Migrate the API floating IP from Puppet LBs to cloudscale LBaaS

This how-to is for migrating the API floating IP of a cloudscale cluster from the Puppet LBs to cloudscale LBaaS instances.

Prerequisites

The migration procedure is implemented as a Gandalf workflow. You need to be able to run Gandalf locally. Both a local installation and the guided-setup container image should work.

So far, the workflow has only been tested on Linux with a local Gandalf installation.

Migration

Run Commodore to setup a working directory for the cluster to migrate

We recommend running this in an empty directory. Alternatively, you can use an existing Commodore working directory for the cluster you want to migrate.
```
export CLUSTER_ID=c-the-cluster-to-migrate-1234
commodore catalog compile $CLUSTER_ID
```
Set and export the migration_dir environment variable which the workflow uses internally.
```
export migration_dir=\
./dependencies/openshift4-terraform/migrations/cloudscale-api-lbaas (1)
```
1 This assumes that your current working directory is the Commodore working directory for the cluster to migrate
Run Gandalf

For clusters which are located behind a SOCKS5 proxy, the workflow steps which try to access the cluster may not work correctly unless you set the https_proxy variable manually.
Local Gandalf
```
gandalf run "${migration_dir}/api-lb-migration.workflow" \
  "${migration_dir}/api-lb-migration.yaml"
```
Guided-setup container image
```
guided-setup-base -e "migration_dir=${migration_dir}" \
  run "${migration_dir}/api-lb-migration.workflow" \
  "${migration_dir}/api-lb-migration.yaml"
```
The guided-setup-base alias is defined in docker/aliases.sh in the appuio/guided-setup repository.