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  • iptables redirect single website traffic to port 8080

    - by Luke John Southard
    My goal is to be able to make a connection to one, and only one, website through a proxy. Everything else should be dropped. I have been able to do this successfully without a proxy with this code: ./iptables -I INPUT 1 -i lo -j ACCEPT ./iptabels -A OUTPUT -p udp --dport 53 -j ACCEPT ./iptables -A OUTPUT -p tcp -d www.website.com --dport 80 -j ACCEPT ./iptables -A INPUT -m conntrack --cstate ESTABLISHED,RELATED -j ACCEPT ./iptables -P INPUT DROP ./iptables -P OUTPUT DROP How could I do the same thing except redirect the traffic to port 8080 somewhere? I've been trying to redirect in the PREROUTING chain in the nat table. I'm unsure if this is the proper place to do that tho. Thanks for your help!

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  • Teaming/Spanning Switch Ports

    - by KTech
    I like to team NICs on my servers. Since most workstations are giga-bit anymore I want to provide my servers a bit more bandwidth. I've read various things that say I am/am not supposed to bond the ports on the switch. I see benefit in doing it as I'm not sure how the switch ARP table handles the same MAC address on multiple ports. Suggestions on the "ideal" way to do it? If it matters, I have mix (various locations) of Dell and HP, web managed, Layer 2 switches. Servers are mostly Dell with Broadcom NICs.

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  • Regular expression in mySQL [migrated]

    - by Rayne
    I have a mysql table that has 2 columns - Column 1 contains a string value, and Column 2 contains the number of times that string value occurred. I'm trying to find the string abc.X.def, where the beginning of the string is "abc.", followed by one or more characters, then the string ".def". There could be more characters following ".def". How can I find such strings, then add the occurrence of such strings and display the results? For example, if I have abc.111.def23 1 abc.111.def 2 abc.22.def444 1 abc.111.def 1 Then I will get abc.111.def23 1 abc.111.def 3 abc.22.def444 1 Thank you.

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  • What is excessive swapping.

    - by amateur barista
    This post led me to ask that question. Cache contention On a large site, if you are using MyISAM, contention occurs in the database tables when the cache is forced to clear after a node or a comment is added. With tens of thousands of filter text snippets needing to be deleted, the table will be locked for a long period, and any accesses to it will be queued pending the purge of the data in it. The same is true for the page cache as well. This often causes a "site hang" for a minute or two. During that time new requests keep piling up, and if you do not have the MaxClients parameter in Apache setup correctly, the system can go into thrashing because of excessive swapping.

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  • Matching users based on a series of questions

    - by SeanWM
    I'm trying to figure out a way to match users based on specific personality traits. Each trait will have its own category. I figure in my user table I'll add a column for each category: id name cat1 cat2 cat3 1 Sean ? ? ? 2 Other ? ? ? Let's say I ask each user 3 questions in each category. For each question, you can answer one of the following: No, Maybe, Yes How would I calculate one number based off the answers in those 3 questions that would hold a value I can compare other users to? I was thinking having some sort of weight. Like: No -> 0 Maybe -> 1 Yes -> 2 Then doing some sort of meaningful calculation. I want to end up with something like this so I can query the users and find who matches close: id name cat1 cat2 cat3 1 Sean 4 5 1 2 Other 1 2 5 In the situation above, the users don't really match. I'd want to match with someone with a +1 or -1 of my score in each category. I'm not a math guy so I'm just looking for some ideas to get me started.

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  • Can I control Caption sequence numbering from styles other than "Heading "?

    - by Carl Witthoft
    Similar question to Wrong caption using 'Appendix' header style , so the answer may well be "I can't." I created a style called "Appendix" which is based on "Heading 1" , is at "level 1" , and is numbered A,B,C... . I use the standard "Insert Caption" to get Figure or Table captions. I then modded the first field code to be STYLEREF "Appendix" \s and that properly displays the Appendix letter sequence. However, the second field code, SEQ \s 1 refers to the last "Heading 1" . I've tried things like SEQ \s "Appendix" to no avail. Is there any way around this? Should I generate a new "Appendix caption"-ish style which is a "numbered list" and manually set the 'restart at 1' counting in each Appendix?

