md5sum differences on identical systems
- Mar
- 20
- Posted by TKH Specialist
- Posted in Analysis, Troubleshooting
In troubleshooting a problem a colleague noticed that there were md5sum differences in the files of identical systems: ServerOne # md5sum /lib64/libc-2.12.so 27a605fdeaf7c835493a098213c9eec1 /lib64/libc-2.12.so ServerTwo # md5sum /lib64/libc-2.12.so 13e3eb598abd09279efc05e215e77ae2 /lib64/libc-2.12.s Analyzing a hex dump of the .so files showed cyclical differences at matching locations. This is where I began helping to look at the problem. […]
read moreYum Rollbacks
- Dec
- 21
- Posted by TKH Specialist
- Posted in System Administration
Very occasionally installing a package or updates with yum can have unexpected results. Fortunately yum provides the ability to roll back anything it installs. Here is an example of what these commands look like: # yum history Loaded plugins: package_upload, product-id, search-disabled-repos, security, subscription-manager ID | Login user | Date and time | Action(s) | […]
read moreyum 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 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 […]
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