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 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 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 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 morememcached
- Apr
- 12
- Posted by TKH Specialist
- Posted in Kuali, redhat, tomcat
In support of the Kuali project. Setting up true fail over for the Kuali application servers. Currently if a node went down, the user would need to re-authenticate. The following procedure configures the system so it can lose a node and the users on that node will not lose their session. My part on the […]
read moreExtended ACLs
- Mar
- 19
- Posted by TKH Specialist
- Posted in redhat
To remove permanently ACL from a file: # setfacl -bn file.txt To remove permanently ACL from an entire directory: # setfacl -b –remove-all directory.name To overwrite permissions, setting them to rw for files and rwx for dirs $ find . ( -type f -exec setfacl -m g:mygroup:rw ‘{}’ ‘;’ ) -o ( -type d -exec […]
read moreX11 error on login to RedHat Servers
- Dec
- 21
- Posted by TKH Specialist
- Posted in redhat
I noticed that since the last set of patches many of my redhat 6 systems are reporting an X11 forwarding error after login: X11 forwarding request failed on channel 0 To correct this problem you need to install the following package yum install xorg-x11-xauth I have not had the time to investigate why this is […]
read moreRecent Comments
- Stefan on Flush This!
- Timestamping your Bash History | Matt's Entropy on Remember when you issued that command…?
- Matt Smith on Remember when you issued that command…?
- Ruan on Putting ‘lsof’ to use
- Dylan F. Marquis on External Mapping of LDAP attributes in CAS