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• PostgreSQL 9.1 Database Replication Between Two Production Environments with Load Balancer

  - by littleK

  I'm investigating different solutions for database replication between two PostgreSQL 9.1 databases. The setup will include two production servers on the cloud (Amazon EC2 X-Large Instances), with an elastic load balancer. What is the typical database implementation for for this type of setup? A master-master replication (with Bucardo or rubyrep)? Or perhaps use only one shared database between the two environments, with a shared disk failover? I've been getting some ideas from http://www.postgresql.org/docs/9.0/static/different-replication-solutions.html. Since I don't have a lot of experience in database replication, I figured I would ask the experts. What would you recommend for the described setup?

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• lsass.exe memory leak on windows 2003 server

  - by thelsdj

  In the past month or so I noticed that lsass.exe has started to leak memory, getting to 500MB+ of ram in under a week after reboot. Before this I had never noticed it using any significant amount of memory compared to other processes on the system. This is happening on 2 identical servers, neither of which has anything to do with Active Directory. Maybe a recent Windows Update has caused this? Any thoughts on things to check? As a side question is there some way to recycle the memory usage of lsass.exe without rebooting? Edit: Here is what I'm seeing in Process Monitor, there are thousands of registry open/query/close a minute from lsass.exe. How can I track down what is triggering these?

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• What is the fastest MD5 sum calculator?

  - by netvope

  I tested the speed of md5sum on a few Ubuntu 8.04 servers Pentium III 700 MHz: 52 MB/s Atom 1.6 GHz, 32-bit: 119 MB/s Core 2 (Yorkfield) 2.5GHz, 32-bit: 194 MB/s Core 2 (Yorkfield) 2.5GHz, 64-bit: 222 MB/s Then I downloaded a tool (by apt-get install) called md5deep and found that it's roughly 20% faster (as tested on the 32-bit Core 2 server). This makes me feel that the "vanilla" md5sum included in Ubuntu isn't the fastest one. Questions: Other than md5deep, are you aware of any MD5 calculators that are potentially faster than md5sum? (Answers for software from other OS are also welcomed.) If I want to compile md5sum myself, where can I download the source? What compiler options would you suggest for the Core 2 server? (note: gcc 4.2.4 in Ubuntu 8.04 does not seem to support -march=core2)

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• Setting up Zend Framework 2 on GoDaddy

  - by Yossi

  I tried setting up ZF2 on the GoDaddy shared servers, though it doesn't work. I tried to download it directly, and using the git composer (which I managed to install successfully on the server). The error I'm receiving from PHP is this: Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /home/content/82/5123082/html/tmp/ZendSkeletonApplication/public/index.php on line 12 Parse error: syntax error, unexpected T_STRING in /home/content/82/5123082/html/tmp/ZendSkeletonApplication/public/index.php on line 12 The PHP version the account is running: PHP 5.3.13 (cli) (built: May 14 2012 16:26 The Linux server that is used is: Linux ...secureserver.net ... #1 SMP Fri Jul 15 08:15:44 EDT 2011 i686 i686 i386 GNU/Linux CentOS release 5.5 (Final) Any ideas what I'm doing wrong? I never worked with ZF1, and I know there are custom solution out there for ZF1, but I didn't manage to port them into ZF2.

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• kmemsize problems in VPS even when there is about 500MB free mem

  - by Amer

  Hello, I have a site hosted on a Plesk VPS with 512MB memory and keep on getting kmemsize in "black zone" QoS errors. The soft limit of kmemsize is 12,288,832 and hard limit is 13,517,715. The definition Virtuozzo gives is: Size of unswappable memory, allocated by the operating system kernel. What's eating up the kmemsize? Is there any way to reconfigure and increase the kmemsize? The servers barely have any load or processing. Thanks for the help...

