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  • Samba and Windows 7

    - by John Gaughan
    I built a new computer with the intention of it being primarily a home file server. Here is my setup: one desktop with Windows 7 64 HP one laptop with Windows 7 64 HP one desktop with Kubuntu 11.10 (server) The two desktops use static IPs, and I have hostnames mapped in the HOSTS files on all three systems. I have the same username/password combo on all three systems. I have been trying for a while now to set up Samba so the Windows 7 systems can see and use it. Even if I can get the server to show up, Windows is unable to log in. One of the first things I did was to enable LMv2 authentication, which this version of Samba (3.5.11) supports. The workgroup is set correctly. I can normally see the server, but cannot authenticate. Windows homegroup is turned off. Pinging between machines works fine, and the two Windows 7 systems work together flawlessly. What I am trying to do is set up Samba to use peer to peer networking using NTLM security and user-mode authentication. According to the documentation this is possible, but there are no examples that I could find. In all the googling I have done, I see a lot of people asking how to set this up but it either works for someone else and not for me (no idea what I'm missing), or it doesn't work. Has anyone gotten this to work? Is there a place I could download a smb.conf that is set up to work in this environment?

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  • Log and Block Website using Windows 2008 SBS

    - by John
    A client has asked me to setup Windows 2008 SBS to block and log websites from a list they will provide. As far as I know they only have standard edition which means I cannot use ISA. I was thinking of using squid authenticated against Active Directory. There is no budge for additional software. Does any one know of a different/better solution using either open source software or software that is available in Windows 2008 SBS? Thanks

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  • check_snmp with snmpv3 protocol giving "Unkown Report message" error

    - by John
    I'm trying to add a nagios command to use snmpv3 for monitoring printer status messages. When using the check_snmp command, I get the following error: External command error: snmpget: Unknown Report message Here is the command I'm typing in: ./check_snmp -P 3 -H <hostname> -L authPriv -U snmpuser -A snmppassword -X snmppassword -o 1.3.6.1.4.1.11.2.4.3.1.2.0 -C public -d "STRING:" -a MD5 These values for auth key, private key, username, etc all work when using snmpwalk. Can someone enlighten me as to what that error message really means? EDIT: It looks like check_snmp isn't taking my v3 credentials when passing over to snmpget. Here is my input with the verbose option: ./check_snmp -H <hostname> -o 1.3.6.1.2.1.2.2.1.10.1 -C public -m ALL -P 3 -L authPriv -U snmpuser -a MD5 -A snmppassword -x DES -X snmppassword -v And here is the output: /usr/bin/snmpget -t 1 -r 5 -m ALL -v 3 [authpriv] <hostname>:161 1.3.6.1.2.1.2.2.1.10.1 External command error: snmpget: Unknown Report message So I guess now my question would be: why isn't check_snmp passing all the commandline options to snmpget?

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  • What is the best way to clone Win7 machines?

    - by John Hoge
    I'm looking to buy 5 new Win7 boxes and would like to ease deployment by cloning the OS. What I would like to do is install a fresh OS (Dell doesn't seem to sell machines without preinstalled crapware anymore) and then install a few apps on the first one. Once it is just right, I want to clone the OS and install the image on the other four machines and just change the machine name. Is this possible to do without any extra third party software? What I am thinking of doing is backing up the disk image of the first machine to a network share, and then booting the others to the windows install DVD and restoring the same image on each machine. Has anyone had any luck with this technique?

