CentOS is an Enterprise-class Linux Distribution derived from Redhat Enterprise Linux sources freely provided to the public.

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Email evading my spam filter

I'm having trouble with email evading my Barracuda Spam firewall. I believe the spammers are using my A Record to bypass my MX Record which is what directs email to my Barracuda for processing. How ...
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55 views

What variables are valid within /etc/default/useradd file?

My /etc/default/useradd file is as follow: # useradd defaults file GROUP=100 HOME=/home INACTIVE=-1 EXPIRE= SHELL=/bin/bash SKEL=/etc/skel CREATE_MAIL_SPOOL=yes man page for useradd provides many ...
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115 views

Installing owncloud8 on CentOS 6

I'm trying to install owncloud 8 on CentOS 6 - the problem is that the default CentOS repos have only php 5.3 - but owncloud 8 requires php 5.4. So following this guy: How to install Owncloud on ...
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25 views

Control TCP Connections in Python

For my college project I am trying to develop a python based traffic generator.I have created 2 CentOS machines on vmware and I am using 1 as my client and 1 as my server machine. I have used IP ...
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2answers
60 views

Allow virtual terminal switch only for root

I'm currently working on a CentOS system (with Gnome desktop), where i want to disable the use of console for non allowed users. Actually when logging in with a standard user it launch my app and ...
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9 views

How to set up Qmail to accept joining email list via Mailman LISTNAME-join@DOMAIN?

My configuration: CentOS 5.8, Plesk 11.0.9. I am trying to make my mailing list accept another way of joining a list. That is to join the Mailman mailing list by sending email to ...
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65 views

How to log failed username and plaintext passwords in dovecot server using PAM authentication?

I am configuring web mail honeypot in centOS 6.6 using SquirrelMail, postfix and Dovecot. I need to log all the entered user name and plain text passwords for web mail login. Modifications done to ...
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51 views

CentOS: Connection reset by Peer error while running python script

For my college project I am building one traffic generation tool using python. I have developed my own linux server and client on Vmware. I am using urllib2 for traffic generation in python. The ...
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2answers
105 views

Installing latest wireshark impossible?

It looks like installing a later version of wireshark is near impossible on redhat 6. I've searched the web extensively and can't find any questions where someone has said their issue was resolved. ...
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32 views

Is there any Centos package that autocompletes the commands with arrows?

In my Mac's Terminal, pressing ↑ autocompletes any word, e.g. when I type ssh + ↑ it autocompletes to the last ssh I've used. But in my Centos 7 VPS, when I press ↑, it always overwrites to the ...
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32 views

Preventing automount in CentOS 7

How can I tell CentOS 7 not to mount a new IDE drive (new to the system, but with data I want to examine) the first time I plug it in, so that I can do forensic analysis on it knowing I won't have ...
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55 views

Timezone problems with CentOS under VirtualBox

I have the following problem on a CentOS 6.5 system running under VirtualBox v4.2.4 on Windows 7 Pro SP1. date always prints a UTC time but with the correct timezone shown, e.g. if I run date at ...
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1answer
28 views

How do I limit inbound and outbound bandwidth to and from a specific host on CentOS

As the title says, I am trying to limit inbound and outbound bandwidth to and from a specific host on CentOS. The reason is that this host consistently uses a large amount of bandwidth and this needs ...
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1answer
22 views

default owner and group for symlink and chown pass-through

I have two questions but they are very closely related to each other. I have a new Debian server by Linode, and my previous server was a CentOS run by Hostgator. I use this command quite frequently ...
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2answers
41 views

Live resizing of an ext3 filesytem on CentOS6.5

I have a problem with my remote server hosted by my provider, I have only SSH access. The problem consist of getting this error file system rootfs has reached critical status that causes problems with ...
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1answer
35 views

Analyzing logs offsite, with a different computer

I have a computer deployed with no internet access. I have small windows in which to copy the log directory to a USB stick and analyze offsite. If I pull the logs off of a CentOS / RHEL system ...
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56 views

How can I let a application/user account only create and update a log file (no read permissions) in Linux

I'm attempting to setup a fairly restrictive Apache Tomcat installation on CentOS 6.6 and am stuck on file permissions for the log folder. The tomcat folder and all it's sub-directories are owned by ...
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60 views

Cannot retrieve repository metadata (repomd.xml) Centos 6.6

I'm trying to upgrade centos 6.6 with yum update I keep getting this error message Cannot retrieve repository metadata (repomd.xml) for repository: centos6 x86_64. Please verify its path and try ...
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1answer
13 views

Why doesn't my IOstat change its output at all?

