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• VirtualBox doesn't see raw partitions

  - by smbear

  What I want to achieve is to set up virtual machine with VirtualBox. Host OS is Windows 7 Home Premium, guest will be (k)Ubuntu 12.04 on a raw partition. The first problem is that when I issue following command: VBoxManage.exe internalcommands listpartitions -rawdisk \\.\PhysicalDrive0 I get following result: Number Type StartCHS EndCHS Size (MiB) Start (Sect) 1 0xee 0 /0 /1 1023/254/63 715404 1 I'm guessing that VirtualBox is unable to see my partitions. If I use diskpart tool, then all partitions are listed correctly (note Polish language version of Windows): DISKPART> select disk 0 Obecnie wybranym dyskiem jest dysk 0. DISKPART> list partition Partycja ### Typ Rozmiar Przesuniecie ------------- ---------------- ------- ------------ Partycja 1 System 200 MB 1024 KB Partycja 2 Zarezerwowany 128 MB 201 MB Partycja 3 Podstawowy 139 GB 329 MB Partycja 5 Nieznany 4883 KB 140 GB Partycja 6 Podstawowy 50 GB 140 GB Partycja 7 Podstawowy 484 GB 190 GB Partycja 4 Odzyskiwanie 24 GB 674 GB Additional note: my PC is using EFI to boot OS. Basing on the results listed above, I believe that: I messed up with my partition table. Something is wrong with VirtualBox. Can anyone help with this issue?

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• IBM BladeCenter S: Disk Configuration

  - by gravyface

  Have just the one storage bay right now (SAS 15K 600GB x 6) and have configured one storage pool in RAID 10 with 4 disks (and two global spares). For each blade, I've created a volume and mapped accordingly: Blade #1 400 GB Blade #2 200 GB Blade #3 100 GB Blade #4 100 GB When I boot up Blade 1 and enter into the UEFI Setup (F1) followed by the Adapters and UEFI Drivers LSI Logic Fusion MPT SAS Driver Utility, I see 4 disks: two are the on-board 73GB drives, the other two are 200GB each and assume I'm being presented with two logical disks from the volume I created and mapped to this blade. I was a bit surprised by this: I figured I would've been presented with one logical drive per volume, not two. I'm assuming I can just configure whatever RAID level I wish that supports two disks, but not really sure what the benefits/trade-offs here. Should I go with RAID 10 on top of RAID 10? RAID 0? Software RAID 0/1/10? Does it even matter? If this is "normal" to see two disks, then I'm going to likely just do some benchmarking and see if it makes a difference changing the RAID levels (my guess is no); if this is not normal, well, please let me know. :)

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• CentOS 6.5 x64 + Ajendi +nginx + php-fpm + mysql setup unable to load the PHP page

  - by Francis

  I'm using Ajendi to setup a PHP web server, I can load the PHP info page, when I try to load the PHP copy from other server, I get a blank page with this log appear on access log, I have no clue what was wrong and troubleshoot further, please advice. x.x.x.x - - [28/May/2014:10:08:37 -0400] "GET /index.php HTTP/1.1" 200 31 "-" "Mozilla/5.0 (Windows NT 6.1; rv:29.0) Gecko/20100101 Firefox/29.0" 2.6.32-431.1.2.0.1.el6.x86_64 cat /etc/redhat-release CentOS release 6.5 (Final) The vhost config AUTOMATICALLY GENERATED - DO NO EDIT! server { listen *:80; server_name test.com www.test.com; access_log /var/log/nginx/access.log; error_log /var/log/nginx/error.log; root /www; index index.html index.htm index.php; location ~ \.php$ { alias /www; fastcgi_index index.php; include fcgi.conf; fastcgi_pass unix:/var/run/php-fcgi-php-fcgi-0.sock; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; } }

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• Can I autoregister my servers hostname in my local DNS? [on hold]

  - by Christian Wattengård

  We have evaluated a W2k12 server as a domain controller at work. This has the extra benefit of registering every "subordinate" computers name in it's DNS so that I don't have to go around remembering IP's all the time. (And it let's me easily run dhcp also on my "pop-up" dev-servers). We need to rework our work network for several odd reasons, and in this new scenario there was no money for an extra Windows 2012 license. We have at our disposal several old boxes that run linux quite well. Is it possible to set up a DNS-server-"appliance" that somehow autoregisters it's own hostname.. Scenario: Router (N66u) on 172.20.20.1. Runs DHCP on 172.20.20.100-200 range. Server [verdant] of a *nix flavor on 172.20.20.2 Laptop [speedy] of W8 flavor on DHCP assigned Laptop [canary] of W8 flavor on DHCP assigned Desktop [lianyu] of Ubuntu flavor on DHCP assigned What I would like is that all of the above servers (except possibly the router) would be available on verdant.starling.lan and canary.starling.lan and so on. This is how it works right now (except the Ubuntu box... I haven't cracked that one yet) because Windows just does this for you.. I would also be able to do this without any manual labor on the server. When I tell my box it's name is smoak it should "immediately" be available as smoak.starling.lan without any extra configuration on my part. How can I do this in a Linux (Ubuntu) environment?

