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• Wifi antenna extension with F-connector/RG-6(RG-59) cable?

  - by rjz2000

  In an older house, the wire mesh in walls surrounding the furnace behave like a Faraday cage and block wifi signals. It is also difficult to lay new cable, however there is television cable to multiple locations due to there once having been a roof-installed, television antenna. It would be relatively trivial to install the wifi router at the center distribution point, then have the antenna broadcasting/receiving the signal plugged in at each of the old television outlets. I assume that it would not be too difficult to find an adapter for SMA <- F-type connectors. The cable is actually RG-59 rather than RG-6, but I assume that it still has relatively good RF isolation along its length, which is no more than a couple hundred feet in any direction. Does anyone know a problem with the idea? Will a router get confused if there is /too little/ interference between the two antenna? Is that length of cable (~100ft) too long for the signal a router broadcasts? I have seen that it is also possible to use old ~$30/each FiOS cable modems available on eBay to extend a network over television cable. However, that seems like a less elegant solution, and might interfere with upnp and dlna services I'd like to have work on a single network. Thanks if anyone has answers or suggestions before I try this project!

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• How to auto syncronize files with network drive on Windows XP?

  - by stephenmm

  Windows XP: I would like to auto synchronize files between a a local drive and a network drive. I am aware of Windows Briefcase but it is very slow and I have to tell it to synchronize. I really like the way Dropbox does there synchronization as it is almost instantaneous. It is very impressive. I would just use Dropbox but I cannot install it on the remote machine. Is there some tool or script I can create that will watch a particular folder for any changes and then sync those changes to the networked drive automatically and nearly instantaneously? CLARIFICATION: I would like this tool/script to to be a daemon that starts when windows starts and continually monitors a folder for any changes to its contents. Once it observes changes in the source or the destination it synchronizes the files that changed (Very similar to the way Dropbox works). I have a good idea about how I would do this in a Perl script and if a tool does not exist that does this I will write it myself in Perl. If someone has already done this can they share the script?

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• Replicated filesystem and EC2 MySQL

  - by El Yobo

  I'm currently investigating migrating our infrastructure over to run on Amazon's EC2 and am trying to figure out the best way to set up a MySQL service. I'm leaning towards running our own MySQL instances, rather than going with Amazon's RDS, but am still considering the best approach for performance and cost on the instance itself. In order to have persistent data, the MySQL data needs to be on an EBS volume (with some form of striped RAID, e.g. RAID0 or RAID10) to improve persistence. However, EBS IO is limited by the network interface (gigabit, so a theoretical maximum of 128 MB/s), while the ephemeral volumes have no such problem. I did see a suggestion for running two MySQL servers on an instance, with a master running on the ephemeral disk (which we would also RAID) and a slave storing changes to an EBS volume, but this has some additional overhead and complexity (two servers). What I was imagining is using some form of replicated file system such that I could have a filesystem on top of a RAID0 of ephemeral volumes to maximise performance all changes from the above immediately replicated to another RAID1 volume backed by multiple EBS volumes to ensure no data loss The advantages of this would be best possible IO performance for the DB server; no network delay in IO decreased IO on EBS volumes (as all read IO will be done on the ephemeral volumes) so decreased cost good data security, as it's backed onto redundant EBS volumes However, I haven't seen an appropriate system to replicate all changes from one volume to the other; is there a filesystem, or any other approach, which will do this? The distributed file systems, e.g. GlusterFS, DRBD etc seem to focus on replicating disks between servers, can they be set up to do what I'm interested in here? I also haven't seen anything about other's taking this approach. Do I have a solution in need of a problem here (i.e. is performance good enough, so this whole idea is redundant)? Is there some flaw in the plan?

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• RSS "Newspaper" / Google Reader replacement

  - by Sean D

  With the impending demise of Google Reader I've been looking at ways to replace it. I've decided that what might be cool is to get an email every morning, with all the updates from the last twenty-four hours, maybe in the style of a newspaper. That's not a very original idea, since sites like http://fivefilters.org/pdf-newspaper/ and http://feedjournal.com/ already do this, but they both have various drawbacks. In particular both require a single feed, will just take the last n items, and clicking around on their website. The Pro option for feedjournal seems almost like it would do the job, but the project seems to be dead, and there's no way to buy it. Before I hack together something crazy I'd like to know if there's a better solution to my problem. In short: I want to replace Google Reader with a daily pdf email, how should I do this? edit: I didn't award the bounty because nobody solved the problem (not that I'm assuming it has a solution). Answers like "well for the way I do things this wouldn't work" aren't actually helpful, even if they are well-meaning.

