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• how to properly edit hosts, hostname and resolf.conf?

  - by Firewall

  i,v been searching the internet for a real noop tutorial on the subject but could not found any direct info. on how to edit these files the proper way. i,v got a debian internet server that i use to host some personal domains and runs squid and rTorrent. the server is up and running with no problems but i am confused about a few things. lets say that i named my server (foo), my domain is (example.com) and my public IP is 95.211.133.200 now: should /etc/hostname contains: tango.example.com or tango <----- just the server name should /etc/hosts contains: 127.0.0.1 localhost.localdomain localhost 95.211.133.200 foo.example.com foo should /etc/resolf.conf contains (along with the nameservers) both: domain example.com search example.com or just the first one. are there any other files that i should edit in order to make things right? last thing, the command: domainname returns: (none) i believe it should return (example.com). what should i do to correct that?

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• Hadoop Rolling Small files

  - by Arenstar

  I am running Hadoop on a project and need a suggestion. Generally by default Hadoop has a "block size" of around 64mb.. There is also a suggestion to not use many/small files.. I am currently having very very very small files being put into HDFS due to the application design of flume.. The problem is, that Hadoop <= 0.20 cannot append to files, whereby i have too many files for my map-reduce to function efficiently.. There must be a correct way to simply roll/merge roughly 100 files into one.. Therefore Hadoop is effectively reading 1 large file instead of 10 Any Suggestions??

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• What kind of issues would occur if resolve.conf had no dns servers set?

  - by Stuart Woodward

  I want to create a server for a customer and have that customer finish the configuration for themselves. It was been decided that rather than setting default DNS servers (i.e. something like Google's) that the customer should enter the information by themselves. I assume that the customer is technically competent enough to do this. If however they forget or neglect to set this up they might spend some time trying to figure out what is wrong and eventually contact support. (In this case, I think that setting a default might have been better.) Apart from the obvious inability to resolve hosts, what other issues might they face until they have set valid dns servers in resolve.conf?

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• Recommendations for a PDF reader with "web browser"-like navigation.

  - by Tshepang

  Am looking for a PDF reader that can navigate PDF files like a web browser (IE, when I click a link that takes me to another part of the doc, I should be able to go back by pressing Ctrl+left arrow). I am using Debian.

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• DHCP server inside a virtual machine can't see other machines

  - by William

  Hi, I setup a private network from virtual machines and one of the machines is the DHCP server for the group. I want to specify a next-server for the DHCP server but I'm having trouble connecting to any of the machines that I lease IPs to. I'm just trying to do a simple ping/ssh to 10.0.0.252 (a machine with a lease) but it doesn't seem to respond. Any advice? I'm assuming I need to be able to connect to my next-server but maybe I'm wrong. Thanks.

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• Xorg configuration file on Debian Testing

  - by nubicurio

  I cannot find the Xorg configuration file on my newly installed Debian on my tablet-pc, so I followed this tutorial http://wiki.debian.org/Xorg and ran the command "Xorg -configure", to which I got the following error messages: (EE) Failed to load module "vmwgfx" (module does not exist, 0) (EE) vmware: Please ignore the above warnings about not being able to load module/driver vmwgfx (++) Using config file: "/root/xorg.conf.new" (==) Using system config directory "/usr/share/X11/xorg.conf.d" FATAL: Module fbcon not found. Number of created screens does not match number of detected devices. Configuration failed. Dose anyone know what this means and how I should proceed? Why is there a warning about vmware, and what is this fbcon module?

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• Free Hosting control panel

  - by John Maxim

  Hello All, I'm in the mid of researching for one of the best hosting control panels. The server I run is Ubuntu and I have some experience with ISPConfig 2 & 3. Since I haven't explored any others available, what are the recommended ones for an Ubuntu server? I asked because I find that there seems to be some disabling and modifications required for an Ubuntu server if I need to use ispconfig which causes the server to change its actual way of running. It's quite good though, but any more recommended ones ? Something more organic? which doesn't require much breaking and changing. I'm not asking for the simple one, I don't mind going extra mile to install a powerful one but just try sticking with most Ubuntu's conventions will be an ideal one for me. And of course, if there happens to be something that meets the requirement as mentioned "Ubuntu conventions" and also simple to install at the same time, that'd be a bonus. Thanks in advance.

