Red Hat OpenShift 4 - Downscale control-plane components (remove HA)

ocp4_downscale.sh

#
# WARNING: This document is not a official Red Hat procedure,  and the commands will disable HA 
#          of control-plane components, turning your environment to not supported.
#

oc patch clusterversion/version --type='merge' -p "$(cat <<- EOF
spec:
  overrides:
  - group: apps/v1
    kind: Deployment
    name: etcd-quorum-guard
    namespace: openshift-machine-config-operator
    unmanaged: true
  - group: apps/v1
    kind: Deployment
    name: cluster-monitoring-operator
    namespace: openshift-monitoring
    unmanaged: true
EOF
)"

oc scale --replicas=1 deployment/etcd-quorum-guard -n openshift-machine-config-operator

oc scale --replicas=1 ingresscontroller/default -n openshift-ingress-operator
oc scale --replicas=1 deployment.apps/console -n openshift-console
oc scale --replicas=1 deployment.apps/downloads -n openshift-console
oc scale --replicas=1 deployment.apps/oauth-openshift -n openshift-authentication
oc scale --replicas=1 deployment.apps/packageserver -n openshift-operator-lifecycle-manager

oc scale --replicas=0 deploy/cluster-monitoring-operator -n openshift-monitoring

oc patch prometheus/k8s -n openshift-monitoring --type='merge' -p "$(cat <<- EOF
spec:
  replicas: 1
EOF
)"

oc patch alertmanagers/main -n openshift-monitoring --type='merge' -p "$(cat <<- EOF
spec:
  replicas: 1
EOF
)"

oc scale --replicas=1 deployment.apps/prometheus-adapter -n openshift-monitoring
oc scale --replicas=1 deployment.apps/thanos-querier -n openshift-monitoring