Server :: Creating A System Less Reliant On NFS Served Partitions
Feb 8, 2011
My chief file server (Dell PE R300) died last week with a disk error, and because it serves the /usr/local and /home partitions via NFS to my ~60 desktops, nobody could do any work until I managed to rig up another server and pull data off the backups. I'm using RHEL 4.To avoid this in future my plan is to knock up a dual server solution with DRDB and Heartbeat.In the meantime, is there a better way to allow desktop users to carry on working as normal, without relying on the file server too much? i.e. something better than NFS but not LDAP (I don't want to implement this just yet as the organisation as a whole may do this in the future)? My users need to be able to access the same home area on any linux desktop managed by me.Also, to implement DRDB/Heartbeat, it might be best to have the home areas on an external array, is that right? Can anybody recommend some hardware?
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Dec 21, 2010
I am rebuilding a bunch of servers and want to do it right. They are Dell R200s and R300s with on-board LSI SAS1068E SCSI controllers with 2 SATA drives. The only RAID level supported on these cards is RAID 1. So, to the server, we have 148GB of space to deal with. They currently run 32-bit Ubuntu 8.10; I will be installing x64 Ubuntu 10.04.
I have always seen that it is best practice to partition in such a way that /boot, /var/log, /temp, and /home for example are separated out from /. Usually this is on a RAID5 or higher box. Is there any benefit to doing that sort of thing on a RAID1 box? I realize that this is in some ways a matter of opinion, but I would like the opinion of folks with experience. I'm pretty new to Linux in general.
The main services running on these boxes are Apache2, Tomcat6, MySQL, and Java.
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Jul 23, 2010
I use NFS to serve up my media files to all the other machines on my network. What I am seeing is if a client has the NFS directories mounted for a couple of hours, files will start "vanishing" from what is being served up. The files are still there on the server. The client can no longer see them. The only way to make them viewable to the client again is to unmount the directory on the client and then remount it.
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Oct 19, 2009
Is there some way that I can use apache/iptables to serve both of my servers through the same basic domain? I'm not talking about VirtualHosts either, I don't believe ( despite the fact that's all I can find anything to read about on Google when searching for this ).
Anyway, the problem is that I have a TorrentFlux php torrent-client that I run so I can add stuff to the download when I'm not around. I don't want to put this on my regular webpage server because there's just not enough diskspace in that machine. On the other hand, I don't want to replace that server all-together because the other machine is my desktop and would not make a reliable host.
So my idea was that there could be some way to have the apache2 server on my dedicated server redirect a subdirectory in its webroot to the webroot of my desktop's TorrentFlux server, but over standard HTTP ports so that it is more like the server is serving up the content of my desktop server through its HTTP service, instead of simply redirecting.
The reason I want to do this is because so far I have to use the TorrentFlux server on a nonstandard port so my dedicated server can still host its own things on port 80, but I've been running into several situations where the browsers I want to use do not support the nonstandard port such as with some instances of IE or the browser on my BlackBerry.
Anyway, I'm not looking for a step by step or anything ( though it couldn't hurt ) but I just need some ideas on what I could search for to get some better ideas. There's probably some term for what I want to do I'm not even aware of that would help me greatly.
Runnining Ubuntu 7.04 and apache 2.2.4 along with shorewall 4.0 as my routing/firewall software.
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Feb 19, 2009
We are having an odd apache issue. Certain files are not being served out.The files actually live in a remote DFS volume served off a windows system. They're mounted under /data/vizwx. There's a subfolder here called wx_intranet which has all the data.The Document root for this virtual host is /data/www/htdocs. There is a data/vizwxsubdirectory with a symlink named wx_intranet which points to /data/vizwx/wx_intranet .SELinux is completely disabled (not even permissive).
When a user requests a file from http://<host>/data/vizwx/wx_intranet/VizWx_14c.jpg no error is given to the browser. Firefox just shows the URL in question (I can't even view source). The <vhost>_access.log file shows: wx_access.log:172.16.1.16 - - [19/Feb/2009:15:30:16 +0000] "GET /data/vizwx/wx_intranet/VizWx_14c.jpg HTTP/1.1" 206 167791And there's nothing in the <vhost>_error.log, even after cranking the LogLevel up to info.