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• How can I create a VLAN on my extreme switch for a seperate subnet/domain?

  - by drpcken

  I'm putting together a small active directory implementation for a buddy of mine. I currently have 2 servers (one is the primary domain controller) and a couple clients. I need to test and run updates on every machine on this domain, but I would have plug them into my current LIVE domain to get it internet access. From what I've read having two separate domains on a single subnet is a bad idea (even though it is temporary) so I don't want to risk messing anything up on my production domain. I'm pretty sure I can create a separate VLAN on my extreme 48 port switch and plug this smaller domain into it on a different subnet, but I don't know the commands. Both subnets would need internet access of course (one of the things I can't wrap my head around is routing internet traffic between subnets (gateway is on production subnet). My production domain is on subnet 192.168.200.0. My new domain I want to put online would go into subnet 192.168.10.0. A shove in the right direction would be greatly appreciated. Thank you!

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• How to get http requests details in a tcpdump?

  - by tucson

  I am trying to get a tcpdump trace of some http requests. Here is what I got so far (I replaced the real IP addresses with REMOTE and LOCAL): C:\>Windump -na -i 3 ip host REMOTE and ip src LOCAL and tcp port 80 Windump: listening on \Device\NPF_{8056BE5E-BDBB-44E6-B492-9274B410AD66} 13:13:34.985460 IP LOCAL.4261 > REMOTE.80: . 1784894764:1784894765(1) ack 1268208398 win 65535 13:13:38.589175 IP LOCAL.4302 > REMOTE.80: F 3708464308:3708464308(0) ack 982485614 win 65535 13:13:38.589285 IP LOCAL.4303 > REMOTE.80: F 890175362:890175362(0) ack 2462862919 win 65535 13:13:38.589330 IP LOCAL.4304 > REMOTE.80: F 1838079178:1838079178(0) ack 156173959 win 65535 13:13:38.589374 IP LOCAL.4305 > REMOTE.80: F 3952718843:3952718843(0) ack 2209231545 win 65535 13:13:38.589413 IP LOCAL.4306 > REMOTE.80: F 446105750:446105750(0) ack 3141849979 win 65535 13:13:38.590265 IP LOCAL.4302 > REMOTE.80: . ack 2 win 65535 13:13:38.590403 IP LOCAL.4304 > REMOTE.80: . ack 2 win 65535 13:13:38.590429 IP LOCAL.4303 > REMOTE.80: . ack 2 win 65535 13:13:38.590484 IP LOCAL.4305 > REMOTE.80: . ack 2 win 65535 13:13:38.590514 IP LOCAL.4306 > REMOTE.80: . ack 2 win 65535 But I do not get the following level of details: Request URL:http://domain.com/index.php Request Method:POST Status Code:200 OK POST /index.php HTTP/1.1 Host: domain.com Connection: keep-alive Content-Length: 151 Cache-Control: max-age=0 etc How can I get this level of data?

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• Wireless signal changes from strong to weak after connecting

  - by gibberish

  Router (primary AP) is a WRVS4400N, WAP (signal booster) is a WAP4410N. Problem: User is physically located within ten feet of WAP (200 feet from main wireless router). Signal is at 5 bars as user connects to wireless network. Within seconds, signal is at or below two bars and connection is poor. Background: Trying to solve problem of weak wireless signal in back offices. Desired result is for client laptops to automatically switch to the stronger signal. WAP is connected to network via Ethernet cable. WAP is set to AP mode (instead of Wireless Repeater mode) WAP does appear to boost signal. Using Windows 7 sys tray Connect To A Network applet, can observe signal boost as laptop approaches the WAP. Above-described problem happens to users located near or beyond the WAP. It does not happen to users in close proximity to the router. Secondary Question: If using WAP in AP Mode, do WAP and Router (primary AP) need to be on the same channel?

