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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3
votes
3answers
812 views

Forward secrecy in Nginx (CentOS6)

I am trying to enable Forward secrecy in CentOS with nginx webserver. What I have tried I have read some tutorials and seems like we should have nginx, openssl latest versions to enable it. So I had ...
0
votes
1answer
3k views

Can't mount home after trying to resize (bad geometry: block count exceeds size of device).

This is on a fresh computer (super computer actually). It got to me with 15T on the home mount and 50G on the root. I tried allocating 7T to root and resizing (since I'm putting a local yum repo on ...
0
votes
1answer
3k views

Input/output error reading USB backup drive on CentOS 6.4

I'm suddenly seeing some strange behaviour on our USB backup drive that doesn't make sense to me: (2013-10-21 14:58:23 [root@newdc /]$ cd /mnt/backup/ (2013-10-21 14:59:03 [root@newdc backup]$ ls -la ...
2
votes
2answers
86 views

ESXI Snapshots on a CentOS VM

On reverting back to a snapshot on one of my CentOS VM's the date is obviously set back to the original snapshot date. I was wondering if anyone knew of any other changes to the server (apart from ...
1
vote
1answer
1k views

Cacti Graphing not working

I've tried setting up Cacti on CentOS 6 with mariadb, nginx 1.4, php 5.4.x I just can't get the graphs to update My cacti files are all owned by user nginx, so my crontab file /etc/cron.d/cacti has ...
8
votes
2answers
36k views

How can I find current ssh protocol version of current connection?

I connect to a linux machine (centos 6.4) ussing putty. Except from fact that I can set putty to only use one type of protocol, how can I find the current's ssh connection version (SSH1 or SSH2)?
0
votes
1answer
700 views

How do I check if server really has RAID 10 enabled?

I have a dedicated server with 4 hdd and RAID 10, with Cent OS 6.4 How can I check if RAID is really enabled. I'm in doubt because on another server with RAID 10 enabled, I can see in /dev sg0 sg1 ...
0
votes
1answer
53 views

Confusing MySql Error

I am trying to install an application on CentOS, and see this error in my apache log. If any can help me understand what exactly is the case, I can try to work on a solution for the error. This is ...
-1
votes
1answer
516 views

Nagios installation issue [closed]

I am using centos6.4 and i am trying to install nagios on that system, i follow these steps: 1) Download and install repo http://dl.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm 2) ...
-1
votes
3answers
2k views

Any way to find what is filling up my disk? [duplicate]

This morning I was greeted with low disk warning on my root partition. So I started with usual investigation path and obviously the result of my first command become the one as shown below. [root@my-...
3
votes
2answers
179 views

How to disable/delete network manager

I'm on CentOS 6.4 64 bit in rescue mode and network manager keeps overwriting my resolv.conf and the command chkconfig is "unknown" so how do I disable/delete network manager?
1
vote
1answer
63 views

Server connections not connecting when switching to Static IP

I have a Centos 6.4 based VM, and I'm running Virtualmin on it to host my personal site. The problem is that by default, the OS is using DHCP, even though at router level (virtual router defined ...
0
votes
1answer
847 views

Socket connection timeout over vpn

I have a server running a largely default install of CentOS 6.4. It is behind a VPN and a firewall, neither of which are managed by me - they are managed by the hosting company. When I leave an ssh ...
1
vote
2answers
536 views

Relay access denied when not send from server itself

I'm setting up Postfix & Dovecot on CentOS 6. Everything works except sending mail from withing Outlook to someone else. Receiving works & sending from ssh console as well .. I've been ...
0
votes
2answers
91 views

Optimizing Apache2 for high volume of small requests

I have a Perl script which returns a string, it's very simple and small. It is running on CentOS 6.4 with mod-prefork and mod_cgi via httpd 2.2.15 over SSL. It is the directory index, so when you ...
0
votes
2answers
116 views

Move CentOS to new raid1 hardware server

I have an existed CentOS server with a normal hard disks (2 disks sda,sdb). They very small. Now I want to update server with a RAID1 hardware and new 2 bigger disks (remove 2 old disk). How can I do ...
0
votes
1answer
587 views

