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• How can I change the amount and size of Linux ramdisks (/dev/ram0 - /dev/ram15)?

  - by Kevin S.

  Using Linux, when I boot I automatically have 16 16MB ramdisks, however, I would like to create one really large ramdisk to test some software. I found that I can adjust the size of the ramdisks already on the system with the kernel boot parameter ramdisk_size however, this makes all 16 ramdisks (/dev/ram0 - /dev/ram15) the size that is specified. So if I want to create a 1GB ramdisk, I would need 16GB of memory. Basically, I want to create one 10GB ramdisk which would be /dev/ram0. How would I go about doing that? I assume there is a kernel boot parameter, but I just haven't found it.

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• Hosts file in Apache keep changing for OS Linux Redhat [on hold]

  - by jack f

  I have installed Apache server. Two clients ex client_1 and client_2. The operation that we are performing on client_1 reflecting to client_2. We have etc/hosts file in our software install location which is keep on changing for client_2 with client_1 IP address. If I correct the entries in hosts file to client_2 also in the next few minuets it is changing automatically to the client_1(if we start the client_1 service). Please explain the use of hosts file and where and when it will change by Apache service. The hosts file in the location /etc/hosts/ for the both clients are same ============================================= Do not remove the following line, or various programs that require network functionality will fail. 127.0.0.1 localhost.localdomain localhost Local LAN 190.0.0.1 client_1.Example.com client_1 190.0.0.2 client_2.Example.com client_2 HR LAN 10.1.74.2 client_1hr peer 10.1.74.3 client_2hr ESP LAN 10.69.69.1 client_1esp 10.69.69.2 client_2esp Any help will be appreciated. Thanks in advance, Jack F

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• How can I incrementally backup a large amount of data [with rsync]?

  - by Annan

  A website contains ~40GB images + files which needs to be backed up. Rollbacks need to be possible daily for the last 30 days. And backup server < 1.2TB My idea is to have one full backup from 30 days ago, then incremental backups for the last 30 days. On each day the last incremental backup is combined with the full backup and a new incremental backup is added. Can this strategy be implemented with rsync, if so how? Are there any problems with this plan? A better plan? PS: Incremental backups, not backup incrementally (which rsync does automatically)

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• How to choose my own filename format for subscribed podcast files?

  - by user14068

  I subscribe to several podcasts where the filenames of the downloaded mp3 files have no particular pattern to them. When I copy the directory of accumulated mp3 files into my mp3 player, the files play in alphabetical order. What I really want is to play the files chronologically by release date. I currently use iTunes on Windows XP to download the files. What I do now is manually rename the files, adding the date in YYYYMMDD format to the start of each filename so that an alphabetical listing of files will correspond to their chronological order when I listen to them later in PocketTunes on my Palm Centro. Is there some way to get the release date into the filename automatically? If so, I could automate or possibly skip the file renaming step. I would switch from iTunes to something else if that would solve my problem. The file creation time on my local disk isn't a reliable indicator because sometimes I download a few days worth of content at one time, and the files don't necessarily get downloaded in chronological order.

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• Hosting a JEE application on my own server with custom domain

  - by Joro Seksa

  I have a website which purpose is to help people build routes and use various map tools. The site is all static with lots of javascript source files which do the logic. However i want to convert this site to a JEE application and host it on my own server with tomcat container. So lets say that the application hosted on my server can be accessed on address: xxx.xxx.xxx.xxx:8084/MyApp Now lets say my domain is www.my-domain.com The question is: Is it possible to be made when i enter www.my-domain.com in the browser to load automatically xxx.xxx.xxx.xxx:8084/MyApp

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• How can I import a CSV file into an SQLite table that doesn't allow null values?

  - by Philip

  I've been using the SQLite Manager extension for Firefox to edit my Chrome web data file in order to restore my keyword searches, and I think I have everything in place except that when I import a CSV file into a table, (a) it won't import into the actual table because the table doesn't allow null values (b) if I import it into a new table that does allow null values, then all the empty strings end up as null and I have to manually edit the row, type and delete a character, and then it's set to empty string and it's fine So: is there either a way to import the CSV so that empty cells are automatically turned into empty strings instead of null, OR is there a way once a table is imported that has null values to convert it into one that doesn't allow null values, where each formerly null value is the empty string? Thanks!

