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• Can I lvreduce after lvextend without losing the ext4 partition inside it?

  - by DrSAR

  In a botched attempt to move my root partition from one disk to another I have done the following: added new disk partitioned it with parted (part #3 is now almost totally filling the disk) initialized a physical volume $ pvcreate /dev/sdb3 Physical volume "/dev/sdb3" successfully created extended the volume group to include this new physical disk $ vgextend myvg /dev/sdb3 Volume group "myvg" successfully extended extended the logical volume (I think this is where I ballsed it up: I think I should have pvmove'ed stuff to the new pv in that group - can someone confirm?) $ lvextend /dev/mapper/myvg-root /dev/sdb3 I would now like to undo the lvextend and then proceed with the original plan of moving the content of the old physical volume over to the new physical volume. Can I reduce the logical volume (I have not yet touched the ext4 partition that sits in /dev/mapper/myvg-root with something like resizefs) without fear of damaging the ext4 filesystem? If so, how do I tell it to reduce by exactly the right amount? $ lvreduce --by-exactly-the-amount-occupied-by-PV /ev/sdb3 /dev/mapper/myvg-root

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• How can i simulate the production servers in my home for linux VMs [closed]

  - by user31

  I am thinking of making the small simulation of how the big companies run their system in my home environment to get the feeling. I have the server with 8GB ram , quad core processor. I am thinking of following setup if thats [possible because i have not worked with biger companies , so i want to know how can i do that I am thinking of creating 5 virtual machines VM1 will be database server and will have all databases like MySQL , postgreSQL , sqlite , mongodb and Oracle VM2 will be the web server and will have Apache and Tomcat installed VM3 will be the Filse server where i will have all the web sites file VM4 , i am thinking of as main box where i can install ptyon php java j2ee sites but not sure VM5 will have the server 22008 for c# .net applications my main idea is to be able to host the sites in php, python , java j2ee with spring Is my setup ok or i am missing few things. Please guide me with correct setup so that i can learn stuff

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• Java and Sendmail HELO requires domain address

  - by ealgestorm

  I am trying to set up emailing from a java web application hosted on a linux server (Cent OS) in apache. Sendmail is working fine from the command line as root on localhost but when trying to send emails from the java web app (also on the same server from localhost) the following java exception is thrown. 501 5.0.0 HELO requires domain address EDIT: I have read that some people have found this is due to an incorrect hosts entry currently the hosts file contains 127.0.0.1 Centos-VPS localhost.localdomain localhost and i'm not sure what the Centos-VPS bit at the start is for but this is a clients hosted server so don't really want to break stuff EDIT see the RFC is helpful ... 501 Syntax error in parameters or arguments Now I know what the problem is! (note the sarcasm people.)

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• MongoDB PHP EC2 Setup Configuration

  - by nathansizemore

  I am new to web development and server set up. I am looking for some advice or a link to a tutorial on setting up a production system up. Right now, I have a server (Ubuntu, Apache, MongoDB, and PHP). It receives a request, PHP queries Mongo, and PHP sends out the requested data. How do I make that work with more servers? I've read that you can make a cluster of a primary and two slave nodes which work as separate servers running Mongo, but do those also run PHP? Or is the primary the only one running the PHP? I have read some docs on Mongo site and a video of someone from 10gen going through it, but they are geared towards people that seem to already understand this stuff, I have no idea and need to start from a beginning stage. If anyone can help me understand where PHP (Acting as my API) lives in these clusters, that would be greatly appreciated! Thanks in advance for any help!

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• Moving the home directory to a new drive

  - by Mellowcandle

  I have no more space left on my hard-drive. So I bought a new one and I would like this hard-drive to be the home folder. I thought of copying all the stuff I have on the home folder to the hard-drive partition. and creating a symbolic-link from ~ to there. The problem I have is that I can't really delete the home folder while I'm logged in as the current user. Is there a way to log out, and log in as root in Linux Mint? I want to be able to do this without a live-CD solution.

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• Are there any tutorials on web hosting at home? [closed]

  - by Arturs Lapins

  I want to host at home and I have done it before but I want to setup a server not just hosting on my windows 7. I know the risks and its better to just buy from hosting providers etc. I'm interested to host at home and I can't find any okay tutorial using unix, ubuntu server or whatever is the best. I want to see how you can install your mail server and make it work on your host and also ftp and all that interesting stuff. You people got any links or what?