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  • Diagnosing and debugging LAN congestion / connection issues

    - by John Weldon
    What are the top N tools / methodologies used to diagnose and repair network issues? Given a LAN, for example, where users are able to consistently ping an outside server, but any data intensive connections are flaky; how would you begin solving the network issues? I imagine issues like congestion, bandwidth constraints, throughput constraints, etc. are all factors, but I don't know how to diagnose those issues. I'm especially interested in LAN environments (rather than WAN)

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  • Mysql Fail to start

    - by John Naegle
    I'm running a Ubuntu 12.04 LTS Virtual Machine. Last week, the VM stopped unexpectedly now mysql will not start on the VM. These two events may be related, they may not be. When I try to connect: $ mysql ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) Then: $ sudo service mysql start start: Job failed to start And $ dmesg [ 1838.218400] type=1400 audit(1374633238.253:50): apparmor="STATUS" operation="profile_replace" name="/usr/sbin/mysqld" pid=18473 comm="apparmor_parser" [ 1838.358656] init: mysql main process (18477) terminated with status 1 [ 1838.358695] init: mysql main process ended, respawning [ 1839.269303] init: mysql post-start process (18478) terminated with status 1 And $ service mysql status mysql stop/waiting I think this means mysql is crashing when it starts: $ sudo mysqld start 130723 21:51:24 InnoDB: Assertion failure in thread 3064211200 in file fut0lst.ic line 83 InnoDB: Failing assertion: addr.page == FIL_NULL || addr.boffset >= FIL_PAGE_DATA InnoDB: We intentionally generate a memory trap. InnoDB: Submit a detailed bug report to http://bugs.mysql.com. InnoDB: If you get repeated assertion failures or crashes, even InnoDB: immediately after the mysqld startup, there may be InnoDB: corruption in the InnoDB tablespace. Please refer to InnoDB: http://dev.mysql.com/doc/refman/5.5/en/forcing-innodb-recovery.html InnoDB: about forcing recovery. 02:51:24 UTC - mysqld got signal 6 ; Per the manual, I went to the data directory (/var/lib/mysql) and ran this: myisamchk --silent --force */*.MYI Then: $ sudo mysqld ... InnoDB: Your database may be corrupt or you may have copied the InnoDB InnoDB: tablespace but not the InnoDB log files. See InnoDB: http://dev.mysql.com/doc/refman/5.5/en/forcing-innodb-recovery.html InnoDB: for more information. ... Is my database corrupt? What can I do to recover? Re-install mysql? Something less drastic? I'm fine with losing the database, I just want a working system.

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  • Overclock Failed

    - by John
    This morning when I tried to turn on my computer, the monitor would not display anything. The computer is on, but no UI on the monitor and no beep. I turned off the computer and turn it back on again. This time, the computer was on for about 2 seconds and automatically turned itself off for about 2 second and automatically turned itself back on. This happened two times without the monitor displaying any UI. On the third try, the computer did the same thing but when it turned itself back on, the monitor displayed this: American Megatrends Asus P8P67 Le ACPI bios Revision 1011 CPU Intel Core i5 2500K CPU @ 3.30GHz Speed: 3300MHz Total Memory 4096 MB (DDR3-1333) USB Devices Total: 0 Drive, 1 Keyboard, 1 Mouse, 2 Hubs Detected ATA/ATAPI Deivces SATA6G_2 Hitachi HDs821010CLA 332 SATA3G_1 Corsair force 3 SSD SATA3G_2 HL-DT-ST DB-RE UH12CS28 Overclocking Failed! Please enter setup to reconfigure your system. Press F1 to Run Setup. After I pressed F1, it went into the Asus EF1 Bios Utility. I couldn't do anything in there so I just exited. After which, the computer auto turned off and on again and I was able to use the PC like regular. This has never happened to this computer before and the day before, nothing seemed wrong, just regular use and some gaming.

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  • Free Hosting control panel

    - by John Maxim
    I'm in the mid of researching for one of the best hosting control panels. The server I run is Ubuntu and I have some experience with ISPConfig 2 & 3. Since I haven't explored any others available, what are the recommended ones for an Ubuntu server? I asked because I find that there seems to be some disabling and modifications required for an Ubuntu server if I need to use ispconfig which causes the server to change its actual way of running. It's quite good though, but any more recommended ones ? Something more organic? which doesn't require much breaking and changing. I'm not asking for the simple one, I don't mind going extra mile to install a powerful one but just try sticking with most Ubuntu's conventions will be an ideal one for me. And of course, if there happens to be something that meets the requirement as mentioned "Ubuntu conventions" and also simple to install at the same time, that'd be a bonus. Thanks in advance.