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• Which components should I invest in.. for a backup machine.

  - by Senthil

  I am a freelance developer. I have a PC, a laptop and an old testing and file server machine. I might add one or two in future. I want to have an on-site backup machine that can handle backups of ALL these machines - file backups, MySQL backups, backup of subversion repository, etc.. When building the machine, which components should I invest more in? Examples: The cabinet should have lots of room for expansion. Hard disk size should be large. But I guess hard disk speed need not be high (?) But other components like, RAM, PSU, Processor, Network card, Cooling, etc.. how much relative importance do these have in a backup machine? Which of these components should be high-end or large, and which ones need not be? Some Idea of the load: There will TBs of data. File backups and subversion repository backups will at least be done daily. MySQL backups done weekly. assume 3 machines at the moment and somewhere around 10 machines in the future.

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• RewriteRule causes POST data to get dumped before I can access it

  - by MatthewMcGovern

  I'm currently setting up my own 'webserver' (a Ubuntu Server on some old hardware) so I can have a mess around with PHP and get some experience managing a server. I'm using my own little MVC framework and I've hit a snag... In order for all requests to make it through the dispatcher, I am using: <Directory /var/www/> RewriteEngine On RewriteCond %{REQUEST_URI} !\.(png|jpg|jpeg|bmp|gif|css|js)$ [NC] RewriteRule . HomeProjects/index.php [L] </Directory> Which works great. I read on Stackoverflow to change the [L] to [P] to preserve post data. However, this causes every page to return: Not Found The requested URL <url> was not found on this server. So after some more searching, I found, "Note that you need to enable the proxy module, and the proxy_http_module in the config files for this to work." The problem is, I have no idea how to do this and everything I google has people using examples with virtual hosts and I don't know how to 'translate' that into something useful for my setup. I'm accessing my webserver via my public IP and forwarding traffic on port 80 to the web server (like I'm pretending I have a domain/server). How can I get this enabled/get post data working again? Edit: When I use the following, the server never responds and the page loads indefinately? LoadModule proxy_module /usr/lib/apache2/modules/mod_proxy.so LoadModule proxy_http_module /usr/lib/apache2/modules/mod_proxy_http.so <Directory /var/www/> RewriteEngine On RewriteCond %{HTTP_REFERER} !^http://(.+\.)?82\.6\.150\.51/ [NC] RewriteRule .*\.(jpe?g|gif|bmp|png|jpg)$ /no-hotlink.png [L] RewriteCond %{REQUEST_URI} !\.(png|jpg|jpeg|bmp|gif|css|js)$ [NC] RewriteRule . HomeProjects/index.php [P] </Directory>

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• How to automate downloading files?

  - by Damon

  I got a book which had a pass to access digital versions of hi-res scans of much of the artwork in the book. Amazing! Unfortunately the presentation of all the these are 177 pages of 8 images each with links to zip files of jpgs. It is extremely tedious to browse, and I would love to be able to get all the files at once rather than sitting and clicking through each one separately. archive_bookname/index.1.htm - archive_bookname/index.177.htm each of those pages have 8 links each to the files linking to files such as <snip>/downloads/_Q6Q9265.jpg.zip, <snip>/downloads/_Q6Q7069.jpg.zip, <snip>/downloads/_Q6Q5354.jpg.zip. that don't quite go in order. I cannot get a directory listing of the parent /downloads/ folder. Also, the file is behind a login-wall, so doing a non-browser tool, might be difficult without knowing how to recreate the session info. I've looked into wget a little but I'm pretty confused and have no idea if it will help me with this. Any advice on how to tackle this? Can wget do this for me automatically?

