nfs | 易学教程

Access NFS share from Java program

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问题 I'd like to read some data from an NFS share from my Java program. I'd need the program to authenticate to the NFS server first, then do the I/O. (Requiring the NFS share to be previously mounted is not acceptable.) So, I'd like the functionality that's provided by this library: http://jcifs.samba.org/ , except for NFS instead of CIFS. Is such a thing built into Java already, or do I need a third-party library? I'm also interested in whether this can be done in Perl, Python, or Ruby. But

How to flush nfs attribute cache?

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问题 I need to find a way to flush the NFS attribute cache on the client side. stat() call reads ctime from attribute cache and not the actual value, takes upto 3 second for the actual value to be reflected in cache. using 'noac' option when mounting works but will affect performance in the long run. I came across solutions like doing a chown on the same owner of the file etc. but is there a proper method to flush the attribute cache before doing a stat()? and this prob happens only on Redhat

How can I use read timeouts with stat?

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问题 I have the following code: #!/bin/bash read -t1 < <(stat -t "/my/mountpoint") if [ $? -eq 1 ]; then echo NFS mount stale. Removing... umount -f -l /my/mountpoint fi How do I mute the output of stat while at the same time being still able to detect its error level in the subsequent test? Adding >/dev/null 2>&1 inside the subshell, or in the end of the read line does not work. But there must be a way... Thanks for any insights on this! 回答1: Use Command-Subsitution, Not Process Substitution

解决挂载相关命令无法使用

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挂载相关命令无法使用描述： Kali输入rpcinfo -p 和 showmount -e显示未找到命令。解决方式： Kali需要首先安装 nfs-command package 才能使用nfs挂载相关的命令。 $ sudo apt-get update $ sudo apt-get install nfs-common 来源： CSDN 作者： ps_x 链接： https://blog.csdn.net/weixin_43486390/article/details/103469029

How to ensure a safe file sync with sqlite and NFS

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问题 I have recently converted my workspace file format for my application to sqlite. In order to ensure robust operation on NFS I've used a common update policy, I do all modifications to a copy stored in a temp location on the local harddisk. Only when saving do I modify the original file (potentially on NFS) by copying over the original file with the temp file. I only open the orginal file to keep an exclusive lock on it so it someone else tries to open they will be warned that someone else is

apache cloud-stack 4.0 测试

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1、测试环境:操作系统redhat 6.3 x64 management 1台+nfs agent host 4台(2台启用HA)，只是对LIMUX kvm进行了测试 2、安装: apache 有yum 源,可以直接yum install 安装,比较简单. 3、初始化: 好多人都卡在初始化这步,二级存储挂载不了,官方文档也说的不是太清楚.其实是需要启动nfs version 3 ,默认是版本 4 .nfs server 编辑 /etc/sysconfig/nfs 启动版本3.nfs client 编辑/etc /nfsmount.conf Defaultvers=3 修改出处,默认是4 ,然后重启 libvirtd cloud-agent 就可以正常添加二级存储. 4、HA问题: HA 启用后有可能会损坏vm 虚拟文件。HA启动的条件是掉网线或者是机器掉电，正常shutdown 不会触发HA 5、扯蛋的nfs 比较崩溃，如果IO高的情况下,NFS估计会崩溃。 6、如果使用本地存储，则在线动态迁移等功能无法使用。 7 、 vm 的ip不能够手工指定来源： oschina 链接： https://my.oschina.net/u/142602/blog/114389

Java map / nio / NFS issue causing a VM fault: “a fault occurred in a recent unsafe memory access operation in compiled Java code”

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问题 I have written a parser class for a particular binary format (nfdump if anyone is interested) which uses java.nio's MappedByteBuffer to read through files of a few GB each. The binary format is just a series of headers and mostly fixed-size binary records, which are fed out to the called by calling nextRecord(), which pushes on the state machine, returning null when it's done. It performs well. It works on a development machine. On my production host, it can run for a few minutes or hours,

RHCE第15节课关于vsftpt samba nfs 三个服务

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今天主要是学习了ftp服务，samba文件共享服务，和NFS服务的相关知识，三个服务中，vsftpd主要负责文件传输，而samba和NFS主要是文件共享。来源： 51CTO 作者： caifufeng2011 链接： https://blog.51cto.com/12331786/2457326

【集群实战】NFS服务常见故障排查和解决方法

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NFS，全名叫Network File System，中文叫网络文件系统，是Linux、UNIX系统的分布式文件系统的一个组成部分，可实现在不同网络上共享远程文件系统。 NFS由Sun公司开发，目前已经成为文件服务的一种标准之一（RFC1904，RFC1813）。其最大的功能就是可以通过网络，让不同操作系统的计算机可以共享数据，所以可以把NFS看做是一个文件服务器。NFS缺点是其读写性能比本地硬盘要差一些。一、NFS服务常见故障排查： NFS服务出现了故障，主要从以下几个方面检查原因：（1）检查NFS客户机和服务器的负荷是否太高，Server和Client之间的网络是否正常；（2）检查/etc/exports文件的正确性；（3）必要时重启NFS和rpcbind服务；（4）运行下列命令重新启动rpcbind和NFS: /etc/init.d/nfs restart/etc/init.d/rpcbind restart chkconfig nfs onchkconfig rpcbind on 注意：在RHEL/CentOS 6.x里面，portmap服务改名为rpcbind服务了；顺便说一下，rpcbind服务也是图形界面的关键基础服务，不启动此服务，不能启动图形桌面。（5）检查Client上的mount命令或/etc/fstab的语法是否正确; （6）

How to use Extended File Attributes on NFS?

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问题 I have an NFS_Server - NFS_Client system. My client is mounted to an NFS_Server directory . I want to change the attribute of NFS_Server directory's files via NFS_Client mounted directory by using Extended File Attributes (xattr). When I tried to set an attribute from the client side, it gives the following answer: root@ubuntu:/mnt/nfs/var/nfs# setfattr -n user.comment -v "some comment" test.txt setfattr: nfs.txt: Permission denied My question is: is it possible to use Extended File