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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Standalone VM on CentOS KDC Kerberos 5 Server autentication error

After installed and configured the kerberos 5 server on a CentOS 6.7 virtual machine. I tried to authenticate my principal admin and got this error below, I don't understand why the error as it looks ...
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76 views

Apache mod-security - Deny access from IP addresses listed in a blacklist file

I want to deny access from IP addresses listed in a blacklist file (not realy matters, but the file is /etc/csf/csf.deny). This is my custom rule (at the moment..): SecRule REQUEST_URI "wp-login.php"...
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3answers
108 views

How to transfer 6 TB files using SCP?

I have 2 Linux Centos Servers. The First one is 6.7 and the second one is 7. How can I transfer all files and folders from /home/sv1/public_html from server 1 to /home/sv2/public_html in server 2 ? ...
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1answer
66 views

pidof service doesn't exist

I am trying to set init.d script for some service - let it be uptime that is located in /usr/bin/uptime. Here is my script: #!/bin/bash # description: read service #Source function library . /etc/rc....
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1answer
383 views

daemon function not found in CentOS 6.6

I am trying to set init.d script for some service - let it be less Here is my script: #!/bin/bash -xv # description: read service #Source function library if [ -x /etc/rc.d/init.d/functions ];then . ...
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1answer
108 views

MySQL Access Denied error from nodejs application running on port 4567

I can connect to a mysql database from the command line on centos 6.7: mysql -u root -h 127.0.0.1 --protocol=TCP -p; also: mysql -u root -h localhost --protocol=TCP -p; But if I connect from ...
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2answers
305 views

OpenVPN Client alongside Apache HTTPD

What is the best way to set OpenVPN Connect on the same server where Apache HTTP Deeamon is running. I have multiple domains hosted on that server and I want to configure OpenVPN on vpn.example.com ...
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1answer
44 views

ProFTPD. Can upload only in root directory, but it is failed when upload in subdirectories

I can retrieve files but cannot edit and upload. However, I can upload files and directories to root directory. Here I found a solution, but I have UIDs and GUIDs that match linux users. proftpd ...
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1answer
494 views

ldap_modify: Insufficient access (50) for cn=config as -H ldapi:/// -Y EXTERNAL

I'm setting up a second LDAP server. I've converted a slapd.conf to a slapd.d database using slaptest. I'm trying to apply this LDIF: # cat loglevel.ldif dn: cn=config changetype:modify replace: ...
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2answers
102 views

CentOS 6, 2 NICs, 1 gateway, 1 NIC doesn't work right

I have a CentOS 6 install that had 1 NIC, eth0, working fine I added another NIC, eth1. Both NICs are on the same switch, and same LAN. I copied ifcfg-eth0 to ifcfg-eth1, and then simply changed ...
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1answer
20 views

How can I determine if a package was built from source?

I am trying to determine if httpd is from the rpm or a custom build. httpd -v returns Server version: Apache/2.2.15 (Unix) Server built: Mar 3 2015 12:06:14
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78 views

Unusually high dentry cache usage leads to PHP performance degradation

We have lots of servers serving lots of requests with apache and php accessing remote memcacheds. But we are experiencing degradation from php side accessing memcached and obtaining lots of memcached ...
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1answer
150 views

Spamassassin error: spamd.sock does not exist

I am following a guide from arstechnica to install an email server on my web server. I'm not using Ubuntu as stated in the tutorial but CentOS 6. http://arstechnica.com/business/2014/03/taking-e-mail-...
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35 views

How does changing hugetlb_shm_group without a reboot effect running processes?

On CentOS6 how does changing the group id in hugetlb_shm_group and applying the change with sysctl -p effect a running process that currently is using hugepages but will not be allowed to after the ...
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1answer
167 views

How do I troubleshoot slow NIC on R610 Dell?

I recently set up 2 new R610 servers that I purchased. Summary: Both servers 100% same hardware Both installed with Centos 6.7 64bit Tested multiple switch ports, same slowness issue. Both same full ...
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45 views

Disable USB 3.0 per boot

CentOS 6.X does not support the option to boot off of a live USB. The issue is that not always am I able to disable the 3.0 port in BIOS. Is there any way of configuring CentOS to only use USB 3.0 on ...
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2answers
411 views

NTP: How to establish redundant solution for NTP servers?

