That design looks quite nice. That should scale and be very fast. Thanks!
From: Xiao Peng Wang [mailto:[email protected]] Sent: Tuesday, December 11, 2012 9:30 PM To: xCAT Users Mailing list Cc: xCAT Users Mailing list Subject: Re: [xcat-user] xCAT db access from postscripts Technically, using the 'curl' or 'rest api' to get attributes for a node is fine, but it will affect the deployment performance for bunch of nodes since xcatd needs to handle the request for every nodes. Recently, xCAT added a new feature that customer could define that which attributes should be exported to the node for running of the postscript. Refer to the following doc: http://sourceforge.net/apps/mediawiki/xcat/index.php?title=Updatenode_Performance_Enhancements#Add_a_Template_for_mypostscript Thanks Best Regards ---------------------------------------------------------------------- Wang Xiaopeng (王晓朋) IBM China System Technology Laboratory Tel: 86-10-82453455 Email: [email protected]<mailto:[email protected]> Address: 28,ZhongGuanCun Software Park,No.8 Dong Bei Wang West Road, Haidian District Beijing P.R.China 100193 [Inactive hide details for "Pocina, Goran" ---2012/12/12 06:10:30---See questions at end... For RH & CentOS builds, a profile's]"Pocina, Goran" ---2012/12/12 06:10:30---See questions at end... For RH & CentOS builds, a profile's kickstart template goes through macro pr From: "Pocina, Goran" <[email protected]<mailto:[email protected]>> To: xCAT Users Mailing list <[email protected]<mailto:[email protected]>>, Date: 2012/12/12 06:10 Subject: [xcat-user] xCAT db access from postscripts ________________________________ See questions at end… For RH & CentOS builds, a profile’s kickstart template goes through macro processing that allows it to access xCAT attribute values. For a long time it bugged me that postscripts don’t go through the same macro processing, until a colleague pointed out that it should be possible for postscripts to use curl to pull any attributes they need during the install. Very nice xCAT feature!! Here’s one possible postscript that could be called by other postscripts to load a node’s attributes into the current shell environment: /install/postscripts/getnodeattr: ATTRF=/var/log/xcat/attr.$NODE mkdir �Cp $(dirname $ATTRF) if [ ! -f $ATTRF ] ; then curl -k https://$MASTER/xcatws/nodes/$NODE?userName=wsuser&password=wspd<https://$master/xcatws/nodes/$NODE?userName=wsuser&password=wspd> > $ATTRF.xml || exit 8 fi # Convert # <tr><td>addkcmdline</td><td>sshd</td></tr> # to # export ATTR_addkcmdline="sshd" # sed -e '/^<[/]*table/d' \ -e "s/<tr><td>/export ATTR_/" \ -e 's;</td><td>;=";' \ -e 's;</td></tr>;";' < ${ATTRF}.xml > $ATTRF # load into the environment . $ATTRF || exit 7 To use this, one would call: “. /xcatpost/getnodeattr” from within a postscript. The wsuser user and policy must, of course, be set up first. Question 1. Is there any reason not to use curl and the REST API from postscripts during an install? Does this duplicate existing xCAT functionality? Question 2. It’s difficult to protect the “wsuser” password coded into /install/postscripts/getnodeattr. The file can’t be made read-only root, for example, because httpd needs to be able to read it. Is there a way to limit “wsuser” to GET calls? Thanks, Goran------------------------------------------------------------------------------ LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d_______________________________________________ xCAT-user mailing list [email protected]<mailto:[email protected]> https://lists.sourceforge.net/lists/listinfo/xcat-user
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