Configure an IPv6 floating IP for the ingress router on cloudscale

This how-to provides instructions for configuring an IPv6 floating ip for the ingress router of an existing cloudscale OpenShift 4 cluster.

Prerequisites

The how-to 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.

The minimum required Gandalf version is v0.1.0.

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

Configuration

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 the migration_dir environment variable so that the subsequent gandalf invocation is shorter.
```
export migration_dir=\
./dependencies/openshift4-terraform/migrations/cloudscale-router-v6 (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}/configure-router-v6.workflow" \
  ${migration_dir}/*.yaml
```
Guided-setup container image
```
guided-setup-base -e "migration_dir=${migration_dir}" \
  run "${migration_dir}/configure-router-v6.workflow" \
  ${migration_dir}/*.yaml
```
The guided-setup-base alias is defined in docker/aliases.sh in the appuio/guided-setup repository.