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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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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11 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 /etc/...
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81 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
282 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
17 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
139 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 9....
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2answers
88 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
85 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 devtoolset-3-gcc-c++-4.9.1-...
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25 views

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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2answers
500 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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36 views

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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25 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
22 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 ...
2
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1answer
93 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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2answers
85 views

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 ...
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2answers
89 views

Grub not listing the new kernel while booting

I recently updated my kernel on CentOS 6.7. That also cleaned up all the older versions, which also updated my /boot/grub/grub.conf, it has a single entry (of the new kernel). Now, when I rebooted, ...
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1answer
37 views

centos - cannot create two symlinks to /var/www/html

I have two users chrooted to their home directories, that need access to /var/www/html. I tried to solve this by creating a files directory within their directories and in that files directory create ...
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1answer
79 views

Adding --no-check-certificate to yum repositories

I have added virtio-win.repo according to this guide. The content of /etc/yum.repo.d/virtio-win.repo is now [virtio-win-stable] name=virtio-win builds roughly matching what was shipped in latest ...
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7 views

Postfix and Dovecot Issue

I am a dovecot user. I have assigned 1000 MB space to one of my clients. Now, if mail is sent to his email, an over quota message bounces back. I checked from the server, it is only showing 300M used. ...
4
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1answer
165 views

Apache can't access /var/www/html

Apache is denying access to all the files in /var/www/html. It claims it's because of file permissions, but the whole /var/www directory is chmod 755 and owned by apache:apache. Apache error log: ...
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42 views

How to install packages in remote server without super user

Here's the thing: I have access to a remote server (ssh) to carry out a project of mine. (It has better specs.) I don't have super user privileges on this system (obviously!). Hence, I can't do any ...
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27 views

My old CentOS 6 computer died. How do I make a new one boot with the old HDDs?

As the title says, I have had a CentOS 6 box for some years, but recently it died. Since it was quite old, I've upgraded it with a whole new box (new psu, motherboard, RAM, CPU), but kept the HDDs. My ...
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1answer
76 views

Download Java 1.7.0 JDK for CentOS

I have a CentOS 5.2 32-bit machine, which I can't connect to the internet. As Java Oracle does not seem to work, I would like to try using OpenJDK, but therefore I need to install OpenJDK first (...
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16 views

Creating a self-contained installation file for pymssql for CentOS

I'm trying to deploy a Python application on a machine that due to system and organisation requirements can't have gcc installed on it, so I need to create a self-contained installation file for ...
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43 views

Has the installation of Google Authenticator chaged for CentOS 7?

ANOTHER UPDATE Did some more research and found this link, which talks about the repo issues I had. I'm going to check it out, and if it works, post a modified version for CentOS7. UPDATE So I just ...
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1answer
104 views

dpkg-reconfigure on CentOS (for openssh_server)

Systems that use the apt packaging system have access to a command called dpkg-reconfigure which, depending on the package, re-runs some setup commands. At least on Ubuntu, it's possible to ...
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2answers
76 views

CentOS 5.2: GLibC version too old (libgio issue), upgrade to which GLibC version

I'm working on a CentOS 5.2 system. The application I'm trying to launch, refuses because a reference to libgio-2.0.so.0 seems not to exist. This seems to be due to the GLibC version, so I had ...
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78 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: $...
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9 views

GNOME TopBar “Applications” & “Places” switched places(

I'm using GNOME 3.14.3/3.14.4 on following system: $ cat /etc/redhat-release CentOS Linux release 7.2.1511 (Core) $ uname -a Linux X 3.10.0-327.10.1.el7.x86_64 #1 SMP Tue Feb 16 17:03:50 UTC 2016 ...
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14 views

What is the replacement for intr option when mounting NFS?

intr / nointr This option is provided for backward compatibility. It is ignored after kernel 2.6.25. says the man nfs(5). I'm facing the problem when NFS client blocks forever when accessing a ...
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68 views

Ping: unknown host google.com on CentOS 7 in Virtual Box

I'm attempting to talk to the outside world (the internets) via CLI. I'm using CentOS 7 on Virtual Box and I can't get anything to work. I've modified just about every file on the system, restarted ...
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49 views

How to enable Network when installing CentOS 7 from USB flash disk?