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• Recommended laptops for system admins?

  - by 80skeys

  Hey all - I'm in the market for a new laptop and wanted to get some recommendations. I'm a Linux sysadmin and this laptop is primarily for work related use, working from home, after hours, occasional trips to the data center, etc. We all know the drill. My typical setup includes various utilities and tools plus multiple partitions for booting different OS's including VMware. Need serial port of course, DVD-RW, and all the usual stuff we use in our daily routine. I'm kinda thinking a Thinkpad T510 but open to other suggestions! Brief explanation of why you suggest some particular brand and configuration is appreciated.

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• Web-Server directory permissions

  - by MLS

  Hello All, I would like some help understanding web-server directory permissions. Apache, CentOS, PHP, Mysql Example, I have multiple sites in /var/www/html They are in paths like: /var/www/html/www_domainname_com inside each site I might have a path like /lib/mysql/ like PHP connect stuff, database config, etc. What should me permissions be so that someone cannot just browse to that directory? Should I just .htaccess them? I have apache:apache as the owner of all my web directories. Can I prevent someone from crawling certain directories of my web-server? I have a robots.txt, but what is to say the crawler obeys it? So to sum up: 1. What is the best owner/permission set for my sensitive files that the web-server or php or mysql needs, but I dont want people browsing to? Can I prevent straight out crawling of portions?

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• How can I log the response header and body in apache?

  - by acme

  I need to determine whether the server (Apache 2) is returning the full contents of a page along with its correct header or not. I have a PHP-script that is executed successfully, but the browser is getting only half of the html content, it's simply cut off. The client infrastructure is pretty complicated, using Novell BorderManager Proxys and stuff. To ensure the server is doing its job fine I want to log both header and body of the reponse. How can I achieve this? I looked into the mod_log_config module of apache (which is already installed and ready to be used), but honestly I didn't quite manage to configure it to output header and body somewhere. edit: I managed to log the header with LogFormat "%h %l %u %t \"%r\" %s %b \"%{HEADER_NAME}o\"" common2 CustomLog /var/log/apache2/response.log common2 But unfortunately the mod_log_config formats don't support the whole content body. Can anyone help?

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• which mail server is better suited for high volume? [closed]

  - by crashintoty

  I'm planning out a project (web/mobile app) that would require a mail server that could handle hundreds of thousands connections per hour (both IMAP/POP and SMTP) and has the ability to interface with PHP (or python or whatever) to dynamically create, delete and check for mailboxes? This is not for spam stuff, I just need my app to generate random mailboxes (and static/permanent ones too) to receive mail and process it for items listed on my service. The little research I've done so far has turned up courier, dovecot, cyrus and haraka. I think the ability to scale and/or load balance (I'm new to these terms, pardon me) would also be a requirement. Any ideas?

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• Comparing outgoing mail options, self hosted VS google apps in my situation

  - by Hoofamon

  I am setting up a small site that has the need to be able to programmatically send mail from time to time. Password resets and things like that. I'm already using google apps to handle my domains email, so now i'm left with the decision between setting up basic SMTP services on my server to send "password reset mails and things like that" OR instead to have the software use google apps to send mail. I like the google apps option as it's less stuff to worry about and seems to fit my needs, i'm trying to figure out what the downsides would be? Thanks for any thoughts

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• tomcat processParameters complains about "invalid chunk ignored"

  - by cgicgi

  I am hosting a software system running under tomcat for quite a number of customers. Some of these send invalid URLs as request. These URLs may contain "&=" or "&&", which is not within the http specs. Now my tomcat complains about the following: "08.09.2010 12:36:04 org.apache.tomcat.util.http.Parameters processParameters WARNING: Parameters: Invalid chunk '' ignored." It is no problem, as is doesn't affect the operation in any way. Only problem ist that the tomcat/logs/catalina.out is growing with every single request. In the net you can find suggestions like: - Fix your URLs (which I can't, as it is the customers who send them) - Raise tomcats log level to ERROR (which I don't want to do, as it would suppress INFO like "INFO: Reloading context [/ContextName]" and other stuff you want to know. - Redirect the log to the application log (which won't solve the problem, as the message will flood just another log) Does anyone know how to solve the problem at its ROOT, which means: Tell tomcat not to complain about invalid request parameters any longer

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• Can't connect to localhost via browser. Can ping localhost.