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• Ways to parse NCSA combined based log files

  - by Kyle

  I've done a bit of site: searching with Google on Server Fault, Super User and Stack Overflow. I also checked non site specific results and and didn't really see a question like this, so here goes... I did spot this question, related to grep and awk which has some great knowledge but I don't feel the text qualification challenge was addressed. This question also broadens the scope to any platform and any program. I've got squid or apache logs based on the NCSA combined format. When I say based, meaning the first n col's in the file are per NCSA combined standards, there might be more col's with custom stuff. Here is an example line from a squid combined log: 1.1.1.1 - - [11/Dec/2010:03:41:46 -0500] "GET http://yourdomain.com:8080/en/some-page.html HTTP/1.1" 200 2142 "-" "Mozilla/5.0 (Windows; U; Windows NT 6.1; C) AppleWebKit/532.4 (KHTML, like Gecko)" TCP_MEM_HIT:NONE I'd like to be able to parse n logs and output specific columns, for sorting, counting, finding unique values etc The main challenge and what makes it a little tricky and also why I feel this question hasn't yet been asked or answered, is the text qualification conundrum. When I spotted asql from the grep/awk question, I was very excited but then realised that it didn't support combined out of the box, something I'll look at extending I guess. Looking forward to answers, and learning new stuff! Answers doesn't have to be limited to platform or program/language. For the context of this question, the platforms I use the most are Linux or OSX. Cheers

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• Proper Outlook Free/Busy status when working from home

  - by rwmnau

  Our office (pretty large - about 200 people) has recently started part-time telecommuting. It's only one day/week now, but it's already raised some questions about availability, so I wanted to see how the users here, some of whom I'm sure telecommute to a corporate job, how they set their out of office status. Outlook has four statuses, and here's what I (and most others?) take them to mean: Free: I'm available for meetings Busy: I'm in a meeting or otherwise occupied, and unavailable Tentative: Shy away from scheduling over, but I'm available if needed Out of office: I'm on vacation and unavailable. However, I don't travel for work - do people tend to use this status to mean they're remote, but available for a phone call/bridge? As we begin to telecommute, I'll be available by phone for meetings, but not in person - any meeting can have a conference bridge, but some meetings just need to be in person. I'd like to send the right message about my status - people can schedule meetings with me on my telecommute days, but they should expect me to be on a conference bridge when they do. What status do people use? Does "Out of Office" correctly reflect that you're working from home, even though I perceive this to mean that somebody is on vacation? Maybe I'm the only one confused here, but as a company that's never before done telecommuting of any kind, I'm in the dark about standard practices. Thanks for the insight! Though this isn't a technical question directly, I'm hoping it's still applicable to the group and constructive - if it's not, please close it and accept my apology.

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• Raspberry pi slows down my entire network

  - by gnusouth

  Whenever my Raspberry Pi is connected to the network (via ethernet) the entire network is slowed to a crawl. On my main computer, ping times for google.com go from ~10ms to ~200ms and it takes forever to load web pages. Connections are also slow on the Pi, with an apt-get update showing pathetic speeds in the order of 1KB/s. Turning off the Pi completely removes the drag from the network. I've tried static and dynamic IP addresses for the Pi, but both have the same problems. I'm currently using Raspbian (downloaded today), but also had this problem with Arch Linux. I've checked the connection's duplex with dmesg | grep -i duplex, which shows that the Pi's connection is running at 100Mbps, full-duplex, as expected. My modem/router is a Billion 7404VNPX (an Australian thing); relatively high-end, albeit a bit buggy at times (it will occassionally delete all its firewall settings). It assigns IPs in the range 192.168.1.1 to 192.168.1.20 and has 192.168.1.254 as its own IP. When I assign static IPs I tend to use the 192.168.1.200 area. Does anyone have any idea as to what could be causing this weird slowdown? Or any tests I could try? Thanks

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• xrandr fails when 3rd monitor has higher resolution