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• SSH - using keys works, but not in a script

  - by Garfonzo

  I'm kind of confused, I have set up public keys between two servers and it works great, sort of. It only works if I ssh manually from a terminal. When I put the ssh command into a python script, it asks me for a password to login. The script is using rsync to sync up a directory from one server to the other. manual ssh command that works, no password prompt, automatic login: ssh -p 1234 [email protected] In the Python script: rsync --ignore-existing --delete --stats --progress -rp -e "ssh -p 1234" [email protected]:/directory/ /other/directory/ What gives? (obviously, ssh details are fake)

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• Migrating 2008 AD to Windows SBS 2011 and Forefront TMG 2010

  - by Tong Wang

  Our company has two physical servers: a Dell R710 with 4 NIC and a Dell R410 with 2 NIC. Right now, we have Windows server 2008 R2 installed on R710 with AD setup to host our domain. I am thinking to install both SBS 2011 and TMG 2010 on the other R410 running on Hyper-V. As I am fairly new to Windows Server technology, I'd like to check with you fellow Windows admins and see what is the proper way to install SBS 2011 and TMG 2010 and how to migrate the 2008 AD. Your advice and help will be highly appreciated.

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• Win7-Server2008 RDP connection hangs on "Securing Remote Connection" for 20-30 seconds

  - by JohannesH

  I have a problem that googling has turned up nothing, except this question on experts exchange which I borrowed most of the text from. :) When I connect via Remote Desktop to a new Windows 2008 R2 server it takes 20-30s to get past the "Securing Remote Connection" message during the login. If the password is wrong, it does this every time you attempt a login (ie its not a one time thing). However, after a successful login attempt the following logins to the same server goes faster. Most servers runs on VMware here, but I don't know if that has anything to do with it.

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• /var/run/httpd.pid missing...

  - by user38043

  Recently one of our web servers httpd stopped working and I haven't been able to find the problem. Today I sat down and went through every directory in the httpd.conf and have found an issue. the /var/run/httpd.pid is missing from the folder. All other files are there and seem to be fine. I cannot create a new file with the same name in vi and I have no idea what could have caused this. I imagine it was caused by a cold reboot at some stage as no other extraordinary processes have been run on this server at the time it went down. I am running CentOS 3. How can I reinstate this file?

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• Restart Fibre channel controller after blade bootup IBM HS bladecentre

  - by Spence

  I have a remote system that needs to resume on startup. If the system is simply powered on then the blades boot before the SAN is online and then the only thing you can do is restart the systems. Is it possible to restart the fibre channel controller? That way I could have a system restart the controller after boot, connect to the SAN and then restart all servers requiring SAN information? Please note that I'm not a sys admin, just shooting for ideas to get a clean startup to work, apologies if my terminology is wrong.

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• OSSIM - Snort/OSSEC/Nagios Logging Config Question

  - by Eric

  Quick n00b OSSIM question. I've looked around but haven't found exactly what I'm looking for. I currently have a Nagios, OSSEC, Nessus, and Snort server and I want to keep those servers active but just ship the logs to the OSSIM server and have it do the correlating and graphing. Can that be done? Everything I've seen is putting the various software functions actually on the OSSIM box but I don't want to do that. I'm running CentOS on all of the systems. Thanks.

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• IPcop Multiple WAN Subnets

  - by obsidian

  We have an IPcop firewall and have had no issues with it. We've had a block of 10 IP addresses from our colocation provider and have been able port forward from those to internal servers as needed. We've recently needed additional IPs and the colocation provider issued an additional block of 10. The problem: The 10 new IP addresses issued are in a different subnet with a different gateway. The question: How do I add the new gateway into IPcop? How do I make it so that any outbound traffic in response to any inbound traffic from a new IP go back out through the new gateway? I attempted to add a static route via the console using the following command: route add -net x.x.x.x gw x.x.x.x netmask 255.255.255.192 I also added the new IPs as aliases and setup port forwarding as I've done with the existing IP block. However, when I attempt to access a web server from an external workstation, it just times out. Thanks in advance for your assistance.