In my company's infrastructure there are 5 data centers in remote locations. In each remote location, there's a pair of servers which hold DNS and NTP services and are configured on each one of the ...
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36 views

Identical VMs behave differently

I have 2 Centos 6.7 OpenVZ VPS'. I have copied the entire disk image from the first one (server1) to the second one (server2). Now I have a couple of issues with server1 that I don't have with ...
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1answer
83 views

Find source of outgoing traffic to specific UDP port [duplicate]

Since a few days ago I've been observing some strange recurrent outgoing UDP traffic from my server on port 24441 but since it's not constant, I cannot seem to find what's causing it. All I can see ...
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1answer
2k views

Install httpd24, php56 and php70 as SCL is not working with error “file not found”

Let's start saying that I have read this, this and this at Remi Blog since the question it related to those repositories. The blog entries is not helping me at all or I am missing something here but I ...
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1answer
121 views

How to allow connections in zimbra/mail client?

I installed a Zimbra server into CentOS 6, enter the admin panel via web HTTPS over port 7071, the problem is I can not access the web mail client (port 445), I can only access via localhost. I ...
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65 views

Quantum Scalar i80 - I see the tape drive, but not changer

I have a Quantum Scalar i80 connected via SAS to a CentOS 6 server. When I look in /proc/scsi/scsi, I see the tape drive, but I don't see the changer. From /proc/scsi/scsi: Host: scsi8 Channel: 00 ...
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1answer
42 views

ip tables, block all traffic to a specific ip, unless it comes from a specific ip

Here's the situation. I have multiple Apache vhosts listening on port 443 on different IPs, on the same network interface. I would like to only allow a certain IP to access one of those vhosts. In ...
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1answer
55 views

Accept all mail for a domain (from everywhere), forward mail for selected recipients to specific addresses, relay all else to a specific host

What I want to do is set up a sendmail server that accepts mail from everyone to a particular domain (say, example.com), then for a list of defined recipients sends that mail onto specified third-...
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0answers
19 views

IPB Forum not being served up properly [closed]

I have a problem when you visit the domain: http://www.luftwaffe-experten.org/ - there is a script downloaded, but why is this occurring? It should load a forum (/forums/) but never actually opens/...
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0answers
81 views

pureftpd conneting with ftp on terminal but not filezilla

I have a dedicated server with WHM which have installed pureftpd the problem is: $ ftp site.com works alright I can use dir command and see my file list however with filezilla or others like ...
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2answers
218 views

Can't start httpd centos 6 apache 2.2

I try to start httpd on centos 6 / apache 2.2 but get the following error: /etc/init.d/httpd start Starting httpd: [Sun Nov 08 20:47:36 2015] [warn] module php5_module is already loaded, skipping ...
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1answer
129 views

Upgrading CENTOS 6 to PHP 5.5 Errors

I want to upgrade my PHP version. When updating to PHP 5.5 yum -y install php55w php55w-opcache I get this error: Error: Package: php55w-opcache-5.5.30-2.w6.x86_64 (webtatic) Requires: ...
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19 views

active custom access to php.ini for one user

I active custom user php.ini. Now user's can have their own .user.ini. Now I want some of my users use this feature and others denied from using custom .user.ini. So I uncommented the line : ; To ...
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1answer
481 views

ldap_add: Other (e.g., implementation specific) error (80) when adding pw-sha2.la module

I'm getting this error when trying to add a module to OpenLDAP: # ldapadd -H ldapi:/// -Y EXTERNAL -D 'cn=config' -f ./module.ldif SASL/EXTERNAL authentication started SASL username: gidNumber=0+...
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1answer
116 views

Will Syslog-ng recreate syslog-ng.persist file if deleted?

I am running syslog-ng pe 4 lts on Centos 6. Syslog is recursing a local directory of web logs and moving them to a NAS. We are seeing that some old log lines are showing up on the NAS for current ...
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1answer
786 views

ldap_sasl_interactive_bind_s: Can't contact LDAP server (-1) for ldapi:/// on CentOS

(This is a follow-up to ldap_modify: Insufficient access (50) when changing password as we identified a separate issue during diagnostics.) Before modifying the cn=config LDAP database, I'm trying to ...
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1answer
38 views

Where to enter these network configuration [closed]

I have a dedicated server which I want to install CentOS 6.6 on. The problem is: The service provider gives me these: Network: xxx.xxx.xxx.xxx/xx Gateway: xxx.xxx.xxx.xxx Server: xxx.xxx.xxx.xxx ...
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1answer
21 views

