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• Linux : Forward users mail using exim4 server (newbiw warning)

  - by llazzaro

  Hello, I have a network of linux server, one of them is running exim4 that server could send [email protected]. At exim4 server, I had setup an alias for the users accounts ...for example root : [email protected] But I have other server, if I put the alias email is marked as spam...since they arent using exim4 server. I want to configure the other server to use that exim4 server, in order to dont get the mails mark as spam. Well I know this is really newbie question, but searching at google is difficult since it confuses exim4 server configuration than the client configuration to use exim4 server. Remember, I want root@server1,root@server2,etc mails send via exim4 server!

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• Need help connecting to NAS externally-port forwarding and DDNS newbie

  - by Joel

  Hi folks, I just picked up a synology NAS, and I'm loving it for internal use, but I want to be able to access the NAS externally-both from my iPhone (3G) and from the net. I have a Linksys WRT54G-TM router. My first question is whether I have set up the dyndns correctly. On my computer that is on my network, if I put in mydomain.dyndns.org, I am taken to a password popup and when I enter my router login and password, my router admin page opens up. On the same computer, I get the same results if I use my external IP address, and if I use my internal IP 192.168.0.1 So that is all as expected. However, when I go to my iphone and turn off wifi, and try to connect with 3g to the external IP or the dnydns domain, I just get an error "Safari could not open the page because the server stopped responding". What's up?

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• Dedicated NIC or dedicated port for iSCSI?

  - by Newt

  When spec'ing and configuring a machine that will utilise shared iSCSI storage, I've read a lot of documentation which suggests a dedicated network adapter should be used for iSCSI communication. That makes a lot of sense and I have no problem with it. The question I do have, is this - should that suggestion be taken to mean that a separate physical NIC should be used, or will a dedicated port/ports on a dual/quad port NIC be just as good? My suspicion is that simply using dedicated port(s) on a shared NIC would be just as good. Any input greatly appreciated.

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• VMWare ESX Updates - Which to Apply?

  - by Aaron Alton

  Wondering what more experienced ESX admins typically do... I just brought our ESX hosts up to 3.5 Update 5 (Yes, I know we're behind still). I then applied the "Critical Host Updates" baseline in VMWare update manager, and found that we're still short on 14 "critical updates". My question is, do most people go ahead and apply any update flagged as critical, or do they evaluate each update one-by-one to determine whether or not the issue that has been addressed is likely to affect them. In the SQL Server world (my alma mater, so to speak), we regularly apply service packs, and sometimes cumulative updates, but we only apply hotfixes when the issue that they are targeted towards affects us. Does the same logic hold fast in VMWare land?

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• Solarwinds SDK/customisation

  - by Shane

  Hi, Sorry if this is the wrong place to post, but it is a hybrid serverfault/stackoverflow question. I've been directed to take a look at Solarwinds, which is an excellent network monitoring solution, for an internal project. Basically we want to write our own panel to display information custom to our network infrastructure. Has anyone done anything like this, or know if there is a plugin SDK giving developer access? [edit:] Also, if anyone knows of any other Solarwinds-type open source network solutions, please let me know. Cheers, Shane

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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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• DNS Help (CNAMEs and A Records)

  - by Aaron Francis

  I'm trying to set up my DNS properly so that I can have hosting through PHPFog and email services using MailGun. PHPFog has us redirect the naked domain to the www and then use a CNAME to point the www to PHPFog and mailgun provides the MX records to use. The problem I'm having is that I have no A record set up on Hover because when I do, the CNAME no longer works (?), or at least it seems that way because I am no longer seeing my site from PHPFog, I'm seeing a Hover landing page. I know all the records I need, I just can't seem to get them to play nicely together. I've been told Amazon's Route 53 should be able to solve my problem, but I haven't yet figured out how. I just need to have hosting at PHPFog and email services through MailGun. As you can probably tell, I have only a very limited understanding of DNS, so forgive me if this is a silly question.

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• Brainstorm: Flood/DoS/DDoS Attack prevention ideas.

  - by Gnarly

  This is not a question asking how to stop an attack. This is simply a thread for anyone and everyone to discuss ideas for preventing, dealing with, and keeping your server alive during these attacks. Do not discuss using 3rd party software, this is a place to make your own ideas and read others. Post examples if you'd like. Post ideas how to filter out flood attacks. Post ideas how to keep your server alive while being under a heavy DDoS attack.