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• Mark packets across computers?

  - by eudemo

  I use Transmission on Ubuntu and I'm having this issue, which basically says that QoS is broken because there is no way to limit which outgoing ports uses. I was thinking of doing a dirty and ugly hack and create an interface alias and define QoS based on source address, but was wondering if is there another way. Is it possible to mark the packets on the original machine in some way, using the owner and mark modules of iptables and sending this to the router who does the QoS? From what I understand, mark on iptables only applies to the local machine, so this will not work, but is there another way?

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• Rpm removal does not remove delivered dirs and leaves garbage

  - by Jim

  I deliver an application via an RPM. This application delivers various directories and files. E.g. under /opt/internal/com a file structure is being copied. I was expecting that on rpm -e all the file structure delivered under /opt/internal/com will be removed. But it does not. There are directories in the file structure that are non-empty. Is this the reason? But these (non-empty) directories were created by the RPM installation. So I would expect that they would be "owned" by RPM and removed automatically. Is this wrong? Am I supposed to remove them manually?

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• After my laptop wakes up from sleeping/hibernating, the LCD/brightness is very low. How can I set it to default?

  - by meder

  In Power Management Preferences, On AC Power tab, I have brightness to 100%. "Dim display when idle" is not checked. I know for sure my LCD brightness is capable of going higher, because if I hit Fn and F7 then it resets the monitor brightness and settings for a few seconds, but the resolution breaks and then the brightness goes back. PS: OS is Debian Lenny ( I set the tags but for clarification ) and laptop is a Thinkpad.

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• How to configure three IP address into single server

  - by user1363308

  I have Cisco device for call forwarding and three different system,I want to configure 15 and 16 server IP into 192.168.53.197 means eth0 --> 192.168.53.197 eth1 --> 192.168.16.15 eth2 --> 192.168.16.16 which work i have done with 15 and 16 individual , I will do some work on 197 after configuration eth1 and eth2. Means one system have three IP address but base IP address is 192.168.53.197

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• I wanna save some terminal commands in a file

  - by Jakob Abfalter

  I am using Opensuse 12.3 What I wanna do is, create a link on my desktop for some specific terminal commandos. The backround is, that I do some backup via rsync and don`t wanna type the commandos everytime new. I also dont wanna use a cronjob, since my computer isnt running everytime. Perfect would be some desktop icons, which on clicking execute the command(s). Could somebody tell me how to do this?

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• File descriptor linked to socket or pipe in proc

  - by primero

  i have a question regarding the file descriptors and their linkage in the proc file system. I've observed that if i list the file descriptors of a certain process from proc ls -la /proc/1234/fd i get the following output: lr-x------ 1 root root 64 Sep 13 07:12 0 -> /dev/null l-wx------ 1 root root 64 Sep 13 07:12 1 -> /dev/null l-wx------ 1 root root 64 Sep 13 07:12 2 -> /dev/null lr-x------ 1 root root 64 Sep 13 07:12 3 -> pipe:[2744159739] l-wx------ 1 root root 64 Sep 13 07:12 4 -> pipe:[2744159739] lrwx------ 1 root root 64 Sep 13 07:12 5 -> socket:[2744160313] lrwx------ 1 root root 64 Sep 13 07:12 6 -> /var/lib/log/some.log I get the meaning of a file descriptor and i understand from my example the file descriptors 0 1 2 and 6, they are tied to physical resources on my computer, and also i guess 5 is connected to some resource on the network(because of the socket), but what i don't understand is the meaning of the numbers in the brackets. Do the point to some property of the resource? Also why are some of the links broken? And lastly as long as I asked a question already :) what is pipe?

