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• Separate the multiple ipv6 addresses

  - by Ruriko

  I have a vps that comes with 16 ipv6. I used one of the addresses and I tried testing the proxy at http://ipv6-test.com/ but it detected that is using the first ipv6 adddress instead of the certain ipv6 address that I provided. Example I used 2607:f358:0001:fed5:0022:772f:6ed3:7f3c as my proxy but it detected as 2607:f358:0001:fed5:0022:0000:db61:85e1 . Why is it doing that? The proxy server I am using is polipo

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• How should I implement simple caches with concurrency on Redis?

  - by solublefish

  Background I have a 2-tier web service - just my app server and an RDBMS. I want to move to a pool of identical app servers behind a load balancer. I currently cache a bunch of objects in-process. I hope to move them to a shared Redis. I have a dozen or so caches of simple, small-sized business objects. For example, I have a set of Foos. Each Foo has a unique FooId and an OwnerId. One "owner" may own multiple Foos. In a traditional RDBMS this is just a table with an index on the PK FooId and one on OwnerId. I'm caching this in one process simply: Dictionary<int,Foo> _cacheFooById; Dictionary<int,HashSet<int>> _indexFooIdsByOwnerId; Reads come straight from here, and writes go here and to the RDBMS. I usually have this invariant: "For a given group [say by OwnerId], the whole group is in cache or none of it is." So when I cache miss on a Foo, I pull that Foo and all the owner's other Foos from the RDBMS. Updates make sure to keep the index up to date and respect the invariant. When an owner calls GetMyFoos I never have to worry that some are cached and some aren't. What I did already The first/simplest answer seems to be to use plain ol' SET and GET with a composite key and json value: SET( "ServiceCache:Foo:" + theFoo.Id, JsonSerialize(theFoo)); I later decided I liked: HSET( "ServiceCache:Foo", theFoo.FooId, JsonSerialize(theFoo)); That lets me get all the values in one cache as HVALS. It also felt right - I'm literally moving hashtables to Redis, so perhaps my top-level items should be hashes. This works to first order. If my high-level code is like: UpdateCache(myFoo); AddToIndex(myFoo); That translates into: HSET ("ServiceCache:Foo", theFoo.FooId, JsonSerialize(theFoo)); var myFoos = JsonDeserialize( HGET ("ServiceCache:FooIndex", theFoo.OwnerId) ); myFoos.Add(theFoo.OwnerId); HSET ("ServiceCache:FooIndex", theFoo.OwnerId, JsonSerialize(myFoos)); However, this is broken in two ways. Two concurrent operations can read/modify/write at the same time. The latter "wins" the final HSET and the former's index update is lost. Another operation could read the index in between the first and second lines. It would miss a Foo that it should find. So how do I index properly? I think I could use a Redis set instead of a json-encoded value for the index. That would solve part of the problem since the "add-to-index-if-not-already-present" would be atomic. I also read about using MULTI as a "transaction" but it doesn't seem like it does what I want. Am I right that I can't really MULTI; HGET; {update}; HSET; EXEC since it doesn't even do the HGET before I issue the EXEC? I also read about using WATCH and MULTI for optimistic concurrency, then retrying on failure. But WATCH only works on top-level keys. So it's back to SET/GET instead of HSET/HGET. And now I need a new index-like-thing to support getting all the values in a given cache. If I understand it right, I can combine all these things to do the job. Something like: while(!succeeded) { WATCH( "ServiceCache:Foo:" + theFoo.FooId ); WATCH( "ServiceCache:FooIndexByOwner:" + theFoo.OwnerId ); WATCH( "ServiceCache:FooIndexAll" ); MULTI(); SET ("ServiceCache:Foo:" + theFoo.FooId, JsonSerialize(theFoo)); SADD ("ServiceCache:FooIndexByOwner:" + theFoo.OwnerId, theFoo.FooId); SADD ("ServiceCache:FooIndexAll", theFoo.FooId); EXEC(); //TODO somehow set succeeded properly } Finally I'd have to translate this pseudocode into real code depending how my client library uses WATCH/MULTI/EXEC; it looks like they need some sort of context to hook them together. All in all this seems like a lot of complexity for what has to be a very common case; I can't help but think there's a better, smarter, Redis-ish way to do things that I'm just not seeing. How do I lock properly? Even if I had no indexes, there's still a (probably rare) race condition. A: HGET - cache miss B: HGET - cache miss A: SELECT B: SELECT A: HSET C: HGET - cache hit C: UPDATE C: HSET B: HSET ** this is stale data that's clobbering C's update. Note that C could just be a really-fast A. Again I think WATCH, MULTI, retry would work, but... ick. I know in some places people use special Redis keys as locks for other objects. Is that a reasonable approach here? Should those be top-level keys like ServiceCache:FooLocks:{Id} or ServiceCache:Locks:Foo:{Id}? Or make a separate hash for them - ServiceCache:Locks with subkeys Foo:{Id}, or ServiceCache:Locks:Foo with subkeys {Id} ? How would I work around abandoned locks, say if a transaction (or a whole server) crashes while "holding" the lock?

