Server :: Ubuntu Versus Centos In A Large Web Environment

Mar 8, 2010

I have been a RPM-based distribution guy for a long time (redhat,centos,suse). We have a large shared and dedicated web environment that is starting to require more and more linux. I am in a position to switch gears and move to ubuntu if it makes sense. Things that are important to me are:

1. ease of deployment (both servers and websites themselves)
2. patch management
3. documentation

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Ubuntu Servers :: Samba In Large Scale Environment.

Mar 31, 2011

The Linux samba server would be part of the Windows domain.What's the best way to add shares for all of the students, assuming there is 200 students per folder? Is there a way to add a wildcard like $(USER) (that's logged in)//fileserver/ students/classof2011/Bill_Gates? Or would a directory path have to be created for each student?Either way is fine. I'm just curious what the proper protocol is for completing that task.

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Server :: Large FTP Transfers Hanging CentOS?

Feb 3, 2011

I've got a server running CentOS 5.5. I used the automated iptables config tool included in the operating system to allow traffic for vsftpd, Apache and UnrealIRCd. When I send large files to FTP, even from the local network, it works fine for a while and then completely times out... on everything. IRC disconnects, FTP can't find it and when I try to ping it I get "Reply from Destination host unreachable" where ..134 is the host address for the Win7 box I'm pinging from. This is especially frustrating as it's a headless server, and as I can't SSH into it to reboot I'm forced to resort to the reset switch on the front, which I really don't like doing.

Edit: the timeouts are global, across all machines both on the local network and users connecting in from outside.

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CentOS 5 :: 5.2 Installation Hangs On Server With Large Number Of Drives?

Apr 6, 2009

I am attempting to upgrade a system from 4.7 to 5.2 using a (now) DVD drive attached to the onboard IDE. Originally I had tried using a remote NFS image and a USB stick but I thought maybe there was a problem with the image. I can get up to the point of the installation of selecting the keyboard for the system and then it freezes and never goes any further. It doesn't appear to be a kernel panic since I can still switch between consoles.

I've got an MSI K9NGM2-FID with 14 drives in it. It serves as a file server for our backup server. It's got a secondary 4 port Silicon Image SII 3114 SATA card using the sata_sil module, and an old IDE Promise FastTrak TX2000. Technically I could have 16 drives but the 750W PS is walking the fine line on tripping it's self-breaker with the 14 drives and 7 fans. I would like to NOT have to disconnect all of this to do the upgrade.

I thought maybe that running the install using the "noprobe" option would help so it didn't detect and load the modules for the Silicon Image or the Promise cards and detect all of the drives but it still gets stuck on the step after selecting the keyboard. The installation info console and the dmesg console don't really provide any useful information. The installation console says:

INFO : moving (1) to step welcome
INFO : moving (1) to step language
INFO : moving (1) to step keyboard
INFO : moving (1) to step findrootparts

And the last lines of the dmesg console says:

<6>device-mapper: multipath: version 1.0.5 loaded
<6>device-mapper: multipath round-robin: version 1.0.0 loaded
<6>device-mapper: multipath emc: version 0.0.3 loaded

Is there a hidden "debug" option that will turn on a lot of extra logging?

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CentOS 5 Server :: Set MySQL Environment Variable?

Sep 17, 2010

I have successfully installed XAMPP on CentOS. I can access PHPMyadmin from my browser. So my mySQL installation is OK. I need to set Environment Variable. I am confused about the path directory.

For an example in windows the path was:

%MYSQL_HOME% -------> C:xamppmysql

What will be the path for CentOS $MYSQL_HOME? Under LAMPP folder I did not see the "mysql" folder

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CentOS 5 :: Fresh Installed Server With Large Partition In RAID1 Config High Serverload

Mar 15, 2009

Yesterday I installed a new server with a large partition for my XEN images. This partition is a about 930GB. The installation tooks ages and after he finished I was finding out why that is. The SoftRAID1 I configured is rebuilding the large partition.

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General :: Installing A Desktop Environment On A Centos 5.5 Server To Run VNC ?

Apr 27, 2011

I've done the following:

But when I connect via, VNC I get a minimalist screen and console.

I ran "startx" and got this:

I need to get a real desktop environment running on this box.

Centos 5.5.

