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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Kerberized NFSv4 without creating new service principals

I need to deploy NFSv4 with Kerberos authentication in an existing AD environment, however, it must be done without making any changes on the KDC... So I figured, I would need to reuse host ...
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16 views

What are the benefits of configuring rsync with rsync shares vs. without?

I know there are two or more methods of working with rsync: The first one requires that rsync would be installed on the destination machine and then you can run something like that: rsync -avz file ...
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1answer
10 views

“-O quota” must be supported by e2fsprogs

When running llmount.sh throws error mkfs.lustre FATAL: "-O quota" must be supported by e2fsprogs, please upgrade your e2fsprogs.
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16 views

CentOS 6 fail2ban fails to ban http dos requests

Fail2ban fails to ban clients that make an excessive amount of requests over HTTP. SSH bans do work fine To test this I have made several tests using ab and curl from other servers. I even made sure ...
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7 views

build memcached source on centos6.4 64bit fails

I'd like to build memcached from source on centos 6.4 x86_64 but only get following error. checking build system type... x86_64-unknown-linux-gnu checking host system type... x86_64-unknown-linux-gnu ...
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17 views

ProFTPD server - SFTP only for 1 user

We have an FTP server setup using ProFTPD and CentOS, ProFTPD has been setup with FTP, FTPS, FTPES and SFTP access. We have a user who only wants to allow access to their account via SFTP. Is there ...
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22 views

Linux: What is the right way to configure the HOSTNAME directive in /etc/sysconfig/network? [duplicate]

There's a (quiet) argument between me and my boss in regard to the right way to configure HOSTNAME directive in /etc/sysconfig/network file: As far as I know, in the HOSTNAME directive you should ...
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43 views

Installing Imagemagick on CENTOS 6.7 x86_64 plus all dependencies

First off I need to mentioned that working with servers is not my specialty and it is new to me. I have followed various tutorials and examples but keep running into dependency issues. As I understand ...
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13 views

myisamchk results in segmentation fault

My database table is marked as "in use" in phpMyAdmin. I tried to run repair on it. I get this issue and followed the instructions here: ...
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1answer
19 views

RHEL Server stuck boot screen on VMware “Wait. Wait”

I keep getting this "wait, wait.." at the message log on my RHEL 6.4 installed on VMware workstation. UPDATE: New screenshot after I removed 'rhbg quiet'
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35 views

Logical Volume (lv) OVH (centos) [on hold]

I'm trying to use KVM, I need to create a logical volume group to be able to do that. What I've tried for the past hour (been trying for at least 6 hours) `[root@gamma ~]# pvcreate /dev/sdb ...
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26 views

cannot get Spamassassin to run on Centos 6

I've installed SpamAssassin twice, once using yum install spamassassin and once downloading the source from cpan. SpamAssassin, itself runs and reports itself as v3.4.1 running on Perl 5.22.0 but ...
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1answer
26 views

Crond is running twice with CentOS [on hold]

I have the following issue that all of my cronjobs are running twice. When I do: ps aux | grep cron I see the following: root 1379 0.0 0.1 117296 1224 ? Ss Aug26 0:00 crond ...
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1answer
42 views

Virtualbox host only + NAT network slow [on hold]

I have a Virtualbox CentOS 6.6 machine. It takes a very long amount of time to ssh (like 80 seconds), but once I log in it is not as slow. I also notice when pinging something like google.com from the ...
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48 views

Centos 6.6 : Which java is selected when I run a JAR/WAR file without using java -jar command? [closed]

On a Centos 6.6 server, how can I choose which java should be selected when I run an executable JAR or WAR file without using the "java -jar" command. I mean, I'd like to execute it with a ...
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1answer
40 views

Server not sending ICMP echo reply

I'm having a weird problem with a CentOS 6.6 machine. It is a server running KVM and a few guest VMs using a bridge interface. Basically, my issue is this: The VMs on this host have no network ...
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24 views

CSF+LFD not blocking brute force on xmlrpc.php on Wordpress site

I have just installed csf+lfd on my rackspace cloud server (a vanilla LAMP stack running centos 6.7). I only tweaked a couple of settings in the default csf.conf file: the ports allowed in TCP_IN and ...
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1answer
29 views

Nagios/NSCA: Command file '/var/nagios/rw/nagios.cmd' does not exist

I installed nagios on Centos and I also want to enable NSCA on the host. The client is already configured and is sending data (I can see it when I tail the logs). However, I'm seeing the following ...
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1answer
118 views

How do I schedule a recurring reboot in CentOS 6.7?