  - by Pi3cH

  I tried many combinations with xrandr command under lubuntu 12.04 to setup my three monitors DVI (DELL 1) left detected as HDMI1 HDMI (LG E2290) middle detected as HDMI2 VGA (DELL 2) right detected as VGA1 I can get the display with fix 1280x1024 on all the monitors. But once I setup 1280x1024 + 1920x1080 + 1280x1024, I get blank screen on all the monitors. Sometimes it throws crts fail error instead of blanking out. Anyone have similar issues? any solutions/workarounds? P.S. I can setup two monitors using 1280x1280 and 1920x1080 P.S.S. HDMI2 required at least 1920x1080 to display sharp picture. Outputs (it seems graphic card supports up to 8192x8192): xrandr Screen 0: minimum 320 x 200, current 3840 x 1024, maximum 8192 x 8192 VGA1 connected 1280x1024+2560+0 (normal left inverted right x axis y axis) 338mm x 270mm 1280x1024 60.0*+ 75.0 1152x864 75.0 1024x768 75.1 60.0 800x600 75.0 60.3 640x480 75.0 60.0 720x400 70.1 HDMI1 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 376mm x 301mm 1280x1024 60.0*+ 75.0 1152x864 75.0 1024x768 75.1 60.0 800x600 75.0 60.3 640x480 75.0 60.0 720x400 70.1 HDMI2 connected 1280x1024+1280+0 (normal left inverted right x axis y axis) 477mm x 268mm 1920x1080 60.0 + 1680x1050 60.0 1280x1024 75.0 60.0* 1152x864 75.0 1024x768 75.1 60.0 800x600 75.0 60.3 640x480 75.0 60.0 720x400 70.1 DP1 disconnected (normal left inverted right x axis y axis) DP2 disconnected (normal left inverted right x axis y axis) 3 CRTs (0,1 VGA, 0,1,2 for other HDMI) xrandr --verbose VGA1 connected 1280x1024+2560+0 (0x47) normal (normal left inverted right x axis y axis) 338mm x 270mm Identifier: 0x42 Timestamp: 51324 Subpixel: unknown Gamma: 1.0:1.0:1.0 Brightness: 1.0 Clones: CRTC: 0 CRTCs: 0 1 ... HDMI1 connected 1280x1024+0+0 (0x47) normal (normal left inverted right x axis y axis) 376mm x 301mm Identifier: 0x43 Timestamp: 51324 Subpixel: unknown Gamma: 1.0:1.0:1.0 Brightness: 1.0 Clones: CRTC: 1 CRTCs: 0 1 2 ... HDMI2 connected 1280x1024+1280+0 (0x47) normal (normal left inverted right x axis y axis) 477mm x 268mm Identifier: 0x44 Timestamp: 51324 Subpixel: unknown Gamma: 1.0:1.0:1.0 Brightness: 1.0 Clones: CRTC: 2 CRTCs: 0 1 2 Below command fails: xrandr --output VGA1 --auto --output HDMI2 --auto --left-of VGA1 --output HDMI1 --auto --left-of HDMI2 Below command passes: xrandr --output VGA1 --auto --output HDMI2 --mode 1280x1024 --rate 60.0 --left-of VGA1 --output HDMI1 --auto --left-of HDMI2 Graphic card VGA compatible controller: Intel Corporation Ivy Bridge Graphics Controller (rev 09)

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• Connection timed out on Node.js app running under CentOS

  - by ss1271

  I followed this tutorial to create a simple node.js app on my CentOS: the node.js version is: $ node -v v0.10.28 Here's my app.js: // Include http module, var http = require("http"), // And url module, which is very helpful in parsing request parameters. url = require("url"); // show message at console console.log('Node.js app is running.'); // Create the server. http.createServer(function (request, response) { request.resume(); // Attach listener on end event. request.on("end", function () { // Parse the request for arguments and store them in _get variable. // This function parses the url from request and returns object representation. var _get = url.parse(request.url, true).query; // Write headers to the response. response.writeHead(200, { 'Content-Type': 'text/plain' }); // Send data and end response. response.end('Here is your data: ' + _get['data']); }); // Listen on the 8080 port. }).listen(8080); However, when I uploaded this app onto my remote server (assume the address is 123.456.78.9), I couldn't get access to it on my browser http://123.456.78.9:8080/?data=123 The browser returned Error code: ERR_CONNECTION_TIMED_OUT. I tried the same app.js code which runs fine on my local machine, is there anything I am missing? I tried to ping the server and its address was reachable. Thanks.