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• Taking two actions in monit

  - by Oddthinking

  My monit script works to detect an outage with a process and inform me when the rule is: IF DOES NOT EXIST THEN ALERT My monit script works to detect an outage and automatically fix it when the rule is: IF DOES NOT EXIST THEN START But, what I want it to do is inform me AND fix it. Two rules in a row seems to make it ignore all but the last: IF DOES NOT EXIST THEN ALERT IF DOES NOT EXIST THEN START # No alert given. I could use a custom script that does both, and IF DOES NOT EXIST THEN EXEC "my_handwritten_script" but I was trying to move away from a mess of hand-written scripts towards a clean Monit configuration. Can I configure Monit to take two actions?

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• Mysterious "media" volume mounted on desktop Mac OS X

  - by Allen

  I have a mysterious volume mounted on my desktop that I can't seem to forcibly unmount. I've tried using umount and also diskutil, but it seems to automatically remount itself. I've copied my hdd with Time Machine, and copied it onto a new computer, and it also has the drive mounted on it. It's not pointing to anything and I can't open it, nor can I forcibily remove it by hand with rm -Rf. Any ideas? I noticed this problem after I upgraded to Mountain Lion from Lion. It causes problems because when I try to select a file using the built in Finder dialog box, it freezes for a few minutes because it tries to cache or read into the "media" mounted volume.

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• phpMyAdmin logs out when selecting database

  - by deed02392

  I'm having an issue with pma whereby after logging in (as root or the database owner), and trying to switch to a certain database, I am automatically logged out. I cannot do any actions on the database and in the page that loads immediately before I'm logged out I note that I can't see any tables in the database. The database is accessible by the cli mysql program and all records are still present. To clarify: Literally login works fine, I can browse ALL databases except the one of my projects. Trying to use that database causes the phpMyAdmin session to end. Thanks!

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• Connect to a particular network connection from terminal

  - by RanRag

  I am currently using Reliance netconnect USB modem. The problem I am facing is my USB modem disconnects itself at 22:00 PM IST everyday. Now, sometimes what I do is start some downloading and leave my laptop for 2-3 hours in this case if my network disconnects it is a problem for me. So, what I used to do in windows is make a python script and execute rasdial myconnection_name to automate the connection process in my absence. Now I want to achieve something similar in linux. So, what are my alternatives for rasdial like tool in linux to automatically connect to a particular connection . I am using ubuntu 12.04 and here is my nm-tool output.

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• Is there a time machine equivalent for windows that can back up network files?

  - by Jim Thio

  This question is similar to Does an equivalent of Time Machine exist for Windows?, with one difference: The files I want to back up are on a network drive. The computer on that network drive is running Windows XP. I want to back up data on Windows 7. How would I do so? I'd like something similar to Mac OS X' time machine. So copy of data every hour, day, week. Then thinning out, data gets deleted automatically as time goes by. For example, the data for last day is kept as hourly snapshots. For last week, as daily snapshots every day. And for last month as weekly snapshots. How can I achieve this?

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• Choosing a monitoring system for a dynamically scaling environment: Nagios v. Zabbix

  - by wickett

  When operating in the cloud and scaling boxes automatically, there are certain monitoring issues that one experiences. Sometimes we might be monitoring 10 boxes and sometimes 100. The machines will scale up and down based on a demand. Right now, I think the best solution to this is to choose a monitoring solution that will instantiation of targets via calls to an API. But, is this really the best? I like the idea of dynamic discovery, but that is also a problem in the cloud seeing that the targets are not all in the same subnet. What monitoring solutions allow for a scaling environment like this? Zabbix currently has a draft API but I have been unable to fund a similar API for Nagios. Is there a similar API for Nagios? Anyone have any alternate suggestions besides Nagios and Zabbix?

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• IF Statement using dates for a budget template

  - by Leah Allen

  I am working on a budget and want to automatically account for increases in rent in the correct month, I would also like to account for dates tenants move in or out. I may also sometimes have a tenant in a space all year with no changes to rent. Below is an example of my budget with all three scenarios. SQFT BaseRentperSQft BaseRentIncrease DateofIncrease CommencementDate TermDate Jan-Decbymonth 10,000 $15.00 $15.25 05/01/2013 11/30/2013 10,000 $15.00 04/01/2013 10,000 $15.00 I would like to build a formula to accomplish all criteria. Thanks in advance, I can only write simple IF statements, this one is out of my league.

