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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CentOS 7 on XenServer 6.5

I am having problem trying to get CentOS 7 Graphical installer to work on XenServer 6.5 (Service pack 1). I have used CentOS 7 template. Graphical installer does not work, getting blank screen with ...
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1answer
28 views

tshark packet capture performance CentOS 6 v CentOS 7

I am attempting to capture approx 20mbit/sec worth of traffic continuously with tshark. If I capture packets with tshark on CentOS 6.5 I get around 4% to 66% packets dropped. If I do the same thing on ...
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1answer
26 views

How can I strip or rewrite the sender's name of a from address when using postfix?

Objective I'm trying to configure a CentOS 7 system so all mail sent to local system accounts gets redirected to an alternate email address. For example, if mail is sent to root I want it to be ...
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1answer
26 views

CentOS cant grow partition

I have the following problem: I have a CentOS 7 VM virtualized by Hyper-V. Initially the Disk was about 200GB since it was only used as a MailServer. Now I'm running low on available diskspace and I ...
72
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11answers
13k views

How bad is it really to install Linux on one big partition?

We will be running CentOS 7 on our new server. We have 6 x 300GB drives in raid6 internal to the server. (Storage is largely external in the form of a 40TB raid box.) The internal volume comes to ...
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5answers
2k views

nginx: php-fastcgi running but php files not executing

I have recently set up a nginx server with PHP running as FastCGI process. The server is running with HTML files however PHP files are downloading instead of displaying and PHP code is not processed. ...
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1answer
1k views

NRPE v2.15 connection refused centos 6

I have set this up on many machines, ubuntu, redhat, and centos, but am having trouble with one machine. I am using the nrpe package. I have the correct permissions for nagios users, and my config ...
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2answers
33 views

How do I block SSH connections except those originating from within a /29 block of IP's or LAN? (CentOS 7 and Ubuntu 12) [on hold]

I have already disabled root login via SSH, turned off password authentication, and implemented SSH keys. I wanna go one step further and only allow SSH connections to originate from within our ...
2
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0answers
26 views

how do I plan partitions for LUKS encryption of a CentOS 7 server?

A CentOS 7 web server needs encryption at rest. I would like to use LUKS encryption for this, but I need direction to plan how. Can I use LUKS encryption to encrypt the entire drive as one unit on a ...
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0answers
54 views

Why am I limited to ~10-20 usb devices? [migrated]

I am trying to hook up 27 USB device to an Intel NUC running CentOS 7 but no matter what I do the system can never see more than 20. I have tried multiple models of NUCs and even tried adding an ...
3
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1answer
1k views

couchdb 1.6.0 from source - jsapi.h: present but cannot be compiled

I'm trying to install couchdb 1.6.0 from source on CentOS 6.5 (EPEL resository has a very old version unfortunately) following this guide. Everything went fine until ./configure step on couchdb - ...
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1answer
34 views

Empty /var folder on FTP client even though there are files in there

I recently created a VPS server with OVH (running CentOS 7). I have installed the basic LAMP stack (without the L), as well as SSH and FTP, on a fresh install of the VPS. The FTP is what I am having ...
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0answers
11 views

openldap configuration troubles or packages bug how solve

When i configure master-master replication using this openldap packages versions, replication is working fine: openldap-2.4.23-26.res6.2.x86_64 openldap-servers-2.4.23-26.res6.2.x86_64 ...
1
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0answers
12 views

CentOS 6.6 - reshape of RAID 6 stopped

I have a CentOS 6.6 Server with 13 disks in a RAID 6. Some weeks ago, i upgraded it to 17 disks, two of them configured as spare. The reshape worked like normal in the beginning. But at 69% it ...
1
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1answer
15 views

Using ngrep to print communication in clear text on a port

Im on a CentOS Linux release 7.1.1503. I want to print out all communication in clear text on port 8058, and for this i ran the following command: sudo ngrep -pqtW byline port 8058 But running the ...
3
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2answers
5k views

403 Forbidden when trying to access a folder in document root of nginx

When I access index.php, it works fine. But on localhost/pset7, it gives a 403. Here is the permission log, -rw-r--r--. 1 root root 51 Jul 31 14:21 index.html -rw-r--r--. 1 root ...
6
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1answer
932 views

