Questions tagged [centos6]
CentOS was an Linux distribution standing for "Community ENTerprise Operating System" based on "Red Hat Enterprise Linux" (RHEL). The "CentOS6" tag refers to versions 6.x of CentOS. CentOS 6 was released on November 27, 2011 and reached End Of Life on November 30, 2020.
1,782
questions
83
votes
3
answers
146k
views
What does that mean: packages excluded due to repository priority protections
When updating with yum i recieve the following message:
yum update
Loaded plugins: fastestmirror, priorities
Loading mirror speeds from cached hostfile
* atomic: www7.atomicorp.com
* base: mirror....
- 1,691
70
votes
9
answers
59k
views
gpg --gen-key hangs at gaining enough entropy on centos 6
Trying to generate a key for a server.
gpg --gen-key
We need to generate a lot of random bytes. It is a good idea to perform
some other action (type on the keyboard, move the mouse, utilize the
...
- 1,459
59
votes
8
answers
298k
views
How can I find current SSH protocol version of the current connection?
I connect to a Linux machine (CentOS 6.4) using PuTTY. Except from fact that I can set PuTTY to only use one type of protocol, how can I find the current SSH connection's version (SSH1 or SSH2)?
- 709
58
votes
7
answers
80k
views
PECL command produces long list of errors
Currently running PHP 5.4 on CentOS 6.5.
I installed the webtatic php55w package then installed PEAR+PECL without issue along with redis and mongo through PECL.
Shortly after, I realized 5.5 is not ...
- 1,041
54
votes
4
answers
104k
views
EPEL Repo for CentOS 6 causing error
I've got a VM running CentOS 6 (64bit) and I'm attempting to add the EPEL repo like usual to install various packages as I do quite regularly.
Today, I'm experiencing some strange errors yet I'm doing ...
- 719
54
votes
4
answers
187k
views
ipmitool - can't find /dev/ipmi0 or /dev/ipmidev/0
Based on a previous question, I installed ipmitool (yum install ipmitool).
Even after a reboot, though, i get the following error when trying to run ipmitool power status:
Could not open device at /...
- 18.9k
50
votes
8
answers
132k
views
ls hangs for a certain directory
There is a particular directory (/var/www), that when I run ls (with or without some options), the command hangs and never completes. There is only about 10-15 files and directories in /var/www. ...
- 8,964
44
votes
3
answers
23k
views
How to allow ssh to root user only from the local network?
I've installed Google-Authenticator on a CentOS 6.5 machine and configured certain users to provide OTP.
While editing /etc/ssh/sshd_config I saw a directive "PermitRootLogin" which is commented out ...
- 10.9k
43
votes
2
answers
89k
views
CentOS /usr/local/lib system wide $LD_LIBRARY_PATH?
I install custom software in /usr/local/lib. How do I set the PATH and LD_LIBRARY_PATH in CentOS 6 system-wide to use /usr/local/lib. I realize there may be more than one way. What's the simplest and ...
- 1,952
38
votes
5
answers
107k
views
Changing the maximum mail size in Postfix
When sending large email to a new CentOS6 server running Postfix as the MTA, the following message is returned:
tried to deliver your message, but it was rejected by the recipient domain. We ...
- 18.9k
35
votes
2
answers
90k
views
How do I configure LDAP on Centos 6 for user authentication in the most secure and correct way?
During the last couple of days I have been using a lot of F-words, while browsing Internet for good documentation about how to setup an LDAP-server. So far I have found none, but plenty that are less ...
- 1,233
34
votes
2
answers
4k
views
Why is my bare-metal 16x 2.93GHz cores computer performing poorer than a VPS with 4x 2.5GHz cores?
I have a written a piece of multi-threaded software that does a bunch of simulations a day. This is a very CPU-intensive task, and I have been running this program on cloud services, usually on ...
34
votes
1
answer
36k
views
What's the difference between postfix/smtp and postfix/smtpd
A bit confused when reading through the logs of my smtp/mail server, I'm turning this questions to you guys.
In the maillog files I'm seeing entries for postfix/smtp as well as postfix/smtpd. I can ...
- 477
33
votes
5
answers
75k
views
How do I change timezone in centos 6.2?
Here is the output of my date command:
[root@r1304 ~]# date
Wed Apr 18 15:43:28 GST 2012
I want to change the default system timezone to Asia/Dubai. I've followed a tutorial and did this:
ln -sf /...
- 1,127
32
votes
6
answers
13k
views
How to create a symbolic link without using ln?
I deleted a critical symbolic link - libc.so.6. I have the file it should point at, but the basic commands such as ln or wget won't work anymore due to the link missing. However, echo or other Bash ...
- 535
26
votes
2
answers
17k
views
How to kill a process that never dies?
Problem
I have java process which does not die neither with SIGTERM nor SIGKILL.
logstash 2591 1 99 13:22 ? 00:01:46 /usr/bin/java -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:...