Unable to adjust php.ini max upload size directive on Centos 6.3

Currently i'm setting up Centos 6.3 (64 bit) on vm and installing Wordpress: Already adjust /etc/php.ini but seems like overwritten by other settings. Suspect this is due to selinux feature. My goal ...
0
votes
1answer
351 views

Installing mcrypt extension on CentOS 6

I am trying to install the mcrypt extension on my CentOS 6 VPS. I have done the EPEL rpm and then updated everything. Now, I keep getting this error and I've also installed php-api. [root@vps ~]# yum ...
1
vote
1answer
1k views

how to backup and restore mailman?

How can I backup and restore mailman list ? Our server was hacked, We plan to reload OS. We are having mailman list in server. I'm new to mailman, It's urgent to backup and restore mailman list. I'...
1
vote
1answer
58 views

Fail2ban still adding to log after uninstall

I am running a CentOS6 VM and I have been playing with Fail2ban, upon removing the service from my server I can see that it appears to be still posting logs to the /var/log/maillog Here is a link a ...
1
vote
0answers
40 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 ...
-3
votes
2answers
90 views

Centos Server Crashed and wiped everything after network restart

Using Centos 6, I modified the hosts and network file, restarted and everything has been down. Here are the steps. modified /etc/hosts to update the ip from what my dedicated server seller originally ...
0
votes
1answer
46 views

SSL Working fine how can I add in http to https redirection?

Hi I'm having major problems with a server, SSL works perfectly WHEN connecting with HTTPS://..., I need to set up redirection from http to https. This is my ssl.conf, Centos 6, with one IP address. ...
-1
votes
1answer
664 views

SSL works fine, how can I add in https redirection from http?

Hi I'm having major problems with a server, SSL works perfectly when connecting with https://..., I need to set up redirection from http to https. This is my ssl.conf, CentOS-6, with one IP address. ...
1
vote
2answers
2k views

Unlocking Server IP via Google's DisplayUnlockCaptcha over SSH

An IP on one of my linux servers running a php script is getting a error authenticating with google's SMTP server. It's rejecting the authentication even though it's the proper credentials. In the ...
0
votes
1answer
641 views

When running postfix & dovecot, who should own /var/mail and what permissions should it have?

I had an issue where either postfix or dovecot did not have permission to create user directories in /var/mail. Doing ls -l '/var/mail' showed me that the owner and group was root root. 1 root root ...
-1
votes
1answer
447 views

How to change apache php version

I have a centos 6 vm as my development environment and came with php5.3.3 By this I mean I use yum to install php (yum install php) I install php 5.4 with these instructions http://www.webtatic.com/...
3
votes
1answer
82 views

Nginx with www and without www

I have a server directive with nginx: server { listen 80; server_name mydomain.net; root /home/sites/mydomain.net; location ~ \.php$ { ...
0
votes
1answer
211 views

Creating a new system user didn't create a folder in /var/mail for the user - why not?

I am using postfix with virtual domains. Normally I add a system user, and then add the email to /etc/postfix/virtual. For the latest user I added however, there was a problem, and in the maillog it ...
0
votes
1answer
64 views

I have setup mail.mydomain.org, but now for another virtual domain, i'd like mail.thatdomain.org as well - how?

I'm using postfix and a mail dns mail.mydomain.org But now I am adding another virtual domain and I would like a mail dns for that as well, e.g. mail.mydomain.org and mail.newdomain.org. I have ...
1
vote
1answer
608 views

My postfix is letting me send emails through it without a username password - how to disable?

My postfix is letting me send emails through it without authentication. It has been setup to allow authentication, but it also allows non authenticated sending which I'd like to stop. What config ...
-1
votes
1answer
580 views

How to increase disk write-speed for SSD RAID10 array?

I've had no luck searching how to setup writeback cache on a RAID10 setup using mdadm software RAID. I'm trying to set this up for a 4x256Gb Samsung 830 SSD setup which only has 400Mb/s write speed... ...
0
votes
1answer
239 views

How to open iptables ports inside a cluster?

