Openstack -Delete Bulk Instances


Many of operation engineer look for solution how to delete instances in bulk from CLI or CURL call to reduce time effort, here is the filter method to do it, but please make sure that really you want to delete in bulk.


Here the best script method which i follows to do,

Source with required tenant, if you do as admin will delete all projects, so make sure of it.

Now run below CLI, which basically lists servers and grep its ID and do nova delete

nova list | awk '$2 && $2 != "ID" {print $2}' | xargs -n1 nova delete

In particular, the solution from dbxs uses the “name” field. If there are multiple instances with the same name, the “nova delete” operation will fali with:

Multiple server matches found for 'c0', use an ID to be more specific.
ERROR: Unable to delete any of the specified servers.

Openstack user data – ssh access of CentOS instance without key

You can use user-data to set a password for the user. When launching an instance you’ll paste this into the user-data:

ssh_pwauth: True 
disable_root: false 
  list: |
  expire: false

ssh_pwauth will turn on the ability to use password auth. disable_root will enable the root user. chpassword will setup a password for the user.

It’s not recommended to use this regularly. You should use this for testing. Otherwise you should be using the user + ssh-key.

This will allow you to SSH with a password. It didn’t work on Debian as the options were different in the sshd config, but should work with CentOS.