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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How to recover an Intel RAID 0 on a Rocks cluster distribution

We had a Rocks 5.5 distribution on our cluster and wanted to upgrade to 6.2. The "/export" partition was mounted on a Intel software RAID 0 array of 2 identical hard drives (HD) (/dev/sdb and /dev/sdc)...
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53 views

Linux PAM: add specific lib to Makefile and compile a single module

I am dealing with the development of a custom PAM module for a CentOS7 system. As starting point, I'd like to use the project linux-pam, specifically: compiling only the pam_permit module; adding as ...
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3k views

Bash session errors on commands: “fork: Cannot allocate memory”

I have a bash session open to a remote server and something is wrong. I created a directory "test" and touched the files inside touch 1 2 3 4 5. I then tried to copy the directory cp test/ test2/ and ...
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54 views

Cyrus Performance Tweaks?

Okay guys, I have put a lot of research into this so bear with me. Here's what I am up against. I have been working with RC for a long time and I know some awesome SQL tweaks that work wonders, etc. ...
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2k views

Adding CentOS 7 to Active Directory

I am having a hard time adding a CentOS 7 machine to my domain (Active Directory 2012 running in Windows 2008 mode). I am using realmd to join the machine to the domain. Here is what I have checked so ...
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40 views

Libgcrypt warning: MD5 used - FIPS mode inactivated

Last week I enabled the openSSH FIPS 140-2 module on Server "A", and that system works flawlessly (including tsql queries to a SQL Server instance). I recently enabled the openSSH FIPS 140-2 module ...
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518 views

Centos 7 Mail log?

Previously I was using tail -f /var/log/maillog on Centos 6 When trying tail -f /var/log/maillog in CentOS 7 it says: cannot open ‘/var/log/maillog’ for reading: No such file or directory tail: no ...
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1k views

FIPS integrity test failed

I recently enabled the fips module in my CentOS 6 machine using this guide. During reboot, the system halted with this error: SELF TEST FAILED (/usr/lib64/hmaccalc/sha512hmac.hmac) dracut: FATAL: ...
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248 views

How to stream webcam on linux vps with videolan and output to html

It used to be quite simple to stream my webcam facing out into the yard to the world on my website. However, telstra has changed things where can't find a way to point my webcam to anything but local ...
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85 views

Can't setup mount of EncFS on user login

I've tried to setup EncFS to be mounted on user login as described in this guide excluding the Password Utility section, however it works with little success. The EncFS works properly (encryption/...
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299 views

Vagrant + CentOS 7 - Apache fails to start, I don't see an error

I'm spending some time trying to provision a Vagrant box running from a CentOS 7 base box. After a fresh install of Apache, I am able to hit the server over http and restart the server, but as soon ...
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198 views

CentOS 7.1.1503 Minimal cannot install Gnome Desktop via yum groupinstall “GNOME Desktop”

I've installed CentOS 7 as a virtual machine using virtualbox. That part worked fine and I've got my network connection working properly. I've updated yum and that worked fine. It would seem that ...
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245 views

Centos 7 - Can't download RPM (Trying to connect with IPV6)

I am normally an Debian/Ubuntu guy, but I wanted to test the foreman on CentOS 7, but I am having some trouble with the rpm command. I have tried to disable IPV6 with echo 1 > /proc/sys/net/ipv6/...
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83 views

iptables blocking incoming FTP traffic 2/3 minutes after being reset

On CentOS 6.6- At first, iptables was blocking access to my FTP server at all while it was on. After some research I added the lines to /etc/sysconfig/iptables that are suggested in the question ...
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62 views

How has this arrangement of RAID disks occurred and is it recoverable?

