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• High Memory Utilization on weblogic

  - by Anup

  My Weblogic App Server shows high Memory Utization. The application seems to perform good without any memeory issues. Now that my traffix is going to increase i am worried about the memory and have a feeling things could go bad and need to take action now and i am confused as to should i increase The JVM memory on the weblogic instances which means adding more physical memory or should i increase the number of managed instances in the cluster. Would like to understand what does having high memory utilization mean and the advantage and disadvantages of adding JVM memory and adding managed instances. Thanks

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• Why won't these permissions do what I wish?

  - by Chris B.

  I am trying to make my folder owned by "apache" and then chmod that folder so that only the owner and group can access it. I am trying to do this to keep visitors from executing user-uploaded files directly. Here are the commands I am using: chown -R apache uploads chmod -R 770 uploads Source: http://www.mysql-apache-php.com/fileupload-security.htm Instead it seems that although it is keeping visitors from seeing the files, it is not allowing apache to serve them. Do you have any ideas?

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• I am unable to find login page for phpmyadmin

  - by Awan

  I was using phpmyadmin(in Wamp) without a password for root. I thought to set a password for root and goto Privileges page and set a password for root. Now whenever I go to localhost/phpmyadmin page it gives me the following error. MySQL said: Documentation #1045 - Access denied for user 'root'@'localhost' (using password: NO) phpMyAdmin tried to connect to the MySQL server, and the server rejected the connection. You should check the host, username and password in your configuration and make sure that they correspond to the information given by the administrator of the MySQL server. I don't know that what is the problem. It is not showing me a login type page to enter a username and password. Any idea that what is the problem ? Thanks

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• Windows 2003 SP1 terminal server printers Disappear after reboot - HP laserjet 4240

  - by Alex

  had working PCL6 laserjet 4240 driver. needed to downgrade to PCl5, tried but did not get clean install. tried again and it seemed to work (this is 2003 enterprise terminal server SP2) Have over 40 working laserjets (5, 4000, 4100 and 18 of the 4240) After normal nightly reboot the 18 4240 printers were 'gone'. Worked w/Microsoft who said bad HP driver issues - weird since they work on other terminal servers. downloaded latest version, etc. from HP site and can NOT get to work. As soon as I install, then do a Net Stop Spool and Net Start Spooler the printer is 'gone'. Current workaround is to use HP 4000 PCL5 drivers for all of these 4240 printers.

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• How to change default runlevel of Ubuntu (lucid) ?

  - by Adnan

  I have Ubuntu lucid on my home computer. Today I was experimenting with runlevels and I couldn't figure out how to change the default run level of Ubuntu. I can do that using /etc/inittab on Debian 504 but that file is not there in Ubuntu. I have searched on the web but couldn't figure out the answer. Thanks in advance.

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• Running a Vonage router behind a Linksys Firewall

  - by sludge

  I have a Vonage router used for outgoing VOIP calls. It gets a LAN ip by connecting to a Linksys WRT54g via DHCP. From there, it cannot actually get a WAN ip or connect out. What do I need to port forward?

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• MSSQL instance shuts down

  - by citronas

  I'm currently developing a new ASP.net project hosted on a Windows Server 2008 RC2 with an MSSQL 2008 Express Database. I have three SQL instances (for different purposes) running which currently all contain a single database. For apprently no reason, these instances tend to shut down after some days, for no apparent reason. There might be low or none traffic to these instances, because there might be some days in a row, where I can't develop. It now occured several times, that one or two of these three instances just shut down, so that I can't access the database, without manually starting the instance. I can't seem to find a event log entry for the shutdown, which is most likely because I just enabled logging (why is the default setting off?) So the questions are: * Why does a SQL instance shut down? (Is there such thing as a "Shut down instance after 3 days of inactivity"? * How can I achieve that the instances are running 24/7?

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• How IP addresses are mapped to Autonomous System Numbers?