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• nginx + apache subdomain redirection fault

  - by webwolf

  i really need your advice folks since i'm experiencing some troubles with nginx & apache2 subdomains configs first of all, there's a site (say, site.com) and two subdomains (links.site.com and shop.site.com) whose files are physically located at the same level of FS hierarchy as the site.com itself my hoster has configured both apache and nginx by my request, but it still doesn't work as it used to both of subdomains point to the main page of site.com for some unknown and implicit (for me) reason :( my assumption is that's happen because site.com record is placed first in both configs?!.. please help me solve this out! every opinion would be appreciated =) nginx.conf: server { listen 95.169.187.234:80; server_name site.com www.site.com ; access_log /home/www/site.com/logs/nginx.access.log main; location ~* ^.+\.(jpeg|jpg|gif|png|ico|css|zip|tgz|gz|rar|bz2|doc|xls|exe|pdf|ppt|txt|tar|mid|midi|wav|bmp|rtf|js|swf|avi|mp3|mpg|mpeg|asf|vmw)$ { expires 30d; root /home/www/site.com/www; } #error_page 404 /404.html; # redirect server error pages to the static page /50x.html # error_page 500 502 503 504 /50x.html; location = /50x.html { root html; } # deny access to .htaccess files, if Apache's document root # concurs with nginx's one # location ~ /\.ht { deny all; } location / { set $referer $http_referer; proxy_pass http://127.0.0.1:8080/; proxy_redirect off; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Referer $referer; proxy_set_header Host $host; client_max_body_size 10m; client_body_buffer_size 64k; proxy_connect_timeout 90; proxy_send_timeout 90; proxy_read_timeout 90; proxy_buffer_size 4k; proxy_buffers 4 32k; proxy_busy_buffers_size 64k; proxy_temp_file_write_size 64k; } } server { listen 95.169.187.234:80; server_name links.site.com www.links.site.com ; access_log /home/www/links.site.com/logs/nginx.access.log main; location ~* ^.+\.(jpeg|jpg|gif|png|ico|css|zip|tgz|gz|rar|bz2|doc|xls|exe|pdf|ppt|txt|tar|mid|midi|wav|bmp|rtf|js|swf|avi|mp3|mpg|mpeg|asf|vmw)$ { expires 30d; root /home/www/links.site.com/www; } #error_page 404 /404.html; # redirect server error pages to the static page /50x.html # error_page 500 502 503 504 /50x.html; location = /50x.html { root html; } # deny access to .htaccess files, if Apache's document root # concurs with nginx's one # location ~ /\.ht { deny all; } location / { set $referer $http_referer; proxy_pass http://127.0.0.1:8080/; proxy_redirect off; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Referer $referer; proxy_set_header Host $host; client_max_body_size 10m; client_body_buffer_size 64k; proxy_connect_timeout 90; proxy_send_timeout 90; proxy_read_timeout 90; proxy_buffer_size 4k; proxy_buffers 4 32k; proxy_busy_buffers_size 64k; proxy_temp_file_write_size 64k; } } server { listen 95.169.187.234:80; server_name shop.site.com www.shop.site.com ; access_log /home/www/shop.site.com/logs/nginx.access.log main; location ~* ^.+\.(jpeg|jpg|gif|png|ico|css|zip|tgz|gz|rar|bz2|doc|xls|exe|pdf|ppt|txt|tar|mid|midi|wav|bmp|rtf|js|swf|avi|mp3|mpg|mpeg|asf|vmw)$ { expires 30d; root /home/www/shop.site.com/www; } #error_page 404 /404.html; # redirect server error pages to the static page /50x.html # error_page 500 502 503 504 /50x.html; location = /50x.html { root html; } # deny access to .htaccess files, if Apache's document root # concurs with nginx's one # location ~ /\.ht { deny all; } location / { set $referer $http_referer; proxy_pass http://127.0.0.1:8080/; proxy_redirect off; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Referer $referer; proxy_set_header Host $host; client_max_body_size 10m; client_body_buffer_size 64k; proxy_connect_timeout 90; proxy_send_timeout 90; proxy_read_timeout 90; proxy_buffer_size 4k; proxy_buffers 4 32k; proxy_busy_buffers_size 64k; proxy_temp_file_write_size 64k; } } httpd.conf: # ServerRoot "/usr/local/apache2" PidFile /var/run/httpd.pid Timeout 300 KeepAlive On MaxKeepAliveRequests 100 KeepAliveTimeout 15 Listen 127.0.0.1:8080 NameVirtualHost 127.0.0.1:8080 ... #Listen *:80 NameVirtualHost *:80 ServerName www.site.com ServerAlias site.com UseCanonicalName Off CustomLog /home/www/site.com/logs/custom_log combined ErrorLog /home/www/site.com/logs/error_log DocumentRoot /home/www/site.com/www AllowOverride All Options +FollowSymLinks Options -MultiViews Options -Indexes Options Includes Order allow,deny Allow from all DirectoryIndex index.html index.htm index.php ServerName www.links.site.com ServerAlias links.site.com UseCanonicalName Off CustomLog /home/www/links.site.com/logs/custom_log combined ErrorLog /home/www/links.site.com/logs/error_log DocumentRoot /home/www/links.site.com/www AllowOverride All Options +FollowSymLinks Options -MultiViews Options -Indexes Options Includes Order allow,deny Allow from all DirectoryIndex index.html index.htm index.php ServerName www.shop.site.com ServerAlias shop.site.com UseCanonicalName Off CustomLog /home/www/shop.site.com/logs/custom_log combined ErrorLog /home/www/shop.site.com/logs/error_log DocumentRoot /home/www/shop.site.com/www AllowOverride All Options +FollowSymLinks Options -MultiViews Options -Indexes Options Includes Order allow,deny Allow from all DirectoryIndex index.html index.htm index.php # if DSO load module first: LoadModule rpaf_module modules/mod_rpaf-2.0.so RPAFenable On RPAFsethostname On RPAFproxy_ips 127.0.0.1 RPAFheader X-Forwarded-For Include conf/virthost/*.conf