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• Website pages very slow to load on first access

  - by Merianos Nikos

  I have a production web server that makes sites to be very slow when load for first time. After the first time all connections are normal and fast. In the following screen you can see the first test I have run for a random site in my server: and here you can see the result of the second time request: As you can see there is a big change in the second load of the same page. Here is the page load time graph: My problem is that I don't really know anything about Red Had Linux server, and also I don't know where can I start. Can somebody to help me ? I like to find out the solution for the long time "wait" in connection. I know that my question is very minimal, but you can always ask me to give you information about the server.

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• Justifying a memory upgrade

  - by AngryHacker

  My employer has over a thousand servers (running SQL Server 2005 x64 and a couple of other apps) all across the country. And in my opinion they are all massively underpowered for what they need to do. Specifically, I feel that the servers simply do not have enough RAM for the amount of volume the machines are asked to do. All the servers currently have 6GB of RAM. The users are pretty much always complaining about performance (mostly because, immo, the server dips into the paging file quite often). I finally convinced the powers that be to at least try out a memory upgrade on one box and see the results. However, they want before and after metrics, so that they can see that the expense will be justified. My question is what metrics should I collect to see whether the performance truly improves on the box? I am a dev, so I am not sure how and what to collect (i have a passing knowledge of Perfmon).

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• scalability with nginx, passenger, ruby on rails setup

  - by Dani Cela

  Hey guys I had a question regarding scalability for my RoR application. We have been optimizing our application over the last few days and after running blitz.io, notice that our application times out after maybe 1000 hits in 30 seconds we experienced massive timeouts. In the 1 minute test apparently 74% of users would have timed out. Look at the performance of my website: http://blitz.io/report/1c8eb2f395a5eadeabd62fd831ada9e5 Not saying that our website will in any way experience this now, but I wish to design the infrastructure to handle this. What is normally done in this situation? Currently we have one web server and one database server. Would load balancing be the route to go?

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• Zantaz's EAS exchange archive product doesn't integrate with Outlook in Windows 7

  - by Chris Farmer

  I work at a place that uses Exchange with Outlook for mail, and they also use a product from Zantaz called "EAS" which does server-side archiving of old messages. One of the artifacts of this archival is that email attachments are missing from the archived messages when viewed in Outlook. EAS has a client tool that plugs into Outlook that enables easy retrieval of those archived messages and their attachments, but it doesn't seem to work when installed on Windows 7. I have no direct evidence of this, other than that it simply doesn't work on my Windows 7 machine, and some of our network support staff seem to corroborate this. The symptom is that Outlook seems to know nothing of the existence of this EAS app. The EAS app also has a system tray icon which is there and offers some minimal functionality, but the real goodness is the Outlook integration, which I sorely miss. So, my question is this: does anyone here know whether it's possible to coerce this EAS product into working correctly in Windows 7?

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• Hard disk problem pop up warning

  - by Leonardo

  I'm using windows 7 ultimate and it started to give me this hard disk problem warning that i had before in another OS that made me disable smart, it has been over a year since i did and my pc is running ok so my HDD is ok. all i wanna do is disable this warning that popsup while i'm gaming or doing anything else. thanks for your help :) Edit: (adding in info that was added as an answer instead of part of the question) So it's me again and i agree with both answers but i don't have the money right now to buy a new one, and yeah it could die now, i can't say. so i uploaded an image of hd tune pro scan on my HDD thanks again! anymore information would be even better, bye.

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• SCSI direct-access device appears as multiple lun's

  - by unixdj

  I have a similarly described problem to this question: http://superuser.com/questions/90181/same-scsi-drive-appears-multiple-times-on-the-controller-list where a SCSI direct-access device appears as multiple lun's, when it should only be one. The device is a SCSI-1 device, the SCSI controller card is an Adaptec AHA-7850 (rev 03), and system is PC / Linux 2.6. This device worked fine with RHEL4, and appeared as a single device / lun when the OS booted, but I've just tried plugging the device into a newer Linux disto (CentOS 5.4) and it now sees the device as 8 luns; with consequently 8 device files /dev/sgb to /dev/sgi. Any clues of how to figure out where the problem / fix is, would be great.

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• Feedback request: Linode for Magento hosting?