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• OS X: How to create a user account with access to the applications that she has installed only.

  - by pmurillo

  Till now, I've been the sole and proud owner of an iMac. I've always logged in as an administrator and I've also installed a bunch of software following the standard procedure of dragging and dropping it into the Applications folder. This is about to change, as sharing it with a friend makes a lot of sense now that I only have time to use the computer in the mornings, and she can only use it at nights. I thought this was going to be really easy: Just create a user account for her and that's all, I thought. Unfortunately, this is not the case. When she logins into the computer using her username and password, she has access to the same applications I've installed. Even the same applications that I setup to automatically start when I login start for her when she does. How can I setup a user that has only access to the applications that she has installed, but none of the ones installed by other users? Many thanks

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• Windows 7 - ICS - Xbox360

  - by Hailwood

  I am trying to connect my xbox360 to the internet through ICS using my laptop. I have done this a few days ago using the exact same hardware(so no hardware problems) The laptop can browse the internet. The laptop gets its settings though DHCP. I have enabled ICS on the Wireless connection (where the internet is coming from) I have set the xbox and the Wired connection on the laptop to obtain settings automatically. The issue is that the Wired connection only shows 'Unidentified Network'. What could i be doing wrong?

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• How can I stop ntbackup requiring my new password every time I'm forced to change my Windows passwor

  - by Lunatik

  I have a scheduled job that runs each night using ntbackup which copies a folder on my HDD to a network share. The problem is that every time I'm required to change my Windows password I have to remember to change it in ntbackup aswell, otherwise the backup fails silently i.e. I get no warning that the backup isn't being done. Is there a way to schedule this job so it will automatically pick up my new Windows password, or somehow not be tied to my main login? My user account type is Debugger, not full Administrator, so I'm not sure if that would restrict me in any way, e.g. still forcing a four-weekly password change on a dedicated user account for this. The PC runs XP SP2 on a Windows Server 2003 R2 domain.

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• How can I disable the network detection on Windows 7?

  - by Mad Scientist

  I have a computer running Windows 7 that shares some files on the network. This works fine for a while until for some unknown reason the computer decides that it is connected to a new, unknown public network and disables the file sharing capabilites. Nothing physically changes with the computer, it is still connected to the same network via ethernet cable. But it does misidentify the network every other day, just plugging out the ethernet cable and putting it back in leads Windows to correctly identify the work network and enabling the share again. Is there some way to stop Windows from trying to identify the network automatically, and just tell it that the network on that computer will never change?

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• Distributed filesystem for automated offline data mirroring

  - by Petr Pudlák

  I'd like to achieve the following setup: Every time I connect my laptop to a local network, my partition gets automatically mirrored to a partition on my local server. I only want to mirror what has changed from the last time. (I understand that it is not a proper backup solution since there is no history of the changes, it'd be more like a non-persistent network RAID.) Is there a distributed file system that allows such a setup? I've done some searching and it seems to me that most distributed file-systems are focused on data availability and distribution, not duplicating them. I'd be thankful for suggestions. Edit: Sorry, I forgot to mention: I'm using Linux.

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• Are Rackspace's Cloud Servers really cloud hosting?

  - by sopppas

  I may be confused about what cloud hosting really is... I asked Rackspace how its Cloud Server (CS) 256MB/10GB compares to Slicehost's 256slice VPS, and they said it's exactly the same (only different billing and BW). I know they are the same company. So, why do they call it Cloud Server? Isn't it just a collection of VPS (virtual private servers)? For me, cloud hosting would be: if I need any additional horsepower at any given time, the cloud would automatically stack more VPS and then charge me at the end of the month for the surplus of resources. Reading Rackspace's info, it looks like it's for me to decide when to stack more CS and that its Cloud Servers don't AUTOMATICLY scale up. Am I confusing things?

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• what to use instead of laptop-mode?