The permissions on the files in the share are slightly weird for reasons I don't fully understand, but they should work... the files are an effective 'chmod 3777 <file>' for all files in the mounted directory... that's with Sticky and SetGID bit set.What am I missing here? Oh, I also modified the Vhost's options from "Options all' to 'Options all -SymLinksIfOwnerMatch" to see if that was the problem... no dice.)CentOS v5.2, apache 2.2.3
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Sep 2, 2010
If I use PHP or SFTP to delete or replace a file while it is being served will this cause the download to fail?If so is there anything I can do about this, the concern is for large files.
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Jun 18, 2009
I want to put Google analytics code on all legacy pages on my server, most of them don't have a template so I was wondering if Apache can automatically append the code.
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Sep 25, 2010
I have a white slate centos 5.5 installation on a virtual box at Media Temple (one of their new VE servers). I am trying to create a development environment where I can have Bind9 serve up one set of zone files to me and other developers on the internal network and another set of zone files to external requests (ie... using the views feature). I would like to be able to develop for sites for which the dns is not yet pointed at my server. The network is created by having the VE server be an OpenVPN server, and connecting my client box to the server (my mac - 10.8.0.6 / my ve server 10.8.0.1).
I have the connections working fine, I have also been able to route all network traffic from my mac through the vpn to the server. For some reason, I cannot get the DNS server on the ve server to serve me an internal view zone file. When my vpn is on, I cannot ping or navigate to any web pages from my mac. I think this is because my ve server is not setup as a dhcp server and the ip tables are not setup to allow all internal requests to use the server to go get web pages.
I cannot view-ping anything else from my mac/client when on the vpn, I can successfully ping any website my ve is authoritative for. This tells me that my ping is obviously going over the vpn, and thus an internal request, but the external zone file is still served up. The following is my named config.
acl "lan_hosts" {
10.8.0.0/24;
127.0.0.1;
};
[code]....
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Sep 30, 2010
I have a dell poweredge 2950 server which had red hat on it. I have installed ubuntu on top of it. I have replaced master boot record during the installation of ubuntu as I dont want use red hat anymore. During the installation it asked me for the space I wanted to give for Ubuntu and I provided 10GB. Now I can use only 10GB of my harddrive until I mount other partitions correct?
So when I type sudo fdisk -l I get the below printed:
Code:
Disk /dev/sda: 146.2 GB, 146163105792 bytes
255 heads, 63 sectors/track, 17769 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
[Code]....
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Jan 6, 2011
I have what I thought was a simple task of creating ISO images of my Windows 7 system partion and boot partiton (the C drive) on my physical hard drive that I could use to load Windows 7 onto a virtual machine. Anyway, I'm running Ubuntu off the CD drive and I can see my drive partions (checked using the fdisk -l command). I have tried many iterations of the mkisofs command, but no matter what I do I get the error message: unable to open disk image file 'dev/sdb/win7sys.iso'. I don't understand why it's trying to open an ISO file it is supposed to be creating. The -o FILE option sets the output file name, so the message makes no sense to me. Below is an example of a simple and longer version with more options that I have tried to create an image of my sytem partiton (sda1) and save it on an external drive (sdb) with the file name: win7sys.iso (the next step I think would be to create or merge both partition images as one iso file for the VM). But I can't get past this error.
Can anybody tell me what I'm doing wrong?
sudo mkisofs -o dev/sdb/win7sys.iso /dev/sda1
sudo sudo mkisofs -input-charset iso8859-1 -V win7sys -o dev/sdb/win7sys.iso /dev/sda1
* Note that the output after the -o parameter is the desired destination /dev/sdb (my external drive) for the image file and /dev/sda1 is my Windows 7 system or boot partition (sda2 is what Windows sees as the C drive).
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May 27, 2010
I'm trying to create some Linux partitions to install Slackware on my Lenovo W510 notebook and I'm getting some partition "errors" when using fdisk or cfdisk during the Slackware install. I have a feeling this is due to the hidden system restore partition and was wondering how others have dealt with this.