How can I use iptables to open ports 21001-22000 in a cluster, allowing the worker nodes to communicate between them and with the front-end? The cluster is configured with CentOS 6.3, Rocks 6.1 and ...
4
votes
2answers
5k views

check what 32-bit packages are installed on a 64-bit server

I'd like to check the binaries installed on my server and know if the is a 32-bit binary installed. rpm -qa would give me all the packages installed. However if i try to grep through it like so, rpm ...
-2
votes
1answer
2k views

How to undelete just deleted directory with “rm -R” command?

I deleted an important directory with rm -R command. This is an very populer host data. It was located /var/zpanel/hostdata/ayrintilih After remove ayrintilih directory has gone everything. I tried ...
0
votes
1answer
75 views

Getting frequently 403 Error on Apache centos6

I'm getting following error message frequently. If I hit refresh(F5) again, I get website without any issue. Forbidden You don't have permission to access /admin/product_scientist/index.php on this ...
0
votes
2answers
2k views

grub always will boot to grub command line

I have a remote CentOS 6.4 server (with KVM access), when I received the server it was running with LVM on single disk (sda) I managed to remove LVM and install raid 1 in sda and sdb disks the ...
0
votes
1answer
1k views

PMTA wont start

I ran a debug and this is what it spit out... Startup error: Error initializing thread: Error binding socket to 0.0.0.0:25, status = EADDRINUSE Never seen this before. All help is appreciated.
-1
votes
1answer
824 views

Would cPanel or Plesk slow down my site/server? [closed]

My senior sysadmin told me that if I install cPanel or Plesk (or other panel) on a client's machine as it would slow down the server/site (WordPress on LAMP). This doesn't seem to make logical or ...
2
votes
1answer
1k views

Crons not working on ISPConfig3

I have a CentOS LEMP stack with ISPConfig3. Everything is working perfectly, except for the cron jobs. I have tested the commands from command line, and they seem to be working fine, but when I put ...
0
votes
1answer
210 views

CentOS NFS server session crashes

I recently received some alerts that 2 of my backups failed to an NFS mount in my environment. After reviewing the logs I realized that the software was unable to establish a connection to the NFS ...
-1
votes
3answers
1k views

want to Make software router having two nic cards using centos 6.4

I'm new on CentOS. I have a CentOS 6.4 system having 2 NIC cards. I want to setup a gateway so I can get internet from public ip over 1st nic card (eth1) and forward the network over 2nd nic card (...
0
votes
3answers
5k views

virt-install KVM “Cannot open display ”

So I am trying to create a VM using KVM (on CentOS 6.3) and the command I use is as follows: virt-install --connect qemu:///system --virt-type kvm --name ffVM32 --ram 1024 --disk path=/home/...
1
vote
0answers
1k 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 ...
0
votes
1answer
134 views

Keep guest time after shutdown using KVM/libvirt

I use KVM/libvirt based virtualization. Some of vm guests have set date far in future (2-3 years, different month, day, etc) After each guest shutdown down, the date is being set to host date (...
-1
votes
1answer
234 views

Spamassassin failing to parse config line with user_scores_custom_query rule

I'm trying to setup spamassassin per user config files via MySQL, and I get this error: Sep 8 12:09:13.668 [12307] warn: config: failed to parse line, skipping, in "/etc/mail/spamassassin/local.cf": ...
-3
votes
1answer
61 views

CentOS Postfix Server Hanging on NULL Recipients

I have a CentOS server that runs postfix and whenever a null recipient is sent to it, the server freaks out. Instead of simply rejecting the mail, it doesn't know what to do with it and tries over and ...
0
votes
1answer
2k views

CentOS 6 restrict user ssh access to his home folder

I am trying to restrict a newly added user to his homedir /home/username. Don't want him to be able to cd out of it. I have this my sshd_config: Match User username ChrootDirectory %h ...
0
votes
1answer
2k views

Dependency problems updating Centos 6.4, 64 bit

I'm having dependency issues while trying to update Centos 6.4 ,64 bit here is the output when I run yum update: yum update Loaded plugins: fastestmirror, priorities, refresh-packagekit, security ...
3
votes
2answers
3k views

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 process-...