CentOS is a free (as in beer and speech) GNU/Linux distribution that is community driven and based on source code released from RedHat.

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0
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2answers
53 views

Get processes running on a specific CPU core

mpstat -P ALL shows high %wa time on a single core from an 8 core CPU and I'm trying to figure out what's writing to disk. So how can I figure out what is running on that CPU core?
3
votes
1answer
256 views

Cannot PuTTY to centos with ssh

New clean server CentOS 5.5 x64 I installed SSHD following the instructions here. http://www.cyberciti.biz/faq/centos-ssh/ When I try to login to the server with PuTTY however I get the output ...
2
votes
1answer
402 views

CentOS 7 Firewall Configuration

In CentOS 6 I could type setup from the command line and I would be presented with a set of tools, one of them being Firewall configuration. I can still do this in CentOS 7, except the list no longer ...
0
votes
0answers
21 views

Is there a way to alter default mount options for the xfs filesystem?

Q1. Is there a way to alter default mount options for the xfs filesystem? E.g. for ext2/3/4 it is done in /etc/mke2fs.conf file. Q2. Also is there a way to see default mount option on the mounted xfs ...
26
votes
3answers
2k views

Is it safe to reboot a server open to the internet?

Specifically I have an iptables ruleset defined on a server running CentOS. Am I guaranteed / can I guarantee / how can I guarantee that when networking comes online (either at machine boot, or after ...
0
votes
0answers
81 views

Multiple Windows clients behind a same NAT gateway cannot connect to L2TP/IPsec VPN server at the same time

I have set up a L2TP/IPsec VPN server on a cloud VM (with a public IP address) running CentOS 6.5 (kernel: 2.6.32) with openswan/xl2tpd (openswan: 2.6.37, xl2tpd: 1.3.6). However, if multiple Windows ...
1
vote
1answer
46 views

How do I forward localhost traffic to a remote host with iptables?

I would like to set up my CentOS 6.5 box to forward connections to localhost (127.0.0.1) to the same port on a remote machine (e.g. 10.0.3.10). I've tried the iptables rule below, but when I attempt ...
0
votes
1answer
32 views

chattr: undefined symbol: set_com_err_gettext

I've moved my CentOS 6.5 installation to a new server and I'm unable to use chattr on my new server: chattr: symbol lookup error: chattr: undefined symbol: set_com_err_gettext How to resolve this ? ...
0
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0answers
36 views

libmysqlclient_r.so.15 => not found Help. CentOS 7

I am trying to open a San Andreas Multiplayer server that requires MySQL but the problem is I keep getting this issue in my server_log when i try start it > [16:51:21] Loading plugin: mysql.so ...
0
votes
2answers
40 views

Iptables unable to allow ssh through second interface

I am having an issue where as I am unable to get SSH outgoing connections to be preformed with my current firewall rules from my second interface (eth2). The machine I am trying to connect from has ...
3
votes
1answer
61 views

Device eth0 does not seem to be present on new kernel with virtualization modules loaded/compiled on kernel 3.15.6

cat /etc/udev/rules.d/70-persistent-net.rules SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:15:5D:02:14:22", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0" ...
0
votes
1answer
31 views

Cannot change default root location

I have the following configuration file: # /etc/nginx/nginx.conif # vim: ts=4 user nginx; worker_processes 1; error_log /var/log/nginx/error.log; #error_log /var/log/nginx/error.log ...
0
votes
0answers
33 views

Setting up muli-project web development server

I'm trying to set up a development server that will be used for several (web) projects by different teams (consisting of different people, some of which may be involved with more than one project). I ...
0
votes
1answer
73 views

iptables / firewall blocking traffic (even SSH) on my dedicated box

Can someone please take a look at this iptables data and tell me what's wrong with it? The paste 24h has been a nightmare, I couldn't even SSH to my server, and the only way I could manage to get the ...
-1
votes
1answer
79 views

Need to increase size of disk on Centos

I have a Linux dedicated server, I need a way more space, like 500G. I see that there is only 4G in my filesystem. I found an article to increase size Logical Volume from this article ...
1
vote
0answers
39 views

Investigate strange message from syslog@stock

I've noticed that when I'm logged into my server I sometimes get spammed a message from syslog@stock. On this server I am running a website built with Laravel and a Teamspeak 3 server running with ...
0
votes
0answers
18 views

