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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Apache leading to system lock/freeze

The conclusion in the title may be wrong given that the problem is close to a year old and just now was I able to get some info on the issue. This is on a centos 5, running on an old PIII with 384 MB ...
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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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1answer
10 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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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
66 views

What are the steps to enable Apple monitor on Centos 7

I have Centos7 installed on a Dell XPS L502X which has a thunderbolt compatible? (Mini DisplayPort) port. I've plugged in my Apple Mac monitor but predictably enough Centos detects it as an unknown ...
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0answers
11 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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1answer
19 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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2answers
40k views

How can I determine the MAC address for a NIC in CentOS without using ifconfig?

CentOS 5.5 One of my CenTOS systems recently booted with the following error: "Bringing up interface eth0: Device eth0 has difference MAC address than expected. ignoring." When I run ifconfig -a ...
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1answer
3k views

Unable to install MariaDB on Centos 6.5 server - “No package available” in yum although Repo is present?

I've hit upon a strange issue with a new installation of CentOS 6.5 while trying to install MariaDB. I've included the following information and created a MariaDB.repo file inside the /etc/yum.repos....
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0answers
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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3answers
44 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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0answers
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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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1answer
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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1answer
3k views

How to setup PPPOE connection in CentOS

I want to configure PPPOE connection in the CentOS. I have selected the network type as DSL and interface eth0. But it is still not working. Please, any one tell me the solution to this.
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vote
1answer
7k 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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4answers
13k views

CentOS 7 ESXi/VMware Hang on Boot

I installed CentoOS 7.0 1406 on a VMWare ESXi 5.5 hypervisor. I installed "Sever with GUI" and selected KDE. However on boot I get the following messages in under a second, before the process tops (...
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1answer
697 views

set up (VirtualBox + CentOS) with (nginx + PHP + MySql) on MacOS

I'm trying to set up (Virtual Box + CentOS) with (nginx + PHP + MySql) on MacOS, the future I can coding on MacOS then throw file to the share folder with (Virtual Box + CentOS) and execute on (...
2
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1answer
95 views
+100

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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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). ...
0
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1answer
361 views

Samba fails to connect to VMWare CentOS guest from Mac Mavericks host

Trying to connect through smb to my VMWare guest at 192.168.0.138:139 gives me the following message: There was a problem connecting to the server "192.168.0.138" This file server will not ...
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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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1answer
17 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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1answer
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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0answers
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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3answers
3k views

Is sendmail a smtp server? Is there any difference between MTA and mail server?

I am new to mail and do not exactly know how it works. I have seen administrators use sendmail to send out email. Is sendmail a smtp server or is it a client that need to relies on smtp server to ...
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0answers
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
32 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
48 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
16 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
6k views

Is this a network problem or a server crash? How do you identify what the real problem is when you can't ping?

Today I was unable to ping my server remotely (CentOS 5.4, on a Dell). Then I tried traceroute and it showed destination host unreachable. This is very confusing because it should not do this. When ...
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2answers
308 views

Conflicts between attempted installs while installing gstreamer plugin on Centos

I am trying to install gstreamer-ffmpeg package for opencv c++ coding purpose on Centos-6.7 When I type; sudo yum install gstreamer-ffmpeg* it gives error: Transaction Check Error: file /usr/...
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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 ...
0
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1answer
33 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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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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2answers
6k 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 "...
0
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1answer
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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0answers
27 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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0answers
9 views

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]...
17
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3answers
119k views

SSH Permission denied on Correct Password Authentication

I could successfully SSH into my machine yesterday with the exact same credentials I am using today. The machine is running Centos 6.3. But now for some reason it is giving me permission denied. Here ...
2
votes
4answers
6k views

CentOS installing jre/jdk error

[root@jony source]# sh run.sh Error occurred during initialization of VM Could not reserve enough space for object heap Error: Could not create the Java Virtual Machine. Error: A fatal exception has ...
0
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1answer
358 views

xenserver 6.5/centos 5.10 parted/glibc upgrade missing dependency that is not missing

I cannot seem to find the official best way to get round this issue: $ yum --enablerepo=base --disablerepo=citrix install parted Loaded plugins: fastestmirror Loading mirror speeds from cached ...
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4answers
14k views

Check if a DHCP server existing in my network using bash

using CentOS with static IP, Is there any way to determinate if a DHCP server running on the network using bash ?
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1answer
2k views

File command Linux parent package name

I cant find out what the parent package of the file command is. Need it installed on a Centos 6 OS. Regards
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0answers
16 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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1answer
618 views

Installing CentOS on VMware vCenter VM from remote console

I have a VM on my school's VMware vSphere server and I need to install CentOS on it, the disc is already in it but I can't install it 'cause the console doesn't work without VMware Tools (I can't ...
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2answers
79 views

Can access VM Guest IP from Host but not from other computer on same LAN

I am hosting a web application on a Linux (CentOS 6.7) Virtual Machine guest, that is sitting on a Windows 7 host. I have configured a bridged network connection between the host and the guest, and ...
0
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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 ...
2
votes
1answer
789 views

Hyper-V Virtual Machine Suspending on Host Shutdown (Integration Services Installed)

I'm trying to get a VM time synced with a 64-Bit Windows 8 host upon host shutdown and startup. Linux Integration Services is installed on the virtual machine and all integration services are enabled ...
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1answer
3k views

Google Chrome on a fresh CentOS 7.1 not starting up

I am having a bad time trying to run Chrome on my CentOS 7.1 server. I know, it does not have a screen, it's a server. But I installed GNOME anyway and using VNC I can see the screen on a remote ...
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4answers
2k views

Apache 2.4 vhost not working

We have a new Centos server installed with Apache 2.4.9. I'm trying to get the vhost working. DNS resolves to the right machine, and I can see the default Apache page, so it's not a firewall issue and ...