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• Postfix not delivering from external senders and not logging anything

  - by simendsjo

  Some semi-recent upgrades must have broken my postfix+dovecot configuration, but I'm having problems finding out what the cause is. My domain is simendsjo.me with the MX record mail.simendsjo.me. I can send mail to both local and external recipients, and it delivers mail from internal mailboxes. The problem is that mail from external senders isn't delivered, and nothing is logged at all. The external sender also doesn't receive any errors. I have no idea where to ever start looking as nothing is logged at all when external mail is sent to my server. So the first issue would be: How can I turn on some debug messages for postfix? I've tried: debug_peer_level = 2 debug_peer_list = simendsjo.me .. And _level = 999 and _list = gmail.com where I'm trying to send emails from. but nothing is logged. When sending mails from a local mailbox (but from an outside computer, not localhost), a lot is logged. I don't have any rules in iptables either. Any ideas how I can get some debug messages for postfix?

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• How can I optimize my ajax calls to deliver at 60ms.

  - by Quintin Par

  I am building an autocomplete functionality for my site and the Google instant results are my benchmark. When I look at Google, the 50-60 ms response time baffle me. They look insane. In comparison here’s how mine looks like. To give you an idea my results are cached on the load balancer and served from a machine that has httpd slowstart and initcwnd fixed. My site is also behind cloudflare From a server side perspective I don’t think I can do anything more. Can someone help me take this 500 ms response time to 60ms? What more should I be doing to achieve Google level performance? Edit: People, you seemed to be angry that I did a comparison to Google and the question is very generic. Sorry about that. To rephrase: How can I bring down response time from 500 ms to 60 ms provided my server response time is just a fraction of ms. Assume the results are served from Nginx - Varnish with a cache hit. Here are some answers I would like to answer myself assume the response sizes remained more or less the same. Ensure results are http compressed Ensure SPDY if you are on https Ensure you have initcwnd set to 10 and disable slow start on linux machines. Etc. I don’t think I’ll end up with 60 ms at Google level but your collective expertise can help easily shave off a 100 ms and that’s a big win.

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• How do I connect to and factory reset a Catalyst 3560 Switch?

  - by Josh

  My company just bought another company. In their server room they had some older hardware, which I would like to repurpose. One of these is a Cisco Switch: C3560G-48TS-S. I found some instructions about this switch here but this is not a guide for a beginner. I have no idea how to connect to this thing to begin running the commands. It says Configure the PC terminal emulation software for 9600 baud, 8 data bits, no parity, 1 stop bit, and no flow control. But I can't find anything on how to do this (assuming with telnet?) or even what program to use. I also don't know how to find the IP address of the device to connect to it. My research also says once I get in there, I need to run clear config all Is this the right command? Also, what if I can't get the username and password for these devices? Is there some way to factory reset (my only experience is with devices that have a hardware reset button) EDIT: I should note that when I push the button on the front the three lights blink, which according to the documentation indicated the switch is configured and "not available for express setup"

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• Open ports broken from internal network

  - by ksvi

  Quick summary: Forwarded port works from the outside world, but from the internal network using the external IP the connection is refused. This is a simplified situation to make the explanation easier: I have a computer that is running a service on port 12345. This computer has an internal IP 192.168.1.100 and is connected directly to a modem/router which has internal IP 192.168.1.1 and external (public, static) IP 1.2.3.4. (The router is TP-LINK TD-w8960N) I have set up port forwarding (virtual server) at port 12345 to go to port 12345 at 192.168.1.100. If I run telnet 192.168.1.100 12345 from the same computer everything works. But running telnet 1.2.3.4 12345 says connection refused. If I do this on another computer (on the same internal network, connected to the router) the same thing happens. This would seem like the port forwarding is not working. However... If I run a online port checking service on my external IP and the service port it says the port is open and I can see the remote server connecting and immediately closing connection. And using another computer that is connected to the internet using a mobile connection I can also use telnet 1.2.3.4 12345 and I get a working connection. So the port forwarding seems to be working, however using external IP from the internal network doesn't. I have no idea what can be causing this, since another setup very much like this (different router) works for me. I can access a service running on a server from inside the network both through the internal and external IP.

