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• LVM and cloning HDs

  - by jcea

  Using Linux, I have several backup levels. One of them is a periodical sector by sector copy (using dd) of my laptop harddisk to an external USB disk. Yes, I have other backups too, like remote rsync. This approach (the disk dd) is OK when cloning a HDD with no LVM volumes, since I can plug the external disk anytime and mount the partitions simply mounting /dev/sdb* instead of /dev/sda*. Trivial and handy. Today I moved ALL my harddisk (including the /boot) to LVM. Everything works fine. I will stress it for a couple of days, and then I will do a sector by sector copy to my external harddisk. Now I have a problem, I guess. If in the future I plug the external USB HDD to recover any file, the OS will detect a duplicate LVM configuration, with the same name and the same UUID. Even doing a vgrename (which LVM would be renamed, the internal HDD or the external HDD?), the cloned UUID will not change. Is there any command to change name and UUID? Ideally I would clone the HDD and then change the LVM group name and its UUID, but I don't know how to do it. Another related issue would be... In the past I have booted my laptop using the external disk, using the BIOS boot menu and changing GRUB entries manually to boot from /dev/sdb instead of /dev/sda. But now my current GRUB configuration boots directly from a LVM logical volume, something like: set root='(LVM-root)' in my grub.cfg. So... What is going to happen with duplicated volumes? Any suggestion? I guess I could repartition my external harddisk and change backup strategy from dd to rsync, but this disk has windows installed too, and I really would like to have a physical "real" copy.

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• port forwarding with socks over proxy

  - by Oz123

  I am trying to browse a wiki that runs on a server inside one domain from another domain. The wiki is accessible only on the LAN, but I need to browse it from another LAN to which I connect with an SSH tunnel ... Here is my setup and the steps I did so far: ~.ssh/confing on wikihost: Host gateway User kisteuser Port 443 Hostname gateway.companydomain.com ProxyCommand /home/myuser/bin/ssh-https-tunnel %h %p # ssh-https-tunnel: # http://ttcplinux.sourceforge.net/tools/stunnel Protocol 2 IdentityFile ~/.ssh/key_dsa LocalForward 11069 localhost:11069 Host server1 User kisteuser Hostname localhost Port 11069 LocalForward 8022 server1:22 LocalForward 17001 server1:7100 LocalForward 8080 www-proxy:3128 RemoteForward 11069 localhost:22 from wikihost myuser@wikihost: ssh -XC -t gateway.companydomain.com ssh -L11069:localhost:22 server1 on another terminal: ssh gateway.companydomain.com Now, on my companydomain I would like to start firefox and browse the wiki on wikihost. I did: [email protected] ~ $ ssh gateway Have a lot of fun... kisteuser@gateway ~ $ ssh -D 8383 localhost user@localhost's password: user@wikiserver:~> My .ssh/config on that side looks like that: host server1 localforward 11069 localhost:11069 host localhost user myuser port 11069 host wikiserver forwardagent yes user myuser port 11069 hostname localhost Now, I started firefox on the server called gateway, and edited the proxy settings to use SOCKSv5, specifying that the proxy should be gateway and use the port 8383... kisteuser@gateway ~ $ LANG=C firefox -P --no-remote And, now I get the following error popping in the Terminal of wikiserver: myuser@wikiserver:~> channel 3: open failed: connect failed: Connection refused channel 3: open failed: connect failed: Connection refused channel 3: open failed: connect failed: Connection refused Confused? Me too ... Please help me understand how to properly build the tunnels and browse the wiki over SOCKS protocol. update: I managed to browse the wiki on wikiserver with the following changes: host wikiserver forwardagent yes user myuser port 11069 hostname localhost localforward 8339 localhost:8443 Now when I ssh gateway I launch Firefox and go to localhost:8339 and I hit the start page of the wiki, which is served on Port 8443. Now I ask myself is SOCKS really needed? Can someone elaborate on that ?

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• How can I both pipe and display output in Windows' command line?

