Red Hat Enterprise Linux version 5 is a Linux distribution sold by Red Hat, Inc. for the enterprise market.

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50
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6answers
13k views

Puppet vs Chef, pro and contra from users and use cases [closed]

I already googled and read the "to-puppet-or-to-chef-that-is-the-question" article. I'm interested in use cases, real world implementations in which people had choosen one or the other on real ...
13
votes
2answers
27k 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 ...
11
votes
6answers
6k views

Python 3.0 RPMs for CentOS 5 (RHEL 5)

Where is the best repository you use to obtain RPMs for Python 3.0 which are well maintained?
9
votes
6answers
1k views

How to monitor Windows host with Nagios?

How do I use Nagios to monitor Windows clients? Are there any alternative solutions available?
7
votes
5answers
5k views

RHEL5: Forbid installation of i386 packages on 64-bit systems?

Everytime I install something with yum, it tries to install both x86_64 and i386 versions of the package if both are available. Is there any way I can forbid that without specifying the arch of the ...
7
votes
1answer
4k views

CentOS 5 - realtime patch

Where can I download precompiled CentOS 5 kernel including realtime patch? Or I need to compile it myself (if yes, how to do that)?
7
votes
1answer
339 views

LSI RAID controller errors on DB import - How to troubleshoot?

We're running an import of a database dump on an Oracle system - (RHEL 5.9, 2.6.18-348.6.1.el5). The import does not complete, eventually erroring-out with: ORA-15080: synchronous I/O operation to a ...
6
votes
4answers
3k views

How can I check from the command line if a reboot is required on RHEL or CentOS?

I'm using CentOS and Red Hat Enterprise Linux on a few machines without the GUI. How can I check if recently installed updates require a reboot? In Ubuntu, I'm used to checking if ...
6
votes
2answers
342 views

How to handle large numbers of connections from an IP address?

Every couple of weeks we have an issue whereby a single IP address opens a huge number of of Apache processes at the same time. It seems to connect to similar pages each time, but our Apache ...
6
votes
2answers
150 views

Chrooting a users login

I want to limit certain users on my system to a subset of commands and have absolutely no access to the rest of the system. I figure chrooting is the way to solve this but I only know how to chroot a ...
5
votes
3answers
3k views

Official online RPM package browser / search for CentOS

I am looking for something that resembles packages.debian.org Debian Package Browser only for CentOS 5 and/or RHEL 5 [Red Hat Enterprise Linux].
5
votes
3answers
8k views

The difference between /etc/pam.d/login and /etc/pam.d/system-auth?

I want to configure securetty to limit root directly access. Now I am clear if I add: auth required pam_securetty.so into /etc/pam.d/system-auth, and keep only "console" in ...
5
votes
2answers
601 views

What does this Linux command do?

I have by a mistake written this command on a CentOS server xargs rpm -e|rpm -qa|grep test11 where I meant rpm -qa|grep test11|xargs rpm -e which should uninstall all packages matching "test11". ...
5
votes
4answers
4k views

How to fix the entropy pool issue with RHEL 5.x

RHEL 5.x has an entropy-generation problem (held-over from kernel 2.4). Following directions from here has produced little-to-no results: How to increase entropy pool on a 2.6 kernel RHEL/Fedora ...
5
votes
1answer
515 views

mount using insecure ports for nfs

Title says it. mount is occasionally making NFS mount/unmount requests from insecure ports. I believe the issue is being caused by all of the secure ports being stuck in TIME_WAIT after periods of ...
5
votes
3answers
986 views

Why is my MPIO connection to the SAN capped at 1 Gbps when using Linux?

I'm connecting a RHEL5 box to a Dell EqualLogic PS5000X and seeing a maximum of 1 Gbps even while using MPIO with three gigabit NICs. I have all three interfaces on the PS5000X and three dedicated ...
5
votes
3answers
1k views

setting up Ubuntu 10.10 as paravirtualized guest in Xen on RHEL5 host - what kernel?

