Questions specific to the CentOS Linux distribution. Use this tag if your question relates to how the CentOS distribution affects your problem; do not use it if you just happen to be using CentOS and your question is about a specific configuration detail or syntax.

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9
votes
4answers
21k 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 ...
7
votes
1answer
6k views

Xvfb or Firefox throwing errors & gratuitously logging

per the answer to this question, I'm running Xvfb to make a virtual display so firefox will run on my CentOS server. (I don't need to see firefox or do any actual key or screen input/output with ...
5
votes
2answers
16k views

No network connection in CentOS 6.3 Minimal under VMWare Player

I'm trying to replicate in VMWare Player the exact same conditions I have under my Dedicated Server for testing purposes. Now, the thing is that that when I try to install something, or ping ...
4
votes
1answer
7k views

CentOS doesn't know what the internet is

So I've done my share of investigating this problem... I just recently created a CentOS 6 VM on my LinuxMint box using VirtualBox. I left all the recommended values the same upon creation (8GB HDD, ...
16
votes
7answers
54k views

CentOS 7 Installation Failed

After hearing the news that CentOS 7 had been published, I decided to install it on my computer. I downloaded the ISO image from the CentOS official website (the one named ...
8
votes
3answers
8k views

How to disable beep sound in Linux CentOS 7 command line? [duplicate]

I just installed the basic Linux CentOS 7 (no desktop) and am experimenting with the system. Every time I make a mistake (entering things that the command line doesn't like), the computer beeps and ...
7
votes
2answers
26k views

How to add an item to the Applications menu?

How can I add an application to Applications > Internet in Gnome Desktop running on CentOS 6.4? Per this old Docs link, it suggests to edit /etc/xdg/menus/applications.menu. How can I add ...
5
votes
7answers
540 views

Are there additional ways to protect SSH connections besides firewall and RSA Keys?

Sometimes I don't have a static IP and need to administrate my web server remotely. I'm looking for any additional layers of protection I could add to make opening port 22 safer. Currently I have ...
4
votes
4answers
37k views

What are the settings to correct vsftpd “500 OOPS: cannot change directory” error?

My question is what settings do I need to change and/or commands to run to allow me to log into my vsftpd system? I am getting this error, when I login using ftp instead of sftp: Name ...
3
votes
3answers
6k views

Issues in XRDP installation on Cent OS 6.5

I already went through the similar issue tracked in Installing XRDP on Cent OS 6.5, however it haven't helped me to fix. I am using MAC and trying to install XRDP in CentOS release 6.5 (64 bit). So ...
3
votes
2answers
4k views

yum - list configure flags/options used to compile package

How can I see a list of flags/options used to configure and compile a certain package in yum, without having to install it first? Say apache, for example. $ yum list available httpd Available ...
13
votes
1answer
18k views

Does yum's --enablerepo option only enable a repo for the current command?

Does yum's --enablerepo option only enable a repository for the duration of the current command? For example if the enabled setting in /etc/yum.repos.d/remi.repo file is set to 0 (disabled) and I ...
13
votes
2answers
28k views

how do I install the stock centos repositories?

I have a situation where the stock repo files that should exist in /etc/yum.repos.d/ (like centos-base.repo) are not present. I need to get them installed. I am sure this is simple, but after hours of ...
7
votes
2answers
5k views

Is it possible to add an item to the Nautilus right click menu?

I want to add an item to my right click menu, and run a command when a user clicks on it. I'm using Centos 6.2, is it possible? If yes please tell me how I can do this.
5
votes
2answers
11k 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 ...
4
votes
2answers
27k views

“Last” command: How to show latest user login?

