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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17 views

Kernel make install error for RTAI 3.8 on CentOS 6.5

Before posting I have read almost every similar post I could find on this and other websites but I haven't found an useful answer. I have to install a custom software that needs RTAI 3.8 on top of ...
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1answer
20 views

How To Resize CentOS CLI Machine In Full By Default?

I've created a minimal machine with no graphics using virtualBox, For I want to use a pure command line environment. One thing I don't like about it is, that it shows up in half screen. There's an ...
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0answers
35 views

Netcat missing -z flag

I have a script that checks if a server can connect to another one over port 443, I use the following command in the script: [user@centos6 ~]$ nc -v -w 2 -z 10.3.22.2 443 Connection to 10.3.22.2 443 ...
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0answers
212 views

How to solve [drm:radeon_init [radeon]] *ERROR* No UMS support in radeon module! in CentOS 7?

I watched my laptop reboot after a system update and there was an error mention that caught my attention. I issued a # dmesg | grep radeon and the results were: [ 0.000000] Command line: ...
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0answers
24 views

Firewall rules: banned localhost

I recently had an issue with a server that was refusing local connections. I was doing some wget domain.com/somePath. And while the resolution was correct and returned the right EXTERNAL_IP, the ...
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1answer
83 views

Install ELK in centos

I install ELK on centos following below link. https://www.digitalocean.com/community/tutorials/how-to-install-elasticsearch-1-7-logstash-1-5-and-kibana-4-1-elk-stack-on-centos-7 But the problem ...
1
vote
1answer
88 views

SSH access asking for password in local network but public

I have a problem when ssh to another server. I created ssh-key and copied it to other server. -bash-4.2$ whoami postgres -bash-4.2$ ssh-keygen Generating public/private rsa key pair. Enter file in ...
2
votes
1answer
59 views

Restart service after yum update?

Today I updated several of our servers using yum. 4 package(s) needed for security, out of 4 available Run "sudo yum update" to apply all updates. Three were openssh updates, one java. Do I need ...
1
vote
1answer
75 views

How can I view my virtualbox guest unix filesystem from the host windows file/text editor? [closed]

I'm running Ubuntu/CentOS in a virtualbox guest and am trying to configure various services to run on it (nginx, php, memcache and more). As a novice Unix user, I'm finding it slow to use the console ...
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0answers
147 views

How do I install php-gd on CentOS 7?

I need to install php-gd on CentOS 7. I have very limited repositories on my network. I cannot get a direct connection to the Internet with a Linux server. I tried to install ...
0
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1answer
98 views

need to install packages on CentOS 7

There are libraries and packages for Ubuntu which have this command: sudo apt-get install libopencv-dev libtesseract-dev git cmake build-essential libleptonica-dev sudo apt-get install ...
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1answer
30 views

How to backup rpm dependencies downloaded by yum while installing?

I need to install git on a machine which doesn't have internet connection. I am wondering if there is any option to ask yum to keep a backup of rpm and dependencies it downloads. OS: CENTOS
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1answer
16 views

I need help installing Ximera to a CENTOS server

I have a naked CENTOS server to which I would like to install the XIMERA package. https://github.com/kisonecat/ximera When I follow the steps given in the README file, I do fail to generate a ...
1
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0answers
40 views

Bash command history stops working after starting new tmux session

My bash command history stops working after starting a new tmux session. No previous commands when typing up, down, reverse search, no output from running history. I've confirmed that this happens ...
0
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1answer
28 views

I need to activate quotas on my centOS 7 machine

Okay. I'm very new at this so it might be an easy one for many of you. I have a virtual machine installed with centOS 7. I want to activate quotas for a specific user using the / partition. How can I ...
2
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1answer
132 views

No module named yum

I am facing errors while running any yum commands on centos 7 system No module named yum Please install a package which provides this module, or verify that the module is installed correctly. It's ...
1
vote
1answer
47 views

Adding user to ownership in addition to another user [closed]

I had some problems with permissions, the programmers of my website wanted me to add the admin user to the apache group and then set some permissions. My knowledge of Linux is quite limited, so I ...
0
votes
1answer
56 views

How to allocate available HDD from /home to /root [duplicate]

I have a 500GB HDD for CentOS 6.7 . But when I created a partition, I just have created a small storage size for root, but /home folder had lots of capacity. Could I move available capacity from /home ...
0
votes
1answer
20 views

