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  • samba "username map" stopped to work after upgrade to 3.6

    - by Kris_R
    It was time to upgrade our group server (new HDs, problems with old installation of DRBD, etc..). Going as usually for CentOS i upgraded whole system from 6.3 to 6.4 The later one came with samba 3.6 as the old one was 3.5. I transferred most of users by copying /etc/password, /etc/shadow and samba accounts with pdbedit. Homes were on nfs-drive. The translation of unix accounts to samba accounts are located in /etc/samba/smbusers. Strangely enough on some windows clients there was problem to connect to samba-shares. In one case the only thing that worked was, instead of giving windows name, to use the unix account. In another one, it was possible to mount network drive and to open it in Windows Explorer, however other applications like "Total commander" at the attempt of opening this drive gave the message "Cannot connect to z:" (sometimes at this moment user/pass were requested). The smb.conf has following entries: [global] security = user passdb backend = tdbsam username map = /etc/samba/smbusers ... [Kris] comment = Kris's Private path = /SMB/Users/Kris writeable = yes read only = no browseable = yes users = krisr printable = no security mask = 0777 force security mode = 0 directory security mask = 0777 force directory security mode = 0 force create mode = 0775 force directory mode = 6775 The smbusers: # Unix_name = SMB_name1 SMB_name2 ... krisr = Kris Of course testparm runs without any errors. I was used from samba 3.5 to outputs of form Mapped user kris to krisr. Nothing like this happens now. Just message check_sam_security: Couldn't find user Kris in passdb. I read on web that some guys had problem with 3.6 and security = ADS, but these were not helpful for me. I'm seriously thinking about downgrading back to samba 3.5 but before this step I wanted to ask if somebody knows the solution of these problems.

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  • Windows Service with Logon a user

    - by David.Chu.ca
    I have a service running in a box with Windows XP and a box of Server (2003). There is one service running in autmactic mode. If I set the log on with a local user, the service will stop running if the user logs off the account from the Windows? In other words, in order to keep the service running, have I to keep the user as login mode? I understand that the service can be set as local system which will not need any one to login as long as the box is powered on. However, the service I need to run has to be running as a local user with the required permissions. The problem I have right now is that the box may reboot itself. If that happens, no one is logged in yet until some one has to log in as the required user. I want to make sure if the required user has to be as a log on user first. If that's the case, any suggestion to deal with unexpected reboot issue?

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  • Changes to grub in ubuntu 10

    - by jdege
    I've been running CentOS 5 for some years. I've decided to upgrade to Ubuntu, and with 10.04 just out, this seemed like a good time. I'm a tad paranoid, so I started off with a new set of drives - one to install on, one to backup to, and one as a spare. I removed my existing CentOS 5 drives, and did an install, and had no problems. I installed the server version, and used the default full-disk LVM installation. Next, I copies my backup scripts over, edited them to work with the new configuration, and did a test backup. That worked fine, as well. Then comes the real test, could I do an install of the backup onto the spare drive? (I won't put anything of importance on a system that doesn't have a reliable backup, and if I've never done a restore, it's not reliable.) I booted from a System Rescue CD (ver 1.5.3), with the spare drive as /dev/sda, and the backup drive as /dev/sdb. I had no trouble in partitioning, configuring LVM, formatting, making swap, or restoring the file systems. But when I got to restoring grub to the MBR, I ran into problems. My restore instructions from CentOS 5 said run grub, then enter two commands: root (hd0,0) setup (hd0) The first command exits with an error: "Checking if /boot/grub/stage1 exists ... no" I did some googling around, and found that the Grub2 included in recent Ubuntus is very different than the Grub 0.97 included in CentOS 5. One site suggested I use: grub-install --root-dir=/mnt/restore /dev/sda That appeared to work, but when I booted from the drive, I ended up at a grub prompt. Any ideas as to what I need to do? It seems like a simple problem, but my attempts at searching out answers on the web are being swamped by references to the old version of Grub. Help would be appreciated.

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  • How to use different scaling for every monitor?

