Script to change floating IP address on Infomaniak's Public Cloud. Name/ID of the instance has to be provided as the first argument of this.

change-ip.sh

#!bin/bash
export OS_AUTH_URL=https://api.pub1.infomaniak.cloud/identity/v3
export OS_PROJECT_NAME=
export OS_PROJECT_DOMAIN_NAME=default
export OS_USERNAME=
export OS_USER_DOMAIN_NAME=default
export OS_PROJECT_ID=
export OS_IDENTITY_API_VERSION=3
export OS_INTERFACE=public
export OS_REGION_NAME=dc4-a
export OS_PASSWORD=

instance_port_id=$(openstack port list --server $1 -c ID -f value)
echo "Instance port ID : $instance_port_id"

network_id=$(openstack port show $instance_port_id -c network_id -f value)
echo "Network ID : $network_id"

old_ip_id=$(openstack floating ip list --port $instance_port_id -c ID -f value)
echo "Old IP ID : $old_ip_id"

new_ip_id=$(openstack floating ip create $(openstack network list --name ext-floating1 -c ID -f value) -c id -f value)
echo "New IP ID : $new_ip_id"

echo "Changing IPs..."
openstack floating ip unset $old_ip_id --port
openstack floating ip set $new_ip_id --port $instance_port_id
openstack floating ip delete $old_ip_id
echo "New IP : $(openstack floating ip show $new_ip_id -f value -c floating_ip_address)"