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Making Grid Engine Highly Available
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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)