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• Microsoft Excel not graphing

  - by SmartLemon

  Im not sure if this is a math question or a su question. The experiment was relating the period of one "bounce" when you hang a weight on a spring and let it bounce. I have this data here, one being mass and one being time. The time is an average of 5 trials, each one being and average of 20 bounces, to minimize human error. t 0.3049s 0.3982s 0.4838s 0.5572s 0.6219s 0.6804s 0.7362s 0.7811s 0.8328s 0.869s The mass is the mass that was used in each trial (they aren't going up in exact differences because each weight has a slight difference, nothing is perfect in the real world) m 50.59g 100.43g 150.25g 200.19g 250.89g 301.16g 351.28g 400.79g 450.43g 499.71g My problem is that I need to find the relationship between them, I know m = (k/4PI^2)*T^2 so I can work out k like that but we need to graph it. I can assume that the relationship is a sqrt relation, not sure on that one. But it appears to be the reverse of a square. Should it be 1/x^2 then? Either way my problem is still present, I have tried 1/x, 1/x^2, sqrt, x^2, none of them produce a straight line. The problem for SU is that when I go to graph the data on Excel I set the y axis data (which is the weights) and then when I go to set the x axis (which is the time) it just replaces the y axis with what I want to be the x axis, this is only happening when I have the sqrt of "m" as the y axis and I try to set the x axis as the time. The problem of math is that, am I even using the right thing? To get a straight line it would need to be x = y^1/2 right? I thought I was doing the right thing, it is what we were told to do. I'm just not getting anything that looks right.

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• ssh initial prompt hangs for 10 minutes but console login and initial prompt is very responsive - why?

  - by rfreytag

  I have been running an ESXi 4.0 server for months with a couple of WinServer2003 and several Ubuntu Server 10.4 VMs. The performance has been impressive on 6GB i7 Asus P6T hardware. Suddenly, a week ago, ssh logins to the Ubuntu VMs take 10 minutes when connecting over the LAN (over a WAN the connection (pipe) is broken long before that). When logging in to these VMs the password prompt arrives immediately, and failed passwords are responded to immediately. But the moment I log in then the shell prompt appears and I hang for many minutes. Sometimes the connection hangs before the shell prompt appears and sometimes I can type in a command but the moment I hit return the machine hangs. 10 full minute later control returns and the VM is responsive. NOTE: there are several Ubuntu VMs on the same host machine that are identical in all ways that I can tell. However, only one of the VMs displays this behavior. That is why I mention the ESXi host in passing - I don't think it has anything to do with the problem. This behavior is never seen when I connect with the troubled-VM's console (through vSphere Client). From the console the Ubuntu VMs all respond beautifully. I have seen: http://kb.vmware.com/selfservice/microsites/search.do?cmd=displayKC&docType=kc&externalId=1003496&sliceId=1&docTypeID=DT_KB_1_1&dialogID=229586372&stateId=1%200%20229588522 ...and since that relates to delays in seeing the password prompt that does not appear to be the solution here. Any other suggestions very welcome - thank you.

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• How to connect computers to a network printer behind a router?

  - by kokbira

  General question: How to connect computers to an IP printer behind a router? Particular question: How to connect C-1 and C-2 to PRI? What? Where? [ISP] | | -> IPs:200.X.X.X/other configs:DC | [R-1] | | -> IPs:10.1.X.X locked by MAC,M:255.0.0.0,G:10.1.0.1 |¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯| | | [PRI] IP:10.1.7.7 [R-2] IP: 10.1.0.1,MAC:A | | -> IPs:192.168.1.X,M:255.255.255.0,G:192.168.1.1 |¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯| | | [C-1] IP:192.168.1.2 [C-2] IP:192.168.1.3,MAC:A Glossary and details: ------------------------------------------------------------------------------------ - IP: IP. - IPs: Some IP range. - M: Mask. - G: Gateway. - MAC:A: A MAC address that I will not inform you :) - DC: Don't care. - ISP: Internet Service Provider (not so much details about it on that case). - R-1: A real router or some concatenated so IP range bellow that block is 10.1.X.X and above is ISP. The provided IPs are provided by MAC. As all available addresses are in use, you must clone an existing one to join with a new device (and to disconnect the cloned one). - PRI: An network printer (some people here call that IP printer). - R-2: A TP-LINK TL-WR340G, mine wireless router (since my computer does not have ethernet input, it is my ethernet-wifi adapter :), admin access, MAC address cloned from C-2 (MAC:A). I've to configure 10.0.1.1 and 10.0.1.2 as DNS addresses, other wise I cannot connect C-1 and C-2 to Internet. - C-1: My computer, a CCE XLE-425 (remember: no ethernet input), with Windows 7, admin access. - C-2: another computer with better configs than mine, MAC:A, Windows XP. Requirements: I want to print, to access Internet and to do it myself (no need to call network admin men in black people). Pay attention to MAC clones and DNS info.

