CentOS stands for Community ENTerprise Operating System, the most popular Linux distribution for web servers with almost 30% of all servers using it. Third-party software is not included in the base.

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How to copy from guest OS (Windows 7) running inside Oracle virtual machine 5.0 to host OS (CentOS Release 4.0 final) or from host OS to guest OS

Need help to resolve copy and paste bidirectional from guest OS (Windows 7) and host OS (CentOS Release 4.0 final) or from host OS to guest OS I applied tick mark to bidirectional Drag'n'Drop and ...
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Resize LVM on KVM CentOS 6 VM

I've got a base image that I'm booting my VM's from. The base image is only 1.5GB. Different VM's will have different requirements for disk space. I've setup the VM with the default setting: VolGroup ...
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Why can I not view the /home folder as a regular user in Centos?

I'm on Centos 5 and I'm trying to view the /home folder with my regular user account. I have sudo rights I added my user to the same groups as my root user, but I still don't get permission to view ...
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tail/head all line except X last/first Lines

for example i have this file : cat myfile 1 2 3 4 5 i want to print all lines except first 2 line . output should be like this : tail -n $(( $(wc -l myfile | awk '{print $1}') - 2 )) myfile 3 4 5 ...
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Cloned CentOS not booting up

I recently cloned a CentOS6 environment from 1TB HDD and intended to restore its image to a 4 TB space. I used Clonezilla for this. The clone went successful, but after that when I tried to restore ...
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10 views

How to introduce “setx” command on CentOS 5.2

I'm working on a CentOS 5.2 system (I know it's very old, but it's the customer's choice). I am running a program, which internally performs some setx commands, but it seems that setx is not ...
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1answer
16 views

Cpanel/WHM not working [on hold]

Everything work fine, suddenly today afternoon Both cpanel and WHM stop working. But still the website and SSH work fine, But i am unable to open cpanel or whm, when i opening using IP ...
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1answer
13 views

Where is the email address for maillog set?

I've got a CentOS 6.7 system that currently emails a certain address to send system messages (for example, it emailed with the body "Terminated" to indicate a process spawned by cron that was killed ...
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5 views

How do I setup a tmux session to always use a particular scl?

I'd like to be able to setup a tmux session that more or less transparently runs everything in a particular scl environment, specifically scl enable python27 .... By transparently, I mean that when I ...
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Virtual Box Cent OS can't highlight mouse in desktop issues

I am using CenotOS under the VirtualBox, I started to have this problem with the mouse, right or left click does not work on the workstation(desktop?). It started with the clicking not working in my ...
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1answer
15 views

Apache on VM is not reachable from LAN

I have a CentOS machine installed on VMware Fusion and connected to my LAN through a bridge connection. Everything works fine, I can Surf on internet from the guest machine. Ping other network ...
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10 views

VLC in Centos6 fails to play DVD

I installed vlc into my Centos 6.7 from epel and nux-dextop using these instructions. Install went OK but there are problems in playing DVDs. I managed to play a DVD containing material I recorded ...
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Virtual memory size same Python application on Centos 7 and RH 5.2

Is there a reason why the same python app and code consumes about 90MB of virtual memory size in Red Hat 5.2 32bits python 2.4 and abut 300MB in Centos 7 64 bits with python 2.7? Both app's versions ...
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165 views

How can I set up remote capturing in Wireshark, capturing from a CentOS server on my Windows laptop?

I'm looking to capture packets from a remote server network interface. The remote server is running CentOS and has tshark installed. I'm working on a Windows 8 machine with Wireshark installed. ...
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1answer
5 views

CentOS 6.7 configure: error: dlopen not found

I'm trying to configure LibreOffice On-Line WebSocket server before installing but the following error is thrown: configure: error: dlopen not found Full output: [root@SBX-EXT-001-002 loolwsd]# ...
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1answer
27 views

Windows 7 host, CentOS guest - internet connection

I have troubles connecting a CentOS guest on Virtualbox running on a Win 7 host. The host has been given two adapters: Host-only and NAT. ip a vi 03 Note: setting GATEWAY=10.0.2.2 still results ...
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34 views