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  • regsvr32 fails on Windows Server 2003 - LoadLibaray ("my.dll") failed

    - by John Mo
    The DLL in question is a VB6 web class. When deploying, the old one needs to be unregistered and the new one registered. This has worked for many years but has failed now with the following error in a message box: LoadLibrary("c:...\my.dll") failed - The filename, directory name, or volume label syntax is incorrect. I don't think there's a problem with the DLL being (un)registered because it's failing to unregister the existing DLL that was at one time successfully registered. I don't think there's a filename or path problem. Regsvr32 is executed using a batch file where the full path to the DLL is specified. The path has not changed. The batch file has not changed. The DLL has not changed (at least not the old one I need to unregister). It's a programming problem to me because I need to release an updated DLL, but I'm thinking it's maybe an admin problem best suited to the talents of the serverfault audience. I'm hoping somebody knows about a Windows Update or something that might hose regsvr32. Thank you.

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  • How many times can data be read from a USB flash drive?

    - by John
    While I am aware that performing writes on a USB flash drive degrades the life expectancy of the device. I have heard the quantity of writes is anywhere from 100 thousand to 10 million, but I have not heard about number of read operations. Does reading from the device count toward this total? I am interested in writing only once to a flash drive and setting it to read-only. Then reading files from the device a thousand or more times per day, but am wondering if (at say 1,000 reads per day), the flash drive will need to be replaced within 100 days (assuming a 100,000 r/w cycle lifetime)?

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  • Copy seleted row to another worksheet

    - by ???? ???????
    There are for ex. 10 rows in one worksheet. When user clicks on one row it should be presented on another worksheet. Is it possible? Any help to do it? EDIT: To clarify: In one sheet are presented for example student exam marks on first year: John 10 8 10 7 Nick 8 9 8 9 Maria 7 8 8 7 On 2nd sheet there are student informations on the second year: John 9 9 10 8 Nick 8 8 9 7 Maria 7 6 8 8 I want to have give some kind of final certificate for student so summary information should be presented on the third sheet. I doesn't need to be on click. There could be drop down list on the third sheet.

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  • Http-Only cookies in WebLogic: what versions support them/how and why are they supported?

    - by John
    We want to make all cookies set by our webapp http-only. I only have a basic understanding of the benefits of doing this but I'm told by security people that it's a Good Thing (tm) Our app is running under JDK1.6.05 and WebLogic10.3.0 After way too much digging around Oracle's website for documentation, I've found good evidence that the first version of WebLogic to support http-only cookies is 10.3.1. By "support," I mean the cookie-http-only deployment-descriptor element. Before we go about upgrading, I'd be nice to have these questions answered: 1a) Is it accurate that WL10.3.1 is the first version to support http-only cookies and that we're out of luck with 10.3.0? 1b) If we do indeed need to upgrade, is there an easy to do so under Windows? I've heard people mention an "upgrade jar" that you just stick in the classpath but I can't find any mention of this by Oracle. Does an easy way exist, or do we need to do a full-install of the new version? 2) What does the cookie-http-only deployment-descriptor element do when enabled? Will it ensure all cookies set by the application have an http-only=true attribute? Will it do more or less? Is there anything I'll have to do programmatically? 3) Is there anything in general I should know about http-only cookies, getting my web app to take advantage of them, or other security concerns?

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  • measuring microseconds a process runs in Linux

    - by John Kube
    I'm looking to get the number of microseconds that a process takes to execute. Does anybody know how to do this on a Linux system? (I would settle for milliseconds, if that's as good as I can get.) NOTE: I don't think the time command will work to the accuracy I'm looking for...

