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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0
votes
2answers
33 views

Setting interface NM_CONTROLLED to yes using nmcli in CentOS 7

I'm writing some documentation on configuring the network interfaces for a new CentOS 7 server, the specific section walks through setting the interface to a static IP address. The steps thus far ...
0
votes
0answers
53 views

IPSEC help using Strongswan on CENTOS 6.6

I have been tasked with setting up an IPSEC tunnel to our remote data provider. They require my Phase 2 traffic to be PAT'd behind a public address. I am using strongswan 5.3.2 on CentOS 6.6 on a ...
0
votes
1answer
3k views

Port Forward :80 and :8080 to Two Different Servers

On a CentOS 6 server with an IP address of 172.16.1.10, how can I configure iptables to route traffic destined for 172.16.1.10:80 to 192.168.1.10:80, and traffic destined for 172.16.1.10:8080 to ...
0
votes
0answers
35 views

service network fail [closed]

I was trying to make my IP static on CentOS but I got this error. I tried restarting the network etc but I get the same problem. At this point I am very confused because I have a long time without ...
0
votes
3answers
3k views

Empty kernel directory but kernel-headers are installed

Host - Windows 7 Guest - CentOS I am trying to install kernel-headers using yum since during the installation of vmware-tools I get a message asking for the path to the kernel header files for the ...
7
votes
1answer
3k views

How to shrink root filesystem without booting a livecd

I find myself needing to rearrange a system's partitions to move data previously under the root filesystem into dedicated mount points. The volumes are all in LVM, so this is relatively easy: create ...
0
votes
1answer
2k views

No IP address on VMware running centos 7

I just now installed Cent OS 7 on my VMware 8 and I am not able to connect it to a network. I checked the VM network and its mapped to the physical NIC. The same setting work like charm on my CentOS ...
1
vote
1answer
93 views

sssd realm discover: Not authorized to perform this action

I am testing sssd on CentOS and am unable to progress as per the error below: [root@sssd-testing ~]# realm discover realm: Couldn't discover realms: Not authorized to perform this action ...
2
votes
1answer
4k views

Unable to use yum repos whether with baseurl or mirrorlist in CentOS 6.5

Since a couple of days, I'm unable to retrieve repositories data with Yum, in my CentOS 6.5 server. I did yum clean all a dozen of times, it emptied all but didn't solved the problem. I tried to ...
0
votes
1answer
44 views

network.service Failed to start LSB: Bring up/down networking - Centos 7

I am experiencing an issue on Centos7 when attempting to start the network service. I receive the below error message. Failed to start LSB: Bring up/down networking The issue arised when I realised ...
2
votes
1answer
25 views

Bash shell script program that prompts for and reads two integers from the user.

Okay, so I been trying to figure this problem for a while and I'm coming up with errors left and right. This is my first time trying to learn the basics. So any advice would be helpful! Problem: I'm ...
0
votes
0answers
12 views

stop dm-cache from caching temporarily

I am want to benchmark my system(Centos) IOPS with dm-cache and without dm-cache.I have taken benchmark result for my system dm-cache .Now I want dm-cache to stop temporary so that I can take ...
3
votes
3answers
97 views

Why CentOS 6 adjusts console width when running screen?

I run a console window through my PuTTY session. That console windows has a column width of 140. When I start the screen session, the console shrinks to 80 columns. I do not see this behavior on ...
0
votes
1answer
1k 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?
1
vote
1answer
856 views

Dynamic wallpaper change on CentOS 6.3

Is there any possible way to change wallpaper (background) every five minutes on centos 6.3 with gnome 2.28.2 ? I found this Python script: #!/usr/bin/env python import gobject ...
3
votes
1answer
1k views

ioctl: invalid argument for HDIO_GET_IDENTITY

I wrote a program to get the details of hard disk drive using HDIO_ ioctl calls. For writing program, I'm referring Documentation/ioctl/hdio.txt in kernel source(2.6.32). Here is my main part of ...
1
vote
0answers
19 views

prelink - weird massive modification after installing zabbix-agent

I thought I knew something about prelink, but I ran into weirdest issue yesterday. I know I shouldn't use prelink, but I've noticed it is enabled on one of CentOS 6 systems under my administration ...
1
vote
6answers
769 views