  - by Bob

  I have a process I need to run within a batch file. This process produces some output. I need to both display this output to the screen and send (pipe) it to another program. The bash method uses tee: echo 'ee' | tee /dev/tty | foo Is there an equivalent for Windows? I am happy to use PowerShell if necessary. There are tee ports for Windows, but there does not appear to be an equivalent for /dev/tty, which complicates matters. The specific use-case here: I have a program (launch4j) that I need to run, displaying output to the user. At the same time, I need to be able to detect success or failure in the script. Unfortunately, this program does not set an exit code, and I cannot force it to do so. My current workaround involves piping to find, to search the output (launch4j config.xml | find "Successfully created") - however, that swallows the output I need to display. Therefore, I need some way to both display to the screen and send the ouput to a command - and this command should be able to set ERRORLEVEL (it cannot run asynchronously).

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• Virus cleanup + dying drive = XP Automatic Updates crashing in esent.dll

  - by quack quixote

  Background I'm doing system recovery on an old WinXP SP1 system brought to me on suspicion of virus infection. After taking preliminary backups, I used MalwareBytes to detect and clean the infection. I might've even gotten it all. In the process, I've discovered (a) the system drive is showing signs of impending failure, and (b) the owner has been using the system's old crusty IE-6 instead of the up-to-date Firefox I've provided for him. So naturally, thinking I had a relatively stable system, I tried to hit the Windows Update site to install IE-8, in case further training doesn't stick. The update site told me it needed to update the installer, and I started that process. Soon after, wuauclt.exe started crashing, reporting addresses in module esent.dll. There's a Microsoft KB (910437) on a problem with that DLL, so I downloaded the hotfix and installed. The crashing did not stop. I attempted to install SP3 from the offline installer, but that didn't fix the issue either. The system is reporting a few hard drive / IDE controller errors, but they don't correlate to the crashes, so they aren't the direct cause. I've also attempted to rollback to the time between the infection removal and the first crashes, but that doesn't help. Question The hotfix I tried to install dealt with problem in transaction logs of the Extensible Storage Engine (ESE) database. I suspect this issue is similar, but that the database itself (whatever the ESE database is) is corrupted. Is there a way to clean or clear this database so that system operation returns to normal? Can someone enlighten me as to what the ESE database actually is, and where it resides? Can I just locate some files and delete them to bring this under control?

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• RTL8192SU + RTL8191E Linux Issue Installing Driver

  - by s32ialx

  OK I've read tons of fourms of people getting the onboard RTL8191E working and the RTL8192SU working dif is U = USB they are both N and i have both Toshiba L500D-00T pre-installed Win Vistax64-HP and i have obtained the free Win7x64-HP upgrade the onboard wificard sucks and can't hold a stable connection for more then 20minutes in windows but the usb is amazing. Now problem is i tried both Ubuntu and Mandriva with no resolve the issue is the onboard drive detects and actually SHOWS that it's there but no wireless networks detect so it's saying no SSID's are broadcasting which i know is a lie since I'm running a 2wire bell dsl modem with built in wifi and a Linksys wrt54g w/ DD-WRT firmware and both are broadcasting fine. Why don't i use the USB? new in Mandriva Linux Control Center 2010.0 it shows up in Other/Unknown as RTL8191S WLAN Adapter and on the right pane this shows up Identification Vendor: ?Manufacturer Realtek Description: ?RTL8191S WLAN Adapter Media class: ? Connection Bus: ?USB Bus PCI #: ?1 PCI device #: ?5 Vendor ID: ?0x0bda Device ID: ?0x8172 Sub vendor ID: ?0x0000 Sub device ID: ?0x0000 Misc Module: ?rtl819xU In the hardware device manager in mandriva it shows up as unknown but shows that it's realtek and that it's a 8192 chipset. but no option to for a driver install and when i do a make in terminal i get this error and no clue what it means [root@John-PC rtl8192se_linux_2.6.0010.1020.2009_64bit]# make make: *** /lib/modules/2.6.31.12-desktop-3mnb/build: No such file or directory. Stop. make: *** [all] Error 2 [root@John-PC rtl8192se_linux_2.6.0010.1020.2009_64bit]# any help appreciated. and just encase I'm running currently Mandriva Spring 2010 Free

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• winbind failing after a semi-random amount of time