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• iptables rule for forwarding outbound traffic

  - by Claudiu

  I am trying to forward the outbound traffic to another server. Current rule is: /sbin/iptables -A OUTPUT -p tcp -s localhost -o 91.xxx.xxx.xxx --dport 65000:65010 -j ACCEPT but when I do a iptables -L, the rule its showed like this: ACCEPT tcp -- localhost.localdomain anywhere tcp dpts:65000:65010 So I guess my rule is bad written since the "destination" column shows "anywhere" Can you help me with this?

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• What should I encrypt in Debian during install?

  - by ianfuture

  I have seen various guides and recommendations on web about how best to do this but nothing that clearly explains the best way and why. So I understand there is a need for part of Debian during install to be un-encrypted on its own partition to allow it to boot. Most info I have seen is call this /boot and set the boot flag. Next I believe the best approach is to create another partition out of all the rest of the disk space, encrypt this, then on top of that create a LVM and then within the LVM create my various partitions , name them , select size, and file system type. Can I include /swap in the encrypted LVM part ? Is this approach sound? If so what are the partitions I should use (this is going to be a minimal server install with a view to install as and when what I need for a dev server)? Finally how does the installer know what to put in each partition I define ? I appreciate there are more than one question but any help and suggestions would be appreciated. If further clarification is needed please mention in the comments . EDIT : 16/3/2010 After Richard Holloways reply I thought it relevant to add this info: The reasons why I want to do this are to explore maximising security on any server install and set up, due to interest in the area of Computer Security and Forensics. Also I am trying to peform the task as if it being performed in an enterprise situation. On a technical matter, once set up and configured with minimal packages and ssh this server will not physically be easy to access so I will only be entering via ssh. (Yes I know why encrypt something no one will ever be able to get their hands on? Because I can and I want to is the simple answer, but see above too).

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• GNU Emacs is crashing with -nw

  - by Jack

  When I run emacs with -nw option, the emacs really open, but I can't do more nothing. As if the user input is blocked and no keyboard signal is received and/or interpreted. I've tried run without load .emacs file and some other behaviors: emacs -nw -Q --no-desktop --debug-ini foo.c But makes no difference and strangely the GUI-version(using Gtk) is working fine. My gnu-emacs version is GNU Emacs 23.3.1 Any help to help to fix it is very appreciated.

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• In a php script making /coderoot refer to /var/webroot/coderoot?

  - by Josh

  We are migrating a server and have modified the architecture slightly so that instead of /var/coderoot we now have /var/webroot/coderoot - I realize I could do a scripted find and replace, but I would rather have full unmodified reverse compatibility, or if that's unreasonable lets just say for theories sake. I tried using a symmlink ln -s /var/coderoot /var/webroot/coderoot but attempting to include a file in the code root using /var/coderoot/file does not work. I also tried using mod_alias with ScriptAlias and Alias. Neither worked. Is there anyway to do this?

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• Ubuntu reset network configuration

  - by user1103294

  When I boot up my ubuntu server, it cannot connect to my wireless network anymore. It says "waiting for network configuration" for 60 seconds, boots up, but no wireless. I suspect it's because of the following reasons. I used to connect to a wireless connection named 2WIRE555, password: 123abc But then I upgraded my connection and my new wireless connection was named 2WIRE444, password:111111 Being lazy, I simply renamed 2WIRE555 to 2WIRE444 and changed the password accordingly. I was hoping this would work but ever since then my network configurations is messed up. So back to the issue, how do I reset my network configurations for my Ubuntu 11.10 server?

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• Creating own Amazon Machine Image - Kernel panic

  - by amra

  I have created own AMI and registered it on Amazon EC2. But while AMI startup I receive following error: Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(8,1) The image is running locally without any problems. fstab contains: proc /proc proc defaults 0 0 /dev/sda1 / ext3 relatime,errors=remount-ro 0 1 thx for help

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• How does Heartbeat determine when to switch to the secondary? Can you force it to switch?