Kickoff Ansible Playbook after Cobbler install

I am working on implementing Cobbler and Ansible to do our server deploys and am having one final issue. My Ansible playbook works great, my Cobbler install works great, but the issue is in tying them ...
0
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0answers
22 views

iptable with transparent proxy, how to pass the user IP

I have a local transparent proxy, but my problem is that the packages, when re-routed, have the router IP and not the user. those are the rules that I currently have in place: iptables -t nat -A ...
3
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3answers
5k views

CentOS 6.5 new Kernel not active after reboot

Today I was running some yum updates and wanted to verify that everything went through fine by making sure I had a new kernel. To my surprise I noticed that CentOS was still running ...
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1answer
1k views

OpenStack Cinder: iSCSI login negotiation failure after reboot

I have a Cinder storage and controller node running on the same CentOS 7 box as Nova compute. Everything worked fine, until I rebooted. Now my instances can't mount volumes and I get the errors below. ...
2
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2answers
324 views

Unusual load average for an idle workstation

I have a new workstation with an unusual high load average. The machine specs are: Xeon CPUs 256 GB of RAM 4 x 512 GB SSD connected to a LSI2108 RAID controller (in raid 5) I have installed ...
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1answer
26 views

Crond is running twice with CentOS [on hold]

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
1k views

Compiling PHP on CentOS Needs MySQL PDO Configured

I am trying to compile PHP with mysql_pdo on CentOS 6 and I am having just one heck of a time trying to make it happen. Currently I am trying to compile PHP 5.2, but I am going to have to do this for ...
2
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1answer
28 views

check spamassassin DNSBL results

Is there a way to check the results of spamassassin on an email when it checks DNSBL? I see nothing in the maillog and nothing in the mail header. I do not know if it is actually querying the DNSBLs ...
0
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1answer
2k views

L2TP over IPSec VPN with OpenSwan and XL2TPD can't connect, timeout on Centos 6

I'm setting up LT2p over IPSec on my Centos 6.3 fresh install. I have iptables flushed, permit all. Whenever I try to connect, i get a 'no reply from vpn' and nothi Here's my ipsec.conf file ...
2
votes
3answers
4k views

Getting errors while making backup of whole centos with tar

I am trying this command tar cvpzf /TEMP_BACKUPS/backup.tgz --exclude=/proc --exclude=/lost+found --exclude=/tmp --exclude=/TEMP_BACKUPS --exclude=/mnt --exclude=/sys / > /TEMP_BACKUPS/mylog.txt ...
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0answers
28 views

Found someone hacking in my LAMP server centos 7 using GET request with WGET

This is a bit confusing and I think I was hit by a shellshock, by the way I'm not a sysadmin and only know a little bit about handling a linux. I'm running a website (LAMP) and hosting it in Digital ...
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2answers
3k views

Yum: No package mysql-server available in Cent OS 7

I just installed Apache on my new Digital Ocean Cent OS 7 x64 server. When following Digital Ocean's tutorial, yum cannot install mysql-server. # yum install mysql mysql-server mysql-libs ...
0
votes
1answer
6k views

how to solve NT_STATUS_HOST_UNREACHABLE in CentOS when connecting to (windows) file server via SAMBA

I am using CentOS and I need to connect to a file server running on windows. My friend told me that I need to install SAMBA to be able to do that. and so I installed samba and when I try to check if ...
2
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1answer
41 views
+100

yum updates - are .rpmnew files ever critical / important to act upon?

When yum installs updates sometimes, it will give some message like: warning: /etc/ssh/sshd_config created as /etc/ssh/sshd_config.rpmnew My thought is that it would be wise to act upon these ...
1
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1answer
13 views

DTrace limited on Centos/Fedora

I wanted to work on a problem on a Centos 6 box. I ran dtrace and it failed. It doesn't accept -n or -l or -P or any command line options. It claims to ONLY accept -h, -G, -C, -I, -s, and -o. I ...
12
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1answer
4k views

How to undo “yum remove python”

I have a Centos 6 based VPS with an ssh connection. Recently wanting to install python 2.7.2, I bravely ran: yum remove python which apparently removed yum itself being written or depends on ...
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vote
3answers
2k views

Why isn't my cronjob running?

