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

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SSH connection establishment too slow [duplicate]

I'm having issues while connecting to my Local Centos 6.3 VM with 500 MB ram. Below is the output of ssh -vvv localhost connection: OpenSSH_6.3, OpenSSL 1.0.1e 11 Feb 2013 debug1: Reading ...
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1answer
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virt-install complains “error: no such option: --network-bridge:br0”

I was following the directions here to set up a VM in CentOS 6.4 i386/686. But I'm getting this error: $ sudo virt-install --network-bridge:br0 --name vm1 --ram=1024 --vcpus=1 --disk ...
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1answer
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Why did yum-builddep not provide the dependencies to install my rpm?

I am trying to rum my rpm package but getting this dependencies error. [root@localhost ~]# rpm -ivh /root/x86_64/asterisk-1.8.12.2-1.fc15.x86_64.rpm error: Failed dependencies: ...
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2answers
688 views

Getting error 2006 MySQL server has gone away on CentOS

I need to import a database into a freshly created CentOS 5 virtual machine. However, whenever I run the import command on the console, it stops working in about a minute and I get the error message: ...
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1answer
158 views

Systemd kills service immediately after start

I'm writing systemd unit file for OSSEC HIDS. Problem is that when systemd starts service it immediately stops them. When I use that ExecStart directive all working fine. ...
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1answer
798 views

setting up a relay port for postfix smtp on CentOS 7

A CentOS 7 server has postfix, dovecot, and mailx installed. I am able to make an IMAP connection to the server from my remote Thunderbird client running on my local devbox. But I am not able to ...
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3answers
127 views

creating and sending a self-signed public key using GnuPG in CentOS 7

I know that I can create a GPG keypair from the CentOS 7 terminal by typing gpg --gen-key and following the resulting steps, but how can I make sure that the resulting public key is self-signed? And ...
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1answer
462 views

viewing firewalld logs via remote login to CentOS 7 server

I have firewalld installed in a remote CentOS server. When I log into the server over the internet as root, I type the following command to access the firewalld logs: journalctl ...
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4answers
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How To Install Virtualbox Guest Additions On CentOS via Command Line only

Reading the Virtualbox user manual, I finally got [here], which explains how to install Virtualbox Guest Additions on a Linux guest via Command Line. But it's not clear enough for me (I just started ...
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2answers
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How to install Desktop Environments on CentOS 7?

I have recently installed CentOS 7(Minimal Install without GUI) and now I want to install a GUI environment in it. How can I install Desktop Environments on previously installed CentOS7 without ...
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10answers
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Is CentOS exactly the same as RHEL?

I'm sure this question has been asked again and again elsewhere (I did not find anything specific to CentOS vs RHEL in SE), but I would still like to ask and confirm a few specific points. I am well ...
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2answers
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How to install g++ 4.7.2 & c++11 on CentOS 5.x?

I'm trying to install the latest stable g++ and c++11. My host did it through yum install and thought that it was the latest, but it's not, and they are now saying that this is beyond their level of ...
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1answer
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BUG: soft lockup - CPU# stuck for x seconds

I've seen a few bug reports and questions (on stackexchange and elsewhere) regarding a nagging "BUG: soft lockup - CPU#<n> stuck for <dt>s!". So far, I haven't found any clue as to what ...
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4answers
88k views

How to create a FTP user with specific /dir/ access only on a Centos / linux installation

So I'm on a VPS - CentOS Linux installation. I have vsFTPd on the server. I currently have SFTP access to the server via my root user, but am now trying to create a new user with FTP access to a ...
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3answers
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How to create an unprivileged user in CentOS?

I want to create an unprivileged user to run my RhodeCode server and Celery daemon on a CentOS instance. I think the accepted definition of this is no home directory, login disabled, and no shell ...
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7answers
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“Symbolic link not allowed or link target not accessible” / Apache on CentOS 6

I've got a brand new CentOS 6 installation, which has a symlink in the document root to my development files: [root@localhost html]# ls -l total 4 -rwxrwxrwx. 1 root root 0 Sep 18 20:16 index.html ...
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2answers
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( /etc/sysconfig/iptables ) “Manual customization of this file is not recommended.” Why?

