The StAB cluster subscribes to Red Hat, and uses version 6, which is one behind the latest version, version 7.
Being one version behind is typicaly not a problem, as it continues to be fully supported. However, there are software packages that like to use the bleeding edge, and there are admitted problems installing these programs.
Installation of devtoolset-2
There are two ways apparently via RHN Classic or RH Subscription Management, and we choose the latter because there is a useful command-line tool for it.
To install on a node:
ssh node4 'subscription-manager subscribe --pool=8a85f9814ed67b98014eda13ed983c7d'
Note here that we have previously been able to verify the pool ID. Documentation for this can be found at
This will also enable the appropriate repos for you (though *-source-rpms and *-debug-rpms may be left out).
outdated repomd.xml warnings
You can get rid of them (i.e. update the repomd.xml) by:
yum clean all yum update yum*
PYCURL error 7
Note that this could easily occur is the squid server on marvin has failed. Make sure you at least try and restart the squid server on marvin.
This link has a fairly exhaustive for checking errors using tcpdump and nc.
RedHat service types
- A service is usually under one or more of these.
- Some of them are a little old.
- it's probably best to use subscription manager.
The wiki entry on problems with node1 can also be helpful: node 1 issues
ssl connection errors
So the nodes are connected to the internet via the squid proxy service running on marvin. The relevant IP and port numbers are
This has always worked quite well since 2016 when it was installed. And the big September 2017 update went through without a hitch. However in Novmber 2017, it started failing with SLL connection errors. Not to EPEL or anything, but to
A longish, but somwhat raw troubleshooting page from Red Hat is up at this link.
Considering upgrading to RHEL7
A link for this is solution number 637583
- This could be one heck of an epic upgrade, especially as regards the manually installed software programs (150 or them, some of them very big)
- Most likely it will be the different C library that will cause problems
- Library and linking problems are big ... fear them!
Test with node10
Following solution 637583, we install the upgrade assessemnt software and and run
which, happily enough, will not install the upgrade but report on what problems are likely to be encountered.
Note, that it takes a while to run, may be 30 mins.