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• Diagnosing iMac Hardware?

  - by Covar

  Recently my first generation Intel iMac that I've had since 2006 has begun to lock up and restart on me. Before I run off and spend $1500-$2000 on a new iMac, is there any good way to diagnose the hardware? I would like to know exactly what is going wrong so I know I won't be wasting my money when there is an easier fix.

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• How can I roll back 1 commit?

  - by n179911

  I have 2 commits that I did not push: $ git status # On branch master # Your branch is ahead of 'faves/master' by 2 commits. How can I roll back my first one (the oldest one), but keep the second one? $ git log commit 3368e1c5b8a47135a34169c885e8dd5ba01af5bb ... commit baf8d5e7da9e41fcd37d63ae9483ee0b10bfac8e ... From here: http://friendfeed.com/harijay/742631ff/git-question-how-do-i-rollback-commit-just-want Do I just need to do: git reset --hard baf8d5e7da9e41fcd37d63ae9483ee0b10bfac8e That is?

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• Get results by name in Excel 2010

  - by Tom

  I need to parse through the data below and show results like: Mary notready=483 training=452 break=30 I have the formulas — what I'm having trouble with is: The names are first, then 7 to 10 rows of data and what I need is some kind of array that will pull 1st Break_100 under that name, even though they are in different rows. Mary Summary: 08:02:32 () 9/19/2012 Not_Ready_Default_Reason_Code 00:00:05 Training_3000 07:32:21 Break_1000 00:30:06 daily 9/19/2012 08:02:32 Agent: 08:02:32 Dan Summary: 01:18:33 () 9/19/2012 Break_1000 00:34:27 Not_Ready_Default_Reason_Code 00:01:37 Personal_4000 00:42:29 daily 9/19/2012 01:18:33 Agent: 01:18:33

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• Removing folders from sycn parternships in Windows 7

  - by KE.

  A while back I set my computer up to sync folders on a shared network drive. I didn't choose my folders carefully and ended up with a huge amount of files to sync, which took forever. I would like to stop sync on those folders, then later select some smaller subfolders to sync. I believe this means I first must delete the existing sync partnerships, but there is no "Delete" option when I list them in Sync Center. How can I delete existing sync partnerships?

