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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Extract From tape Brightstor/Arcserve Linux?

I have some SDLT II tapes that were made with brightstor a few years ago. I don't know anything about the tapes besides that fact of who made them. When I try to see how data was stored on the tapes: ...
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16 views

Centos 7 - Sendmail not working

I'm trying to setup sendmail on my centos 7 server, but it's failing for some reason. I've opened port 25/tcp on firewall-cmd and selinux is disabled as well. It's still not working... /var/log/...
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18 views

Virtualbox Bridge vs NAT (same setup, NAT works but bridge doesn't)

I installed CentOS 7 on a virtualbox machine. When I set the network to NAT, ping gets packets back, wget gets pages and yum also works. However, if I shutdown the machine and set the network to ...
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20 views

Take down firewall for interface on Centos 7

I am exporting a few items over NFS, but my clients can't mount them. When I try to showmount -e myServer I get clnt_create: RPC: Port mapper failure - Unable to receive: errno 113 (No route to host)...
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16 views

CentOS What's Taking Up My Memory?

I'm running a KVM on CentOS 6. I have 387GB installed on the machine with 186GB allocated by VM's (I've verified this via virsh). I should have 201GB free. However, when I look at available memory I'm ...
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6 views

unable to install s3cmd on centos

I tried the following commands to install s3cmd on centos on centos-release-6-8 cd etc/yum.repos.d wget http://s3tools.org/repo/RHEL_6/s3tools.repo yum install s3cmd last command output "Illegal ...
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20 views

my tab key behaves strangely in CentOS gnome terminal only in empty shell prompt

In my CentOS 6.7 GNOME desktop, something went wrong while I was trying to show a document to my daughter. I must have pressed some keys by accident. The strange behavior is, when I press tab key in a ...
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8 views

Plesk failed to upgrade on centos 6

I am unable to upgrade existing Plesk 12.4 update 23 on centos 6.7. The log shows that the upgrade script is trying to fetch data from a non-existing folder in opensuse repository. Have some faced ...
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27 views

RAID1 Partitioning Scheme for a Linux Server

I'm having trouble setting up a RAID1 for my server where both drives are bootable. What I'm doing now is /biosboot and /boot partitions on both drives, then I have my LVM volume group with logical ...
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19 views

Restarting mysqld on CentOS 6.6

I'm trying to restart my mysqld process on CentOS 6.6. I have root access to the server and when I run top, this is the first line: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND ...
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3answers
48 views

Meaning of netstat output?

When I type "sudo netstat -an", this is part of the output I get: Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 192.99.202.17:39922 ...
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7 views

Install netbeans from a private IP machine in another remote public IP machine using SSH

I am sitting in a private IP machine (local) and want to install netbeans in another remote public IP machine (remote). The local machine runs Ubuntu and the remote machine runs CentOS. I have ...
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2answers
36 views

How to solve low disk space on /boot/ in CentOS 7

I am getting Low Disk Space on /boot/ in CentOS 7. I got this error since I recently did yum update. The df command shows 100% usage on boot folder. Following are the snapshots.
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1answer
18 views

Changing terminal name in centos

I am very new to this centos terminal and aws. I would like to ask you how to change the terminal name and replacing the default name with ec2user@ip. Please help me out.
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1answer
50 views

Move Linux Partitions, Dual Boot with windows

I'm not thinking about Expand Linux Partitions... I need Shrink (one, the larger) and move it (two, with the swap)... Here my HD from Windows View (Disk Management) Now, I want to reduce the last ...
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1answer
20 views

Using Master Node for Internet

So I have a cluster of about 30 nodes. 29 nodes are run from the master node, which controls all the other nodes. Master node has access to internet. However other 29 nodes do not have access to ...
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1answer
101 views

CentOS SFTP chroot

I've some issues chrooting an SFTP access for a client. I can access the directory, but the problem is I can't read / write, I can just access the directory. Below is what I've done : # cat /etc/...
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1answer
38 views

Failover between multiple gateways

I have a CentOS server running Centreon (a monitoring solution similar to Nagios) to monitor devices in multiple networks. The server could access the internet via 4 different gateways/routers, each ...
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Teamcity: sorry, you must have a tty to run sudo when running “bundle install”

