def scale_down():
"""Removes excess nodes from the load balancer (thus extra nodes are made into inactive nodes)."""
use_only(*classify_nodes()[EXTRA])
if len(env.nodes) == 0:
info("There are no extra nodes to scale down.")
else:
lb_remove_nodes()
def decommission_unused():
"""De-provisions inactive and orphan nodes."""
configure()
nodes = classify_nodes()
use_only(*nodes[INACTIVE] + nodes[ORPHAN])
if len(env.nodes) == 0:
info("There are no inactive or orphan nodes to decommission.")
else:
decommission_nodes()
def decommission_all():
"""De-provisions all nodes."""
configure()
use_only(*instances_with_platform_and_role(env.platform, env.role))
if len(env.nodes) == 0:
info("There are no nodes to decommission.")
else:
show()
if confirm("Are you sure you want to decommission ALL %d nodes?" % len(env.nodes), default=False):
decommission_nodes()
def provision():
"""Provisions env.num_nodes new nodes."""
configure()
use_only()
env.new_nodes = provision_nodes(env.num_nodes, classify_nodes()[MAX_ID] + 1)