Circular dependencies that cannot be fulfilled. PHP packages on CentOS 7 to support Drupal 8

I am trying to install Drupal 8.0.5 on Apache 2.4.6 on CentOS 7, with PHP 5.6.19. I get an error that PHP extensions are disabled. The detail I get is that it pertains to "gd." I have installed, ...
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0answers
45 views

CentOS 7, KVM.. auth failed: no agent available

So like the subject suggests.. CentOS 7.2 minimal + KVM install. I had the VMM working via X11Forwarding last night. After a reboot though I get this: authentication failed: no agent is available ...
0
votes
2answers
148 views

Why can't I find kernel headers on CentOS 7 when trying to install VirtualBox Guest Additions?

I have a minimal CentOS 7 installation as a VirtualBox 5.0.16 r105871 guest on a Windows 8.1 host. uname -r reports "3.10.0-327.10.1.el7.x86_64". When I try to run VBoxLinuxAdditions.run I get an ...
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0answers
15 views

Dual boot windows 8.1 and Centos 6.7

My os is windows 8.1,I want to create a dual boot pc with Windows 8.1 and Centos 6.7.I already closed secure boot,and boot throuth usb.But it can't load installed interface and occurred some wrong,as ...
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0answers
42 views

How to limit download/upload speed for all applications on CentOs 6.7?

Are there any ways to limit Download/Upload speed for all applications on my Server? I want to limit Download/Upload speed at rate 50MB/s. I have used WonderShaper to do that but it is not works ...
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0answers
46 views

Problem configuring static IP on centos 7, 6…,

I have 4 static IP addresses, I already used 143.4.198.0 and 143.4.198.1 (for Ubuntu server and it works pretty fine) I wanted to install Centos 6 or 7 I made the same conf like before I have a VM ...
0
votes
1answer
13 views

Can ifort and pgi complier coexist in the same system?

My linux cluster has installed ifort compiler now. But for some purpose, I need pgi compiler in the same computer. Can they coexist? I'm not familiar with this area, afraid of meeting trouble.
0
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1answer
106 views

Running systemctl vs systemctl status

I know systemctl by itself is supposed to give me all the running services and using systemctl status (with application name, ie foobar) gives me more details on that service. However I noticed I can ...
0
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0answers
21 views

GMA500 video chip uses mode that monitor can't sync to (even text mode)

I have a new CentOS7 installation which starts fine (I see the Grub2 menu). If I disable RHGB I can even watch bootup to a point - then all video disappears. The OS is booting to runlevel 1 (text ...
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0answers
56 views

Add AHCI to initrd on CentOS7 after installation

I built a complete CentOS7 system with lots of tools, preferences, etc in a VMware guest. Once working fine I moved it to my physical server. I managed to get grub2 installed and the bootloader now ...
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0answers
59 views

How does WonderShaper Work?

I'm trying to limit bandwidth download/upload for my server (Centos 6.7). I had read some documents and these are suggest that I should use WonderShaper. So i had installed and tried but it has a ...
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0answers
31 views

How to image a CentoS 7 i386 ISO to a USB device?

Usually if I want to image a CentOS 7 ISO (or any Linux ISO for that matter) to a USB device, I do this via dd as follows dd if=CentOS.iso of=/dev/sdX bs=8M However I've tried this method with a ...
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0answers
125 views

Centos 6.7 Yum Nothing to do error

My dedicated server is running on Centos 6.7 Yum does not seem to be working at all. Whichever package I try to install with Yum, does not work at all following No package "xyx" available and nothing ...
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0answers
26 views

Run centos 7 from usb flash drive

I've setup a system with 2 x 64GB usb flash drives as boot/root devices. The current installation looks like this: /boot on mdadm raid1 xfs / on btrfs raid1 no swap This works - os installed and ...
1
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0answers
123 views

yum update glibc - ERROR with rpm_check_debug vs depsolve:

I want to update my system with yum update but I get only errors starting with these two lines: Running rpm_check_debug ERROR with rpm_check_debug vs depsolve: Then, I tried only to update the ...
2
votes
0answers
41 views

How to set up thousands of VLANs on ISC DHCP-4.1.1-P1 server?

