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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Install FreeIPA 4.1.0 on CentOS 6

I have installed FreeIPA master server in version 4.1.0 on the server with CentOS 7.1 and I need install replication server on the machine with Centos 6. Is there a way, how to install ipa-server ...
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11 views

How do I install fail2ban on CentOs 6.7? “Package will be installed… Killed” [duplicate]

I'm getting an error when I try to install it. [root@showcarpic ~]# rm -f /var/lib/rpm/__db* [root@showcarpic ~]# yum clean all Loaded plugins: fastestmirror Cleaning repos: base epel extras newrelic ...
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41 views

SGE: CentOS 6x : 'hostname is not known at qmaster as an administrative host'

I am running Sun Grid Engine 6.2u4 in CentOS Server. In CentOS 5x I am able to add a new client without any error. But in CentOS6.x the inst_sge -x is givine below error: # Checking hostname ...
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97 views

iptables outgoing default policy is accept, but some ports appear blocked

I'm new to servers and iptables. I have a web app (happens to be bugzilla) running on my Centos 6.7 apache/httpd server, and it attempts to connect out to the web (updates.bugzilla.org) via port 80. ...
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2answers
223 views

PayPal IPN SHA-256 server requirement

Recently PayPal is requiring servers to support SHA-256. Here's an article referring to this issue: ...
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1answer
114 views

Server to Server file transfer through wget

I have a dedicated server in Germany with 120GB data, since I have bought a new dedicated server in U.S, I would like to transfer all the files to new server through FTP connection, to achieve this ...
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58 views

unable to enter password when creating gpg key

I am trying to create a gpg key on a headless Centos6 system (on a VPS). After errors regarding the gpg-agent, I put the following in my .bash_profile (found in the gpg-agent man pages) gpg-agent ...
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1answer
268 views

nginx-passenger shuts down, install double checked (updated)

I just setup a vps at Bluehost. Centos 6. For 2 days my nginx server closes and logs this: [ ... ]: Signal received. Gracefully shutting down... (send signal 2 more time(s) to force shutdown) I ...
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3answers
94 views

Setting up 2 NICs, 1 for Internet 1 for Phones

I have FreePBX setup and it has 2 NICs. I've been trying to configure it out so that: eth0 will continue to be the one used for all the office phones and internal calls; and eth1 is the new NIC ...
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1answer
130 views

Comodo SSL Certificate Issues on Android Only [closed]

I run a website where I have full cpanel and limited whm access. I recently upgraded one of my domains to include SSL (A first-time experience for me). The certificates are installed in cpanel, and ...
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1answer
34 views

Server performance abysmal, should mysql have many instances running?

Mysql appears to be sucking a good chunk of memory up. Should mysql be running so many instances? I've considered upgrading the server's memory (because it's maxed) but I'm concerned there is a ...
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1answer
42 views

Why is the NTP local fudge server no longer reachable?

For many years I have had: server 127.127.1.0 # local clock fudge 127.127.1.0 stratum 10 In my /etc/ntp.conf configs - it always worked as I expected it to: ie. was mostly useless but for those ...
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10 views

Running any tui app hangs the terminal

Have never seen this before: running top or mc hangs the terminal. No Ctrl+C or Ctrl+Z works, lost control of that terminal. If I do a ps -aux in another terminal I can see that the mc or top is ...
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1answer
50 views

GSSAPI on Linux when reverse DNS lookup doesn't match AD DNS suffix

I have CentOS 6 server that has been joined to Active Directory using Samba and net ads join -k. It thus has a keytab like this: Keytab name: FILE:/etc/krb5.keytab KVNO Principal ---- ...
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1answer
280 views

Linux find: How to exclude the “.snapshot” directory from find's results?

I wrote a rsync script which uses find command to find all files which are older than 10 minutes and copies them to a remote server. The relevant part of the code is: print_log "------ Starting $0 ...
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1answer
34 views

disabe OPcache for specific website

Problem: Running OPCache on web server with production site and Development site causes problems when editing the development site, because PHP pages are cached. Question: Is it possible to turn ...
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1answer
111 views

Clamd cannot start

I am using Centos 6 and clamd (clamav daemon) cannot start: Here is the error message: Starting Clam AntiVirus Daemon: LibClamAV Error: cli_load(): Can't open file /var/clamav/lmd.user.hdb LibClamAV ...
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1answer
123 views

Cant send message by outlook, roundcube works

I have some problem with dovecot, I have added dovecot_lda support for roundcube sieve filters. Roundcube works perfectly with the filters now. But if i try send messages by smtp ...
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1answer
479 views

NTP: Should I configure NTP step-tickers in a domain which uses local NTP servers?

