CentOS is an Enterprise-class Linux Distribution derived from Redhat Enterprise Linux sources freely provided to the public.

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322 views

PPTP: Allow remote clients to communicate with each other

I have a PPTP server. Clients log in to the server, but can not ping each other. The clients are at different locations. The problem is with my IPTABLES forward chain .... here is my iptables: ...
1
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2answers
12k views

How do you change the desktop theme in CentOS?

I have a couple of questions, and am a complete newbie, so please be kind. How do you change the desktop theme in CentOS? How does one download CentOS themes from the internet? How do you install ...
0
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1answer
285 views

Is there something wrong with df output? [duplicate]

I'm using the command df -h to check disk usage on CentOS 6.4. I see an inconsistency with the output. look at the line Filesystem: total 490Gb, used 55Gb, and Available 411Gb. What is it mean? I ...
2
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1answer
2k views

Locked out of server with SSH - anything I can do?

I accidentally locked myself out of my server. I changed the port, added ssh-keys, PermitRootLogin is 'no' and if I remember correctly PasswordAuthentication is also no. Logging in on another server ...
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0answers
331 views

How to reset linux centOS 6.0 keyboard shortcuts with custom changes to default one?

On Single Desktop Environment.... I created some custom shortcuts, but currently I want to revert all the changes to default settings (which having no custom changes). Example: created like CTRL + N ...
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4answers
15k views

ldd tells me my app is “not a dynamic executable”

I have a 32-bit application (called uclsyn) I received from an astronomy professor. I managed to get it running on CentOS a year ago, but now when I am setting up a new CentOS VM, it won't run and I ...
5
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3answers
6k views

Moved bin and other folders! How to get them back?

I accidentally moved all folders from root to a subfolder. (/bin, /etc, /home, /lib, /usr... all moved) The only ones that were not moved, since they were in use, are /bak, /boot, /dev, /proc, /sys. ...
2
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0answers
2k views

Can't Install ImageMagick on Centos using Yum

I am trying to install ImageMagick on my dedicated-virtual Centos server for use with PHP. I first ran the following commands successfully: # yum install gcc php-devel php-pear # yum install ...
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2answers
902 views

How to restrict rm -rf / in CentOS machine? [closed]

I would like to know how we can restrict rm -rf /on CentOS machines?
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0answers
542 views

Postfix not responding to telnet

I am doing a Postfix installation on CentOS 6.5 I can't get # telnet localhost 25 to do more than this: Trying ::1... Connected to localhost. Escape character is '^]'. EHLO ^] telnet> quit ...
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0answers
221 views

linux io stack analysis

I'm trying to understand the Linux IO stack by analyzing blktrace trace. Below is the trace i captured by executing simple fio sequential write with no Direct IO (5 x 8k request size). 8,16 1 ...
1
vote
1answer
966 views

no irq handler vector

I'm a Linux newbie and I've just installed CentOS 6.4 on my desktop machine. Everytime I start my terminal I get these error messages and I can't figure out why. How can I trace the problem and fix ...
0
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1answer
59 views

Rebuilding RPM results in “invalid numeric value”

I am attempting to add some config changes to Bash and repackage it as an RPM in CentOS x86. This is not something I've done before, so I'm at the mercy of info I've found around the internet. I am ...
1
vote
1answer
77 views

Using passwordless ssh on CentOS 6

I have a fresh install of CentOS 6 that I am trying to connect to using ssh without a password. But each time I try to login, I am asked for the password. Here are the commands in order: ssh-keygen ...
5
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2answers
6k views

Two ways to lock a password but only one to unlock

CentOS 6 Linux has two ways to lock a password: passwd -l usermod -L Today I found out, that they do something different. passwd writes two exclamation marks into the shadow file. # passwd -d ...
2
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1answer
8k views

Apache throws 403 Forbidden after moving DocumentRoot (CentOS 6.4)

I installed Apache via yum on CentOS 6.4. I changed the DocumentRoot in /etc/httpd/conf/httpd.conf to point to /home/djc/www: DocumentRoot "/home/djc/www" <Directory "/home/djc/www"> ...
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0answers
33 views

Internet working but not all of LAN!

