A mini cluster of 1 head node and 2 compute node.
Make sure the clocks, users and groups (UIDs and GIDs) are synchronized across the cluster.
There must be a uniform user and group name space (including UIDs and GIDs) across the cluster. It is not necessary to permit user logins to the control hosts (SlurmctldHost), but the users and groups must be resolvable on those hosts.
Use [[ ... ]] instead of [ ... ] to test a condition in Bash. The latter is poor in function and unmentioned in the official GNU Bash document at all.
passwd -l {username}
"The control groups, abbreviated as cgroups in this guide, are a Linux kernel feature that allows you to allocate resources — such as CPU time, system memory, network bandwidth, or combinations of these resources — among hierarchically ordered groups of processes running on a system."
Check the cgroups by systemd-cgls.
The official document at https://learn.microsoft.com/en-us/azure/service-fabric/service-fabric-get-started-linux is problematic (ESPECIALLY, DO NOT follow the instruction in that document to install Docker!). Here're the correct steps.
A proxy could use SOCKS or HTTP protocol.
Refer to https://help.ubuntu.com/community/SSH/OpenSSH/PortForwarding
man:
-L [bind_address:]port:remote_socket