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
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2answers
118 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
53 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
440 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 ...
0
votes
2answers
348 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
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2answers
74 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
102 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
209 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
235 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 ...
0
votes
1answer
424 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. ...
1
vote
1answer
45 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
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0answers
37 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
83 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
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1answer
41 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
287 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. ...
0
votes
0answers
360 views

Centos: scp stalls after sending some data and then both NIC's become unavailable, what could be the reason?

I have a brand new Dell R610 server installed with latest Centos 6.4 . This server has been purchased in a bulk of 5 servers and all other servers act the same. I'm trying to scp a centos.iso file ...
1
vote
1answer
429 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
219 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
256 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 ...
3
votes
1answer
73 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
70 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
59 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
242 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
402 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
131 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 ...
3
votes
2answers
1k 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
424 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 ...
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0answers
195 views

Installing Linux on Fujitsu RX100/200 S7 Without deployment disc?

Is it possible to install for example Debian or CentOS without the deployment tools provided by Fujitsu? I've tried installing both of the distros mentioned above without any luck. It get's stuck ...
0
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1answer
59 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
1k 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
409 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
425 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 ...
1
vote
1answer
557 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
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0answers
756 views

mod_evasive fails to add ip to firewall (iptables) on CentOS

My problem is same with this question but unfortunately this question has no answer mod_evasive DOSSystemCommand not working mod_evasive installed and works by giving 403 error which is fine. But I ...
0
votes
1answer
113 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
829 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
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2answers
2k 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 ...
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0answers
745 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
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1answer
93 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
88 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": ...
0
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0answers
206 views

Procmail (permission related) - delivery fails: “process exited returning 77”

Procmail fails to deliver any mail to local users. Bounce message I receive is following: Diagnostic-Code: x-pmta;Error running "/usr/bin/procmail -t -Y -d james": process exited returning 77 ...
-3
votes
1answer
46 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
1k 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 ...
1
vote
2answers
1k 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 ...
3
votes
2answers
886 views

Is there a big difference between CentOS 6.4 to 6.2 and should I up/down-grade?

We have two separate managed web servers. One is running CentOS 6.2 and is used as a production environment for a number of sites. The second one runs CentOS 6.4, and hosts some internal applications, ...
0
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1answer
109 views

Multiple POST SQL injection from same IP [duplicate]

Recently I checked my Apache domlog and noticed the following attack: POST ...
1
vote
2answers
1k views

ImageMagick for Centos 6.4 [duplicate]

I have already installed ImageMagick on my server which is running centos 6.4 yum install ImageMagick Version is very old : 6.5.4-7 2012-05-07 Q16 I discussed about this with ImageMagick's official ...
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0answers
211 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 ...
1
vote
2answers
223 views

Cent OS 6 clock 3 minutes 35 seconds in the future

I run Cent os 6 64 bit on linode. server (incorrect): date Thu Aug 29 11:41:00 BST 2013 client (correct): date Thu Aug 29 11:37:25 BST 2013 As you can see the server clock is ...
1
vote
1answer
919 views

jailing sftp users without messy folders [duplicate]

Running ispconfig3 on CentOS6. I'm setting up a new server that will host multiple websites for different clients and I want to use sftp as a more secure option to ftp. I have successfully set up an ...