Update cheatsheets

tldr/openstack-server

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# openstack server
+
+> Manage OpenStack virtual machines.
+> OpenStack Compute service, aka OpenStack Nova, mainly hosts and manages cloud computing systems.
+> More information: <https://docs.openstack.org/python-openstackclient/latest/cli/command-objects/server.html>.
+
+- List servers:
+
+`openstack server list`
+
+- Start server(s):
+
+`openstack server start {{instance_id1 instance_id2 ...}}`
+
+- Stop server:
+
+`openstack server stop {{instance_id1 instance_id2 ...}}`
+
+- Create new server:
+
+`openstack server create --image {{image_id}} --flavor {{flavor_id}} --network {{network_id}} --wait {{server_name}}`
+
+- Delete server(s):
+
+`openstack server delete {{instance_id1 instance_id2 ...}}`
+
+- Migrate server to different host:
+
+`openstack server migrate --live {{host_hostname}} {{--shared-migration|--block-migration}} --wait {{instance_id}}`
+
+- Perform a soft or hard reset to the server:
+
+`openstack server reboot {{--soft|--hard}} --wait {{instance_id}}`