solar/examples/hosts_file

Very simple solar example two nodes + hosts file mapping

Run:

python examples/hosts_file/hosts.py

Then you can continue with standard solar things:

solar changes stage -d
solar changes process
solar or run-once last
watch -n 1 solar or report last

Wait until all actions have state SUCCESS, after that check /etc/hosts files on both nodes, it will contain entries like:

10.0.0.3 first1441705177.99
10.0.0.4 second1441705178.0

If you want to try out revert functionality - you can do it in a next way:

After you created all the stuff, print history like this:

solar ch history

Output:

log task=hosts_file1.run uid=282fe919-6059-4100-affc-56a2b3992d9d
log task=hosts_file2.run uid=774f5a49-00f1-4bae-8a77-90d1b2d54164
log task=node1.run uid=2559f22c-5aa9-4c05-91c6-b70884190a56
log task=node2.run uid=18f06abe-3e8d-4356-b172-128e1dded0e6

Now you can try to revert creation of hosts_file1

solar ch revert 282fe919-6059-4100-affc-56a2b3992d9d
solar ch stage
log task=hosts_file1.remove uid=1fe456c1-a847-4902-88bf-b7f2c5687d40
solar ch process
solar or run-once last
watch -n 1 solar or report last

For now this file will be simply cleaned (more cophisticated task can be added later). And you can create revert of your revert, which will lead to created hosts_file1 resource and /etc/hosts with appropriate content

solar ch revert 282fe919-6059-4100-affc-56a2b3992d9d
solar ch stage
log task=hosts_file1.remove uid=1fe456c1-a847-4902-88bf-b7f2c5687d40
solar ch process
solar changes run-once last
watch -n 1 solar changes report last

After this you can revert your result of your previous revert, which will create this file with relevant content.

solar ch history -n 1
log task=hosts_file1.remove uid=1fe456c1-a847-4902-88bf-b7f2c5687d40
solar ch revert 1fe456c1-a847-4902-88bf-b7f2c5687d40
solar ch stage
log task=hosts_file1.run uid=493326b2-989f-4b94-a22c-0bbd0fc5e755
solar ch process
solar changes run-once last
watch -n 1 solar changes report last

How to discard pending changes ?

After database was populated by some example, lets say

python examples/hosts_file/hosts.py deploy

User is able to discard all changes with

solar ch discard

Or any particular change with

solar ch stage
log task=hosts_file1.run uid=a5990538-c9c6-49e4-8d58-29fae9c7aaed
solar ch discard a5990538-c9c6-49e4-8d58-29fae9c7aaed