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• When using TCP load balancing with HAProxy, does all outbound traffic flow through the LB?

  - by user122875

  I am setting up an app to be hosted using VMs(probably amazon, but that is not set in stone) which will require both HTTP load balancing and load balancing a large number(50k or so if possible) of persistant TCP connections. The amount of data is not all that high, but updates are frequent. Right now I am evaluating load balancers and am a bit confused about the architecture of HAProxy. If I use HAProxy to balance the TCP connections, will all the resulting traffic have to flow through the load balancer? If so, would another solution(such as LVS or even nginx_tcp_proxy_module) be a better fit?

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• Server 2012, Jumbo Frames - should I expect problems?

  - by TomTom

  Ok, this sound might stupid - but is there any negative on just enabling jumbo frames in practice? From what I understand: Any switch or ethernet adapter that sees a jumbo frame it can not handle will just drop it. TCP is not a problem as max frame size is negotiated in the setinuo phase. UCP is a theoretical problem as a server may just send a LARGE UDP packet that gets dropped on the way. Practically though, as UDP is packet based, I do not really think any software WOULD send a UDP packet larger than 1500 bytes net without app level configuration changes - at least this is how I do my programming, as it is quite hard to get a decent MTU size for that without testing yourself, so you fall back in programming to max 1500 packets. The network in question is a standard small business network - we upgraded now from a non managed 24 port switch to a 52 port switch with 4 10g ports (netgear - quite cheap) and will mov a file server to 10g for also ISCSI serving. All my equipment on the Ethernet level can handle minimum 9000 bytes and due to local firewalls I really want to get packets larger (less firewall processing), but the network is also NAT'ed to the internet. On top, different machines move around (download) large files (multi gigabyte area) quite often for processing. The question is - can I expect problems when I just enable jumbo frames? Again, this is not totally ignorance - I just don't see programs sending more than 1500 byte UDP packets (if that is a practical problem please tell me) and for TCP the MTU is negotiated anyway. if there is a problem I can move to a dedicated VLAN, but this has it's own shares of problems as basically most workstations must then be on both VLAN's.

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• How soon does nginx's token bucket replenish when limiting at requests per minute?

  - by Michael Gorsuch

  Hi all. We've decided that we want to experiment and limit requests per minute instead of requests per second on our sites. However, I am confused by the burst parameter in this context. I am under the impression that when you use the 'nodelay' flag, the rate limiting facility acts like a token bucket instead of a leaky bucket. That being the case, the bucket size is equal to the burst parameter, and every time that you violate the policy (say 1 req/s), you have to put a token in the bucket. Once the bucket is full (being equal to the burst setting), you are given a 503 error page. I am also under the impression that once a violator stops going against the policy, a token is removed from the bucket at a rate of 1 token/s allowing him to regain access to the site. Assuming that I have the above correct, my question is what happens when I start regulating access per minute? If we chose 60 requests per minute, at what rate does the token bucket replenish?

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• what kind of memory can be categorized as Modified Memory in Resource Monitor

  - by Kavin

  In Windows 7 and Windows 2008 R2, there is a new Resource Monitor that is very useful and powerful to monitor the system. In the Memory section, I see a section called Modified (orange) The official description is: Memory whose contents must be to disk before it can be used for another purpose. But I am still confused. What kinds of memory is Modified? In which case can we say that this number of memory is Modified? Can anyone give me a specific example? Is the following guess correct? When a program want to write something into disk, it actually write the content to an IO buffer, which is in the memory. After OS flush this area of memory into disk, the memory is modified or standby?

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• Can I make the Courier email server use a non-default salt for passwords?

  - by Vasiliy Stavenko

  I'm setting up email server for the first time and confused with strange thing. I have several user accounts which stored in previous server. Passwords for this accounts are in plain text. But I want to create crypts for them. MySQL (where my users will be stored) have function encrypt(passwd, salt). If no salt given used random value. I discovered that Courier uses one certain salt and crypted all passwords with it. So the task done. But I'd like to know if there's a way to define my own salt for my pop3 server?