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• Using a secondary DNS when lookup fails in primary? [migrated]

  - by Huckle

  I use a VPN to connect my development machine to my school's CS dept. The development machine is Ubuntu as we do C programming in Unix. I used vpnc to do that. The school uses some DNS entries that only resolve on their DNS servers, i.e., internalserver.csdept.school.edu I am normally attached to the VPN whenever booted for convenience. However I noticed the other day that when I disconnect the VPN all my DNS queries fail. This obviously means that vpnc set up the school's DNS to be used. However I'd rather not use their DNS all the time (tracking and privacy and whatnot). Is there a way I can restore my ISP's DNS and then if the lookup fails, have it use my school's DNS?

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• BIND authoritative name server: SERVFAIL?

  - by Luca Tettamanti

  I have a BIND 9.6 instance that acts as a caching NS for the whole building and is also authoritative for an internal zone ("example" below): zone "example" { type master; file "example"; update-policy { grant dhcp-update subdomain example. A TXT; }; }; Due to a rogue switch we lost connectivity with the rest of the world, and the NS started answering SERVFAIL; what surprised me was that the server was also unable to respond to queries for the example domain. What is the reason of this behavior? Shouldn't the NS be able to answer since it has authoritative data? edit: The rest of the configuration is the standard one shipped with Debian: hints for the root servers and the zones for localhost and broadcast.

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• How to customize email FROM header with an email from a different domain ?

  - by user40763

  How can I customize the mail FROM header in our Email Marketing Application , to enable our customers to specify their OWN email ( from their domain ) . Currently the customer specify his own domain and we use it at the Reply-To mail's header. CURRENTLY From: [email protected] Reply-To: customer_email@customer_domain.com Return-Path: [email protected] WHAT WE NEED From: customer_email@customer_domain.com Reply-To: customer_email@customer_domain.com Return-Path: [email protected] We do it this way to avoid getting blacklisted because Mail Servers like Gmail or Hotmail would considers it as a MAIL'S HEADER FORGERY ATTEMPT. But our customers keeps asking us to make the FROM HEADER customizable. Can someone help us ?

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• Mail server responds with Error 500 line too long

  - by mawimawi

  I am occasionally receiving error messages from mail servers with the above message. It seems that at least one line in the e-mail has more than 999 characters and therefore the e-mail is bounced. Is this "by design"? in an RFC? Or some weird pseudo-spam-filter? Or just a bad mailserver? I googled around a bit but did not find a competent answer. Hopefully one of you guys can enlighten me.

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• Crontab script on Mac OS X Lion does not work anymore

  - by Nopster

  I have a problem with cron tasks. Previously this script worked fine on Mac OS X 10.6 server, but when I initialize it on Lion (client), this script stopped working. Basically, this .bat file calls a jar file (that invokes a loop of mysqldump commands) to backup several databases on several servers, and runs perfectly if launched by the shell. cd /Users/nameoftheuser/Desktop/backupper /usr/bin/java -cp .:Backupper.jar:lib/mail.jar backupper.Main "/Users/nameoftheuser/Desktop/backupper/listasiti.txt" "/Users/nameofthe/Desktop/backupper/config.properties But if the cron launches the same .bat file, the generated database backups are 0 bytes. The cron entry is: 0 0 sh /Users/path/to/file.bat I believe that the problem is that cron doesn't run as root. Or what else?

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• Make My Own Made Java Based Text editor as default Text Editor in Windows

  - by Rohan Sharma

  I have Made a Text Editor in Java and i want to make it default text editor ,That is like in windows we have notepad as default text whose icon shows on all text files and double clicking those file(s) opens the file(s) in notepad window.. I Want to achieve same Task of Making my texte editor as default one...but only right clicking a text file and selecting my text editor as default app for opening text files do not servers the purpose,Because my text editor will not accept the file input that way,its made to accept the file input only by FileChooser...so Is There any library in java to achieve that task Of Accepting The File Input That way???

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• What's required to configure Ubuntu to use a specific DNS server?

