User accounts and access control 109
pstat
plis
Print a status summary of all loaded patches.
Print detailed information about a specific patch.
Note: The nortel user account is the designated user account for the execution of these CLI commands.
Patch retention
A patch is always retained until the poos CLI command explicitly puts the patch out of service.
Note: In some cases you cannot remove a patch (the poos CLI command fails).
Software exceptions
Linux kernel exceptions
If the Linux kernel encounters an unrecoverable error, it prints and logs a short description of the problem, and can produce an undefined result. Typical causes of such errors are unrecoverable hardware errors or bugs in the kernel software.
A nonfatal kernel exception is reported through a log in the kernel, and captured in the syslog. Kernel logs, due to invalid memory addresses, do not normally result in a kernel panic (crash); instead the process that triggers the fault terminates. These can produce a lasting negative impact on the system. It is recommended that such events be monitored in user space (using the syslog mechanism), and that a full system reboot be triggered after receipt of a kernel log report.
User accounts and access control
User accounts and access control methods are managed by native Linux user account management, and tools such as Radius and PAM. There is a diagnostic group and some default diagnostic users for debugging and maintenance purposes.
Linux base includes the following accounts:
•root (as Linux default)
Note 1: Logging in as root is strongly discouraged unless you are explicitly directed to do so. All of the base maintenance and debug actions must be performed using the nortel or sysadmin accounts.
Nortel Communication Server 1000
Linux Platform Base and Applications Installation and Commissioning
29 October 2008
