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27
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1answer
24k views

Is there still a use for irqbalance on modern hardware?

This question has been asked before, but I believe that the world has changed enough for it to be asked again. Does irqbalance have any use on today’s systems where we have NUMA-capable CPUs with ...
1
vote
1answer
69 views

Install Apache from Source or from Binary?

I work on a platform which serves several different projects. For the most part, all of the projects install their web server using Red Hat's RPM. We never created a policy for this which would ...
2
votes
4answers
1k views

Bring up a virtual interface without checking if it's up elsewhere

Is there a way to bring up a virtual interface without it first sending an arping to check if that IP address is already in use elsewhere? I'm working with a proprietary product that recommends ...
2
votes
2answers
547 views

ksappend does not work in RHEL/CO 6 any more?

I am currently in the progress of migrating our kickstart-files from CentOS 5 to CentOS 6. In CentOS 5 there was a nice anaconda/kickstart-statement that allowed the inclusion of other kickstart-...
2
votes
1answer
769 views

Is it possible to resize a mounted LVM partition on the fly?

Situation: We have a server that has a 40GB SAN (Fiber Channel) mounted as /opt/application. If the LUN is expanded to 60GB, what needs to be done to expand /opt/application on the RHEL-server to ...
1
vote
1answer
2k views

How to make sure RHEL will see multipath disks after a reboot?

We are using RHEL, but unfortunately there are issues with multipathing. It seems not all SAN disks are automatically seen after a reboot. A service multipath reload is required in order for the OS ...
2
votes
2answers
3k views

“Cannot fork: retry…” error in RH5. Need info on nproc

We had a server effectively go down this morning. SSH access cut out, and at least temporarily network access went down as well. We were able to log in using out-of-band access and were presented with ...
2
votes
1answer
551 views

varnishncsa does not show any output

I have varnsih setup on my RHEL6.x. While the varnish, varnishlog and varnishstats show proper data varnisncsa does not log any data even when run without any options defined. I have lsofed all the ...
2
votes
2answers
1k views

RedHat - yum install completion

I had been using Ubuntu and recently migrated to RedHat. The apt-get install auto completion is very handy, so I supposed yum install should have this function as well, but seemed it doesn't. Is there ...
2
votes
1answer
16k views

What is the difference between init 6 and reboot on Red Hat / RHEL / CentOS?

In Linux, the init 6 command gracefully reboots the system running all the K* shutdown scripts first, before rebooting. The reboot command does a very quick reboot. It doesn’t execute any kill ...
1
vote
2answers
312 views

How can you prompt for the EULA in Kickstart?

I am trying to modify a Kickstart script so that it does not auto-accept the EULA (which it seems to skip right now.)
0
votes
1answer
80 views

Replacing existing SSL cert on RHEL5/Apache2.2.3

My existing SSL cert is about to expire so I need to replace it with the new one. I have been provided a .cer and .key file. How can I smoothly replace the cert with minimal downtime?
1
vote
0answers
537 views

Spacewalk/Satellite Server - spacewalk-create-channel

I have a Spacewalk installation and I have mirrored the RHEL6 base repo on my server using mrepo. I created a channel using spacewalk-create-channel --user=me --server=localhost --version=6 \ --...
-1
votes
1answer
91 views

Cron and FTP daemons crashing randomly in RHEL

Not sure where to start in troubleshooting this. I'm not finding anything indicating an issue in ProFTP logs or in /var/log/messages. So I do apologize for not having more information to give. ...
-1
votes
2answers
280 views

su command works without prompting password

I'm on a RHEL server where the su command drops the user into root without prompting for a password. Obviously, this is a pretty big cause for concern which I'd like to fix. I'm not in contact with ...
0
votes
1answer
143 views

Is there a log to see when a user is trying to access file/directory that he doesn't have permission?

My database is failing to replicate and the only clue in the error log is Operation Not Permitted, which I am guessing is file access permission failure either on donar or joiner. Is there any file ...
3
votes
1answer
471 views

Specifying which network interface to use

Assuming multiple network interfaces (eth0, eth1...), how can I specify which one I would like to use?: Can I specify per-application which network interface should be used? Can I specify system-...
0
votes
1answer
5k views

Samba authentication of user with wbinfo -a

i setup a RedHat server with samba/kerberos/winbind. I can retrieve my user and groups with wbinfo -u and wbinfo -g. BUT in the listings, the name appears like that : wbinfo -u DOMAIN+username1 ...
-1
votes
2answers
71 views

Which python to use on Enterprise Linux? [closed]

I'm currently learning python and I recently bought a book that goes through Python 3. Where I work we use Red Hat Enterprise Linux, and I've noticed that on RHEL 5 and RHEL 6 the versions of python ...
2
votes
2answers
2k views

Checking yum connectivity from a script?

