Hi folks,
1. Looking for an LDM RHEL-4+ RPM binary or rpm.spec files? If not, I
may be interested in building one for i386 (advice welcome).
2. Does anyone have a ldmd init script for RHEL that can support some of
the advanced RH Linux features listed below (chkconfig, service, PID
files & locks).
3. Are there any other gotchas (like syslog) running LDM at Boot as a
service?
I was following the linux-HA Cluster thread & noticed there are some LDM
Docs referencing clusters, but most are geared toward Hi-Performance
Clusters, not Hi-Availability (HA) Clusters. Some configs & principles
(IP Virtual Server) may translate though. For HA clusters, LDM can be
started & stopped via init-scripts in /etc/rc.d/init.d or
/etc/ha.d/haresources as Richard noted.
ConfiguringHeartbeat - Linux HA
http://www.linux-ha.org/ConfiguringHeartbeat
LDM Clusters
http://www.unidata.ucar.edu/software/ldm/ldm-6.6.4/basics/cluster.html
LDM at Boot - Init Scripts (this should be included in the
ldm-binary.rpm specific to RHELvX)
http://www.unidata.ucar.edu/software/ldm/ldm-6.6.4/basics/configuring.html#boot
http://www.unidata.ucar.edu/software/ldm/ldm-6.6.4/ldmConfigInstallList.html
ftp://ftp.unidata.ucar.edu/pub/ldm/scripts/linux/ldmd
Comparing it to a simple init script like /etc/rc.d/init.d/atd & we may
be able to improve it some & use RHEL service commands, locks & pstools
(pgrep, pkill...) to manage the service like:
# chkconfig --level 345 ldmd on
# service ldmd restart
# service ldmd status
# head /etc/rc.d/init.d/atd | grep chkconfig
# chkconfig: 345 95 5
Note: the chkconfig: line determines runlevels & the priority of kill
and start scripts (man chkconfig)
# service crond status
crond (pid 1117) is running...
# cat /var/run/crond.pid
1117
# ls -l /var/lock/subsys/crond
-rw-r--r-- 1 root root 0 Jan 5 17:26
/var/lock/subsys/crond
This may help shutdown & restart the ldmd safely during failover in an
HA cluster.
-Art@JAX
