LDM RHEL Binary RPM, spec & ldmd init script

[Gerry Creager]

I'm much more inclined to create a script to perform the simple steps to 
compile, than to spend a couple of hours (at least, that's what it takes 
me) to package an RPM that will not be necessarily correct for all 
systems.  I do, however, agree that a service start/stop script is 
useful.  That said, I add a couple of lines in the /etc/rc.d/rc.local 
file to:
cat the contents of ~ldmd.pid
Remove that file
perform, as ldm, an ldmadmin start
trap an error
remake the queue if necessary
start ldm

That could be modified or cleaned up, but it works on all my LDM systems...

gerry

Art Wildman wrote:
> 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 at JAX
> 

-- 
Gerry Creager -- gerry.creager at tamu.edu
Texas Mesonet -- AATLT, Texas A&M University	
Cell: 979.229.5301 Office: 979.458.4020  FAX 979.862.3983
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