System Default Users

The following table lists system users with /sbin/nologin.

These users are not intended for logging in.
None of these users has a password set by default.
Critical system users cannot be deleted.
Warning
Deleting critical system users may result in service disruption.

User	Purpose	Can be deleted?
`dbus`	Runs D-Bus, a message bus system that provides inter-process communication for system services like hardware abstraction.	No
`polkitd`	Runs `polkit` (former PolicyKit), a tool for privilege escalation in system services.	No
`sshd`	Runs OpenSSH server (`sshd`) securely in a restricted environment.	No
`rpc`	Runs the `rpcbind` daemon that manages Remote Procedure Call (RPC) services, used in NFS and other RPC-based systems.	No
`pcp`	Runs Performance Co-Pilot (PCP), a system performance monitoring tool.	Yes Note PCP is not used and will be removed in a later release of VAST OS.
`chrony`	Runs `chrony`, a time synchronization daemon (an alternative to `ntp`).	No
`rngd`	Runs the random number generator daemon (`rngd`) which improves entropy for cryptographic operations.	No
`nobody`	Generic unprivileged user that is used by various services when they need to drop privileges to minimize security risks.	No
`systemd-coredump`	Runs `systemd` core dumper that handles core dumps for debugging application crashes.	Yes Note Core dumping is disabled.