Thursday, 14 July 2011

HACMP Scripts

 HACMP Scripts


The following scripts are supplied with the HACMP software.

Startup and Shutdown Scripts


Each of the following scripts is involved in starting and stopping the HACMP software.

/usr/es/sbin/cluster/utilities/clstart



The /usr/es/sbin/cluster/utilities/clstart script, which is called by the /usr/es/sbin/cluster/utilities/rc.cluster script, invokes the AIX System Resource Controller (SRC) facility to start the cluster daemons. The clstart script starts HACMP with the options currently specified on the Start Cluster Services SMIT panel.

There is a corresponding C-SPOC version of this script that starts cluster services on each cluster node. The /usr/es/sbin/cluster/sbin/cl_clstart script calls the HACMP clstart script.

At cluster startup, clstart looks for the file /etc/rc.shutdown. The system file /etc/rc.shutdown can be configured to run user specified commands during processing of the AIX /usr/sbin/shutdown command.

Newer versions of the AIX /usr/sbin/shutdown command automatically call HACMP's /usr/es/sbin/cluster/etc/rc.shutdown, and subsequently call the existing /etc/rc.shutdown (if it exists).

Older versions of the AIX /usr/sbin/shutdown command do not have this capability. In this case, HACMP manipulates the /etc/rc.shutdown script, so that both /usr/es/sbin/cluster/etc/rc.shutdown and the existing /etc/rc.shutdown (if it exists) are run. Since HACMP needs to stop cluster services before the shutdown command is run, on cluster startup, rc.cluster replaces any user supplied /etc/rc.shutdown file with the HACMP version. The user version is saved and is called by the HACMP version prior to its own processing. When cluster services are stopped, the clstop command restores the user's version of rc.shutdown.

/usr/es/sbin/cluster/utilities/clstop


The /usr/es/sbin/cluster/utilities/clstop script, which is called by the SMIT Stop Cluster Services panel, invokes the SRC facility to stop the cluster daemons with the options specified on the Stop Cluster Services panel.

There is a corresponding C-SPOC version of this script that stops cluster services on each cluster node. The /usr/es/sbin/cluster/sbin/cl_clstop script calls the HACMP clstop script.

Also see the notes on /etc/rc.shutdown in the section on clstart above for more information.

/usr/es/sbin/cluster/utilities/clexit.rc


If the SRC detects that the clstrmgr daemon has exited abnormally, it executes the /usr/es/sbin/cluster/utilities/clexit.rc script to halt the system. If the SRC detects that any other HACMP daemon has exited abnormally, it executes the clexit.rc script to stop these processes, but does not halt the node.

You can change the default behavior of the clexit.rc script by configuring the /usr/es/sbin/cluster/etc/hacmp.term file to be called when the HACMP cluster services terminate abnormally. You can customize the hacmp.term file so that HACMP will take actions specific to your installation. See the file for full information.

/usr/es/sbin/cluster/etc/rc.cluster


If the Start at system restart option is chosen on the Start Cluster Services SMIT panel, the /usr/es/sbin/cluster/etc/rc.cluster script is called by the /etc/inittab file to start HACMP. The /usr/es/sbin/cluster/etc/rc.cluster script does some necessary initialization and then calls the usr/es/sbin/cluster/utilities/clstart script to start HACMP.

The /usr/es/sbin/cluster/etc/rc.cluster script is also used to start the clinfo daemon on a client.

There is a corresponding C-SPOC version of this script that starts cluster services on each cluster node. The /usr/es/sbin/cluster/sbin/cl_rc.cluster script calls the HACMP rc.cluster script.

See the man page for rc.cluster for more information.

/etc/rc.net


The /etc/rc.net script is called by the /usr/es/sbin/cluster/etc/rc.cluster script to configure and start the TCP/IP interfaces and to set the required network options. The /etc/rc.net script is used in the boot process to retrieve interface information from the ODM and to configure all defined interfaces. If IP address takeover is configured, the /etc/rc.net script is called from the /usr/es/sbin/cluster/etc/rc.cluster script at cluster startup instead of during the boot process.  

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