    - by Mikael Koskinen
    One of the new features in Windows 8.1 is the new "Desktop display scaling", which allows user to configure scaling per monitor. I've been trying to get this working in preview but with no success. If I configure the scaling, it always affects all of my monitors. I have two monitors, the main one with a higher resolution and the secondary with "normal" resolution. The secondary monitor is used in portrait mode. I would like to configure the main monitor's scaling as the text is currently too small. Here's how things look at the configuration screen by default: Now if I adjust the scaling, click apply and do relogin, everything is bigger. On both of my monitors. I haven't clicked the "Let me choose one scaling level for all my displays", but still the slider seems to affect both of them. If I check the "Let me choose one scaling level", the UI changes to look similar to what we have in Windows 8: Still the problem persists. The scaling is applied to both of my monitors. So, it doesn't matter if I check the box or not, the scaling is always applied to all the displays. Any idea how I could get this to work in preview? I've read some comments which seem to indicate that this should work in preview, though Paul Thurrott mentioned at his Winsupersite article that he either didn't get this to work.

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  • Exchange 2010 remove Arbitration mailbox and mailbox store db

    - by JNM
    I have a problem with Exchange 2010 which is a nightmare for me. The problem is, that in Exchange management console i have several store databases in database management tab. only one is mounted, because i am using it. the second one is mounted, but it was used on other server before (now that server is dead). that database mounted status is UNKNOWN. The file of that database does not exist, but it still shows there. I can't remove it from management console, because it has mailboxes. i removed all mailboxes and disabled two arbitrary mailboxes. i can't delete it because i still have one arbitrary mailbox left. i can't move it, because it requires connection to dead server. i can't disable it, because i get error that it is the last one in organization. Can somebody help me? Solved it by using this command: Get-Mailbox -Arbitration -Database db1 | Remove-Mailbox -Arbitration -RemoveLastArbitrationMailboxAllowed Now i have another problem. Exchange management console shows public folder from different server which is dead now. That folder was copied here, but it is not needed anymore. Public folder file has been deleted, and records from ADSI edit has been removed too. But i can't remove that folder from management console. i get an error Exchange isn't able to check for public folder replicas for "My Public Folder Database". Anybody can help me with that?

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  • Change Laptop Wireless Card?

    - by Craig
    I have just bought a new Samsung RV511 Laptop (the i5 Version). Anyway it comes installed with a Broadcom Wifi Card, I have a Super Atheros Mini Wifi Card that I would like to swap for the Broadcom one. I use Atheros for security auditing purposes in Linux that the Broadcom one is not good for. Trouble is I have never got to the barebones of a laptop, although I am a Custom PC Builder, laptops i generally have no concern for. Take a look at this picture, I took one back panel off to reveal some of the components: I believe the Wireless Card is where I marked the arrow pointing too. That little white square thing appears to be a sticker of the Wifi card, it says WLAN. How can I access it to swap it with my Atheros one. Do I need to remove all the outermost screws? There are screws located to the right of where I scribbled in Yellow and next to the HDD, do I just remove those? I dont want to destroy the machine, only just got it today. Appreciate some help thanks.

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  • Two DHCP servers on the same network

    - by CesarGon
    We are setting up a routing link between the Windows Server 2008 networks of two different buildings in my organisation. Each network uses a different IP addressing scheme (one uses public addresses, the other one uses private), but the goal is having a single Windows Server domain across the gap between the buildings. The link is provided by a 100-Mbps point-to-point line. I have always understood that you should not have more than one DHCP server on a network. However, we are planning to put a domain controller on each building, and each domain controller will be a DNS server and a DHCP server as well. The intention is that a machine booting up in building A gets its IP address from the DHCP server closer to it, in building A, while a machine booting up in building B gets an address from the DHCP server in building B. Since the two buildings will be linked and the network will be only one, will this work? How can I avoid that a machine booting up in building A gets an address from the DHCP server in building B (or vice versa)? Thanks.