  - by Parsa

  How IP addresses are mapped to Autonomous System Numbers (ASNs)? Is there any reference database for it? Then how are these Autonomous Systems are geographically located?

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• using flock in bash, why does killing a child process kill the parent process too?

  - by Robby

  In the code snippet below, I want the script to be limited to only running one copy at a time, and for it to restart server.x if it dies for any reason. Without flock involved, the loop correctly restarts if I kill the server process, but once I use flock to ensure the script is only running once, if I kill server.x it also kills the parent process. How can I ensure that killing the child process in a flock script keeps the parent around? #!/bin/bash set -e ( flock -x -n 200 while true do ./server.x $1 done ) 200>/var/lock/.m_rst.$1.lock

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• DFSR - What happens when one server gets maxed out?

  - by Jared

  What happens when one server in a DFSR pool maxes out its disk space? I am at the very beginning of my research in DFS/R and this struck me. I plan on implementing this on one server with RAID1 (160GB) and on another server with a RAID5 (500GB). What happens when my 1st server with 160GB disks, run out of space? Will it spill over to the 500GB server? Is it advisable at all to even have the RAID1 server in the DFSR pool? Because the RAID1 server is also my Domain Controller. Hope you guys can help me out here (OS are Win2k3R2)

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• proxy/vpn by dns entry

  - by rcourtna

  I've been using a service by unblock-us.com, which provides a proxy to Canadians/others allowing access to services that are locked down to only US ip addresses. This is easy enough to achieve by setting up a reverse proxy (eg: squid) on a US-hosted server, and then configuring your browser or OS to use that proxy. However, there is something that unblock-us does that I'm not sure how to duplicate. Rather than configuring your OS to use them as a proxy, you can simply change the DNS Server settings on your router to point to their addresses. Any requests to services they support are automatically proxied. The advantage to this is that you don't have to set up every computer in your house, and it "just works" with clients like ps3, xbox, android, etc. Disadvantage is you really don't have control over what gets proxied, as well as there are privacy concerns I suppose. How can I achieve this same functionality on my own us-based slice?

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• Get Kerberos ticket with SSH

  - by Joel

  I'd like to get a Kerberos 5 ticket when ssh-ing to get to a fully-automated login solution. Typically, you use kinit first and then ssh: > kinit user@DOMAIN user@DOMAIN's Password: (enter password) > ssh user@host (successful login) I'd like to simply run ssh user@host and automatically check for a Kerberos ticket. If one isn't there, I'd like it to get a ticket and then log in. > kdestroy > ssh user@host user@DOMAIN's Password: (enter password) (successful login) (log off of host) > klist (show ticket info) I'd like this to be configured on a per-host basis, as not every host I log into supports Kerberos.

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• CopSSH SFTP -- limit users access to their home directory only

  - by bradvido

  Let me preface this by saying I've read and followed these instructions at the FAQ many times: http://www.itefix.no/i2/node/37 It does not do what the title claims... It allows every user access to every other user's home directory, as well as access to all subfolders below the copssh installation path. I'm only using this for SFTP access and I need my users to be sandboxed into only their home directory. If you know a fool-proof way to lock users down so they can see only their home directory and its subfolders, stop reading now and reply with the solution. The details: Here is exactly what i tried as I followed the FAQ. My copSSH installation directory is: C:\Program Files\CopSSH net localgroup sftp_users /ADD **Create a user group to hold all my SFTP users cacls c:\ /c /e /t /d sftp_users **For that group, deny access at the top level and all levels below cacls "C:\Program Files\CopSSH" /c /e /t /r sftp_users **Allow my user group access to the copSSH installation directory and its subdirectories For each sftp user, I create a new windows user account, then I: net localgroup sftp_users sftp_user_1 /add **Add my user to the group I've created Open the activate user wizard for CopSSH, choosing the user, "/bin/sftponly" and Remove copssh home directory if it exists **Remains checked Create keys for public key authentication **Remains checked Create link to user's real home directory **Remains checked This works, however, every user has access to every other user's home directory as well as the CopSSH root directory.... So I tried denying access for all users to the user home directory: cacls "C:\Program Files\CopSSH\home" /c /e /t /d sftp_users **Deny access for users to the user home directory Then I tried adding permissions on a user-by-user basis for each users home\username folder. However,these permission were not allowed by windows because of the above deny rule i created at the home directory was being inherited and over-riding my allow rule. The next step for me would be to remove the deny rule at the home directory and for each user folder, add a deny rule for every user it doesn't belong to, and add an allow rule for the one user it does belong to. However, as my user list gets long, this will become very cumbersome. Thanks for the help!

