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

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default cpu affinity

On a CentOS 6 system with 32 cores, what could make all processes run under core 0 only? This is a system running nothing but a few stunnel processes actively. This is not a system we would set IRQ ...
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55 views

OpenVZ fails Container creating (Unable to get appcache tarball name for ve-basic.conf-sample with ostemplate debian-7.0-x86-minimal)

I have OpenVZ installed on CentOS 7.1. After I execute vzctl create 101 --ostemplate debian-7.0-x86-minimal I get command /usr/sbin/vzpkg exited with error 8 Unable to get appcache tarball name ...
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18 views

restrict access to certain directory lighttpd

how to restrict access to certain directory in lighttpd, block all ip's and only allow for my ip address. root directory is at /var/www . and i created /var/www/stats directory and symlink to ...
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41 views

yum update dependency in CentOS 6.6

After installing a rpm, by running sudo yum update in CentOS 6.6, I am getting the error Error: Package: qgis-python-2.8.1-3.el7.centos.x86_64 (neteler-QGIS-2.8-Wien) Requires: ...
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49 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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33 views

Implications creating System Accounts “useradd -r” Linux Fedora/RHEL/CentOS

I want to know what are the implications of create an account using -r option? # useradd -r ... The help says: -r, --system Create a system account. System users will be created with no aging ...
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38 views

Disabled root Access, how to use FTP

I removed the ability to login using 'root' to stop brute force attacks on my server, instead logging in as a regular user then 'su root' to the root if required. I need to use FileZilla to move, ...
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20 views

How to make a background service to capture commands and their output?

Is there anyway to make a background service capture all the commands executed by a user and also save the output in a text file?
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15 views

Centos Redhat Cluster LICI RUCCI

I have 3 systems [Normal Desktops College LAB] with 2 Network Interfaces each node1.test.com : Public IP : 10.10.10.2 Cluster Hearbeat: 192.168.1.2 node2.test.com : Public IP : 10.10.10.3 Cluster ...
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25 views

CentOS 6.3 - Firefox icon missing after reinstall

On CentOS 6.3, I have reinstalled FireFox to latest version using following set of commands: yum remove firefox cd /usr/local wget ...
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32 views

Have kickstart install TCPdump

I have a kickstart file for RHEL 6 and in the package section for the installing of the TCPdump command line utility I put tcpdump as the package name. Like I did with java and g++ in the kickstart ...
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79 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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90 views

PHP 5.6.10 Bad Installation on CentOS 7 using Plesk 12

I upgraded the PHP version from 5.4 to 5.6.10 with remi and while I am trying to access to a file.php I can see the full code in "Source code". I was reading about that and it seems that the ...
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52 views

Unable to access iSCSI target since Targetcli has been updated on Centos 7

Targetcli is able to run [root@controller ~]# targetcli targetcli shell version 2.1.fb34 Copyright 2011-2013 by Datera, Inc and others. For help on commands, type 'help'. /> exit Global pref ...
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33 views

can't start tomcat6(yum) org/apache/catalina/startup/Bootstrap (Unsupported major.minor version 49.0)

i installed tomcat6 on centos6 through yum, when i start tomcat6 (service tomcat6 start), it shows [OK] but, when i stop tomcat6 (service tomcat6 stop), it shows [failed], and i found exception in ...
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35 views

How to configure yum repo in centos 7

I have Installed CentOS 7 on my VMware. How to configure yum repo? What path do I have to give? ISO file is in my main machine.
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CentOS 7: What is the difference between applications.menu and gnome-applications.menu?

CentOS 7 using GNOME 3 comes with both "applications.menu" and "gnome-applications.menu" in /etc/xdg/menus. If I wanted to create a submenu for all users on a machine (i.e. NOT using alacarte), which ...
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173 views

Nvidia nouveau driver problem on CentOS 6.6

I'm having problems using the nouveau driver for my Nvidia GeForce 9100. Xorg starts up and works fine, I am able to use everything, although in /var/log/Xorg.0.log I have: $ cat /var/log/Xorg.0.log ...
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34 views

libltdl.so.3 cannot open shared object

i'm new in nagios and linux and was successful to install CentOS 6.6 and Nagios core using step by step guides here, but i faced the following problem with no reference in the internet how to solve ...
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236 views

Recover from emergency mode on Centos 7

I have a Dell PowerEdge R420 which has installed Centos 7 and was working fine. One day I removed the disks that Centos 7 was installed (2 disks with RAID-1 layout) and I installed another clean disk ...
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151 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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51 views

installing java on cent os 6.6 64 bit system

am trying to follow this link: How to Install JAVA 7 (JDK 7u79) on CentOS/RHEL 7/6/5 and Fedora So I downloaded the jdk tar and untarred it.However when I run java -version from within bin I get the ...
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32 views

Black screen trying to install CentOS 6

I've got a windows 8.1 Acer Laptop and I'm trying to put CentOS 6 on it as a dual boot set up. The laptop doesn't have a CD drive. I've already partitioned my hard drive. I've used Unetbootin to put ...
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146 views

ffprobe or avprobe not found. Please install one

I want to add tags to mp3 converted with youtube-dl & ffmpeg in CentOS 6: command line : youtube-dl -o '/Output/qpgTC9MDx1o.mp3' qpgTC9MDx1o -f bestaudio --extract-audio --metadata-from-title ...
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12 views

Create Snapshot an store it on a other server

Is it possible to take a complete Snapshot of my (VPS - CENTOS) server? with a script? And that it will stored on a other server? With snapshot i mean everything ( configurations, websites etc ) And ...
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108 views

DRBD Failure: (127) Device minor not allocated

I use wmware workstation to run two virtual machines with OpenVZ 2.6.32-042stab108.2 installed on top on CentOS 6.6. I have created another primary partition, /dev/sda4, to configure it as drbd ...
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211 views

fresh centos 7.1 install continually boots into “emergency mode”

I installed centos 7.1 on bare metal (dual boot with windows), with encrypted disk. Installed a few things (oracle java) and did a full yum update Now the system keeps booting to a console emergency ...
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78 views

What does “4m[terminated]” mean after restarting CentOS?

