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SGE_SHADOWD(8) Sun Grid Engine Administrative Commands SGE_SHADOWD(8)
NAME
sge_shadowd - Sun Grid Engine shadow master daemon
SYNOPSIS
sge_shadowd
DESCRIPTION
sge_shadowd is a "light weight" process which can be run on so-called shadow master hosts in a Sun Grid Engine cluster to detect failure of
the current Sun Grid Engine master daemon, sge_qmaster(8), and to start-up a new sge_qmaster(8) on the host on which the sge_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 dae-
mon.
The hosts suitable for being used as shadow master hosts must have shared root read/write access to the directory $SGE_ROOT/$SGE_CELL/com-
mon as well as to the master daemon spool directory (by default $SGE_ROOT/$SGE_CELL/spool/qmaster). The names of the shadow master hosts
need to be contained in the file $SGE_ROOT/$xQS_NAME_Sxx_CELL/common/shadow_masters.
RESTRICTIONS
sge_shadowd may only be started by root.
ENVIRONMENT VARIABLES
SGE_ROOT Specifies the location of the Sun Grid Engine standard configuration files.
SGE_CELL If set, specifies the default Sun Grid Engine cell. To address a Sun Grid Engine cell sge_shadowd uses (in the order of
precedence):
The name of the cell specified in the environment variable SGE_CELL, if it is set.
The name of the default cell, i.e. default.
SGE_DEBUG_LEVEL
If set, specifies that debug information should be written to stderr. In addition the level of detail in which debug infor-
mation is generated is defined.
SGE_QMASTER_PORT
If set, specifies the tcp port on which sge_qmaster(8) 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.
SGE_DELAY_TIME This variable controls the interval in which sge_shadowd pauses if a takeover bid fails. This value is used only when there
are multiple sge_shadowd instances and they are contending to be the master. The default is 600 seconds.
SGE_CHECK_INTERVAL
This variable controls the interval in which the sge_shadowd checks the heartbeat file (60 seconds by default).
SGE_GET_ACTIVE_INTERVAL
This variable controls the interval when a sge_shadowd instance tries to take over when the heartbeat file has not changed.
FILES
<sge_root>/<cell>/common
Default configuration directory
<sge_root>/<cell>/common/shadow_masters
Shadow master hostname file.
<sge_root>/<cell>/spool/qmaster
Default master daemon spool directory
<sge_root>/<cell>/spool/qmaster/heartbeat
The heartbeat file.
SEE ALSO
sge_intro(1), sge_conf(5), sge_qmaster(8), Sun Grid Engine Installation and Administration Guide.
COPYRIGHT
See sge_intro(1) for a full statement of rights and permissions.
SGE 6.2u5 $Date$ SGE_SHADOWD(8)