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  • Windows 8 freezes after every other reboot on Lenovo W520 after about 10 seconds

    - by John Nevermore
    I have a Lenovo W520 laptop with i7-2760QM, intel 520 SSD and Nvidia Quadro 1000m. When i boot the PC with discrete graphics SET in BIOS, the computer totally freezes and the only thing left to do is reboot. This only happens with NVidia drivers for Windows 8 x64 installed (I've tried about 4 different drivers on Nvidia's site). When i boot the PC with integrated graphics set in BIOS, there is a momentary "hickup" after about 10 seconds (instead of freezing) and then everything is working fine. When i boot the PC with discrete graphics ON and no Nvidia drivers installed, the same thing happens as described above with integrated graphics. I've tried doing 1) bcdedit /set disabledynamictick yes 2) Disabling VT-x in BIOS (Seriously would prefer not to disable it, since i use VM-s almost every day) but no dice. The only thing that worked was to enable the Hyper-v feature. I was then able to boot properly with discrete graphics and Nvidia drivers installed, but since i use VMWare for VM development this was no solution (VMWare complained about not being able to launch because of Hyper-v being installed). I followed the instructions in this tutorial, to be able to run VMWare. Then the computer just booted into a black screen past Windows logo. How to boot Windows 8 x64 without freezing with Quadro 1000M enabled, Nvidia Drivers installed and Hyper-v feature preferably disabled ?

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  • Understanding Security Certificates (and thier pricing)

    - by John Robertson
    I work at a very small company so certificate costs need to be absolutely minimal. However for some applications we do Need to have our customers get that warm fuzzy not-using-a-self-signed certificate feeling. Since creating a "certificate authority" with makecert really just means creating a public/private key pair, it seems pretty clear that creating a public/private key pair FROM such a "certificate authority" really just means generating a second public/private key pair and signing both with the private key that belongs to the "certificate authority". Since the keys are signed anyone can verify they came from the certificate authority I created, or if verisign gave me the pair they sign it with one of their own private keys, and anyone can use verisigns corresponding public key to confirm verisign as the source of the keys. Given this I don't understand when I go to verisign or godaddy why they have rates only for yearly plans, when all I really want from them is a single public/private key pair signed with one of their private keys (so that anyone else can use their public keys to confirm that, yes, they gave me that public/private key pair and they confirmed I was who I said I was so you can trust my public/private key pair as belonging to a legitimate third party). Clearly I am misunderstanding something, what is it? Does verisign retire their public/private key pairs periodically so that my verisign signed key pair "expires" and I need new ones? Edit: I learned that the certificate has an internal expiration date and it also maintains an internal value stating whether it can be used to sign other certificates (i.e. sign other private/public key pairs stored as certificates). Can't I get a few (even one) non-signing certificate signed by someone like verisign that I can use for authentication/encryption without a yearly subscription?

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  • Exchange 2003 IMAP not working for some users

    - by John Gardeniers
    We normally don't have a need for IMAP connections from outside the company network but in order to allow a one user to use IMAP on a portable device I've turned it on and opened port 993 on the firewall. When the user in question was unable to get connected I tested this using Outlook remotely. Start by creating a new IMAP account in Outlook using a test account. No problems, it worked perfectly. Now try the same thing using the account of the user who actually needs to connect and it's a no-go. Outlook simply keeps prompting for logon credentials. Next I tried using my own account and that too failed. Testing with a couple of other accounts worked perfectly. Interestingly enough, with my own account I've used IMAP on a MAC before (internally) without a problem and I'm not aware of anything that has changed which could affect IMAP on my account. Checking the user settings in ADUC showed that all accounts have the same Exchange protocol settings. Specifically, IMAP is enabled. A check of the event logs on the server reveals no entries for the connection attempts, making this kind of difficult to debug. Has anyone here encountered such a situation and, even more importantly, what caused it?

