sge_shadowd (8) - Linux Man Pages

sge_shadowd: xxQS_NAMExx shadow master daemon

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, and to start-up a new 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 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

xxQS_NAME_Sxx_ROOT
Specifies the location of the xxQS_NAMExx standard configuration files.
xxQS_NAME_Sxx_CELL
If set, specifies the default xxQS_NAMExx cell. To address a xxQS_NAMExx cell xxqs_name_sxx_shadowd uses (in order of precedence):

The name of the cell specified in the environment variable xxQS_NAME_Sxx_CELL, if it is set.

The name of the default cell, i.e. default.

xxQS_NAME_Sxx_DEBUG_LEVEL
If set, specifies that debug information should be written to stderr. In addition the level of detail in which debug information is generated is defined.
xxQS_NAME_Sxx_QMASTER_PORT
If set, specifies the TCP port on which is expected to listen for communication requests. Most installations will use a services map entry for the service "sge_qmaster" instead to define that port.
xxQS_NAME_Sxx_DELAY_TIME
This variable controls the time for 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 between xxqs_name_sxx_shadowd checks of the heartbeat file (60 seconds by default).
xxQS_NAME_Sxx_GET_ACTIVE_INTERVAL
This variable controls the interval between attempts by a xxqs_name_sxx_shadowd instance to take over when the heartbeat file has not changed. The default is 240 seconds.

FILES

<xxqs_name_sxx_root>/<cell>/common
                          Default configuration directory
<xxqs_name_sxx_root>/<cell>/common/shadow_masters
                          Shadow master hostname file.
<xxqs_name_sxx_root>/<cell>/spool/qmaster
                          Default master daemon spool directory
<xxqs_name_sxx_root>/<cell>/spool/qmaster/heartbeat
                          The heartbeat file.

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