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  • Two DHCP servers on the same network

    - by CesarGon
    We are setting up a routing link between the Windows Server 2008 networks of two different buildings in my organisation. Each network uses a different IP addressing scheme (one uses public addresses, the other one uses private), but the goal is having a single Windows Server domain across the gap between the buildings. The link is provided by a 100-Mbps point-to-point line. I have always understood that you should not have more than one DHCP server on a network. However, we are planning to put a domain controller on each building, and each domain controller will be a DNS server and a DHCP server as well. The intention is that a machine booting up in building A gets its IP address from the DHCP server closer to it, in building A, while a machine booting up in building B gets an address from the DHCP server in building B. Since the two buildings will be linked and the network will be only one, will this work? How can I avoid that a machine booting up in building A gets an address from the DHCP server in building B (or vice versa)? Thanks.

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  • OpenWrt vs DDWrt

    - by Ioan Paul Pirau
    I have a TP-Link Wr1043ND router and I want to install one of these two firmwares: OpenWRT DD-WRT I read that I can install custom packages and do much more than I can with the original firmware. I would like to ask someone with experience in using both OpenWRT and DD-WRT which he would recommend and why. And to give a few reference points I'm interested in: reliability – network stability both on cable and wireless and on the usb drive performance – network speed, very important also usb drive speed configurability – the possibility to add extensions such as a torrent client, FTP, SSH, WWW and SVN server directly ease of use – the ease of installation and configuration of the router support/docs – how much info there is if you stumble upon a problem and you have to find some documentation, or if there's any free support (but that's a longshot) Of course I don't imagine that I will find the perfect firmware and that one is vastly superior over the other. Also if there's anyone out there who uses one of these firmwares on a TP-Link Wr1043ND, it would be great to get some feedback about the impact of the changes from the original firmware. P.S. I'm open also for Tomato if it's the better one.

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  • Mac creating files w/ wrong perms on samba share

    - by geoffjentry
    In my group, which is very heterogeneous in terms of machines, we use a samba share to collaborate on files and such. In all but one case, it works as expected (or at least close enough). The one exception is my boss' laptop, a snow leopard macbook air. On his desktop (also snow leopard), if he creates a file it ends up serverside with perms of 774, but when he creates it with the Air, the perms are 644. The key problem is the lack of group write permission on the laptop created files. What's really confusing is that everything that I've looked at on the two machines are identical - same version of OS X, same version of samba (3.0.25b-apple), same settings for the same software, etc. I can't imagine why one machine would be different than the other, but it is. To try to be complete w/ the description, here is the relevant portion of my smb.conf file: comment = my Share path = /path/to/share public = no writeable = yes printable = no force group = myshare directory mask = 0770 create mask = 0770 force create mode = 0770 force directory mode = 0770 EDIT: I looked at three more Macs and all of them worked as expected which leaves this one laptop the true oddball. This wasn't as good as a test as the others though, as they were all leopard.

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  • Is there a way to do something like LVM over NFS?

    - by warren
    I realize that since NFS is not block-level, LVM can't be used directly. However: is there a way to combine multiple NFS exports (from, say, 3 servers) into one mount point on a different server? Specifically, I'd like to be able to do this on RHEL 4 (or 5, and re-export the combined mount to my RHEL 4 server). expansion The reason I pegged lvm is that I want a bunch of exported mounts (servera:/mnt/export, serverb:/mnt/export, serverc:/mnt/export, etc) to all mount at /mnt/space so that my /mnt/space on this server (serverx) as one large filesystem. Yes, I know that re-exporting is generally a Bad Thing™ but thought it might work, if there was a way to accomplish this on a newer release as opposed to an older one From reading the unionfs docs, it appears that I can't use it over a remote connection - have I misread it? More accurately, since Union FS merges the contents of multiple branches, but makes them appear as one, it doesn't seem to go in reverse: I'm trying to mount a bunch of NFS points in a merged fashion, then write to them - not caring where data goes, a la LVM .

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  • How can I recover XFS partitions from a formatted HD?