Problems Configuring IPTABLE for Samba Share

I am trying to configure Samba on my CentOS 6 server such that only 3 IP addresses have access to the Samba Share. For some reason my iptable configuration is wrong. I have checked lines 11-15 and ...
3
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1answer
524 views

ldap_modify: Insufficient access (50) when changing password

I'm trying to modify the LDAP admin password on a fresh OpenLDAP install on CentOS 6.7 (similar to RHEL 6.7). I created a file called change_ldap_password.ldif: # Hash your password: # slappasswd -h ...
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1answer
153 views

Centos iptables: No chain/target/match by that name [duplicate]

I had a CentOS6.7 with OpenVZ. Now, I just uninstalled OpenVZ and start using Plain CentOS6.7. Due to some difficulties for using cPanel in OpenVZ. I noticed one problem when install csf in my plain ...
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2answers
34 views

Alternative ways to detect hung OpenStack/Linux services?

I have noticed on some of my linux servers that a linux service will be hung. The only way I know that it is hung is operations that rely on the service fails and when I restart the service it fails ...
2
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4answers
478 views

CentOS installing MySQL 5.6.26

My server is CentOS 6.7 x86_64. I installed mysql by yum -y install mysql-server. But this install v5.1.73. Installed: mysql-server.x86_64 0:5.1.73-5.el6_6 Dependency Installed: mysql.x86_64 0:5....
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3answers
3k views

How to install php56 on CentOS 6 x86_64

When I run yum install php php-devel php-mysql php-gd php-mbstring, it will install php5.3. yum list installed *php* Loaded plugins: fastestmirror, security Loading mirror speeds from cached hostfile ...
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2answers
67 views

How can I force CentOS to version 6.6?

I have a production server on a cloud service that runs 64-bit CentOS version 6.6. I'm setting up a local testing server that I want to have all the same software versions. I have installed CentOS via ...
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234 views

wrong # of devices in RAID set on Centos 6.7

I just set up one of our servers with Centos 6.7. It's a machine that hasn't been in use for at least a year. I had to set it up a couple of times but every time one of the problems was with the ...
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13 views

Network restart script does not complete as a cronjob [duplicate]

I have this simple script on crontab (root): (centos 6.5) if ! ping -c 1 172.20.1.1; then echo "NOT OK" >> /root/log ifconfig eth3 down sleep 5 ifconfig eth3 up else echo OK >> /root/log ...
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55 views

How to mount a this logical volume

I would like to mount /dev/sda2. How am I supposed to do that? Bellow is the output of fdisk, df, lvmdiskscan, lvdisplay, vgdisplay, lvscan. [root@IctThtSoluti-06 ~]# fdisk -l Disk /dev/sda: 1030....
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34 views

Cent Os minimal installation with Fingerprint Athuntication and Fluxbox

I just installed CentOS 7 minimal with fluxbox. I want to have fingerprint authentication to login into my os. Can anyone provide me steps to do it.
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1answer
41 views

how to configure the internal dns?

System:centos 6.5 , bind version:bind-9.8.2-0.17.rc1.el6_4.6.x86_64 I must set up an internal dns , i am not geek new for network jobs so sorry for if it is an idiot question. My centos system cannot ...
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1answer
44 views

Server frequently hangs, my client wants me to do X while the proper solution is Y

This question is more on etiquette rather than an actual server issue. 2 servers owned by a client of mine frequently stop responding (Fast, then really sluggish as in it takes 1 minute to execute ls,...
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71 views

How to Install XCache on BlueHost VPS

I have a VPS account on BlueHost. The OS is CentOS6.7 x86_64 and PHP version is 5.4.28. I followed instructions from here to install XCache and the installation failed. The installation failed ...
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1answer
46 views

Cloning / migrating a root Linux server

I'm Looking at options for cloning a Linux server. Basically the server company we're using is going bust and went down for 4 days last week so I need to act fast and use the simplest and fastest ...
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1answer
122 views

How to identify and address the root cause of a connection timeout?

Background: I'm trying to connect to an SFTP server to transfer some files. However, I noticed that I can't connect from it from one particular server. I'm able to connect from other machines on the ...
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18 views

How to find source of spamming knowing the spam mail header? [duplicate]

Context: I have a Dedicated Server hosted on Digital Ocean, called as "Droplet" and then, on it i have installed CentOS 6, and my mailing server is using EXIM. Problem: I am having spam issues on ...