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• error: no such partition

  - by Carwyn

  So i just recently installed Ubuntu Linux 10.04 on my desktop machine alongside Windows 7, it booted just fine the first few times but after i went into my windows 7 recovery software provided by packard bell( i did this on accident BTW i exited it straight away and made no changes as far as i know) and re-booted i get this screen: error: no such partition grub rescue_ PS: i installed it on a USB stick using the ISO on the official ubuntu website.

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• How can I tell who deleted a folder from a public share?

  - by wizard

  Like a lot of offices we have a few public shares for different teams to save their data. Today I helped someone restore some folders from a shadow copy that had been deleted sometime last week. While I had the shadow copies (and backups elsewhere), I couldn't answer the obvious first question. "Who deleted the files?" We're running Windows 2003 server, everyone has active directory accounts.

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• Remotely Administer Workgroup Computers

  - by Steven

  At work, I can remotely administer other computers by first adding my domain account as a local admistrator on another computer. After that, I can use remote registry, computer management, and file sharing (\\computer\c$). How can I setup a remote user to be a local administrator on a simple home network without a domain (just a workgroup)?

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• Change directory upwards to specified goal

  - by haakon

  I'm often deep inside a directory tree, moving upwards and downwards to perform various tasks. Is there anything more efficient than going 'cd ../../../..'? I was thinking something along the lines of this: If I'm in /foo/bar/baz/qux/quux/corge/grault and want to go to /foo/bar/baz, I want to do something like 'cdto baz'. I can write some bash script for this, but I'd first like to know if it already exists in some form.

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• Websites that introduce new stuff [closed]

  - by user33929

  Are there any blogs/websites that introduce new funny/fancy websites or new tech (software/hardware)? I am talking about sites that may introduce digg.com, superuser.com, mint.com or delicious.com when these site first come out. I am also looking for sites that introduce new handy/useful 3rd party applications/tools. Thanks.

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• Automatic sort for excel worksheet

  - by Joseph

  I want to create a to-do list in Excel that automatically sorts the to-do entries in a list, in order of ones to do first (closest deadlines). I would also like a section that shows the tasks for today and another for high-priority tasks coming up within a week. I have not programmed in Excel before. I know Python and JavaScript, but want an Excel solution that runs inside Excel (maybe using VBA, the Excel programming language). Is this sort of thing possible in Excel?

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• Unable to install some applications on windows 7 64 bit (These files can't be opened error)

  - by rzlines

  I get the following error when I try to install some application on my windows 7 64 bit system. How do I turn this off as I know that the applications that I'm installing are trusted. I have turned off windows defender and tried to tweak internet explorer security settings according to the first few google results but yet I have the same error. (I also created a new user account and tried importing new registry keys but nothing even then) How can I solve this?

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• Two bilbiographies in Word

  - by Jan Aagaard

  Is it possible to have two bibliographies in Word 2007? I want to use the first one as a reference list to external references and the second one to be a list of my own appendices.

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• Why are the cntrl and fn key swapped in a Thinkpad?

  - by Daud

  Just used a Thinkpad for the first time ever. Weird stuff happening. Why?

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• Windows 7 booting and startup repair issues

  - by aardvark

  I have a MSI FR720 laptop with Windows 7 and Lubuntu partions. For quite a while (6 months or so) I've been having issues booting from my hard drive, it'd take me between 5 minutes and several hours for me to be able to have it recognize the hard drive as a bootable device. I did several disk checks on it, and my hard drive seems in perfect condition, and the fact that booting would usually only work after removing the hard drive and trying to reset it in its slot or lightly shaking it makes me think it had something to do with the connection in the hard drive slot as opposed to the hard drive itself. I was having particular issues with it detecting the hard drive today so I decided to try booting it from an external hard drive dock. It detected it first try and so far has had no problems finding the bootable partitions on my hard drive. When I selected my Windows 7 partition from the boot menu it said that it hadn't been shut down properly last time and needed startup repair. I've done this several times over the last 6 months, so this is hardly unusual. I do startup repair, it fails, and then I try to do a system restore. The system restore also failed, and it says that no files were changed. I restart and try it again. However, this time when I get to the startup repair it's not detecting a Windows OS. I tried clicking next and doing a startup repair but the repair is always failing. If I ignore the startup repair option and instead select "Launch windows normally" it will get to the windows animation, stop halfway through and then crash into a BSoD. I can't read the error on the screen because it immediately switches to back and tries to restart. This is my first time asking a question like this online, so let me know if I need to provide any extra information and I'll do my best to give it I tried using diskpart to find the list of partitions and see if one's labelled as an active partition, but it says that no disk were detected. I can run Lubuntu just fine. I can also see all of my Windows 7 files from it EDIT: The startup repair diagnosis and repair log is this: -- Number of repair attempts: 1 Session details System Disk = Windows directory = AutoChk Run = 0 Number of root causes = 1 Test Performed: Name: Check for updates Result: Completed successfully. Error code = 0x0 Time taken = 15ms Test Performed: Name: System disk test Result: Completed successfully. Error code = 0x0 Time taken = 31ms Root cause found. If a hard disk is installed, it is not responding. -- Any chance that this is a result of me doing this through an external dock through a USB drive?