Background I am trying to run cucumber scenarios on centos (via teamcity). The first step of the build configuration is: bundle install However, this just gives me the following errors: [12:39:52]...
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27 views

Vim isn't recognizing my vimrc file

I'm attempting to copy over my local vimrc configuration to a new linux server I've just set up: scp -rp .vim/ nagios:~ scp .vimrc nagios:~ Then, with ls -hoal on the remote machine in my ~ ...
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17 views

CPU usage of named daemon on CentOS 6

I'm having an issue with the name server daemon using up more CPU than I can understand. I got to this issue while trying to figure out why the VPS I'm running feels slow. First off, the problem of ...
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30 views

How do I get bash history for users running commands via PHP shell_exec()?

Is there a .bash_history or something similar stored out of memory when running shell commands via PHP's shell_exec() or backticks? PHP is running Cloudlinux+FPM multi-tenant where each user owns its ...
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1answer
13 views

Trying to edit file in vi and it crashes [1]+ Stopped

Found this question, this is what I see: Swap file error message while trying to edit .vimrc file? But in my case, I can delete swap files, try to edit file and Ctrl-Z and I get this: [6]+ Stopped ...
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2answers
30 views

Centos 6.4 in VirtualBox fail to start eth0

Two interface files are in /etc/sysconfig/network-scripts, ifcfg-eth0 file: DEVICE=eth0 HWADDR=08:00:27:DA:52:FB TYPE=Ethernet UUID=... ONBOOT=yes MM_CONTROLLED=no BOOTPROTO=dhcp ifcfg-eth1 file: ...
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20 views

virtual box not connecting to internet on mac after shared folder creation

I have a virtual box(version 5.0.20) vm for centOS. By default Network adapter setting is Attached to NAT Name - Blank (nothing is written) Advance Type Adapter Type-Intel PRO/1000 MT Desktop (...
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34 views

Install a windows VM on my CentOS server [closed]

I have a dedicated server with a centOS installed. I need a windows environment. I just thought if it would be possible to install a Windows virtual machine and use remote desktop to connect to it. I ...
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1answer
29 views

How do I add to sudoers.d from a custom rpm

I have a custom RPM I created that needs to add entries to sudoers so I have entries added a file in my RPM /etc/sudoers.d/mypackage and put my sudo commands in there. The files gets added and the ...
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13 views

Migrating VM from Ubuntu to Centos?

I am using ubuntu on my VMware VM. I attached a Centos boot disk with three partitions with centos and following network setting in etc/sysconfig/network-scripts/ifcfg-eth0. # Configuration for ...
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1answer
15 views

Ports required for NFS share to be used by RHEL / CentOS

I have a WS2K12 R2 server that is serving a NFS accessed by CentOS 7 / RHEL 7 if I turn my Firewall off it works with it on it doesn't. Question Is: What are the ports required for the NFS Share (TCP ...
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32 views

Centos 7 diskless client cannot mount NFS

I've spent the last few days learning how to set up a diskless client in a couple virtualbox machines, following the guide in the RHEL documentation. So far I have made it through the whole guide, but ...
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1answer
55 views

Yum error when trying to install remi repo

New installation of CentOS 7.2 with Apache 2.4.6. Trying to install the remi repo so that I can upgrade to PHP 5.6 (yum only provides 5.4). When trying to install the repo from an rpm, I get the ...
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20 views

CentOS7 user not inheriting group permissions

I've been following the tutorial at https://www.digitalocean.com/community/tutorials/how-to-install-wordpress-on-centos-7 (along with all the prereq tutorials) to setup wordpress on my new CentOS7 ...
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16 views

XenServer no internet for VMs w/ DHCP

I recently built home server with the intention of learning more about Linux/Virtualization. I installed XenServer and chose DHCP during the installation, where the XenServer Host (Dom0) has full ...
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1answer
31 views

Script not working in crontab

I have a script to start my minecraft server each reboot. I can see in the logs it's calling the cmd, but no screen is being opened. If I work run the script manually /home/minecraft/scripts/...
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2answers
87 views

CentOS 7 - Won't accept any SSL certificates

I have a problem on my CentOS 7 box doing anything that requires SSL, including curl, wget or updating via YUM. The output is always the same: [root@localhost ~]# curl -I -v https://google.com * ...
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28 views

KDE on CentOS steals Alt-Shift from applications?