I can not install MySQL using yum on Centos7

I've installed centos7 recently, but, when I am trying to install MySQL using the command: yum install mysql-community-server I keep getting Exiting on user cancel while I am not hitting any ...
0
votes
0answers
29 views

Improve CentOS performance while saving

When I save larger files at about 5 minutes of save time, Linux lags completely on my new computer. I can't change workspace or move my mouse. The files are about 50 Gb in size and are used for ...
1
vote
0answers
27 views

clang-tidy install

I have clang installed from packages on both Ubuntu 14.07, Centos 7 and Fedoara 22. I would like to use clang-tidy but can neither find a package nor how to install it without installing clang from ...
0
votes
2answers
1k 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 ...
1
vote
1answer
44 views

CentOS 7 fullscreen not working in VirtualBox

I installed CentOS 7 inside VirtualBox. Additionally, I installed virtualbox guest additions in the following way: yum update kernel* yum update yum install kernel-devel kernel-headers dkms gcc ...
0
votes
1answer
22 views

CentOS: Fatal error: Call to undefined function exif_imagetype()

On CentOS 7.1, I am greeted with the following error: Fatal error: Call to undefined function exif_imagetype() in /some/path/to/a/php.file.php on line XXX I can enable this in ...
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 ...
0
votes
0answers
31 views

How can I enable centos-release-SCL on Centos 6.7?

I am trying to install centos-release-SCL on CentOS 6.7. I want to do this to get python2.7. I have tried: sudo yum --disablerepo=\* --enablerepo=extras install centos-release-SCL Loaded plugins: ...
0
votes
4answers
4k views

httpd error: Address already in use: AH00072

I have a server, CentOs 6.5 which were installed xampp by a friend of mine. But I thought it's best to install apache, php and mysql from yum. I have it removed simply by using this #rm -rf ...
0
votes
0answers
9 views

can systemctl check dependencies across servers

I have recently started to convert init scripts to systemd style. I see that there is a "depends" and "require" attributes in systemctl service files that checks for dependent processes to be running. ...
2
votes
2answers
45 views

No space left on device on CentOS7

My machine which OS is CentOS7 have to backup 50G data into MySQL. But, there is no space left on the device. But there are many spaces on /home. How can I make user that there are enough space for ...
1
vote
0answers
92 views

SMB server not working after upgrade from 3.5 to 3.6

our Windows 7/2008 clients can't access our samba server any more after the upgrade to version 3.6. This is on CentOS 6 (rpm --query centos-release reports centos-release-6-7.el6.centos.12.3.x86_64). ...
0
votes
1answer
2k views

CPU idle is high, but processes are struggling to keep up as if the cpu is under heavy load

My centos is barely usable. Often times the terminal becomes totally unresponsive for several seconds, but that may just be lag from ssh, which would be strange because my server is connected to a ...
3
votes
1answer
19 views

Do I need to do something about “Delta RPMs disabled”?

While updating packages on our CentOS server I got the following message: Downloading packages: Delta RPMs disabled because /usr/bin/applydeltarpm not installed. Do I need to do something about ...
0
votes
1answer
2k views

What variables are valid within /etc/default/useradd file?

My /etc/default/useradd file is as follow: # useradd defaults file GROUP=100 HOME=/home INACTIVE=-1 EXPIRE= SHELL=/bin/bash SKEL=/etc/skel CREATE_MAIL_SPOOL=yes man page for useradd provides many ...
0
votes
0answers
6 views

Where is the “use empty space” option in centos 7?

I didn't find the "use empty space" (the option was available in centos 6) during the installation of centos 7. I need this option because I am using gparted to have a GPT partition and not an MBR ...
0
votes
0answers
27 views

How centos7 boot more than 2TB

We are struggling with booting a centos7 with 3To. We are working on an IBM BladeCenter H and SAN . There is no EUFI. Thanks for your help
0
votes
2answers
38 views

CentOS: How to install libyaml-devel from source?