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• nginx doesn't find the directory but apache does

  - by Jack Spairow

  I use apache as the backend server and nginx on the frontend. Apache listens to port 8080 and nginx to port 80. What I do is have the root point to the public folder foreach virtualhost: <VirtualHost *:8080> ServerAdmin webmaster@localhost ServerName site.com ServerAlias site.com *.site.com DocumentRoot /var/www/site.com/public <Directory /> Options FollowSymLinks AllowOverride None </Directory> <Directory /var/www/site.com/public/> Options Indexes FollowSymLinks MultiViews AllowOverride All Order allow,deny allow from all </Directory> </VirtualHost> And here's the nginx config: server { listen 80; access_log /var/log/nginx.access.log; error_log /var/log/nginx.error.log; root /var/www/site.com/public; index index.php index.html; server_name site.com *.site.com; location / { location / { proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $host; proxy_pass http://127.0.0.1:8080; proxy_cache one; proxy_cache_use_stale error timeout invalid_header updating; proxy_cache_key $scheme$host$request_uri; proxy_cache_valid 200 301 302 20m; proxy_cache_valid 404 1m; proxy_cache_valid any 15m; } } location ~ /\.(ht|git) { deny all; } } The problem is Apache resolves the domain just fine (site.com:8080), but nginx shows instead a 502 Bad Gateway (site.com:80). I tried looking at the error_log and access_log but I can't find any hint for why can't nginx work. EDIT: The problem was I wasn't able to include that isolated config for nginx.

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• What is the best hosting option for Flash web-widget?

  - by par

  Our Flash web-widget has got highly popular. It is downloaded around 100,000 times per day. And that is the problem. Our server bandwidth is too narrow to deliver the widget to the clients fast. The widget is loaded very slow. Probably 20 times slower than before (at peak times). Probably I have choosen not the right hoster for my task - delivering 1 MB Flash widget to 100,000 users per day. What is the best hosting solution in my case? I'm not good at server administration so forgive me if I sound naive. The details are the following. Our hoster options: -Dedicated server, Ubuntu -10 Mbit Connection -monthly bandwidth limit: 2000 GB Widget size is 1 MB. The widget consists of the main SWF and a number of loaded SWF and data files. This is a part of Apache Status report taken right now ---- Server uptime: 1 hour 2 minutes 38 seconds Total accesses: 74865 - Total Traffic: 5.8 GB CPU Usage: u28 s7.78 cu0 cs0 - .952% CPU load 19.9 requests/sec - 1.6 MB/second - 81.1 kB/request 200 requests currently being processed, 0 idle workers WWWWWWWWWWWWWWWWWWWWWWWWCWWWWWWWWWWWWWWWWWWWWWWWWWWCWWWWWWWCWWWW WWWWWCWWWWWWWWWWWWWWCWWWWWWWWWWWWCWWWWWWWWCWWCWWWWWWWWWWWWWWWWWW WWWWWWWWWWWWWWWWCWWWWWWWWWWWWWWWWWWWWWWWWWWWCWCWWWWWWWWWWWWWWWCW WWWWWWWW........................................................ ----

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• How to fix high Load_Cycle_Count laptop drive (TOSHIBA MK6006GAH in Vaio TX1XP)?

  - by Sam Brightman

  Hoping someone knows exactly what's going on here. It seems this drive has some combination of aggressive power saving settings and Ubuntu defaults that has massively increased the Load_Cycle_Count for the drive: https://wiki.ubuntu.com/DanielHahler/Bug59695 So the drive is now so slow that it cannot boot because it takes long enough to access the data that the kernel will not recognise it properly. I'm not worried about the data on the drive, but would really like to keep the laptop functioning. There is some indication that this is possible because the figure is still low 200,000s and most drives supposedly go to 600,000. Additionally, SMART tests pass and consider the drive healthy and without errors. But the really surprising thing was when I ran mhdd... Every single read came up red (slow) until I pressed 'R' for reset drive. I noticed the next read was normal speed, so held down 'R'. Magically the drive read perfectly for as long as I held the key BUT resumed slow (and noisy) seeking/reading after releasing. I don't think the source code to mhdd is available, so I'm not exactly sure what this means (besides, I don't know enough low-level HDD stuff either). It seems like the drive should be able to work, but is stuck trying to power save or something. There are no BIOS options on the laptop. Does anyone know how I can stop the drive from doing extremely slow/noisy operations like this? Or is constantly resetting the drive also damanging, and only causing it to work well by luck (i.e. not a suggestion that it's fixable)?

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• Why is only one Excel spreadsheet crippled, but others are fine?