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• Can I make the Courier email server use a non-default salt for passwords?

  - by Vasiliy Stavenko

  I'm setting up email server for the first time and confused with strange thing. I have several user accounts which stored in previous server. Passwords for this accounts are in plain text. But I want to create crypts for them. MySQL (where my users will be stored) have function encrypt(passwd, salt). If no salt given used random value. I discovered that Courier uses one certain salt and crypted all passwords with it. So the task done. But I'd like to know if there's a way to define my own salt for my pop3 server?

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• Outlook 2010 exchange setup prompts for [email protected] rather than [email protected]

  - by Force Flow

  We use a hosted exchange service. When users want to set up Outlook 2010 to access their account, they open Outlook and run through the configuration steps. Autodiscover is enabled, and in the user's active directory profile, their email address is in the email field. However, when the configuration process reaches a point where they are prompted for their email account's username and password, their active directory username is filled in by default instead of their email address. Is there a way to fix that? Users get confused and try to enter their email password over and over again and wonder why it doesn't work (and completely miss/ignore the "use another account" button even though they have instructions right in front of them). I'm also using the Office 2010 ADM's in group policy, but I haven't yet seen an option to specify what gets auto-populated in that windows security prompt.

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• Radeon hd 6570 black screen

  - by Sho

  I got some problem with new graphic card. Every time I use AMD Catalyst drivers on Windows or Linux, screen repeatedly goes black. This usually shows u when i open new cards in a browser, resize a window or run a program. Card runs smoothly on basic drivers but this means low resolution. 1940x1080 is native for my monitor so it causes a lot of problems. I've got a 600W Deus G1, so the power is not the problem. Maybe its a silly question, but would going form a vga cable to hdmi help to improve this situation? If not, can it be caused by slow processor or old mainboard? Im getting kinda confused about this whole thing...

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• Connecting FreeNAS 8 to Mac OS X Lion LDAP Server

  - by Absolution

  I currently have Mac OS X Lion Server running from a MacMini and want to use it purely as an LDAP server for authentication for FreeNAS 8. I have FreeNAS setup and running on a VM, all features working correctly and as expected however I cannot connect to my LDAP server (MacMini). Error message; **Nss_ldap: could not search LDAP server – server is unavailable** For LDAP service settings in FreeNAS, I know my Hostname and Base DN are correct (exact copies of what I set originally and ones that are shown in server:open directory overview) however I am unsure what to enter for Root bind DN, password and Suffix’s. I have researched into where I can find these out and other than following the FreeNAS examples it appears there is a way to find out within the Server Workgroup Manager specific to my settings – however this function is unavailable to me and cannot be ‘ticked’ to view for some strange reason. Some forums explain how Root bind DN should be uid=admin, dc=… and others cn=admin, dc=… – I’m rather confused and would appreciate your help or advice with this.

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• Java Framework Choice Question.

  - by Sarang

  We do have many frameworks available in Java. Struts, Swing, JSF 2.0, Spring etc are used as per their priority. Actually, I don't know how many they are as well! But, as I am fresher to Java, even learning after their architecture, I cannot decide which framework can be used with what type of Projects ! Also, I am confused with mixed use of framework like Spring + JSF. What is the benefit to it ? Another thing making me confusing is about the UI components available in market. Like, we do have Primefaces, Ice-faces, MyFaces, Rich-faces. They may or may not have been supporting AJAX in-built. They may contains some bugs as well. What is best choice for Framework + UI component that can directly provide a best feet solution for any project ?

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• Authenticating a Windows client to a Samba share

  - by hekevintran

  I have a Samba network share being served by a Linux machine. The share is read-only unless you give it a username and password. I want my Windows 7 client machine to connect to it. It appears that the Windows machine is connecting as a guest because it does not have write access. The Windows machine never asks me whether or not it should connect as a guest or with a username. How do I make the Windows machine authenticate? Where do I input my password? This seems like such a simple thing yet I am totally confused. On Mac OS and Linux, it simply asks you for a username.

