CentOS is an Enterprise-class Linux Distribution derived from Redhat Enterprise Linux sources freely provided to the public.

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CentOS limits.conf & cpulimit not working

I have a CentOS server I am testing things out on. In it, I have configured USERNAME hard maxlogins 4 USERNAME hard cpu 1 USERNAME hard nproc 10 in ...
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36 views

Rebooting Centos Servers configured with MYSQL Master/Slave Replication

Sometime ago we configured MYSQL replication on our main web server to another CentOS 6 server. All is working perfectly and we can see the replication is working fine. My question is how to safely ...
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53 views

PHP 5.4 ON CENTOS 7 , NGINX , page not found error

I am trying to install PHP 5.4 on CentOS 7 currently , my conf files look like the following : /etc/nginx/conf.d server { listen 80; server_name 178.62.255.79; root ...
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23 views

Centos 6-7 install argument for GUID Partition Table

From here http://www.tecmint.com/centos-7-installation/ item 11 NOTE:For those users, who have hard-disks more than 2TB in size, the installer automatically will convert partition table to GPT, ...
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33 views

iptables not getting saved ? centos

I am trying to save the iptables, when I run command #service iptables save it says [ok] but when I again open the iptables the rules get revert to default. Can anyone help me to understand this ...
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112 views

mount exFAT HDD on CentOS 7

I'm running CentOS 7 on my server. I can't yum install fuse-exfat exfat-utils so I installed exfat-utils 1.0.1-1.el7.nux and fuse-exfat 1.0.1-1.el7.nux via RPM. I have a WD Green hard disk, which is ...
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2answers
3k views

Installing python modules for python2.6

On my CentOS 5.8 system (el5 , 64bit), I had python2.4 after OS install and I installed python2.6 now. Now I want to install python modules using yum. But whenever I install a new python module it ...
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2answers
56 views

Yum Broke For some reason

i am trying to install Mysql Client i am getting this annoying message. I am still unable to find the proper answer. [root@localhost Downloads]# yum install mysql-bench There was a problem importing ...
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35 views

How to fix: /usr/lib64/libstdc++.so.6: version `GLIBCXX_3.4.15' not found

I need to install doctotext hence in the base directory, I run doctotext.sh and I got the following error (./doctotext: /usr/lib64/libstdc++.so.6: version 'GLIBCXX_3.4.15' not found). When I did ...
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1answer
70 views

Centos inside Virtualbox — how to set custom resolution?

I have Centos inside Virtualbox. I need custom resolution for my screen. I run xrandr as proposed on the net. New resolution appears in the dropdown. But it doesn't work. Virtualbox addons are ...
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1answer
4k views

How to update glibc to 2.14 in CentOS 6.5

I want to install Android NDK on my CentOS 6.5 machine. But when I ran the program, it says it needs glibc 2.14 to be able to run. My CentOS 6.5 only has Glibc 2.12 installed. So I tried to update ...
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2answers
28 views

many missing dependencies , no links (centOS 7 , postgresql 9.3)

I am trying to install postgresql 9.3 on centOS 7 first , I needed to install libxml2 , and then I tried to install libxml2-devel /$ rpm -iUvh ...
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1answer
50 views

httpd 2.4.6 on CentOS 7 - question related to module config in httpd.conf

I am sorry to post this type of question here but due to the great experience and skillsets here, I hope for your understanding. I am using (unfortunately) httpd package (v 2.4.6). In various guides, ...
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1answer
30 views

Kickstart file - installer is ignoring some of the “do not install” packages from the packages section

When I use the kickstat file on CentOS 7.0, the installer seems to be ignoring some of the "do not install" packages in the list. cdrom text auth --enableshadow --passalgo=sha512 keyboard ...
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0answers
42 views

How to install rpm

I have CentOS-6 and rpm and yum installed on it. The problem is that I had make utility on my system, but somehow it got uninstalled. Now, i want to install make with 'yum install', then I get ...
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2answers
68 views

Clone Python from one linux machine to another

I want to run some of my python scripts on my new Linux (Centos 6.5) machine that I developed on another Linux machine (also Centos 6.5). But my problem is that my new machine is not having internet ...
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24 views