I have been attempting to set up a DHCP server using ISC DHCP-4.1.1-P1 compiled on CentOS 6.7 The idea is to have multiple thousands of VLANs. I have started small. I have no issue doing ifup on ...
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1answer
32 views

file transfer between host macine(win10) and virtualbox machine(centos 6.3)

I am trying to copy some files from my host machine to my virtual box machine centos. I tried vsftpd and share folder but it's not working. Please advise me on how to do it.
0
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1answer
44 views

Cannot yum install java CENTOS

Every time I want to install java on my machine, I get the following error. I tried this: yum clean metadata yum cleanall But I am still getting the following error! ...
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0answers
31 views

Centos static route

I have a load generator running on a Centos client and I need to alter the routing table on that client to send all traffic destined to a particular server(192.168.7.215) through a WAN ...
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0answers
18 views

Do I need these repos in my local CentOS YUM mirror?

I'm setting up a local CentOS mirror for three revs of the OS: 5, 6 and 7. Given that space is a premium, I'd like to pare things down where I can. With rsync, I'm already excluding ISOs for all and ...
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votes
2answers
80 views

How to use openSSH for disc encryption at boot time (OpenSSH vs. Dropbear)

Basic setup: - Operating System: CentOS 7 (64 bit) - Grub 2 - separate boot partition with ext4 - luks encryption (aes-xts-plain64:sha512) on two disc partitions which both need to be unlocked by ...
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3answers
81 views

Using rpm/grep to check whether multiple services are installed - as one liner?

The following code is used to check whether a service (read from variable, can be empty or up to X services named) is installed or not and take appropriate action. ... if ! rpm -qa | grep -qw ...
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0answers
46 views

Installing Octave on CentOS - incompatible BLAS library error

I am trying to install Octave on CentOS. After running sudo yum install octave ./configure F77=gfortran I got this error: configure: error: A BLAS library was detected but found incompatible with ...
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votes
2answers
59 views

Setting persistent environment variable in CentOS 7 issue [duplicate]

I have been trying to set enviroment variables that would be saved upon reboot, but without success. When I set variables using the export or setenv command, as root or any other user, it gets saved ...
0
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0answers
69 views

using cpu.cfs_quota_us and cpu.cfs_period_us to limit CPU usage

There are 32 cores in a system (2 cpus each 16 cores) and I want to limit a user to use only 4 cores (100% usage for that 4 cores). There are two kernel parameter for that according to the manuals: ...
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0answers
40 views

Vim not loading color scheme file at all

I have exactly same two CentOS 6 boxes. Trying to install vim and enable color scheme file. Same thing, same vim versions used but the color scheme works in one machine and not in other. Here are ...
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0answers
27 views

How to route to Virtual IP as gateway

I have environment on Centos 6.7 Final, 2 Loadbalancer failover (Haproxy, keepalived), 3 Web Server (nginx - PHP-Fpm). LB1 (Public x.x.x.233, Private 10.110.120.21), LB2 (Public x.x.x.235, Private ...
1
vote
1answer
160 views

Your kernel headers for kernel 2.6.32-504.e16.x86_64 cannot be found

I have centos 6.6 installed on virtualbox. In order to use features like copy/paste, being able to share folders, etc, I need to install Guest additions on it. I've clicked Device -> Insert Guest ...
0
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1answer
45 views

I have installed rpm where does it installation log save in centos/redhat 6

I have installed rpm where does it installation log save in centos 6. I mean which file stores the logs for installation and removal of rpm and when we rum command rpm -qa --last from which file it ...
0
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2answers
28 views

Best way to start multiple “screen” scripts after restart? (centos)

We are using centos. As soon as the server is restarted and the OS is fully loaded, we would like to have a certain user ("foo") start three or four scripts with screen. For example, screen -d -m -S ...
0
votes
1answer
76 views

KVM virtualization for CentOS 7

I am having an absolute devil of a time with KVM. It seems every HOWTO out there offers a different list of packages, and I've installed them all: [me@tarantula ~]$ rpm -qa | egrep 'kvm|qemu|virt' ...
3
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3answers
63 views

Creating a self-contained installation file for pymssql for CentOS

I'm trying to deploy a Python application on a machine that due to system and organisation requirements can't have gcc installed on it, so I need to create a self-contained installation file for ...