4.2的集群升级很简单，更新一下镜像仓库，然后运行一个命令，等着就好了。
# on base host
cat << EOF > /etc/docker-distribution/registry/config.yml
version: 0.1
log:
fields:
service: registry
storage:
cache:
layerinfo: inmemory
filesystem:
rootdirectory: /data/4.2.7/registry
delete:
enabled: true
http:
addr: :443
tls:
certificate: /etc/crts/redhat.ren.crt
key: /etc/crts/redhat.ren.key
EOF
systemctl restart docker-distribution
# on helper node
# oc patch OperatorHub cluster --type json -p '[{"op": "add", "path": "/spec/disableAllDefaultSources", "value": true}]'
oc patch OperatorHub cluster --type json -p '[{"op": "remove", "path": "/spec/disableAllDefaultSources"}]'
oc patch -n openshift-cluster-samples-operator configs.samples.operator.openshift.io cluster -p '{"items[0]":{"spec":{"managementState":"Removed"}}}' --type=merge
oc adm upgrade --allow-explicit-upgrade --allow-upgrade-with-warnings=true --force=true --to-image=registry.redhat.ren/ocp4/openshift4:4.2.7
