srcmstr Daemon

AIX Version 4.3 Commands Reference, Volume 5

srcmstr Daemon

Purpose

Starts the System Resource Controller.

Syntax

srcmstr /usr/sbin/srcmstr [ -r ] [ -B ]

Description

The srcmstr daemon is the System Resource Controller (SRC). The srcmstr daemon spawns and controls subsystems, handles short subsystem status requests, passes requests on to a subsystem, and handles error notification.

The srcmstr daemon is normally started by using an inittab file entry.

Flags

-r

Accepts remote requests if the daemon is started with the -r flag. If you start srcmstr without the -r flag, remote requests are ignored.

-B

Specifies the -B flag that causes the srcmstr daemon to run as in previous releases (AIX 4.3.1 and earlier).

Notes:

The srcmstr daemon is typically started from inittab. To add the -r or -B flags, edit /etc/inittab and run init q or reboot.
The user must be running as root on the remote system. The local /etc/hosts.equiv file or the /.rhosts file must be configured to allow remote requests.

Security

Auditing Events: If the auditing subsystem has been properly configured and is enabled, the srcmstr command will generate the following audit record (event) every time the command is executed:

Event	Information
SRC_Start	Lists in an audit log the name of the subsystems being started.
SRC_Stop	Lists in an audit log the name of the subsystems being stopped.

See "Setting Up Auditing" in AIX Version 4.3 System Management Guide: Operating System and Devices for more details about how to properly select and group audit events, and how to configure audit event data collection.

Error Recovery

The default /etc/inittab specifies the respawn flag for the srcmstr daemon. If the srcmstr daemon terminates abnormally and the /etc/inittab specifies the respawn flag, the srcmstr daemon is restarted. It then determines which SRC subsystems were active during the previous invocation. The daemon re-establishes communication with these subsystems (if it existed previously), and initializes a private kernel extension and the srcd daemon to monitor the subsystem processes.

If a subsystem known to the previous invocation of srcmstr terminates, the SRC kernel extension notifies the srcd daemon. The srcd daemon sends a socket message to srcmstr and subsystem termination is handled as if the subsystem had been started by the current srcmstr. This function can be disabled by specifying the -B flag when the srcmstr daemon is started. The SRC kernel extension is in /usr/lib/drivers/SRC_kex.ext. The executable for srcd is /usr/sbin/srcd.

Files

/etc/inittab	Specifies stanzas read by the init command.
/etc/objrepos/SRCsubsys	Specifies the SRC Subsystem Configuration Object Class.
/etc/objrepos/SRCnotify	Specifies the SRC Notify Method Object Class.
/etc/hosts.equiv	Specifies that no remote requests will work if the specified host name is not in the /etc/hosts.equiv file.
/etc/services	Defines the sockets and protocols used for Internet services.
/dev/SRC	Specifies the AF_UNIX socket file.
/dev/.SRC-unix	Specifies the location for temporary socket files.
/dev/.SRC-unix/SRCD	Specifies the AF_UNIX socket file for the srcd daemon.
/var/adm/SRC/active_list	Contains a list of active subsystems. Caution: The structure of this file is internal to SRC and is subject to change.
/var/adm/SRC/watch_list	Contains a list of subsystem processes active during the previous invocation of the srcmstr daemon. Caution: The structure of this file is internal to SRC and is subject to change.
/.rhosts	Specifies remote machines and users (root only) that are allowed to request SRC function from this machine.

Related Information

The auditpr command, init command.

The System Resource Controller Overview in AIX Version 4.3 System Management Guide: Operating System and Devices gives an explanation of subsystems, subservers, and the System Resource Controller.

The Auditing Overview in AIX Version 4.3 System Management Guide: Operating System and Devices.