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• CentOS 6 init script doesn't work properly

  - by user711643

  I'm setting up my ruby production server based on CentOS 6. I need a process called god (which is a process monitoring tool) to start at boot. I'm using an init script that I found here. Just as stated in the guide I ran: chkconfig --add god and then chkconfig --level 345 god on After this if I run "service god start|restart" everything works. It loads the available configurations and brings up the related processes (if they are not running). Problem is it doesn't work at boot. If I reboot the system, then I do "ps -aux | grep god". At this point "god" is running but apparently it didn't load the configuration files. If i run again service god restart, it loads everything without problems. What am I doing wrong?

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• Remove some junk characters from server console log.

  - by Jayakrishnan T

  Please look in to the picture,here am trying to open(with vi editor) my server console log file(around 100MB) and it takes more than two minutes to open with so many special characters.after deleting the first line (means typing "dd")then i can easily view the file and size of the file is also reduced very much.My server OS is RHEL 5.4 and jboss is running in to it. Please help me to avoid such junk characters coming to my server console log files and it helps me to save my valuable space in server.

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• VPS stops responding every now and again

  - by Or W

  I have a Linode vps that I use to host some of my websites on. It's Ubuntu based and it's up to date in terms of all packages. I don't have any cron jobs scheduled or any automatic processes. I host a few (up to date) wordpress blogs there that have very little traffic altogether. Every day (at a different time) my server stops responding, I can't SSH to it, web access is getting timed out and it just dies until I reboot it through the Linode manager. On the linode dashboard I can see that the CPU is not very high (2-3%) Incoming/Outgoing traffic is on 0 and the IO count has a spike just before the server stops responding (SWAP IO is at 2k and IO Rate is at 5k). When I reboot the server everything is just fine. I'm trying to figure out a way to analyze what's going on at these random times where the server freezes up. How can I determine the problem?

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• Using remote station as original

  - by Neka

  I have 2 computers with totally same Debian, config, apps and other stuff. One at work and another at home. It's inconvenient to maintain the same configuration on these stations - upgrading OS, sync configuration, etc. Is there the way to use my home station as "host", and such a "terminal" at work? As if i have one HDD on 2 computers, but must use they own resources like an videocard and another. Looks like i need some remote tool as VNC, but this is no sessional event, I need to use "terminal" comp like original all of the time.

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

  - 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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• USB webcam just works once and next time I've to reboot

  - by user30262

  I'm using Ubuntu 9.10, and a usb webcam that is shown as 'Bus 001 Device 005: ID 0ac8:3450 Z-Star Microelectronics Corp.' by lsusb. The problem is that on connecting the cam, it just works with the first program I start (skype, tokbox, messenger), and if I disconnect it or switch to another program, it stops to work and I have to restart my computer to make it work again. Has anyone else noticed this behaviour? Is there some good solution to reset the camera without rebooting to make it work again?

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• Backing up 80G hard drive 1G per day

  - by barrycarter

  I want to securely backup my 80G HD, but doing a complete backup takes forever and slows down my machine, so I want to backup just 1G per day. Details: % First hurdle: on the first day, I want to backup the "first" 1G of the hard drive. Of course, there really is no "first" 1G on a hard drive. % After 80 days, I'll have my whole HD backed up... assuming none of my files ever change, which of course they do. So the backup plan/program must also catch file creation/changes as they come along. % The backups must be consistent, in that I can restore my system by restoring the backups sequentially. In other words, "dd if=/harddrive" probably won't work. % The backups should encrypt file contents AND names, but I don't see this as a major hurdle. % Once the backup has backed up everything (even changed files), it can re-backup the first 1G on my hard drive. Even though this backup is redundant, that's OK, because I always want to be backing up something (eg, if I'm backing up to optical media, the older media might start going corrupt). Is there a magic backup plan/program that does this? In reality, I want to do this for multiple machines with multiple drives each, but think that solving the above will solve the general case.

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• CentOS server. What does it mean when the total used RAM does not equal the sum of RES?