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• Why is my IMAP port not showing as open ( yet it works? )

  - by Leo

  Ive recently setup Postfix and Dovecot IMAP on a Debian Lenny box. Sending to this domain works fine and reading the email via IMAP works fine too. I'm curious though as to why when running nmap, port 10143 is not shown as open. nmap -sS -O 127.0.0.1 Starting Nmap 4.62 ( http://nmap.org ) at 2011-11-26 21:30 GMT Interesting ports on localhost.localdomain (127.0.0.1): Not shown: 1711 closed ports PORT STATE SERVICE 22/tcp open ssh 25/tcp open smtp 80/tcp open http 3306/tcp open mysql Am I missing something with NMAP? Thanks Leo

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• Logging hurts MySQL performance - but, why?

  - by jimbo

  I'm quite surprised that I can't see an answer to this anywhere on the site already, nor in the MySQL documentation (section 5.2 seems to have logging otherwise well covered!) If I enable binlogs, I see a small performance hit (subjectively), which is to be expected with a little extra IO -- but when I enable a general query log, I see an enormous performance hit (double the time to run queries, or worse), way in excess of what I see with binlogs. Of course I'm now logging every SELECT as well as every UPDATE/INSERT, but, other daemons record their every request (Apache, Exim) without grinding to a halt. Am I just seeing the effects of being close to a performance "tipping point" when it comes to IO, or is there something fundamentally difficult about logging queries that causes this to happen? I'd love to be able to log all queries to make development easier, but I can't justify the kind of hardware it feels like we'd need to get performance back up with general query logging on. I do, of course, log slow queries, and there's negligible improvement in general usage if I disable this. (All of this is on Ubuntu 10.04 LTS, MySQLd 5.1.49, but research suggests this is a fairly universal issue)

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• Aruba Wireless Controller 200 and AP70 manual

  - by techie

  I have an Aruba wireless system that is currently in use but there is no documentation from the previous person in charge. I have no manuals or login information for the wireless controllers and APs. I checked the Aruba website and you need to register to access the support information but registration isn't instant and takes several days. I've waited for quite a while now and have tried googling and checking the Aruba forums but have found no indication of a manual. What I really need is the ability to reset the controller and APs so I can access the device with the default username and password. There is no reset button on this device so I have no idea how you go about resetting the controller and APs. Hm it seems I can't create a new tag as a new user. If possible can someone add an "Aruba" tag?

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• Problem configuring php-fpm with nginx

  - by Nisanio

  First of all: I'm not an expert in configuring things. This is very new for me, so, my apologies in advance. At work we have a Centos server. The guy who worked here before installed nginx. We need to made a php site, so, obviously, I need to set up php and make it work with nginx. Making short a very long tale, I had to replace the nginx binary with a new one (because the older was compile without fast-cgi), and I had to recompile and install php (because the new version has fpm). Then I struggle with the config files, making this nginx.conf (not all the file) user php; location ~ \.php$ { fastcgi_pass 127.0.0.1:9000; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME /scripts$fastcgi_script_name; include fastcgi_params; } and uncomment some parameters in php-fpm (to much to detail here, but the important is that group and user are "php") I never could start the php-fpm with the instructions of the book sudo /usr/sbin/php-fpm start But after look at the net, I found this sudo /usr/local/sbin/php-fpm --fpm-config=/usr/local/etc/php-fpm.conf This worked (I think) I restarted nginx. But... nothings happens with php... My calls to php files (via firefox) doesn't even appear in the log (/opt/nginx/logs/error.log) I'm really, really exhausted and lost... Could anyone help me, pleaaase.... :( Thanks in advance