  - by Ernest

  Hello, i install and customize a self made application for web pages which uses spring+jstl and the admin uses flex. Also i want to add to my offers an ecommerce cms, so i have decided to start with magento. I'm using daily razor vps, however i was thinking in switching to linode because of the price. My questions are: 1.- Is linode good for magento ? 2.- is linode good for java+tomcat+jstl+mysql apps ? 3.- What are the most demanding resources to magento ? CPU ? RAM ? Does it consumes more if i have more products? Well i hope to learn from you, this page is always so helpful UPDATE: A final question: 4.- Do you recomend another vps service for my requieriments ?

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• IPv6 local address in hosts file

  - by Dan

  I have set up a local domain on my Apache server. Then I added the following line in my /etc/hosts file ::1 exampledomain.local After I trying to navigate to it, (I tried Firefox and Chromium) I got a server not found error. Then I tried ping6 and it worked: dan@danny:~$ ping6 exampledomain.local PING exampledomain.local(exampledomain.local) 56 data bytes 64 bytes from exampledomain.local: icmp_seq=1 ttl=64 time=0.032 ms If I replace ::1 with 127.0.0.1 in my hosts file, it works fine. I'm not sure if this is relevant but this is my Virtual Host configuration in Apache2: <VirtualHost *:80> ServerAlias exampledomain.local DocumentRoot /home/dan/sites/exampledomain <Directory /home/dan/sites/exampledomain> Options Indexes FollowSymLinks MultiViews AllowOverride All Order allow,deny allow from all </Directory> ErrorLog ${APACHE_LOG_DIR}/exampledomain-error.log # Possible values include: debug, info, notice, warn, error, crit, # alert, emerg. LogLevel debug CustomLog ${APACHE_LOG_DIR}/exampledomain-access.log combined </VirtualHost> My question is: How can I make it work with the IPv6 address?

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• Windows Vista/7: Managing multiple audio playback devices

  - by BrianLy

  I've got speakers (audio in) and headphones (USB headset with it's own soundcard) connected to my desktop computer. Under Windows 7, I can right-click the Audio Mixer and select Playback Devices and toggle between my these devices. Is there an easier way, perhaps a keyboard shortcut, that would make it easier to toggle? I'm working in an shared space were sometimes I want headphones to avoid annoying other people, but at other times speakers are OK. I want to be able to toggle quickly. In an ideal world, the solution to my question would work in Vista too.

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• How does one calculate voltages for overclocking?

  - by TardisGuy

  So, all I know is voltage and clock have something to do with each other. Unstable if too low voltage Too high voltage, and too much heat. or higher voltage + lower clock may heat less than that voltage at higher clock. The reason why im asking is because if I can learn how the power vs speed works, Then i might be able to project some kind of thermal curve to find out where my perfect overclock might be (without 50 burn-ins) But, as is apparent im sure. I have no idea what im talking about. If anyone can help me learn more about this; throw me a page, a macro, whathaveyou I will bow before your awesomeness and... Mail you a phantom hand written thank you letter. Some clarification Rev 1 What im trying to learn: is how much power a cpu is using with measurements (Core Voltage) vs (Clock speed) - It would answer the question: Would a 1.4v core @ 4.0Ghz use as much power as a 1.4v core @ 3.0Ghz?

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• Amazon ec2 - WildCard Sub-Domain

  - by Sharanc25

  I'm running an ec2 instance on ubuntu running lamp stack. I configured my httpd.conf file to support wildcard sub-domain but it didn't work. My httpd.conf file NameVirtualHost * <VirtualHost *> DocumentRoot /www/example ServerName example.com ServerAlias *.example.com </VirtualHost> I tried all possible solutions but they didn't work. Finally I used amazon Route-53 to setup a wildcard DNS to redirect all *.example.com to example.com. My question is, Is it okay if I use Route-53 instead of httpd.conf file for wildcard Sub-Domain ? Is there an error in my httpd.conf file ? (Note: I used the same httpd.conf settings with another hosting provider and it worked perfectly there.) Additional Information : VirtualHost configuration: wildcard NameVirtualHosts and _default_ servers: *:80 is a NameVirtualHost default server example.com (/etc/apache2/httpd.conf:1) port 80 namevhost example.com (/etc/apache2/httpd.conf:1) port 80 namevhost ip-xx-xxx-xx-xxx.ec2.internal (/etc/apache2/sites-enabled/000-default:1) Syntax OK