  - by Michael Green

  I'm having a problem with a virtual hosted server running CentOS. In the past month a process (java based) that had been running fine started having problems getting memory when the JVM was started. One strange thing I've noticed is that when I start the process, the PID says it is using 470mb of RAM while the 'used' memory immediately drops by over a 1GB. If I run 'top', the total RES used across all processes falls short of the 'used' listed at the top by almost 700mb. The support person says this means I have a memory leak with my process. I don't know what to believe because I would expect a memory leak to simply waste the memory the process is allocated not to consume additional memory that doesn't show up using 'top'. I'm a developer and not a server guy so I'm appealing to the experts. To me, if the total RES memory doesn't add up to the total 'used' it indicates that something is wrong with my virtual server set-up. Would you also suspect a memory leaking java process in this case? If I use free before: total used free shared buffers cached Mem: 2097152 149264 1947888 0 0 0 -/+ buffers/cache: 149264 1947888 Swap: 0 0 0 free after: total used free shared buffers cached Mem: 2097152 1094116 1003036 0 0 0 -/+ buffers/cache: 1094116 1003036 Swap: 0 0 0 So it looks as though the process is using (or causing to be used) nearly 1GB of RAM. Since the process (based on top is only using 452mb, does that mean that the kernal is all of a sudden using an additional 500mb?

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• dhclient.conf: Send 2x host-names to the DHCP server?

  - by RobM

  Already working: Debian box DHCP with send host-name me.company.com in dhclient.conf DNS updates automatically with an entry for me.company.com What I want to add: Send a second host-name, so both are automatically registered with DNS In other words: I want a DHCP client to register with DNS twice using different names, preferably without having to maintain DNS records manually. Is this even possible with DHCP?

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• DHCP server 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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• Apache httpd permissions

  - by DD.

  I have created a directory /xyz/www With the following permissions: -rw-r--r--. 1 myuser developers I edited my http.conf: DocumentRoot "/xyz/www/" <Directory "/xyz/www/"> Options Indexes FollowSymLinks AllowOverride None Order allow,deny Allow from all </Directory> I get 403 error: You don't have permission to access / on this server. Looking in the logs: (13)Permission denied: Can't open directory for index: /xyz/www/ I've tried recursively adding 777 permissions but still have the same issue.

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• which user is the website host

  - by Kossel

  I m learning about server, and I'm configuring nginx mysql php wordpress. the server distro is debian 6. I created a new user and I wish each user is the owner of the site folder /var/www/site.one so I chown -R kossel:kossel site.one my problem is, my wordpress only work if I chmod 644 wp-config.php, which all can read wordpress site suggest that file should be 640. and my question is: when someone open mydomain.com, wordpress has to access wp-config.php file, but which user is it actually using to "read" that file? root? user kossel? anyone else? how can I properly give it permission or owner??

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• Open application in background without losing current window focus. Fedora 17, Gnome 3

  - by Ishan

  I'm running a script in the background which loads an image with feh depending on which application is currently in focus. However, whenever the script opens the image, window focus is lost to feh. I was able to circumvent this by using xdotool to switch back to the application that was originally in focus, but this introduces a short annoying period of time where the focus is switched from feh to the application. My question is this: is there any way to launch feh in the background such that window focus is NOT lost? System: Fedora 17, Gnome 3, Bash Thanks a ton!

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• Getting PAM/user info into php - something like Net_Finger instead of a db?

  - by digitaltoast

  I've got a very small user group who just need to login, upload, check and then move specific files to a different area when ready. Right now, I use the nginx PAM auth module to log them in against their unix accounts. As their login is their home directory, I've already got the info to send the uploads to the right area - one line of php and no database needed. But I'm maintaining a separate DB just so PHP can welcome them, grab their email and send them an email when processed. Yes, sure I could use nosql or sqlite instead so as to not need a whole mysql install. But it occurred to me that as I've got all these blank user fields for phone numbers I could populate with any data, that I could use something like php's Net_Finger. Which failed for me with: sudo pear install Net_Finger Starting to download Net_Finger-1.0.1.tgz (1,618 bytes) ....done: 1,618 bytes could not extract the package.xml file from "/build/buildd/php5-5.5.9+dfsg/pear-build-download/Net_Finger-1.0.1.tgz" Download of "pear/Net_Finger" succeeded, but it is not a valid package archive Error: cannot download "pear/Net_Finger" At which point I thought I'd stop, and take a ServerFault reality check - is this a really bad/dangerous/stupid idea just to stop me having to maintain details in two places rather than one? It there a better way? Googling shows that it's not an oft-asked thing, so perhaps with good reason?

