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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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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34 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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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
88 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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30 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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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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75 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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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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45 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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41 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
98 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
162 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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29 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 ...
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112 views

Installing Virtualbox 5.0/Vagrant on CentOS7. Ubuntu box not working

Here is the story: I tried to create an Ubuntu box with Vagrant on CentOS 7. This didnt work because I could not connect to the Box through SSH, the log indicates the box wont accept the IP. Log: 00:...
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10 views

how to run a shell command every boot in CentOS 6.6?

I want to use this command every boot >/etc/udev/rules.d/70-persistent-net.rules so I wrote it in /etc/rc.local but it didn't help , is ">" a problem ? my purpose is to clear /etc/udev/rules....
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1answer
41 views

Linux - create screen as another user

I'm trying to create a new screen on my server (CentOS 5.11), but instead of starting it with my user, I would prefer to use another user with restricted permissions, just to be on the safe side. So, ...
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1answer
18 views

How to use mv command to remove unwanted character from multiple files in the same directory

I have in a directory some files: agent_datad.bin _codecs_cn.cpython-34m.so _Crypto.Cipher._ARC4.so Crypto.Hash._RIPEMD160.so ... other files How can I remove the _ from the beginning of each file ...
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3answers
2k views

centos upgrade openssl - CVE-2016-0800 - drown attack

Because of recent vulnerabilities discovered in old openssl versions I have to upgrade it. But there is no current Version in the Centos Repositories... Is there a trustworthy repository out there ...
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96 views

Are there technical reasons why specific directories can or should be excluded from backup in Linux, and what are those directories?

I am doing a backup of my Linux CentOS 6 using Rsapshot. I already have daily backups that do only critical things like databases and emails. However, I'd like to set-up a "total" backup where ...
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108 views

Can't telnet to a Linux port

There is the following listener: telnet -na | grep 8000 tcp 0 0.0.0.0:8000 0.0.0.0:* LISTEN I can do telnet 1.2.3.4 8000 from the 1.2.3.4 server and it connects, but same command from ...
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183 views

I'm getting “Bad argument setup” while running VirtualBox on Linux

I'm trying to run Oracle VM VirtualBox, and I'm getting following error: # /sbin/rcvboxdrv setup Bad argument setup # cat /etc/redhat-release CentOS Linux release 7.2.1511 (Core) # uname -a Linux X ...
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50 views

How to make Postfix to bcc of incoming mail when the mail is delivered to an alias

When you configure recipient_bcc_maps straightforward, it works fine. But when an email is delivered to an alias that is defined in virtual_alias_maps, which can be either a name alias or a domain ...
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1answer
24 views

Is mixing software RAID disks across SATA and eSATA going to have any issues?

I have two eSATA drives running successfully in a software RAID on CentOS. I would like to make this a three disk mirror RAID by adding the third drive from the internal SATA drive. Are there any ...
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72 views

How do I include files (like post-scripts) for kickstart to a CentOS 7 bootable installation USB in Windows?

I'm trying to create a installation USB for CentOS 7 automated with kickstart. The kickstart files including packages & post-scripts is around 500MB and I'd like to include those in the USB. I'm ...
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1answer
150 views

lighttpd can't bind to port: Permission denied

$ sudo service lighttpd start Starting lighttpd: 2016-02-29 09:51:24: (network.c.410) can't bind to port: 88 Permission denied [FAILED] ...
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57 views

Edit/Remove Places + Submenus from Top Panel Gnome

How do I remove "Connect to server" from "Places" Menu in gnome top Panel for all users or remove "Places" Menu itself for all users ? Remove/Hide Connect to server " I want to restrict users from ...
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15 views

my git details & connecting via eclipse

I installed git on a CentOS machine. I initiated the git on the server on /var/git/.git/. My question is: how do I connect to the git via eclipse and adding files, and what should be my connection ...
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15 views

No 'Makefile' created KAMENSKY/Text-Bidi-2.11.tar.gz

I am trying to install following perl module via cpan on centos 6.x but unfortunately getting error. Please advise to solve. Text::Bidi Version: 0.03 Usage: Label batch PDF CPAN /usr/bin/cpan ...
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49 views

can i restore/ repair dev, proc & sys? elastix on asterisk (Centos)

well my hard disk started to get bad sectors and began to fail.. so i had to take a image, tried the clonezilla. every thing was alight till i restarted y machine and then kernal panic! & the ...
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1answer
80 views

How to manage my firewall with new Centos's utilities?