I some months ago set up two RAID arrays for a system under CentOS 7. I was somewhat confused that the device list included two entries for each array, i.e. one had /dev/md126 and /dev/md126p1. The ...
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436 views

Centos 7 GUI Freeze problem

I have installed CentOS 7 DVD ISO on my MSI GE70 Laptop that has geforce gtx 765m, when the GUI comes after 5 seconds screen freeze. Is this an nvidia problem? How can I solve it? I cannot disable ...
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1k views

CentOs7 Python 3.4 Install Method

This post relates to this question where I was asked to explain how I installed python3 on my system. I was attempting to install python3 on my system for development purposes. Something went wrong ...
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271 views

how do I mount an external hard drive connected via SATA Wire to CentOS 7

I have CentOS 7 installed as a guest OS inside VirtualBox running on a Windows 8.1 machine. There is a SATA Wire connecting the machine to an external hard drive that used to contain a dual boot ...
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633 views

PuTTY does not connect over SSH; other clients work fine

I have a CentOS system that I can connect to using several SSH clients (FireSSH, WinSCP, MySQL Workbench over SSH). For some reason, PuTTY, which was working a few days ago, can not connect. It will ...
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169 views

How to install a CentOS image manually?

I am moving my project from CentOS 6 to CentOS 7 and need to deal with the changes in the boot requirements introduced by CentOS 7, particularly the upgrade from grub to grub2. The gist of the problem ...
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123 views

compile ffmpeg centos

I used this Guide http://trac.ffmpeg.org/wiki/CompilationGuide/Centos To install ffmpeg in my VPS with CentOS 6 64. But it was installed in /root/bin/ and I need to install it in usr/bin/ to run ...
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1k views

saving file to usb stick while using linux boot stick

I am using the instructions in this youtube video to install CentOS 7 on a new computer that is running Windows 8. The tutorial uses UniversalUSBInstaller from PenDriveLinux, but the installation is ...
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1k views

USB WiFi on CentOS7

I've got a clean installation of CentOS 7 on a desktop PC and a USB WiFI Adapter (RTL8191SU 802.11n). Connecting through USB leads shows "USB Ethernet: connecting" in Gnome3's network status bar. ...
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775 views

Centos 6.6 not booting on Virtualbox on Windows host

I downloaded the QuickStart VM from Cloudera that has preinstalled Spark/Hadoop etc. I have been working on that for the last 4-5 weeks and it was running absolutely fine, but recently I had to ...
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301 views

cannot upgrade kernel (grubby fatal error: unable to find a suitable template)

I have an appliance (read: a PC in a rackmount chassis which sits in the rack and does its job for years without anyone really paying it much attention until it dies) running CentOS 5.4. Trying to ...
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163 views

Job for openvpn@server.service failed

here is the problem during starting the OpenVPN service.. Just after command systemctl start openvpn@server.service terminal shows message: Job for openvpn@server.service failed. See 'systemctl ...
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168 views

Install php apache module from source in CentOS 6.6

I tried running yum install php on my centos box however it kept installing an older version. Therefore I installed apache 2.4 and php 5.4 from source. However, I'm not sure how to install the ...
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165 views

Run 2 instances of xinit with output to separate video out

I have a video card with 2 video outputs. I want to run 2 instances of xinit and draw 2 different displays. I want one display to be output to one video out and the other to go to the other video out. ...
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273 views

SSD installed, but shows as HDD in command output

Strange issue here. I have a 480GB SSD drive installed in this server. I installed it myself. I see it, it's there. But, I'm getting an incorrect output on a typically used command to determine if it'...
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297 views

Using Cgroups with Systemd to restrict bash cpu & memory

I want to restrict every user on my Centos 7 server who is logged in via SSH. They should not be able to use, for example, a forkbomb and kill the whole system. The superuser will have no restriction. ...
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131 views

how do I migrate liferay from one server to another?

I'm trying to migrate liferay to another server (both are linux machines, and I'm using the CE bundle with tomcat7). I moved over the entire folder. This is not enough, because usernames/passwords ...
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340 views

Error running startx on CentOS via SSH

Whenever I attempt to run startx on a system I have SSHed into, I get the following output: xauth: creating new authority file /root/.serverauth.6604 X.Org X Server 1.15.0 Release Date: 2013-12-...
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296 views

Problem with usb's on CentOS

I have problem to recognize my USB devices on the CentOS 5.9(Final). Here are all the appropriate commands to help me debug me problem. dmesg | grep usb usbcore: registered new driver usbfs ...
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178 views

I2C driver support baud rate parameter

I have several test machines running CentOS release 6.5 (Final) and we are using Python 3.3 using the SMBus package to communicate over the SMBus (e.g., I2C). We are using the i2c-dev module. The ...
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526 views

