On my install of Rocks 5.5 running CentOS 5.8, there was no working 'screen' command. You need 'screen'. Really. Following the few threads out there I became mired in the exasperating process of adding a yum repository to Rocks. Don't be like me, don't follow the instructions at:
http://central6.rocksclusters.org/roll-documentation/base/6.1/update.html
This particular problem is much easier to solve. The repo is already there, just not enabled.
Solution:
1. Determine which repositories, already installed on your cluster, are enabled:
yum repolist all
For me, the only enabled repository was Rocks-5.5. 'Screen' is not found there, so that when you run:
yum install screen
you get:
Setting up Install Process
No package screen available.
Nothing to do
2. Enable the CentOS base repository:
cd /etc/yum.repos.d
cat CentOS-Base.repo
note that:
...
[base]
enabled = 0
...
change that:
cp CentOS-Base.repo CentOS-Base.repo.old #preserve the initial file
perl -0pe 's/\[base\]\nenabled = 0/\[base\]\nenabled = 1/' CentOS-Base.repo > CentOS-Base.repo.new
cat CentOS-Base.repo.new
note that now:
...
[base]
enabled = 1
...
rename new file to original file name:
mv CentOS-Base.repo.new CentOS-Base.repo
3. Verify that CentOS base repository is now enabled:
yum repolist all
4. Proceed with normal installation process using yum:
yum install screen
...hooray, screen.