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  • Using the RadTransitionControl in Task-It

    Download Source Code NOTE: To run the source code provided your will need to update to the RC (release candidate) versions of Silverlight 4 and VisualStudio 2010.  In a recent Ask the Experts webinar I showed a simple solution that had similarities to one that I had used in my recent MVVM post, but had a few extra twists on it. I have since been asked if I could post the source code for this demo, so here it is (I am using similar techniques in my Task-It application). The database Before running the code for this app you will need to create the database. First, create a database called MVVMProject in SQL Server, then run MVVMProject.sql in the MVVMProjectDemo/Database directory of your downloaded .zip file. This should give you a Task table with 3 records in it. You will also need to update the connection string in web.config to point to your database ...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Hard drive partition size wrong. How do I resize without loss of data?

    - by BreezyChick89
    $ fsck fsck from util-linux 2.20.1 e2fsck 1.42 (29-Nov-2011) The filesystem size (according to the superblock) is 610471680 blocks The physical size of the device is 536870911 blocks Either the superblock or the partition table is likely to be corrupt! It should be 1 partition but it now shows 2.2tb partitioned and .3tb unpartitioned How do I make the first partition correctly be 2.5tb without destroying whatever is in either partition? I did not raid or anything. My devices have been getting repeatedly corrupt by thunderstorms. Looks like people recommend doing something like in other places. sudo resize2fs /dev/sdc1 610471680

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  • Is there anyway that I can set the 'real' memory usage value while running my java code?

    - by vira
    I'm running a code on a server to generate a 10,000x10,000 matrix and save each value into a table (MySQL). I was informed by the administrator that I can use up to 32g of the physical memory of our server but have no idea how to do it. I googling around and so far only found information about setting the virtual memory using -Xmx. I tried it anyway and using top command I got this: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 3981 gv 35 15 32.4g 304m 10m S 1 0.5 9:54.84 java So, it shows that the -Xmx set the VIRT and not the RES value. Is there anyway that I can set the RES value into 32g?

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  • How to insert a list of data files(described in CSV file) from client location into database using PHP programming?

    - by Golam Mustafa
    We have some DVD. Each of them contain ---A CSV file containing some information about the documents. ---The list of pdf file(Scanned document). Example of CSV file Title,Author,FileName Design Document 0455, Eric Clipton,ds0455.pdf Tesign Document 0511,Johanson E,td0511.pdf I want to write PHP code that would read the CSV file , insert each information to database table as record. Can anybody help me to provide any idea about ---- How to select individual file from the client location on the basis of file name in the CSV file using PHP script. Thanks Golam

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  • How can I solve Windows PPTP VPN issues?

    - by Robin M
    I'm having persistent problems with Windows PPTP VPN connections. The VPN appears up whilst the tunnel won't transfer traffic (ping to a remote IP within the VPN works for a while, and then fails). The client receives routing information via DHCP. When the connection fails, the routing table is still correct so I don't think it's a routing problem. My internet connection is via an ADSL2 line. There's software to deal with PPTP problems, like TunnelRat, but I don't want to install v1.1 of the .NET framework and I'd rather get to the bottom of the problem (I have multiple VPN connections and some are more unreliable than others). What can I do to get to the bottom of this? Alternatively, what can I do to keep the connection alive?

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  • Laptop connectd to 2 VPNs (1st for Internet over WiFi, 2nd to access shared folders on another network) is failing to route traffic over 2nd VPN

    - by Triynko
    I set up a VPN on Windows Server 2008 through its routing and remote access services. I connected to the VPN, and configured the client to allow for split tunneling (Internet traffic goes to my default gateway, and traffic directed to the VPN server goes through the VPN gateway). I had to adjust the routing table, adding an entry to ensure traffic to my VPN server goes through the tunnel by running the command "route add [VPN.IP] mask 255.255.255.255 [VPN.GATEWAY.IP] IF [VPN_INTERFACE_#]". Adding the correct route makes everything work flawlessly on all my machines, except for one. The problematic machine is a laptop that's not directly connected to a network. It connects to WiFi, and then connects to a VPN to obtain internet access. Finally, it connects to the target VPN server for file sharing. The "route add" trick doesn't work for that laptop, I'm assuming because it's connected to two VPNs, and I'm getting the routing wrong. Can anyone familiar with routing explain what routes I may need to add?

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  • how to communicate in typical router switch router scenario?