Hyper-V 2012 R2 different disk speed on CentOS and Debian

I found unexplained difference between running CetOS 7.1 and Debian 8.3 on Hyper-V 2012 R2. I create similar VM on similar hardware. Both virtual machines installed on 600 GB SAS 15K in RAID0 via ...
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1answer
24 views

centos login in the first time

I'm a beginner to play Linux. And I've installed Centos into the VMware. However, after I set the settings, the windows run the all black window and ask me to login. Of course, I key my account and ...
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1answer
12 views

Centos Sftp Ssh - How always create files with rwx-rwx-r-x and always owned by a certain group

I have a user myuser, which is only allowed to connect to ssh via sftp. I'd like this user to always create files with rwx-rwx-r-x and always owned by the group apache. I've tried to accomplish the ...
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28 views

Centos - PhpMyAdmin showing blank screen

I have just installed PhpMyAdmin, and when i try to access it it just shows a blank screen. I suspected this is because i followed a tutorial on how to secure php and disabled multiple settings, so i ...
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11 views

Customize telnet login

I'm trying to customize the login screen on my CentOS server but I can't for the life of me, figure out how to change the actual login prompt, when the system asks the user for a login name. I want to ...
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9 views

Taking a 'snapshot' of centos 7

So I am trying to basically move all my settings/files on my Centos 7 server elsewhere. But I am unsure as to how should go about this. I researched on what I should do, and I came across a digital ...
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21 views

Telnet script without logging in

first of all I'm new here, so I apologize if I make any mistakes. So I wrote a python script to check a database for some information and I would like to make it publicly available through Telnet. ...
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1answer
23 views

copying ssh id from debian to centos times out, how to debug?

I'm setting up another pc on my network. it will eventually be headless. It currently boots into the centos CLI ~ which is fine. now i want to copy over my ssh rsa key from my main debian pc to the ...
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10 views

How do I create a Docker container with a non-default IP address?

I created a docker container with this command: docker run -p x.x.x.x:80:8080 <imageName> bash where x.x.x.x was the IP address of the Docker server running CentOS version 7. I then tried to ...
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32 views

I can Telnet into a Linux CentOS system but cannot SSH into it. My colleagues say they can SSH into it

My company has a server (server A) in a data center belonging to a telecoms company. The server has no access from the internet. I need to access this server because of a server application that I am ...
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1answer
7 views

ipset -j SET --add-set notwroking in cetos

I recently installed ipset rpm and kmod-ipset rpm for my Centos (Linux 2.6.18-194.11.3.el5 i686) and try to hands with help of some examples from internet, but when I try to ban user who tries to ...
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7 views

How to fix Nemo file explorer as crashes frequently in Linux and asks for root privileges to fix the error?

I have Nemo installed on Centos and Fedora, on Gnome classic and Mate Desktop, crashing every now and then and asking for root privileges to fix the issues found but other explorers work just fine. I ...
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2answers
72 views

Connection refused when trying to SSH. But port 22 is not blocked. Pings work

Connection refused when trying to SSH. But port 22 is not blocked. Pings work. I'm running CentOS 7 VMs and open source Docker. I want to SSH to Docker containers from other VMs or other Docker ...
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1answer
31 views

Convert init script to systemd - executable path is not absolute

I am trying to convert one of my init scripts to systemd but to no avail. [Unit] Description=My Service After=network.target Wants=mysql.service [Service] Type=oneshot ...
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1answer
41 views

Cannot restart apache on Centos 7

I cannot restart HTTPD on Centos 7. When I try to run the command it shows this error below. How can I overcome this? -- -- Unit session-735.scope has begun starting up. Apr 12 15:33:01 ...
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490 views

Failed to adjust OOM score of renderer with pid X: Permission denied

I'm not sure what exactly causing, but I'm getting following error: Apr 11 12:30:00 X alacarte-made-2.desktop: [1712:1735:0411/123000:ERROR:zygote_host_impl_linux.cc(162)] Failed to adjust OOM score ...
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1answer
65 views

Samba 4.2.3 - Access Denied to Home folder as root user

I am running CentOS 7.2 x64 with Samba 4.2.3-12.el7_2. My Samba config is as follows: [global] server string = log file = /var/log/samba/log.%m max log size = 50 guest ...
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18 views

Windows 10 access to CentOS

How can a windows 10 user access the CentOs Linux 7.1.1503 over samba server? Windows 7 and 8 users are able to access but Windows 10 user.
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Startup script unexpected results

I'm experimenting with a small script to setup my webserver on Vultr. This is a "Startup script" that is used by Vultr on the background after deploying a new machine for me. If I run manually with ...
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1answer
19 views

What does the 'g' mean under VIRT in “top” on linux?