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  • Can't connect to STunnel when it's running as a service

    - by John Francis
    I've got STunnel configured to proxy non SSL POP3 requests to GMail on port 111. This is working fine when STunnel is running as a desktop app, but when I run the STunnel service, I can't connect to port 111 on the machine (using Outlook Express for example). The Stunnel log file shows the port binding is succeeding, but it never sees a connection. There's something preventing the connection to that port when STunnel is running as a service? Here's stunnel.conf cert = stunnel.pem ; Some performance tunings socket = l:TCP_NODELAY=1 socket = r:TCP_NODELAY=1 ; Some debugging stuff useful for troubleshooting debug = 7 output = stunnel.log ; Use it for client mode client = yes ; Service-level configuration [gmail] accept = 127.0.0.1:111 connect = pop.gmail.com:995 stunnel.log from service 2010.10.07 12:14:22 LOG5[80444:72984]: Reading configuration from file stunnel.conf 2010.10.07 12:14:22 LOG7[80444:72984]: Snagged 64 random bytes from C:/.rnd 2010.10.07 12:14:23 LOG7[80444:72984]: Wrote 1024 new random bytes to C:/.rnd 2010.10.07 12:14:23 LOG7[80444:72984]: PRNG seeded successfully 2010.10.07 12:14:23 LOG7[80444:72984]: Certificate: stunnel.pem 2010.10.07 12:14:23 LOG7[80444:72984]: Certificate loaded 2010.10.07 12:14:23 LOG7[80444:72984]: Key file: stunnel.pem 2010.10.07 12:14:23 LOG7[80444:72984]: Private key loaded 2010.10.07 12:14:23 LOG7[80444:72984]: SSL context initialized for service gmail 2010.10.07 12:14:23 LOG5[80444:72984]: Configuration successful 2010.10.07 12:14:23 LOG5[80444:72984]: No limit detected for the number of clients 2010.10.07 12:14:23 LOG7[80444:72984]: FD=156 in non-blocking mode 2010.10.07 12:14:23 LOG7[80444:72984]: Option SO_REUSEADDR set on accept socket 2010.10.07 12:14:23 LOG7[80444:72984]: Service gmail bound to 0.0.0.0:111 2010.10.07 12:14:23 LOG7[80444:72984]: Service gmail opened FD=156 2010.10.07 12:14:23 LOG5[80444:72984]: stunnel 4.34 on x86-pc-mingw32-gnu with OpenSSL 1.0.0a 1 Jun 2010 2010.10.07 12:14:23 LOG5[80444:72984]: Threading:WIN32 SSL:ENGINE Sockets:SELECT,IPv6 stunnel.log from desktop (working) process 2010.10.07 12:10:31 LOG5[80824:81200]: Reading configuration from file stunnel.conf 2010.10.07 12:10:31 LOG7[80824:81200]: Snagged 64 random bytes from C:/.rnd 2010.10.07 12:10:32 LOG7[80824:81200]: Wrote 1024 new random bytes to C:/.rnd 2010.10.07 12:10:32 LOG7[80824:81200]: PRNG seeded successfully 2010.10.07 12:10:32 LOG7[80824:81200]: Certificate: stunnel.pem 2010.10.07 12:10:32 LOG7[80824:81200]: Certificate loaded 2010.10.07 12:10:32 LOG7[80824:81200]: Key file: stunnel.pem 2010.10.07 12:10:32 LOG7[80824:81200]: Private key loaded 2010.10.07 12:10:32 LOG7[80824:81200]: SSL context initialized for service gmail 2010.10.07 12:10:32 LOG5[80824:81200]: Configuration successful 2010.10.07 12:10:32 LOG5[80824:81200]: No limit detected for the number of clients 2010.10.07 12:10:32 LOG7[80824:81200]: FD=156 in non-blocking mode 2010.10.07 12:10:32 LOG7[80824:81200]: Option SO_REUSEADDR set on accept socket 2010.10.07 12:10:32 LOG7[80824:81200]: Service gmail bound to 0.0.0.0:111 2010.10.07 12:10:32 LOG7[80824:81200]: Service gmail opened FD=156 2010.10.07 12:10:33 LOG5[80824:81200]: stunnel 4.34 on x86-pc-mingw32-gnu