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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Configuring sendmail to to route all mails externally throws errors

I had this issue of sendmail delivering mails meant for the domain locally instead of reading the mx records, but couldn't resolve it. Maybe someone could tell me if I am missing any step. I have a ...
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2answers
378 views

KVM CLI install for CentOS 6.3 defaults to Minimal Install

So I now I've installed KVM (and its associated tools and packages- libvirt, VMM etc.). On the GUI (i.e using the VMM), installation works as its supposed to. However, when I try to create a VM using ...
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1answer
472 views

Make tomcat use Oracle Java, instead of OpenJDK

I have a webapp from Atlassian, called as Crowd, in order for this app to function, i need to have tomcat, and OracleJDK. the app provides a tomcat container, but that is not what i want. I want to ...
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1answer
114 views

Vsftpd access to /var/www

I'm trying to get ftp running locally to update a drupal install. I just need the FTP user to have full access to a directory and all subdirectories. I have done /usr/sbin/setsebool -P ftp_home_dir 1 ...
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1answer
670 views

Cloud Server Error - File Does Not Exist: /var/www/html/public

I recently moved a webapp, built using Laravel, to a rackspace cloud server. The homepage resolves just fine as I have the root set in the apache config. However, when a request is made to any of ...
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1answer
584 views

The file system /dev/loop0, has reached critical status because it is 100% full

The file system /dev/loop0, which is mounted at /tmp, has reached critical status because it is 100% full. The problem is when I checked the space of hard disk I found that: /dev/loop0 space:485M ...
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1answer
1k views

How do I Install the “Basic Server” Profile onto a “Minimal” Install of CentOS 6?

Ok, I swear I know how to do this! However, it appears to have slipped my mind, and it's starting to frustrate me that I can't remember... ;) If I install CentOS 6 without the Anaconda installer it ...
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0answers
203 views

Updating Upstart on Centos 6.3

I have a Centos 6.3 server -- alone among all my Ubuntu servers for historical reasons -- with Upstart 0.6.5. I need to update that upstart to at least 1.4, and I'd prefer to do it through yum instead ...
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1answer
3k views

AD accounts on centos 6.4 not showing up despite successfull wbinfo -u

I have a centos 6.4 box with samba 3.6.9 which I have connected to MS server 2008 R2. That part seems to work fine, since I can see my AD users and groups with wbinfo -u and wbinfo -g. What does not ...
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2answers
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openLDAP Client Config for CentOS 6

I have been trying to get the users on the LDAP server to get authenticated over centOS 6 clients, but, the client will not accept the passwords of the LDAP users. I have Ubuntu Systems which ...
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2answers
380 views

How to clear/flush ntp server peer in Centos

We were using centos.pool.ntp.org for our clock sync among servers. Now we do ave a local NTP server, but the problem is servers are using the old ntp. From centos.pool.ntp.org we can see, ...
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1answer
624 views

530 Login incorrect - vsftpd w/SSL (Not using PAM?)

I cannot log in with any local users on my vsftpd running on CentOS6 32-bit. The server simply reports login incorrect. My log files look like this: [doctorblue@guardian ~]$ sudo tail ...
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2answers
886 views

Allow non-root process to listen on port 80 without doing anything drastic

For reasons beyond my comprehension, GlassFish refuses to play ball with iptables. That is, with all the correct redirection rules in place, it won't receive any redirected traffic. So I'm at plan B ...
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3answers
674 views

Httpd processes using more memory over time

I am using a 3gb memory VPS Centos 6 server.If I reboot it I get about 4 or 5 httpd services running and all of them use about 2.5% of memory (86m on the res column from top command). I am running ...
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2answers
303 views

Relationship between /etc/hosts and iptables?

