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 disabled login for domain user in CentOS 6

I have all my CentOS 6 machines joined with samba and winbind to a windows domain (2008) and all users that I need to access those machines are in a certain AD group called "engineering". I also have ...
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12 views

lx92 server is not connecting from individual session but its connecting from Jump servre

Please help on this I have an issue in my environment my server Lx52 is connecting from Jump server IX4 but its not connecting from separate putty session Note :we are using Xen desktop through ...
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55 views

How do I get a manifest to run from my Puppet Master server to a Puppet Agent node?

I am trying to run a Puppet manifest for the first time on two new servers. But I keep getting errors. I recently set up two CentOS v7 servers. They have passwordless SSH between them. Ports 22, ...
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30 views

linefeed in bash script - to email

I am doing printf to a logfile and having that logfile send through mailx, however, it seems that the linefeed "\n" are not recognised or captured in the mail. Snippet of script as below (notice the ...
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61 views

Network not working after wake on lan

I just installed a fresh copy of CentOS 7 on my server at home, it worked great until I used etherwake to wake the server up. After doing so the network no longer works, I'm not sure if this is a ...
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116 views

stop while booting giving error of Genetrating “/run/initramfs/rdsosreport.txt”

I am getting following error while booting my centos 7 machine Generating "/run/initramfs/rdsosreport.txt" Entering emergency mode. Exit the shell to continue. Type "journalctl" to view system logs. ...
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52 views

Set firewalld on CentOS 7 for Cloudstack service and unistall iptables

I was following Cloudstack installation instructions, when I realized that iptables is not included in the OS, it was replaced by firewalld. So first of all I've shut down firewalld: systemctl stop ...
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55 views

Cannot access server outside of server`

I have a node server listening on port 80. If I send a request to it like this: request('http://127.0.0.1:80',function(err,res,data) {console.log(data)}) It works. It returns what I would expect. ...
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172 views

Winexe “failed to open connection - NT_STATUS_RESOURCE_NAME_NOT_FOUND”

I'm trying to run secedit on a Windows server using cmd, remotely from a Linux (CentOS6) computer. I installed Winexe for this purpose, but the command winexe -U username%password //host "cmd.exe" ...
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84 views

Centos 7 persistent static routes for any interface

I am trying to set up some static routes in a CentOS 7 box. The official RHEL says it is possible to add files in /etc/sysconfig/network-scripts/route-interface. This approach works, however I need ...
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57 views

problem with ABAQUS job on Rocks cluster

I created ROCKS6 cluster and i installed ABAQUS on my cluster and it works well on frontend, but i can not submit job on my 2 other compute nodes. I just want to run ABAQUS on this cluster (frontend ...
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102 views

Syslog stopped logging after using journalctl

Today I was configuring some things in my VPS running CentOS 7, and checked /var/log/secure several times without noticing any problems.Later I used journalctl to look for some cron logs, and now it ...
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98 views

Find reason of shutdown using var/log/messages

I am facing the issue of random shutdowns, I have attached the log messages if anyone can interpret and let me know what is the reason of shutdown, I will be more than grateful. LOG MESSAGES Jan 11 ...
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173 views

Can't install phpMyAdmin with PHP 5.6

I work on a Centos7 with php56 (via remi-repo) and httpd and maria-db I try to install phpmyAdmin via "yum install phpmyadmin" but every time I have this message: Erreur : Paquet : php-tidy-5.4.16-...
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102 views

How to install ABAQUS software on Rocks cluster 6.2

First of all sorry for my english. I create a new cluster with 3 . which one of them is frontend and two of them is compute . i should notice that, i am newest in linux and linux hpc clustering. I ...
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83 views

Unable to umount dvd on CentOS 7.2 kickstart installation

I have a kickstart file that was working fine on a RHEL 6 installation before, and now I want to reuse it to provide an automated installation on a CentOS/RHEL 7 DVD (currently testing on CentOS only)....
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137 views