with OpenSSL 1.0.0a 1 Jun 2010 2010.10.07 12:10:33 LOG5[80824:81200]: Threading:WIN32 SSL:ENGINE Sockets:SELECT,IPv6 2010.10.07 12:10:33 LOG7[80824:81844]: Service gmail accepted FD=188 from 127.0.0.1:24813 2010.10.07 12:10:33 LOG7[80824:81844]: Creating a new thread 2010.10.07 12:10:33 LOG7[80824:81844]: New thread created 2010.10.07 12:10:33 LOG7[80824:25144]: Service gmail started 2010.10.07 12:10:33 LOG7[80824:25144]: FD=188 in non-blocking mode 2010.10.07 12:10:33 LOG7[80824:25144]: Option TCP_NODELAY set on local socket 2010.10.07 12:10:33 LOG5[80824:25144]: Service gmail accepted connection from 127.0.0.1:24813 2010.10.07 12:10:33 LOG7[80824:25144]: FD=212 in non-blocking mode 2010.10.07 12:10:33 LOG6[80824:25144]: connect_blocking: connecting 209.85.227.109:995 2010.10.07 12:10:33 LOG7[80824:25144]: connect_blocking: s_poll_wait 209.85.227.109:995: waiting 10 seconds 2010.10.07 12:10:33 LOG5[80824:25144]: connect_blocking: connected 209.85.227.109:995 2010.10.07 12:10:33 LOG5[80824:25144]: Service gmail connected remote server from 192.168.1.9:24814 2010.10.07 12:10:33 LOG7[80824:25144]: Remote FD=212 initialized 2010.10.07 12:10:33 LOG7[80824:25144]: Option TCP_NODELAY set on remote socket 2010.10.07 12:10:33 LOG7[80824:25144]: SSL state (connect): before/connect initialization 2010.10.07 12:10:33 LOG7[80824:25144]: SSL state (connect): SSLv3 write client hello A 2010.10.07 12:10:33 LOG7[80824:25144]: SSL state (connect): SSLv3 read server hello A 2010.10.07 12:10:33 LOG7[80824:25144]: SSL state (connect): SSLv3 read server certificate A 2010.10.07 12:10:33 LOG7[80824:25144]: SSL state (connect): SSLv3 read server done A 2010.10.07 12:10:33 LOG7[80824:25144]: SSL state (connect): SSLv3 write client key exchange A 2010.10.07 12:10:33 LOG7[80824:25144]: SSL state (connect): SSLv3 write change cipher spec A 2010.10.07 12:10:33 LOG7[80824:25144]: SSL state (connect): SSLv3 write finished A 2010.10.07 12:10:33 LOG7[80824:25144]: SSL state (connect): SSLv3 flush data 2010.10.07 12:10:33 LOG7[80824:25144]: SSL state (connect): SSLv3 read finished A 2010.10.07 12:10:33 LOG7[80824:25144]: 1 items in the session cache 2010.10.07 12:10:33 LOG7[80824:25144]: 1 client connects (SSL_connect()) 2010.10.07 12:10:33 LOG7[80824:25144]: 1 client connects that finished 2010.10.07 12:10:33 LOG7[80824:25144]: 0 client renegotiations requested 2010.10.07 12:10:33 LOG7[80824:25144]: 0 server connects (SSL_accept()) 2010.10.07 12:10:33 LOG7[80824:25144]: 0 server connects that finished 2010.10.07 12:10:33 LOG7[80824:25144]: 0 server renegotiations requested 2010.10.07 12:10:33 LOG7[80824:25144]: 0 session cache hits 2010.10.07 12:10:33 LOG7[80824:25144]: 0 external session cache hits 2010.10.07 12:10:33 LOG7[80824:25144]: 0 session cache misses 2010.10.07 12:10:33 LOG7[80824:25144]: 0 session cache timeouts 2010.10.07 12:10:33 LOG6[80824:25144]: SSL connected: new session negotiated 2010.10.07 12:10:33 LOG6[80824:25144]: Negotiated ciphers: RC4-MD5 SSLv3 Kx=RSA Au=RSA Enc=RC4(128) Mac=MD5 2010.10.07 12:10:34 LOG7[80824:25144]: SSL socket closed on SSL_read 2010.10.07 12:10:34 LOG7[80824:25144]: Sending socket write shutdown 2010.10.07 12:10:34 LOG5[80824:25144]: Connection closed: 53 bytes sent to SSL, 118 bytes sent to socket 2010.10.07 12:10:34 LOG7[80824:25144]: Service gmail finished (0 left)