    - by giuprivite
    I deleted the partition table of my HD. I wanted to format another one, but by mistake, I formatted the wrong one. Then I also created some new partition on it. Now I would like, if possible, to recover my old data. The old configuration was this: A primary NTFS partition with Windows, and a secondary partition with four logical partitions: a swap and three XFS partitions (two for Ubuntu and OpenSuSE, and one with the home for both systems). This is the output I get when I run gpart in a terminal: ubuntu@ubuntu:~$ sudo gpart /dev/sdb Begin scan... Possible partition(Windows NT/W2K FS), size(39997mb), offset(0mb) Possible extended partition at offset(39997mb) Possible partition(Linux swap), size(8189mb), offset(39997mb) Possible partition(SGI XFS filesystem), size(40942mb), offset(48187mb) Possible partition(SGI XFS filesystem), size(40942mb), offset(89149mb) Possible partition(SGI XFS filesystem), size(175044mb), offset(130112mb) End scan. Checking partitions... Partition(OS/2 HPFS, NTFS, QNX or Advanced UNIX): primary Partition(Linux swap or Solaris/x86): logical Partition(Linux ext2 filesystem): logical Partition(Linux ext2 filesystem): orphaned logical Partition(Linux ext2 filesystem): orphaned logical Ok. Guessed primary partition table: Primary partition(1) type: 007(0x07)(OS/2 HPFS, NTFS, QNX or Advanced UNIX) size: 39997mb #s(81915360) s(63-81915422) chs: (0/1/1)-(1023/254/63)d (0/1/1)-(5098/254/51)r Primary partition(2) type: 015(0x0F)(Extended DOS, LBA) size: 265245mb #s(543221849) s(81915435-625137283) chs: (1023/254/63)-(1023/254/63)d (5099/0/1)-(38912/254/2)r Primary partition(3) type: 000(0x00)(unused) size: 0mb #s(0) s(0-0) chs: (0/0/0)-(0/0/0)d (0/0/0)-(0/0/0)r Primary partition(4) type: 000(0x00)(unused) size: 0mb #s(0) s(0-0) chs: (0/0/0)-(0/0/0)d (0/0/0)-(0/0/0)r Looking the first eight lines, it seems the data are still there... but I don't know how to recover them. I have a free second HD of about 500 GB (the formatted one is 320 GB) that I can use for the recovery process.

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  • Utility to LOGICALLY compare two xml files?

    - by Matthew
    Right now we are attempting to build golden configurations for our environment. One piece of software that we use relies on large XML files to contain the bulk of its configuration. We want tot ake our lab environment, catalog it as our "golden configuration" and then be able to audit against that configuration in the future. Since diff is bytewise comparison and NOT logical comparison, we can't use it to compare files in this case (XML is unordered, so it won't work). What I am looking for is something that can parse the two XML files, and compare them element by element. So far we have yet to find any utilities that can do this. OS doesn't matter, I can do it on anything where it will work. The preference is something off the shelf. Any ideas? Edit: One issue we have run into is one vendor's config files will occasionally mention the same element several times, each time with different attributes. Whatever diff utility we use would need to be able to identify either the set of attributes or identify them all as part of one element. Tall order :)

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  • How can I trigger the creation of a new CLB file?

    - by Xperimental
    I'm currently having a problem with an application using COM running on Windows Vista. The application runs ok on one machine, but doesn't work on a similar configured machine. Both machines are virtual images originating from the same source image. While searching the registry for causes of this error, I came across the CLBVersion key in HKCR\CLSID which seems to have something to do with COM. The value of the key differs between the two machines (0x6 on the erroneous one, 0xc on the working one). Also there are files containing the same number in their filenames in the %SystemRoot\Registration directories of the machines. They are called R000000000006.clb and R00000000000c.clb respectively. I have already searched the windows event log for anything leading to the creation of those files (I have searched by the creation date of the files). Now a few questions regarding the registry keys and the files: Is it correct, that this is connected to COM? What is the function of the files? What causes the creation of a new "CLBVersion"? Is there a way for me to trigger the creation of a new CLB file? edit: I have now found out, that this has nothing to do with my application error. But I would still be interested in details about the registry key and the files. An installation of Visual Studio 2005 has brought the second machine to the same configuration (0xc in registry and file) as the other one.

