CentOS is a Linux distribution standing for "Community ENTerprise Operating System" and is a rebuild of "Red Hat Enterprise Linux" (RHEL). The "CentOS6" tag refers to versions 6.x of CentOS.

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Server Unresponsive with Spike in Multicast Packets Received

I got a server from UbiquityServers about a week ago, I installed a simple Apache server and it just serves up images. The server is under very little load because it simply is an origin server behind ...
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127 views

SE Linux - can't change SELinux booleans with sudo

I think this is the correct place to put this, rather than in StackOverflow Either way, we have a CentOS 6.6 server. SElinux isn't allowing us to enable httpd_can_sendmail I've tried this.... sudo ...
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Failing to mount root from ramdisk while PXE boot

I have a working TFTP/DHCP PXE boot environment where I've already booted some images successful. Now I built an CentOS 6.5 diskless image and this one is failing booting with the following error: No ...
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449 views

IPSec + L2TP + NAT-Traversal does not work for multiple clients behind same nat

I have recently configured a VPN server hosted in AWS EC2. Details: Centos 6.4, openswan, xl2tpd, NAT-traversal. The configuration works great for a scenario when only one user connects form a given ...
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1answer
2k views

Where is the “Server Settings” Menu?

Salvete! I just installed CentOS 6 on a new box, and am looking for the "Server Settings" menu in order to configure SAMBA. I have a menu for System, and therein lie "Preferences" and ...
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711 views

Is It a Bad Idea to Install the OS GUI on a Server That Will Host Asterisk?

We have a server onto which we plan to install CentOS 6.2. The server will host Asterisk for our office, but is not a webserver. If we install the minimal installation for CentOS - that is, no GUI ...
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5answers
3k views

How do I automate OS installation on 500+ machines?

My company has to image a large amount of machines by the end of the year. Each of the machines will have hardware RAID 1 and running CentOS 6. What options do I have for automating the OS ...
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4answers
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sysctl -p /etc/sysctl.conf returns error

In a fresh installation of CenotOS 6 in a VPS after running sysctl -p /etc/sysctl.conf I got this errors: error: "net.bridge.bridge-nf-call-ip6tables" is an unknown key error: ...
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3answers
16k views

Changing the maximum mail size in Postfix

When sending large email to a new CentOS6 server running Postfix as the MTA, the following message is returned: tried to deliver your message, but it was rejected by the recipient domain. We ...
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PECL command produces long list of errors

Currently running PHP 5.4 on CentOS 6.5. I installed the webtatic php55w package then installed PEAR+PECL without issue along with redis and mongo through PECL. Shortly after, I realized 5.5 is not ...
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3answers
2k views

Cannot connect to server via SSH

I'm running RHEL 6.0, and I accidentally moved the /bin, /boot, /cgroup, console.txt, /data, /dev, /etc to another folder. I think I managed to move these folders back, but now I'm having trouble ...
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4answers
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Possible NXDOMAIN hijacking?

I have two web servers at our colocation running CentOS 6.0. One runs our main marketing web site (production server) and the other is a staging server for the production server, so almost an exact ...
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2answers
1k views

What mailer does cron use to send mail?

I am trying to debug an issue with cron not sending mail on a Centos 6 box that I did not configure. How can I determine which mailer cron is using to send mail? The crontab man page has this to say, ...
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2answers
3k views

centos 6 epel alternative repository replacement

I've installed EPEL repository already on my server. I wanted to install something new and I get this error with yum : PYCURL ERROR 22 - "The requested URL returned error: 403 Forbidden" Trying ...
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4answers
11k views

Trying to understand the correct way to create a static route in CentOS, please assist

I've been trying to understand what's the correct way to add a static route on a CentOS 6.x machine. In some forums they say to create a file named route-dev_name (for example route-eth0) with the ...
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1answer
9k views

How to recreate samba secrets.tdb file

While trying to setup samba on an NFS server I deleted (don't ask) the /var/lib/samba/ contents and now when I try to start samba, this messages appears : [2012/07/06 08:19:07.528973, 0] ...
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2answers
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On CentOS how do I get boost header files installed?

