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.
113
questions
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Excessive number of sleeping processes in CentOS - howto diagnose? [closed]
I have a a large number of sleeping processes, about 600, the majority of which are Apache processes.
Should I kill all these sleeping processes, or will that make Apache fail completely?
Why are ...
- 171
9
votes
2
answers
5k
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Is there a big difference between CentOS 6.4 to 6.2 and should I up/down-grade?
We have two separate managed web servers. One is running CentOS 6.2 and is used as a production environment for a number of sites. The second one runs CentOS 6.4, and hosts some internal applications, ...
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13
votes
2
answers
10k
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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 ...
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34
votes
1
answer
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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 ...
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-2
votes
1
answer
4k
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How do I open custom ports in my iptables firewall? [closed]
I need IPTables, like everyone else, but I don't use it enough to really keep my knowledge complete and fresh.
The setup utility in CentOS is too basic. It doesn't seem to allow me to open up custom ...
35
votes
2
answers
90k
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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 ...
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23
votes
2
answers
45k
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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
14
votes
2
answers
50k
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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 ...
1
vote
1
answer
493
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Apache fails silently after installation of MapServer 6.2.0
THIS QUESTION SHOULD BE MARKED AS CLOSED
I've recently compiled MapServer 6.2 on a CentOS 6.3 machine, using
./configure --with-ogr=/usr/bin/gdal-config --with-gdal=/usr/bin/gdal-config --with-proj=...
- 157
54
votes
4
answers
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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 /...
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38
votes
5
answers
105k
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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 ...
- 18.8k
22
votes
3
answers
60k
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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
8
votes
1
answer
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Failed to retrieve directory listing in Filezilla connecting to vsftpd
newbie here.
At first I was unable to connect to vsftpd but I added port 21 in iptables (i'm running on Centos 6) and managed to make it work. But now, I can't get past Command: LIST in Filezilla
...
- 199
2
votes
1
answer
3k
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Specifying a Postfix Instance to send outbound email
I have a CentOS 6.5 server running Postfix 2.6x (the default distribution) with five public IPv4 IPs bound to it. Each IP has DNS and rDNS set separately. Each uses a different hostname at a ...
1
vote
1
answer
4k
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Nginx tries to run on port 80 but the configs have been removed
I have a server that runs nginx with varnish.
I cannot run nginx and varnish at the same time as the they are both trying to listen on port 80.
nginx is configured to listen on port 8080
...
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43
votes
2
answers
89k
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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 ...
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33
votes
5
answers
75k
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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
19
votes
3
answers
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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 ...
- 1,138
14
votes
2
answers
4k
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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 ...
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8
votes
5
answers
45k
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How do I Control the Ordering of Network Interfaces?
I'm attempting to configure a machine with 3 NICs, the first two are built-in GbE controllers, the third is a 10GbE controller. Via NetworkManager, I've configured the 'first' GbE NIC (which at the ...
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7
votes
3
answers
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SSH sessions terminate abruptly with message: Corrupted MAC on input. Disconnecting: Packet corrupt
We have a Dell PowerEdge 840 Server running CentOS 6.0 64 bit with 2GB ECC memory. When any user sshs in, after some time the session gets terminated with the output:
Corrupted MAC on input. Packet ...
- 676
5
votes
2
answers
4k
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Modify XFS filesystem creation parameters during kickstart installation
I'm streamlining the kickstart process for a series of EL6.2 (RHEL, CentOS, SL, etc.) systems. I'd prefer to use XFS over ext4 for the growth/data partition. However, I'd like some control over the ...
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5
votes
6
answers
5k
views
Reloading a kernel "live" in CentOS / RHEL 6
When upgrading the kernel package on CentOS or RHEL 6, is it possible to load the new kernel without rebooting?
My gut tells me it's not, but if it were, it'd be handy - especially when compiling ...
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3
votes
3
answers
7k
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Safely update php 5.3.3 to >=5.3.4 on centos 6
Would the following works fine without any issues? I have apc cache installed, the other packages the usual php configuration.
yum update php
would that be enough?
it is an active server, so want ...
2
votes
1
answer
4k
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LDAP Login fails, but su to ldap users works
I have a new ldap setup and I am trying to login, either directory to the machine or remotely over SSH.
When I try to actually login, my authentication fails.
If I login with a local user, (root), ...
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2
votes
1
answer
11k
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Howto enable SMPTS (465) postfix CentOS
I need help is enabling SMTPS. I use postfix , dovecot with MySQL(virtual domains). I do not know how to enable SMTPS(465). I already added tls related settings and key and certificate in the "/etc/...
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votes
4
answers
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How to install php56 on CentOS 6 x86_64
When I run yum install php php-devel php-mysql php-gd php-mbstring, it will install php5.3.
yum list installed *php*
Loaded plugins: fastestmirror, security
Loading mirror speeds from cached hostfile
...
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2
votes
4
answers
27k
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CentOS & moving /var to a new disk/partition
Slightly older system, roughly 2 years old. Running CentOS
I'm noticing I have /var using a lot of space, and it's all good stuff...so deleting space isn't the answer.
Is there any easy/safe way to ...
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83
votes
3
answers
144k
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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
58k
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
...
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58
votes
7
answers
79k
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
49
votes
8
answers
130k
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. ...
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19
votes
3
answers
47k
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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 $...
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19
votes
1
answer
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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 ...
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18
votes
11
answers
56k
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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
18
votes
3
answers
34k
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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
16
votes
5
answers
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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
...
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15
votes
4
answers
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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 ...
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13
votes
2
answers
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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, ...
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votes
3
answers
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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
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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
...
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11
votes
3
answers
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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 ...
- 1,371
11
votes
1
answer
13k
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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 ...
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10
votes
1
answer
41k
views
Use apache as a HTTPS to HTTP Proxy
I'm trying to configure Apache on Centos 6 to proxy and reverse proxy traffic to an http server of a third party provider.
The setup should work like this:
https://mydomain.com/proxy/
proxies all ...
- 203
10
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/...
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9
votes
3
answers
49k
views
Is subscription-manager available for CentOS?
I'm trying to fix my updater to point to a specific release. Is the subscription-manager for RedHat only? I don't see it in my CentOS 6.3 (yum) repository.
- 351
8
votes
1
answer
2k
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Block outgoing connections for certaing uids (root, apache, nobody)
With iptables in CentOS 5 and 6 Linux - how can you please prevent processes running as root, apache or nobody from initiating outgoing connections?
On CentOS 5 Linux I've tried putting these lines ...
- 714
8
votes
6
answers
42k
views
Trying to understand the correct way to create a static route in CentOS, please assist
I've been trying to understand what's the correct way to add a static route on a CentOS 6.x machine.
In some forums they say to create a file named route-dev_name (for example route-eth0) with the ...
- 10.8k
7
votes
5
answers
31k
views
Why is dhclient issuing a unicast DHCPREQUEST every ~15 seconds instead of at T1/T2 timers?
I am running a CentOS 6.2 server as my gateway and firewall, while also providing some internal services. This is a setup I have had for years using various hardware and distributions (redhat based). ...
- 101
7
votes
1
answer
10k
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Processing Conflict: mysql55w-libs-5.5.36-3.w6.x86_64 conflicts mysql-libs < 5.5
I'm trying to install the latest webtatic MySQL 5.5 edition via yum (http://webtatic.com/packages/mysql55/) on CentOS 6.5 but every time I try I get the following output ending in error:
# yum ...
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