The output from "top" for a server of mine says this: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 64860 mongod 20 0 16.721g 81016 16820 R 0.7 4.7 18:37.66 ...
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8 views

ClouderaVM in 2 Different Machines are not Pinging Each Other

I am using cloudera-quickstart-vm (VirtualBox) in 2 different systems with bridged mode of networking to implement hdfs (in a distributed manner). Host System: Windows 7 Guest OS: CentOS 6.5 ...
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45 views

Two network cards, one directly to internet, other in LAN

I need some insight in my thinking so that I don't do something completely stupid. I have two physical network cards on my computer, one card/interface offers a handful of services and the other is ...
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1answer
51 views

Yum repo with python 2.6 on Centos7

I need to run Nodejs 4 on a CentOS 7 machine. I have a limited internet access on this machine and basically can only hit Yum repositories (I can add new ones). Since Nodejs 4 is not available even in ...
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1answer
15 views

How to copy file only if file sizes between src/dst differ?

I wish to perform a file copy like: cp --verbose /srcfile /dstfile But I only wish to perform the copy if dstfile does not exist or if the dstfile filesize differ from the filesize of srcfile. How ...
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1answer
62 views

Security regarding nginx + php on CentOS 7 with OwnCloud 9

I'm trying to setup a OwnCloud Server v9 for my freelancing purpose. SPECS: - CentOS 7 - nginx - php I'm a little bit confused. I can find only the info about the PHP Version 5.5 in the ownCloud ...
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2answers
48 views

Error SSH to a Centos 7 VM (Host-only)

I have the following setup: Host System: Debian Wheezy VirtualBox System: Centos 7 Network Adapters: NAT and Host-only On the host system I can "ping" the VM machine, when I try to ssh I get the ...
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2answers
45 views

GCC and G++ upgrade to 4.8+ on CentOS 6.7 32-bit

I used: yum -y --nogpgcheck install devtoolset-3-gcc devtoolset-3-gcc-c++ to upgrade gcc and g++ from 4.4.7 to 4.8+ it installed : devtoolset-3-gcc-4.9.1-10.el6.i686 ...
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Reverse DNS setup not working - BIND on CentOS 7

I haven't setup BIND before but am quite knowledgable with DNS (I'm from the Windows world). I'm having a reverse DNS issue. Forward DNS is working fine for the zone int.linuxlab Here are the ...
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188 views

How to have MySQL entitle the machine's root user?

I'm trying to run mysqlcheck. Its failing with: $ sudo su - # mysqlcheck --auto-repair --all-databases mysqlcheck: Got error: 1045: Access denied for user 'root'@'localhost' (using password: NO) when ...
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Trouble setting up mail server(postfix, dovecot) on centos

I'm having trouble setting up my mail server, i have followed this tutorial: http://www.krizna.com/centos/setup-mail-server-centos-7/. Now i'm trying to send mails to my outlook adress, but i can't ...
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18 views

pulseaudio halt with C-Media usb audio

pulseaudio will enter an uninterrupted wait when my c-media usb audio device is plugged in/activated. pulseaudio -k wont kill it (even with autospawn = no), nor kill with SIGINT or SIGTERM), and the ...
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1answer
16 views

One user, multiple desktops tigerVNC

I was wondering if there was a way to "share" a user through tigervnc such that if both are logged in, both see their own desktops. I need something similar to screen in ssh. I've tried connecting ...
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1answer
46 views

Operating System not found, to install CentOS 7 on VMWare Workstation 12

I want to install CentOS 7 on VMWare Workstation 12. After I created a virtual machine and clicked "Power on this virtual machine", I got the following error: What is wrong?
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Why is a user only added to one group at a time?

I have a limited knowledge of Linux systems, so bare with me :) I'm trying to add Apache and a user called admin to the same group on CentOS. When I run id admin I get groups 1000 (apache) and group ...