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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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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6 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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4answers
3k views

CentOS- Can't SSH

I recently tried to SSH into my server (an internet linking ham radio node) I just got back on air. I typed ssh root@10.0.1.9 which is my computers address confirmed by ifconfig eth0 Connection ...
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10 views

USB Mouse freezing periodically on CentOS 7

I got a new mouse today (Zowie EC2-A) and every 10 seconds or so the cursor will stop responding and any process running seems to freeze as well. This only happens while using the mouse; when I use a ...
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9 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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34 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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2answers
39 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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1answer
15 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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10 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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6 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
27 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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3answers
7k views

Cant get squid proxy to work

i need squid proxy on my centos server. But i just can't get it to work. I did yum install squid. Here is my squid.conf file (i removed all comments): acl all src 0.0.0.0/0.0.0.0 acl manager proto ...
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0answers
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How to install Compiz-Fusion on CentOS 6 now that it isn't on EPEL?

Now that compiz-fusion has been retired from EPEL, all the tutorials on the internet pointing to it no longer work. How do I install it from the compiz website? I've tried downloading the source code, ...
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0answers
9 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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1answer
46 views

Make directory writable on /var/www/html (Centos 7)

This below question are related to my question on Stack Overflow. I got following error when I went to generate an image on a particular directory: imagejpeg(/var/www/html/assets/files/captcha/...
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1answer
6k views

With Centos 7 as a Virtualbox guest on a Mac Host, how can I change the screen resolution of the console / command line?

I am using the minimum install of CentOS 7 with command line access only (no graphic support installed). After spending hours reading online about editing grub files, installing guest additions, and ...
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3answers
14k views

Install OpenCV in CentOS

I am trying to install OpenCV in CentOS 6. When I run the command [root@cosmas opt]# sudo yum install libtiff4-dev libjpeg-dev libjasper-dev it returned the follow: Loaded plugins: fastestmirror, ...
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29 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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1answer
13 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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0answers
24 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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2answers
5k views

Desktop not starting after Centos upgrade

I upgraded a server from centos 6.5 (with gnome2) to 7 using the update manager. The problem is that I am not able to see the login screen or the desktop. However the mouse pointer is visible. I ...
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3answers
26k views

How do I create a service using chkconfig in CentOS?

I want to be able to create a service so that the bash script will run every time the server boots up. I am running CentOS 5. I have been reading about chkconfig and creating a file in /etc/init.d ...
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1answer
28 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
44 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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2answers
12k views

Version `GLIBCXX_3.4.15' not found in CentOS (in file /usr/lib/libstdc++.so.6)

I try to use a program and I get the following error. /usr/lib64/libstdc++.so.6: version `GLIBCXX_3.4.15' not found Under /usr/lib64 the libstdc++ I see is libstdc++.so.6.0.13 (and a soft link). ...
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0answers
10 views

Merge all partition in CentOS

I've got a copy of CentOS VM from my company. However, the project folders under /home getting bigger and eventually the OS complain about lack of space for the /home partition. That is due to the ...
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0answers
34 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
26 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-...
4
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1answer
32 views

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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1answer
15 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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1answer
42 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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2answers
3k views

VirtualBox: ifconfig does not show my ip address

I recently installed centos7 onto virtualbox. I enabled bridged networking on adapter 1 (enp0s3) on the virtualbox manager, to bridge my wireless adapter on the host. When I type ifconfig on the ...
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1answer
15 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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3answers
2k views

To use ssh-id-copy do you need both id_rsa.pub and id_rsa?

I am trying to setup a second access ssh key for a friend. He sent me his id_rsa.pub. ssh-copy-id -i id_rsa.pub root@123.123.123.123 /usr/local/bin/ssh-copy-id: ERROR: failed to open ID file './...
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0answers
14 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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vote
1answer
16 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 ...
2
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1answer
28 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.
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2answers
5k views

vmware player won't run on CentOS due to missing /dev/vmmon, what could be the problem?

So I've tried installing vmware player 3.1.4 and 3.1.3 and both times had the same problem, when I try to load a VM I get the error "Could not open /dev/vmmon". When I ls /dev/ I can see there is no "...
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2answers
9k views

Unable to use yum on CentOS 7

I have install CentOS 7 on hyper-v successfully, but when I try to update using yum update or try to install using the yum command I have the below error: Loaded plugins: fastestmirror, langpacks ...
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0answers
9 views

Centos 7 java version upgrading issues

am planning to upgrade a server's java version but as i was scanning through mountains of articles i cannot find any article regarding points to take note when upgrading the java version. Currently, ...
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0answers
71 views

Vagrant can't rsync Windows

I have a problem with Vagrant. I'm using a CentOS vm. The vagrant up command sucessfully maps files from Windows to the CentOS vm, and gives no errors when bringing the machine up. EDIT: $...
2
votes
1answer
35 views

Pacemaker Resource always stopped

I'm setting pacemaker for heartbeat seeing the doc https://skcave.wordpress.com/2014/11/04/creating-high-availability-cluster-with-centos-7/ When I set the pacemaker as above, there is no problem. ...
2
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1answer
22 views

Where can I find the DHCP client logs in centos

I am running a PC with centos Linux. I have two ethernet ports. One configured as DHCP server and the other to use DHCP to obtain IP address(client). I am interested in getting the history of lease ...
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1answer
55 views

Missing /var/log/messages file in CentOS 6.8

I'm not sure what I'm doing wrong, but my Linux box doesn't seem to be logging any info to the messages file. Will someone please help? Here's the content of the /etc/rsyslog.conf file # rsyslog v5 ...
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0answers
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UnknownHostException in hadoop on CentOS

I received this error when I tried to run the dfsadmin command: bash-4.2# bin/hdfs dfsadmin -report report: java.net.UnknownHostException: locahost Usage: hdfs dfsadmin [-report] [-live] [-dead] [-...
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vote
1answer
3k views

symlink and sudo executable

If I have the below sudoers entry usera ALL=(userb) NOPASSWD: /home/userc/bin/executable-file usera ALL=(userb) NOPASSWD: /home/userc/bin/link-to-another-executable-file When I log-on as usera and ...
1
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1answer
146 views

WHM warning about invalid permissions on /etc/shadow, “Expected: 3377602730, Actual: 0644”

I've been getting some alert messages sent by my WHM instance, warning about invalid permissions on my shadow file. However, the actual permissions (0400) seem correct, and the permissions it reports ...
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2answers
10k views

centos 7: control idle (screen blanking) time?

OS: CENTOS 7 / Gnome 3 GUI How do I the time that must elapse until the OS thinks that the computer is idle and blanks out the screen? I am aware of the new Settings | Privacy | Screen Lock feature, ...
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0answers
1k 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 ...