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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199 views

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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172 views

fsck output status displaying an odd out put after Pass 5: Checking group summary information Linux

today my server went down due to the following: Checking filesystems /dev/mapper/vg-root contains a file system with errors, check forced. /dev/mapper/vg-root: Inodes that were part of a corrupted ...
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239 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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372 views

lvs with NAT routing - horrible performance to one real server

I have an LVS setup with NAT routing and two real servers (as an FYI, we're only routing http on tcp port 80). Currently requests to real server A respond just fine, with page load times of 3-4 ...
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578 views

Configure PolicyKit to allow non-local user to perform administration tasks that require authentication

On linux with policykit, if you try to use most GUI-based administration tools over a remote connection, they refuse to authenticate. I believe this is an issue with policykit (for example, ...
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16 views

xtable geoip filter unable to load into memroy

Ok, I have a odd problem. I just got done doing the bas configuring of my server. Adding in fail2ban, postfix, apache, mysql, ect ect. I then went in and started to add the xtable addons. I ...
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34 views

Directory index full, is this fsck result OK?

I found these in my /var/log/messages: kernel: EXT4-fs warning (device md2): ext4_dx_add_entry: Directory index full! kernel: EXT4-fs warning (device md2): ext4_dx_add_entry: Directory index full! ...
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44 views

Strange requests with wrong server_name and port 25 in apache / php

If I try to telnet [myserver.mydomain.com] 25 I get Trying [ip number]... telnet: Unable to connect to remote host: Connection refused but still I get strange requests such as the following ...
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52 views

Nagios 3.5 can't send notification email despite nagios logs ok / centos6

I spent hours trying to make nagios send email notification. my contact configuration is quite simple : I juste have one : nagiosadmin, and he is the default contact. In /var/log/nagios.log, nagios ...
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50 views

postfixadmin Could not log into IMAP/POP server

I had installed and configured dovecot, postfix, and postfixadmin step by step from this tutorial on my server (CentOS6). But I don't know why, when I want to create Mailbox from postfixadmin then I ...
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60 views

CentOS disk check errors with “Unable to find the checksum in the image”

I'm using the CentOS_6.5_Final minimum install ISO. I've added kernel-devel to the Packages directory, and then used createrepo to rebuild the metadata. Creating the repodata when in the ...
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52 views

Upgrade Raid 1 to Raid 0+1 and bootloader issue

I am trying to convert my current RAID 1 to RAID0+1 and facing issue in installing bootloader - please have a look what i am doing. My current configuration is RAID1(2*10GB): [root@localhost ~]# ...
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94 views

ntpd -gq do not working on CentOS 6.4

when I'm running 'ntpd -gq' from CentOS 5.10 (i686) the time is synced, but in CentOS 6.4 (x86_64) the command gets stuck (I need to stop it using ctl+c). Any idea hoe to fix it? EDIT: iptables ...
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72 views

MAGMI fails while importing big chunks of records. Ideal Mysql configuration for Magmi

Configuration: Linux Centos 6, NGINX, Mysql We are trying to use MAGMI a common tool for mass importing of data in Mysql based on webbrowser. I run in an issue. As a try to import more than a small ...
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76 views

Confirm IPTables firewall settings for NFS v4 server?

This question has been asked here before but has conflicting and possibly outdated answers. It seems to depend on OS, version of OS, and version of NFS. On a CentOS 6.5 server, the default rules are ...
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64 views

ftp freezing on upload when sending a large amount of files

I recently switched over to a new server and am coming up against an issue with uploading large amount of files. Our sites has over 15k files and the software i am using required me to upload though ...
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173 views

Regular server downtime of 6 to 12 minutes on Centos 6.5 with Apache 2.4.7

I am having continues server downtime of at 6 - 12 minutes on my new dedicated server. I had this issue before on my old server and my hosting provider managed to fix it. Now I migrated to a new ...
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637 views

Join samba4 member server

I am installing Samab4-ad in a test environment, to prepare migration from Samba3. All is done is OpenVZ VEs running CentOS 6. I have successfully installed DC1 and DC2 using sernet-samba rpms ...
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90 views

Can't make Koji Work on A Centos6 server

I setup the koji build environment in a Centos6 Machine server as suggested by the documentation (http://fedoraproject.org/wiki/Koji/ServerHowTo). I could properly access the Koji Web using http. Yet ...
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7 views

IfModule directive strange behaviour

I've configured 3 virtual servers for Apache2 under Centos6. Each server config is wrapped inside IfModule directive like this: <IfModule mod_fcgid.c> Listen 15100 NameVirtualHost ...
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475 views

CentOS 6.5 Xen Virtual Machine Issue 'this function is not supported by the connection driver'

I am trying to segment my system into a number of virtual machines but just cant seem to get this to work. I think I am close but not quite there. I have install xen, virsh, xl etc and I am using ...
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315 views

dhcping “no answer” on CentOS 6.4

I installed a DHCP server (yum install dhcp) and this is my conf: # create new # specify domain name option domain-name "mydomain.name"; # specify DNS's hostname or IP address option ...
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35 views

Routing issues between virtual web server and exchange server

So I've got a virtual web server running CentOS 6.3. Trying to build a mail application on a website that uses SMTP authentication on the (Windows) Exchange server but it keeps failing though the ...
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436 views

Cent OS 6.4 VPS went down unexpected

I have a cloud VPS at Digital Ocean , Recently it went down on its own, i was using pingdom alert which notified me about it, so i booted up the VPS again to find out what caused this . How can find ...
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146 views

How to disable MD RAID or prevent degraded arrays from starting. (Centos 6.4)

I am trying to disable software RAID at boot time. My ultimate goal is to prevent the system from starting raid arrays that are in a degraded state. rd_NO_MD is present on the kernel command line by ...
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254 views

How to configure cluster.conf for failover routing two networks?

