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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Low CPU load but slow websites

I had 2 servers with more than 200 websites on each. few days ago I purchased a new cpanel server and migrated both old servers to the new one. After migrating the first server everything was working ...
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1answer
46 views

chcon: can't apply partial context to unlabeled file '/usr/sbin/xrdp'

Sorry guys but I'm not a linux nerd (yet) and whenever I'm trying to execute this line to configure SELinux to install xrdp from this tutorial : ...
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1answer
27 views

Getting password prompt after editing sudoers file in cent OS 7?

Part of my sudoers file lines begingin with mukesh are edited: ## Allow root to run any commands anywhere root ALL=(ALL) ALL mukesh ALL=(ALL) SOFTWARE,DRIVERS mukesh ALL=(root) ...
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0answers
20 views

SELinux httpd CentOS

I'm having trouble with SELinux and Apache DokuWiki on my CentOS 7 box. First I was unable to read the html directory contents. I disabled SELinux to test and a test index.html that I placed there ...
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1answer
34 views

SOLVED Missing partition / drive Centos 7

I was trying to change permissions on one of my NTFS partitions and I think I have messed something up. I entered the below command on Centos 7 and now the partition is missing from the File Manager. ...
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1answer
13 views

When enter http://my_server_IP_address don't see Apache HTTP server default page

I just launch a VPS instance use CentOS 7 x64. I follow this tutorial for installing Apache HTTP Server sudo yum install httpd sudo systemctl start httpd.service but when I use my browser (at ...
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0answers
21 views

swap goes the second drive, how can I return it to normal from command line?

The following is my plan for partition of CentOS 6.7. I have two disks with A for system and files, B totally for backup. But, after installation, I log in using ssh root. Here is what I see: ...
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2answers
62 views

How do I install Python in Linux with no Internet access?

Part 1 I have CentOS with no Internet access. I have a docker container based on Ubuntu. I want to install Python inside the Docker container. I downloaded some .deb files for installing Python ...
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2answers
34 views

Cannot cleanup ghost mount points

'mount' command shows several mount points across several disk devices that I had previously setup: $ mount ... /dev/sdf1 on /mnt/<mp1> type xfs (rw) ... /dev/sdd1 on /mnt/<mp2> type ...
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1answer
51 views

Replacing a failed disk in a ZFS pool

I've got a large ZFS disk pool; 3 nested RAIDZ2 vdevs. I am documenting the process for replacing a failed disk for my colleagues and so simulated a disk failure by removing a disk from the host. ...
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0answers
11 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
13 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
25 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
71 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
39 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
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1answer
58 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 ...
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1answer
39 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 ...
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1answer
61 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
79 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 ...
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1answer
59 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
26 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
15 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 ...
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0answers
38 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 ...
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1answer
26 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 ...
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1answer
67 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 ...
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1answer
42 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 ...
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0answers
12 views

CSF / IPTables on CentOS

I am using Centos Web Panel which comes with CSF installed i have checked around on the internet on how to do this, but nothing seems to be working. i have added the rules to the firewall table but ...
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1answer
52 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 ...
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1answer
16 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
24 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 ...
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2answers
96 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
13 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
35 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
36 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 ...
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1answer
11 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.
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1answer
57 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 ...
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0answers
13 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
34 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
40 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
24 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
43 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
21 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 ...
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0answers
72 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 ...
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0answers
31 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
29 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.
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1answer
33 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
24 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
17 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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2answers
61 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 ...