Centos7 crontab @reboot sleep not working

I am currently trying to get my server to relaunch a few things on server reboot but they were failing due to screen not yet being loaded (I believe), in an attempt to fix this I added a 3min sleep to ...
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78 views

rsyslog not working

I have been trying to start the rsyslog service on centos 7 but I wont work. Please see te configuration file- # rsyslog configuration file # For more information see /usr/share/doc/rsyslog-*/...
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368 views

CentOS 7 blurry, fuzzy screen

I just installed CentOS 7 to Dell Optiplex 780 and I have problem with display. I am using two screens and they are quite blurry, fuzzy. You can see the problem (look at the terminal) - http://imgur....
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173 views

Installing qemu-kvm 2.5 on Centos 7

Are there any repos out there that carry the most up-to-date version of qemu-kvm as well as dependencies? I ask because the newest qemu-system has a HUGE list of dependencies and I would like to not ...
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22 views

Centos 7 i686 Log entries

It appears that my system has a built in bootable recovery image that appears when it doesn't boot to windows and it presents it self as a SMI USB drive. Linux is picking this up as SDE which doesn't ...
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67 views

Why can't I install CentOS 7 in dual-boot with Winows 8.1?

I need to build something under Apache Cloudstack. As for now I don't know exactly what, it needs to be some kind of application/project that would shows up some of the most relevant peculiarities of ...
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170 views

CentOS update from 7.1 to 7.2 with 2.6 OpenVZ kernel?

We are using CentOS 7.1: $ cat /etc/redhat-release CentOS Linux release 7.1.1503 (Core) We deferred the 7.2 upgrade. It looks like it did not cause any problems so we are planning an upgrade. The ...
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59 views

Aardvark Control Center wants TLS/SSE2 Library

Environment: CentOS 7.1 64-bit using Intel i7-4771 Gnome 3 shell I downloaded the Aardvark Control Center (Total Phase) and tried to execute the controlctr bash file, however I received the error ...
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40 views

Lots of strange disappearing connections to my Centos7 host

I run my website on a Centos 7 cloud instance. I log in via ssh, and to view connections I use 'ss -tap'. Whenever I first do this I see approximately two dozen unique IP addresses for 'users: httpd', ...
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98 views

PHP-FPM Permission denied on folders

I get read/write errors on a new CentOS + Nginx + PHP-FPM server, this is muy configuration Nginx user nginx; [...] fastcgi_pass 127.0.0.1:9000; PHP-FPM user = nginx group = nginx listen = 127....
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18 views

Devices for Analog I/O gone from /dev after reboot

I have a system using Centos 6.6 and another system using RHEL 6.6 on the same architecture that both need analog I/O drivers to communicate with sensors that will be attached to the device. Thus, I ...
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66 views

How to enable XRDP drive redirection in CentOS 6.6?

I have installed XRDP via yum on CentOS 6.6 x86_64. The XRDP version is xrdp-0.6.1-4.el6.x86_64. The connection via mstsc is successful. But I can not find the remote directory under the home ...
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14 views

ISCSI fetching files requires ISCSI restart

I'm using a FreeNAS for my SAN purposes. Both my ISCSI disks are mounted and can be accessed to read & write. However I'm using two systems, two virtual machine managers running on CentOS and when ...
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62 views

Failed to start GitBlit after Centos 7 update

I have a CentOS 7 machine that runs GitBlit 1.6.2. Everything was fine until I have updated the system (yum update) after which GitBlit doesn't come up any more with the following error: [root]# ...
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225 views

How do I add a Redis Cluster to a Pacemaker CentOS 7 Cluster?