    - by Kossel
    I'm learning routing using packet tracer simulation and I think this is a very commun scenario: let's say pc4 is the server... why I can't ping from PC1 to 192.168.2.253 (router1) but I can ping 192.168.2.2 (pc0) aren't they the same subnet? what am I missing or have to do in order to reach pc4? (192.168.100.254) from pc 1 (192.168.1.1) is there something like "default gateway" for router? thanks for advice PS: during the simulation it shows error "The routing table does not have a route to the destination IP address. The router drops the packe (from 192.168.2.253 to 192.168.1.1)"

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  • How should I implement Transaction database EJB 3.0

    - by JamesBoyZ
    In the CustomerTransactions entity, I have the following field to record what the customer bought: @ManyToMany private List<Item> listOfItemsBought; When I think more about this field, there's a chance it may not work because merchants are allowed to change item's information (e.g. price, discount, etc...). Hence, this field will not be able to record what the customer actually bought when the transaction occurred. At the moment, I can only think of 2 ways to make it work. I will record the transaction details into a String field. I feel that this way would be messy if I need to extract some information about the transaction later on. Whenever the merchant changes an item's information, I will not update directly to that item's fields. Instead, I will create another new item with all the new information and keep the old item untouched. I feel that this way is better because I can easily extract information about the transaction later on. However, the bad side is that my Item table may contain a lot of rows. I'd be very grateful if someone could give me an advice on how I should tackle this problem. UPDATE: I'd like to add more information about the current design. public class Customer implements Serializable { @OneToMany private List<CustomerTransactions> listOfTransactions; } public class CustomerTransactions implements Serializable { @ManyToMany private List<Item> listOfItemsBought; } public class Merchant implements Serializable { @OneToMany private List<Item> listOfSellingItems; }

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  • Is the console command cd a wildcard of sorts? [closed]

    - by Spiritios
    I was wondering while developing some application (though this is not a development question) if the cd command used in Windows is a wildcard or cross-platform command of sorts. I looked up on table with comands for Unix/Linux and MAC OS X and it turns out that it seems to be there. I am not a multi-os user, so I ask if anyone with experience in different OSes can tell me: If this command really exists and works If it has the same functionality (change directory) If there are any problems with its use If in any OS there is another command-line command that does the same in a better/more elaborate/more frequetly used way. Thanks in advance! (P.S.I am not 100% sure if this question belongs to this site or some other stackexchange site...) (P.P.S Any help in tagging this will be appreciated!)

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  • Is there a postfix mysql virtual_maps append_at_origin workaround so I can pipe to external scripts?

    - by FilmJ
    I am using virtual domains, and I'd like to setup the server to alias to custom scripts. I manage all accounts using postfix mappings to mysql. It seems that postfix automatically appends a virtual domain regardless of how the forwarded/aliased result comes back. So even though i have: "|/bin/command" postfix is reading it as: "|/bin/command"@mydomain.com Is there any work-around, or setting I can fix? It would seem than append_at_myorigin=no would be ideal, but that's unsupported according to the documentation. Another option, maybe I can skip virtual aliases altogether and use the "/etc/postfix/aliases" table - assuming all emails go to the main domain. I'll try this, but if anyone has any other ideas how to make it work with virtual domains, please let me know as this would be very useful! Thanks.

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  • Mirrored servers in data centers nationwide -- how?

    - by Sysadmin Evstar
    Mirrored servers in data centers nationwide -- how? I flunked my IT interview by getting this question wrong. I thought that in the various metropolitan areas, an "http://google.com" request goes to the ISP's DNS server, which somehow returns an IP address for one of several geographically-nearby http servers, and then something internally rolls over to the next available local Google server. But then, I could not explain where the table of available local Google servers is actually cached, or the details of the IP address rollover. Or how they could manually take some server out of the rotation, from anywhere. So, what should I be reading now so I can ace this question next time? Also, what daemons run on these machines 24/7 to keep all those mirrored database disks synchronized?

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  • Mirrored servers in data centers nationwide -- how?

    - by Sysadmin Evstar
    I flubbed my IT interview with Google by getting this question wrong. I thought that in the various metropolitan areas, an "http://google.com" request went to a local DNS server in a geographically nearby datacenter, which then returned an IP address for just one of several nearby http servers, which then rollover'd to the next local server, and I could not explain how or where the nationwide DNS kept its table of the available local servers cached, or how such a rollover happened. Or how they could manually take some server out of rotation, from anywhere. Fail. So, which Wikipedia page should I be looking at now so I can ace this question next time? And, what daemons run on these machines 24/7 to keep the mirrored database disks synchronized?