Cannot mount LVM partition after restoring LVM metadata

I have resized two LVM partition (/var and /home) and somehow resize process went wrong. After reboot system wasn't able to mount /var and /home. I have used RIPLinux to check if I can mount those ...
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1answer
98 views

httpd 2.4.10 in CentOS 7

How can I update my httpd version 2.4.6 to 2.4.10? If I try to update it with yum, it says that I have the latest version. I want to update httpd to 2.4.10 version because a security issue of the ...
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0answers
17 views

Moving Informatica data(directories) from one unix server to another unix server

Can we migrate directories from one unix server to another unix server, without the need of installation of Informatica softwares on the new unix server? If yes, then will there be any change in the ...
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1answer
62 views

Installed PHP extensions to wrong PHP version

I just bought a VPS and it came with PHP5.3.3 and that wasn't good for our website, so I successfully (so it seemed, anyway) installed PHP5.6.7 and successfully registered it with Plesk. For the ...
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3answers
796 views

installing eric5 in CentOS 6.4

I am trying to install Eric Python IDE 5 in my CentOS 6.4. The problem here is even I have installed PyQT4 its again saying that module is missing. what I am supposed to do ? here is the terminal log ...
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2answers
535 views

install opencv-2.4-9 on centos 6.5 with cuda 5.5 support

I can't seem to install opencv 2.4.9 on centos 6.5 with cuda 5.5 support. This is my cmake output: [root@cadejos-0 opencv]# cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/opt/opencv -D ...
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11 views

Issue with setting up StrongSwan VPN [duplicate]

I'm trying to set up a strongswan VPN. During the setup I get this error $ sudo strongswan pki --gen --type rsa --size 4096 --outform der > ipsec.d/private/strongswanKey.der -bash: ...
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1answer
10k views

Nslookup: command not found error on RHEL/CentOS 7

During linux installation I selected "minimal" option: When I went to run the nslookup command to look up an IP address I got the error message nslookup: command not found as shown in the example ...
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10answers
69k views

Is CentOS exactly the same as RHEL?

I'm sure this question has been asked again and again elsewhere (I did not find anything specific to CentOS vs RHEL in SE), but I would still like to ask and confirm a few specific points. I am well ...
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1answer
40 views

CentOS 6 Static IP Address

I've just assigned my CentOS machine with a static IP address using the /etc/sysconfig/network-scripts/ifcfg-eth0 which has the following lines and seems to be working #eth0 config DEVICE="eth0" ...
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1answer
454 views

gpg-agent fail: undefined symbol gpg_err_set_errno

We started to get some odd issues yesterday; possible due to a yum install gone bad? One of the issues, PS -ef hanging indefinately (actually an ps command that looks at other user state) was fixed ...
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1answer
81 views

Centos 7 - Trying to install postgresql (from postgresql.org)

I am trying to install Socorro service on fresh Centos 7 (installed on Amazon ec2). I am following the instructions from the official documentation - Socorro. I installed the PostgreSQL 9.3 RPM ...
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1answer
26 views

VPS: How to forward traffic to devices from public IP

My goal is to set up a public IP for a Android Smartphone which is running an "IP Cam" software - the interface can be accessed in local network on (example) 192.168.0.2:8080 - But it has no public IP ...
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68 views

CentOS 7 /var/log/messages

We have a CentOS 7 (3.10.0-229.1.2.el7.x86_64) server running as our main file share server. We randomly see the following error messages showing up in our /var/log/messages and have been trying to ...
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24 views

How do I show that a Desktop environment is NOT installed?

I need to document that a server is running a minimal installation of CentOS. I'm aware that I can echo $DESKTOP_SESSION (returns blank), but is there a better way of showing that the OS is minimal ...
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22 views

CSF not blocking port when removed from csf.conf

I have removed VNC port 5901 from the csf.conf configuration file and executed a csf -f a csf -x and a csf -e to flush and restart CSF. There is a vncserver running on port 5901 and when doing an ...
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2answers
216 views

GNOME license not accepted issue when system has been rebooted

GNOME Desktop has been installed on CentOS7 using sudo yum -y groups install "GNOME Desktop" and when startx is executed the desktop starts. However, when the system reboots the following issue ...
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1answer
23 views