I've bumped into something which is called "NTP step tickers" and read about it in this article, but I'm not sure if it's required in a domain which includes local NTP servers. It seems like it ...
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2answers
171 views

Set up 4 ip addresses with Subnet mask 255.255.255.252 (30)

i bought 4 ip addresses on OVH. Then they gave me this details: 84.84.184.176/30 Network IP: 84.84.184.176 Broadcast IP: 84.84.184.179 Gateway IP: 84.84.184.178 Netmask: 255.255.255.252 And they ...
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2answers
67 views

Remote SSH login blocked without local Gnome login

I installed CentOS 6.7 from the full install media on a desktop machine at home. sshd has been reconfigured for private key authentication only. When I go to log in via SSH from my laptop (OS X ...
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1answer
241 views

phpmyadmin fails to load “PHP message: PHP Fatal error: Class 'PMA_Message' not found in /usr/share/phpMyAdmin/libraries/Message.class.php”

After upgrading some of the php libraries on our server phpmyadmin failed to load. I see the following error on my web browser when trying to access browser phpMyAdmin - Error Cannot start session ...
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1answer
317 views

Configuring CentOS 6 iptables to use port 80 for NodeJS app running on port 3000

I'm running a fresh instance of CentOS 6 using AWS. There is something in iptables that is blocking my nodejs app. Here is my nodejs app: var express = require('express'); var app = express(); ...
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0answers
70 views

Low Entropy on Container

I am thinking my entropy level may be low? cat /proc/sys/kernel/random/entropy_avail I am around 132-178 on average. pool size is default 4096 (this is a container on a virtualizer by the way) I ...
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635 views

RTNETLINK: Device or resource busy - DELL 2950

I cant start second NIC on Dell Poweredge 2950, OMSA installed, the NIC cards is BCM5708C ,version of Operating System Centos 6.7. The first card worling correctly [root@alfa ~]# ifup eth1 RTNETLINK ...
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83 views

Can't access to phpBB admin after fresh install on a CentOS server

After a fresh install straight I can login to the admin, but when I logout and try to login back I can't. No problem to login anytime to the board, to the users interface... When I click on ...
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2answers
3k views

Can't install PHP 5.5 on CentOS 6.7

I have a dedicated server on Kimsufi. I am trying to update PHP 5.3 to PHP 5.5 on CentOS 6.7 using this guide, but unfortunately i get the following errors: Error: Package: ...
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218 views

Slow mouse response in Centos 6.7 on Windows 10 Hyper-V [closed]

I'm using the standard desktop installation of Centos 6.7. Following that I installed the Linux Integration Services for Hyper-V (https://www.microsoft.com/en-us/download/details.aspx?id=46842). The ...
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1answer
833 views

No package mongodb-org available

I am attempting to install MongoDB on CentOS 6.5. I believe I am following the instructions precisely step-by-step, but continue to get the error No package mongodb-org available after issuing the ...
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2answers
44 views

Service named failed to start [closed]

Service named (DNS/Bind) is failing to start. What am I doing wrong? I think it has to do with my 155.100.198.in-addr.arpa file, but I can't see my error. I am getting the following errors: zone ...
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30 views

Centos 6.3 haproxy ports not opening (tcp)

Trying to create a tcp load balancer for my game server and i run this script >> Running on centos 6.3. The port (1337) isn't opening. global daemon log /dev/log local4 maxconn 400000 ulimit-n 810000 ...
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1answer
1k views

Instal ejabberd on centos 6.7 - epel is enabled still No package ejabberd available

I am trying to install ejabberd on my centos 6.7. As I googled I found that I need to enable EPEL which I did still there is no success. Out put for yum repolist [root@static ~]# yum repolist Failed ...
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1answer
39 views

Verifying Which Ports Are Listening on the Remote server using NMAP [closed]

Using redhat, What's the good command to verify port that for example google server is listening?
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97 views

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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1answer
85 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
80 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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46 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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1answer
32 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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0answers
23 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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1answer
162 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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1answer
95 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
64 views

Crond is running twice with CentOS [closed]

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
235 views

Virtualbox host only + NAT network slow [closed]

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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1answer
143 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 ...
2
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1answer
193 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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0answers
344 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
170 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
464 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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1answer
718 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
604 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 ...