  - by Dallas

  I have an inherited spreadsheet that I really don't want to rebuild at the moment. It's a simple small workbook that is small (< 200 rows that don't even reach to AA) and does nothing more than calculate some totals within the same worksheets. No macros, no external data sources, nothing beyond basic formatting of dates, numbers and strings. I see importing data from CSV/text has created many many workbook connections over time, but even if I delete them all (there were hundreds) it makes no difference in performance. Even clicking to simply change focus from cell to cell takes 10+ seconds, adorned by the spinning cursor and (Not Responding) appending to the title bar and the application locking up. The program seems to "recover" every time, but efficiency of editing this file is obviously seriously handicapped. All other files seem fine in Excel, and other programs have no apparent performance issues. I see Excel is chewing up CPU but I'm not sure how to narrow down what process or service is "clashing" with Excel. I tried the same file on other computers and performance is fine. If I turn off all start-up services and run only Excel, performance is restored... until I start using other programs and then it bogs down again. At this point, I would entertain almost any idea, theory or suggestion that helps pinpoint, solve or work around the issue.

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• Can varnish cache files without specific extension or residing in specific directory

  - by pataroulis

  I have a varnish installation to cache (MANY) images that my service serves. It is about 200 images of around 4k per second and varnish happily serves them according to the following rule: if (req.request == "GET" && req.url ~ "\.(css|gif|jpg|jpeg|bmp|png|ico|img|tga|wmf)$") { remove req.http.cookie; return(lookup); } Now, the thing is that I recently added another service on the same server that creates thumbnails to serve but it does not add a specific extension. The files are of the following filename pattern: http://www.example.com/thumbnails/date-of-thumbnail/xxxxxxxxx.xx where xx are numbers, so xxxxxxxxx.xx could be 6482364283.73 (two numbers at the end) (actually this is the timestamp so I can keep extra info in the filename) That has the side effect that varnish does not cache them and I see them constantly being served by apache itself. Even though I can change the format from now on to create thumbs ending in .jpg, is there a way to change the vcl file of my varnish daemon to either cache everything under a directory (the thumbnails directory) or everything with two numbers at its extension? Let me know if I can provide any additional info ! Thanks!

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• Script to mirror MS SQL Server databases between 2 servers

  - by David W

  Hi I have about 200 sites each of which have 2 servers running MSSQL (2k5 at some sites, 2k8 at others) One server is production and the other is primarily there as a backup. We're rebuilding all of these servers this year and as part of that we will have to set up mirroring for ... a lot ... of databases. Some of these sites have 45 databases so mirroring them manually is going to be a huge pain. I was going to write a batch script which uses SQLCMD to backup the database and log, copies to the secondary server, restores the backup and log with norecovery, creates the endpoints and sets the partner. This in itself isn't too complicated, but i'd love to see what other people have done as i'm not very confident in catching errors using the process i've outlined above. I've seen Tools to manage sql 2008 database mirroring? Which looks really good, but the formatting is jumbled and I can't get it to work. If anyone has any other scripts they've written and are willing to share I'd be eternally grateful. Ideally I'd love to be able to use a script to ensure there are matching endpoints (same ports) on both servers, backup the database, backup the log, copy the backups to second server, restore database and log with norecovery, set the partners on both servers, and somehow confirm that the databases are linked and synchronized. Well, thanks for reading :)

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• Customer site is out of IP addresses, they want to go from /24 to /12 netmask... Bad idea?

  - by ewwhite

  One of my client sites called to ask me to change the subnet masks of the Linux servers I manage there while they re-IP/change the netmask of their network based on a 10.0.0.x scheme. "Can you change the server netmasks from 255.255.255.0 to 255.240.0.0?" You mean, 255.255.240.0? "No, 255.240.0.0." Are you sure you need that many IP addresses? "Yeah, we never want to run out of IP addresses." A quick check against the Subnet Cheat Sheet shows: a 255.255.255.0 netmask, a /24 provides 256 hosts. It's clear to see that an organization can exhaust that number of IP addresses. a 255.240.0.0 netmask, a /12 provides 1,048,576 hosts. This is a small < 200-user site. I doubt that they'd allocate more than 400 IP addresses. I suggested something that provides fewer hosts, like a /22 or /21 (1024 and 2048 hosts, respectively), but was unable to give a specific reason against using the /12 subnet. Is there anything this customer should be concerned about? Are there any specific reasons they shouldn't use such an incredibly large mask in their environment?