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CentOS 5 Server :: Cannot Setup Diskless Environment With Host (3.9 Kernel)

Feb 11, 2010

My problem is that I can't setup a diskless environment with CentOS 5.4 (server) and CentOS 3.9 (hosts). On the host, I've recompiled the CentOS 3.9 kernel, with these mods:
- added kernel level IP autoconfiguration;
- added NFS file system support;
- added Root file system on NFS;
- added e1000 driver (the host has a gigabit network card);

Then, I have followed the guide at this link: [URL]
But in my dhcpd.conf I'he put other parameters:
ddns-update-style interim;
allow bootp;
allow booting;

subnet netmask {
option routers192.168.195.254;
option subnet-mask255.255.255.0;
option domain-name"";
option domain-name-servers192.168.195.254;
option time-offset-18000; # Eastern Standard Time

host dante79 {
option host-name"dante79";
hardware ethernet00:20:38:01:C3:7C;

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CentOS 5 Networking :: Ping -I On 5.2 Versus 4.7

Feb 12, 2009

I have two CentOS servers on the same LAN. One is CentOS 4.7 the other 5.2 They both also have a WAN interface to the same remote network. On CentOS 4.7 I can ping the remote network through the CentOS 5.2 server. i.e. ping -I eth0 remotehost On CentOS 5.2 I can NOT force the ping to go out the CentOS 4.7 server without over riding my routing tables to make eth0 a more direct route than the eth1 route.

On 5.2 If I do the ping -I eth0 remotehost, and a tcpdump on eth0, the outbound ping will not be going out eth0, he overrides it and sends it out eth1. In fact, on CentOS 4.7 if I do not have a route to the remote network through the other server (turn proxy arp off on the 5.2 machine), I will get "Destination Host Unreachable". I would ideally like to get the 5.2 machine to behave the way the 4.7 machine does.

My real life application for this is that I have a CentOS server in a location that controls access to the Internet. There is another router on the netowrk that handles traffic back to our corporate office. the CentOS server also has the ability to get to the corporate office. I ping the corporate office through eth0 to find out if the link through the other router is indeed up and active. I want to make this a CentOS 5.2 server but alas, I can not tell if the other route is up or not.

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CentOS 5 :: RedHat EL Versus 5.5 Packages

Feb 17, 2011

I'm running CentOS V5.5. I am intererested in several packages available under RHEL V5. Is it possible to install these directly into CentOS or should I be looking for a package built for CentOS 5 specifically?

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CentOS 5 :: YUM - Install Versus Upgrade

Feb 18, 2011

How does yum determine to "upgrade" an rpm verses "install" (and possibly delete) a package when performing a yum update? I have read documentation that yum uses the "Obsolete" and "Conflicts" tags within the rpm to determine whether to upgrade or install a new rpm. Is this correct and complete? I recall from somewhere kernel rpms should always be installed and never upgraded. How does yum determine that kernel rpms need to be installed using rpm -i as opposed to rpm -U? I have scanned a kernel spec file looking for clues without any luck.

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CentOS 5 :: Cannot Install CentOS On Large Disk (> 8 TB)?

Apr 20, 2010

I have a server with 10 disks 1TB with RAID 5, and I want to install CentOS 5.4 on this disk, but fail

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CentOS 5 :: 12GB Of RAM On 32bit XEN Kernel - MemInfo Versus XMTop

Feb 10, 2010

I have a server with 12 Gig or ram in it (has per bios detection). Free and meminfo agree.
[root@virtualHost ~]# free
total used free shared buffers cached
Mem: 7726080 794136 6931944 0 50036 391236
-/+ buffers/cache: 352864 7373216
Swap: 8385888 0 8385888

xm top does not :
xentop - 13:36:07 Xen 3.1.2-164.11.1.el5
5 domains: 2 running, 3 blocked, 0 paused, 0 crashed, 0 dying, 0 shutdown
Mem: 12577024k total, 12575312k used, 1712k free CPUs: 4 @ 2833MHz

In my /proc/cpuinfo I can see pae in the flags. None of my domUs are going to need more than 3 GB of ram but I was wondering what is the REAL ammount of RAM accessible to the system. If I run 4 domU at the same time. Around 7 GB or 12 GB?

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CentOS 5 :: Centos-approved Way To Handle Group Environment Configuration?

Mar 10, 2010

What's the centos-approved way to handle group environment configuration? Let's say there are users in, oh, 4 different groups. Let's use the usual suspects:


and I want to set up environment variables and maybe some pathing that are specific to a given group. So that when 'joeblow', who is a member of group 'warehouse', logs in, the pathing and environment variables (and whatever else) that is needed for users in the 'warehouse' group is set up and configured.