I'm using KDE on CentOS 7 on one machine and KDE on Kubuntu 16.04 on another. In both cases I've set Alt-Shift to switch keyboard layout. However, in Kubuntu Alt-Shift-XXX is still free: I can make ...
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31 views

Centos6 missing GLIBC_2.15

I am trying to start a Rust server but getting this error: /home/tcagame/admin/8/RustDedicated: /lib64/libm.so.6: version 'GLIBC_2.15' not found (required by /home/tcagame/admin/8/RustDedicated) /...
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61 views

Why does vim-common conflict with vim-minimal on fedora23 and centos?

I generally need both vim-common and vim-minimal to have a usable system. I need vim-minimal because package sudo unconditionally depends on it (and I need sudo). vim-common in turn is a dependency of ...
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49 views

KVM Network Configuration

I was wondering how I could achieve making a KVM host with CentOS 7 (64-bit latest) with the following network goals... I'm trying to put the virtual machines on a VLAN of 10.0.0.0/24, and have that ...
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1answer
32 views

Centos: there is no ~/.cache/upstart

I'm new with linux.As I know ~/.cache/upstart is folder where system processes log their stuff. But I can't find this folder in Centos. What I'm most curious about is that on Ubuntu this folder ...
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1answer
109 views

Error: Could not find or load main class with OpenJDK and Oracle Java on CentOS 7

On CentOS 7.2 Linux I have successfully downloaded and installed Oracle Java with: # rpm -Uvh jdk-8u91-linux-x64.rpm Also there is already OpenJDK installed: # rpm -qa | grep -i jdk java-1.8.0-...
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64 views

Install ruby without root access on CentOS

I'm on a clean CentOS install without sudo-rights. I had installed ruby-build locally and then tried to install Ruby 2.3.1 with ruby-build 2.3.1 ~/.local/opt/ruby-2.3.1. I got this error The Ruby ...
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1answer
36 views

Yum conflict error after Tuleap install on Centos

I did a basic full install of Tuleap on Centos 6.7 about a month ago. I'm now getting an error tuleap-plugin-git-gitolite3-4.153-1.el6.noarch has installed conflicts tuleap-plugin-git: tuleap-plugin-...
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27 views

NRPE CentOS 7 Could not open config directory

I just installed NRPE on CentOS 7 via Chef. This is the same recipe that I use for all of my CentOS 6 servers - and works there. NRPE starts up but errors out here: Jun 13 15:12:21 myserver nrpe[3667]...
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21 views

Linux: Looking for a network log for server connections

Is there a log in centos servers that records every connection to/from? so something like a centralized connections log
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24 views

Redirecting wildcard domain to local ip address

I try to have my local workstation redirect a complete wildcard subdomain to a specific ip address. I run VirtualBox on my CentOS 7.2-1511 which provides a VM on 192.168.11.11 (for those interested: ...
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1answer
21 views

Shutdown command not working within script

I have a script that's supposed to stop my minecraft server, and then restart the server. The problem is, whatever command I use to restart it doesn't work. I know the script is processing, because it ...
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1answer
18 views

where is Zimbra accounts information location?

Where does Zimbra 8 (installed in Centos 6.4) stores accounts information e.g. email address, password, name ... I want to find its physical address. I couldn't find these information in the database ...
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1answer
67 views

Gmail as postfix SMTP relay in CentOS 7

Followed these instructions: http://charlesauer.net/tutorials/centos/postfix-as-gmail-relay-centos.php And still having trouble. Everytime I send a test message, /var/log/maillog still returns: ...
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1answer
32 views

How to ping a vm on a machine from a vm on another machine?

I have 2 centos 7 VMs on my laptop. They can ping each other and the host. However, I am unable to ping a VM on another laptop.