  - by The Digital Ninja

  I have winbind set up to authenticate to our AD for samba shares. This is the third such server, and the only one having any issues. It seems after a random amount of time samba shares will just stop working. Winbind processes seem to be running but restarting them seems to fix the issue for a while. Looking at the logs have been kind of hit an miss and I don't know exactly when it fails. One interesting thing is that it seems to be pulling from another domain controller that it shoudlnt. I censored out the domain name in this example. But isnt there some way to block authentication to a domain? I'm not sure if this is a symptom or a cause of the issue. [2010/10/18 08:02:10, 0] winbindd/winbindd_cache.c:initialize_winbindd_cache(2577) initialize_winbindd_cache: clearing cache and re-creating with version number 1 [2010/10/18 09:15:54, 1] libsmb/clikrb5.c:ads_krb5_mk_req(686) ads_krb5_mk_req: krb5_get_credentials failed for [email protected] (Cannot find KDC for requested realm) [2010/10/18 09:15:54, 1] libsmb/cliconnect.c:cli_session_setup_kerberos(624) cli_session_setup_kerberos: spnego_gen_negTokenTarg failed: Cannot find KDC for requested realm [2010/10/18 09:15:54, 0] lib/util_sock.c:write_data(1139) write_data: write failure. Error = Connection reset by peer [2010/10/18 09:15:54, 0] libsmb/clientgen.c:write_socket(242) write_socket: Error writing 108 bytes to socket 18: ERRNO = Connection reset by peer [2010/10/18 09:15:54, 0] libsmb/clientgen.c:cli_send_smb(290) Error writing 108 bytes to client. -1 (Connection reset by peer)

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• Why do my Xcode default font starts to look ugly after some time, until I restart?

  - by mystify

  I plugged in an external monitor. All resolutions match perfectly. MacBookPro LCD is closed. After restarting Xcode editor fonts look very bad. Only in Xcode. When I restart the mac and DON'T use an external monitor, fonts look all right again. When I attach the monitor and close the LCD of the MacBookPro, fonts look nice. Then I close Xcode and reopen it: Fonts suck. Only way to get fonts look good is to disconnect external monitor and reboot, then reconnect external monitor, close LCD, wait, hit any key and let the external monitor be the only one. Fonts look nice - until I restart Xcode. I think it happens any time Xcode is launched with external monitor attached and ugly fonts survive until reboot. Unplugging external monitor and restarting Xcode doesn't help. It seems like Xcode isn't antialiasing them properly after something happens. Is there a fix for this problem? EDIT: After trying a few more times, it seems it is possible to get fonts to look nice by disconnecting external monitor and reopening xcode. Here are some little snapshots: GOOD FONT: UGLY FONT: You can see how dirty the ugly font looks. It's very hard to read and hurts in the eyes. Believe me. It sucks. Sometimes the little "i" are almost invisible. I make use of the very eye-friendly Dusk style of Xcode (go to preferences and choose that, if you haven't already. A real pleasure for your eyes)

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• Typing Japanese on Windows Vista with Dvorak

  - by Ken

  I'm using Windows Vista, and I type English with the Dvorak keyboard layout, and I want to be able to type Japanese text that way, too. I've figured out how to set it up to let me type Japanese here, but it uses QWERTY. What I've got so far is: click the "EN" in the taskbar, and select "JP" if the letter that appears in the taskbar is "A", hit alt-~ to change it to "?" type as if I was typing Romaji on a QWERTY keyboard, (e.g., left pinky home row, right ring finger top row), and hiragana appear (??) press spacebar to convert to kanji (e.g., ?), and return to accept That all works great, but it assumes I'm on QWERTY, which isn't very comfortable for me. I want everything the same, but to be able to type kana with Dvorak (e.g., left pinky home row, left ring finger home row - ??). I can do this on Mac OS, so it's not an unheard-of feature. But it was kind of an obscure setting to find, so I figure on Windows it's probably a really obscure setting. :-) But I haven't been able to find it yet. Thanks!

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• How to create partition when growing raid5 with mdadm.