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• Windows Displays Double the Actual Installed Physical Memory

  - by Andrew Barber

  I have a server I've installed Windows Web 2008 R2 on, which is reporting that I have double the physical memory installed as is actually the case. In msinfo32 "Installed Physical Memory" shows as 2x what ever the actual installed amount is, though "Total Physical Memory" shows the correct amount. The "System" info window shows installed memory as 2x, with the correct amount in parenthesis listed as the "usable" amount). This server mistakenly had Windows Web 2008 (32-bit) installed on it just previously, and that OS also reported the same faulty information as Win2K8R2 is reporting. BIOS reports the correct amount, memtest was run on this server before installation, and a previous Windows 2000 instance installed on this system also reported the correct amount, as I recall. Server operation seems to be fine as well (it's only trying to use the correct amount of memory). The server is a generic pizzabox running on a SuperMicro X6DVL-EG with dual Xeon-3.2's. Memory installed are 4 matching mt18vddf12872g-335c3 sticks (1GB pc2700 DDR ECC REG cl2.5) This behavior occurs whether two or all four are installed. So, has anyone seen something like this before? Have any idea about what's causing it, and how I should be concerned about it? Everything else seems good so far, and I'll be upgrading the memory before putting the server into service, but I don't want to spend too much time/money/effort on the server if it's got something odd going wrong here. UPDATE: There was a question I ran into regarding memory sparing in the BIOS and a possible (buggy) effect thereof; however, flipping that bit back and forth in the BIOS revealed that isn't the issue. Still flummoxed a bit about this one, though I still have seen no negative impacts. Post-Answer Update (January 13, 2011): Upgrading the system with new, larger memory has fixed this issue.

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• Robocopy (without /l flag) running for hours making log file huge, but not actually copying anything

  - by Mickster

  Here's my command: Robocopy C: C:\C_root /FP /BYTES /TEE /S /E /COPYALL /DCOPY:T /MOVE /Z /ETA /XJ /R:2 /W:30 /XF pagefile.sys /XD /LOG:C:\robocopy.log. BTW, notice the /XD option above. After that I had a few directories that I want to omit. I showed these between angle brackets like this: (left angle bracket) a few dirs I wanted to exclude (right angle bracket). Amongst these dirs was the C_root dir itself, so that it did not get into an "infinite" recursion. (This part was stripped from the post because angle brackets apparently have a meta-meaning to superuser.com about hyperlinks.) The command window this was running in listed a few "EXTRA" files then "hung". By this, I mean no more output, no cmnd prompt, and if I tried to scroll it up, it would immediately scroll right back to the bottom. After about six hours, it finally finished, although I never got a cmnd prompt back in the window I started it in. DIR shows the log file at more than 1.3GB, but when I try to do a MORE on it, I get "Cannot access file". C:\C_root never grew larger. Does anyone have an idea what is going on here?

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• Exchange 2010: Send emails via STMP with custom From address to outside the domain

  - by marsze

  The requirement(s): (1) Connect to Exchange via STMP and (2) basic authentication and send emails with a (3) custom From address to (4) recipients outside the domain. I was able to get (1) - (3) working. I created a dedicated receive connector for this task and configured it like this: Permissions: ms-Exch-SMTP-Accept-Any-Recipient (for authenticated users) ms-Exch-SMTP-Accept-Authoritative-Domain-Sender (for authenticated users) ms-Exch-SMTP-Accept-Any-Sender (for authenticated users) Authentication: TLS Basic Authentication (without TLS) Exchange Server Authentication However, I'm still struggeling with (4): I can send with "fake" From addresses to recipients inside the domain. Also, I can send with the original From address to recipients outside the domain. Can you tell me what I'm missing, to configure Exchange to send emails with changed From addresses to recipients outside the domain? (Or is this even possible at all?) Thanks. UPDATE I have to correct myself: it seems to be working after all. There must be some issue with the mailbox I used for testing. It turned out it's working with other external mailboxes. However, I still have no idea what was different there... Anyways, you can take this as a documentation on how to configure Exchange in such a way ;)

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• Snort not detecting outgoing traffic

  - by Reacen

  I'm using Snort 2.9 on windows server 2008 R2 x64, with a very simple configuration that goes like this: # Entire content of Snort.conf: alert tcp any any -> any any (sid:5000000; content:"_secret_"; msg:"TRIGGERED";) # command line: snort.exe -c etc/Snort.conf -l etc/log -A console Using my browser, I send the string "_secret_" in the url to my server (where Snort is located). Example: http://myserver.com/index.php?_secret_ Snort receives it and throws an alert, it works, no problem ! But when I try something like this : <?php // (index.php) header('XTest: _secret_'); // header echo '_secret_'; // data ?> If I just request http://myserver.com/index.php, it does not work or detect anything from the outgoing traffic even though the php file is sending the same string both in headers and in data, with no compression/encoding or whatsoever. (I checked using Wireshark) This looks to me like a Snort problem. No matter what I do it only detects receiving packets. Did anyone ever face this sort of problems with Snort ? Any idea how to fix it ?