My IOstat doesn't change...at all. It'll show a change in blocks being read and written, but it doesn't change at all when it comes to blocks/kB/MB read and written. When the server sits idle...it ...
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46 views

32-bit package from a repo that should only contain the 64 bit packages

Trying to a do install of some packages and it seems that it is trying to pull a 32-bit package from a 64-bit repo. Installing for dependencies: cyrus-sasl-lib i686 ...
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4answers
86 views

How can I update a password without entering the password twice?

I effectively have a sticky keyboard (host machine to RDP to vCenter to virtual console), but need to update the password of a VM I am building. Using the rescue environment CentOS media offers, I ...
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108 views

Custom compiled Nginx with ngx_pagespeed in CentOS 7 wont start

Since PageSpeed must be compiled along with Nginx, and I don't like the way instructions are in the Google page, I decided to follow another great one. Anyway, I did everything there. And when I get ...
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1answer
26 views

How to install udisks1 in CentOS 7?

I have several scripts that I need for various tasks with USB devices, but they were written with udisks1 in mind. Porting them over to udisks2 has proven difficult, if not impossible, so I'm ...
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2answers
202 views

Install mplayer on Centos 7

I've been trying for several days to install mplayer on Centos 7 without success, I've install many repos but nothing works, I've always the following error: -> Resolve Dependencies completed ...
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1answer
83 views

Problem with routing tables network interface in Centos 6.6

I've problem with the routing tables, I've 2 network interface. (2 interfaces with 2 difference network address IP address: 112.xxx.xxx.xxx: static IP and 10.xxx.xxx.xxx local IP) 1: IP address is: ...
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3answers
47 views

What does || mean in bash? [duplicate]

Apologies if this is a duplicate post. I did try searching to see if someone already asked/answered this but didn't find anything. What does || mean in bash? For example, in researching steps to ...
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1answer
20 views

unable to block out-going traffic

I've run $ iptables -I OUTPUT -j DROP -d [ip address] and found that some processes are still connecting the destination ip I've blocked above: $ lsof -p [pid] it shows: ...
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27 views

openvpn enable to connect to the server

I have centOS 7 64 bits, When I try to connect with openvpn my client.conf I have this error: Mon Mar 16 09:11:26 2015 TLS_ERROR: BIO read tls_read_plaintext error: error:14090086:SSL ...
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1answer
135 views

How can I extend VMware Partition on Centos 7 using GParted?

I've a problem with increasing a partition from 20GB to 120GB, VMDK file. Here is what I've done: using vmware-diskmanager to increase vmdk file from 20 GB - 120 GB. It's ok. download and boot from ...
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1answer
47 views

Yum update is not working properly in centos

Yum update is not working.I am not able to ping the external networks too yum update Loaded plugins: fastestmirror, refresh-packagekit, security Loading mirror speeds from cached hostfile ...
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63 views

nginx: [emerg] “server” directive is not allowed here

I get the following error message when trying to configure server: []# nginx -s reload nginx: [emerg] "server" directive is not allowed here in /etc/nginx/conf.d/hello-world.conf:1 Configuration is ...
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77 views

Do I have a dead NIC?

OK so this is kind of a long one due to command output. Not necessarily in complexity as I'm only showing some basic t-shooting so any feedback would be appreciated. Basically, I have a fairly new ...
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210 views

warning: mysqli::real_connect(): Headers and client library minor version mismatch. Headers:50537 Library:50623

warning: mysqli::real_connect(): Headers and client library minor version mismatch. Headers:50537 Library:50623 How do I do with it? I think I have a different version between mysql client and ...
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1answer
43 views

What are gpg-pubkey* packages?