I have recently installed CentOS 6.5. system is behind a firewall (institutional access) with an IP address, say, 10.50.28.99. It is not detecting (pinging or connecting via ssh) computers with ...
2
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2answers
1k views

Get list of top 10 memory consuming processes with graph using Cacti in Centos 6.3

I'm using Cacti in Centos 6.3 and I would like to get the list of the top 10 memory consuming processes, with a memory graph, so that if server fails I can easily find the processes behind that. It ...
2
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1answer
214 views

Does my VM need to be on the same LAN IP range to ping?

I have a home LAN where all internal IP addresses are in the rang 192.169.0.0-254. However, on one of those computers I have setup a CentOS VM, which currently seems to be set to 10.0.2.1. So the VM ...
2
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4answers
907 views

Keeping my production webserver updated

I have a production webserver (CentOS 6.5) and I just wanted to know how do I keep this updated interms of security updates and stable. For example, is it safe interms of not breaking anything on the ...
1
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2answers
13k views

Globally change path for all users, even in cron

We're setting up an SGE cluster with CentOS 6. My sysadmin is installing applications that are not installed via RPM (i.e. via other means like make install) should go in a non-standard directory, in ...
3
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1answer
4k views

Allow all users can write files/folders of user “apache”?

I run Apache 2.2.15 on CentOS 6.4 When a web local run a function and it created files/folders owned by user "apache". I can read these files/folders via samba but i can't write/delete them. I've ...
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1answer
225 views

Install a basic CentOS VM on Fedora 19 with libvirt

I would like to install a CentOS 6.5 virtual machine on my machine, only with command line tools and basic networking capabilities, i.e a way to have http and ssh connections between the host (Fedora ...
3
votes
2answers
4k views

HISTTIMEFORMAT modification. In /etc/bash.rc or /etc/profile? [duplicate]

I'd like to add the date/time to the output of the history command in CentOS/RHEL 6. I would like this to apply to all users on the machine by default. This itself is easy. It seems to just be a case ...
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3answers
86 views

Yum not working

When I try to execute yum I get this: My guess is I need to start the Ethernet connection because I cant ping and this is what what we do with SL6. I'm new to CentOS that is why I ask. I've ...
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4answers
241 views

Locating files and displaying their owner

I have to search for a specific file type on a storage unit and also want to know their owners. With locate '*.txt' >> result.txt I find all files I'm looking for but I'm missing the owner this ...
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2answers
358 views

No package community-mysql-devel available

I'm trying to get this package because I need it to build software on CentOS 6, but I'm getting this error: No package community-mysql-devel available I'm logged in as root, using yum. Could it be ...
2
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0answers
1k views

CentOS 6.5 sound permissions

I am trying to configure ALSA for a CentOS 6.5 minimal install, my problem is non-root users do not have permission to access the sound devices in /dev/snd because the files are missing access control ...
0
votes
1answer
174 views

How to automate route commands

For some reason everytime I connect to my VM I have to manually launch these two commands for it to connect to the Internet. route add 198.245.49.254 dev eth0 route add default gw 198.245.49.254 Is ...
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2answers
224 views

Moving a folder to a NAS mount

I currently have a small Centos VPS which has some local SSD disk - I am getting close to my storage limit as I am storing a lot of flat files which are accessed very infrequently so I am looking at ...
0
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1answer
213 views

Installing virtualmin over webmin

I'm setting up a CentOS 6 server, and I need to install virtualmin. The server already comes with webmin setup, but there's no way I can see how to access virtualmin, so I assume it's not been set up ...
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1answer
1k views

how to install Padre in linux(CentOS)?