  - by hometoast

  I have 4 drives, 2x640GB, and 2x1TB drives. My array is made up of the four 640GB partitions and the beginning of each drive. I want to replace both 640GB with 1TB drives. I understand I need to 1) fail a disk 2) replace with new 3) partition 4) add disk to array My question is, when I create the new partition on the new 1TB drive, do I create a 1TB "Raid Auto Detect" partition? Or do I create another 640GB partition and grow it later? Or perhaps the same question could be worded: after I replace the drives how to I grow the 640GB raid partitions to fill the rest of the 1TB drive? fdisk info: Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0xe3d0900f Device Boot Start End Blocks Id System /dev/sdb1 1 77825 625129281 fd Linux raid autodetect /dev/sdb2 77826 121601 351630720 83 Linux Disk /dev/sdc: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0xc0b23adf Device Boot Start End Blocks Id System /dev/sdc1 1 77825 625129281 fd Linux raid autodetect /dev/sdc2 77826 121601 351630720 83 Linux Disk /dev/sdd: 640.1 GB, 640135028736 bytes 255 heads, 63 sectors/track, 77825 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x582c8b94 Device Boot Start End Blocks Id System /dev/sdd1 1 77825 625129281 fd Linux raid autodetect Disk /dev/sde: 640.1 GB, 640135028736 bytes 255 heads, 63 sectors/track, 77825 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0xbc33313a Device Boot Start End Blocks Id System /dev/sde1 1 77825 625129281 fd Linux raid autodetect Disk /dev/md0: 1920.4 GB, 1920396951552 bytes 2 heads, 4 sectors/track, 468846912 cylinders Units = cylinders of 8 * 512 = 4096 bytes Disk identifier: 0x00000000

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• How to test server throughput

  - by embwbam

  I've always used apache benchmark to try to get a rough idea of how many requests/second my server can handle. I read that it was good, and it seemed to work well. Enter node.js, which is fully event-based, so it never blocks. If I run apache benchmark on a simple hello world server it can handle 2500 requests per second or so. However, if I put a timeout in the hello world function, so that it responds after 2 seconds, apache benchmark reports a dramatically reduced throughput: about 50/s. I'm running 100 concurrent connections with ab. If I increase the concurrency, it goes up. This makes sense, because apache benchmark is basically sending out requests in batches of 100, which come back every 2 seconds. 100 requests / 2 seconds = 50 requests / second If I increase the concurrency to about 400 or 500, it starts to crash. I don't think I've hit node.js's limit, I think I'm hitting a wall in my operating system on the number of open file descriptors or sockets or something. Any way I can get a good guess about how many requests my server can handle? I want to make sure the test computer isn't the one causing the problem.

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• How to burn a data DVD in Windows XP

  - by SabreWolfy

  I am trying to burn a data DVD (DVD+R) in Windows XP SP3 on a Dell desktop computer. The computer has a licensed copy of Nero 6.3. Nero indicates that an update to version 6.6 is available, but after following the link provided, it redirects me to the Nero website to purchase the upgrade. I'm not interested in doing this. After creating a project in Nero 6.3, inserting a blank DVD+R and trying to start burning the data DVD, Nero indicates that I should insert an appropriate disk into the drive. It does not seem to detect the blank DVD+R. I downloaded infrarecorder and cdrtfe from Sourceforge. Neither of these programs worked either. They both indicated that I should insert the correct media, with cdrtfe saying there is no disk in the drive. I tried with another blank DVD +R with the same effect. I inserted a CDR containing data into the drive and the Windows read read this CDR without a problem. I have no reason to believe that the drive is faulty. I am aware that Windows XP itself is not able to burn DVDs. However, it seems that three third-party software programs are not able to burn a data DVD in Window XP. The specifications provided in Nero indicate that DVD+R is compatible with the drive. How can I burn a backup data DVD in Windows XP?

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• Why do I have to log into hotmail twice?

  - by Tony Lee

  I just recently noticed I have to attempt a login into hotmail twice before it succeeds. Although I'm using Google Chrome (3.0.195.21), the symptoms are well described in a Mozilla thread. In short, I'm told: The e-mail address or password is incorrect. Please try again. The thread on mozilla's site that supposed to describe the latest details (and the 1st hit on google when I search for "hotmail login twice") requires an account to read so I'm hoping someone here has a good synopsis of what the cause is. I normally start at hotmail.com, which redirects to login.live.com/.... I can login by starting at mail.live.com, using IE8 or attempting a 2nd login. Oddly, if I start at login.live.com Chrome tells me there is a redirect loop. Does anyone know or have a public link to the root cause of the double login? (it is a hotmail account I'm login into) EDIT - Caused by my 'restricting how 3rd parties can use cookies'. If I allow all cookies, it works first time.

