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  • keypair  :  configured SSH key which is needed to connect to the VM (see EWC - OpenStack Command-Line client for how to import it ) 
  • image  :  the Virtual Machine image (see EWC - VM images and default users )
  • flavor  :  the resources (CPU, RAM, Disk) configuration for the VM (see as reference EWC VM plans )
  • network  : the network to be attached to the VM : external-internet: access to the Internet with public IP ; private-<tenant>: local private network within the tenant.
  • security group : security groups are sets of applied IP filter rules which define networking access to the instance 



Excerpt

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The available selectable options could also be checked using the Opnstack CLI commands:

Code Block
$ openstack keypair list

$ openstack image list

$ openstack flavor list 

$ openstack network list

$ openstack security group list


Create a new Virtual Machine

Once known all mandatory inputs listed in the pre-requisites, a new virtual machine can be created with the following command:

Code Block
$ openstack server create --flavor <flavor name> --image <image name> --key-name <keyname> --network <network name> --security-group <security group name> <vm name>


Example:

Code Block
$ openstack server create --flavor "2cpu-2gbmem-30gbdisk" --image "Rocky-9.4-2024071709441" --key-name "my-user-key" --network "private-my-tenancy-name" --security-group "default" --security-group "ssh" "my-new-vm"


Once created the VM details can be reviewed with the command:

Code Block
$ openstack server show <vm name>

Attach a Floating-IP to the VM

If a VM is attached only to the "private" network, if required a floating-ip can be attached to the VM to provide also a public IP.


First create a new Floating IP :

Code Block
$ openstack floating ip create <external network>

where "external network" is the external network that grants access to internet (e.g. external-internet for ECMWF )


Then it is possible to attach the created floating IP to the VM with :

Code Block
$ openstack server add floating ip <vm name> <created floating ip>