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• Unexpected behaviour in a Lotus Notes programmable table

  - by Mark B

  I'm designing a workflow database in Lotus Notes 6.0.3 (soon upgrading to 8.5), and my OS is Windows XP. I have recently tried converting a tabbed table into a programmable one. This was so that I could control which tab was displayed to the user when it was opened, so that they were presented with the most appropriate one for that document's progress through the workflow. That part of it works! One of the tabs features a radio button that controls visibility of the next tab, and a pair of cascading dialogue boxes. One contains the static list "Person":"Team", and the other has a formula based on the first: view:=@If(PeerReview = "Team"; "GroupNames"; "GroupMembers"); @Unique(@DbColumn(""; ""; view; 1)) The dialogue boxes have the property "Refresh fields on keyword change" selected. The behaviour that I wasn't expecting is this. If the radio button is set to "Yes" and a value is selected in one of the dialogue boxes, the table opens the next tab. If the radio button is set to "No" and a value is selected in one of the dialogue boxes, the entire table is hidden. I can duplicate the latter by switching off the "Refresh fields on keyword change" property on the dialogue boxes and instead pressing F9 after selecting a value. I have no idea why the former occurs, though. The table is called "RFCInfo", and I have a field on the form called "$RFCInfo" which is editable, hidden from all users who aren't me and initially set by a Postopen script, which I can post if necessary - it's essentially a Select Case statement that looks at a particular item value and returns the name of the table row relating to that value. Can anyone offer any pointers?

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• Configuring WPA WiFi in Ubuntu 10.10

  - by sma

  Hello, I am trying to configure my wireless network on my laptop running Ubuntu 10.10 and am having a bit of difficulty. I am a complete Linux newb, but want to learn it, hence the reason I'm trying to set this up. Here's the vitals: It is a Gateway 600 YG2 laptop. It was previously running Windows XP, but I installed Ubuntu 10.10 in place of it (not a dual boot, I removed XP altogether). I have an old wireless card that I'm trying to resurrect. I haven't really used the card in a couple years, but it seems to still work, I just can't connect to my home's wireless network. The card is a Linksys WPC11 v2.5. When I plug it in, Ubuntu recognizes the network, but won't connect to it. My home network uses WPA encryption and the only connection type that Ubuntu's network manager is giving me is WEP and then it asks for a key -- I have no idea what that key should be. So, basically, I'm asking, is there a way I can instead connect through WPA? I've tried creating a new connection in network manager, but that won't work, it keeps falling back to the WEP connection and asking me for a key. I have tried to install the XP driver using ndiswrapper but I don't know if that's working or not. Is there a way to tell if: A) the card is working as it should B) the correct drivers are installed (again, I installed the XP one using ndiswrapper NET8180.INF, but I'm not sure what to do next) Any help would be appreciated. Thank you.

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• How to stop my wireless adapter from received dhcp from router (windows)

  - by baobeiii

  Hi, I have a windows 7 computer which is connected via vpn to an OpenVpn server which happens to be in another country. I have all internet traffic being routed from my computer through the vpn to the server. However dns queries are not going through the vpn, but are instead going directly to my isp's dns via a route outside of the vpn tunnel. This is happening because my wireless adapter is configured to obtain DNS server address automatically. The router that stands between my computer and the internet happens to have a DCHP server running on it that is assinging my computer with the DNS addresses of the isp. The issue is, i haven't been able to stop my wireless adapter on my computer from receiving the dns settings from the router. I've tried selecting 'use the following dns server addresses' and then just leaving them blank, but ipconfig /all shows me that this hasn't worked and i'm still getting dns form the router. So is there any way to completely stop my windows wireless adapter from receiving these settings from the router? I have the OpenVpn server pushing to my computer's tun adapter the dns that it should be using. I'd rather solve this in a way that doesn't involve disabling the dhcp server on the router or fiddling with the router. The reason is i'm on a laptop and i want my vpn to not leak dns even when i'm out, for example in wireless hotspots. I know if i could just force the wireless adapter to ignore the router's dhcp server then my dns queries would go through the tunnel to the dns address pushed by the OpenVpn server. Sorry, i know thats long winded, if you have any idea's please do tell me. Thanks and merry xmas.