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• EC2: is an instance's public DNS stable? Can I rely on it not changing?

  - by Aseem Kishore

  I'm new to Amazon EC2. I've launched my first instance, and am using it as a web server. I see that it has a public DNS (a public URL), e.g.: ec2-123-45-6-789.compute-1.amazonaws.com I can successfully go to this server in my browser, hit it via cURL, etc. I want to use this web server for a back-end service in an app I'm building, so I placed this URL in my app's config, and it works great. But when I manually stop and re-started my instance, I see that the public DNS changes! I've read that this happens when you explicitly stop and re-start, but doesn't happen if you just "reboot". I don't plan on explicitly stopping and re-starting this server ever, but my question is: will this public DNS ever change on its own for any reason? E.g. if the machine abnormally crashes, or whatever. In other words, is it safe to ship an app that's wired to this URL? Thanks!

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• Switching between taskbar tasks sequentially

  - by Doug Kavendek

  In Firefox and some other tabbed interfaces, I can use Ctrl-PgUp/Down to cycle through tabs sequentially, based on their order in the tab list. I associate what is what based almost entirely on its position along the tab bar and what is next to what, so this is extremely useful for the way I keep track of things in my head. However, I haven't been able to find an equivalent for actual taskbar items in Windows, such that with a single shortcut will switch focus to the task item either to the left or the right of the current task in focus. There's a lot of existing shortcuts that I use (Alt-Tab, Ctrl-Esc, and their counterparts), but these use the window manager's stacking order, so it always changes based on what you've switched between in the past, and so their usefulness generally only lies in switching between two apps -- above that, I just can't keep that kind of stack in my head. The closest shortcut I've found is Winlogo-Tab, but it only moves a selector on the taskbar, so you have to hit space after moving it, and it also seems to originate the selector from the leftmost item every time (rather than relative to the current item). Am I just a weirdo and will have to write my own app to perform these actions?

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• Adding a Printer to my Print Server Failing

  - by Rudi Kershaw

  So, on the Windows Server page I read the following. Step 4: Add Network Printers Automatically Print Management (Printmanagement.msc) can automatically detect all the printers that are located on the same subnet as the computer on which you are running Print Management, install the appropriate printer drivers, set up the queues, and share the printers. To automatically add network printers to a printer server Open the Administrative Tools folder, and then double-click Print Management. In the Printer Management tree, right-click the appropriate server, and then click Add Printer. On the Printer Installation page of the Network Printer Installation Wizard, click Search the network for printers, and then click Next. If prompted, specify which driver to install for the printer. So, I have got to this point, made sure the printer (Canon MP620) is on and correctly plugged into the network. However, when I click "Search the network for printers", the wizard doesn't find it. Now, I can't get any further. Is there anything I could be doing wrong? How should I proceed moving forwards?

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• Apache22 on FreeBSD - Starts, does not respond to requests