How to install mod_logio for apache 2.2.24 (CentOS)

For some reason, my apache doesn't have mod_logio compiled by default. when I executed the command- httpd -l And it isn't there. I tried to install it executing yum install mod_logio But it ...
2
votes
2answers
40 views

Lots of major page faults in CentOS

We have a fairly complicated PHP script that's generating a lot of minor and major page faults. $> ps -o min_flt,maj_flt,time,cmd,pid 4686 MINFL MAJFL TIME CMD ...
5
votes
4answers
571 views

Should I install x86_64 or i386 RPM packages? [closed]

I am wanting to install an RPM package, but I'm not sure whether to install the x86_64 or i386 version. WHM says CENTOS 6.5 i686 virtuozzo at the top. How can I determine which version to install?
0
votes
0answers
35 views

Nginx+Tornado performance tuning?

I have written a Tornado based Server that makes readouts from files on disk available via http. The size of the readouts I am serving is either about 10kb or about 1MB. I have a server machine with ...
0
votes
1answer
65 views

CentoOs 6.5 SSL don't work cannot verify xxx certificate / javax.net.ssl.SSLHandshakeException

I have a strange problem (it's 100% server configuration problem,) for example I want to download something from Dropbox: Resolving dl.dropboxusercontent.com... 23.23.160.146, 50.17.227.107, ...
-1
votes
0answers
10 views

How to host content / web session to one locally connected display? [duplicate]

I am trying display html content on a display attached to a micro-pc. I want to be able to use the display like digital-signage and disable everything but viewing. I can run linux with a LAMP stack ...
1
vote
1answer
70 views

Hyper-v Virtual Network Switch Configuration

I have Hyper-v Running. What I am trying to do is setup a CentOS firewall box which will forward all traffic to the 2nd VM CentOS box which has an internal adapter and only seen by the 1st VM ...
0
votes
0answers
29 views

IMAP Error in rcube_imap.php (184): Login failed for postfix@example.com from X.X.X.X. LOGIN: Authentication failed

Yes, I have looked around at other posts, and not crap is changing the slightest with this issue. So please don't resort to "check the other posts". Cause none of it is helping. I am trying to setup ...
0
votes
1answer
74 views

My server goes offline when I start my OpenVPN service

I currently have a VPS with DigitalOcean and setup a OpenVPN following this tutorial: https://www.digitalocean.com/community/tutorials/how-to-setup-and-configure-an-openvpn-server-on-centos-6 and ...
0
votes
0answers
41 views

Copy over existing files without confirmation? [migrated]

I need to copy and over-write a large amount of files, I've used the following command: # cp -Rf * ../ But then whenever a file with the same name exists on the destination folder I get this ...
1
vote
3answers
204 views

sudden peak in cpu usage

We are running a 4 node/machine elastic search cluster on 12 core, 96gb RAM, 4 spinning disk machines. under normal operation most cpu usage is user and around 5-10%. Every few days, one of the ...
0
votes
1answer
38 views

Install Apache Derby on CentOS 6.4

I'm not a Java developer, my knowledge is very limited to this topic. I want to deploy a .war webservice on my Tomcat server, which fails most likely because of its Derby dependency (just a guess from ...
1
vote
1answer
25 views

Swiftmail cannot use sendmail/postfix

When I try to run some Kohana swiftmailer I get the following error in maillog: Jul 23 17:18:37 ads postfix/sendmail[5818]: fatal: execv /usr/libexec/postfix/smtpd: Permission denied The output of ...
1
vote
1answer
72 views

puppet service not stopping service (iptables)

I am trying to use a puppet master 3.1.1 to manage iptables on various servers. My local puppet agent is 2.7.19, the server OS is CentOS 5.4. ...
-2
votes
1answer
76 views

Install Piranha on Centos 7

I have tried install Piranha on Centos 7, but yum install piranha ipvsadm -y Not found the package. Is necessary modify repos or other command?
0
votes
1answer
44 views

Secure Public SSH Login w/ Limited Access

The title may make my question seem absurd, but, hear me out. The Overview: I am creating a project whereby I'd like my users to be able to connect to the server they are using to audit its ...
0
votes
0answers
59 views

Server A can see B, but B can't see A

I am setting up a network with a CentOS client, a CentOS server and a BIG-IP. The network looks like this: (client) < -- > (BIG-IP) < -- > (server) The client is on a 10.10.20.x ...
0
votes
1answer
48 views