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  • Remove MySQL ibdata1 without dumping and restoring existing proper databases

    - by Halfgaar
    My MySQL server contains two 100+ GB big databases. One was created with innodb_file_per_table and one wasn't. The one that wasn't, has been dumped, ready to be reloaded. However, the ibdata1 file is still huge and I don't have enough free space. Normal advice in this situation is to dump and remove each database, stop MySQL, then remove ibdata1 and the transaction logs, and then reload the databases. My specific question is: can I leave databases that were created with innodb_file_per_table alone? Or will they be destroyed when I remove ibdata1, even though all their files are separate? I can't afford to take this database off-line to dump and reload it. And because it's already properly made with separate files per table, it would feel pretty useless.

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  • PHP / Drupal equivalent of .bat file [closed]

    - by Pamela
    I am new to Drupal and have just started in Drupal 7. I have a very simple .bat file that calls a .txt file to open a ftp connection, get a file off the ftp server and place it on my desktop. Now that I know that works.. (YAY!) I need to figure out how to have it done with a cron job in Drupal, save it somewhere so that I can unzip it somehow and then populate a table in the database with it. Any advice would be greatly appreciated!

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  • SSL encryption standards by browser

    - by hfidgen
    Hiya, Does anyone have a table of the default levels of encryption which the various browsers out there support? For instance I know that IE5 and lower struggle even to cope with 40 bit encryption but the latest browsers easily do 256 and beyond. The reason I ask is that I'm looking to get a wildcard certificate for my domain and the price difference is huge between a server gated certificate (where it enforces a minimum of 128bit) and a non-gated certificate (where the browser sets the encryption level). Obviously I like the idea of paying £300 less for the non-gated certificate, but only if I can be sure that the majority of my users (FF3 / Opera / Chrome / IE7+) are going to get good encryption.

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  • How to control routes added by RasDial

    - by Robert Dodier
    I am using the RasDial function on a Windows box (Windows Server 2008) to dial a device from which the server then reads data. It seems that some new routes are added to the network routing table when the dial-up connection is made. That interferes with other network interfaces on the server. In particular, RasDial adds a default route which routes traffic to the device, which makes the server unreachable until the connection is dropped. Is there a way to control which routes are added by RasDial? I have been studying Microsoft's document for RasDial and associated items (RASDIALPARAMS, RASDIALEXTENSIONS) without finding anything about routing. There is an option for "Use default gateway on remote network" when configuring a VPN, but I don't see how to apply that in this case. Thanks for any light you can shed on this problem.

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  • Searching for online database software/cms

    - by ButterdBread
    I am searching for a software or CMS that manages and displays large online databases, as some kind of frontend to MySQL or any other database. It should be accessible through the browser, be as secure as possible (offering login). The data I'd like to store would be personal information such as name, adress and birthday - also I'd need to be able to add custom fields as well. Also forms and the possibility to download the data in an excel? table would be great. PHPmyadmin is not an option, it should be similar to a CRM but more closely adapted to managing database tables, searching for entries and filtering data. It should be possible to have many user accounts with different rights, with each of them being able to acces certain parts of the data and entering own data. Is there something out there, that might get close to what I imagine? I appreciate any help!

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  • Flash Player is creating thousands of .tmp files

    - by Ed Manet
    We have seen a number of machines in our environment (XP Pro SP3) that have been running out of disk space because of .TMP files in the windows\temp folder. One machine had 6GB of .TMP files on it starting from around August 2010. The files are all 305kb in size and they seem to get created every 10 minutes. The files appear to be either .EXEs or .DLLs when opened in a hex editor. The words "this program can not be run in DOS mode" are at the beginning of the file and the words "Adobe Flash Player" are scattered all over the end of the file (probably the string table). While it's easy enough to clean them up, I'd like to find root cause for the issue. Has anybody else seen this?

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  • At what point does caching become necessary for a web application?

    - by Zaemz
    I'm considering the architecture for a web application. It's going to be a single page application that updates itself whenever the user selects different information on several forms that are available that are on the page. I was thinking that it shouldn't be good to rely on the user's browser to correctly interpret the information and update the view, so I'll send the user's choices to the server, and then get the data, send it back to the browser, and update the view. There's a table with 10,000 or so rows in a MySQL database that's going to be accessed pretty often, like once every 5-30 seconds for each user. I'm expecting 200-300 concurrent users at one time. I've read that a well designed relational database with simple queries are nothing for a RDBMS to handle, really, but I would still like to keep things quick for the client. Should this even be a concern for me at the moment? At what point would it be helpful to start using a separate caching service like Memcached or Redis, or would it even be necessary? I know that MySQL caches popular queries and the results, would this suffice?

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