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  • Cooling for a small server room

    - by John Zwinck
    I have a server room about 12 feet square with an unfinished ceiling (exposed ducts and wiring). It houses a few servers (about ten, 1U and 2U) and some networking gear (four 1U switches, three routers, three modems, two cable boxes). With the door closed, it runs around 80 degrees Fahrenheit with half the servers turned on. When I turned on all the servers it reached 86 before I chickened out and propped the door open. The room is adjacent to air-conditioned office space, but does not itself have dedicated air conditioning. The ventilation for this room seems to be limited to one duct coming in at ceiling level, with a powered fan to draw air in, and one duct at ceiling level to allow air to flow out (it seems like it may just go into the drop ceiling cavity in the adjacent room). The adjacent office space stays fairly cool, but I'd prefer not to leave the door propped open all the time. There is both 110v and 208v service in the room, and plenty of power available. But there are no windows, and no floor drains (in a pinch we might be able to run a condensation hose through a small hole we'd drill in the wall to a nearby sink area, but only if absolutely necessary). I've considered portable A/C units, but I'm not sure on sizing and a lot less sure how we would run the exhaust hose(s). I suppose we could point one at the existing room exhaust duct (air return), but substantially modifying the duct is probably a no-no. I've also considered installing a fan box in the door of the room, but I'm concerned that this will only drop the temperature a little. Even right now, with all the equipment on, the room is at 83 degrees with the door open. And the main building A/C turns off daily at 6 PM to conserve energy, so the adjacent room temperature rises at night. How would you cool this room? Let's say the goal is to bring the temperature with everything running from a steady state of around 90 degrees down to 75 (equivalently, to offset the heat produced by ten 1U servers).

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  • A possible case of hacked email account. What kind of an attack is this?

    - by Rickesh John
    I own a Yahoo mail account. I am using this account for sending resumes and receive notifications from various job portals. But yesterday, I found that some 10-15 mails had been sent to random addresses from my account. Most of them had this format: hr@<companyname>.com I am pretty sure that I didn't send any mails to such addresses. Initially, I thought the job portals may be sending mails on my behalf and Yahoo is logging them, but then I saw the contents. The contents of all those mails were a URL, which I did not click. SCARED. Also, to top it off, my "Sending Name" has been changed to 'Nice Maria'!! o_0 I have taken the necessary measures and changed my password and the secret question. I cannot delete this account as this email is registered with all the job portals and other companies. Is this a simple case of my account being compromised or was I a victim of some web vulnerability? All the mails seem to be bot generated, with only a URL as the message body. Please advice.

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  • Tomcat performing terribly for no apparent reason

    - by John
    We're running a game application .WAR on Tomcat 6 on an Amazon EC2 server, 8 core processor, 7gb RAM. The application uses a MySQL database hosted on Amazon RDS. This Facebook application takes ages to access when a mere 20-30 users are playing it. Big difference from 1-2 users. The entire .WAR is ~4mb, all static content hosted elsewhere. The server has never been close to running out of RAM. The CPU utilization has never been higher than 13.5-14%. Even with ~500 users that completely slowed everything to a standstill. The thread count or threadpools isn't close to being maxed out. I heightened maxthreads but it didn't make a noticeable difference. My theory is that Tomcat can only use one processor core, which would explain why it was slowed to a halt even though CPU usage was stably at 13-14% at the activity spike. But I'm struggling to understand why it would only use one CPU core. There is no processor cap in server.xml. The app contains several servlets (4 or 5). There is no mention of SingleThreadModel in the Java code. WHAT could be causing the application to run extremely slowly? If there is only 1-5 people on the application it runs fine. With 20-30 people it's barely contactable.