I downloaded CentOS 7 DVD ISO. Then I use Fedora LiveUSB Creator to create a bootable USB from that ISO. But during the installation with that USB, I cannot fix the Installation Source, though I have ...
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1answer
11 views

Multi-Email Address Forwarding Not Working

I am using POSTFIX on my CentOS server box to do email forwarding. The goal is to be able to create some simple forwarding addresses for the multiple domains on this box to route mail to a single ...
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1answer
50 views

kerberos ticket not renewable

I followed all recommended MIT kerberos configuration settings. I created a principal and when I do kadmin.local getprinc I see the following kadmin.local: getprinc centos@HADOOP.PSM Principal: ...
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32 views

NameVirtualHost address is not supported, proceeding with undefined results

Apache Details Server version: Apache/2.2.15 (Unix) Server built: Aug 28 2015 22:18:57 Varnish varnishd (varnish-3.0.7 revision f544cd8) Copyright (c) 2006 Verdens Gang AS Copyright (c) 2006-2014 ...
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29 views

Hostname won't resolve after setting up new server

I just completed a fresh install of Centos 7 on a PC. It is connected to the campus network, so I am not in control of the DNS server. I gave it a hostname by setting the HOSTNAME value in /etc/...
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1answer
17 views

How to enable ssh key authentication for root users?

I want root user to be able to login via ssh key authentication. How can I get that done? I tried changing the ssh config file and adding PermitRootLogin without-password but that didn't work. I also ...
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2answers
79 views

Centos 6 server is locked, cannot access via putty and cannot ping

I have rented a Centos6 server and running an Apache Tomcat 7 server with an Apache httpd server proxying it. Sometimes my server gets locked and I cannot access it via putty even ping. My question ...
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1answer
26 views

Error when I boot a server from a USB key

I am trying to boot my Linux server using a USB key with CentOS 6.5 installed. It gives me the boot error message remove disks or other media, press any key to restart. What should I do in this ...
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4 views

Previous system statistics from sar are dated a month earlier

I am trying to use sar to look at the statistics from yesterday (March 9th): $ sar -f /var/log/sa/sa09 Linux 2.6.32-431.el6.x86_64 ([hostname]) 02/09/2016 _x86_64_ (12 CPU) I wonder why the ...
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1answer
26 views

Can I set a process name for my tomcats on CentOS ?

I have several tomcats running on my centos. If I try "top", all of them are shown as "java" . Is there anyway, such as changing the catalin.sh, that I can make each of the tomcat has its own name ...
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0answers
10 views

System Monitor Causes Periodic Current Peaks When Open in RHEL/Centos 6

While collecting data for a power consumption analysis, I noticed that simply having the System Monitor open while at idle caused periodic peaks in the current draw of the 12V bus. The current draw ...
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20 views

SSH connection denied … sometimes

Since our company swapped to Active Directory (we were using LDAP before), this is the Russian roulette to log in via SSH to our CentOS server. 50% of the time I manage to log in without problem on ...
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1answer
64 views

Install ruby >= 1.8.7 on CentOS release 5.11

I’m trying to install SASS, so I need GEMS, which requires Ruby 1.8.7 or higher. The Yum installer installs Ruby 1.8.5. Can’t seem to find a tutorial on the interwebs for successfully installing ruby >...
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0answers
14 views

Why do I see “ [(no branch)] ”?

Hi I am new to puppet and doing free modules in a test environment on cents 7 from puppet website. Initially everything was fine but than I see "[(no branch)]" on command line. e.g; [(no branch)]root@...
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1answer
42 views

Mounting OS X Server share on CentOS server

I'm looking to mount a share from my OS X Server to use as a file dropbox for my CentOS 6 server. Would it be better to use SMB, AFP, or some other protocol to go about doing this reliably?
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1answer
34 views

Centos network manager how to automatically start enp6s0

for some reason i always need to manually activate my network connection on my centos machine after every reboot. I have to type in the nmtui command and activate enp6s0, is there a way to do this ...
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1answer
90 views

How to map all centos shutdown commands to reboot command

i'm running a centos server and I would like to make it so, that when you type the shut down command(s) it would instead reboot the server.
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1answer
147 views

Slow Boot: “A start job is running for /boot”

I'm running a CentOS 7.2 VM on ESXi 6.0, using thick provisioning, no CPU hot add and one virtual SCSI drive/controller. It runs fine, except that booting seems abnormally slow. I checked the boot ...
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28 views

CentOS Host serving Ubuntu VM

Need some help bridging CentOS NIC(physical) to a Ubuntu VM via Virtual-Box's bridging option. CentOS 7 is running on UCS behind proxy(http/https) environment. Trying to bridge through that interface ...