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• When a python process is killed on OSX, why doesn't it kill the child processes?

  - by Hugh

  I found myself getting very confused a while back by some changes that I found when moving Python scripts from Linux over to OSX... On Linux, if a python script has called os.system(), and the calling process is killed, the called process will be killed at the same time. On OSX, however, if the main process is killed, anything that it launched is left behind. Is there something somewhere in OSX/Python where I can change this behaviour? This is causing problems on our render farm, where the processes can be killed from the management GUI, but the top level process is really just a wrapper, so, while the render farm management might think that the process has gone and the machine is freed up for another task, the actual processor-intensive task is still running, which can lead to huge blockages. I know that I could write more logic to catch the kill signal and pass it on to the child processes, but I was hoping that it might be something that could be enabled at a lower level.

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• How can I find a list of all SSE instructions? What happens if a CPU doesn't support SSE?

  - by Blastcore

  So I've been reading about how processors work. Now I'm on the instructions (SSE, SSE2, etc) stuff. (Which is pretty interesting). I have lot of questions (I've been reading this stuff on Wikipedia): I've saw the names of some instructions that were added on SSE, however there's no explanation about any of them (Maybe SSE4? They're not even listed on Wikipedia). Where can I read about what they do? How do I know which of these instructions are being used? If we do know which are being used, let's say I'm doing a comparison, (This may be the most stupid question I've ever asked, I don't know about assembly, though) Is it possible to directly use the instruction on an assembly code? (I've been looking at this: http://asm.inightmare.org/opcodelst/index.php?op=CMP) How does the processor interpret the instructions? What would happen if I had a processor without any of the SSE instructions? (I suppose in the case we want to do a comparison, we wouldn't be able to, right?)

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• Is any EXIF data stored within 3rd party Camera apps on the iPhone?

  - by 3rdparty

  I'm confused as to if any EXIF data is available when taking photos within 3rd party camera apps on the iPhone. My understanding is that Apple is currently not allowing any apps to save EXIF data to photos, and this is a limitation of saving to the camera roll on the phone. The last FAQ on this page indicates this, but appears to be out of date: http://www.codegoo.com/page/support I love some of the camera apps I've downloaded (Camera Genius, Best Camera, CameraBag) but don't want to continue using them if they aren't saving any/all EXIF data for the image. Anyone aware what the status of this 'limitation' is?

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• Apache+FastCGI Timeout Problem

  - by Sadjad Fouladi

  Hi all. I've recently installed mod_fastcgi and Apache 2.2. I've a simple cgi script as below (test.fcgi): #!/bin/sh echo sadjad But when I invoke "mysite.com/test.fcgi" I see "Internal Server Error" message after a short period of time. The error.log file shows this error message: [Tue Jan 31 22:23:57 2006] [warn] FastCGI: (dynamic) server "~/public_html/oaduluth/dispatch.fcgi" has failed to remain running for 30 seconds given 3 attempts, its restart interval has been backed off to 600 seconds This is my .htaccess file: AddHandler fastcgi-script .fcgi RewriteEngine On RewriteCond %{REQUEST_FILENAME} !-f RewriteRule ^(.*)$ django.fcgi/$1 [QSA,L] I'm very confused, please help me! [Sorry for my poor English!]

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• How to install the TRIM RAID update for the Intel storage controller?

  - by Mike Pateras

  I just found this article, that says that Intel now supports TRIM for SSDs when the Intel storage controller is in RAID mode. It links to this download page. I'm pretty excited about that, but I'm a little confused. There seem to be two sets of drivers, an executable and something that's bootable. I ran the executable. Is that just to apply the drivers to my system now, and are the bootable drivers so that if I re-format, I won't have to re-run everything? Do I need to do both? And is there a way to check if it worked? I'm running an i7 in Windows 7 (ASUS P6T Deluxe Motherboard) with RAID 0, if that's significant.