  - by Sceptre

  I'm trying to connect to localhost through my browser to learn some apache tomcat stuff. When I tried to connect to localhost through Firefox, I couldn't; when I tried through IE, I could the first time, but not after that. I'm using Windows 7, and changed the hosts file to point localhost to 127.0.0.1. I can successfully ping localhost and 127.0.0.1. I have tried turning off my antivirus and my Windows Firewall, but to no avail. What am I doing wrong?

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• Hardware advice for bitmap / openGL image processing server?

  - by pdizz

  I am trying to work out a build for a processing server to handle bitmap processing as well as openGL rendering for chroma-keying images and Photoshop automation. My searches here and on Google have turned up surprisingly few results, and seeing that there aren't tags for bitmap or image processing I take it this is a specialized application. The bitmap processing is very cpu-intensive while the chroma-keying and Photoshop stuff is gpu-intensive. I doubt this is a case of over-optimization as our company batches thousands of images a day (currently on individual workstations) and any saving in processing time and workstation down-time would be beneficial. Does anyone have any experience with this type of processing server? Any special considerations that would go into a build like this or am I over-thinking it?

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• Roaming Profile to act as a redirected folder? Dropbox in roaming profile is also causing slow login/logou

  - by user147069

  As title, what I'm wondering to know is .. if the roaming profile with Windows 2008 R2 Server (I'm talking about V2 profile - Windows7/Windows8) can work as a redirected folder (it can be done with the Desktop, Contacts, Download, AppData, My Documents). The roaming profile is copied at each login (server - client) and at each logout (client - server). This is causing slow login and logout for huge roaming profile. I can't stop the usage of roaming profile since the environment is a School with 1000 users. But I have big issues with users who populate the profile path (which is mapped on "User's File" under Windows7/8) with other stuff than the already redirected Desktop and My Document. A typical problem is given by the Dropbox folder... Any solution?

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• Which free open source CPanel and WHM alternatives do you recommend/use?

  - by Keyframe

  I have been using webmin for some time now, however I miss the elegance and ease of WHM/CPanel combo I've had on shared hosting (and later dedicated hosting) platform. Looking around the web, all I have found that is somewhat at the level of WHM/CPanel was webmin - but WHM/CPanel it is not. Since I'm using this only for our projects, it doesn't matter in the end really. However, we do put our new customers on our servers too, so some sort of CPanel might be an easier thing for them to cope with (mostly going about Email accounts stuff and such). Currently my stack is LAMP (CentOS and Ubuntu Server - several machines, probably ditching CentOS soon in favor of Ubuntu). There is a prospect of Python/Django instead of PHP, but it might take awhile.

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• Books or other materials to overcome Linux learning curve?

  - by Marek Osvald

  I was born in 1989 and am an active Windows user since 1993. I've always struggled with Linux, not being able to configure the system the way I would like, snooping through blogs and forums for answers, never actually overcame the barrier. The books I've seen and read are either completely command line oriented (and don't get me wrong it's awesome to know this stuff when you're working on a server for example) but seems rather impractical to me on a desktop computer that's partially my development environment. The other kind are user manual describing step-by-step the controls of simplest applications like the Calculator, totally useless to me. What would you recommend for a programmer who needs to learn how to work with Linux but already knows the basics? What materials did you use to learn how to start with Linux?

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• Network Bypass - PC Registration Page - I'm trying to bypass a college Registration Page so I can ac

  - by Kamron3

  What I'm trying to do: Connect to the internet without registering But! Here's my problem: I can't connect. I used to be able to, now when I try to connect it says "Server not found." I can connect just fine on my other Laptop. I did a test as well. I used a LAN USB adapter and could connect fine, then now I can't connect again. Possibly because I am using uTorrent to download stuff, but I want to connect again Is there anyway I can use some sort of "virtual adapter"-type of connection where it masks my actual adapter? How can I connect to the connection without having to buy more and more Network USB Adapters? Thanks much!