I'm trying to install RVM in a CentOS server which for some weird reason I do not have access to internet. One of its dependencies is the library libyaml-devel. I already installed the libyaml ...
2
votes
1answer
5k views

SELinux Write access for vsftpd and samba

This should be easy enough I think, but I'm new to SELinux. I have a CentOS 6 file server. I have some LVM file systems at /var/media and I want to use both Samba and FTP to share them with a Windows ...
4
votes
3answers
347 views

What's the quickest way to find duplicated files? [duplicate]

I found this command used to find duplicated files but it was quite long and made me confused. For example, If i remove -printf "%s\n", nothing came out. Why was that? Besides, why they used xargs ...
0
votes
2answers
20 views

reverse slave DNS server zone file not transferred

I am using amazon free tier with RHEL 7and configuring master and slave dns server. From master everything is ok, but slave I couldn't find result. Also I would like to know how can I secure my dns ...
-5
votes
1answer
49 views

help with a bash shell script that creates directories

I have a problem I been trying to tackle. If anyone can help, it would save me a headache! For reference,I started self learning so I'll be looking for problems around but can't find the answer for ...
1
vote
1answer
25 views

Compare and merge config file in CentOS

I was trying to setup an auto-update (for multiple servers) bash script via cron to a config file (text based) by downloading the new file everyday and replacing it directly. The script works fine, ...
1
vote
1answer
1k views

LVM volume is inactive after reboot of CentOS

It seems there are many people with similar problems, yet I've found nothing that could help me. I ask here in hopes that someone might have a good idea. I've reinstalled a Linux server from CentOS 6 ...
1
vote
1answer
8 views

Error while installing Bcache on centOS

I am trying to setup Bcache on my existing system(Its risky,but we are not worried about losing any data ) . So my make and make install works proper but when I run the command make-bcache i receive ...
0
votes
2answers
835 views

How find and install PHP 5.3.10 or later on CentOS 6.5?

When I check yum list php it only shows 5.3.3 which is older than 5.3.10. How do I get and install the newer PHP? (Using CentOS 6.5)
0
votes
0answers
19 views

Centos 7.2 Convert single LVM to RAID Mirror Reinstall BootLoader

I am trying to convert a single-drive Centos 7.2 installation with LVM into a two-disk mdadm mirror with mrrored LVM. I was able to follow the excellent instructions at: ...
0
votes
1answer
23 views

Configuring Systemd to execute extra script after httpd start/restart using ExecStartPost setting not working

I need to have a PHP file execute whenever the httpd service starts or restarts. I found that Systemd has a configuration setting called **ExecStartPost, which looks perfect for what I need to do. I ...
0
votes
0answers
39 views

Centos 7 root passwd reset

I was stupid enough to log my root password on one spot and that crashed so I lost my root password to my server. I followed the guild of ...
2
votes
2answers
12k views

why can't this CentOS 7 server see wifi connections?

I recently installed CentOS 7 as the sole OS on an Acer Aspire T. There is no GUI, as it is a server with a terminal-only interface. What do I need to do to get CentOS 7 to be able to see and list ...
0
votes
0answers
15 views

custom ISO Bootable USB not working

I made a custom CentOS ISO using the link. My custom OS works on the Virtual machine, but I'm unable to install it using a bootable pendrive. Where could I be going wrong?
-1
votes
0answers
18 views

How can I make my CentOS Apache server be accesed from any network? [duplicate]

I am currently running an Apache server on a computer with CentOS 7 installed. I am able to access the server locally using the IP address 10.0.1.127. However, if I try to access it remotely from ...
13
votes
3answers
37k views

I Can't login as root with su command, but I can with SSH

How is it possible that I cannot log in as root by su root or su (I get incorrect password error), but I can log in by ssh root@localhost or ssh root@my_local_IP with the same password? I'm using ...