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• Unable to install rubygems in ubuntu 10.04

  - by loganathan

  I had installed the ruby 1.8.7 with patch level 253 successfully on my ubuntu 10.04, but while installing ruby gems I am facing the below error, can anybody help me on this. ruby -v ruby 1.8.7 (2010-04-19 patchlevel 253) [i686-linux], MBARI 0x8770, Ruby Enterprise Edition 2010.02 gem install mongrel *** longjmp causes uninitialized stack frame ***: /usr/bin/ruby terminated ======= Backtrace: ========= /lib/tls/i686/cmov/libc.so.6(__fortify_fail+0x50)[0x3612d0] /lib/tls/i686/cmov/libc.so.6(+0xe223a)[0x36123a] /usr/bin/ruby[0x80577b9] /usr/bin/ruby[0x80577d5] /usr/bin/ruby(rb_thread_schedule+0x9fc)[0x80652ac] /usr/bin/ruby(rb_thread_kill+0x14)[0x8066c74] /usr/bin/ruby[0x806071d] /usr/bin/ruby[0x80608b9] /usr/bin/ruby[0x806a869] /usr/bin/ruby[0x806a290] /usr/bin/ruby[0x8060601] /usr/bin/ruby[0x80608b9] /usr/bin/ruby[0x806a869] /usr/bin/ruby[0x806995b] /usr/bin/ruby[0x8060601] /usr/bin/ruby[0x80608b9] /usr/bin/ruby[0x806aaa5] /usr/bin/ruby[0x8069d54] /usr/bin/ruby[0x8060601] /usr/bin/ruby[0x80608b9] /usr/bin/ruby[0x805df2d] /usr/bin/ruby[0x8069581] /usr/bin/ruby[0x805de52] /usr/bin/ruby[0x806a0eb] /usr/bin/ruby[0x805e630] /usr/bin/ruby[0x8060601] /usr/bin/ruby[0x80608b9] /usr/bin/ruby[0x806aaa5] /usr/bin/ruby[0x806a715] /usr/bin/ruby[0x8060601] /usr/bin/ruby[0x80608b9] /usr/bin/ruby[0x806a869] /usr/bin/ruby[0x805e48b] /usr/bin/ruby[0x805de52] /usr/bin/ruby[0x8060601] /usr/bin/ruby[0x80608b9] /usr/bin/ruby[0x806aaa5] /usr/bin/ruby[0x805e58a] /usr/bin/ruby[0x805e4aa] /usr/bin/ruby[0x805de52] /usr/bin/ruby[0x8060601] /usr/bin/ruby[0x80608b9] /usr/bin/ruby[0x806a869] /usr/bin/ruby[0x805e48b] /usr/bin/ruby[0x80693f1] /usr/bin/ruby[0x805de52] /usr/bin/ruby[0x806a0eb] /usr/bin/ruby[0x805e630] /usr/bin/ruby[0x805de52] /usr/bin/ruby[0x8060601] /usr/bin/ruby[0x80608b9] /usr/bin/ruby[0x806a869] /usr/bin/ruby[0x805e48b] /usr/bin/ruby[0x805de52] /usr/bin/ruby[0x806a0eb] /usr/bin/ruby[0x805e630] /usr/bin/ruby[0x805de52] /usr/bin/ruby[0x8060601] /usr/bin/ruby[0x80608b9] /usr/bin/ruby[0x806aaa5] /usr/bin/ruby[0x805e48b] /usr/bin/ruby[0x805de52] /usr/bin/ruby[0x8060601] ======= Memory