我们遇到了在代码部署期间间歇性发生的问题. NFS在读取文件时对文件进行高速缓存,但如果在代码部署期间读取文件,则文件将保持脏状态,就像部署期间文件未更改一样.我们解决此问题的唯一方法是在部署后清除NFS缓存.
我们的Web服务器返回所有请求的空白页,直到清除NFS缓存.
有没有设置或有没有人建议如何解决这个问题？
我们目前正在运行NFS v3.
解决方法
存在用于在NFS挂载(客户端)上缓存文件属性的不同选项：
NOAC
Use the noac mount option to achieve attribute cache coherence
among multiple clients. Almost every file system operation checks file
attribute information. The client keeps this information cached for a
period of time to reduce network and server load. When noac is in
effect,a client’s file attribute cache is disabled,so each operation
that needs to check a file’s attributes is forced to go back to the
server. This permits a client to see changes to a file very quickly,
at the cost of many extra network operations.
lookupcache=none
If the client ignores its cache and validates every
application lookup request with the server,that client can
immediately detect when a new directory entry has been either created
or removed by another client. You can specify this behavior using
lookupcache=none. The extra NFS requests needed if the client does not
cache directory entries can exact a performance penalty. Disabling
lookup caching should result in less of a performance penalty than
using noac,and has no effect on how the NFS client caches the
attributes of files.
actimeo=n
Using actimeo sets all of acregmin,acregmax,acdirmin,and acdirmax to the same value.
- acregmin=n,The minimum time (in seconds) that the NFS client caches attributes of a regular file before it requests fresh
attribute information from a server. If this option is not
specified,the NFS client uses a 3-second minimum.
- acregmax=n,The maximum time (in seconds) that the NFS client caches attributes of a regular file before it requests fresh
attribute information from a server. If this option is not
specified,the NFS client uses a 60-second maximum.
- acdirmin=n,The minimum time (in seconds) that the NFS client caches attributes of a directory before it requests fresh attribute
information from a server. If this option is not specified,the NFS
client uses a 30-second minimum.
- acdirmax=n,The maximum time (in seconds) that the NFS client caches attributes of a directory before it requests fresh attribute
information from a server. If this option is not specified,the NFS
client uses a 60-second maximum.
取自NFS man page.
我希望这有帮助.
（编辑：李大同）
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