  - by John

  I've been trying to understand exactly how Heartbeat works - I understand how when one server dies, it switches to the backup. But, for me, it also switches when the primary has a large increase in workload. But, it doesn't always switch at the same value. There doesn't seem to much information on the web about how it works. The best I've found is this article. How does Heartbeat determine when to switch to the secondary, and how does it determine when it switch back to the primary? Is this an editable setting, and can I force it to switch between one and the other? Sometimes when Heartbeat will switch to the secondary, it takes a few days or I've even seen two weeks before it switches back to the primary. This is well after the primary traffic has gone down. I'm currently using BlueOnyx, and my Heartbeat settings are: Auto Failback: on Keepalive: 1 seconds Warntime: 10 seconds Deadtime: 20 seconds Initdead: 30 seconds

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• How do I set default group ownership for files in a directory?

  - by tnichols

  I am running a cakephp webapp on Linode LAMP. I am finding that my temp files are created with root:root ownership. But the webapp is running with Apache's permissions (www-data). This causes warnings any time there is a new file created because it is not writable for user www-data. How do I change the default ownership to www-data on any new files created in the temp folder? Thanks for your help!

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• How do I get rid of sockets in FIN_WAIT1 state?

  - by Gert M

  I have a port that is blocked by a process I needed to kill. (a little telnet daemon that crashed) The process was killed successfully but the port is still in a 'FIN_WAIT1' state. It doesn't come out of it, the timeout for that seems to be set to 'a decade'. The only way I've found to free the port is to reboot the entire machine, which is ofcourse something I do not want to do. $ netstat -tulnap | grep FIN_WAIT1 tcp 0 13937 10.0.0.153:4000 10.0.2.46:2572 FIN_WAIT1 - Does anyone know how I can get this port unblocked without rebooting?

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• Limited bandwidth and transfer rates per user.

  - by Cx03

  I searched for a while but couldn't find anything concrete, hopefully someone can help me. I'm going to be running a Debian server on a gigabit port, and want to give each user his/her fair share of internet access. The first objective is easy - transfer rates (speed) per user. From what I've looked at, IPTables/Shorewall could do the job easy. Is this easy to setup, or could one of you point me at a config? I was hoping to limit users at 300mbit or 650mbit each. The second objective gets complicated. Due to the usage of the boxes, most of the traffic will be internal network traffic that does NOT get counted to the quota. However, I still need to limit the external traffic, and if they go over, cut off access (or throttle traffic to a very low speed (10mbit?)). Let's say the user has a 3TB external traffic limit. The IF part is: If the hostname they are exchanging the traffic with DOES NOT MATCH .ovh. or .kimsufi. (company owns multiple TLDs), count to the quota. Once said quota exceeds 3TB, choke them. Where could I find a system to count that for me? It would also need to reset or be able to be manually reset on a monthly basis. Thanks ahead of time!

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• grep + sed for find & replace fun!

  - by Jim Greenleaf

  I have a dev copy of a website set up that has quite a few hardcoded references to its live counterpart. I would like to replace all occurrences of "www." with "dev." in all files. I think I can use a combination of grep + sed, but I'm not sure how.

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• running a web server with encrypted file system (all or part of it)

  - by Carlos

  Hi, I need a webserver (lamp) running inside a virtual machine (#1) running as a service (#2) in headless mode (#3) with part or the whole filesystem encrypted (#4). The virtual machine will be started with no user intervention and provide access to a web application for users in the host machine. Points #1,#2 and #3 are checked and proved to be working fine with Sun VirtualBox, so my question is for #4: Can I encrypt the all filesystem and still access the webserver (using a browser) or will grub ask me for a password? If encrypting the all filesystem is not an option, can I encrypt only /home and /var/www ? will apache/php be able to use files in /home or /var/www without asking for a password or mounting these partitions manually? Thanks

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