I have a cronjob in /etc/cron.d/mycron that looks like this: 0 3 * * * apache php /path/to/my/script.php In the same file there are other cronjobs begin run as root and other users (which ...
0
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1answer
10 views

Error occurred when installing php-mcrypt on Centos 7 [duplicate]

I'm completely new to Linux in general and using Centos as a server. I tried to install the php-mcrypt extension through yum, but i'm only receiving errors. I have some difficulty interpreting what ...
0
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1answer
32 views

Virtualbox host only + NAT network slow

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 ...
2
votes
1answer
26 views

Making changes to default IPv6 route persistent in CentOS 7

I have several IPv6 addresses on a CentOS 7 server and need to make a specific v6 address the default address used in routing. I have been able to do this by modifying the route table. ip -6 route ...
0
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1answer
16 views

Why does bind allow TTL to be set record by records if different TTLs are not allowed within the same record set

Why does bind allow TTL to be set record by records if different TTLs are not allowed within the same record set? If i set the zone ttl using: $TTL 39600 And then set a record TTL using: @ ...
0
votes
1answer
1k views

How to install pecl spidermonkey on CentOS 6

Running the following command: > sudo pecl install spidermonkey I receive the following error: ... ... a bunch of successful checks ... ... checking whether to enable spidermonkey support... ...
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0answers
22 views

Centos 5.11 and Redis server 2.2

I am in the process of installing redis onto my server, I have the installation nearly complete (I can start up an instance of redis), but I get the following message, 9180] 26 Aug 01:19:39 * Server ...
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vote
0answers
31 views

High CPU Usage Top isn't Showing Processes

Hey I'm having a weird issue that I'm having some difficulty diagnosing. I have a VM that went down due to high CPU usage today. The websites on this VM are very low traffic, so I knew something ...
0
votes
1answer
17 views

Setup a openldap proxy to another LDAP server on centos 6

I'm trying to get a local server to authenticate to its own openldap-server and then proxy to corporate LDAP if user is not found locally. Local users work Auth to local LDAP server works Auth to ...
3
votes
3answers
43 views

How can I delete old log files?

I'm trying to figure out how can I delete old log files, I'm using Centos 6.5 and in my /var/log I see these old log files messages messages-20150802 messages-20150802 also the same in the ...
0
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1answer
1k views

How to increase nginx connections

I am facing the problem of nginx max connection issues. I am not able to increase max active connections(520) made by nginx. Some time it is using whole writing (516) operation connections. and due to ...
3
votes
1answer
1k views

VSFTPD - FTP over TLS - Upload stops after exactly 82k?

I installed a VSFTP daemon on a CentOS server, using a RSA certificate for logging in using explicit TLS. Now, I cannot upload more than 82k. With files under that limit, there is no problem. The FTP ...
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2answers
25 views

HAProxy mysql configuration

I tried few times, but I cannot figure it out why my mariadb load balancer with haproxy is not working. I have : 1 HAProxy (CentOS) : 10.181.102.249 1 Master (CentOS) : 10.183.241.150 2 Slaves ...
2
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1answer
24 views

Send mail service start error

I installed sendmail on CentOS based on some tutorial. When I start sendmail, it showing sendmail failed error. Here the following command result: systemctl status sendmail sendmail.service - ...
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2answers
1k views

partprobe will not work..i have tried everything

I am days before the RHCSA exam and i have noticed i still haven't been able to successfully run partprobe successfully after months on testing and testing and testing..not a single time I have tried ...
1
vote
2answers
44 views

Cannot ping centos7 host

I am doing this for the first time, so I may be missing something very basic. I installed Centos 7 on a new server and have successfully gotten the connectivity working. Now I want to be able to ssh ...
0
votes
1answer
36 views

Can't connect to Nginx from remote browser (weird issue)

I've got a really weird issue with Nginx, I can't access it from my browser. I have installed a CentOS 7 virtual machine on my computer with Nginx, PHP-FPM and MariaDB installed and configured. The ...
2
votes
1answer
39 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 ...