tail /var/log/httpd/access_log That usually when this down time occurs there are lot of IP addresses related to BingBot, Googlebot, and sometimes various bots or spiders that I am unfamiliar with. Could this be related and if so how can I avoid this from causing my websites to lag out? Thanks in advance for any help or advice. The websites that are timing out are built with PHP and use a MySQL database to display information.

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• Difficult to point-and-click target with Apple Magic Trackpad?

  - by Andrew Swift

  My Magic Trackpad is great for most things involving dragging and gestures, but for simple point-and-click use it is starting to get really annoying. For example, my bank has a numeric code that I need to enter from a visual grid on the screen, by clicking on the six numbers in order. To do this is quite difficult with the Magic Trackpad. Idea 1: it is because when you start dragging on the touchpad, there is a brief delay before the mouse starts to move. The delay might be enough to screw up my anticipation of where the cursor is going to go. Idea 2: it may have to do with the cursor acceleration. If I move it a little, the cursor moves a little. If I move it a lot, it goes much faster. I have tried various settings in the preference pane, and although the cursor does move more or less quickly, it doesn't seem any more or less easy to hit a given target. As I am writing this post, I tried a brief experiment -- I chose a spot on the page (the bracket in the superuser logo) and tried to move the cursor there in one quick movement. It's extremely difficult, even though I've been using Macs and touchpads since 1999. There is something about the behavior of the trackpad that is making it impossible for me to learn how to accurately predict where the cursor will end up. Does anyone else have this problem?

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• Video card not detected in POST on initial boot.

  - by Jeff M

  I have a minor problem with my desktop computer after cleaning it out for dust. When I first boot up the computer, the video card does not get detected so I can't see anything. In POST, I'm getting the "can't detect video card" beeps. The boot sequence continues normally, just without video. However, if I restart it (using the restart button) anytime after POST, it would boot up normally. I have no reason to think that the motherboard, video card or PSU got damaged in the process. It was working fine before, works fine after resetting. Took all the necessary precautions while cleaning. On the initial boot, I can hear the video card's fan power up but immediately power down and try again one more time only to fail. After the beep, resetting gets everything running and sounding normally. I've reseated the card a couple of times and reset the BIOS but doesn't seem to help. I'm hoping I won't have to take it out and remove and reinstall everything again. Does anyone recognize these symptoms to know exactly what the problem is? My guess is that the video card isn't getting enough juice initially to be running stable to be detected. I just don't know what I did (or didn't do) to get it to be in this state. It's not a high priority thing for me at the moment, just means I have to always reset it after initially turning it on but will eventually remove everything and reinstall if it comes to that. I don't think the specs are relevant here but just in case, here's the relevant stuff: Motherboard: Gigabyte P35-DS3P Video: EVGA GeForce 8600 GTS PSU: Antec True Power Trio 650W Built ~2 years ago, still running well

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• Computer hangs at BIOS screen. Cannot enter setup.

  - by d2jxp

  I have an HP Pavilion a6500f (it's a year out of warranty) and it's hanging on the blue HP BIOS screen. If I mash F10 while it's starting up, it will say "Entering Setup..." but I will see no results. It will hang there and not do anything. If I actually wait until I can see the screen and then hit F10, there's no response at all and the computer will sit at the BIOS menu. I've dusted and cleaned it out, reseated the memory, switched the RAM slots, and reset the CMOS battery using the reset jumper. I'm out of ideas. I'm pretty sure it's not a hard drive issue, since my problem is at the BIOS. After this post, I'll disconnect the hard drive and try to just boot without it. Anyone have any other ideas? Edit: Okay, so I tried disconnecting the hard drive and now I can get back into the BIOS. I reconnected it and I'm locked out again. So the problem is my hard drive.. I guess I should delete this post unless someone has any ideas as to what's wrong with the drive?

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• HAProxy crashes on all requests in 1.5-dev12

  - by Daniel Hough

  I'm having an issue where HAProxy is crashing with no explanation when I switch from 1.4.12 to 1.5-dev12. The reason I'm switching is for the SSL offloading. My config file doesn't have any errors, it's quite simple and it works well with 1.4 - but for some reason when I run it with 1.5-dev12 I see the logs noting that the two backends I have have been set up, and then when I hit one of the frontends, I get an HTTP 400 in the browser and suddenly HAProxy isn't running anymore when I check. I understand that a common workaround to the lack of SSL support for HAProxy is to use Stud, and I may go with that since I am in need of an SSL solution for my service, but before I dele into that world I thought I might see if anybody has experienced the same problems and might know how to fix it. The server is Ubuntu 10.04 and I followed the make instructions on the Exceliance blog here. EDIT: On the advice of Kyle Brandt, I did a bit more investigation. I attached gdb to the haproxy process and when the crash occurred this is what I got: Program received signal SIGSEGV, Segmentation fault. 0x0804e5c2 in dequeue_all_listeners (list=0x9e1a418) at src/protocols.c:184 184 list_for_each_entry_safe(listener, l_back, list, wait_queue) { P.S. HAProxy is awesome, so thank you Exceliance for providing us with something so useful :)