  - by playcat

  hello, i have ubuntu 10.10 64bit on hp 6735s (turion processor). it overheats, and i'm forced to use turion power control in order to keep core temperature to a reasonable level. one more measure that i use is putting my processors to conservative mode. that way, i'm perfectly happy with its performance, and heat is where it should be. however, after my latest upgrade, something happened - cores are back to ondemand by default, and i'm not sure if turionpowercontrol is working any more (ps axu | grep urion shows no process). in addition, i read somewhere that laptop-mode uses hdd spindown for preserving data/energy, and that hdds have only a limited amount of those spindowns, so laptop-mode usage can actually shorten the life of my hdd. i'm wondering if there is a good way to set my cores to automatically go to conservative mode? also, what's the good way to see what is the voltage my cores use? on windows i use cpuz tools. thx and sorry for the long explanation.

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• Seeing DNS changes takes too long on my PC, can it be my router misconfiguration?

  - by Borek

  I administer a few sites and need to update their DNS entries from time to time, e.g., adding an A-record point certain subdomain to a certain IP. When I check sites like http://www.opendns.com/support/cache/, I can clearly see the DNS change taking effect throughout the world - is it just my PC that can't see this change (ping newsubdomain.example.org says it cannot resolve host name) The network "map" is like this: My PC -> my router -> my ISP's router -> internet On my PC, the DNS is set automatically which means that if I run iconfig /all, my router will be returned as the DNS server (192.168.1.1). On my router, the DNS is set to be what my ISP provided me with. Is this correct? What can I do to see new hostnames resolved quicker?

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• Show Excel column filter information in cells

  - by Alex

  We have a sheet with a huge number of columns and filtering is often used to navigate to the correct data. The problem is that sometimes its not obvious that the filter has been applied , the visual cue is very subtle. Is it possible to show some data via a formula or VBA about the filter inside another cell? Something like this: Just knowing if the filter is active would be a good help, knowing what columns have active filters applied to them would be icing on the cake. Ideally they update automatically. I dont have ownership of the spreadsheet so cant make major changes to its structure or anything but VBA is fine. Any ideas?

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• Ubuntu Studio 10.4 boots to terminal mode only

  - by Don

  I did clean install from ISO DVD. It boots only to command line asking for login. After I login I enter STARTX and desktop appears and some of the studd actually works, but there are a lot of problems: there is no way to reboot or shut down except to stopx/logoff and enter shutdown sound system doesn't respond pulse audio volume control gives "connection failed, connection refused" DVD drives not available GDebi Package installer is grayed out and so I can't use it (but synaptic package manager works OK) Software Center won't start when clicked -- it just stops trying DBus cant run because it says /usr/local/var/run/dbus/system_bus_socket file not found (also /var/run/dbus/system_bus_socket file not found) There's just a lot of things wrong and I can't help but think something is missing or was mis-coded in the distro so that there are typos in some script somewhere. If anyone can tell me where to begin to untangle this mess I'd appreciate it, but I think it all begins when it can't start the GUI automatically and I need to enter STARTX.

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• Automatic subdomain creation in htaccess on Apache

  - by ANOther8660

  I have a domain in my HOSTS file; www.mytestbusiness.com However, I want to convert some folders into subdomains automatically, e.g. www.mytestbusiness.com/birmingham www.mytestbusiness.com/london which should be: www.birmingham.mytestbusiness.com www.london.mytestbusiness.com Only for some folders do I want to keep it as a domain/folder link, e.g. www.mytestbusiness.com/styles/ I don't want the CSS folder becoming a subdomain, or certain folders like cgi-bin, dwoo etc. (dwoo contains the site templates!) I am running Apache 2.2 on Windows 7 Home Edition, and the site has no issues, it's just creating subdomains in .htaccess without having to manually declare them which is the problem. What's the best way to do this, other than manually declaring them in httpd-vhosts.conf as I used to do? Thanks

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• Public Wi-Fi and software updates

  - by coding4fun

  According to Microsoft, "Never update your software on a public Internet connection." So I have some questions. 1. What if a public Wi-Fi hotspot is the only Internet available, ever? Never update anything? 2. What happens if Windows or some other program is set to update automatically and attempts to do so while you are using a public Wi-Fi? Disable all automatic updates on all software? 3. Will VPN help to secure software updates? If so, how to go about it? Thanks.

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