工作中遇到一个需求，需要将已经安装的operator版本从2.3降级到2.2，然后运行升级脚本测试，验证脚本可以将operator从2.2升级到2.3。所以花了点时间研究如何降级olm管理的operator。
查看operator的csv版本
代码语言：javascript复制$ k get packagemanifest ansible-automation-platform-operator -n olm -o jsonpath='{.status.channels[?(@.name=="stable-2.2-cluster-scoped")].currentCSV}'
aap-operator.v2.2.2-0.1677634835
$ k get packagemanifest ansible-cloud-addons-operator -n olm -o jsonpath='{.status.channels[?(@.name=="stable-2.2-cluster-scoped")].currentCSV}'
aca-operator.v2.2.1-0.1669768483修改subscription中的channel和csv
将channel修改成要降级的版本，并指定上一步获取的csv版本：
代码语言：javascript复制spec:
channel: stable-2.2-cluster-scoped
installPlanApproval: Manual
name: ansible-automation-platform-operator
source: redhat-operators
sourceNamespace: olm
startingCSV: aap-operator.v2.2.2-0.1677634835
spec:
channel: stable-2.2-cluster-scoped
installPlanApproval: Manual
name: ansible-cloud-addons-operator
source: redhat-operators
sourceNamespace: olm
startingCSV: aca-operator.v2.2.1-0.1669768483删除高版本的csv和installplan
代码语言：javascript复制$ k delete csv aap-operator.v2.3.0-0.1680015684 aca-operator.v2.3.0-0.1680014818
$ k delete ip install-jg9dh install-9vkts修改installplan
将approved修改成true，这里需要修改generation值最大的installplan，也就是最新的installplan。
代码语言：javascript复制spec:
approval: Manual
approved: true
clusterServiceVersionNames:
- aap-operator.v2.2.2-0.1677634835
- aca-operator.v2.2.1-0.1669768483查看csv验证降级成功
代码语言：javascript复制$ k get csv
NAME DISPLAY VERSION REPLACES PHASE
aap-operator.v2.2.2-0.1677634835 Ansible Automation Platform 2.2.2 0.1677634835 Succeeded
aca-operator.v2.2.1-0.1669768483 Ansible Cloud Addons 2.2.1 0.1669768483 Succeeded
cert-manager.v1.11.0 cert-manager 1.11.0 cert-manager.v1.10.2 Succeeded升级operator
将之前对subscription的修改revert回去，然后修改最新的installplan，operator就会升级到高版本。
LEo at 00:12
