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Questions tagged [centos]

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

CentOS is a free (as in beer and speech) GNU/Linux distribution that is community driven and based on source code released from RedHat. CentOS aims to be 100% binary compatible with RedHat Enterprise Linux. CentOS mainly changes packages to remove upstream vendor branding and artwork.

Support & Lifecycle

Each CentOS version is maintained for up to 10 years and a new version is released approximately every 2 years.

+----------+-------------- +---------------+---------------------+
|  Version | Release date  |  Full updates | Maintenance updates |
+----------+---------------+---------------+---------------------+
| 3        | 19 March 2004 | 20 July 2006  |31 October 2010      |
| 4        | 9 March 2005  | 31 March 2009 |29 February 2012     |
| 5        | 12 April 2007 | Q1 2014       |31 March 2017        |
| 6        | 10 July 2011  | Q2 2017       |30 November 2020     |
| 7        | 7 July 2014   | Q4 2020       |30 June 2024         |
+----------+---------------+---------------+---------------------+

External Resources:

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Can't run puppet device (Could not request certificate: Could not write to... privatekeydir)

I setup puppet 4.3 on a Centos 7 server. This is a puppet master that is also running puppet agent. I am attempting to setup Puppet Device to configure a router. when I attempt to run puppet device I see this error: sudo puppet device…
red888
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NTP not syncing automatically with my internal NTP server

I installed ntp on a centos server. I modified /etc/ntp.conf replacing the default server entries with one entry to my internal NTP server's IP (1.2.3.4 is the IP of the NTP server): server 1.2.3.4 iburst When I reboot the server and run ntpstat…
red888
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S.M.A.R.T. error , 190 Airflow_Temperature_Cel , Is it a risk?

Please, I received this report by S.M.A.R.T Checking /dev/sdb.... Errors: Please note the following marginal Attributes: ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 190 Airflow_Temperature_Cel…
Mohammed OK
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yum remove *wildcard* except some packages that also matched the wildcard?

I'm trying to remove a bunch of packages that have 'abc' in it. However, I don't want to remove 'abc-def'. How can I accomplish this? For example, how to remove every packages that have 'php' in it, except 'php-common'? I tried adding --exclude to…
weeix
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Getting 404 on any text file (including robots.txt) with nginx

I recently moved my CentOS 7 machine from an Apache web server to an nginx web server, and I'm still working out various issues as I learn the in's and out's of nginx. One issue I have stumbled upon is that text files, such as robots.txt, appear to…
J.W.F.
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NVMe speed degradation after kernel upgrade

We are testing the speed of two Intel DC P3600 NVMe drives on a CentOS 7.1 system. They are configured in a software RAID1 using mdadm. After upgrading the kernel from the (very old) 3.10 to the latest 4.3 (or 4.2.5) we see can observe a very…
markz
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/var a file and not a folder

On a CentOS 5.3 server the /var folder has changed to a file. Appears to be FS corruption. Rest of the FS looks OK. Anyone know a quick way to fix this? fsck.ext3 reports the fs as clean even using a force check. It looks like the machine had the…
Daniel
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CentOS, KVM, VLANs and bridging

I need help designing networking for virtualized guests using KVM. My machine is running CentOS 7 and has 2 NICs. I'd like to achieve the following One physical interface (em1) shall be used for host access only. The host will have a pretty normal…
taranion
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CentOS takes 10 seconds to start anything

I've got CentOS 6 with Apache, Sendmail and Proftpd installed. When I try to start anything on it, I mean anything, it takes 10 seconds. Sendmail? It takes 10 seconds to send something through PHP's mail(). Proftpd? It takes 10 seconds to get past…
user3052587
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PHP on CentOS generating blank page, no errors

My sysadmin setup a virtual server using CentOS, PHP and Apache. All seems correctly installed: I get the Apache welcome page, I can find PHP using which php as well as yum list installed *php*. I can also put a file testing1.html in /var/www/html/…
pepe
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Installing nginx 1.9 on CentOS7 VPS

Apologies for the noob question. I'm trying to upgrade nginx on my DigitalOcean CentOS7 droplet from 1.8.0 to 1.9.x. This is my /etc/yum.repos.d/nginx.repo file: # nginx.repo [nginx] name=nginx…
Donniel Thomas
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Why does sendmail changes the FROM domain and how to configure the proper one?

I installed Jenkins and configured it to send emails as being sent from "jenkins@jenkins.example.com" but the address is always changed when email is being sent and I receive the mail as being sent from "jenkins@default.vps.example.com". I've…
daniels
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Pages hanging on waiting for query, consuming memory and take 2 hours to fail

See attached picture of Fusion Reactor, showing pages that just keep on running. Times have gone up into the millions and I've left them to see if they'd complete but that was when there were just 2 or 3. Now I'm getting dozens of pages that just…
Pete
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How to increase max number of allocated inodes in Linux?

I have a Centos 6 server that is running kernel 2.6.32-279.19.1.el6.x86_64. I'm experiencing an issue in which the system is hitting the max number of allocated inodes. At this moment, inode-state returns this: # cat /proc/sys/fs/inode-state 279522 …
Fernando
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DKIM - Single host - Multiple IPs

Trying to figure out the best practice for implementing DKIM on a single EC2 which will have multiple, elastic IPS. # /etc/opendkim.conf ... Mode sv Canonicalization relaxed/simple ExternalIgnoreList …
Mike Purcell
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