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• How do I get a hold of the Reply-To header and remunge it in postfix

  - by Mikhail

  I have a legacy application that emails via php. 5% of the emails aren't going through. The solution is to route all email through a fancy verified mail server like Amazon's SES. I am having some trouble implementing this functionality. It seems this guy had a similar problem. My question is where in postfix can I set a filter that will take as input the the message headers, so that I can manually set the From field and the Reply-To field to [email protected] and [email protected], respectively. Where whatever_php_wants is dictated by the php program and the users registration email. I know where to set the noreply portion, but I don't know the exact place in postfix's configuration files where I can intercept complete emails and pass them to a script. Edit So I want emails to look like: FROM: [email protected] REPLY-TO: the_users_address@their_email_service.com

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• Searching for a specific option in a man page

  - by mitch_feaster

  I often find myself man'ing a command just to learn about one specific option. Most of the time I can search to the option just fine, unless it's something like ffmpeg or gcc where I have to step through about 40 matches until I get to the actual description of the option... Sometimes I can get lucky and search for the word "options" to get close and then refine it from there, but it would be nice if I could reliably jump straight to the option in question. It would be cool if there was a tool that could parse out the options and build a database on which you could do searches, but after looking at the groff markup for a few pages I've determined it would only be a best-guess effort due to the lack of meta-information in groff markup... In my ideal world woman mode in emacs would support searching for specific options... :) Any tips for jumping straight to a specific option in a man page?

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• What is the difference betweeen "Network install" and "Network Boot" options in virt-manager when installing a new virtual machine

  - by Marwan

  From my understanding of PXE (Preboot Execution Environment), I know that there must be some negotiation first between the booting client and a DHCP server to obtain network parameters (IP address, etc) in order for the client to be able to fetch the boot loader and kernel image from the boot server. In other words, and aside from being a "virtual" machine, we're talking here about a "bare metal" machine, so there must be some "pre boot" mechanism for those negotiations to take place, and this is exactly what PXE is all about. When I think about the "Network install" option, I can't figure out how the new VM would be able to fetch the boot images (bootloader and kernel) without the previously mentioned mechanism. So, here is a short version of the question: When provisioning a new virtul machine, how do you expect the "Network install" option in virt-manager to work behind the scenes? Many thanks.

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• Cannot resize OS X partition

  - by David Pearce

  I am trying to resize my existing Mac OS Extended partition on my Macbook to install Windows 7 (using steps similar to these), but when ever I go to apply the changes, I get this error: Partition failed Partition failed with the error: The partition cannot be resized. Try reducing the amount of change in the size of the partition. The total capacity of the hard drive in question is 260GB, with the entirety being taken up by the OS X boot partition. There is I am aiming to shrink that partition down to 60GB. How can I fix this problem? I have been reducing the amount of change by 10GB each attempt, but it still is not working. I assume the problem is that there is not a large amount of continuous space on the device. Is there some way to can do a manual defrag that would rectify this problem?

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• How can I limit my data usage over tethering on Windows?

  - by Casebash

  The excess data charges if I go over my tethering data limit are ridiculously. Fennec already stated the question well. Because of this, and on general principle, I'd like to have some tools which permit me to do things like: Monitor the amount of bandwidth that I've used I think I can do this from Sprint too, but on-the-computer is nice too on-the-computer gives me a possibility of breaking it down by application See what sort of programs are using the Internet connection I could use, like, Wireshark, but that's a bit too micro-level to be practical Keep those programs, and the operating system, from doing things like "downloading an operating system update" while on the mobile hotspot Related I want to monitor and limit OS X's data transfer while I'm tethering via my iPhone

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• Revocation status of DC can't be verified

  - by DotGeorge

  A Domain Controller within my forest was working fine (as the story usually goes). Then, suddenly, I can't logon with my smart card. Instead, I'm greeted with the following message: The system could not log you on. The revocation status of the domain controller certificate used for smart card authentication could not be determined. I literally have no idea what's happened here. As an attempted quick fix, I removed the root certificate which issued the Smart Card's certificate from the CA of both the client and DC. Then imported a newly exported one from the DC in question. Same issue. I've spotted a number of related articles on Microsoft's forums and a HP support document. Each don't really shed much light as it's a generic error message apparently. Having said all of this, other smart cards (issued from other DCs) work fine. So I have no idea what's up with this one.

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