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  • Raid1 with active and spare partition

    - by Daniel Baron
    I am having the following problem with a RAID1 software raid partition on my Ubuntu system (10.04 LTS, 2.6.32-24-server in case it matters). One of my disks (sdb5) reported I/O errors and was therefore marked faulty in the array. The array was then degraded with one active device. Hence, I replaced the harddisk, cloned the partition table and added all new partitions to my raid arrays. After syncing all partitions ended up fine, having 2 active devices - except one of them. The partition which reported the faulty disk before, however, did not include the new partition as an active device but as a spare disk: md3 : active raid1 sdb5[2] sda5[1] 4881344 blocks [2/1] [_U] A detailed look reveals: root@server:~# mdadm --detail /dev/md3 [...] Number Major Minor RaidDevice State 2 8 21 0 spare rebuilding /dev/sdb5 1 8 5 1 active sync /dev/sda5 So here is the question: How do I tell my raid to turn the spare disk into an active one? And why has it been added as a spare device? Recreating or reassembling the array is not an option, because it is my root partition. And I can not find any hints to that subject in the Software Raid HOWTO. Any help would be appreciated.

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  • Question About mk-table-checksum Results

    - by stevenmusumeche
    Hello, I have 1 master and 2 slaves. I am using MySQL 5.1.42 on all servers. I am attempting to use mk-table-checksum to verify that their data is in sync, but I am getting unexpected results on one of the slaves. First, I generate the checksums on the master like this: mk-table-checksum h=localhost --databases MYDB --tables {$table_list} --replicate=MYDB.mk_checksum --chunk-size=10M My understanding is that this runs the checksum queries on the master which then propagate via normal replication to the slaves. So, no locking is needed because the slaves will be at the same logical point in time when they run the checksum queries on themselves. Is this correct? Next, to verify that the checksums match, I run this on the master: mk-table-checksum --databases MYDB --replicate=IRC.mk_checksum --replicate-check 1 h=localhost,u=maatkit,p=xxxx If there are any differences, I repair the slaves like this: mk-table-sync --execute --verbose --replicate IRC.mk_checksum h=localhost,u=maatkit,p=xxxx After doing all of this, I repaired both slaves with mk-table-sync. However, everytime I run this sequence (after everything has already been repaired), one slave is perfectly in sync but one slave always has a few tables out of sync. I am 99.999% sure that the data on the slaves matches, since I repaired everything and the tables were not even updated on the master between runs of the checksum script. What would cause a few tables to always show out of sync on only one of the slaves? I am stuck. Here is the output: Differences on h=x.x.x.x,p=...,u=maatkit DB TBL CHUNK CNT_DIFF CRC_DIFF BOUNDARIES IRC product 10 0 1 product_id = 147377 AND product_id < 162085 IRC post_order_survey 0 0 1 1=1 IRC mk_heartbeat 0 0 1 1=1 IRC mailing_list 0 0 1 1=1 IRC honey_pot_log 0 0 1 1=1 IRC product 12 0 1 product_id = 176793 AND product_id < 191501 IRC product 18 0 1 product_id = 265041 IRC orders 26 0 1 order_id = 694472 IRC orders_product 6 0 1 op_id = 935375

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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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  • How can I recover XFS partitions from a formatted HD?