I'm running a DigitalOcean Centos 6 VPS. Here's the script I used to set up iptables on Centos 6.4 64-bit: #!/bin/sh service iptables stop iptables -A INPUT -p tcp --tcp-flags ALL NONE -j DROP ...
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1answer
64 views

Remote client trying to connect to vsftpd in CentoOS returning Connection refused

I'm trying to configure the ftp service in my server. Everything seems in place, but the client always gets this response: Connection refused. This is the content of my iptables file # Generated by ...
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1answer
2k views

Centos , /dev/root is getting full. Cannot find disk space usage [duplicate]

First of all I am not a sysadmin and so this is all new for me. Running on :CENTOS 6.4 x86_64 , Cpanel/WHM 11.36.1 (build 6) Problem : My root disk is getting full but I cannot find the files that ...
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1answer
273 views

mount -t cifs with krb5i

I am trying to mount a windows 2008 R2 share on my centos6 64 server and am getting the following message as a response to the mount: mount -t cifs //esb.local/dfs /mnt/win --verbose -o ...
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2answers
4k views

Installing CentOS 6.4 on Xen 6.0: Install hangs on “Switching to clocksource hyperv_clocksource”

When I tried to install CentOS 6.4 on a Citrix XenServer 6.0, after I hit install, the installation hangs at "Switching to clocksource hyperv_clocksource" I have installed CentOS 6.0 without this ...
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2answers
778 views

Error “Illegal instruction (core dumped)” while running Puppet agent (version 3.2.1)

I just upgraded puppet to version to 3.2.1, and when running the agent, I get an error saying "Illegal instruction (core dumped)". Here is some details: Both master and agent is run on the same ...
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1answer
496 views

Corosync with Pacemaker Resource explanation

I have the following resource: primitive WowzaMediaServer lsb:WowzaMediaServer \ op monitor interval="30s" timeout="60" \ op start interval="0" timeout="60" \ op stop ...
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1answer
148 views

install nginx on centos 6 but folders isnot working give me 404 not found

I've install Nginx on CentOS 6 without control panel following these steps. I got Nginx installed successfully, see this link. But I still have a folder that isn't showing and giving me "not found ...
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2answers
1k views

How do you remove attached FC LUNS from CentOS 6?

We have a Qlogic QLE2560 HBA running on a Centos 6 server. I am needing to remove the attached LUNS remotely. I do not have any software from qlogic installed on the device. Their are 2 LUNS ...
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1answer
823 views

How to bind two ip to one domain name for failover solution in Linux (Bind) or Windows server 2008 DNS

How to bind two ip to one domain name for fail over solution in Linux (Bind) or Windows server 2008 DNS ?
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3answers
259 views

Preferred way to add a new name server to a host in Red Hat or CentOS

I am managing a particular host machine, and I would like to locally add a new name server for it to query (i.e. not changing its name server settings via the dhcp server). It seems that there are ...
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1answer
41 views

How is it determined which name server will be used for a particular interface?

According to the documentation for interface configuration files in RHEL 6, an interface can specify which name server it would like to use by including the directive DNS{1,2}=address . The ...
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1answer
303 views

iptables rule to allow Nimsoft connection over internal interface

The company I host with (Softlayer) requires me to open up port ranges 48000 to 48020 for their monitoring service. From ifconfig, these are my interfaces: eth0 Link encap:Ethernet HWaddr ...
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1answer
533 views

CentOS 6.4 SSSD + GDM problems

I'm having an issue where using SSSD it will not bring up a full desktop when using GDM. It seems to get to where it appears to be loading the desktop, then X crashes/stops then reloads GDM. If i ...
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1answer
388 views

Problems with ImageMagick 6.8.5 on CentOS 6.3

I installed ImageMagick from source per their instructions since they didn't have a matching version for our OS. http://www.imagemagick.org/script/install-source.php However, I ran make check and ...
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274 views

How to solve a long “Wait” time, on a dedicated server of a pretty large website

Thanks for reading this. We got an issue with our web server, we have a rather large website, with 500-800 concurrent users at any time, we use a dedicated server to host it, we use prefork to ...
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1answer
2k views

Resize/extend partition size CentOS

Im tasked to resize a partition on a remote server. I've read up on it and understand that i'll need unmount and use resize2fs /dev/sdato expand the partition size. Can someone please help me unmount ...
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1answer
3k views

vnc-server not installed on CentOS 6.4

while following this Guide , i did this: yum install vnc-server and it installed success fully , but rpm -q vnc-server returns package vnc-server is not installed while yum install ...
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2answers
541 views

Name Servers not resolving

I just got myself an unmanaged Dedicated VPS from OVH and I don't have a prior experience of setting up servers or DNS servers but I followed a couple of tuts and installed webmin and created NS Zones ...
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1answer
125 views

Self compiled Perl package Centos [duplicate]

I have a Centos 6 server.. I have compiled Perl 5.16 in it (in a non-standard location). Now when I try to install Some package which is dependent on Perl using yum.. Yum tries to install Perl ...
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3answers
1k views

How to mount ceph-fuse automatically with fstab?