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Jan 19, 2010
I have been using GHOST for quite a few years to back up my Windoze partitions from NTFS to a series of images on a fat32 partition. I usually boot off a DOS7 bootable CD and simply ghost over to the fat32 partition.
I am rebuilding my laptops and desktops to dual boot Windows7 and Suse 11.2
My goal is to create restore images from my NTFS and ext3 partitions into directories on the fat32 partition for a restoration to my "gold baseline" build after any corruption.
My partition layout is below. This is output from gdisk.exe in DOS7. It's an 80gig drive.
1 = Windows-7
2 = /boot
3 = swap
5 = /
6 = /fat32
[Code]....
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May 1, 2010
I'm currently running a Ubuntu 9.10 64bit machine with one of those 2TB WD disks that does have 4KB blocks.Unfortunately the current partition layout is misaligned, so I plan to back up my home directory and start fresh with a 10.04 install, trying to make the partitions aligned as suggested here:what I'm wondering is, does the 10.04 partitioning program take care of the alignment today or I have to resort doing manual partitioning with a separate tool?
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Jun 30, 2010
I am installing Linux on some spare space I left over from my previous two Windows installations.
From within Linux, what's the most risk-free way of imaging these two partitions and saving them to a single image file or archive? I want to preserve the entire partition because I have no idea what I may have forgotten to copy. What is the most suitable program that can do this?
Is there any way to run the partition in a virtual machine at a later date?
After this is done, I want to delete those old partitions and extend my Linux ones.
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May 2, 2010
I bought a new SD card which I intend to put some MP3s on - except that I can't write to it because it tells me the destination is Read Only. No-probs thinks I: I'll just reformat it.
"Error creating file system: helper exited with exit code 1: cannot open /dev/mmcblk0p1: Read-only file system"
Various chmod commands all result in Read-only file system. I tried umount then mount commands, but it couldn't find it to mount once I'd unmounted it using the same /media/ file path (I assume it's the only one).
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Oct 30, 2010
My problem is that every time I try to install a version of Linux, my PC freezes(before or after creating the partitions) and just stops installing. I can't move the mouse cursor and that's it. This problem occured in trying to install Ubuntu and Fedora from cd and usb.
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Nov 1, 2010
What I have is Xubuntu running as a VM with VirtualBox on my Windows 7 Media Center that is always on. I am trying to be able to remotely access an X display on that box to do network auditing/ various linux stuff from the various places I go. I would like it to be as simple as possible and leave no trace on the remote computer, so what I would like is to use a java-enabled browser to connect to an xvfb on xubuntu with SSL encryption. I almost got it working using cherokee/x11vnc/desktop.cgi but it only works once or twice and I get network errors even on localhost. I would rather just not have X running all the time on the VM and just have an xvfb display waiting/created when I log in remotely from a browser.
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Apr 8, 2011
Over the last 3 or 4 days, I have been unable to load sites that serve their images, scripts and whathaveyou from Amazon's cloudfront domain.
[URL]
I have made no changes to any of my networking files, hosts{allow,deny}, or dns settings.
Connections don't provide any errors, just continually fail to load. Stopping the page load after a while reveals the raw HTML in some cases (quora and blekko).
Tested in Firefox, Chromium, Midori and Vimprobable.
I have booted into another distro and pages resolve immediately.
I have disabled IPV6 and my firewall - to no effect.
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Dec 30, 2010
I have a server that host's several sites, recently I had to create a new server because the old one isn't good enough for me. Ive installed apache2 on the new server and moved all the files from one server to the other. I'm making tests in my local lan so I've edited my computer's hosts file to point to the name of each site to the local ip of the new server:
192.168.1.85 www.mypage.com
192.168.1.85 svn.mypage.com
192.168.1.85 trac.mypage.com
I have all the site definition files in /etc/apache2/sites-available I also have the used a2ensite to enable each page.
Whenever o use my browser to try and access each of the sites I always get the svn.mypage.com page and none of the others.
here is some debug info:
Code:
sudo apache2ctl -S
VirtualHost configuration:
wildcard NameVirtualHosts and _default_ servers:
[Code]....