I've discovered the tool ubuntu-vm-builder, which I've installed and then invoked on an Ubuntu workstation as: sudo vmbuilder xen ubuntu --suite maverick --flavour virtual --arch amd64 --mem=512 ...
4
votes
3answers
4k views

How to diagnose causes of oom-killer killing processes

I have a small virtual private server running CentOS and www/mail/db, which has recently had a couple of incidents where the web server and ssh became unresponsive. Looking at the logs, I saw that ...
4
votes
3answers
8k views

How to Update Red Hat Enterprise Linux 5.4 using CentOS Repos

I don't have a subscription for RHEL anymore and I want to update my server. Can anyone tell me How to Update Red Hat Enterprise Linux 5.4 using CentOS Repos ?
4
votes
3answers
446 views

Bash wonkyness on Ubuntu versus RHEL

Fellow faulters, I'm playing around with a one liner that I've developed on a RHEL 5.4 box and I have it working perfectly: TOTAL_RAM=`free | grep Mem: | awk '{ print $2 }'`; \ ps axo rss,comm,pid ...
4
votes
3answers
3k views

RHEL 5 Network Connectivity Issue

I just recently installed RHEL 5 on a virtual machine. The server is set up to use a static IP, which I've configured in the Network Configuration GUI. There is only ethernet interface set up called ...
4
votes
1answer
1k views

Online resize of large ext3 file system - is performance affected?

I am planning for a resize of a rather large file system hosting an Oracle instance (one of several on the same server). The disk is 4 TB striped over several LUNs, I'm increasing by 1 TB keeping the ...
4
votes
3answers
129 views

How to clear a disk entry from Linux

I have few Linux (RHEL 5.x / Centos 5.x) boxes running on KVMs, on which I used to attach and detach disks on the fly. Now the problem with EL5 versions are, when we add a disk, initially it will be ...
4
votes
1answer
1k views

Need to Migrate Xen DomU to VMWare ESXi - RHEL 5.3/ESXi 4.1

I've seen plenty of posts outlining the process of converting VMware Linux serves to RHEL Xen (not xenserver) but nothing much has helped me go the other way. I've tried a number of things including ...
4
votes
5answers
236 views

ssh keys + RHEL5

I've been able to set up SSH authentication keys on my ubuntu, fedora core and mac systems, however, I'm not able to get SSH keys to work properly with redhat enterprise linux 5 (RHEL5). I've tried ...
4
votes
1answer
87 views

How is “kernel.*” syslog spoofing prevented?

I'm finding instances of syslog-ng writing out garbage followed by a blank kernel.emerg line in one of our production environments. Example of one: Dec 21 00:14:56 someserver [syslog-ng.err] Error ...
4
votes
3answers
2k views

Easiest way to convert HVM DomU to PVM?

I've got a bunch of Xen 3.4 DomUs that are currently running as HVM because of our infrastructure (Kickstart which doesn't handle Xen PVM yet). Both DomU and Dom0 are RHEL5 machines. If I understand ...
3
votes
5answers
844 views

How can I move a process to a core or dedicate a process to a processor?

I have an Intel E5620 processor. I have used cat /proc/[pid]/stat to determine what processor the process was last run on (39th field). How can I ensure that a process is dedicated to a processor (I ...
3
votes
4answers
4k views

Override DHCP hostname on RHEL5/CentOS/Amazon Linux

I'm running Amazon Linux (based on RHEL5) on EC2. I have my own domain name pointing to the instance's elastic IP. Amazon auto-assigns the instance a generic (and not visible on the Internet) ...
3
votes
2answers
50 views

Finding home directory of all users

I'm a software dev suddenly finding myself having to play SysAdmin. Recently, I was given a box previously administered by somebody else, and this SysAdmin kind of just did what he wanted. My ...
3
votes
2answers
885 views

RHEL5: Can't create sparse file bigger than 256GB in tmpfs

/var/log/lastlog gets written to when you log in. The size of this file is based off of the largest UID in the system. The larger the maximum UID, the larger this file is. Thankfully it's a sparse ...
3
votes
2answers
408 views

setting up rhel 5.x RPM build server for mortal users

My task is to setup a RHEL 5.x build host, that can build RPMs for mortal users. On RHEL 6.x with rpm version 4.8, I have in /usr/lib/macros: # Path to top of build area. %_topdir ...
3
votes
3answers
6k views

Exclude a specific repo from YUM Update

I am doing a system wide yum update on RHEL 5.5 and the IUS EPEL repository is throwing a missing dependency error: php53-mcrypt-5.3.3-4.ius.el5.x86_64 from installed has depsolving problems --> ...
3
votes
2answers
11k views

How to install mcrypt on RHEL5

We have an RHEL5 server that I'm trying to install PHP-Mcrypt on and I'm stuck when I tried to run ./configure for mcrypt source files. I was using this guide: ...
3
votes
4answers
8k views

How to start / stop proftpd

I can't seem to find a way to stop / re-start proftpd. My server IP address is xx.yy.zz.ww and connecting from external devices via FTP gives me the prompt: Connected to xx.yy.zz.ww 220 ProFTPD ...
3
votes
1answer
2k views

Which RPM fixes this failed RedHat dependency?