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• Remote Desktop connection to vista vs. xp

  - by CMP

  I am trying to log into my work computer remotely. I am using Windows 7 on my laptop. I have created a vpn connection to the network, and I am doing a remote desktop connection directly to the ip of my box (192.168.xxx.yyy). If I do a remote connection to a different box, running xp, it goes into remote desktop mode immediately and I see the windows login dialog as I am used to seeing. If I try remoting to my box, which is running vista, I do not see the remote desktop mode, but an additional dialog on my local machine asking for my credentials. It defaults in my local username. It allows me to log in as a different user, but the domain it has is still my local domain, not my work domain, so none of my usernames or passwords work. There doesn't appear to be a way to change the domain. Trying to hit several more boxes, it appears to act differently on xp and vista target machines. I feel like this must be a configuration issue, but I am not sure what the problem is. Any idea on how I can connect?

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• Mixing both local and nonlocal addresses on three switches

  - by klew

  I have four computers that have nonlocal addresses like 150.X.X.X. Now I also get another few computers that should be only accessible through a gateway (it will be computing cluster) and they addresses are 10.0.0.X. I also wanted to include those four older computers to this new cluster, but I want them to be accessible from internet on nonlocal addresses (so I would like to set up them on both 150.X.X.X and 10.0.0.X addresses - I've set up it as interface eth0:0 since I have only one NIC). Those new computers have their switch and old computers also have their own switch. Both of them are connected to another (third) switch. The problem is that those old computers see each other (I can ping them), and also new computers see each other, but I can't ping old computer from new computer and vice versa. However pinging on nonlocal adresses works as expected. I looked into switch configuration and didn't find anything useful. I have no idea what I missed here. Can somebody help? All computers have Ubuntu Server 10.04

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• Getting PAM/user info into php - something like Net_Finger instead of a db?

  - by digitaltoast

  I've got a very small user group who just need to login, upload, check and then move specific files to a different area when ready. Right now, I use the nginx PAM auth module to log them in against their unix accounts. As their login is their home directory, I've already got the info to send the uploads to the right area - one line of php and no database needed. But I'm maintaining a separate DB just so PHP can welcome them, grab their email and send them an email when processed. Yes, sure I could use nosql or sqlite instead so as to not need a whole mysql install. But it occurred to me that as I've got all these blank user fields for phone numbers I could populate with any data, that I could use something like php's Net_Finger. Which failed for me with: sudo pear install Net_Finger Starting to download Net_Finger-1.0.1.tgz (1,618 bytes) ....done: 1,618 bytes could not extract the package.xml file from "/build/buildd/php5-5.5.9+dfsg/pear-build-download/Net_Finger-1.0.1.tgz" Download of "pear/Net_Finger" succeeded, but it is not a valid package archive Error: cannot download "pear/Net_Finger" At which point I thought I'd stop, and take a ServerFault reality check - is this a really bad/dangerous/stupid idea just to stop me having to maintain details in two places rather than one? It there a better way? Googling shows that it's not an oft-asked thing, so perhaps with good reason?

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• Good support to multiple desktops AND multiple monitors in Linux (Ubuntu)?

