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

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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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20 views

Converting a raw print data stream containing PCL commands to PDF

I have a program that sends raw print data through samba to typically PCL compatible printers. The program is written so basic PCL commands control how it prints. When sending it to the printer it ...
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19 views

Setting X display giver no protocol error [duplicate]

Here is the command i use DISPLAY=:0.0 sh /var/log/show_report.sh & disown This shell script just invokes the browser and here is error i receive No protocol specified Error: cannot open ...
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25 views

RPM installation %post macro works on terminal but not on GUI

I have created my own .rpm file. The installation works prefect on the command line but doesn't work properly when i am doing it from the GUI. The only thing that doesn't work from the GUI is the ...
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71 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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1answer
31 views

What exactly is a file offset in lsof output?

I was using lsof to track down deleted files that were still taking up space and I realized that I wasn't quite sure what an offset is with respect to a file. lsof's man page was less than helpful in ...
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39 views

Expanding root partition CentOS 6 With using fdisk

I am trying to expand the root partition on a VM which is not using LVM and I do not have (nor want to try and create then use) a disk to boot from. As such I followed what I felt was the logical ...
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1answer
12 views

RPM to invoke browser post installation

I am creating an RPM installer for centos 6.5, After installation i want the RPM to invoke the browser and show the installation report. This installation report shows the details of how the ...
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1answer
17 views

Docker CentOS7 image and locale compilation problems

I'm setting up a Docker image which requires localization support. I also need to patch the pt_BR locale according to comment #21 on this thread. So what I'm basically doing is reinstall glibc to ...
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2answers
38 views

In CentOs 6.6 how do I get an interface up?

I can see the interface with ifconfig but not with ip a. ifconfig shows no packets for eth0:1 The interface is down. how do I bring up eth0:1? [root@monitor01 network-scripts]# ifconfig eth0 ...
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1answer
80 views

CentOS: How is it possible to reset all your network configuration?

I'm not really sure the best question to ask in my situation, so let's go with "How is it possible to delete all your network commands?". Here's the situation: I have a CentOS 7 minimalist CLI ...
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109 views

Centos 6.6, resize partition

We have a Centos server as a virtual machine where the / path is getting full. So we want to resize the partition from 50GB to 70GB. I followed this guide ...
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11 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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33 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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59 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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118 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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1answer
37 views

CentOS 6 apcupsd Trouble Shooting

I'm having issues with the recommended UPS monitoring software apcupsd. It installed ok but when I run it and check the error messages it is getting spammed with all these messages and doesn't seem ...
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1answer
50 views

Alternative to adobe flash on centos 7?

Am unable to play content from sites like "hbogo.com" on my centos machine, as it warns me of having outdated flash player. As adobe is not supporting linux updates anymore, can you suggest me ...
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50 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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109 views

CentOS 7 - ssh login is refused when i use ssh public key, but only works with username password

I am not able to login via SSH key. I place my id_rsa.pub key in the /root/.ssh/authorized_keys [root@s .ssh]# ll total 4 -rw------- 1 root root 403 Jun 8 00:44 authorized_keys [root@s ~]# cat ...
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1answer
25 views

How to install CentOS 6.6 linux on an OCZ RevoDrive3 X2 PCI SSD

This took me a week, so here's the problem, and solution. From CentOS 6.5 onwards, the driver mvsas.ko recognizes the OCZ SSD... wrongly. It shows up as 4 small slow SSDs, instead of one big fast ...
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73 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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3answers
119 views

Software RAID 10 Array Space Loss

I purchased a dedicated server from a hosting company for a forum I am starting and the drives are configured as 4 x 64GB SSD's in a RAID 10 software array. The total amount of space I was expected ...
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1answer
172 views

SELinux is preventing /opt/google/chrome/nacl_helper from getattr access on the file /etc/passwd

Is this a bug or a real security concern? It appears to have been discussed but I still don't understand why this is happening and what is being done to address the root cause (I am not going to ...
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47 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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1answer
28 views

Install nemiver in CentOS 7

I am trying to install nemiver debugger in my CentOS machine. I followed the instructions listed here: Walkthrough. I got stuck however because despite the successful installation of ...
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1answer
36 views

Failed to create local repo in CentOS

I'm trying to create a loca repo in Centos 6.6, so: I created the file: [local] name=Centos $releasever-$basearch baseurl=file://var/pub/rpms gpgcheck=0 enabled=1 Then: mkdir /var/pub/rpms cp -r ...
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1answer
65 views

CentOS 7 - why the service file is not working to run my bash script?