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• Do I need a ssl certificate if just pointing my domain to Cloudfront?

  - by hashpipe

  I have a website running on a domain (e.g site.com). I have an additional domain(e.g sitecdn.com) which basically points to Amazon Cloudfront for delivery. Amazon Cloudfront in turn basically fetches the data from the main domain (site.com). I use this setup primarily to have multiple subdomains of my sitecdn.com to point to assets via the cdn. The main website has a ssl certificate, and I intend to put all assets served from the cdn as https links only. Something like <img src="https://img.sitecdn.com/image.jpg" /> I'm a little confused whether I need a ssl for my cdn domain. In cloudfront I can set the setting to allow both https and http traffic. Do I need a ssl certificate for this ? If yes, then where do I install the ssl certificate, since I don't have a server for sitecdn.com.

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• PCRE limits exceeded, but triggering rules are SQL related

  - by Wolfe

  [Mon Oct 15 17:12:13 2012] [error] [client xx.xx.xx.xx] ModSecurity: Rule 1d4ad30 [id "300014"][file "/usr/local/apache/conf/modsec2.user.conf"][line "349"] - Execution error - PCRE limits exceeded (-8): (null). [hostname "domain.com"] [uri "/admin.php"] [unique_id "UHx8LEUQwYEAAGutKkUAAAEQ"] And similar are spamming my error log for apache. It's only the admin side.. and only these two lines in the config: line 349: #Generic SQL sigs SecRule ARGS "(or.+1[[:space:]]*=[[:space:]]1|(or 1=1|'.+)--')" "id:300014,rev:1,severity:2,msg:'Generic SQL injection protection'" And line 356: SecRule ARGS "(insert[[:space:]]+into.+values|select.*from.+[a-z|A-Z|0-9]|select.+from|bulk[[:space:]]+insert|union.+select|convert.+\(.*from)" Is there a way to fix this problem? Can someone explain what is going on or if these rules are even valid to cause this error? I know it's supposedly a recursion protection.. but these protect against SQL injection so I'm confused.

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• Why does the EFI shell not detect my Windows DVD?

  - by Oliver Salzburg

  I'm currently looking into (U)EFI for the first time and am already really confused. I insert the Windows Server 2008 R2 Enterprise disc into the DVD-ROM and boot into the EFI shell. The shell will automatically list all detected devices, which are: blk0 :CDRom - Alias (null) Acpi(PNP0A03,0)/Pci(1F|2)/Ata(Primary,Master)/CDROM(Entry0) blk1 :BlockDevice - Alias (null) Acpi(PNP0A03,0)/Pci(1F|2)/Ata(Primary,Master) To my understanding, it should have already detected the filesystem on blk0 and should have mounted it as fs0. Why is that not happening? If I insert a USB drive, it gets mounted just fine. The board is an Intel S5520HC in case that makes a difference.

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• Windows 7 safe mode pretends it's Windows XP?

  - by Joachim Kerschbaumer

  Just a question in between. A friend of mine brought me a laptop that does not work anymore and wanted me to check whether I can do something. She told me it's Windows 7, and startup screen and login screen look like it. However, as she gets a bluescreen on startup it is only possible to boot in safe mode where the system pretends to be Windows XP SP3. The system also may have 1 GB of RAM but the system itself states that it has 954 MB of RAM which is a value I've never seen before. Is everything corrupt from operating system to hardware, or am I just a newbie that does not know that Windows 7 pretends to be Windows XP SP3 in safe mode? Or is this laptop just the victim of an illegal, crazy copy of Windows XP sold as Windows 7? Maybe some strange Chinese stuff? I also recognized that the startup screen of Outlook Express reads "Outllok Express" (no typo) I´m kind of confused, maybe someone could put light into this ;)

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• Why does ganglia think my host is down?