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• Include most recent non empty column value in filter

  - by Domenic

  If my data looks like this: Category Sub Category 1 a b 2 c d Which shows that there are two categories: "1", which has sub categories "a" and "b", and "2", which has sub categories "c" and "d". What can I do in excel (for filtering/sorting) to keep rows 1 and 2 together as category "1", instead of the first row as category "1", and the second as category ""? I'm trying to avoid having to do this: Category Sub Category 1 a 1 b 2 c 2 d

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• Do something by operator dial specified number in Asterisk?

  - by Rev

  I want to make ability for Asterisk phone Operators to able do something like this: While operator talking to caller, if Operator dial specified number like 244 (or something like that but not Sip-Userid's), do something (like play sound for caller or etc) for that call. So, Is this possible? Is need to change dialplan? ¦¦¦¦¦ I found this. in first paragraph it's say someething like: if operator dial exten go voiceMail.

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• Is there an ld-linux.so equivalent for mac?

  - by Matt

  I'm using the following command on Linux to change the default library path temporarily for the program being run: /lib64/ld-linux-x86-64.so.2 --library-path /home/me/libs./myProgram This runs myProgram and makes it check /home/me/libs first for its dynamically linked libraries. So I want to do this on Mac too.. is there an equivalent? I'd like to avoid setting environment variables if possible.

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• How do I recover JPEGs with no file size?

  - by Jill

  I downloaded some wedding photos into my external drive about a month ago. A total of 3 cards were downloaded into 3 different files. The first file lists all of the photos, about 600 images, but they have zero bytes. The other 2 files are fine. I can't recover the compact flash card because I have used it too many times since then. Is there any way to recover the images on my drive?

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• get username from active directory in C#.net [closed]

  - by Jahangeer Ahmed

  get username from active directory in C#.net ManagementObjectSearcher Usersearcher = new ManagementObjectSearcher("Select * From Win32_ComputerSystem"); ManagementObjectCollection Usercollection = Usersearcher.Get(); string[] sep = { "\" }; string[] UserNameDomain = Usercollection.Cast().First()["UserName"].ToString().Split(sep, StringSplitOptions.None); null reference exception

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• ERROR: snapshot_root must be a full path

  - by Patrick

  I want to use rsnapshot to make backups of some folders on a remote server. I've already setup Key Based Authentication, and I've specified in rsnapshot.conf: snapshot_root [email protected]/ however I get the following error: ERROR: snapshot_root snapshot_root [email protected]/ - snapshot_root \ must be a full path So I was wondering if the only way is to mount first the remote server and how (I'm on Ubuntu 9.04) thanks

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• How to remove a non-empty directory which is not owned by the user in Linux?

  - by Alex B

  If a directory "foo" is owned by user A and contains a directory "bar", which is owned by root, user A can simply remove it with rmdir, which is logical, because "foo" is writable by user A. But if the directory "bar" contains another root-owned file, the directory can't be removed, because files in it must be removed first, so it becomes empty. But "bar" itself is not writable, so it's not possible to remove files in it. Is there a way around it? Or, convince me otherwise why it's necessary.

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• What video format works both on Windows and all Apple products out-of-the-box?

  - by Seppo Silaste

  What format and encoding should I use for video that would play out-of-the-box on both Windows and all Apple products (iPad, iPhone, etc.)? I know that the correct way to render an animation, is to first render it as images, but this is overkill when rendering short animations of a work in progress for the client to comment on. I have one client that views the vids on Windows and another that views them on iPad and iPhone. I'm hoping I could render just one video instead of rendering in two different formats.

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