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• How to fix Ubuntu 10.10 black screen from terminal?

  - by none

  I'm trying to install Ubuntu Desktop 10.10 on an Intel Atom mainboard (Intel D945GCLF2) with CRT that has been running Ubuntu 9.x previously. Both, Desktop live CD / installer and alternate install CD cause the screen to go black (and the status LED blinks). I was able to get a bit further into the boot process with nomodeset as parameter with the Live CD, unfortunately I can't pass GRUB any parameters now that I have used the alternate Install CD by pressing 'e', it just boots. So now I have Ubuntu installed, I get a terminal with CTRL-ALT-F1 but I don't know what I need to do now or how to adjust resolution or video settings from command line.

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• How expensive is a hostname in htaccess? Other solutions possible?

  - by Nanne

  For easy allow or disallowing of dynamic IP-adresses you can add them as a hostname in a .htaccess file. As I have read from: .htaccess allow from hostname? it does a reverse lookup on the connecting ip address, seeing if the response matches the allowed name. (Well, actually Apache is doing a double lookup, first a reverse lookup and then a forward lookup on the result of the reverse.) This is the reason we are currently not using dynamic-ip hostnames in the .htaccess: this "sounds" quite heavy: 2 extra lookups for every request. Is this indeed quite heavy, and would a reasonably busy server that is rather looking for less then more load get away with this :)? (e.g.: how does this 'load' compare to the rest? If a request is 1000 times more expensive then the lookups it might be negligible. otoh, it could be that final straw :) ) Are there other solutions? I can write a script that does a lookup of the hostname and put it in .htaccess files ofcourse, but this feels a bit like a hack.

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• Almost All Logical Volumes Disappeared - Recovery?

  - by Alex

  We had a hard disc crash of one of two hard discs in a software raid with a LVM on top. The server is running Citrix xenserver. On the hard disk which is still intact, the volume group gets detected well, but only one LV is left. (some hashes replaced by "x") # lvdisplay --- Logical volume --- LV Name /dev/VG_XenStorage-x-x-x-x-408b91acdcae/MGT VG Name VG_XenStorage-x-x-x-x-408b91acdcae LV UUID x-x-x-x-x-x-vQmZ6C LV Write Access read/write LV Status available # open 0 LV Size 4.00 MiB Current LE 1 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0 root@rescue ~ # vgdisplay --- Volume group --- VG Name VG_XenStorage-x-x-x-x-408b91acdcae System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 4 VG Access read/write VG Status resizable MAX LV 0 Cur LV 1 Open LV 0 Max PV 0 Cur PV 1 Act PV 1 VG Size 698.62 GiB PE Size 4.00 MiB Total PE 178848 Alloc PE / Size 1 / 4.00 MiB Free PE / Size 178847 / 698.62 GiB VG UUID x-x-x-x-x-x-53w0kL I could understand if a full physical volume is lost - but why only the logical volumes? Is there any explanation for this? Is there any way to recover the logical volumes? EDIT We are here in a rescue system. The problem is that the whole server does not boot (GRUB error 22) What we are trying to do is to access the root filesystem. But everything was in the LVM. We have only this: (parted) print Model: ATA SAMSUNG HD753LJ (scsi) Disk /dev/sdb: 750GB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 32.3kB 750GB 750GB primary boot, lvm And this 750GB LVM volume is exactly what we see on top.