I've run crontab -e and added this line to crontab to reboot my machine every morning at 1am. 0 1 * * * root /sbin/shutdown -r now When crond runs I see this in my logs Aug 20 01:00:01 stc-logs ...
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57 views

Unable to install foreman-installer on CentOS 6.6, what could be the reason?

I'm trying to install Puppet 3.x using Foreman-installer. I've following this guide after doing the following steps: Installed a clean installation of CentOS 6.6. Added foreman and puppet repos. ...
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1answer
45 views

x2go passphrase prompt then authentication fail

Have read following post and although it had a similar title it wasn't the same problem: Able to connect by SSH, but not x2go From windows 7 client and windows 10 client at home to centOS6.7 remote ...
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36 views

nginx with perl fastcgi-wrapper not working after reboot

I am configuring perl/CGI with Nginx on CGI shopping cart site. (I have other sites on different directory, php-fpm running on socket. ) My goal is to successfully set up perl-fastcgi running on ...
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1answer
22 views

Yum on CentOS 6 upgrading hundreds of packages? [duplicate]

I do yum updates very frequently, almost daily. I was doing a normal yum update just now and I am being asked to update a large number of packages: Install 12 Package(s) Upgrade 315 ...
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32 views

Slow CentOS6 Server - No Resource Over usage - ping unable to resolve domain.com

I have this dedicated server with CentOS 6, WHM. Server is responding extremely slow. Resource usage less than 10%. While trying to troubleshoot, i found that i can not using ping command here is ...
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Should I be worried that yum update suddenly wants to update well over 100 packages on my CentOS 6 system?

I get an email alert whenever there's something to update, and typically do them that day. This tends to happen most days. For whatever reason I've had no alerts since 20th July until today (I ...
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Why is Postfix throwing “malformed response” and “bad command startup” errors when I send mail? [duplicate]

Why is Postfix throwing "malformed response" and "bad command startup" errors when I send mail? When sending an email from my server like: mail -s testing email@example.tld this is a test EOT I ...
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1answer
34 views

Apache tomcat works temporary - restart iptables for work

I have an apache tomcat installed on CentOS linux on a VPS. I have opened port 8080 in iptables so that it will be visit-able from outside. My problem is that when I go to address example.com:8080 it ...
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22 views

ip6tables forward chain filters all ports

Trying the following on a centos 6 node (running openvz kernel) ip6tables -F ip6tables -X ip6tables -P FORWARD DROP ip6tables -A FORWARD -p tcp -m multiport --dports 21,22,80,443 -j ACCEPT ip6tables ...
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37 views

Centos 6.4 ignoring static ip address, getting dhcp address?

I have a Centos 6.4 server, which has been running at the same ip address for over a year. Today the server was rebooted, despite being setup to have a static ip, it used an ip from the dhcp server. ...
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20 views

What are the configuration differences between Apache (httpd-2.2.3-22.el5.centos) in CentOS 5 vs Apache (httpd-2.2.15-39.el6) in CentOS 6?

I understand that the later version addresses security vulnerabilities: http://httpd.apache.org/security/vulnerabilities_22.html Supposedly, http://httpd.apache.org/download.html has a full list of ...
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264 views

Linux: How to find who issued a specific command while using root account?

There's a Linux CentOS 6.5 server in my company which many employees have access to. More than that, even though it's a known bad-practice, some people are working on the server using root account. ...
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60 views

Installing Redis on CentOS 6.6 final - no package available

I've added the "EPEL" repo: Loaded plugins: changelog, downloadonly, fastestmirror, presto Loading mirror speeds from cached hostfile * elrepo: repos.mia.lax-noc.com * epel: epel.gtdinternet.com * ...
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28 views

fwknopd on Centos 6.5

I'm getting the same error as this guy. Namely, Error: Package: 1:fwknop-server-2.6.6-1.fc21.x86_64 (/fwknop-server-2.6.6-1.fc21.x86_64) Requires: libc.so.6(GLIBC_2.15)(64bit) Error: ...
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50 views

date and hwclock not in sync - why

I am on GMT+8 and I set my hwlock to UTC. [root@sjoam2 ~]# date Sat Aug 1 16:32:04 SGT 2015 [root@sjoam2 ~]# hwclock --systohc --utc [root@sjoam2 ~]# hwclock --debug hwclock from util-linux-ng ...
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291 views