As I know, the last command shows recent logins by all users. But my PC (CentOS) has been used for roughly a year, and there are many users logged. I tried to used the last command, but it just showed ...
4
votes
2answers
6k views

bridged networking with kvm

I'm trying to get a guest virtual machine connected to my network using bridging. I've come across a couple of resources online, but they seem to be out of date, deal with xen or Ubuntu or don't seem ...
3
votes
1answer
3k views

chkconfig bootup script failing, script runs good manually

I recently purchased a vps and I attempted to create a startup/restart script to start up my java program. I am running CentOS 6. The script works if I execute it manually with this command: ...
3
votes
3answers
8k views

CentOS use .pac file as proxy

I have to use a proxy with authentication to connect to the Internet. But I can't find any solution for this. I have modify my yum.conf, with a lot of possibilities: ...
3
votes
1answer
2k views

Start network service at boot time on CentOS

I've recently reinstalled CentOS onto a computer of mine. I have OpenSSH Server on it now, as did I before I reinstalled the operating system. Here's the difference: Before, SSH started without even ...
2
votes
0answers
155 views

How do I ssh into a new virtual machine?

note by derobert: problem was resolved in chat, starting around http://chat.stackexchange.com/transcript/message/24666451#24666451 if someone wants to write up an answer. Turns out the bridge wasn't ...
2
votes
8answers
2k views

Linux server monitoring software

The dedicated server I'm looking after started to crash occasionally, I suspect because of overload, so I need some performance/resource based monitoring software, preferably with web interface, ...
1
vote
2answers
402 views

why nginx holds file descriptions of logs?

on Red Hat Enterprise Linux Server release 6.6 (Santiago) nginx version: nginx/1.0.15 I use common nginx logrotate config, logrotate works fine and nginx creates new log file like access.log or ...
0
votes
1answer
8k views

How can I extend VMware Partition on Centos 7 using GParted?

I've a problem with increasing a partition from 20GB to 120GB, VMDK file. Here is what I've done: using vmware-diskmanager to increase vmdk file from 20 GB - 120 GB. It's ok. download and boot from ...
12
votes
4answers
51k views

Increasing Screen Size/Resolution on a VirtualBox Instance of Centos

I have VirtualBox instance of Centos 5. The screen size is quite small (800*600) and I'd like to increase it to 1280*1080. Under the Gnome preferences for "Screen Resolution" I only get the option for ...
9
votes
2answers
13k views

How to tell rsyslog to create log file if not there?

Default behaviour by rsyslog is to append traces to an existing log file. Now, I've seen (CentOs, Scientific Linux) that when rsyslog is already running, you delete the log file (e.g. the one ...
8
votes
3answers
2k views

Download ALL rpms for a product

I have two CentOS machines, one 6.3 box (A), and another CentOS 6.1. (B) 6.3 box is with internet connection, 6.1 box is without internet connection. I want to download ALL dependencies of a product ...
7
votes
2answers
10k views

GLIBCXX 3.4.15 on Centos 6

I need to install GLIBCXX 3.4.15 on my Centos 6 version (to run a server for a game on Steam). I've googled around and had several websites where they installed programs where the error appeared where ...
7
votes
1answer
14k views

chcon: can't apply partial context to unlabeled file while installing nagios with SELinux

I'm setting up Nagios core on CentOS with SELINUX=enforcing. I try to run chcon -R -t httpd_sys_content_t /usr/local/nagios/sbin/ as suggested in the manual, but I get this error messages: chcon: ...
6
votes
2answers
14k views

apache won't restart after adding VirtualHost conf file, why not?

In a CentOS 7 server, I get the following error when I type sudo apachectl restart after I add an include file at the bottom of httpd.conf: Job for httpd.service failed. See 'systemctl status ...
6
votes
4answers
18k views

What prevents a machine from responding to pings?

I have a CentOS release 5.4 linux box on Amazon EC2 that I'm trying to set up to be monitored via Nagios. The machine is in the same security group as the nagios server, but it seems to be ...
6
votes
2answers
3k views

Giving some users only SSH and shell access with limited resource usage

I'm trying to make a user that can access my server through SSH and allow it to have a shell, limited to using only, say screen and irssi. And it shouldn't it be able to see other directories except ...
5
votes
2answers
9k views

xsetroot, xterm and twm are not found when starting XRDP/Xvnc (on Cent OS)

I am trying to install xrdp service on one my VPS server, and though all installed successfully I get following error after connecting via Windows MSTSC service. Following are the resources I have ...
4
votes
1answer
124 views

how to eject/unmount usb dongle logically?