When there is a problem with access to yum repos (for example if a needed proxy isn't configured), running a command like 'yum update' will wait for a very long time trying lots of different mirrors. ...
0
votes
1answer
67 views

yum update if installed, otherwise install

Is there a command to do just that: if a package is already installed, update it, otherwise install the latest version For now I'm doing two commands: yum install mypackage yum update mypackage ...
1
vote
1answer
412 views

Apache forces Cache-Control: private automatically for HTTPS requests

I'm trying to get browsers to cache assets over HTTPS. I am using MD5 fingerprinting method to allow long-term caching and I have this part working OK. What doesn't work is setting the Cache-Control ...
1
vote
1answer
534 views

Enable multicast on dummy interface on startup

I have a dummy interface on a Centos 6.3 machine which I would like to use for multicast traffic. The problem is it does not come up with the MULTICAST option by default; I need to manually add it ...
1
vote
3answers
7k views

Virsh can't connect to ovirt hypervisor

I installed Ovirt and want to add network interface for NAT. So I need to connect to hypervisor by virsh and add nic. Ovirt installed on my local server, host (ovirt-engine.kvmserver.net) is on the ...
2
votes
1answer
175 views

High shmmax value in Redhat 6.3

We are using Redhat 6.3 with 30G RAM to host our Postgres server. The (default) shmmax value is 68,719,476,736 In some forums I have read that having an shmmax value larger than the RAM causes ...
0
votes
1answer
103 views

Why is RHEL 6.4 considered beta/pre-release software?

I'm new to RHEL and am installing 6.4 for the first time. The installer refers to it as "beta" and "pre-release" software. Why is that? When I downloaded it from the Red Hat website, nothing ...
1
vote
2answers
2k views

Why is raid-check using so little io bandwidth?

Just out of curiosity, we have a RHEL server running software RAID. There's a cronjob which kicks off a raid data check every so often to check the consistency of the array. From my understanding, the ...
0
votes
2answers
408 views

red hat enterprise 6.3 repository for yum via internet

I have installed a red hat enterprise 6.3 from scratch. The machine is surely connected to internet. When I do yum repolist I got 0. As far as I understood this happens because I didn't activated my ...
0
votes
1answer
585 views

Linux/RHEL Server Down with “xinetd” Alerts?

Suddenly one of my RHEL 6 Server [VM] (serving Apache on it also) went down and when i rebooted it, i saw several of following /var/log/messages as latest before it went down: May 4 08:16:37 ...
1
vote
1answer
487 views

How to relocate the database directory for Red Hat Directory Server 9.0

I am running RHDS in a VM, but would like to store the data and logs on a separate volume, that is on a SAN. The partition is ext4fs on /sdb1 and is mounted as /data. I tried many variations of the ...
1
vote
0answers
344 views

Cobbler import of RHEL6 DVD doesn't seem to create yum repo

I setup cobbler (2.4.0) and imported the RHEL6.4 DVD. It copies all of the packages over to /var/www/cobbler/ks_mirror/RHEL6.4-x86_64. It even runs createrepo and loads the metadata, etc. So you ...
-1
votes
1answer
108 views

SElinux policy to grant read access to /etc/my.cnf for httpd

How can I modify the SElinux policy to allow httpd to read /etc/my.cnf? Background: My web application connects to a mysql database. Instead of hardcoding the credentials in the code, they are stored ...
0
votes
2answers
652 views

How to secure channels created with spacewalk-create-channel?

Does spacewalk-create-channel (RHN Satellite) create channels without security updates? spacewalk-create-channel --user=username --password=password -v 5 -r Server -u U7 -a i386 --destChannel=rhel-...
0
votes
1answer
47 views

Redhat OS upgrade and kernel revision

Is it OK to run RedHat 5.8 off the RedHat 5.9 kernel (version 348) ? This automatically happened when I updated my OS. Do I need to change it back to the correct kernel version in my /etc/grub.conf ...
2
votes
1answer
498 views

Unable to connect to Internet in OEL5 guest even though I can ping machine from host machine

I have Oracle Enterprise Linux 5 as Guest on VirtualBox running on Windows 7 host using Bridged Network. I have being trying to configure a static IP on OEL5 VM Guest at work, as previously the VMs ...
0
votes
1answer
172 views

How to find back gnome-terminals (SSH sessions) in GNOME?