What I was initially looking for was an /etc/groups.d, and in /etc/groups.d is


As part of the login process, the group memberships for the login username would be examined, and for each hit the respective /etc/groups.d/ script would be run. I'm not seeing anything like that, so I'm assuming centos uses some other mechanism, but I'm obviously not using the proper keyword mojo. Can someone point me to where this mechanism is described?

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Server :: Two Servers Versus Virtualization

Jun 2, 2011

I am leading a project at work that will require at least one new server. There will be a development server and a production server, which changes from development will be rolled onto. Unfortunately, I am more of a web programmer than a Linux guru, and I really don't know whether or not it is better to have two physical servers or two virtual servers on one machine. I don't think there will be a huge toll on the machine, as there will probably be around 1000 total users and less than 100 on at any given time. We are also able to spend quite a bit on the server, so I'm sure one could handle it, but I just wanted to check and see what the advantages and disadvantages would be in this situation.

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Ubuntu Networking :: Different DHCP Behavior In Server Versus Desktop

Jan 20, 2010

I've noticed something strange in the behavior of how Ubuntu server obtains it's IP address versus Ubuntu desktop and other versions of linux and Windows. When Ubuntu desktop obtains an IP address from my router that address is retained from one bootup to the next, same behavior as Windows, SuSE, and pretty much any other OS. Ubuntu server on the other hand grabs a different IP address everytime it boots. At first I guessed it was a difference in /etc/dhcp3/dhclient.conf so I replaced it with the dhclient.conf from Ubuntu desktop but no dice, it still grabs a new address every time.

In /etc/network/interfaces Ubuntu server defines the loopback interface and primary network interface, just as it should but Ubuntu desktop does not define the network interface, only the loopback interface. I'm guessing something else controls does this. Desktop appears to be storing previous IP lease information in /var/lib/dhcp3/dhclient.eth0.leases but server doesn't, /var/lib/dhcp3/dhclient.leases is always empty and there's no other files in /var/lib/dhcp3/.

Apparently something isn't writing old lease info there. Without setting a static IP address, how can Ubuntu server be configured to retain the same IP address between boots like Ubuntu desktop?I'm using Ubuntu server 8.04LTS, Ubuntu desktop 9.10 & 9.04, SuSE 11.0, Linux Mint, Windows XP, pfSense 1.2.2 as router.

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Server :: Zimbra Versus Qmail And Sendmail

Jan 17, 2011

I want to setup either Zimbra, qmail or sendmail. i have no idea of these three mtas (i am new to these mail servers)but give me the suggestion that which one is better in case of security, fast routing the messages, scalibility and portability and cost.

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Server :: Remote MySQL Server Connection Dies After Wget Large File

Feb 3, 2011

We have 2 servers, 1 is the webserver and the other is the Mysql server.

When transfering a 2GB file from the webserver to the Mysql server.

The webserver's connection to the mysql DB server dies completely.

Need to restart the MYSQL process in order for it to come back online.

During this connection downtime, when using phpmyadmin on the mysql server shows no problem running queries etc.

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Ubuntu :: Server Versus Desktop (Unable To Boot 9.10 Without Screen Attached )

Mar 14, 2010

I have Ubuntu 9.10 installed on an old Gateway desktop. It is running a system called Jira using a Tomcat web server, so 99% of the time access is thorugh the web browser. For the rest of the time I access it remotely using TightVNC. This works great so far but the system will not boot if I remove the screen (which I need to do since it is in the way). My question is this...

a. If I uninstall and reinstall using Ubuntu Server edition (32-bit) will the system boot without the screen?
b. Assuming the above will work - can I still access the machine directly using TightVNC (I presume not since that needs the graphics setup). If not, how do I connect to the machine remotely?

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CentOS 5 :: Value Too Large For Defined Data Type

Apr 13, 2009

I've downloaded a big file from another server via "wget" to my /backup/ directory, and after the download was compeded I did run "ls" and the error was:ls: full_plesk_backup: Value too large for defined data type.

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CentOS 5 Networking :: Large Iptables Rule Set?

Jan 10, 2011

Loaded up Centos 5.5 final. Configured iptables to block regions of the world based on networks. An example would be:


My /etc/sysconfig/iptables file contains about 10k entries like this. If I use this, the machine lags hardcore network wise.

