今日Kaijia的Proxmox集群中有一台服务器异常不稳定，经常丢失状态，并且在执行任何操作时常常遇到错误提示：
Failed to allocate directory watch: Too many open files
检查了一下这台服务器上运行的LXC容器有30多个，当中不乏数据库、MongoDB、DA及爬虫等IO大户，然而利用lsof查看了一下当前使用的文件句柄亦无发现任何异常。
今天Kaijia日常（已经算是月常了）从Oracle的官方源更新MySQL之后发现MySQL无法正常启动了，查看了一下/var/log/mysql.log也异常单一。
2019-04-28T02:59:39.881846Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.16) starting as process 384
2019-04-28T02:59:50.800045Z 4 [System] [MY-013381] [Server] Server upgrade from ‘80015’ to ‘80016’ started.
2019-04-28T02:59:52.461014Z 4 [ERROR] [MY-013384] [Server] Could not create server upgrade info file at ‘/var/lib/mysql/’.
2019-04-28T02:59:52.468088Z 0 [ERROR] [MY-013380] [Server] Failed to upgrade server.
2019-04-28T02:59:52.468307Z 0 [ERROR] [MY-010119] [Server] Aborting
2019-04-28T02:59:54.080113Z 0 [System] [MY-010910] [Server] /usr/sbin/mysqld: Shutdown complete (mysqld 8.0.16) MySQL Community Server – GPL.
早前Oracle家出错都能打印出一长串错误日志，这次仅仅留下有Could not create server upgrade info file at ‘/var/lib/mysql/’一句。
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