I often have tens of gnome-terminals opened when I am working at my CentOS Desktop (Virtual Machine). This can mean I have about 40 open SSH sessions to different servers. What is the best way to ...
2
votes
1answer
124 views

Setting up CentOS/RHEL virtual on VirtualBox

I have a physical server running Red Hat Enterprise Linux Server release 5.5 (Tikanga). I would like to create a virtual machine (using VirtualBox) with a binary-compatible version of CentOS server as ...
1
vote
2answers
1k views

RHEL 6.4 custom dvd boot issue

I'm creating a custom RHEL 6.4 iso to save myself time while rebuilding standalone hosts. Before I customize the menus and add the extra kickstart files in I have tried a simple unpack -> repack to ...
2
votes
2answers
404 views

VMWare ESXi: to extend a partition or create a new drive?

Is it better to extend an existing partition or to create a new drive in a VMWare ESXi virtual machine? I'll be using LVM to put the drive in an existing volume group on my VM and to extend a SAN ...
1
vote
1answer
207 views

Red-Hat Cluster failover notification?

Is there anyway to get a notification / setup a notification mechanizem when the cluster fails over?
0
votes
2answers
754 views

Disk status on Dell Powervault 1200 attached storage?

I have a RHEL box with direct attached storage (Dell Powervault 1200) containing 10 disks in RAID 10. There are two logical volumes set up on the server. I am wondering how to determine the health ...
2
votes
1answer
2k views

postgres updated from 9.1 to 9.2, required database update fails

On going from postgres 9.1 to 9.2, it says that the data bases need to be upgraded so on giving the upgrade command I give and get the following $ sudo service postgresql upgrade Stopping postgresql ...
1
vote
2answers
1k views

Start services after network is ready on Red Hat

On Ubuntu, to configure a service to start after network is up, you can put a script in your /etc/network/if-up.d/ #!/bin/sh /etc/init.d/<your service> restart or something like suggested in ...
1
vote
0answers
84 views

multipath -l vs -ll

What system information is multipath -ll reading that multipath -l does not? From the RHEL DM Multipath Guide -l Display the current multipath configuration gathered from sysfs and the device ...
0
votes
1answer
874 views

Is it possible to create a RHEL 5.7 channel based on updated (5.9) RHEL channels in Satellite?

I would however like to kickstart new servers based on RHEL 5.7. Both official Red Hat channels in Satellite are already updated to RHEL 5.9 and RHEL 6.4 though. Red Hat Enterprise Linux (v. 5 for 64-...
0
votes
1answer
236 views

Why does Satellite need a kickstartable distribution for cloned channels, but not on the official main Red Hat Channel?

I have been using Satellite for a while now and I am able to kickstart machines directly from the official main RH channels Red Hat Enterprise Linux (v. 5 for 64-bit x86_64) Red Hat Enterprise Linux ...
1
vote
1answer
3k views

What to do with subscription-manager in a Red Hat Network Satellite environment?

Yum commands all give the following error message: Unable to read consumer identity It seems however that subscription-manager plugin should be disabled if I use RHN/Satellite? What to do after ...
0
votes
2answers
122 views

Our Red Hat Enterprise 5 Server is swapping itself to death - need a plan for detecting the cause

At seemingly random intervals, the memory usage on our server is increasing over the maximum available and swapping until the CPU usage is also 100%. It then starts killing off processes when it runs ...
2
votes
0answers
24 views

Updating RHEL 5.6 (without moving to ≥ 5.7) [duplicate]

I have a fresh install of RHEL 5.6 and I wanted to apply as many updates as possible without changing the main version to ≥ 5.7 (as I will be installing software on top of RHEL that requires 5.4-5.6). ...
1
vote
0answers
159 views

Xvfb on RHEL6 - can't find the package

This looks like an already discussed subject, but, I can't find any solution for it, so, I gonna try it again. I look some questions and try all the given solutions, with no success. I tried to ...