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• Server-side SSH jump hosts

  - by Dan Sosedoff

  Trying to figure out server side SSH jump hosts logic. Current network schema: [Client] <--> [Server A: hostname: a.com] <--> [Server B] [Client] <--> [Server A: hostname: b.com] <--> [Server C] Server A responds to both DNS records. Possible flow: Client opens a ssh connection with ssh [email protected]. Server A accepts it and should automatically jump user onto Server B with ssh user2@server_b.com. Client opens a ssh connection with ssh [email protected]. Server A accepts it and should automatically just user onto Server C with ssh user2@server_c.com. In other words, client should be able to connect to the target without performing any local configuration, assuming that we have a stock ssh config. The problem with ssh jumps is that user has to define hosts in local ~/.ssh/config file, which is not acceptable in my case. It needs to be a default sshd behavior. Im aware that you can define a custom command ~/.ssh/authorized_keys on server, but i dont think there is a way to properly detect source hostname where user tries to connect. It is possible at all ?

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• CD Drive not discovered

  - by user1009073

  I have a self built computer. it uses a P6T Deluxe motherboard, which has both SATA and IDE ports. This was built several years ago, and had an IDE CD/DVD drive. This drive started going bad (would not burn CDs correctly), so I decided to replace it. I had difficultly finding an IDE DVD drive, so I bought a SATA DVD drive. I opened the comnputer, took out the old DVD drive. I left the IDE cable in place, connected to the motherboard, but it is not connected to any drives. I hooked up the new DVD drive, both power and with a SATA data cable (SATA port 3 if I recall). (Sony Optiarc 24x , Newegg URL: http://www.newegg.com/Product/Product.aspx?Item=N82E16827118067 ) When I power on my computer, the drive does NOT show up in Explorer. I can hit the DVD eject button, and the drive will open up, so I know it at least is getting power. I thought, maybe something in the BIOS. When I go to BIOS, boot devices, it shows (1) floppy, (2) my hard drive (3) ATAPI CD Drive. The only other possible BIOS option I could find was uder 'Storage Configuration'. Configure Storage as: My setting is RAID, since I am using two drives in a RAID configuration. Other options were IDE and ACHI. Other than trying to find an IDE DVD drive, is there anything else I can try? The drive does not show up at all in Windows Explorer. I did put in a CD thinking that might help, but nothing happened. Thanks, GS

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• How to short-circuit Eclipse AutoComplete when "by relevance" Sorting is enabled?

  - by JRtim

  I know there's a number of autocomplete articles scattered around stack and eclipse relevant communities. I haven't seen a solution that I have been able to make work. Essentially it goes like this... I like sorting by relevance (since it usually has a decent priority), but sometimes I want to short circuit the autocomplete without having to hit x 2. If I have a class that has a couple methods like, getThis(), getThat, and get(), and eclipse picks up that I usually use getThis(), but every once in a while I want the get() method. So I type "Class" "period" "get(" -- whoops eclipse just filled in getThis(). When the sorting is alphabetically, this isn't an issue, but "by relevance" is a nice default. Just wondering if I'm missing the boat on something. Obviously one solution is to increase the latency on the autocomplete popup, but get() might just be an example. There might a situation where the method I want is a few parameters and maybe more than 3 keystrokes. Thank you.

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• Nginx load balancing and maintaining URLs

  - by Steve Klabnik

  I'm trying to use nginx as a load balancer, and it's working great. One problem, though. The load balancing box is at 123.123.123.123, and the backend box is 456.456.456.456. So I have this config: upstream backend { server 456.456.456.456; } server { listen 80; server_name 123.123.123.123; access_log off; error_log off; location / { proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_pass http://backend; } } This works great. I hit 123.123.123.123 in my browser, and the page comes up. But now the URL in the browser says http://456.456.456.456. Do I need to use a rewrite rule or something to keep the url correct? I don't want it to be different when going to different backed servers. None of the tutorials I've read have mentioned anything about this.

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