We've bought a commercial application who just work only if their dongle usb is connected to the server. However sometimes the application can not recognize the dongle, so it doesn't work, but if ...
4
votes
1answer
116 views

Pulling all of a process's swapped memory out of swap

How would one go about quickly pulling all of a process's swapped memory out of swap without writing to disk? The context on this issue is trivial, as the systemic issue necessitating the question ...
4
votes
3answers
3k views

Centos rpm -qa vs yum list installed

I want to have server b to have exactly the same setup as server a. My plan is to have a list of all installed things on server a and install it by using the list on server b something like : yum ...
4
votes
1answer
3k views

Does segfaults mean bad memory

This is a brand new server with a new install and fresh compile of Apache/PHP with nothing crazy. Just a WordPress site hosted and I get the following. Could this just mean bad RAM? If so how can I ...
4
votes
1answer
13k views

How can I install latest VLC player in CentOS 6.4?

I have installed CentOS 6.4 in my laptop, I want to know the method of installing VLC in CentOS 6.4, Is it necessary to download the vlc package and compile or can I use yum install vlc to install the ...
4
votes
2answers
9k views

CentOS - Issue with write permissions

I am running CentOS 6.4 and I have installed Wordpress on it. (along with LAMP) Now the problem is, that I cannot make any write changes to any files in the wordpress editor: eg. header.php, ...
4
votes
1answer
13k views

/proc/sys/kernel/hung_task_timeout_secs error

I am building a CentOS 6.2 webserver on a Hyper-V Cluster and have hit a major issue. The current setup is this: Operating System: CentOS 6.2. Minimal Server Install Installed software includes: ...
4
votes
2answers
5k views

Yum update error: “can't start new thread”

I found several posts on this, but none of them work. When I do yum update, I get the error thread.error: can't start new thread; full stacktrace follows: [root@ripper234 ~]# yum update Loaded ...
3
votes
2answers
183 views

No /dev/mmcblk0 during boot

I am trying to install CentOS-6 on an eMMC drive. Since the supported 2.6.xx kernel from CentOS-6 doesn't support mmc, I compiled a newer kernel (4.2.6) which has updated mmc drivers. I tried booting ...
3
votes
3answers
397 views

how do I build a bridge between two virtual machines?

I have used virt-install to create two CentOS 7 virtual machine guests on a CentOS 7 host computer. One virtual machine is called webvm, and hosts web sites on a private network. The other virtual ...
3
votes
0answers
104 views

pppd issue over serial cable

I'm trying to set up a ppp connection between 2 computers via serial cable, to enable TCP/IP over serial. Computer1 -> USB-Serial Converter -> Serial Cable -> Serial port of Computer 2 On computer ...
3
votes
1answer
10k views

Installing vpnc on CentOS

I'm currently attempting to establish a vpn connection, but I am unable to install a vpn client. I assumed installation would be as simple as sudo yum install vpnc, but CentOS is unable to find the ...
3
votes
2answers
2k views

Xen, bridge and multiple IPs on CentOS

There's a new server that is assigned 5 IP addresses. I want to use Xen to run several VMs with various services. This is my first attempt to install Xen, I use this tutorial as a guideline. Stuck ...
3
votes
1answer
11k views

gparted live CD can't resize a partition?

I recently ran out of space on a VirtualBox VM (CentOS guest) managed by Vagrant. It was using a .vmdk image, so I couldn't dynamically resize it. Following these instructions, I cloned the old image ...
3
votes
3answers
2k views

Trying to update php on CentOS 5.7

Apologies in advance - I'm not a good Linux user by any stretch of the imagination. I have a CentOS 5.7 dedicated server on which I host a few websites. I currently have php 5.2.10 installed, but ...
3
votes
3answers
1k views

Avoid pause during dm-raid initialization

On my CentOS 5 workstation I get a few seconds wait after dm-raid45 has been loaded ("Initializing Driver" or something like that). This seems to be part of the initrd. After that the system boots ...
2
votes
1answer
155 views

How to permanently disable root-password prompt for recovery mode, RHEL6

In the rare cases that a RHEL or CentOS 6 system is prevented from booting by (for instance) an improper shutdown, or a forced fsck-check failure on boot, the console will prompt the user for a root ...