kubelet gc 85%

[root@node1 ~]# tail -5   /var/lib/kubelet/config.yaml
streamingConnectionIdleTimeout: 0s
syncFrequency: 0s
volumeStatsAggPeriod: 0s
imageGCHighThresholdPercent: 60   #触发镜像垃圾回收的磁盘使用率百分比
imageGCLowThresholdPercent: 50    #镜像垃圾回收试图释放资源后达到的磁盘使用率百分比