Kubectl patch命令使用

kubectl patch

使用（patch）补丁修改、更新资源的字段。

支持JSON和YAML格式。

请参阅https://htmlpreview.github.io/?https://github.com/kubernetes/kubernetes/blob/HEAD/docs/api-reference/v1/definitions.html中说明，查找资源字段是否为可变的。

语法

$ patch (-f FILENAME | TYPE NAME) -p PATCH

示例

使用patch更新Node节点。

kubectl patch node k8s-node-1 -p '{"spec":{"unschedulable":true}}'

使用patch更新由“node.json”文件中指定的类型和名称标识的节点

kubectl patch -f node.json -p '{"spec":{"unschedulable":true}}'

更新容器的镜像

kubectl patch pod valid-pod -p '{"spec":{"containers":[{"name":"kubernetes-serve-hostname","image":"new image"}]}}'
kubectl patch pod valid-pod --type='json' -p='[{"op": "replace", "path": "/spec/containers/0/image", "value":"new image"}]'

更改service类型为NodePort形式

kubectl patch  svc schedule -n uat --type='json' -p '[{"op":"replace","path":"/spec/type","value":"NodePort"},{"op":"add","path":"/spec/ports/0/nodePort","value":30930}]'

kubectl patch svc schedule -n uat --type='json' -p '[{"op":"remove","path":"/spec/ports/0/nodePort"},{"op":"replace","path":"/spec/type","value":"ClusterIP"}]'

给pod手动添加dns解析

kubectl -n monitoring patch  deployments prometheus-grafana --patch '{
    "spec": {
        "template": {
            "spec": {
                "hostAliases": [
                    {
                        "hostnames":
                        [
                            "prometheus-prometheus-oper-prometheus"
                        ],
                            "ip": "10.233.10.10"
                    }
                ]
            }
        }
    }
}'