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• Nginx server 301 Moved permanently

  - by user145714

  When I did a curl -v http://site-wordpress.com:81 I received this result: About to connect() to site-wordpress.com port 81 (#0) Trying ip... connected Connected to site-wordpress.com (ip) port 81 (#0) GET / HTTP/1.1 User-Agent: curl/7.19.7 (x86_64-unknown-linux-gnu) libcurl/7.19.7 NSS/3.12.6.2 zlib/1.2.3 libidn/1.18 libssh2/1.2.2 Host: site-wordpress.com:81 Accept: / < HTTP/1.1 301 Moved Permanently < Server: nginx/1.2.4 < Date: Fri, 16 Nov 2012 16:28:19 GMT < Content-Type: text/html; charset=UTF-8 < Transfer-Encoding: chunked < Connection: keep-alive < X-Pingback: The URL above/xmlrpc.php < Location: The URL above Seems like this line in my fastcgi_params is causing grief. fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; If I remove this line , I get HTTP/1.1 200 OK but I get a blank page. This is my config: server { listen 81; server_name site-wordpress.com; root /var/www/html/site; access_log /var/log/nginx/access.log; error_log /var/log/nginx/error.log; index index.php; if (!-e $request_filename){ rewrite ^(.*)$ /index.php break; } location ~ \.php$ { fastcgi_pass 127.0.0.1:9000; # port where FastCGI processes were spawned fastcgi_index index.php; include /etc/nginx/fastcgi_params; include /etc/nginx/mime.types; } location ~ \.css { add_header Content-Type text/css; } location ~ \.js { add_header Content-Type application/x-javascript; } } This config works with ip and port 80. But now I need to use a domain name and port 81, which doesn't work. Could someone please help. Thanks.

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• Optimizing Apache for large file serving

  - by D_Guy13

  I have a random problem with Apache that I can't quite figure out, here is my setup, Windows Server 2008 R2, 64 Bit, 5GB RAM, SSD with 200 MB(Read/write) and Dual Core CPU @ 2.1 GHz A dump from mod-staus, Server Version: Apache/2.4.7 (Win32) mod_limitipconn/0.24 mod_antiloris/0.5.2 PHP/5.5.9 Server MPM: WinNT Apache Lounge VC11 Server Built: Nov 21 2013 20:13:01 Current Time: Thursday, 21-Aug-2014 23:38:06 W. Europe Daylight Time Restart Time: Thursday, 21-Aug-2014 20:30:47 W. Europe Daylight Time Parent Server Config. Generation: 1 Parent Server MPM Generation: 1 Server uptime: 3 hours 7 minutes 18 seconds Server load: -1.00 -1.00 -1.00 Total accesses: 283025 - Total Traffic: 1172.2 GB 25.2 requests/sec - 106.8 MB/second - 4.2 MB/request 62 requests currently being processed, 388 idle workers Serving large .zip & iso files using mod_xsendfile. (File size range 500 MB - 1.5 GB) The setup works and is running fine. CPU usage is very unstable, jumps all the time between 10% - 90% and the servers goes down when it hits 100%. In that case I have to hard restart the server. Server it outputting traffic at 30 Mbps. Is there anything else I should think about to get a more stable CPU usage? Is that CPU usage normal? Can switching to Linux help me achieve better CPU usage?

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• Mac OS X - Time Machine backup fails verification - What can I do to save the history?

  - by usermac75

  Hi, How do I make Time Machine to make a new complete backup without losing older versions of backed up files? Verbose: I am using the Time Machine backup on my OS X (Snow Leopard) to backup the whole computer to an external drive. I especially like the "history", i.e. the feature that allows you to restore the older version of a file. Problem: I had some data corruption on my external backup drive, I repaired it with the System Tool for doing that, it found some faults. I had the disk tool repair the external drive. After that, the external drive was OK and I could use Time Machine again. I let Time Machine do one more backup. Now I made a verification according to http://superuser.com/questions/47628/verifying-time-machine-backups, namely along sudo diff -qr . $HOME/Desktop 2>&1 | tee $HOME/timemachine-diff.log However: After doing the command above, several differences and missing files were reported, approx. 200 files in sum. Whereas some of the missing files were cache or excluded directories, the differences do bother me, especially as some important documents from me are listed as differing. How can I make sure that the data on the external drive is synced correctly? Is it possible to have Time Machine to do a complete new backup without losing the history? Or to have Time Machine compare all files for differences and re-write all files that are different? Or can I set some flags on the files that do not match to have them copied again? (like the archive-flag in Windows/Dos). I'd rather not touch the files because I would like to keep the date of last change/date of creation) Thank you for your thoughts!

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