I need to set up a CentOS 7 web server cluster that is able to manage user sessions while also load balancing across the nodes in the cluster. Towards this end, I have transcribed instructions from ...
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48 views

VSFTPD and ability to write to root

I successfully implemented VSFTPD on CentOS 7, however I would like to know if it is possible to write to the root. Here is a fragment of my VSFTPD configuration file. [root@Turbo media]# vi /etc/...
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63 views

Opening a file with Atom causes Xvnc to crash

We have some CentOs 7 VDIs and this problem is only happening on one of them. Whenever the user tries to open a file on Atom (v1.3.1), the Xvnc crashes (segment fault) and kicks him out. This is what ...
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183 views

Block IP Fragmentation attack using iptables

I am trying to stop all MF flag packet which has more fragment big set. because i have seen many IP Frag attack taking advantage of it. I know its not a good idea to do but, I have test my application ...
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216 views

Create CentOS-7.1 custom iso with upgraded kernel-4.2.6

I am trying to create CentOS-7.1 custom ISO with kernel-4.2.6. But I am facing issues while installing. Please see attached image for details. I have followed the following steps to prepare a custom ...
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57 views

Linux, LAMP, & Nagios server

as i'm somehow new in linux, and i'm required to install a monitoring system to our company using CentOS7 with LAMP & the monitoring Application NAGIOS. after installation everything goes well, ...
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49 views

How to rebuild a Centos base application iso?

I have a centos6.5 based application iso file which I want to change one of the RPM file and change some configuration in post kickstart file (there is a post kickstart file is in separate folder)and ...
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229 views

yum error on centos 7 vm with proxy authentication

I have installed CentOS 7 in VirtualBox on my Windows 10 system. My Windows system uses a proxy to connect to the internet. I have set up proxy settings in CentOS, through network manager and I can ...
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483 views

sudo and su hang indefinitely… stumped

I am trying to run su or sudo on my CentOS 6.6 machine. Every time I try to execute either command, I get prompted for a password. After entering the password, the command simply hangs. I can ctrl+c ...
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21 views

have very recent packages in CentOS

Normally versions of packages available in CenOS and Ubunti repositories differ, Ubuntu tends to have the latest-greatest versions, while CentOS is more conservative. Is it possible to add some repos ...
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29 views

centmin mod setup Domain Nameserver

I install centmin mod on my VPS. (ex. IP VPS 49.49.49.49) then i select option (2) to Add Nginx vhost domain then i create 2 vhost mydomain1.com and mydomain2.com. add my domain panel, there's 3 ...
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35 views

Disadvantages of certain filesystems when using a HDD in a Samba server?

I have found that using an NTFS drive in a CentOS 7 based Samba/FTP server is not so good, as after a few months of use, I was greeted with numerous read errors which required me to manually remove ...
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160 views

Apache httpd starts but enters failed state on CentOS 7

I'm new to Linux and i have some problems with restarting httpd after creating Virutal hosts. The service is running but i am unable to restart it. [webmaster@erichermansson conf.d]$ sudo systemctl ...
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73 views

TFTP is not working on this server/

I am running a centos 7 VM. This server is running a cruciblewds deployment. This uses tftp to serve the boot image to the computers. The server was running just fine, and then it quit working. I am ...
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22 views

Linux networking in VM ware

I have a doubt in Linux networking in VM ware. I have VM ware and i installed three Cent OS in them. I would like to network them all in a local LAN in VM ware itself. One among these three VM ...
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112 views

Unable to zoom-in Munin graphs on CentOS

I have installed munin on my CentOS 6 system. The installation procedure is as follows: rpm -Uvh http://download.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm yum --enablerepo=epel ...
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79 views

linux to linux IP MASQUERADING failed (can't ping ip server)

I'm new in linux, i'm trying to IP MASQ. So the diagram is like linux A is connected to HUB and Internet, and linux B is connected only to HUB. In linux A i have eth1 (10.10.10.5) and eth0 (192.168.1....
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52 views

xalan-c on CentOS 7 32 bit

I downloaded a 32bit version of CentOS from https://wiki.centos.org/SpecialInterestGroup/AltArch/i386 For a script, I need xalan-c. When I search for xalan with yum search all xalan, I get this ...
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29 views

Apache PostreSQL database server only

I was wondering if it's possible to use apache to make a postgresql database available for connections from the web without using a website to interface with the database. Instead of having a webpage ...
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47 views

PostgreSQL ssh connection from outside network

I have a PostgreSQL Server (CentOS 7) running on the network, it is set up to allow remote connections which works from inside the network. Any computer on the network can connect to it using ssh -L ...