  - by NuclearDog

  Hey folks! I'm running Apache 2.2.17 with the peruser MPM on FreeBSD 8.2-RC1 on Amazon's EC2 (so it's XEN). It was installed from ports. My problem is that, although Apache is running, listening for, and accepting connections, it doesn't actually respond to any or show them in the log at all. If I telnet to the port it's listening on and type out an HTTP request: GET / HTTP/1.1 Host: asdfasdf And hit enter a couple of times, it just sits there... Nothing. No response requesting with a browser either. There doesn't appear to be anything helpful in the error log: [Sun Jan 09 16:56:24 2011] [warn] Init: Session Cache is not configured [hint: SSLSessionCache] [Sun Jan 09 16:56:25 2011] [notice] Digest: generating secret for digest authentication ... [Sun Jan 09 16:56:25 2011] [notice] Digest: done [Sun Jan 09 16:56:25 2011] [notice] Apache/2.2.17 (FreeBSD) mod_ssl/2.2.17 The access log stays empty: root:/var/log# wc httpd-access.log 0 0 0 httpd-access.log root:/var/log# I've tried with accf_http and accf_data both enabled and disabled, and with both the stock configuration and my customized config. I also tried uninstalling apache22-peruser-mpm and just installing straight apache22... Still no luck. I tried removing all of the LoadModule lines from httpd.conf and just re-enabled the ones that were necessary to parse the config. Ended up with only the following loaded: root:/usr/local/etc/apache22# /usr/local/sbin/apachectl -M Loaded Modules: core_module (static) mpm_peruser_module (static) http_module (static) so_module (static) authz_host_module (shared) log_config_module (shared) alias_module (shared) Syntax OK root:/usr/local/etc/apache22# Same results. Apache is definitely what's listening on port 80: root:/usr/local/etc/apache22# sockstat -4 | grep httpd root httpd 43789 3 tcp4 6 *:80 *:* root httpd 43789 4 tcp4 *:* *:* root:/usr/local/etc/apache22# And I know it's not a firewall issue as there is nothing running locally, and connecting from the local box to 127.0.0.1:80 results in the same issue. Does anyone have any idea what's going on? Why it would be doing this? I've exhausted all of my debugging expertise. :/ Thanks for any suggestions!

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• Windows 7 boot problem on a Lenovo Thinkpad Z61m 9450HAG

  - by Matt Taylor

  I recently did a full upgrade of Windows 7 on my Thinkpad. Everything worked fine after up until the second reboot (the first reboot after some updates installed worked OK). At second reboot time the system would just black screen before the Windows logo appears. Disk/wireless/power/battery lights are all lit and the disk light is active (flickering). However, if I remove my battery and boot with just power it boots fine and quickly, and everything is OK. Any help on why this won't boot with battery plugged in is greatly appreciated. I need to take this battery out on the road/trains, etc. A little more detail on this story. The battery I had inserted when doing the (failed) boot was a long life battery. I have not tried inserting this battery when Windows is logged in. I have another (normal life) battery that I have charged up within Windows. It has just got to 100% and I am about to reboot with it in. I am using the Lenovo power manager to diagnose the battery - all seems OK. I will report back shortly as to the outcome. OK, so I chose the reboot option from within Windows, the machine seemed to shutdown okay, but then stalled. It didn't turn off completely and didn't reboot, but just sat, with the fan humming, somewhere in between! I had to hold the power button in for a few seconds until the fan stopped and then hit the power button again to boot the machine from fresh. One good thing, with this battery (the normal one) it booted into Windows 7 the first time with a battery! So, now I have rebooting issues. I have 3 errors in the event log: A timeout was reached (30000 milliseconds) while waiting for the lxdxCATSCustConnectService service to connect. The lxdxCATSCustConnectService service failed to start due to the following error: The service did not respond to the start or control request in a timely fashion. The following boot-start or system-start driver(s) failed to load: cdrom Any thoughts?

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• KVM error with device pass through

  - by javano

  I am running the following command booting a Debian live CD passing a host PCI device to the guest as a test and KVM errors out; kvm -m 512 -boot c -net none -hda /media/AA502592502565F3/debian.iso -device pci-assign,host=07:00.0 PCI region 1 at address 0xf7920000 has size 0x80, which is not a multiple of 4K. You might experience some performance hit due to that. No IOMMU found. Unable to assign device "(null)" kvm: -device pci-assign,host=07:00.0: Device 'pci-assign' could not be initialized lspci | grep 07 07:00.0 Ethernet controller: 3Com Corporation 3c905C-TX/TX-M [Tornado] (rev 74) I shoved an old spare NIC into my motherboard to test PCI pass through. I have searched the Internet with Goolge and found that errors relating to "No IOMMU found" often mean the PCI device is not supported by KVM. Does KVM have to support the device being "passed-through"? I though the point was to pass the device through and let the guest worry about it? Ultimately I want to pass-through a PCI random number generator, is this not going to be possible with KVM? Thank you.

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• Does MySQL log successful or attempted queries?