I just installed a Centos7 distribution on my server. I came from Centos6, and I read that iptables utility has been replaced by firewalld and services utility by systemctl. So I try to get my ...
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1answer
435 views

Unable to connect to mongodb running in virtualbox (host: Mac OS, guest: CentOS)

I am using CentOS 7 in a virtualmachine running on Mac OS X using Virtualbox. Unfortunately I am not able to connect to the VM's database from my Mac OS host. I am using NAT as network for the VM and ...
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1answer
121 views

how to resolve libx265 dependency issue on CentOS7?

I'm trying to run a # yum update On my system and I'm getting the following message: --> Finished Dependency Resolution Error: Package: ffmpeg-libs-2.6.5-1.el7.nux.x86_64 (@nux-dextop) ...
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32 views

How to configure Kile to work with secondary texlive install in Centos 7?

I've done a clean installation of Centos 7. It is critical that old my latex projects should compile and I want to use Kile (KDE's latex text editor and environment). However the first thing I found ...
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1answer
51 views

unable to boot into centos 6.7 after suspending the system

I suspended the cent os workstation when I restart it is unable to load the OS and I am always displayed with boot option menu like upgrade or install memory test etc result of pvscan : could not ...
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10 views

Apache config related issue

I'm trying to harden my apache installation, and so deny access from apache to my root directory, but i'm kind of confused, because in the config it already says, that it's denying access to the root ...
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68 views

How to find bottleneck in mysqlcluster and apache/php server?

I have setup a mysql cluster 7.3.x with 2 Datanodes,2 SQL nodes and 1 Management Node in a LXD/LXC centos 6.7 containers and a separate Apache 2.2.x/PHP-5.5 web server. The website currently serves a ...
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2answers
136 views

PhantomJS No Such File or Directory on CentOS

I am trying to run PhantomJS on CentOS. I have used this page as a primer for installing it. HOWEVER, when I go to run the version command, I get command not found. I have verified that the file ...
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10 views

Packet is getting dropped even though iptables rule allows forwarding

I configured the following on CentOS to enable IP forwarding but limit to specific IP range(destination): iptables -D FORWARD -i eth0 -j ACCEPT #delete default ACCEPT rule iptables -P FORWARD ...
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21 views

Centos vmware loses network on resume—how to re

I am using the Cloudera Quickstart VM 5.5, which is based on Centos 6.4. I have it running on VMWare Fusion version 8.1.0 (current version) on a Mac running MacOS 10.11.3. The VM is configured to use ...
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1answer
18 views

Static IP using Bash vs Router Interface

What is the "proper" way to assign my CentOS 7 Virtual Machine a static IP? I assigned my Host system (Windows 8) a static IP through the router's administration interface, but every tutorial online ...
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26 views

Cannot figure out what eats disk space, CentOS6

Here is disk free info: root@nqpc002/]# df -ha Filesystem Size Used Avail Use% Mounted on /dev/sda2 103G 85G 13G 87% / proc 0 0 0 - /proc sysfs ...
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50 views

Ping between two Linux systems via an intermediate Linux fails

I have a simple network with three Linux systems running CentOS 2.6. Linux 1 (eth1: 192.138.14.1/24) | | (eth4: 192.138.14.4/24) Linux 2 (eth2: 192.138.4.3/24) ...
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1answer
621 views

CentOS 7 Linux resize filesystem after partition resize

I am running CentOS 7 on a HyperV virtual server. I recently increased the size of the hard disk from 32GB to 64GB and used GParted Live to extend the partition, which seems to have worked as shown ...
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212 views

OCI8 extension not loading in PHP 5.4, CentOS 7

I have a CentOS environment running as a VM guest. It runs and Oracle 12.1 Database, along with PHP 5.4.16, on Apache 2.0. I've gone through the installation steps to ensure that the correct OCI ...
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147 views

How do I enable hyperthreading on CentOS 6?

How do I enable hyperthreading on CentOS 6? I checked the flags field in /proc/cpuinfo and ht is in the flags section. Below is my processor information. ~$ lscpu Architecture: x86_64 ...
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1answer
128 views

How can I prevent that an user sends mail like another user on Postfix?

I am running a Mail Server on CentOS 7. All programs and system are up to date. My Mail Transfer Agent is Postfix, and it uses Dovecot SASL to authenticate the users. In Postfix's configuration, my ...
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Centos freezes, when trying to open crontab

I'm trying to open crontab, but when i type it the whole os just freezes... I thought, maybe that's because vim isn't installed, but it is. I also checked the cron.allow and cron.deny files, but they ...