Starts the System Resource Controller.
srcmstr /usr/sbin/srcmstr [ -r ] [ -B ]
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.
| -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:
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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.
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.
| /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. |
The auditpr command, init command.
The System Resource Controller Overview in AIX Version 4.3 System Management Concepts: 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 Concepts: Operating System and Devices.