What CentOS 6 package name do I need to install boost header files: yum install boost doesn't seem to work. Is there a special compiler directive I need to use to point to the include files? Or is ...
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2answers
1k views

How can I enumerate SAS addresses/WWNs in Linux?

I have some SAS devices in a server, I would like to find out what their SAS addresses are. How can I do that in Linux? I'm using CentOS 6.
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2answers
895 views

How long does it take to reboot CentOS 6 server remotely? [closed]

I am renting a dedicated bare metal server running the latest version of CentOS. It's new and I haven't fully configured it. I updated the existing packages and rebooted the machine remotely using # ...
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2answers
82 views

What is the deal with Centos repos? How many?

I am a long time Debian user, now at work have to manage several Centos machines, but I'm used to 1,2 or at most 3 repos on Debian, the centos repo file is full of links, and I dare to say they aren't ...
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2answers
105 views

Dividing sets of services on a single server

A group which I'm part of has grown and is about to move from using DigitalOcean VPSes to a single colocated server. At this point, we don't have a need to distribute our service very highly. This ...
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3answers
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fail2ban iptables having port 22 and fails to block ssh on custom port

This question is almost same problem like mine but accepted answer doesn't solve my issues In Fail2Ban, How to Change the SSH port number? SSH on port 22 everything works great. After 5 attempts ...
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1answer
3k views

CentOS Install - Starting a Kickstart

I have a kickstart file hosted. Let's say it is hosted at http://example.com/ks/ks.cfg I booted the CentOS 6.2 media and hit tab. Before editing anything this shows: vmlinuz initrd=initrd.img I ...
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1answer
7k views

PAM unable to dlopen(/lib64/security/pam_fprintd.so) causing CentOS/Redhat server to crash

CentOS 6, Parallels PLESK 10.4, Apache One of my servers went down over the weekend much to my dismay. On the day and time it occurred, my log errors/messages end with this - /var/log/secure: Jul ...
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1answer
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Centos /etc/hosts doesnt resolve my hostname

[root@data001 etc]# hostname data001.dd [root@data001 etc]# ping data001.dd ping: unknown host data001.dd [root@data001 etc]# How do I fix this? This is on a fresh Centos6 build...does this not come ...
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1answer
3k views

CentOS6 - Apache2 working but when installing / enabling SSL, server won't start because of permissions error

I'm attempting to install Apache with SSL on CentOS6 to use as a development server. I've been following the directions posted here to get SSL working: http://wiki.centos.org/HowTos/Https (Note: ...
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1answer
10k views

centos6 apache2 Invalid Command SSLEngine

Running: CentOS6 x64 When I restart httpd, I get the following error. What am I missing? [root@localhost ~]# service httpd restart Stopping httpd: [ OK ...
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2answers
489 views

How to download the saved images in the Rackspace cloud server?

I wonder if someone know how could I download the saved server image in a Rackspace cloud server. I have been searching and nothing found even in the Rackspace knowledge base. I know it is stored in ...
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1answer
5k views

OpenVPN not redirecting all traffic through VPN

I have just finished setting up my VPN, and google shows my IP to be that of my VPN, so this works fine. However, when I log in through SSH to the VPN server, it shows my last login to be that of my ...
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3answers
193 views

Is it necessary to disable root account on linux servers?

I am planning to deploy some CentOS linux servers and I've read many articles that suggested to disabled root account. I am just wondering is that necessary? If not, what's the best security policy?
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Creating SSH key on Jenkins Master - Centos Yum Install

I have installed Jenkins on a Centos VM as I am looking at replacing Bamboo, I have it all up and running by following the install instructions. That went fine, I then wanted to spin up a Slave, I ...
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Installing lighttpd on CentOS 6.3 yum 404 errors

I have a CentOS 6.3 x86_64 server and I am trying to install lighttpd. I have installed the EPEL repo on the server using the following: rpm -Uvh ...
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3answers
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Create an image of a CentOS system

I provide a server (and site) to a client via Rackspace Cloud Hosting, and my client wants to now host the entire thing within his own account. Since it's not possible to just transfer the ...
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2answers
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CentOS 6: Can not start NFS

I am unable to start the NFS service. When starting there is no error. But the services are stopt after it. No messages at all in /var/log/messages. Same happens to rpcbind serivce. Any idea what this ...
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150 views

Linux: sssd cache not being cleaned upon server reboot, what could be the cause and how can it be changed?

