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背景长期以来，弹性云线上服务一直饱受缓存不一致的困扰。
缓存不一致的发生一般伴随着kube-apiserver的升级或重启。且当缓存不一致问题发生时，用户侧能够较为明显的感知，问题严重时会引发线上故障。而常见的故障有：
平台数据不一致：Pod状态一会正常，一会不正常，并且来回跳动
服务管理事件丢失：服务变更时，服务管理未正常工作，如服务树未挂载、流量未接入等等
在问题未定位之前，弹性云制定了诸多问题感知与及时止损策略：
问题感知：
人工：kube-apiserver升级或重启时，人工通知关联方也重启平台服务
智能：配置监控与报警策略，当一段时间内未收到k8s对象的变更事件时，发送告警信息
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背景近期，线上报障了多起Pod删除失败的Case，用户的多次删除请求均已失败告终。Pod删除失败的影响主要有二：
面向用户：用户体验下降，且无法对该Pod执行后续的发布流程
面向弹性云：失败率提升，SLA无法达标
并且，随着弹性云Docker版本升级 (1.13 → 18.06) 进度的推进，线上出现Pod删除失败的Case隐隐有增多的趋势。
线上问题无小事！不论是从哪个角度出发，我们都应该给线上环境把把脉，看看是哪个系统出了问题。
问题定位由于线上出Case的频率并不低，基本每周都会出现，这反而给我们定位问题带来了便利^_^。
排查线上问题的思路一般分如下两个步骤：
定位出现问题的组件
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锄禾日当午，值班好辛苦；
汗滴禾下土，一查一下午。
问题描述今天，在值班排查线上问题的过程中，发现系统日志一直在刷docker异常日志：
123May 12 09:08:40 HOSTNAME dockerd[4085]: time="2021-05-12T09:08:40.642410594+08:00" level=error msg="stream copy error: reading from a closed fifo"May 12 09:08:40 HOSTNAME dockerd[4085]: time="2021-05-12T
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2020-10-15
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背景承接上文，近期我们排查弹性云线上几起故障时，故障由多个因素共同引起，列举如下：
弹性云在逐步灰度升级docker版本至 18.06.3-ce
由于历史原因，弹性云启用了docker服务的systemd配置选项 MountFlags=slave
为了避免dockerd重启引起业务容器重建，弹性云启用了 live-restore=true 配置，docker服务发生重启，dockerd与shim进程mnt ns不一致
在以上三个因素合力作用下，线上容器在重建与漂移场景下，出现删除失败的事件。
同样，文章最后也给出了两种解决方案：
长痛：修改代码，忽略错误
短痛：修改配置，一劳永逸
作为
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背景近期，弹性云线上集群发生了几起特殊的容器漂移失败事件，其特殊之处在于容器处于Pod Terminating状态，而宿主则处于Ready状态。
宿主状态为Ready说明其能够正常处理Pod事件，但是Pod却卡在了退出阶段，说明此问题并非由kubelet引起，那么docker就是1号犯罪嫌疑人了。
下文将详细介绍问题的排查与分析全过程。
抽丝剥茧排除kubelet嫌疑Pod状态如下：
12[stupig@master ~]$ kubectl get pod -owidepod-976a0-5 0/1 Terminating 0
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