NAME

xxqs_name_sxx_shadowd - xxQS_NAMExx shadow master daemon

SYNOPSIS

xxqs_name_sxx_shadowd

DESCRIPTION

xxqs_name_sxx_shadowd is a "light weight" process which can be run on so-called shadow master hosts in a xxQS_NAMExx cluster to detect failure of the current xxQS_NAMExx master daemon, xxqs_name_sxx_qmaster(8), and to start-up a new xxqs_name_sxx_qmaster(8) on the host on which the xxqs_name_sxx_shadowd runs. If multiple shadow daemons are active in a cluster, they run a protocol which ensures that only one of them will start-up a new master daemon.

The hosts suitable for being used as shadow master hosts must have shared root read/write access to the directory $xxQS_NAME_Sxx_ROOT/$xxQS_NAME_Sxx_CELL/common as well as to the master daemon spool directory (by default $xxQS_NAME_Sxx_ROOT/$xxQS_NAME_Sxx_CELL/spool/qmaster). The names of the shadow master hosts need to be contained in the file $xxQS_NAME_Sxx_ROOT/$xQS_NAME_Sxx_CELL/common/shadow_masters.

RESTRICTIONS

xxqs_name_sxx_shadowd may only be started by root.

ENVIRONMENT VARIABLES

For a complete list of common environment variables used by all xxQS_NAMExx commands, see xxqs_name_sxx_intro(1).

xxQS_NAME_Sxx_DELAY_TIME
This variable controls the interval in which xxqs_name_sxx_shadowd pauses if a takeover bid fails. This value is used only when there are multiple xxqs_name_sxx_shadowd instances, and they are contending to be the master. The default is 600 seconds.

xxQS_NAME_Sxx_CHECK_INTERVAL
This variable controls the interval in which the xxqs_name_sxx_shadowd checks the heartbeat file (60 seconds by default).

xxQS_NAME_Sxx_GET_ACTIVE_INTERVAL
This variable controls the interval when a xxqs_name_sxx_shadowd instance tries to take over when the heartbeat file has not changed. The default is 240 seconds.

FILES

For a complete list of files used by all xxQS_NAMExx commands, see xxqs_name_sxx_intro(1).

<xxQS_NAME_Sxx_ROOT>/<xxQS_NAME_Sxx_CELL>/common

Default configuration directory

<xxQS_NAME_Sxx_ROOT>/<xxQS_NAME_Sxx_CELL>/common/shadow_masters

Shadow master hostname file.

<xxQS_NAME_Sxx_ROOT>/<xxQS_NAME_Sxx_CELL>/spool/qmaster

Default master daemon spool directory

<xxQS_NAME_Sxx_ROOT>/<xxQS_NAME_Sxx_CELL>/spool/qmaster/heartbeat

The heartbeat file.

COPYRIGHT

See xxqs_name_sxx_intro(1) for a full statement of rights and permissions.