map: ======== 00110000-00112000 r-xp 00000000 08:06 3805677 /usr/lib/ruby/1.8/i686-linux/etc.so 00112000-00113000 r--p 00001000 08:06 3805677 /usr/lib/ruby/1.8/i686-linux/etc.so 00113000-00114000 rw-p 00002000 08:06 3805677 /usr/lib/ruby/1.8/i686-linux/etc.so 00114000-0012e000 r-xp 00000000 08:06 3805682 /usr/lib/ruby/1.8/i686-linux/syck.so 0012e000-0012f000 r--p 00019000 08:06 3805682 /usr/lib/ruby/1.8/i686-linux/syck.so 0012f000-00130000 rw-p 0001a000 08:06 3805682 /usr/lib/ruby/1.8/i686-linux/syck.so 00130000-00131000 r-xp 00000000 08:06 3805666 /usr/lib/ruby/1.8/i686-linux/fcntl.so 00131000-00132000 r--p 00000000 08:06 3805666 /usr/lib/ruby/1.8/i686-linux/fcntl.so 00132000-00133000 rw-p 00001000 08:06 3805666 /usr/lib/ruby/1.8/i686-linux/fcntl.so 00133000-00150000 r-xp 00000000 08:06 11403438 /lib/libgcc_s.so.1 00150000-00151000 r--p 0001c000 08:06 11403438 /lib/libgcc_s.so.1 00151000-00152000 rw-p 0001d000 08:06 11403438 /lib/libgcc_s.so.1 001e2000-00206000 r-xp 00000000 08:06 11403697 /lib/tls/i686/cmov/libm-2.11.1.so 00206000-00207000 r--p 00023000 08:06 11403697 /lib/tls/i686/cmov/libm-2.11.1.so 00207000-00208000 rw-p 00024000 08:06 11403697 /lib/tls/i686/cmov/libm-2.11.1.so 0024d000-00256000 r-xp 00000000 08:06 11403688 /lib/tls/i686/cmov/libcrypt-2.11.1.so 00256000-00257000 r--p 00008000 08:06 11403688 /lib/tls/i686/cmov/libcrypt-2.11.1.so 00257000-00258000 rw-p 00009000 08:06 11403688 /lib/tls/i686/cmov/libcrypt-2.11.1.so 00258000-0027f000 rw-p 00000000 00:00 0 0027f000-003d2000 r-xp 00000000 08:06 11403695 /lib/tls/i686/cmov/libc-2.11.1.so 003d2000-003d4000 r--p 00153000 08:06 11403695 /lib/tls/i686/cmov/libc-2.11.1.so 003d4000-003d5000 rw-p 00155000 08:06 11403695 /lib/tls/i686/cmov/libc-2.11.1.so 003d5000-003d8000 rw-p 00000000 00:00 0 0047e000-00488000 r-xp 00000000 08:06 3805680 /usr/lib/ruby/1.8/i686-linux/socket.so 00488000-00489000 r--p 00009000 08:06 3805680 /usr/lib/ruby/1.8/i686-linux/socket.so 00489000-0048a000 rw-p 0000a000 08:06 3805680 /usr/lib/ruby/1.8/i686-linux/socket.so 004f2000-00507000 r-xp 00000000 08:06 11403690 /lib/tls/i686/cmov/libpthread-2.11.1.so 00507000-00508000 r--p 00014000 08:06 11403690 /lib/tls/i686/cmov/libpthread-2.11.1.so 00508000-00509000 rw-p 00015000 08:06 11403690 /lib/tls/i686/cmov/libpthread-2.11.1.so 00509000-0050b000 rw-p 00000000 00:00 0 00524000-00525000 r-xp 00000000 00:00 0 [vdso] 00544000-00557000 r-xp 00000000 08:06 11403553 /lib/libz.so.1.2.3.3 00557000-00558000 r--p 00012000 08:06 11403553 /lib/libz.so.1.2.3.3 00558000-00559000 rw-p 00013000 08:06 11403553 /lib/libz.so.1.2.3.3 00639000-0063c000 r-xp 00000000 08:06 3805679 /usr/lib/ruby/1.8/i686-linux/thread.so 0063c000-0063d000 r--p 00002000 08:06 3805679 /usr/lib/ruby/1.8/i686-linux/thread.so 0063d000-0063e000 rw-p 00003000 08:06 3805679 /usr/lib/ruby/1.8/i686-linux/thread.so 00649000-0064d000 r-xp 00000000 08:06 11403714 /lib/tls/i686/cmov/libnss_dns-2.11.1.so 0064d000-0064e000 r--p 00004000 08:06 11403714 /lib/tls/i686/cmov/libnss_dns-2.11.1.so 0064e000-0064f000 rw-p 00005000 08:06 11403714 /lib/tls/i686/cmov/libnss_dns-2.11.1.so 00663000-006a3000 r-xp 00000000 08:06 4329500 /usr/lib/ruby/site_ruby/1.8/i686-linux/openssl.so 006a3000-006a4000 r--p 0003f000 08:06 4329500 /usr/lib/ruby/site_ruby/1.8/i686-linux/openssl.so 006a4000-006a5000 rw-p 00040000 08:06 4329500 /usr/lib/ruby/site_ruby/1.8/i686-linux/openssl.so 006a5000-006a6000 rw-p 00000000 00:00 0 0070d000-0070f000 r-xp 00000000 08:06 11403689 /lib/tls/i686/cmov/libdl-2.11.1.so 0070f000-00710000 r--p 00001000 08:06 11403689 /lib/tls/i686/cmov/libdl-2.11.1.so 00710000-00711000 rw-p 00002000 08:06 11403689 /lib/tls/i686/cmov/libdl-2.11.1.so 00711000-0084b000 r-xp 00000000 08:06 11403909 /lib/libcrypto.so.0.9.8 0084b000-00853000 r--p 00139000 08:06 11403909 /lib/libcrypto.so.0.9.8 00853000-00861000 rw-p 00141000 08:06 11403909 /lib/libcrypto.so.0.9.8 00861000-00864000 rw-p 00000000 00:00 0 00864000-00865000 ---p 00000000 00:00 0 00865000-00966000 rwxp 00000000 00:00 0 00977000-00979000 r-xp 00000000 08:06 11403476 /lib/libnss_mdns4_minimal.so.2 00979000-0097a000 r--p 00001000 08:06 11403476 /lib/libnss_mdns4_minimal.so.2 0097a000-0097b000 rw-p 00002000 08:06 11403476 /lib/libnss_mdns4_minimal.so.2 