PHP Fatal error: Call to undefined function mysql_pconnect() in

PHP Fatal error: Call to undefined function mysql_pconnect() in I'm using php version 5.3. server centos 6 I installed php-mysql. i don't know much about centos. Another server which is centos 5.9 ...
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137 views

How to enable Tcp\Ip remote connections in Centos 7.0

I am running Centos 7.0 using VMPlayer . I have set a private network shared with the host (Windows 7) . On my Centos Server i have opened a tcp listener on port 10102 . I could not connect to this ...
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876 views

“Error uncleared PCH FIFO underrun on transcoder A” during boot centos 7 on toshiba

I have toshiba Satelite model (C50 1001C model number) laptop. When I start it is giving 1.643361 [drm:cpt_serr_int_handler] *ERROR* uncleared PCH FIFO underrun on transcoder A 1.643363 [drm ...
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158 views

GNOME 3: bottom panel window order

I have centos 7.1. At bottom panel opened windows (running applications) are represented (ex: openoffice, thunrderbird, terminal). Question one - How can I change the order of these opened windows (ex:...
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150 views

PHP version info missing from Apache log on startup

I am building a LAMP server (CentOS 6.6), using a current server at work as a roadmap (CentOS 6.4). After installing PHP 5.5.24 and a lot of other modules (mod_nss, mod_perl, etc), everything seems ...
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145 views

Centos 6 and postfix: Internal emails deferred / telnet timed out from SSH

The problem is, that I have a VPS with centOS 6 installed, and I can send emails to anyone, but my own exchange server, Apr 29 11:50:30 amazonnet postfix/smtp[16535]: 2B6FF3CC49A: to=, relay=gmail-...
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46 views

Centos 7 FTP Hidden Directory Issue

After setting up Centos 7 with a web server standard install and LAMP stack. I installed vsftpd. Everything works fine and configured it to accept passive to enable gui ftp programs. However, when ...
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65 views

Cannot resize windows remoting-in through X11VNC?

As title says, I am remoting on to a Linux box (CentOS 6) using X11VNC. However, I cannot resize any windows manually by hovering over the frame, because the frame resize cursor does not appear. ...
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187 views

xterm window positioning

I want a shortcut to start an xterm window with specified number of columns and rows and from the specified starting points. I have CentOS 6.6 and the xterm's version is: X.Org 6.8.99.903(253). I ...
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264 views

error: cant't find command linux when booting system

I need some help with a problem when booting. Recently I've installed CentOS 7 on my pc, previously I had debian 7 and manjaro installed. When I installed manjaro I overwrote the bootloader of debian ...
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50 views

iptables not getting saved ? centos

I am trying to save the iptables, when I run command #service iptables save it says [ok] but when I again open the iptables the rules get revert to default. Can anyone help me to understand this ?...
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148 views

CSF not blocking port when removed from csf.conf

I have removed VNC port 5901 from the csf.conf configuration file and executed a csf -f a csf -x and a csf -e to flush and restart CSF. There is a vncserver running on port 5901 and when doing an ...
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316 views

Protected multilib versions: openssl

I'm running on Centos 6.2 x86_64 Trying to install ruby 2.1.2 ---> Package libselinux-devel.x86_64 0:2.0.94-5.2.el6 will be installed --> Processing Dependency: libsepol-devel >= 2.0.32-1 ...
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59 views

Preventing automount in CentOS 7

How can I tell CentOS 7 not to mount a new IDE drive (new to the system, but with data I want to examine) the first time I plug it in, so that I can do forensic analysis on it knowing I won't have ...
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545 views

Timezone problems with CentOS under VirtualBox

I have the following problem on a CentOS 6.5 system running under VirtualBox v4.2.4 on Windows 7 Pro SP1. date always prints a UTC time but with the correct timezone shown, e.g. if I run date at 12:...
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183 views

32-bit package from a repo that should only contain the 64 bit packages

Trying to a do install of some packages and it seems that it is trying to pull a 32-bit package from a 64-bit repo. Installing for dependencies: cyrus-sasl-lib i686 ...