Install workflow

main workflow

• parse commandline for create/modify/reconstruct mode, config file and config file option replacements
  • create: setup and start new vm's as cluster nodes and configure them according to config file
  • modify: use existing nodes
  • reconstruct: generate config file from existing servers
• read config file
• validate config file
• act according to command mode

create workflow

• copy existing vm stub
• modify vm stub to contain new uuids and mac addresses
• generate ssh keys for inter node comm.
• customize config file and build iso to provide it with the ssh keys, rpms and the node prep command to vm via cd image
• start the vm's
• wait for callback from the vm's (may be automatic or by hand)
• vm configures ip, hostname, routing and ssh authentication according to config file in iso, if necessary
• vm calls back management node with prep status
• callback provides node prep status and triggers node customization.
• check for required packages (ntp, partitioner, lvm, drbd, heartbeat, db2) on the nodes and install/update if necessary
• check and configure ntp if necessary
• check for required partitions and create if necessary
• check for required vm's and lv's and create if necessary
• check for required filesystems and create if necessary
• check for required drbd devices and create if necessary (define primary node with valid data in config file)
• check for hb config and create it if necessary (use custom udp port to allow for more clusters in one subnet, use a unique cluster auth key)
• on secondary check for db2 instances and create stubs if necessary (fail if non ha instance already exists!)
• on primary check for db2 instances and create if necessary
• on primary check if db2 instances are on drbd devices and move if necessary
• on primary check if databases exist and create if necessary
• check for database backup tools and install if necessary
• check if databases are coverd by db2 backup tool config and add them if necessary
• wait for the other node to appear and being in sync

modify workflow

like create workflow except skipping the first five steps