009fa000-00a04000 r-xp 00000000 08:06 11403691 /lib/tls/i686/cmov/libnss_files-2.11.1.so 00a04000-00a05000 r--p 00009000 08:06 11403691 /lib/tls/i686/cmov/libnss_files-2.11.1.so 00a05000-00a06000 rw-p 0000a000 08:06 11403691 /lib/tls/i686/cmov/libnss_files-2.11.1.so 00ac0000-00ac4000 r-xp 00000000 08:06 3805670 /usr/lib/ruby/1.8/i686-linux/stringio.so 00ac4000-00ac5000 r--p 00003000 08:06 3805670 /usr/lib/ruby/1.8/i686-linux/stringio.so 00ac5000-00ac6000 rw-p 00004000 08:06 3805670 /usr/lib/ruby/1.8/i686-linux/stringio.so 00af3000-00b0e000 r-xp 00000000 08:06 11403607 /lib/ld-2.11.1.so 00b0e000-00b0f000 r--p 0001a000 08:06 11403607 /lib/ld-2.11.1.so 00b0f000-00b10000 rw-p 0001b000 08:06 11403607 /lib/ld-2.11.1.so 00c35000-00c45000 r-xp 00000000 08:06 11403692 /lib/tls/i686/cmov/libresolv-2.11.1.so 00c45000-00c46000 r--p 00010000 08:06 11403692 /lib/tls/i686/cmov/libresolv-2.11.1.so 00c46000-00c47000 rw-p 00011000 08:06 11403692 /lib/tls/i686/cmov/libresolv-2.11.1.so 00c47000-00c49000 rw-p 00000000 00:00 0 00d51000-00d59000 r-xp 00000000 08:06 4329502 /usr/lib/ruby/site_ruby/1.8/i686-linux/zlib.so 00d59000-00d5a000 r--p 00007000 08:06 4329502 /usr/lib/ruby/site_ruby/1.8/i686-linux/zlib.so 00d5a000-00d5b000 rw-p 00008000 08:06 4329502 /usr/lib/ruby/site_ruby/1.8/i686-linux/zlib.so 00d60000-00d61000 r-xp 00000000 08:06 3805664 /usr/lib/ruby/1.8/i686-linux/rational.so 00d61000-00d62000 r--p 00000000 08:06 3805664 /usr/lib/ruby/1.8/i686-linux/rational.so 00d62000-00d63000 rw-p 00001000 08:06 3805664 /usr/lib/ruby/1.8/i686-linux/rational.so 00de6000-00de9000 r-xp 00000000 08:06 3805691 /usr/lib/ruby/1.8/i686-linux/digest.so 00de9000-00dea000 r--p 00002000 08:06 3805691 /usr/lib/ruby/1.8/i686-linux/digest.so 00dea000-00deb000 rw-p 00003000 08:06 3805691 /usr/lib/ruby/1.8/i686-linux/digest.so 00e63000-00e6a000 r-xp 00000000 08:06 11403700 /lib/tls/i686/cmov/librt-2.11.1.so 00e6a000-00e6b000 r--p 00006000 08:06 11403700 /lib/tls/i686/cmov/librt-2.11.1.so 00e6b000-00e6c000 rw-p 00007000 08:06 11403700 /lib/tls/i686/cmov/librt-2.11.1.so 00f70000-00fb4000 r-xp 00000000 08:06 11403907 /lib/libssl.so.0.9.8Aborted