  - by ks78

  I've setup two Amazon EC2 instances, both running Ubuntu Server. One is configured as a DNS server running bind9, which will be used to allow EC2 instances to communicate with each other based on hostname rather than IP, since their private IPs may change. I think I have the DNS server setup correctly. I want to use the second EC2 instance to test the DNS server. Using Webmin, I've added the DNS server's private IP to the client's DNS Servers list and added the domain to the Search Domains list. I did have to edit /etc/dhcp3/dhclint.conf to make my changes stick. After reboot, I expected I'd be able to ping or nslookup the DNS server from the test client, but it can't seem to find the server. Is there something I'm missing? What's required to configure an Ubuntu client to use a DNS server? I just want to make sure I'm not missing something before I assume the server's the problem.

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• Differencing Disks in VirtualBox

  - by PhilPursglove

  I'm struggling to understand how to do differencing disks in VirtualBox v3.1.0. I've created a Windows 2008 Server, but now I want to use that as a base image for a number of other servers. The help file has a description of what differencing disks are, but I can't find where it actually tells you how to do it. In the Storage dialog for a server I found the Differencing Disks checkbox: but when I check it, I'd expect it to then ask which image should be the parent so I could select my base image. Any pointers you can offer would be greatly appreciated!

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• How do I calculate the amount of tuning needed for my server ?

  - by Low Kian Seong

  I have a server which is running a few discrete Python, Java application which most of the time imports data into a PostGreSQL database. I would like to know from people out there who have experience tuning enterprise grade servers how do i go about calculating in a holistic way the amount of tuning needed for my server for example vm.swappiness, vm.overcommit_ratio and other numerical tunings needed for my server. I tried to enable sar on my server to capture daily numbers but these are more along the lines of total numbers and I can't figure out how to allocate memory for my applications. Help would be appreciated. Thanks.

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• Colocation near EC2

  - by brianreavis

  Does anyone know any colocation providers near the Amazon's US EC2 facility(ies)? I'm needing to colocate a couple servers that need to be able to connect with EC2 with the lowest latency possible. I can't even find where their facilities are... Any ideas of the best solution or places to start looking? (ps. I'm well aware that EC2 instances can be configured to do pretty much anything. I have a special need that can't be deployed to EC2.)

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• Set iDRAC IP Address on Ubuntu 12.04 without Reboot?

  - by BT643

  We have a Dell PowerEdge R720XD server and want to setup iDRAC, but this is a production server so we need to do it without a reboot if possible. We just need to set the IP address on the iDRAC but the servers do not have a front LCD panel so we cannot use this. The iDRAC will currently have the default 192.168.0.120 IP address but we are not on this IP range so cannot use this. We need to change it to 192.168.5.x. I've seen racadm mentioned, but before I start messing around installing this on Ubuntu, is this what we need? and will we be able to set the IP address on the DRAC with this? Thanks

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• How do I change the number of days a copied transaction log is kept in a log shipping configuration?

  - by Decker

  I think this is a pretty simple and perhaps stupid question. I've established log shipping between two SQL Server 2008 servers using the GUI (i.e. the SQL Server Management Studio). It's been running fine -- but now I want to change the number of days the copied files are retained on the secondary server. Is it simply a matter of going back to the GUI and change it there. Is it smart enough just to make that simple change or is the GUI only used to create the initial log shipping configuration?

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• Apache mpm-itk Performance

  - by Matt Beckman

  I manage a bunch of VPSs with memory ranging from 1GB to 8GB. Most of these websites are Joomla websites, and the servers must support multiple sites/users/S-FTP. I use mpm-itk almost exclusively (mostly due to it's convenience in these shared environments). However, I'm aware it isn't known for performance, so I need some advice on making it faster. Due to the lack of documentation when I first went the way of mpm-itk, I included only one setting in the config, and that was to limit each user to 50 clients (the rest I left up to defaults): <IfModule mpm_itk_module> MaxClientsVHost 50 </IfModule> Are there any better alternatives available? Are there any settings supported in mpm-prefork or mpm-worker that are also supported in mpm-itk? Thanks!

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