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Server :: Windows 7 To Linux Server Print Job Size Very Large

Jan 21, 2011

I'm new to setting up Linux Servers. I've setup a Ubuntu 10.10 Server along with CUPS and I'm using Webmin to talk to the server. I have a HP PSC 1315 Multifunction printer connected via usb to the server. Using the CUPS web interface I am able to get the server to detect the connected printer and it identified the HP PSC 1310 Series drivers.

When I printer a test page from the server's screen the print job goes through ok and the size was about 5k.

I then setup a samba share to allow my Windows 7 machine to share the printer. Windows 7 is able to pick up the shared printer correctly and I used the default HP 1310 Series drivers. When I tried to send a test page to the printer, that single page ended up being 3887kb and I also tried printing out a single paged word document which ended up being over 7MB.

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Server :: Design An Inexpensive Large Scale DNS Server But Fail To Find Any Metrics Or Methods To Base Scalabilty?

Nov 28, 2010

I'm trying to design an inexpensive large scale DNS server but fail to find any metrics or methods to base scalabilty.Can anyone offer information on building a stable dedicated DNS server? That might be able to scale well.

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CentOS 5 Networking :: Configuring For Large Number Of Tcp Connections?

Jan 24, 2011

i've got a select based application that wants to support a large number of mostly idle connections. the code is java and works on windows, suse enterprise linux, mac os x. it does not work on centos 5.5 (32-bit, 2.6.18 kernel, 1G of memory).

i've read and followed the directions in various articles about tuning linux for large numbers of connections (including the C10K problem), and gotten the number of sockets up to 3200.

these didn't make any apparent difference:


on windows, i can get up to around 78,000.

on suse enterprise linux (a few years ago), i got up to 90,000. that's where i got bored and stopped.

on my mac laptop with os x (snow leopard), i got up to 10,500.

i have used ulimit -n 10240

my current goal is 10k sockets.

the test is that i'm opening one socket at a time until it fails. when it fails, many of the sockets which have already been opened also fail, in one giant cascade. sounds like a buffer / memory problem.

each group of 64 sockets gets a thread to manage select calls for them. thus i'm only using around 61 threads total when it fails.

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Server :: Configure Email Server In Cloud Server Environment?

Jun 15, 2011

I have installed the Apache, PHP and MYSQL in the rackspace cloud server environment. Can anyone please guide me How can I configure email server in that with postfix or some other with multiple domain.

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CentOS 5 :: Run 5.3 In ESXi 3.5 Environment?

Jul 13, 2009

We are having some problems in running CentOS 5.3 in our ESXi 3.5 environment. The virtual machine is running perfectly under VMWare Player, but when I converted it to ESXi using VMWare vCenter Converter 4.0.0, the CentOS often goes into a panic right at the start of stops when setting up the hostname.

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CentOS 5 :: Setup Dev Environment With Samba?

Mar 11, 2010

I have setup samba and shared /var/www/html on a shared folder so that i can access the folder directly via my IDE, however i cannor write file in there, is there any better way of doing it ?

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Server :: Basic Postfix And Dovecot Mail Server For A Test Environment?

Sep 16, 2009

I did a a basic install of postfix and dovecot instead of using courier-pop and courier-imap. This is only send and receiving e-mail locally within the test network 10.7.0.X and 10.0.0.X. I used:


my postfix.conf is;

PHP Code:


This is the error when I send an email from a local machine on the 10.0.0.X network.

PHP Code:

Jan 20 17:05:48 testbox postfix/smtpd[2491]: warning: Illegal address syntax from unknown[] in MAIL command: <test@> 

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Ubuntu :: Server Crashes When Transferring Large Files

Feb 6, 2011

Every time I attempt to transfer over a large file (4 GB) via any protocol, my server restarts. On the rare occasion that it doesn't restart, it spits out a few error messages saying "local_softirq_pending 08" and then promptly freezes. Small files transfer fine.

Relevant information:

Ubuntu server 10.10
Four hard drives in RAID 5 configuration
CPU/HD temperatures are within normal range

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Ubuntu :: Fonts Are Just Too Large And Large

Feb 18, 2011

how big and widespaced the fonts on Clementine playlist are and how good they look on the appmenu (where my mouse pointer is). This is not because Clementine is QT4, I've got the same problem with Chrome, Opera etc. I've been messing with system-settings (KDE settings tool) a day before the fonts become that widespaced in order to make my KDE apps look more native on my GNOME, but I haven't touched the fonts settings there.

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