Editing this file directly /etc/sysconfig/iptables can save me so much headaches so much time and so on... and yet on the very top of the file it says.. Manual customization of this file is not ...
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Package bash-completion missing from Yum in CentOS 6

I am trying to get tab-completion working in Yum in CentOS 6 (so I can do something like yum install firefo<TAB> and get back firefox), and I have found many tutorials which say to simply do yum ...
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9answers
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yum update fails: Error: Cannot retrieve repository metadata (repomd.xml) for repository …

I'm using CentOS 6.3. When I try to update my system with yum I have this message: yum update Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: mirrors.ircam.fr * ...
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1answer
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CentOS doesn't know what the internet is

So I've done my share of investigating this problem... I just recently created a CentOS 6 VM on my LinuxMint box using VirtualBox. I left all the recommended values the same upon creation (8GB HDD, ...
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3answers
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How can I know which IRQ is responsible of high CPU usage

I've moved a server from one mainboard to another due a disk controller failure. Since then I've noticed that constantly a 25% of one of the cores goes always to IRQ however I haven't managed myself ...
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0answers
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OpenSSL Package Rebuild CentOS 6.4 [closed]

Rebuilding openssl with Elliptic Curves on CentOS 6.4 The strategy is: 1) Download the "official" CentOS source package (.src.rpm) 2) Modify the .spec file to enable elliptic curves. (change no-EC ...
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8answers
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How to extend CentOS 5 partition on VMware?

I have a CentOS 5 virtual machine and I added 20GB more to disk size. How do I initialize and extend the available space? I'm new to Linux, so what should I do? I tried loading GParted as well, ...
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4answers
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How do I combine two logical volumes that reside on a single physical volume in LVM?

I have two logical volumes, one is mounted as /, the other is mounted as /home. I want to combine them, because the / volume is constantly running out of space. (Yes, I know what's using all that ...
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1answer
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Xvfb or Firefox throwing errors & gratuitously logging

per the answer to this question, I'm running Xvfb to make a virtual display so firefox will run on my CentOS server. (I don't need to see firefox or do any actual key or screen input/output with ...
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1answer
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Configuring OpenVPN to use Firewalld instead of iptables on Centos 7

I need some help configuring OpenVPN on Centos 7 using firewalld. I used iptables on Centos 6.5 and only had to add the following lines to /etc/sysconfig/iptables: -A POSTROUTING -s "10.0.0.0/24" ...
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7answers
441 views

Are there additional ways to protect SSH connections besides firewall and RSA Keys?

Sometimes I don't have a static IP and need to administrate my web server remotely. I'm looking for any additional layers of protection I could add to make opening port 22 safer. Currently I have ...
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2answers
13k views

No network connection in CentOS 6.3 Minimal under VMWare Player

I'm trying to replicate in VMWare Player the exact same conditions I have under my Dedicated Server for testing purposes. Now, the thing is that that when I try to install something, or ping ...
3
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2answers
3k views

yum - list configure flags/options used to compile package

How can I see a list of flags/options used to configure and compile a certain package in yum, without having to install it first? Say apache, for example. $ yum list available httpd Available ...
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2answers
4k views

Issues in XRDP installation on Cent OS 6.5

I already went through the similar issue tracked in Installing XRDP on Cent OS 6.5, however it haven't helped me to fix. I am using MAC and trying to install XRDP in CentOS release 6.5 (64 bit). So ...
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7answers
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CentOS 7 Installation Failed

After hearing the news that CentOS 7 had been published, I decided to install it on my computer. I downloaded the ISO image from the CentOS official website (the one named ...
6
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2answers
14k views

How to add an item to the Applications menu?

How can I add an application to Applications > Internet in Gnome Desktop running on CentOS 6.4? Per this old Docs link, it suggests to edit /etc/xdg/menus/applications.menu. How can I add ...
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2answers
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Two ways to lock a password but only one to unlock

CentOS 6 Linux has two ways to lock a password: passwd -l usermod -L Today I found out, that they do something different. passwd writes two exclamation marks into the shadow file. # passwd -d ...
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1answer
5k views

How display log messages from previous boots under CentOS 7?