- 616
25
votes
2
answers
22k
views
How to uninstall git installed from the source? [closed]
I installed the git using this article. Now I want to uninstall the git. How to do it?
- 559
23
votes
2
answers
46k
views
How do I view the contents of a SELinux policy package
As the title says, how do I view the contents of a SELinux policy package? The resulting files end with .pp. I'm running on centos 6, but I guess it's the same way on "all" distros.
For example
...
- 1,233
22
votes
3
answers
60k
views
How do I upgrade to the latest PHP version in CentOS with yum?
I found some blog posts about this, but it's rather lack of descriptions on possible side effects.
I could really use some detailed on these steps:
How to add a repo that provides PHP 5.4 into yum
...
- 333
19
votes
3
answers
7k
views
Should I be worried that yum update suddenly wants to update well over 100 packages on my CentOS 6 system?
I get an email alert whenever there's something to update, and typically do them that day. This tends to happen most days.
For whatever reason I've had no alerts since 20th July until today (I ...
- 1,148
19
votes
3
answers
48k
views
How do you set a DATE variable to use in a log for crontab output?
I was playing aroudn with some variations of date like
DATE = $(date)
but that didnt work either
crontab -e
CRONLOG=/tmp/log/crontab.log
DATEVAR=`date +20\%y\%m\%d_\%H\%M\%S`
* * * * * echo $...
- 2,783
19
votes
6
answers
78k
views
Cannot access port 80 from remote location but works on local?
I have a linux server on configuration with apache. However I cannot get access to it using a remote computer.
I can ssh to the server normally.
my IP table:
Chain INPUT (policy ACCEPT)
target ...
- 1,541
19
votes
1
answer
22k
views
What is fastest way to copy a sparse file? What method results in the smallest file?
BACKGROUND: I'm copying a sparse qcow2 VM image that is 200GB in size, but has 16GB of allocated blocks. I've tried various methods to copy this sparse file within the same server and have some ...
- 453
18
votes
3
answers
34k
views
CentOS 6 and upstart
The new CentOS 6 comes with Upstart, replacing init. I am trying to convert an /etc/inittab file to the new upstart format. This particular server only has 15 or so inittab entries, however, other ...
- 1,253
18
votes
11
answers
56k
views
CentOS 6 and locale error
I just installed CentOS 6 and whenever I login to the system via SSH remotely, I get the following error:
-bash: warning: setlocale: LC_CTYPE: cannot change locale (UTF-8)
When I type "locale" on ...
- 543
16
votes
5
answers
55k
views
Install PHP7 from Remi repo
I installed PHP7 from Remi repo with
sudo yum -y install httpd
sudo yum -y install epel-release
wget http://rpms.famillecollet.com/enterprise/remi-release-6.rpm
sudo rpm -Uvh remi-release-6*.rpm
...
- 273
16
votes
3
answers
41k
views
Unable to change vm.max_map_count for elasticsearch
Prehistory
I have elasticsearch and SugarCRM7 running on CentOS 6.5. Every day I face the same problem: java outOfMemory error. That happens because of small vm.max_map_count value, 65530 only when ...
- 161
15
votes
4
answers
44k
views
In CentOS 6.x, how can I upgrade to Kernel 3.4?
I have a server running CentOS 6.2 with kernel version 2.6.32, but I need to increase my application Performance.
The Kernel Version 3.4 has x32abi which can improve the performance so i want to ...
- 147
14
votes
1
answer
13k
views
What is the correct way of getting crontab on CentOS 6?
I have a server running CentOS 6.2 minimal, but it doesn't appear to have crontab installed by default?
crontab -e
-bash: crontab: command not found
In searching google, I found references to a "...
- 4,646
14
votes
2
answers
50k
views
Upgrade CentOS 5.x to CentOS 6.x - tips and techniques
Now that CentOS 6.0 is making its way to the various mirror sites, I wanted to solicit opinions on the upgrade process. In working with the commercial RedHat 5.6 and 6.x distributions for the past few ...
14
votes
2
answers
4k
views
HP DL380p Gen8 (p420i controller) I/O oddity on XFS partitions
On DL380p gen8 servers using XFS on top of LVM on top of raid 1+0 with 6 disks, an identical workload results in a ten-fold increase in disk writes on RHEL 6 compared to RHEL 5, making applications ...
- 19.6k
13
votes
2
answers
22k
views
What mailer does cron use to send mail?
I am trying to debug an issue with cron not sending mail on a Centos 6 box that I did not configure. How can I determine which mailer cron is using to send mail? The crontab man page has this to say, ...
- 357
13
votes
2
answers
10k
views
Persist IP address alias across reboots in CentOS/RHEL 6 using "ip" command
I've always used the ifcfg-eth0:1 alias files to create additional addresses. However, in recent rhel documentation, it states that:
As the ip command of the iproute package now supports assigning ...