Problem I'm installing an RPM on RedHat Enterprise Linux 5 and it fails with the following error: error: Failed dependencies: rpmlib(PayloadIsLzma) <= 4.4.6-1 is needed by vspd-1/43-rsmu.i586 ...
3
votes
2answers
34 views

Changing GRUB configuration to “single” not working in RHEL

I am using RHEL 5.10. I have mistakenly deleted /etc/passwd file in my server (though I have the backup). I'm just trying to get into single user mode by typing single at the end of the kernel line ...
3
votes
2answers
1k views

Can't ssh from Ubuntu to RHEL or CentOS

I am trying to setup publickey based authenitcation for 2 different boxes. One RHEL another on e is CentOS. I am having same issue with both where ssh fails and falls back to password based ...
3
votes
1answer
973 views

Getting OTRS to work with XAMPP

Setting up a testing environment on a RHEL5 server to test out OTRS ticketing system. I installed XAMPP for the ease of use factor for testing but can't seem to get the ticketing system to start with ...
3
votes
2answers
699 views

linux multipath - change device alias safely

I'm running RHEL 5.2 connected to a NetApp over FC. The server is running a database on mpathNN devices that can not be stopped. I need to add a new LUN and give it a specific alias (rather than ...
3
votes
1answer
2k views

Filezilla connection error

I have Red Hat Enterprise Linux (RHEL) 5 LAN server with Squid 2.6 stable proxy settings. Under this have some Windows XP desktops. Now I installed FileZilla FTP client in Windows XP, to service my ...
3
votes
1answer
339 views

How to monitor NFS load from userland?

Apologies if I'm not using the proper jargon (although I'm a longtime linux user, I'm not an admin) or if this is a FAQ (though searching SE got lots of hits, I didn't see anything quite like this ...
3
votes
2answers
1k views

Is there a way to disable the ptrace system call on RHEL5 Linux?

Is there any wat to disable the ptrace system call on RHEL5?
3
votes
3answers
2k views

How to chroot Apache on CentOS?

I have been advised by a sysadmin, to run Apache in a chroot jail, in order to prevent that an attacker could take control of server. So my question is: What is the best method to chroot ...
3
votes
2answers
1k views

RHEL5.5 yum can't see a package (xen) on repo?

hi i'm trying to install xen via yum on RHEL 5.5. When i browse the repo here: http://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/ I can see the package i want. specifically ...
3
votes
1answer
210 views

Is there a command like pstree for libraries?

I need to determine whether a library named libunaSA.so is being called directly by the process or by another library called libtoki2.so. I guess what I'm looking for is a pstree for libraries. The ...
3
votes
1answer
2k views

How to change device permissions via udev in RHEL5?

I'm attempting to make the device permissions on a hard drive(/dev/sdb) persistent for a particular group in RHEL5. Can anyone point me to to a proper KERNEL line in /etc/udev/rules that would work ...
3
votes
2answers
882 views

What is the best process to automate Zimbra deploy using cobbler+puppet?

I set up a fully working cobbler server on a RHEL5 machine. This is able to deploy a new server on bare metal machine, partitioning the disks, using LVM and creating as much virtual machines as I ...
2
votes
8answers
1k views

Accidentally rm -rf /usr/* as root, what now?

A colleague of mine accidentally deleted /usr/* data by running: rm -rf /usr/*. And it's now a big issue. We had a lot of good data on that machine. Most of the commands are not working as a result. ...
2
votes
8answers
2k views

cpu utilization over 100% in linux system

In one of our production Linux servers, CPU utilization is crossing 100 % and sometimes it is 250%. How can I find which process is using more CPU utilization and where can I find CPU utilization ...