  - by Nathan Long

  I'm trying to track down a hit-or-miss bug in a web application. Sometimes a request completes just fine; sometimes it hangs and never finishes. I see that Apache now has several requests listed on the server-status page as "sending reply," and that doesn't change. I'm testing on localhost, so there shouldn't ever be more than one. Out of curiosity, I set MySQL to log all queries and I'm tail -fing the log file. When things go OK, I see a pattern like this: 20 Connect root@localhost on dbname 20 Query (some query #1) 20 Query (some query #2) (etc) 20 Quit 21 Connect (etc) When it hangs, I see a pattern like this: 22 Connect root@localhost on dbname 22 Query (some query #1) //nothing happens, so I try the post again 23 Connect root@localhost on dbname 23 Query (some query #1) //nothing happens; try again 24 Connect (etc) Here's my question: is MySQL logging attempted queries, or successful queries? In other words, if the last line I see is query #1, does that imply that query #1 or query #2 is hanging? My guess is that the one I don't see is the problem, because the last one I see looks fine, but maybe the one I don't see is too screwed-up for MySQL to process. Thoughts?

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• AD domain on web servers behind NAT - DNS issues?

  - by Ant

  I'm trying to setup an AD domain to manage the security between two Windows Server 2008 webservers that will sooner or later use NLB to balance website requests. I've hit a problem which I think is a simple solution and is down to DNS. My website domain is mydomain.com. The two servers are running behind a NAT firewall on the 10.0.0.0 IP range. I've setup the AD domain to be called ad.mydomain.com (as recommended by MS and a few other answers to questions on here). The second web server however doesn't want to join the domain, and gives an error pinning the problem on DNS - "ensure that the domain name is typed correctly" even though it queries the SRV record successfully and gets the correct DC back - dc.ad.mydomain.com. Doing a dcdiag /test:dns on the DC gives the Delegation error 'DNS Server dc.mydomain.com Missing glue A record'. I have a feeling I need to add something to the public DNS so that it in some way knows about ad.mydomain.com. Can anyone suggest whether I'm on the right track in adding something to the public DNS? Or whether it's something else? Many thanks

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• Weird caching bug where old version of the same web page (same filename) is still called (Windows 2008 R2, Tomcat 5.5)

  - by user717236

  This is definitely one of the strangest errors I've seen and it occurs intermittently. I am running Windows 2008 R2, IIS 7.5, and Apache Tomcat 5.5, by the way. Let's say I have two machines, A and B. Both A and B are running Windows 2008 R2. I have a web page called login.jsp on machine A, and I have a newer, modified version of login.jsp on machine B . Now, I copy the new login.jsp from machine B and paste it to machine A, replacing the older version with the same filename. For whatever reason, when I hit up the web page in my browser from a local machine (i.e. my laptop), it still recalls the old version of the web page, even though it's been replaced! I tried restarting IIS and Apache Tomcat. That didn't work. I tried restarting machine A and that didn't work. I tried a cold reboot of my local machine and that didn't work, either. So, I spoke to someone I can confide in for help. He said to open the login.jsp page in notepad, put a space in, save the file, and try again. Sure enough, it worked. He said he hasn't seen it in Windows 2003, but this is occurring with Windows 2008. What I don't understand is why did it work and what the heck is this error and I do I really diagnose it and resolve it for good, instead of the hack my colleague proposed? Is this bug related to Windows 2008, Windows 2008 R2, Tomcat, or something else entirely? Anyone else have the same problem? Thank you for any help.

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• Private staff network within public network

  - by pianohacker

  I'm the sysadmin at a small public library. Since I got here a few years ago, I've been trying to set up the network in a secure and simple way. Security is a little tricky; the staff and patron networks need to be separated, for security reasons. Even if I further isolated the public wireless, I'd still rather not trust the security of our public computers. However, the two networks also need to communicate; even if I set up enough VMs so they didn't share any servers, they need to use the same two printers at the very least. Currently, I'm solving this with some jerry-rigged commodity equipment. The patron network, linked together by switches, has a Windows server connected to it for DNS and DHCP and a DSL modem for a gateway. Also on the patron network is the WAN side of a Linksys router. This router is the "top" of the staff network, and has the same Windows server connected on a different port, providing DNS and DHCP, and another, faster DSL modem (separate connections are very useful, especially as we heavily depend on some cloud-hosted software). tl;dr: We have a public network, and a NATed staff network within it. My question is; is this really the best way to do this? The right equipment would likely make my job easier, but anything with more than four ports and even rudimentary management quickly becomes a heavy hit on our budget. (My original question was about an ungodly frustrating DHCP routing issue, but I thought I'd ask whether my network was broken rather than asking about the DHCP problem and being told my network was broken.)