How to install Padre IDE tool in Linux(Centos) for Perl scripting language?
5
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1answer
17k views

mount: wrong fs type, bad option, bad superblock on /dev/sdb on CentOS 6.0

Somehow my partition on /dev/sdb has gotten all buggered up. This hard drive contains a lot of data that I need to recover and haven't been able to backup yet. When I attempt to mount it: # mount -t ...
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1answer
533 views

SSH accesss between CentOS and Vmware installed Ubuntu

I am here to request the Linux lads about using the SSH type remote access between my CentOS (Host) and VMWare installed Ubuntu. I am not new to Linux but I am completely new with practical ...
0
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1answer
581 views

FFMPEG Conversion Fails

Bad file? I'm very new to FFMPEG so how can I better debug and trace these issues? ffmpeg -i /home/videospace/public_html/labo/lion.3gp new_video.flv ffmpeg version N-57647-g1880294 Copyright (c) ...
2
votes
3answers
134 views

How do I find out which RPM was used to install PHP?

I have PHP installed on a server and I'd like to know which RPM it was build off of (webtatic or remi). How do I find this out. Also, how would I find out if and when that changed?
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2answers
2k views

How can I install file-roller for CentOS 6 to use in Gnome?

I've just started messing about with Linux and trying to figure things out as I go using tutorials. I've installed Gnome desktop and have some .rar files I would like to open. I've found file-roller ...
0
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1answer
336 views

CentOS(6.3) Gnome Desktop Environment does not respond!

After starting the Gnome desktop on CentOS (version 6.3), I was able to see everything (the desktop icons, time and date, the upper titles for Applications, system, and so on). But, when I try to ...
0
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1answer
1k views

how to connect centos from windows remotely?

I am using Oracle virtualbox and I have installed centos 6.4. How can I connect remotely to centos with WinSCP from Windows? There are fields like "hostname" in WinSCP but I don't know what to write.
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2answers
719 views

why useradd havent created the standard files?

See I have created some user in my CentOS with useradd command. And I didn't get any kind of automatic standard dir creation and its not been versatile actually while I am creating that user. see the ...
1
vote
1answer
950 views

Worker MPM or Prefork?

I understand that there is a comparison topic between the two modules but this is different. I was contacting cPanel support in order to help me freeing up some memory usage on the VPS. They found ...
1
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3answers
6k views

iptables-restore just says “FAILED”

I am not sure what's wrong with my rule in the Iptables. I am actually trying to build a SSH server and following a cyberciti tutorial. My Iptables configuration looks like this: # Firewall ...
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vote
2answers
3k views

How to install red5 & Java on centos 6.4

There are many tutorials out there but not so many for 6.4 and it seems people are having problems with running either Java 6 or 7 and Ant. So does anyone know where to find a definitive guide? ...
1
vote
1answer
541 views

Unsure about java JDK for Centos 6.4

I have done a yum search java before installing anything to see if may have already. It comes back with the following: libreadline-java-javadoc.i686 : Javadoc for libreadline-java ...
4
votes
3answers
15k views

CentOS boot time screen resolution

I'm trying to set the screen resolution in /etc/grub.conf using vga= on the kernel line: vga=788 I'm using CentOS 6.4. That command should set the screen resolution to 16bit 800x600 according to ...
0
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1answer
263 views

Does CentOS 5.9 need Grub to run on hardware RAID?

I'm doing a fresh install of CentOS 5.9 x64 on a server with 8 disks in RAID5. At some point during the install, it gave me the option of configuring Grub, or not bothering. I chose not to bother, ...
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1answer
2k views

Fixing botched CentOS 5.9 Grub step

I installed CentOS 5.9 x64 on a fresh server with hardware RAID level 5. In my ignorance, I told it not to install Grub. The next reboot, I got a blinking cursor. So, I went back to the installer ...
4
votes
3answers
7k views

Trouble booting server from GRUB prompt

I just installed CentOS 6.2 on my server but it keeps going to the GRUB prompt. I've never used Grub before but did some digging online. Looks like I have to run the kernel command before I can boot ...
0
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1answer
2k views

What's the default boot parameter for CentOS 6.2?

I forgot to install a boot loader during LiveCD installation , since i've got other distribution resides in my system , i could add another entry into grub2 , but what's the default parameter for ...
0
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1answer
4k views

GRUB reported “error: file not found.” when booting CentOS 5

I installed CentOS 5.3 by using a 4GB USB disk on an old PC that I used run a Debian on it. After a series of housework on the fresh system, I reboot the system using: sudo shutdown -r now After ...