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  • OpenSolaris: unable to contact repository, connected to internet via proxy

    - by John-ZFS
    Opensolaris b134: unable to set packages catalog this system is connected to internet via proxy, while this works on browser, how to make console/terminal aware? user1@opensolaris134:~# pkg set-authority -O http://pkg.opensolaris.org/dev opensolaris.org pkg set-publisher: Could not refresh the catalog for opensolaris.org user1@opensolaris134:~# pkg image-update pkg: 0/1 catalogs successfully updated: Unable to contact valid package server Encountered the following error(s): Unable to contact any configured publishers. This is likely a network configuration problem.

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  • Is it possible to mount a hot-swappable drive when it is turned on?

    - by John
    In my PC, I have a hot-swap drive. Usually I keep it off to save power. I only really use it when accessing from another PC on the network. Is it possible to configure /etc/fstab to mount this drive when I turn it on (without having to shake the mouse, open file manager and click the drive to have it mounted? Currently, I have: UUID=a869e5ca-7d3b-4d64-91e2-eadbecd8c9e5 /media/i-TVShows ext4 rw,nosuid,nodev,auto,user,uhelper=udisks 0 0 in my /etc/fstab file but it doesn't seem to do the trick. I want the drive to be user-mountable, on power on, with RW access, and I'm thinking of adding 'nofail'...this is my first time writing to the fstab file, and a lot of the parameters I took from the output of 'mount' so feel free to correct any oddness you find. Thanks

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  • RHEL5: Can't create sparse file bigger than 256GB in tmpfs

    - by John Kugelman
    /var/log/lastlog gets written to when you log in. The size of this file is based off of the largest UID in the system. The larger the maximum UID, the larger this file is. Thankfully it's a sparse file so the size on disk is much smaller than the size ls reports (ls -s reports the size on disk). On our system we're authenticating against an Active Directory server, and the UIDs users are assigned end up being really, really large. Like, say, UID 900,000,000 for the first AD user, 900,000,001 for the second, etc. That's strange but should be okay. It results in /var/log/lastlog being huuuuuge, though--once an AD user logs in lastlog shows up as 280GB. Its real size is still small, thankfully. This works fine when /var/log/lastlog is stored on the hard drive on an ext3 filesystem. It breaks, however, if lastlog is stored in a tmpfs filesystem. Then it appears that the max file size for any file on the tmpfs is 256GB, so the sessreg program errors out trying to write to lastlog. Where is this 256GB limit coming from, and how can I increase it? As a simple test for creating large sparse files I've been doing: dd if=/dev/zero of=sparse-file bs=1 count=1 seek=300GB I've tried Googling for "tmpfs max file size", "256GB filesystem limit", "linux max file size", things like that. I haven't been able to find much. The only mention of 256GB I can find is that ext3 filesystems with 2KB blocks are limited to 256GB files. But our hard drives are formatted with 4K blocks so that doesn't seem to be it--not to mention this is happening in a tmpfs mounted ON TOP of the hard drive so the ext3 partition shouldn't be a factor. This is all happening on a 64-bit Red Hat Enterprise Linux 5.4 system. Interestingly, on my personal development machine, which is a 32-bit Fedora Core 6 box, I can create 300GB+ files in tmpfs filesystems no problem. On the RHEL5.4 systems it is no go.

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  • linux: automount internal hard drive during boot?

    - by John Doe
    i try to create my own NAS and i need to automount the internal sata disks during boot i know i could do using fstab but im searching for a more easy/generalized way so its easier to scale with less handwork needed for every hard drive attached (or every mainboard added to the cluster) so anyone knows how to automount internal disks without using fstab like ubuntu does for usb drives? im using ubuntu server 9.10 thx all

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