After installing CentOS 7 and restart it, it always promptd "4m[terminated]". After googling, I can't find the meaning of this phrase. What does this prompt mean? Will it affect normal OS functions?
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43 views

trouble with installing php-gmp on centos with whm

In order to use blocktrail sdk https://github.com/blocktrail/blocktrail-sdk-php I need to install php-gmp. I installed it on one server using yum successfully. But the server I need to use is ...
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51 views

Mod Speed Installation Error

I have 2 webservers Apache and Nginx. Trying to install mod_speed integrated with Apache but I get error: Failed dependencies: httpd >= 2.2 is needed by ...
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centOs 7 Bind 9 pki directories what is the purpose

i would know what is the use of this directory, because he caused some bad behaviors(permissions issue) with the named-chroot service. So i would know why named-chroot need it to start. he contains ...
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51 views

scp from a remote machine

I am having trouble moving files off a remote machine that we need to take down. I can SSH into the remote machine just fine but, when I try to scp the files out I get an connection timed out on port ...
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70 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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28 views

CentOS samba connection over an OpenVPN network

I have a CentOS 6 server that I am connecting to via OpenVPN and I would like to know how to get a Samba share working so I don't have to keep using ssh terminals. After I connect to the CentOS ...
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133 views

Centos 7 x64, RT3290

I use Centos 7 on Asus X550L uname -a Linux egor 3.10.0-229.4.2.el7.x86_64 #1 SMP Wed May 13 10:06:09 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux lspci | grep -i network 03:00.0 Network controller: ...
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99 views

fail to start graphical.target on centos7

could not start graphical target after installing kde from minimal centos. startx works fine though. the system has two vcpus and 1GB ram. $ cat /etc/redhat-release CentOS Linux release 7.1.1503 ...
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50 views

git add . error on dedicated server; fatal: Not a git repository

I was able to initialize a git repo on a directory containing one of our websites, but when I try to git add . I get this error: fatal: Not a git repository: ...
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21 views

Remove or decrease JAVA Security openjdk AWS centos instance

How to decrease or remove java security level in CentOS openjdk? I tried removing the java security level but I didn't find any option, my OS is in an ec2 aws machine.
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30 views

Moved CentOS VM From One Server To Another; Networking Issues

I was running a CentOS box on a VMware server and I had to move it off to another server. Since booting up on the new server, I have been experiencing networking issues. On boot, I receive the ...
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31 views

Subversion // installed and set, but fail to connect

I aim to get my own SVN server. I installed Subversion, all had been ok. I configured it <Location /myrepo> DAV svn SVNParentPath /svn/adlsvn #For any else ...
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42 views

How SYN and ACK packets counted by the server(Linux)

I have a question about tcp layer of linux kernel. I want, Syn and ack packages received to server will be counted. where total_syn_count and total_ack_count are variables to be defined and will ...
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21 views

How to remove previous version of centos7 and install fresh centos7 in Toshiba Satellite using bootable USB

My centos 7 has been corrupted. I want to install fresh centos7. When I run rpm -q kernel. It gives the following results kernel-3.10.0-123.el7.x86_64 kernel-3.10.0-123.20.1.el7.x86_64 ...
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CentOS 6 Include Gateway for Static IP Address

I've just set up a static IP Address for my CentOS Machine using the following settings in /etc/sysconfig/network-scripts/ifcfg-eth0 #eth0 Config #IPv4 DEVICE="eth0" NM_CONTROLLED="yes" ...
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73 views

Wireless configuration issue in centos 7

I am trying to enable usb wlan, TP-Link TL-WN722N, during boot. I am following instructions from CentOS wiki. Briefly, I modified the /etc/sysconfig/wpa_supplicant and ...
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63 views

How to mount VPS hard-drive to extend available disk space

I have an unmannaged VPS and recently and we upgraded the disk space from 200GB to 500GB. The VPS support wrote me the following message: Please take note that you have to mount the additional ...
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139 views

How to update squid proxy 3.5 in Centos 6?

Iam using Centos 6.6 with 32 bit os. Now i want to update squid proxy from 3.1 to 3.5 . Is it possible to update in centos 6.6 ? If it is possible, please tell me how to update it.
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CentOS 6.5: USB or DVD option wont show in boot menu

I downloaded CentOS 6.5 - I need this version for a particular reason - liveCD and used both Win32 Disk Imager and ISO to USB to create a bootable USB. However, after rebooting and manually bring up ...
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164 views

manjaro (xfce) menda dark theme in centos 7 (xfce)

I want 100% same look and feel of manjaro (xfce) (Menda dark theme) in centos 7. I found the theme and icons from manjaro github repo, but its not enough. The theme is not appearing properly. Still ...
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54 views

READ DMA Error after Installing CentOS 7

I have been trying to install CentOS7. After I installed it, I see the following message sporadically. ata2.00: exception Emask 0x10 SAct 0x0 SErr 0x4050000 action 0xe frozen ata2.00: irq_stat ...
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50 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 ...