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• If I partition a drive connected via eSata will it show different partitions when connected via USB?

  - by jeffreypriebe

  I have an odd problem with an external drive. I'm formatting it connected to my laptop prior to connecting it to my router. The HDD enclosure has both an eSata and USB connections. Generally, I connect it via eSata to my laptop. I created my partitions and connected it to the router, but I see partition information that is different than what I created. After chasing leads concerning large HDD size, I mindlessly connected the HDD to my laptop with USB. Lo! I see the same partitions as the router. Attached are screenshots using the same program and the HDD in question. The only difference is the connection. For the first, I connected via eSata and hit "refresh" on the partition program. Then, turned off the HDD, disconnected the eSata cable, and connected via USB. Power and refresh. eSata: reports a total HDD size of 2328 GB, with four partitions (the third being 1.96TB) USB: reports a total HDD size of 280 GB, with three partitions (the third being 279 GB) Any idea why this is happening? It looks like it clearly is an issue of the 4K sector size and not playing nice with the USB enclosure. I tried it eSata and USB in Windows and Linux and it appears consistently that eSata is reporting correctly, USB incorrectly.

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• Walkthrough/guide building aplication server for multi tenant web app [on hold]

  - by Khalid Adisendjaja

  The web app will detect a subdomain such as tenant1.app.com, tenant2.app.com, etc to identify tenant environment, each tenant environment will have a different database credential (port,db name,etc) but still connecting to the same database server. Each tenant should use app.com for their main domain, using their own domain is prohibitted. Each tenant will have their own rest api endpoint such as tenant1.app.com/api/v1/xxxx, tenant2.app.com/api/v1/xxxx, tenant3.app.com/api/v1/xxxx I've come to a simple solution by setting a wildcard subdomain (*.app.com) on webserver Apache/Nginx vhost configuration file. I have googled so many concept for building a multi-tenant app server but still don't understand how to really done it, what is the right way to do it and what is actually required to do this task. So I've come to this questions, Do I need a proxy server, dns masking, etc.. How to monitor each tenants activity What about server performance, load balancing, and scalability How to setup ssl certificate for each tenant what about application cache for each tenant Is it reliable to use the setup for production etc ... I have a very litte experience on server infrastructure, so I'm looking for a DIY walkthrough, step by step guide, or sophisticate solution ready to implemented for production

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• Can Current Backflow from Powered Hub's Adapter & cause PC Damage?

  - by SuperUserMan

  Getting this short: Can current flow from a powered USB hub's power adapter (lying 10 Meter away) back to computer via usb port and cause damage to Computer components like mobo, etc? What should be my concerns? Using a 2 Amp 5V Power adapter to power a 10m Long Active Repeater USB extension cable with 4 port HUB & plugging into PC's Front port, causes PC Chassis fan to keep running (thought slower than regular speed) Front Chassis HDD & power LED to turn on (though bit dim) may be other things which i cant detect/see at chip level, in motherboard?? All this even after PC is shut down (bit scary) More detail (in case still want to read): To run 4 High power (needing 450 mAmps) Wifi Adapters, far away from PC, Bought Active Repeater USB Extension Cable with 4 Ports & power port at far end http://www.ebay.com/itm/33FT-USB-2-0-Male-to-Female-Extension-Cable-Hub-Splitter-Adapter-with-4-USB-Port-/390846115254 Then added a locally bought 2 Amp 240V AC to 5V DC Power Adapter and plugged into USB hub which is a part of & situated at far end of a 10 Meter Active Repeater usb extension cable. Even 4 Wifi Adapters run fine (appear to) using this setup, but running chassis fan, dimly lighted Power & HDD LED, even when PC is switched off is bit scary and surely mean 5V & some current is flowing all though that 10 meter extension cable into my USB port & powering stuff. Can this cause damage? and what should be my concerns. Of course I can't switch off the power adapter (lying 10 meters away from PC) every time I switch off my PC to prevent this.

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