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Feb 8, 2011
How to find IP address of computers in LAN served by simple DHCPd (in ADSL modem - without IP reservations/MAC address).
So is in Ubuntu something like on-fly name resolution in Windows ? Without running DNS server with some kind of DynDNS ?
e.g.
My comp has hostname "GoGo" but I get random IP address from DHCP.
How can other PC on same LAN resolve my changing IP address ?
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Apr 23, 2011
How can I create a system restore point in Ubuntu, and when I do so am I able to restore to a point before installing Ubuntu?
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Jun 20, 2011
I want to make a Dual Boot system completely made out of Linux. The two OS will be Fedora 15 (Gnome) and Ubuntu 11.04 (as i love the simplicity of Gnome). The question that has been striking me for quite sometime is not that if I can have both of them on a single computer but that if both of them can have a single Linux-Swap and home drive with separate root drives. Root drives for Ubuntu 11.04 might be around 10GB while that for Fedora 15 will be 20GB with 5GB of Linux-Swap (a single swap drive for both the OS) and if possible a 20GB space for the home folder common for both the OS.
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Mar 24, 2011
how to create a new system call Linux? what is the process of creating ?my project is to create a system call for displaying owner of a file..where exactly we have to write the system call code? and where are the places need to change ?
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Jun 8, 2010
I need some help creating a triple boot system, I have already installed XP and W7, now I am installing Fedora 12 (this is for work so unfortunately it has to be like that). Now the problem is that I want it to show all the partitions in GRUB. Right now it works by going to GRUB first, when selecting Windows it jumps to the Win7 boot manager.
I tried to have them all in one but it seems like the addresses I used in GRUB did not work cause it keeps directing me to the Win7 BM. BTW I am using a single drive with 3 different logical partitions.
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Oct 31, 2010
I am currently running Windows Vista... and I want to install Ubuntu 10.10. Just wondered if anyone can tell me how to install Ubuntu alongside my Windows OS so that I can still play WoW and other windows games.
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Nov 11, 2010
I had problems with my old Ubuntu version,so I decided to upgrade to Ubuntu 10.10. As I wanted to keep my old files I didn't choose the erase the hard disk and install option so the installation system created automatically another partition.
Now that I've installed it I want to delete my old Ubuntu version AND keep my old files, or at least the most important ones (videogames saved games, openoffice documents, music and video). BUT there's one big problem, I can't start the old partition, if I try to run it it runs OK except that I don't see anything in the screen (yes, I listen to the Ubuntu start sound and so, but can't see anything). It happend before, that's why I changed it.
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Sep 4, 2010
With Windows 7 pre-installed, what is the procedure for creating a dual boot system with Debian (kde)? The computer has an amd64 processor.
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Nov 9, 2009
I had installed CentOs 5.3 on a Virtual Box machine (v. 3.0.10) and then I needed more free space to upgrade to CentOS 5.4 on partition /. I wanted to substract some space from /home partition in order to add some more free space to /. Thus I used a gparted live cd (v. 0.4.8-1) that it is a debian live cd. I resized the partition as I wished and every operations went successfully, but when I tried to reboot the only message that I see its 'GRUB' and nothing else happen. If I start again with the gparted live cd, everything seens to be fine as the partitions are there but I can't boot the system.
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Mar 25, 2010
I am at my own desktop and I have root access on my own desktop.
I also have root access on a Desktop Ubuntu system (192.168.5.10) on the LAN. I need to create another desktop user account on that 192.168.5.10 system.
So I logged into that system with: ssh -Y myself@192.168.5.10
Then I did: sudo users-admin
This brings up the Users Settings but the Add User and Unlock buttons are disabled. How do I enable these buttons?
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Feb 4, 2011
Installed Ubuntu 10.10 and it works very well except I cant format cd or dvds. I am using the disk utility program in administration and keep getting the following error:
Error creating file system: helper exited with exit code 1: Error calling fsync(2) on /dev/sr0: Input/output error
I have tried mounting and unmounting - makes no difference.
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