How to make my bash script as service in CentOS 7? following is failing. $ cat /etc/systemd/system/mybash.service [Unit] Description=mybash Service After=network.target [Service] Type=simple ...
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81 views

how to make LVMs at available boot? kernel panic - dracut cannot find logical volumes after kernel upgrade in CentOS 6.6

I have a centoOS 6.6 vmware vm that I ran yum update on which upgraded the kernel after reboot, I started getting this: dracut Warning: No root device "block:/dev/vg_myhost/lv_root" found dracut ...
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1answer
18 views

Safely updating packages on Centos and custom compiled applications

I've inherited some Centos servers (6.2) that I want to get up to date, we have one dev machine. I'm starting off on the dev machine going through updates with security amendments, and applying ones ...
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29 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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45 views

CentOS Postfix changing mail server

I've been using Postfix on my CentOS 6 Server on it's default install settings but I would like to configure it to use the mail server from my existing email. I altered the /etc/postfix/main.cf file ...
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91 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 ...
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2answers
49 views

Test script/program/app to check if my website is live

I just deployed my webserver using Apache in CentOS and I was wondering if anybody has any good ideas in how to check every specified amount of time if the server goes down and then I can use postfix ...
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36 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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1answer
47 views

ffmpeg -acodec copy does not copy all audio stream to the new container

I wish i can find ffmpeg help here at stackexchange. I'd been re-encoding old videos to libx264 to save up some storage space, as I thought it should be working based on documentation seems failing to ...
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48 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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59 views

Apache (httpd) failing to start on boot - CentOS 7

i've just installed CentOS 7, so still getting to grips with it, but can't seem to figure out why Apache won't start on boot. I have enabled the service via systemctl, and if I start it manually then ...
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1answer
56 views

Install CentOS 7 through IBM IMM2

I'm trying to remotely install CentOS 7 (using the "Everything ISO" from official download page) on an IBM server with IMM2 (Integrated Management Module 2) using the Remote Control single-user mode ...
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1answer
53 views

AWS Outbound ACL Rules impact on incoming ssh connections

I am making a bastion ssh server on CentOS 7 in an AWS EC2 instance. When I use the following rules in its ACL, I am able to connect to the server just fine: Inbound Rules Allow traffic on port 22 ...
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1answer
43 views

Systemcrash suexec forkbomb.sh ulimits

i got this script named fork.sh: #!/bin/sh forkbomb() { forkbomb | forkbomb & } ; forkbomb if i call it trough suexec my whole system will consume 99% cpu. to prevent a normal bash forkbomb i ...
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1answer
83 views

Intel 6300 wireless card won't work on CentOS 7 - worked during install though!

I installed centos 7 on a laptop with an intel 6300 wireless card in it. During the install, the wireless card was available and I was able to connect to my lan. After the install, I don't see the ...
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1answer
65 views

CentOS 7 - while installing i set disk encrypted with password, but on reboot always it asking password

While installing CentOS 7, i put password for disk encrypt. Now while working remotely on that machine and doing reboot it always ask password to be inserted on-site. Is this normal? or there is a ...
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56 views

Files in folder /run/udev/data

Does someone know, when and how the files in this folder /run/udev/data are generated. I ask because I have a program, which needs udev in jail. But the version in jail is newer (version 208) than ...
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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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1answer
39 views

Connect to Samba Share across OpenVPN tunnel

I've recently setup OpenVPN for remote connection to our CentOS 6 file server. Server Static IP: 10.0.0.66 Remote OpenVPN IP: 10.8.0.1 However when using the OpenVPN connection I am unable to ...
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2answers
60 views

Problem to Install CentOS 6.4 (Second) after that Win7 (First) - dual boot

I want to install CentOS 6.4 in my PC, this image shows my Windows 7 partition before to install it But when I was ask to select my option (mode) of install CentOs like this: Or this (really is my ...
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5answers
86 views

How can i find out what is taking space on my system

I am trying to find out what files/folders are using most space on the filesystem df -h Filesystem Size Used Avail Use% Mounted on /dev/sda3 94G 85G 4.4G 96% / tmpfs 16G ...
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2answers
51 views

Setting up a static IP from ISP

I think my question might be an easy one but i struggle a little with setting up servers. I have a CentOS 6 setup. I have added Webmin and Virtualmin. I set this up with a static IP address and had ...