I'm using sssd in order to work with LDAP users and groups within our Linux environment. I had to rename the LDAP group of one of my Linux users and I noticed that after I finished editing the group, ...
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1answer
320 views

Centos SMTP error command not implemented

I have a vps with Centos 6.5 and postfix installed. When I want to connect to a smtp server like google or mail gun, I get the error 502 command not implemented. Can anybody help me please? This is ...
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620 views

rsnapshot: WARNING: Some files and/or directories in / vanished during rsync operation

I once in a while get this message in my rsnapshot log, and an identical message in /var/log/messages. Unfortunately, there is no other deviation from normal output, despite loglevel 5 in ...
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275 views

Exactly how much is backported into RHEL [qemu-kvm specifically]? Only security patches, or perfomance improvments too?

https://access.redhat.com/site/security/updates/backporting/?sc_cid=3093 http://froginapan.blogspot.com/2012/07/redhats-backporting-activity.html As the above two links suggest, only security patches ...
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1answer
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What is “state RELATED,ESTABLISHED” in iptables? [duplicate]

2064 871K ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED 0 0 DROP tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp flags:0x3F/0x00 0 0 DROP tcp -- * ...
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2answers
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Can I use the worker MPM with mod_php?

After reading this answer, I decided to change httpd's MPM on my server to worker. But while editing /etc/sysconfig/httpd, I noticed this comment: # The default processing model (MPM) is the ...
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2answers
45 views

How can I distinguish the base packages from the rest when running rpm -qa?

I wrote a script which along other tasks connects to a remote server and pulls a list of all installed packages and installs them, Like so: echo -e "\e[36m#===# Getting list of packages to install ...
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1answer
2k views

How to Install php ssh2 in CentOS 6 powered Nginx VPS

I'm trying to install php-ssh2 on my CentOS 6 powered VPS. I'm using Nginx as web server. I want to tell you guys that I've installed php-fpm using REMI's repo. I'm not a VPS expert. While setting up ...
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2answers
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How downgrade PHP 5.5 to 5.4 or 5.3 on centos6

I have server running centos 6, i recently upgraded the php on the server to version 5.5 and noticed that some of the scripts in laravel framework i use are breaking. i get this error Parse error: ...
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1answer
7k views

Use apache as a HTTPS to HTTP Proxy

I'm trying to configure Apache on Centos 6 to proxy and reverse proxy traffic to an http server of a third party provider. The setup should work like this: https://mydomain.com/proxy/ proxies all ...
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1answer
5k views

Explain CentOS 5 vs. CentOS 6 - why are releases not sequential?

I was confused about why my new server had CentOS 5.9 installed on it, when CentOS 6.3 is available. But CentOS 5.9, it turns out, is actually the latest release. Why are 5.x versions being released ...
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1answer
751 views

How can I fix this Samba setup on CentOS?

I'm trying to set a Samba share in /home/share on CentOS. I do not have great experience with setting up that kind of service. I've been following guides and recommendations here and there, but ...
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4answers
12k views

apache won't start httpd service start centos 6.3

I've installed CentOS 6.3 and i run the command yum install httpd after successfully installed I've typed in the terminal service httpd start nothing happend i did opened the browser and typed ...
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2answers
131 views

Determine which apps run on startup

I have a CentOS 6 32bit VPS and I'd like to determine, How do I know which apps automatically run on startup? EDIT: I have tried chkconfig --list but I don't understand what these lines meant: ...
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1answer
2k views

Problems with mysql-libs *after* installing MariaDB

I have installed MariaDB 5.3.3 on a Centos 6 server. In order to do that, I had to issue this command before installing the MariaDB-server rpm: rpm -e --nodeps mysql-libs And now mariadb and all ...
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1answer
728 views

CentOS and iptables Logging

I am working with some CentOS rules and would like to be able to log the dropped items from iptables out to a separate file. What is the best way to setup CentOS to log dropped iptables matches to a ...