This project is presently hosted at hacron.dev.java.net. I shall follow the steps to host it as an OpenSolaris project as soon as possible.
Thanks guys! :) On Mon, Jan 12, 2009 at 9:04 PM, Thorsten Frueauf <Thorsten.Frueauf at sun.com>wrote: > Hi Lalith et al, > > see my comments inline: > > Lalith Suresh wrote: > >> Hi everyone, >> >> I've been developing HA-Cron using the GDS template and I've completed the >> start(), stop(), probe(), validate() and validate_options() commands so far. >> I've tested these individual scripts as per mentioned the 'SC Agent >> development: Advanced GDS Methodology' workshop slides, and they all seem to >> be working fine. I'm not using SMF for the above mentioned scripts, I've >> tested them and they work properly regardless of whether or not 'cron' is >> shown as 'disabled' in SMF. >> >> My next step would be to make sure to wrap up this application for >> non-global zones right? So here are my doubts: >> >> 1) Since I've decided not to use SMF here, I'll need only to use the zsh >> component right? >> > > There might be some confusion about why the GDS template also provides > hooks to use the sczsmf component. It only does this so that one can code an > agent that is HA Container agent aware. This was specifically usefull for > Sun Cluster 3.1, where the cluster framework was not available within > non-global zones. > > It is not a requirement to do this. > > Instead, the agent you coded can be used when non-global zones are used as > virtual cluster nodes (ie. they can host a resource group (RG) and are > mentioned as <nodename>:<zonename> within the Nodelist property of the RG). > This possibility came with Solaris Cluster 3.2 and newer. > > In that sense you do not even need to use the zsh component - unless you > want to code your agent HA Container agent aware. > > Only a small subset of our standard agents do this, see > > http://opensolaris.org/os/community/ha-clusters/ohac/Documentation/Agents/overviewGDSagents/ > > 2) I've noticed that no other agent listed in >> http://src.opensolaris.org/source/xref/ohac/ohacds/usr/src/cmd/ha-services/gds-agents/, >> is using the zone-sh component ( local_zone_zsh() ) function (the search >> results suggested that) and they all seem to be using only the zone-smf >> component ( local_zone_smf() ) to get the application to run in the >> non-global zone. Any particular reason for this? >> > > Yes, it relates to what I explained at 1). The HA Container agent was > invented with Sun Cluster 3.1 - where the cluster framework was not > available within non-global zones. We have choosen to use SMF in the > combination of the HA Container agent in order to have a similar > functionality that PMF is offering - a probe from inside (the optional Probe > command) and outside (through the process contract monitioring done by SMF). > More details about those design decisions can be read at > > http://opensolaris.org/os/community/ha-clusters/ohac/Documentation/Technical-Presentations/HowToWrapApplicationsIntoZones.pdf > > 3) In the GDS-template, the first few lines in local_zone_zsh() are as >> follows: >> >> if [ ! -f ${SMFUTILDIR}/sczsmf_config ] >> then >> echo ${SMFUTILDIR}/sczsmf_config does not exist. Make sure, that \ >> Sun Cluster HA for Solaris container is intalled in the >> global zone >> return 1 >> fi >> >> Shouldn't this be: >> >> if [ ! -f ${ZSHUTILDIR}/sczsh_config ] >> then >> echo ${ZSHUTILDIR}/sczsh_config does not exist. Make sure, that \ >> Sun Cluster HA for Solaris container is intalled in the >> global zone >> return 1 >> fi >> >> > Thanks for reporting. I can fix this along with some other changes found by > someone else. Will send out a code review in the next days hopefully. > > 4) As far as making an agent for Cron is concerned, do you think I should >> be using SMF as well? >> > > I have not yet found time to read your proposal on how to implement the > cron agent. > > If you do not explicitly want to make your agent HA Container agent aware, > I would recommend to not use sczsmf or sczsh. > > In fact, if you think about it - if you have a crontab within a failover > zone, the cron job will always move along with the zone. So in that case I > see limited value of an HA cron agent. > > Btw. do you plan to create an OpenSolaris project for this agent? You could > host the documentation/design/proof of concept code/etc on it. > The required steps are documented at > > http://opensolaris.org/os/community/ha-clusters/ohac/contribute/OHACDevProcess/ > > Please help me out. And sorry in advance if any of the questions are too >> noobish :) >> > > They are not - thanks for contributing! > > Greets > Thorsten > -- > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > Sitz der Gesellschaft: > Sun Microsystems GmbH, Sonnenallee 1, D-85551 Kirchheim-Heimstetten > Amtsgericht Muenchen: HRB 161028 > Geschaeftsfuehrer: Thomas Schroeder, Wolfgang Engels, Dr. Roland Boemer > Vorsitzender des Aufsichtsrates: Martin Haering > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > -- Lalith Suresh Department of Computer Engineering Malaviya National Institute of Technology, Jaipur +91-9982190365 , lalithsuresh.wordpress.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.opensolaris.org/pipermail/ha-clusters-discuss/attachments/20090112/74b5c86f/attachment.html>