  - by Somebody still uses you MS-DOS

  I'm starting to have A LOT of opened windows in my machine. Sometimes within a project, I have e-mail/task management/personal e-mail/twitter, and a lot of different opened applications/terminal in my Linux environment. Nowadays I have 4 worspaces: Corporate management (e-mail) and corporate messenger; Work (Documents, Requisites) Dev (Development, All gVim windows, terminal and Firefox for development) Personal (Personal stuff: personal e-mail, delicious, twitter and so on) Sometimes it would be interesting to have different workspaces to projects instead of this configuration I have nowadays that are classes of work (bad name, I know, but I think you got the idea). I'm starting to think about using two monitors: one with Corporate Management, Work and Personal. The second monitor is only the development state: each workspace here is about a project being worked on instead of groups of works like before. A workspace may be implementing different classes for example. My question is: I just want to change to a second monitor using the mouse. I want to still be able to change workspaces in the same monitor using keyboard shortcuts. The keyboard shortcuts wouldn't change monitors, just worskpaces on the same monitor. Does Linux (Ubuntu 10.04 Lucid Lynx) support this envisioned setup? If so, how?

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• Oracle Linux screen freezes during installation

  - by Fearless

  I was installing Oracle Linux 6.4 on a server, and the screen suddenly froze. Here were the previous steps: I put in the disk, clicked install, checked the disk (no errors), did pre-install setup (clock, root password, host+domain name, etc.), configured two 40GB hard drives in a RAID1 array (no swap, 3100mb encrypted raid partitions, ~100mb ext4 partition mounting to /boot, encrypted ext4 RAID device with mounting to /), selected packages, hit continue. The system did its short preinstall processes, then when to the main installation screen with the long status bar. The installer proceeded like always, but around package 250 out of ~1000, the screen suddenly went black with a text cursor in the upper left corner of the screen and the mouse cursor in its previous place. Neither cursor moved and the only thing that triggered a response was a ctrl-alt-delete that rebooted it. I have run this in VMs before without this issue. Memtest hasn't reported anything, and the media check went smoothly. The machine has supported Ubuntu server without issues before. Any ideas? I have tried booting after that, but the grub bootloader tries to find fd0 for some reason (I have no idea why it would search for the floppy disk). UPDATE My server successfully installed, but won't boot up. I think that, for some reason, it is still using the old bootloader from the previous installation. Any ideas on how to fix that?

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• Scaling a node.js application, nginx as a base server, but varnish or redis for caching?

  - by AntelopeSalad

  I'm not close to being well versed in using nginx or varnish but this is my setup at the moment. I have a node.js server running which is serving either json, html templates, or socket.io events. Then I have nginx running in front of node which is serving all static content (css, js, etc.). At this point I would like to cache both static content and dynamic content to memory. It's to my understanding that varnish can cache static content quite well and it wouldn't require touching my application code. I also think it's capable of caching dynamic content too but there cannot be any cookie headers? I do use redis at the moment for holding session data and planned to use it for other things in the future like keeping track of non-crucial but fun stats. I just have no idea how I should handle caching everything on the site. I think it comes down to these options but there might be more: Throw varnish in front of nginx and let varnish cache static pages, no app code changes. Redis would cache dynamic db calls which would require modifying my app code. Ignore using varnish completely and let redis handle caching everything, then use one of the nginx-redis modules. I'm not sure if this would require a lot of app code changes (for the static files). I'm not having any luck finding benchmarks that compare nginx+varnish vs nginx+redis and I'm too inexperienced to bench it myself (high chances of my configs being awful). I'm basically looking for the solution that would be the most efficient in terms of req/sec and scalable in the future (throw new hardware at the problem + maybe adjust some values in a config = new servers up and running semi-painlessly).

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• What is the typical maximum number of database connections for Oracle running on Windows server ?

  - by Sake

  We are maintaining a database server that serve a large number of clients. Each client typically running serveral client-applications. The total number of connections to the database server (Oracle 9i) is reaching 800 connections on peak load. The windows 2003 server is starting to run out of memory. We are now planning to move to 64bit Windows in order to gain higher memory capability. As a developer I suggest moving to multi-tier architecture with conneciton pooling, which I believe is a natural solution to this problem. However, in order to support my idea, I want the information on: what exactly is the typical number of connections allowed for Oracle database ? What is the problem when the number connections is too high ? Too much memory comsumption ? or too many sockets opened ? or too many context switching between threads ? To be a little bit specific, how could Oracle Forms application scale to thousand of users without facing this problem ? Shall Oracle RAC applied to this case ? I'm sure the answer to this question should depend on quite a number of factors, like the exact spec of the hardware being used. I'm expecting a rough estimation or some experience from the real world.

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