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• XenServer: Editing clone configuration before boot

  - by Jeff Ferland

  Upon cloning a base image, I need to reconfigure basic settings. Regenerating the ssh host key, changing static IP assignments, setting the host name, etc. Because of the network setup, DHCP is not an option. That more or less rules out SSHing in with a predefined key or running a startup script since I can't provide the IP externally. I'd most like to mount the filesystem of the new machine on Dom0, but the lvm volumes are exported and it appears to be Bad Form to import them so the Dom0 machine can see them. What's your best suggestion for altering files in a cloned VM before boot? Must be non-interactive, and I'm going to guess out the gate that scripting access via xe console is not going to work well.

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• Is there a method to instantly, dynamically switch between several sets of name servers on a single domain with code?

  - by trnsfrmr

  I usually set name servers at an ISP, they often take 24 - 48 hours to resolve. If one has 2 separate sets of name servers (say from 2 domain parking companies) they want to send traffic to, is it possible to switch between the sets instantly without any delays? To be clear, how do you switch mydomain.com (ns1.nameserver1.com, ns2.nameserver1.com) to mydomain.com (ns1.nameserver2.com, ns2.nameserver2.com) instantly?

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• time sync with ntpd

  - by guthrie

  I run Debian on several systems, and their times do not seem to stay in sync. I can run ntpdate manually, but I thought that I should have an ntpd running that would automate that. I did check with apt and apt-cache but don't find any ntpd (or associated ntpq), not any such names in my system (locate...), but ntp-doc does still describe them. Looking around I see that there is an ntpdate-debian command, and it uses /etc/default/ntpdate for servers (instead of the standard /etc/ntp.conf), but even thought that file is there and has "yes" indicated to use ntp.conf, it fails with "no servers can be used", although ntpdate works fine. Is this just a layer over ntpdate, any reason to use it instead? So, why are they missing, do I need them, how do I automate time updates? Associated, two of my machines are virtualized on a MSoft VM, how is it that their clocks drift, and both to different values? (The underlying Windows machine clock seems stable). I see a few old notes about time & ntp problems on VMware, didn't find anything either current or relating to MSoft VMs. Anything I did see says just to use ntpd, but as above, ...?!

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• What benchmark tool to use to benchmark hardware for VM server?

  - by Mark0978

  We are setting up a new piece of hardware to virtualize several of our servers on. Choices are RAID 5, RAID 6, and RAID 0+1. We are wanting to benchmark all three before we go live with the machine, but I'm not sure how to test the speed. Since we will be using it to host VMs, what will the actual disk traffic look like? What can I use to see if RAID 6 is too slow? Short of setting up the system with all the VM's on it and running that way, then redoing on all the work, I'm not sure how to test it. It them becomes more of a subjective test than an objective one. I'm worried that RAID6 will have too much overhead, that RAID5 will be to fragile with 3TB drives and I've never worked with 0+1 at all. So in short I'd like to setup the base machine (which will be running Linux) and then test the underlying SW RAID for speed. What kind of tool exists to simulate this kind of load? Barring the lack of a specific tool, how about a generic FS testing tool that will simulate different loads?

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• How is virtual machine port opening works

  - by Xianlin

  I have a question regarding VM port. Say I have a Virtual Machine and a Host Machine. The opening ports on Host are 80, 22, 443 only. if I opened ports 80, 22, 443 VM it should be working. However if I opened port 21 on VM, will it work? If it works, does it mean the port 21 on Host is opened also? My understanding is that the network traffic goes from VM's virtual network adapter to Host's physical network adapter. So the ports on these 2 network adapters should match. Am I correct to say this?

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• exim configuration: 503 AUTH command used when not advertised

  - by jrdioko

  I'm running a piece of software on a Windows server that sends email notifications via a remote SMTP server. It has very few configuration options, and only supports basic SMTP authentication without SSL/TLS. I have exim4 running on a Debian server that will be the SMTP server for this Windows program. It is set up with default configuration, plus allowing AUTH PLAIN and AUTH LOGIN unencrypted connections. I have successfully sent an email over telnet: telnet servername 25 ehlo test 250-AUTH PLAIN LOGIN ... auth plain XXX 235 Authentication succeeded mail from: ... ... However, the program I want to connect to this server fails to connect. To see why, I ran a packet sniffer during the connection, and see the following session: C: HELO hostname S: 250 Hello hostname C: AUTH LOGIN XXX | XXX S: 503 AUTH command used when not advertised | 500 unrecognized command C: QUIT S: 221 closing connection I'm not familiar enough with the SMTP protocol to understand what's going on here. What do I need to change on my exim4 SMTP server to allow for this connection to be made?

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• Folder redirection save times are awful slow

  - by wbmeu

  I recently set up folder redirection for Documents on Server 2008, but it's painfully slow at the moment. My users are all using Visual Studio 2010, and a save takes 20-30 seconds (whereas it used to take 2 seconds locally). I understand this is because they are being saved to the server, and that takes time (though I did think it would be faster over a gigabit link, with servers on the same network). I enabled offline files on the share, set the option to All files or folders, and enabled Optimize for performance. I thought that this would pull all the files down locally (which I think it did), allow local editing of said files, synchronizing them quietly in the background from time to time (which it does not do - saves right to the share). Is there any way I can speed this process up a bit? Any other tweaks I can do?

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