  - by NZKoz

  I have ganglia set up to monitor our staging server, it's working great but I'm confused by the definition of 'down' to ganglia. There's a single node, running gmetad, gmond and the web frontend, but some small percentage of the time the web frontend shows some confusing output. Despite the fact that it's a single server in the cluster, and that server is the one serving the web interface, the dashboard output insists that the host is down. Then below that it has a graph which shows 50% down, 50% up. You can see an example of this here: http://i.imgur.com/MCWaS.jpg There's obviously something confusing ganglia somewhere, but I'm not sure where to start looking. Unfortunately googling for any combination of 'ganglia' 'down' 'metric name' seems return nothing but other people's ganglia installations displaying the same nonsense. Any tips on where to start looking would be greatly appreciated

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• So who decided VGA cables should be symetrical ? [closed]

  - by mgb

  < rant So who decided that VGA cables should be the same gender connector at both ends? I just spent an hour trying to fix a server that would apparently boot but wouldn't display any post messages - I needed to change some bios settings. The monitor gives me a helpful error message - "unable to display this resolution". Wondering how it can't show simple VGA res, I reset the bios, when that doesn't work I remove the BIOS battery. The system is in a rack with a keyboard and monitor mounted 6ft away - with the cable running through the normal waist thick rats nest of wiring of wiring. The monitor worked with another system, so it and the VGA cable are good, I brought in another monitor and tried that - still nothing. Eventually I ripped the rack apart to discover that the other end of the VGA connector I was trying to plug into the server was actually plugged into another server box ! And the second monitor I was testing was plugged into the first monitor. An error message like - "I'm actualy plugged into another monitor stupid" - would be useful. So would having a connector with a male end and a female end. < end rant - thank you

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• Parameters for selection of Operating system, memory and processor for embedded system ?

  - by James

  I am developing an embedded real time system software (in C language). I have designed the s/w architecture - we know various objects required, interactions required between various objects and IPC communication between tasks. Based on this information, i need to decide on the operating system(RTOS), microprocessor and memory size requirements. (Most likely i would be using Quadros, as it has been suggested by the client based on their prior experience in similar projects) But i am confused about which one to begin with, since choice of one could impact the selection of other. Could you also guide me on parameters to consider to estimate the memory requirements from the s/w design (lower limit and upper limit of memory requirement) ? (Cost of the component(s) could be ignored for this evaluation)

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• What is magento ecommerce plotting ???

  - by numerical25

  I am not sure if this is the appropriate place to to discuss this issue but I am a Magento developer and ever since they announced they were going to build magento as a PAAS platform, I began to not trust where they are trying to go with the company. As a business I respect where they are trying to go as a company, but as a developer who highly depends on their platform for my business, I feel that they will eventually become a player in their own game. Ebay has announced that they will be acquiring the license to the magento platform and this makes you wonder why a company like eBay would want to do such a thing. Ebay is known for their pre-built stores. it would seem they would only team with magento only to utilize their PAAS web stores. I dunno, maybe I am a little confused about the whole situation. that's why i would like to hear everyone else opinion.

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• How to access remote network resource from local machine

  - by jerluc

  I just configured VPN access successfully so that I now can connect to my workstation at work from my personal Linux box at home. The problem is that all of my dev files for a server I'm locally running are on my personal box and cannot be transfered to my workstation (at least not in any timely manner over this connection given the amount of data, in addition to the many reconfigurations which would be required for the server to run even if I could somehow get the files across). So essentially, I am able to run my server locally on my personal computer, however, the data-sources required for the back-end are accessible only from within the office's network. But is there some way for me to somehow either access the data-sources directly through a VPN connection or even if I need to be a bit more convoluted by connecting via VPN to my workstation and then somehow connecting to the data-sources through my workstation to my personal computer? And here I could really care less about the speed of the connection from my server to the data-sources since they will probably only be fetched a few times every hour or so. Thanks! Sorry if this a stupid question and/or doesn't make any sense! (And sorry for anyone who read this at stackoverflow, I posted it in the wrong area.)

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