- 440
13
votes
1
answer
75k
views
How do I print the current hostname of a host in ansible
I wrote a role to edit the motd when user log into the machine, but I want to personalize the motd to print the hostname of the machine
What variable do I use? or how do I do this? template? how?
I ...
- 505
13
votes
2
answers
56k
views
Correcting CentOS System Clock
Using the time C function (number of seconds since the Epoch) shows that the time on my current CentOS 6 server is about 7 hours behind compared to another server with the correct time. How can I ...
- 347
13
votes
1
answer
61k
views
How do I read /var/log/lastlog [closed]
This is a 30GB file, I tried to open it in VIM
It does not show anything, How can I see contents of this file
This is CentOS 6.5
- 389
13
votes
3
answers
15k
views
Where is the correct place to set net.netfilter.nf_conntrack_buckets?
I'm currently trying to set net.netfilter.nf_conntrack_buckets on boot. I initially assumed that this could be done through sysctl.conf, but net.netfilter.nf_conntrack_buckets (and other net....
- 155
13
votes
4
answers
13k
views
How to use kdump/crash to investigate an OOM issue?
The problem
A server crashed after multiple "Out of memory" messages and I am trying to pinpoint the culprit. If it is in userland - which process. If it is in the kernel - which kernel module.
...
- 8,080
12
votes
3
answers
33k
views
How do I get openldap on Centos 6 to write anything to it's log files
I don't get any information in my log file for openldap on my Centos 6 server. This is how i configured it. SELinux is disabled at the moment.
First created a folder where I'd like to store the log ...
- 1,233
12
votes
2
answers
38k
views
What is the correct way to load modules for iptables on Centos 6
Where should I load iptables modules, for example ip_conntrack and ip_conntrack_ftp.
Places I have found that might be candidates, but are they?
The IPTABLES_MODULES variable in /etc/init.d/iptables
...
- 1,233
12
votes
2
answers
2k
views
service httpd restart / (98)Address already in use
Out of the blue, I can't restart apache on my CentOS 6.8 web server:
# service httpd restart
Stopping httpd: [ OK ]
Starting httpd: (98)Address already in ...
- 165
12
votes
2
answers
25k
views
How to remove old kernels on CentOS 6 (to free up boot partition)? [duplicate]
How does one determine which kernels to remove in order to free up some space on /boot partition.
Here is a scenario (some background info).
1. Parititon info (in case it helps)
# df -h
Filesystem ...
- 284
12
votes
1
answer
16k
views
Is installing a GUI on my CentOS server a good idea?
I have a new dedicated server that I'm going to create a couple of VMs on. OS will be CentOS 6.5, for the host and the VMs.
Does the GUI on the host (Gnome etc) give any real benefit when it comes ...
- 1,148
11
votes
3
answers
15k
views
Virtualbox centos no eth0
just installed a fresh centos-minimal and i can not get bridged network to work or any of the networks not even in host-only mode. when you run ifconfig there is no eth0 only a lo,
also when you cat /...
- 213
11
votes
1
answer
13k
views
Jenkins: Trying to add a dumb slave but the option is missing, any idea how to add it?
I've installed Jenkins 2.x on a server and now I'm trying to add a "Dumb slave" but the option is missing.
In this official Jenkins tutorial it says that when creating a new node the option should ...
- 10.9k
11
votes
3
answers
26k
views
OOM killer killing things with plenty(?) of free RAM
The OOM killer seems to be killing things despite having more than enough free RAM on my system:
(Full resolution)
(Full resolution)
27 minutes and 408 processes later, the system started ...
- 1,361
11
votes
1
answer
14k
views
where does RPM install custom GPG keys?
Where does CentOS/RHEL 6 store custom GPG keys? I thought /etc/pki/rpm-gpg but I installed nginx's key but unable to find it. I see it was imported properly but where is it?
wget http://nginx.org/keys/...
- 141
11
votes
3
answers
3k
views
IPA dynamic DNS updates only the AAAA record. Where are my A records?
I'm setting up a FreeIPA domain. In my lab are three virtual machines: the domain controller ipadc1, and two clients puppet and wordpress (creative, yes, I know). All three VMs are running freshly ...
- 249k
10
votes
3
answers
33k
views
Redis installation on centos 6.5
I am trying to install Redis on centos 6.5 (x64) with following line:
yum install redis
But I am getting following screen:
[root@NodeJs ~]# yum install redis
Loaded plugins: fastestmirror
Setting ...
- 247
10
votes
4
answers
67k
views
Which ports are required in order to authenticate against a ldap server in another domain which is behind a firewall?
I have a Linux domain running with sssd, let's call this domain NJ.
I'd like machines on the NJ domain to be able to authenticate against an Active Directory ldap server which resides on a different ...
- 10.9k