yum Invalid System Credential error
- Sep
- 30
- Posted by TKH Specialist
- Posted in redhat, rhel 6, rhel 7, Satellite, System Administration
I ran across the following yum error after migrating a system from being a client of Satellite 5.6 to Satellite 6.1. First here is the error: # yum update Loaded plugins: package_upload, priorities, rhnplugin, search-disabled-repos, security, subscription-manager There was an error communicating with RHN. RHN Satellite or RHN Classic support will be disabled. Error Message: […]
read moreWorking with Repositories
- Sep
- 29
- Posted by TKH Specialist
- Posted in redhat, System Administration
Pulling packages from multiple sources can lead to problems. If you are running rhel and have epel enabled an update could inadvertently pull down a newer version from the wrong repository. This doesn’t always cause a problem, but it can. If you need to tfind all the epel packages on your system, here is how […]
read moreDon’t Panic Kernel!
- May
- 17
- Posted by TKH Specialist
- Posted in redhat, System Administration
You do your best to keep your systems running, but eventually something is going to happen (read you are going to do something) that leads to a Kernel Panic. Every System Administrator fears a Kernel Panic at some point in their career, but it is never a good idea to panic over one! Here are […]
read moreTo reboot or not to reboot?
- Jun
- 10
- Posted by TKH Specialist
- Posted in redhat, System Administration
You have patches to apply, we all know that if there are kernel patches that you need to (or at least should) restart/reboot the server. But what about other packages? There are a few non-kernel patches which can cause havoc if you spply them and do not reboot the server. The biggest package that most […]
read more6GB free = 100% disk usage?!
- May
- 15
- Posted by TKH Specialist
- Posted in LVM, redhat, System Administration
What to do when you have plenty of available disk space but the system is telling you the disk is full?! I was working on a server migration, moving 94GB of user files from the old server to the new server. Since we aren’t planning on seeing a lot of growth on the new server, […]
read moreOCI on RHEL6
- Mar
- 31
- Posted by TKH Specialist
- Posted in redhat
Our developers had to have OCI. Now that I got that out of the way. 😉 We use Oracle as our DB for most applications (calm down, like you couldn’t have figured that out). In setting up a new application server for a custom application it came to my attention that the application used oci […]
read morePain often equals Progress
- Nov
- 07
- Posted by TKH Specialist
- Posted in redhat, System Administration, Tools
It has been one of those weeks. Not fun, to many hours worked, personal events missed, you know the kind of week I am talking about. If not…what do you do for a living?! Despite all the pain and stress this week has resulted in Progress, an increased understanding of certain products and new ways […]
read moreThe Root of Missing Mail
- Apr
- 30
- Posted by TKH Specialist
- Posted in redhat, System Administration
Like all conscientious system administrator I like to keep tabs on my servers. One way of doing this is checking root’s email daily. This is a great idea if you have a few servers and never take vacation! I manage close to 100 servers, so I need a more efficient way of “hearing” my servers […]
read moreYum that was useful!
- Aug
- 09
- Posted by TKH Specialist
- Posted in redhat
Pardon the humor. Just a collection of useful yum commands that are useful to have around but I don’t always remember off the top of my head. I’ll be adding to this post over time. How to list the files installed by a yum package You will need ‘repoquery‘ which is part of ‘yum-utils‘. If […]
read moreFlush This!
- Aug
- 06
- Posted by TKH Specialist
- Posted in redhat, System Administration
- 1
I came across this today and learned something new so thought I would share it here. After killing 2 processes that had hung I noticed the following in the ps output: root 373 2 0 Jun11 ? 00:00:00 [kdmflush] root 375 2 0 Jun11 ? 00:00:00 [kdmflush] root 863 2 0 Jun11 ? 00:00:00 [kdmflush] […]
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