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• getting error : make: *** /lib/modules/2.6.31-20-generic/build: No such file or directory on Ubuntu

  - by user36637

  getting error : "make: * /lib/modules/2.6.31-20-generic/build: No such file or directory " on Ubuntu 9.1 , When trying to install My wifi card driver and run make command

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• query keepalived

  - by tdimmig

  *Note: I have trouble deciding what should go in serverfault and what should go in superuser, if some kindly admin decides this is in the wrong place please move it for me - many thanks. I am implementing a basic HA system with keepalived. I only want to be notified of the failover in the case of hardware failure. I do, however, have the servers switch roles periodically. I have a track_script running on the backup that will vary it's return between 0 and 1 on an interval (once a week, once a month, whatever). Upon returning 0, the priority is raised above that of the master, upon returning 1 the priority is lowered again. This way they trade places on the configured interval. The question: What can I do to tell the difference between a switch caused by my script, and a switch caused because one of the servers died? I certainly want to be notified when there is an actual problem, but not every time the servers change places because of the script. I see that version 1.2.7 has snmp support and I may be able to use it to get some information that could tell me one way or another, but to be honest I've never used snmp before and I don't know how to get the information I want with it (my Google foo failed me).

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• How to turn off ASLR in Ubuntu 9.10

  - by Summer_More_More_Tea

  Hi everyone: I want to turn off ASLR on my own PC. But each time I type "sudo echo 0 /proc/sys/kernel/randomize_va_space", the system shows that "Permission denied". How can I make it work? By the way, my OS kernel is 2.6.30. Hope anyone can give me a hand. Regards.

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• How do I install Apache Portable Runtime?

  - by apache

  My Apache is installed by yum install apache And now I'm trying to install subversion server from source following instructions here. But when I try to configure,get an error: [root@vps303 subversion-1.6.9]# ./configure configure: Configuring Subversion 1.6.9 configure: creating config.nice checking for gcc... gcc checking for C compiler default output file name... a.out checking whether the C compiler works... yes ... checking for APR... no configure: WARNING: APR not found The Apache Portable Runtime (APR) library cannot be found. Please install APR on this system and supply the appropriate --with-apr option to 'configure' or get it with SVN and put it in a subdirectory of this source: svn co \ http://svn.apache.org/repos/asf/apr/apr/branches/1.2.x \ apr Run that right here in the top level of the Subversion tree. Afterwards, run apr/buildconf in that subdirectory and then run configure again here. Whichever of the above you do, you probably need to do something similar for apr-util, either providing both --with-apr and --with-apr-util to 'configure', or getting both from SVN with: svn co \ http://svn.apache.org/repos/asf/apr/apr-util/branches/1.2.x \ apr-util configure: error: no suitable apr found How do I get around this problem? BTW,will both client and server software be installed by compiling from source?

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• Reading a file from an alternate location

  - by Highstaker

  I have a certain file (data.abc) located in, say, my home folder. I make a copy of it to another location (for example, "/mnt/ramtemp/"). Whenever the file in my home folder is accessed by any process, I want it to be read not from home folder, but from "/mnt/ramtemp/". As you might have guessed from the path of the latter, it is where I mount the ramfs. So, basically, I want a process to access not the file on my HDD (which is slower), but its copy on ramfs (which is way faster). At the same time, I want the file data.abc to remain in my home folder under that name, I don't want to rename or delete it. Is there any way I could guide the system to redirect the processes to read the file from alternative location whenever they try to read it from home folder?

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• Directory permissions on Ubuntu Server 10.04 LTS

  - by SebastianOpperman

  I have set up a second drive on Ubuntu Server. The directory displays correctly but Windows users cannot write or create files on the directory. I have Samba set up so Windows can access the drives. here is the last bit of my /etc/samba/smb.conf [personeel] path = /media/windows browsable = yes guest ok = yes writable = yes read only = no create mask = 0775 directory mask = 0775 I want the directory to be shared with writable permissions to everyone who can access the Ubuntu Server. I have tried sudo chmod but to no success. Any help would be appreciated

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• How to rename all subfolders with a specific Name

  - by shane

  How to go through all the subfolders and rename all the folders named 'Old' to 'New'

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• Error installing Java on Ubuntu Server

  - by Camran

  I get this error almost when installation is finished: /proc is not mounted; some java apps may fail Could not create the Java virtual machine. Error occurred during initialization of VM Could not reserve enough space for object heap Ignoring error generating classes.jsa Why is this? I just entered sudo apt-get install sun-java6-jre sun-java6-plugin sun-java6-fonts Is there something I must do first? What is Proc? If you need more input let me know. Thanks

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