Use of the ClusterShell

ClusterShell is an event-driven open source Python framework, designed to run local or distant commands in parallel on server farms or on large Linux clusters. We learned to use it by chance during a large HPC project with the team there and learned to like it.

ClusterShell can be used in a rudimentary way via the console command of the OSISM CLI. The Ansible inventory groups are available as node groups. These are automatically generated and updated by the inventory reconciler.

In this example, the command uname -v is executed on all nodes in the node group housing1047.

$ osism console --type clush housing1047
Enter 'quit' to leave this interactive mode
Working with nodes: com[1047-1050]
clush> uname -v
com1049: #38~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Thu Nov  2 18:01:13 UTC 2
com1050: #38~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Thu Nov  2 18:01:13 UTC 2
com1047: #38~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Thu Nov  2 18:01:13 UTC 2
com1048: #38~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Thu Nov  2 18:01:13 UTC 2
clush>