    - by giuprivite
    I deleted the partition table of my HD. I wanted to format another one, but by mistake, I formatted the wrong one. Then I also created some new partition on it. Now I would like, if possible, to recover my old data. The old configuration was this: A primary NTFS partition with Windows, and a secondary partition with four logical partitions: a swap and three XFS partitions (two for Ubuntu and OpenSuSE, and one with the home for both systems). This is the output I get when I run gpart in a terminal: ubuntu@ubuntu:~$ sudo gpart /dev/sdb Begin scan... Possible partition(Windows NT/W2K FS), size(39997mb), offset(0mb) Possible extended partition at offset(39997mb) Possible partition(Linux swap), size(8189mb), offset(39997mb) Possible partition(SGI XFS filesystem), size(40942mb), offset(48187mb) Possible partition(SGI XFS filesystem), size(40942mb), offset(89149mb) Possible partition(SGI XFS filesystem), size(175044mb), offset(130112mb) End scan. Checking partitions... Partition(OS/2 HPFS, NTFS, QNX or Advanced UNIX): primary Partition(Linux swap or Solaris/x86): logical Partition(Linux ext2 filesystem): logical Partition(Linux ext2 filesystem): orphaned logical Partition(Linux ext2 filesystem): orphaned logical Ok. Guessed primary partition table: Primary partition(1) type: 007(0x07)(OS/2 HPFS, NTFS, QNX or Advanced UNIX) size: 39997mb #s(81915360) s(63-81915422) chs: (0/1/1)-(1023/254/63)d (0/1/1)-(5098/254/51)r Primary partition(2) type: 015(0x0F)(Extended DOS, LBA) size: 265245mb #s(543221849) s(81915435-625137283) chs: (1023/254/63)-(1023/254/63)d (5099/0/1)-(38912/254/2)r Primary partition(3) type: 000(0x00)(unused) size: 0mb #s(0) s(0-0) chs: (0/0/0)-(0/0/0)d (0/0/0)-(0/0/0)r Primary partition(4) type: 000(0x00)(unused) size: 0mb #s(0) s(0-0) chs: (0/0/0)-(0/0/0)d (0/0/0)-(0/0/0)r Looking the first eight lines, it seems the data are still there... but I don't know how to recover them. I have a free second HD of about 500 GB (the formatted one is 320 GB) that I can use for the recovery process.

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  • Desktop bigger than screen

    - by alex
    I am using MSI U115 11" netbook (OS: Windows XP Home, graphics card: Intel Graphics Media Accelerator 500) and today after I switched it on, desktop was bigger than screen. To be exact: screen resolution was set to the lowest possible and I could move mouse outside of screen (but only below - left, right and up worked normally, mouse could not exceed screen boundaries). I changed resolution back to normal, but the problem with desktop being bigger than screen remained (as before, only lower part - cannot see task bar, etc. When I hit windows button on keyboard, only upper part of menu start is visible). What I already tried was changing all kind of graphics and screen settings - none of them helped. I also tried to restore the system to few days before, but it didn't help neither. What can I do to make the desktop look "normally"? EDIT: Some additional info regarding screen: Sorry it's in polish - but let me explain. There are two screens I can choose (Monitor domyslny means default screen), but the second one (the default one) is not available. After I choose it and click apply number 1. is used (and as you can see it has only two resolutions available. There are more in the second one - but without 1024x600 though). The two ticked and grayed out options here are Use this screen as the main one and Enlarge Windows desktop to match this monitor's size. Too bad I cannot change them. When I choose the second screen, the first box is unchecked and grayed out. The second box is available to be changed but it doesn't matter anyway as after applying changes it reverts to the first screen anyway. EDIT: Intel Graphics Media Control Panel screenshot.

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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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  • Redis as substitution for Memcache

    - by Boban P.
    We have distributed web app, and for now, as session handler, we use two separate instances of memcache in redundancy, so everything that is written in one memcache is also written in other. Memcache is fairly easy to install, use, and maintain but we have one problem: if one memcache fail, everything is fine, php comunicate with other instance which has all data (although, half of connections have a delay because they try to use failed one, wait a little, and then contact other memcache). When failed instance comes back to life again, it starts up empty. If established session request data from that instance, session fails, and user logs out, and that happens to half of users.So, we are thinking about to switch to redis for session handling, and maybe keep memcache for cache only. My questions are: If we setup redis instances as master-slave, and if master fails, can sentinel promote slave as new master and when old master comes back to life, will it stay as slave or not? Is redis call malloc at startup to allocate part of memory, like memcache or varnish, or it calls malloc for every key inserted? And what are pros and cons of that?

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  • How to Log Into a Web App Simultaneously with Different Account?