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• Router for Infrastructure Network

  - by amfortas

  We have an HPC operation that down the years has grown to several racks of gear at three sites, hooked up via Gigabit fiber and Catalyst 2960s (we control the links and switches). Thus far all machines have been on a flat RCF1918 10/8 but we are looking to segment the network in order to streamline matters for iSCSI and generally keep infrastructure equipment away from our end-users. We have now reached a point where we need to consider introducing VLANs for specific subnets and are wondering if it would be worthwhile in the longer run to acquire a small router to keep to keep track of all this stuff and cut down on the complexity of netmasks and routes on host machines, etc. Has anyone here had a similar experience? Suggestions as to suitable equipment would be welcome.

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• Tricking Linux apps about current time with environment variables

  - by geek

  Sometimes it is possible to trick a Linux app by calling it like this: HOME=/tmp/foo myapp This would make myapp think /tmp/foo is the home directory, it won't try to get the user id, find its home directory via getpwent(). This is useful when myapp must be forced to dump some of its config files into a non-standard location different than ~. A similar trick can be done like this: LANG=foo LC_ALL=bar myapp This is useful when myapp needs to be called once with a different locale without having to make the change persistent by using the export bash built-in or even modify stuff in /etc/profile. Is it possible to pull the same trick with time and date? The goal is to make an app use another time than the system ones. The final goal - to make timestamps that appear in logs/commit messages not being tied to the system time.

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• Is it bad to put your computer in sleep mode every time?

  - by Ivo Flipse

  Often I have a lot of stuff open and don't feel like shutting down my laptop, so I just use sleep mode when I'm transferring it. But I have no idea if this might have any disadvantages. So my question is: is it bad to put your computer in sleep mode every time? Things I'm wondering: Should I turn off my computer every once in a while? Will continuous use of sleep mode slow down my system in any way? Are there any bad side effects (in the long term)? Any thoughts? FYI I'm using Windows 7 on a laptop

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• What VMWare should I choose?

  - by wbad

  I'm new to VMWare stuff. What I need to do is pretty basic: Just to install two different Windows 2008 versions on a server with 2x 4core CPU and 2x 3TB hard disks. I asked my datacenter to install the free version (VMware ESXi 4.1) but apparently it did not recognize 3TB disks. Now I'm wondering whether VMWare 5 can handle 3TB disks, and if so, what variant? There is a huge array of options there and some prices are astonishingly high: http://www.vmware.com/products/datacenter-virtualization/vsphere/pricing.html So I'm really confused and I appreciate your hints.

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• Impossible do find motherboard drivers to and old Dell computer

  - by Masziej

  Hello, I recently formatet and reinstalled XP on my girlfriends computer. Ive had this computer since 2001, never formatet it, until now =) Anyway the problem is that i cant find any drivers for the motherboard (integrated audio, video and ethernet). as i said its an old ass Dell. Cant remember if I got any cds along with it. Even if i did theyre gone a long time ago. So, I ran CPUZ and got this: --Motherboard-- Dell Computer Corp. 0K8980 And started googling. But didnt find any drivers. Still cant So im asking for a little help here. I really need to get the computer going before she wants a new one :D And yes i have looked on dells homesite, but they dont seem to wanna host drivers for their old stuff

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• Moving an "all-in-one" PC when turned on/off

  - by Purak

  I have an "all-in-one" pc. I know that moving a pc when it is switched on is harmful to the hardware components. What I would like to know is if the same applies to "all-in-one" pc's and if the same applies to regularly moving it from one side of the room to the other when it is turned off! The reason for the question is that I work on one desk during the day, and in the evening move it to the couch so I can do other stuff while watching TV or something. I always turn it off before the move, but somebody told me that I can be damaging the machine by doing so. Can anybody shed some light on this? Many thanks

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• How do I enable subfolders in Dovecot?

  - by yarun can

  In the past I was able to drag and drop my folder with subfolders (local emails) into my imap accounts inside Thunderbird. Now I moved to my own vps and its running Dovecot. So far so good with emails. Today I wanted to copy some folders with messages again but I realized that it does not let me copy to folders. I can drag and drop individual emails into some folders in Imap however folders stuff does not work. I am not sure what this feature is called. The previous email servers might be using some other imap server so I am really not sure what it might be even called. Is this a Dovecot or Thundenbird thing? If it is a Dovecot feature how I enable it on my server? Dovecot is running on Debian Wheezy 64 bit vps thanks

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