CentOS How to upgrade openssh to 6.9 [closed]

I have to upgrade openssh. I follow this page just instead the rpm 6.7 to 6.9 But When I run rpm -Uvh /root/rpmbuild/RPMS/x86_64/*.rpm I had problem : error: Failed dependencies: openssh ...
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23 views

sftp server chroot initial directory

I have configured an sftp server with chroot and it works fine, the only thing that is bothering me is the initial landing directory, since the sftp user does not have write permissions in the landing ...
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33 views

Rsyslog failed to start CentOS 6.6 Final

I'm getting the following error message when trying to run: service rsyslog restart # service rsyslog restart : command not foundlog: line 2: : command not foundlog: line 3: : command not ...
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1answer
26 views

What might be using my smtp port on a new CentOS machine?

I'm trying to setup a simple email server using node smtp-server. I'm the only one that's ever accessed the machine (a CentOS 6.5 box on Digital Ocean), and I've only set up 2 http servers. I'm ...
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55 views

probing EDD boot message stays for ten minutes on centos 6.6

I am trying to bring up a Centos 6.6 qcow2 image on my virt-manager. Booting from Hard disk.... Probing EDD (edd=off to disable)... ok The guest machine stays with the above message for near ten ...
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1answer
47 views

In centos mouse and keyboard does not work after deleting /var/cache [closed]

After deleting accidentely /var/cache in centos 6.5, restart my PC, the mouse and keyboard does not work anymore
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35 views

Mail Server for a subdomain on a different Server?

I'm currently assigned the administration of a server that is accessed through a subdomain of another (not administrating example.com but y.example.com), and assigned to implement a web application on ...
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39 views

Rebooting a production CentOS 6 server that's been up for 365 days

I noticed today when running uptime that my server has been up for exactly 365 days. Which led me to google "should I periodically reboot my server". Which led me to the knowledge that YES, I should ...
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151 views

task nginx:4164 blocked for more than 120 seconds

My server was working fine for 173 days then it started to happen. Upgrading CentOS 6.6 kernel to latest one didn't helped. Rebooting helps for about 10 minutes then it starts all over again. I'm ...
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25 views

What files get modified by the authconfig?

I am trying to identify which files are edited with the following command, but can not find. authconfig --enablemd5 --enableshadow --enablecache --enablelocauthorize --enableldap --enableldapauth ...
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36 views

Supervisor 3.1.3 installed on Cento OS 6.4 hosted on DigitalOcean giving error while adding process

I have live server on Digital Ocean with Cento OS 6.4 hosted. I am trying to install supervisor for the Laravel-5 processes. But, when I try to add the process it gives me error as undefined process. ...
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132 views

Install PHP7 from Remi repo

I installed PHP7 from Remi repo with sudo yum -y install httpd sudo yum -y install epel-release wget http://rpms.famillecollet.com/enterprise/remi-release-6.rpm sudo rpm -Uvh remi-release-6*.rpm ...
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1answer
29 views

Apache Security Issue with VirtualHosts

I have setup Apache 2.2+php 5.3.3 on CentOS 6.6 and are running virtual hosts with their document roots setup like /var/www/domainFoldername and their virtual hosts configuration in httpd.conf like: ...
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21 views

CentOS Server can't exit pfSense Network

Not sure if this is a routing issue or a firewall issue, or maybe a problem with the ifcfg-file of the CentOS machine. Here is the situation. I just got a 600Mb fiber connection from my ISP into the ...
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105 views

Sensu Client not registering in Uchiwa

I have setup sensu on a Centos 6.5 box and installed/configured the client on the sensu box so it monitors itself like so /etc/sensu/conf.d/client.json { "client": { "name": "sensu", ...
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37 views

Postfix/Devcot Relay accedd denied and no SASL mechanisms

I am trying to configure Postfix and Devcot on my VPS and use it with Roundcube webmail and other Mail clients ( Outlook, Thunderbird... ). The problem that I am facing right now is that maillog ...