    - by Ngu Soon Hui
    I want to log into a web application, using at least ten account names at one single point of time ( I am not trying to do anything illegal, so don't worry). AFAIK, each tab in Chrome will share the same session, therefore, for one machine, one can use Google Chrome to log in at most 2 accounts, one in normal mode, another in Incognito mode. Is there anyway I can log into multiple accounts? I know I can open up IE and Firefox ( probably Safari etc) and login, but this is not really scalable as the number of web browsers is finite. Edit: My application is a localhost application; it resides on my computer. So proxy may not be that useful, and you now probably understand why it's nothing illegal. Edit2: CookieSwap seems like a good idea, but the problem is that once I swap the cookie, all the tabs and the FF apps' cookie are swap as well. Can the swapping be done on a tab basis or on application basis, so that on a dual-monitor, I can see the different login side-by-side?

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  • 502 Bad Gateway error after failed requests using Passenger

    - by Nicolas Buduroi
    I've got a staging server running nginx 1.0.5 using Rails 3.1 under Passenger 3.0.9. The problem is that a request sent just after one where there's an application error return 502 Bad Gateway. To test it I've set up a simple controller with an action that just raise a dummy exception. One request will show the Rails error message and the next one will show nginx 502 Bad Gateway error, then it goes back to the Rails application error, etc. While investigating this problem I've found out that load testing the application (which increase the number of application processes) make that issue disapear. That is until the extra processes are shutdown, then it reappear. I've tried setting the passenger_min_instances option, but doing so doesn't change anything and in this case each time an application error happen one instance is killed while after load testing all instances are kept alive. P.S.: Some people on my team told me that they've seen the 502 error even when there's no application error but I've not been able to reproduce that. Update: Just found out how to display the responses status codes using ab and most of them are 502!

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  • Build suggestion for mini itx server [on hold]

    - by Spyros
    I am looking to create a home server and since there does not seem to be a nice ready made one to purchase, i thought of building a mini itx one. I am not familiar with the best hardware/case to pick and therefore i thought i would ask for your experience. I will most probably install a simple linux distro, probably Debian and most probably without a desktop environment as well. Therefore, I am not looking for the best graphics card, though a decent one is preferred for sure. I would say that the most important thing is that the case/hardware play well with each other and the machine has decent specs ( i think something like 8gb RAM and 1TB hdd is most probably my most important things). I understand that this question can be closed as subjective, but it would be a great help for me if some of you guys who have been doing a similar build, can suggest something. I tried to find a stack exchange variant for the question, but it seems that this one more closely relates to the subject. But I will definitely understand it if people close it due to being subjective in nature. If you can maybe move it somewhere or so, please feel free to do so. Thank you for your time :)

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  • What's the piece of hardware listening on Facebook's or Wikipedia's IP address?

    - by Igor Ostrovsky
    I am trying to understand how massive sites like Facebook or Wikipedia work, for my intellectual curiosity. I read about various techniques for building scalable sites, but I am still puzzled about one particular detail. The part that confuses me is that ultimately, the DNS will map the entire domain to a single IP address, or a handful of IP addresses in the case of round-robin DNS. For example, wikipedia.org has only one type-A DNS record. So, people from all over the world visiting Wikipedia have to send a request to the one IP address specified in DNS. What is the piece of hardware that listens on the IP address for a massive site, and how can it possibly handle all the load coming from the requests for users all over the world? Edit 1: Thanks for all the responses! Anycast seems like a feasible answer... Does anyone know of a way to check whether a particular IP address is anycast-routed, so that I could verify that this really is the trick used in practice by large sites? Edit 2: After more reading on the topic, it appears that anycast is not typically used for dynamic web content. Anycast is usually used for UDP (e.g., DNS lookups), or sometimes for static content. One interesting thing to note is that Facebook uses profile.ak.fbcdn.net to host static content like style sheets and javascript libraries. Each time I ping this name, I get a response from a different IP address. However, I can't tell whether this is anycast in action, or a completely different technique. Back to my original question: as far as I can tell, even a large site will have a single expensive piece of load-balancing hardware listening on its handful of public IP addresses.

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