Executing journalctl under a CentOS 7 system just prints messages generated after the last boot. The command # journalctl --boot=-1 prints Failed to look up boot -1: Cannot assign requested ...
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2answers
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bridged networking with kvm

I'm trying to get a guest virtual machine connected to my network using bridging. I've come across a couple of resources online, but they seem to be out of date, deal with xen or Ubuntu or don't seem ...
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1answer
2k views

chkconfig bootup script failing, script runs good manually

I recently purchased a vps and I attempted to create a startup/restart script to start up my java program. I am running CentOS 6. The script works if I execute it manually with this command: ...
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1answer
2k views

Start network service at boot time on CentOS

I've recently reinstalled CentOS onto a computer of mine. I have OpenSSH Server on it now, as did I before I reinstalled the operating system. Here's the difference: Before, SSH started without even ...
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8answers
1k views

Linux server monitoring software

The dedicated server I'm looking after started to crash occasionally, I suspect because of overload, so I need some performance/resource based monitoring software, preferably with web interface, ...
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2answers
6k views

GLIBCXX 3.4.15 on Centos 6

I need to install GLIBCXX 3.4.15 on my Centos 6 version (to run a server for a game on Steam). I've googled around and had several websites where they installed programs where the error appeared where ...
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2answers
8k views

How to tell rsyslog to create log file if not there?

Default behaviour by rsyslog is to append traces to an existing log file. Now, I've seen (CentOs, Scientific Linux) that when rsyslog is already running, you delete the log file (e.g. the one ...
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2answers
3k views

Is it possible to add an item to the Nautilus right click menu?

I want to add an item to my right click menu, and run a command when a user clicks on it. I'm using Centos 6.2, is it possible? If yes please tell me how I can do this.
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3answers
2k views

Download ALL rpms for a product

I have two CentOS machines, one 6.3 box (A), and another CentOS 6.1. (B) 6.3 box is with internet connection, 6.1 box is without internet connection. I want to download ALL dependencies of a product ...
6
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3answers
12k views

What prevents a machine from responding to pings?

I have a CentOS release 5.4 linux box on Amazon EC2 that I'm trying to set up to be monitored via Nagios. The machine is in the same security group as the nagios server, but it seems to be ...
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2answers
1k views

Is it possible to create a directory and file inside /proc/sys?

I am running CentOS 6.2 and I need to create a subdirectory named "crypto" inside /proc/sys. Inside /proc/sys/crypto, I need to create a file named test which contains the value "1". I have tried ...
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2answers
2k views

Giving some users only SSH and shell access with limited resource usage

I'm trying to make a user that can access my server through SSH and allow it to have a shell, limited to using only, say screen and irssi. And it shouldn't it be able to see other directories except ...
5
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2answers
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xsetroot, xterm and twm are not found when starting XRDP/Xvnc (on Cent OS)

I am trying to install xrdp service on one my VPS server, and though all installed successfully I get following error after connecting via Windows MSTSC service. Following are the resources I have ...
4
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2answers
13k views

“Last” command: How to show latest user login?

As I know, the last command shows recent logins by all users. But my PC (CentOS) has been used for roughly a year, and there are many users logged. I tried to used the last command, but it just showed ...
4
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1answer
2k views

Does segfaults mean bad memory

This is a brand new server with a new install and fresh compile of Apache/PHP with nothing crazy. Just a WordPress site hosted and I get the following. Could this just mean bad RAM? If so how can I ...
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2answers
4k views

Yum update error: “can't start new thread”

I found several posts on this, but none of them work. When I do yum update, I get the error thread.error: can't start new thread; full stacktrace follows: [root@ripper234 ~]# yum update Loaded ...
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2answers
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CentOS - Issue with write permissions

I am running CentOS 6.4 and I have installed Wordpress on it. (along with LAMP) Now the problem is, that I cannot make any write changes to any files in the wordpress editor: eg. header.php, ...