I compared the packages list reported by RPM and YUM on a CentOS 6 and 7. I noticed the lists were slightly different (same issue with RHEL). See Listing installed packages with yum and rpm mismatch ...
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44 views

Yum error in Centos : beginner

"Error Type: Error Value: File contains no section headers." I got this error that pops up regurarly. I am really new to centos and am using it for schools work. I must have tried to change ...
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25 views

How to resolve issue of misconfigured vnc server on centos 7

While configuring vncserver in centos 7,the < USER >field in the vnc file gave me quite a bit of thoughts.whether it was to be replaced with the login name for accessing the ssh or some other ...
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32 views

Is it possible to convert RHEL to CentOS?

The software vendor that we used has always specified that we should load RHEL on servers we've bought to run their software however they did start to accept CentOS and even now prefer it on new ...
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1answer
23 views

Standards for dealing with older/previous “.bak” backup of config file before new edit

Assume I have a config file "foo.conf." This file is rarely edited. At some point in the BeforeTime(tm) it was edited and "foo.conf.bak" was created to save the previous state. Now, I want to make ...
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55 views

How to disable local delivery in exim Vesta CP panel

How to disable local delivery in exim VestaCP Panel, I'm getting “Unrouteable address” error message in mail log.
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1answer
121 views

CentOS 6 interfaces bonding, round-robin instead of active-backup, duplicates frames

Two interfaces, eth0 and eth1 are part of a network bonding bond0 on CentOS 6. All worked well under CentOS 5, but after the upgrade to CentOS 6.6, keeping the same configuration, the network works ...
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1answer
66 views

NginX + PHP-FPM displays blank php pages

I have a problem where my server running NginX with php-fpm loads blank PHP pages (strangely except for my phpinfo.php file, which loads normally). If I put an index.html page in the same directory ...
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35 views

putty does not allow me to input special chars

I am having trouble accessing a folder with a very long name with • in its name. seems like every time I try to input • the putty window is not parsing the character successfully. Any ideas?
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35 views

How can I disable FTP access/login for users

I want to temporarily disable the FTP Access of the FTP users I have tried following commands for user "aadmi" but still able to login sudo passwd -l aadmi which said Locking password for user ...
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113 views

Install Apache https 2.2 under Centos 7

I would like to install httpd 2.2 (httpd-2.2.15-39.el6.x86_64) under centos 7. The default repositories only have httpd 2.4 available. Does anyone know where there is a centos 7 repository that has ...
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48 views

CentOS 7 VNC users dont share desktop session

I installed VNC server on a CentOS machine. I set up a user, and then enabled the VNC server for them on startup following these steps: ...
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45 views

NFS File Mounting error in centOS

I'm trying to mount server filesystem using NFS in centos. But I'm getting Connection timed out error. Below are the steps I followed. At server side: [centos@ip-172-31-46-199 landingzone]$ sudo vi ...
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24 views

quorum disk and heuristic checking in CentOS7 Cluster

In CentOS6,we use to configure qdisk for two nodes cluster to quorate. How about in CentOS 7? I can't find any clue to do the same for it. Help will be much appreciated. Thanks,
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81 views

Two Nodes CentOS 7 Cluster clvmd

I am trying to set up two nodes CentOS 7 cluster with clvmd. I added dlmd and clvmd as clone resources in cluster using pcs command. When both nodes are up, dlmd and clvmd can start properly. But ...
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127 views

Centos 7, Postgresql 9.4 Failed to Read Permission Data Directory in mounted Partition

I've a problem with start PostgreSQL 9.4 on Centos 7 Server. Because the partition /var/lib/pgsql/9.4/data/ (which contains PostgreSQL data is full) so I want to change to another partition. ...
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62 views

md5 password hash

I'm looking to create a md5 hash to use in /etc/shadow. Someone suggested using grub-crypt. Every time I put the same password in I get a different hash. [root@endpoint ~]# grub-crypt --md5 Password: ...