# ceph -v ceph version 0.56.3 (6eb7e15a4783b122e9b0c85ea9ba064145958aa5) # repoquery -i ceph Name : ceph Version : 0.56.3 Release : 1.el6 Architecture: x86_64 Size : 26734691 ...
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2answers
833 views

Is subscription-manager available for CentOS?

I'm trying to fix my updater to point to a specific release. Is the subscription-manager for RedHat only? I don't see it in my CentOS 6.3 (yum) repository.
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458 views

Troubleshooting SUDO Slowness with STRACE

I'm having trouble with sudo on some systems. It is taking anywhere from 15-30 seconds to complete a sudo command or to even login to the system. I ran an strace and can see where the delay is ...
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3answers
66 views

Root access issue from localhost [closed]

I have a strange root access issue - I'm able to login as root via SSH but I'm not able login to the physical machine via terminal. Some more info: - running CentOS 6.4 - password authentication ...
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1answer
263 views

expand the size of EBS volume in EC2 of AWS (Centos 6.3)

I have a Linux Centos instance with the following volume partitions: / - 5 GB /logs - /2 GB /data - 4 TB (4 volumes, each 1 TB). I would like to add more disk space (3 TB = 3 X 1TB volume) to my ...
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3answers
2k views

chkconfig equivalent for upstart jobs on CentOS6

On RHEL6/CentOS6 what is the upstart way to: chkconfig add my-svc chkconfig my-svc on Explanation: I have written an /etc/init/xvc0.conf job. I can do start xvc0 on the CLI, but after reboot ...
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1answer
235 views

1024 connection limit on a single port

I'm running a shoutcast v1 streaming server on a CentOS box. When I start the server as root, I can stream to 1200-1300 clients without a problem. However, when I run the server as a different user ...
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0answers
286 views

Tomcat 5.5.HTTP 404, the requested resource is not available, NFSv4 mount

I am getting the HTTP 404, requested resource is not available. I do not know how to tackle this issue. Let me give you a brief overview of the environment. I have a system running on CentOS 6.4, ...
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2answers
3k views

Selinux in permissive mode, ssh key based auth and locked account

I noticed something weird regarding ssh key based login and selinux in permissive mode. Let me introduce you the setup: The server is an updated Centos 6.4 x86_64. We create user without a password ...
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1answer
220 views

yum and rpm nothing happens

I am experiencing an odd problem in CentOS 6. when I try to use yum or rpm nothing happens. For example if I type yum update it simply returns to the command prompt. I have checked that yum and ...
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2answers
1k views

Determine php script causing MySQL huge load

I'm running a young non-profit organization aiming at providing free and low cost web hosting. Since few days, our server load is around 1.5, sometimes raising to 7. top shows me that MySQL is the ...
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0answers
391 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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4answers
128 views

Good pratices to update servers? [closed]

I have many servers running CentOS 5.* and CentOS 6.*, I would like to update them, but there's some applications running and I might crash these applications, which led me to write this post with ...
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1answer
78 views

Centos install in Xen problems

I'm running ubuntu 12.04.1, and I want to install CentOS 5 or 6 using network installation via http. Using xen images from http://mirror.centos.org/centos/5.7/os/x86_64/images/xen/ my config: ...
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1answer
82 views

Whats wrong with my iptables?

Problem I cannot get requests to my server on port 80 to redirect to my client on port 8080 Server I am using a CentOS 6.3 VM as the server, the client is an Arduino Server eth0 - 172.16.145.139 ...
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23 views

Interface eth0 not reacheble outside LAN

First of all, sorry for my bad english. I configured my two interfaces, eth0 and eth1! Bove have the LAN IP 192.168.0.10 and 192.168.0.11.... everything ok. The problem is, eth0 is reacheble from ...