Nginx File 404 when trying to launch drupal install.php

I am getting a 404 when trying to access the install.php for drupal on nginx. Below are my /etc/nginx/nginx.conf and /etc/nginx/conf.d/default.conf files. the nginx user and group own the ...
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1answer
26 views

mount times out with iptables --policy OUTPUT DROP

I previously ACCEPTed all output traffic by default. Recently changed the policy to DENY output by default, only opening ports needed for server/application functionality. When I tried to mount a ...
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1answer
632 views

can't connect to samba drive in centos 6.3

#smbclient //ballzdeep/torrents Server not using user level security and no password supplied tree connect failed: NT_STATUS_BAD_NETWORK_NAME Does this mean i need to require username and password ...
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2answers
738 views

vgdisplay shows 0 free PE/size

I'm trying to configure a CentOS HA system with 2 nodes, with DRBD for replicated storage. I'm following the "Clusters from Scratch" guide, and at the DRBD portion, I need to create a partition for ...
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1answer
54 views

How to create permanent ip alias belonging to different subnets in Centos

I followed this link and created few alias ips on my centos 6.5 machine but all these ips belong to same subnet. What I have: My machine: eth0, 10.91.56.3 IP Alias1:eth0:1, 10.91.56.4 IP ...
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1answer
856 views

Unable to view traps through snmptrad?

I've been unable to view traps through snmptrapd. I generated a SNMP trap manually using the below provided snmptrap command: snmptrap -c public -v 2c -n "" localhost 0 uptime But I'm ...
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87 views

PgBouncer is running, but cannot connect

PgBouncer started using pgbouncer -d -v pgbouncer.ini. pgbouncer.log file: Actually, every line in this file begins with a date/time stamp of 2015-01-19 11:37:46.415 (first 7 lines) or 2015-01-19 ...
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1answer
59 views

What variables are valid within /etc/default/useradd file?

My /etc/default/useradd file is as follow: # useradd defaults file GROUP=100 HOME=/home INACTIVE=-1 EXPIRE= SHELL=/bin/bash SKEL=/etc/skel CREATE_MAIL_SPOOL=yes man page for useradd provides many ...
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5answers
6k views

Limiting processes to not exceed more than 10% of CPU usage

I operate a Linux system which has a lot of users but sometimes an abuse occurs; where a user might run a single process that uses up more than 80% of the CPU/Memory. So is there a way to prevent ...
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41 views

Dovecot ACL config for read-only user mail folders (CentOS 6)

I'm using Dovecot as an IMAP server. It's the latest version from source installed to /opt. Dovecot -n output: # 2.2.16: /opt/dovecot/etc/dovecot/dovecot.conf # OS: Linux 2.6.32-504.12.2.el6.x86_64 ...
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15 views

Rsyslog logs retransmitted after log rotation

I have config setup on all my CentOS servers to forward all syslog messages to a Graylog server via rsyslog. In Graylog I have then configured streams to alert on the occurrence of certain message ...
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1answer
85 views

Autoinstallation of Centos7 (PXE) ends up in booting to the live-DVD login

EDIT: 2015-03-29 16:14 UTC+1: After downloading the images, the VM throws the error "Failed to mount RPC Pipe Filesystem" I am trying to do automatic installation of CentOS 7 via PXE. My PXE server ...
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1answer
32 views

Resize MDADM/Software RAID underlying partition and filesystem

I am running out of space on my root partition and would like to steal some from a different partition. The drives are 2x120GB with mdadm software RAID. I am using CentOS 6.5 64-bit. I used the centos ...
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1answer
27 views

What does the “-y” do in “yum -y groupinstall gnome”?

I've been googling and reading tutorials, but while the authors go into detail with all the things you can do with yum, no one ever mentions what the -y flag is for. I'm trying to automate this with ...
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2answers
46 views

Append DNS suffixes to /etc/resolv.conf

Is it possible, and how do I configure CentOS 6.6 so that /etc/resolv.conf will obtain its configuration via DHCP, but will also have additional domain names added to the search line? Bonus points if ...
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1answer
77 views

Policy in /etc/pam.d/password-auth is not being enforced

I've updated login.defs and password-auth to include a minimum length on passwords (12), but the minlen is not being enforced when I attempt to change a user's password with passwd. None of the ...
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4answers
18k views

How to solve “building the main Guest Additions module Failed”

I tried to install the VirtualBox Guest Additions module in a VM guest running CentOS but I get this error message when everything else was okay: building the main Guest Additions module Failed ...