TLS Error on OpenVPN

Client: OpenVPN 2.3.4 64bit (Works fine connecting to my pfSense at home) Server: OpenVPN 2.2.2 installed via yum Followed this guide: ...
-1
votes
1answer
50 views

Unable to connect to localhost or local ip but can connect to other servers or websites

I have a server with nginx|bind|mysql installed, everything is working fine but I am unable to connect to localhost or any websites hosted on server. I tried pinging and wget and none of them work ...
-2
votes
0answers
24 views

iptables how to refuse connection if IP is not 1.1.1.1 [duplicate]

This line works just fine alone: -A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -s 1.1.1.1 -j ACCEPT but answers i found on the internet suggest i need to use 2 lines like this: -A INPUT ...
0
votes
1answer
42 views

How can I know which user has cron jobs configured on a machine with 200+ users?

I need to build a new machine and copy properties and some cron jobs from another machine which has about 200+ users and I don't know which users have cron jobs configured. Is there a way to extract ...
0
votes
1answer
67 views

mod wsgi picks up wrong libpython2.7.so.1.0

I've compiled python 2.7.8 with: mkdir -p /usr/local/python2p7/lib ./configure --prefix=/usr/local/python2p7 --with-threads --enable-shared LDFLAGS="-Wl,-rpath /usr/local/python2p7/lib" make make ...
0
votes
1answer
77 views

chef node installation help (bootstrapping)

I am attempting to bootstrap my first node in Chef. I set-up my environment as the following Server: Centos 6.5 running Private-chef-11.1.8 (casino.xxx.com) Client: Centos 6.5 running chef-client ...
0
votes
0answers
237 views

Gnome Boxes on CentOS 7 with Windows 7 as a guest

I just installed CentOS 7 and tried to use Gnome Boxes to create some virtual machines. As long as I stick to other Linux distributions everything is fine. But I really do have trouble installing ...
0
votes
1answer
36 views

Setup my own DNS server to support wildcard domains?

My registrar doesn't support wildcard domains through their DNS system, but I can define my own DNS Services, I can't change my registrar (I know, the "why" is beyond the scope of my question :)), ...
3
votes
2answers
112 views

Use of rpm and yum for application installation in large installation environment

Our very large organization has developed a standard for hosting of applications which dictates that the application and all components on which it relies must reside in a dedicated application volume ...
-1
votes
0answers
11 views

Postfix stops responding after adding virtual account config

I am trying to configure postfix to work with virtual hosts using Centos 6.5. I am trying to recieve emails for paul@git.exampe.com. (I actually run different domain than example.com, but the third ...
2
votes
1answer
38 views

Is it possible to set a max amount of screens that can be running at once?

I'd like to know is it possible to set a max amount of screens that could be running at once on screenrc? Thanks
0
votes
0answers
48 views

phantomjs not working through browser anymore

We use phantomjs to generate pdf version of our web pages when user needs it. Unfortunately after recent whm/cpanel ugrapde it doesn't work through browser anymore. In log I see following error ( ...
1
vote
0answers
52 views

Nagios 3.5 can't send notification email despite nagios logs ok / centos6

I spent hours trying to make nagios send email notification. my contact configuration is quite simple : I juste have one : nagiosadmin, and he is the default contact. In /var/log/nagios.log, nagios ...
1
vote
2answers
57 views

Invalid character under centOS - in a config file edited under windows

edit: it was a syntax error - the IP is not supposed to be in this line. so nothing to do with encoding. Startup error: Error in "108.174.194.111 mta10.domain.com": invalid character (' ', 0x20) in ...
0
votes
1answer
35 views

Trying to Run RT(Request Tracker) on a mail Server (Zimbra), problems with web server?

I have installed zimbra and I am using it as my mail server. However I wanted to also install request tracker, so that the server could be used for admin and my other server purely as a web server. ...
0
votes
0answers
18 views

PHP-FPM showing 34 worker process despite adjusting configuration

I recently asked this question and I got an answer about how I should limit php-fpm from running 34 worker process, considering that I get on average 20 visits for one light website. So, I ...
0
votes
1answer
34 views

CentOS: Apache cannot see the NAS drive

I have a new CentOS installation which I'm setting up as a new local dev machine. My files are on a NAS & I've setup access to the NAS on '/var/www/websites/' using the mount command. I can 'ls ...