I'm routing between an "external" subnet with Internet connectivity and two "internal" subnets, using iptables forwarding on a Linux box running CentOS 6.4: I'd like to now duplicate this router ...
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179 views

Problems with kvno + Consultation with kerberos authentication settings

I have clearly identified a problem that I can not solve. I suspect I'm missing something when setting the service running on Centos 6 on Windows Server 2003. First I tell the environment that I'm ...
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142 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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206 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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284 views

Centos installation: Anaconda died after receiving signal 7

I want to install CentOS 6, 64-bit on my PC. I'm getting following error in the first stages of installation (right after media check and before starting graphical installation): Anaconda died after ...
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290 views

CentOS 6 won't load default (new) kernel, loads (another) older one instead

I am having a weird issue with a CentOS 6 system. I have upgraded the kernel twice now and when I reboot the system it still loads the older kernel. I also had a dc tech watch the screen as it ...
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135 views

Avahi persistance across direct connects / disconnects

I have a unique implementation of Avahi. My company makes a device that ships with a motherboard with dual on-board nics. One of those nics will be plugged into a customer network with either a ...
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690 views

How do I configure mod_mono to use ASP.NET 4?

I am running a VPS with Centos 6.3, with WHM 11.34.1 (build 11). I wish to use mod_mono to host an ASP.NET 4 application. (Background: I am rewriting a hobby PHP website in ASP.NET MVC 4, and want to ...
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431 views

Soap client in Centos6, zval_property_ctor in Unknown on line 0

We're having such a big problem in our Centos server in order to have working the SOAP client of PHP 5.3.3. One of our customers reported us that they were having problems to consume some webservices ...
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222 views

ESXi 4.1 CentOS 6.X eth0 unnavailable

I don't usually ask for help so directly, usually google have all i need but this time i'm seriously lost. Hope you can help me .s The thing is, i have a server with Vmware ESXi 4.1 and 5 already ...
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32 views

Where to look for regular scripts?

It seems to me that our server freezes every 30 days around noon due to the huge utilization of xvda data transfer partition - writes are 50 times higher than normally (according to the health monitor ...
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136 views

Centos 6 vsftp server

I have installed vsftpd server in my centos 6 server. I created three users.first user can access the ftp server using his system password.All the users are in chroot_list. when the second user is ...
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403 views

Configure PEAR on CentOS 6 and PLESK

I'm hoping to get a little assistance with configuring PEAR to work properly. I have a PHP file that's calling PEAR's mail and mail-mime files, and I believe I am missing some steps because I keep ...
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2k views

CURL ERROR: Recv failure: Connection reset by peer - PHP Curl

I've posted a question yesterday on stackoverflow here but think this might be server related. I'm connecting using the PHP curl functionality to a server that then generates a PDF file and sends it ...
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714 views

Adaptec 5805 on Centos 6 IRQ 16 error

I'm having a problem with Adaptec 5805 raid card http://www.adaptec.com/en-us/support/raid/sas_raid/sas-5805/ (with two SAS discs in raid) and Gigabyte motherboard GA-H67A-D3H-B3 ...
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8 views

Samba 4 vs MS Office - Error accessing the file for saving, open and read works

Description I am struggling with a rather old (well-known) issue using the latest samba 4 suite. The MS Office 2010 products refuse to save a new (or modified) file on the samba share and display a ...
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28 views

Sendmail Failing to Forward Locally Addressed Mail to Exchange Server

When a customer places an order via our (Magento CE 1.8.1.0) website, a copy of said order is supposed to be BCC'd to our sales manager. I say supposed because this was a working feature before the ...
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31 views

Get physical drive size from command line

Is there a command that tells me whether I have 2.5 or 3.5" drives in a system?
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12 views

Server Mod_security Error “406 Not Acceptable” WHM/cPanel [1234123413]

When i try to access one of the domains from browser i get an "406 Not acceptable" error. after doing a little research i figure out is due to rule ID [1234123413]. Now my concerns are: if i ...
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16 views

error: Bad prime description in line

Aug 17 09:34:17 vps-aadsshd[130428]: error: Bad prime description in line 186 Aug 17 09:34:17 vps-aadsshd[130428]: error: Bad prime description in line 187 Aug 17 09:34:17 vps-aadsshd[130428]: error: ...
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24 views

iSCSI remote boot from intel NIC working in vmware ESX, not other distro´s

The objective is to have a completely diskless Centos connected to storage via. iSCSI over a 10Gb intel X540 NIC. The ROM on the NIC is flashed as initiator and tailing the logs on the target, i can ...
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17 views

route command displays gateway backward

Very puzzling problem on CentOS 6. After I issued this command: route add -net 190.160.190.0/24 gw 191.160.203.254 I then check with the route command, but the gateway IP appears backward: ...
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18 views

How do I fix the require for python(abi) when building python module RPMs for SCL?

I'm currently trying to set up an environment for one of our apps on CentOS 6 using the SCL python33 repository. The app also requires a number of additional python modules, such as numpy, so I'm ...
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32 views

Set JAVA_HOME is not working

I'm trying to set JAVA_HOME in CentOS 6.5 by editing the file ~/.bash_profile and adding this line at end: PATH=$PATH:$HOME/bin export PATH export ...
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20 views

“Killed” Python script won't start

I'm trying to start a python script. When I execute it, it just says "Killed" It normally starts because it's a cronjob but it didn't and I tried to start it manually by typing python /myscript.py ...