nfs | 易学教程

Check if NFS share is mounted in python script

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问题 I wrote a python script that depends on a certain NFS share to be available. If the NFS share is not mounted it will happily copy the files to the local path where it should be mounted, but fail later when it tries to copy some files back that were created on the NFS server. I'd like to catch this error specifically so I can print a useful error message that will tell the users of this script what they have to do. My first idea would be to execute mount using subprocess and then check the

mount system call in linux cannot display the mountpoint of file system by df command

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问题 I am trying to use mount() instead of mount command in my program, I use the following mount() successfully, the result returned success instead of Invalid Argument . int rc = mount("172.16.74.20:/data/redun/snmp","/mnt/data/redun/snmp", "nfs",0,"soft,timeo=2,addr=172.16.74.20"); if (rc != 0) { printf("mount failed, errCode=%d, reason=%s\n",errno, strerror(errno)); } But when I use df -h to check the mountpoint, there are nothing displayed. I found the related device was not mounted yet. What

CentOS7下NFS服务安装及配置

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CentOS7下NFS服务安装及配置系统环境：CentOS Linux release 7.4.1708 (Core) 3.10.0-693.el7.x86_64 软件版本：nfs-utils-1.3.0-0.48.el7_4.x86_64 网络环境中配置了DNS服务器，NFS服务器对应的域名是nfs.st.local，IP是192.168.1.18。配置过程中全部使用域名。一、安装 nfs客户端和服务端都安装nfs-utils包，同时自动安装rpcbind。安装后会创建nfsnobody用户和组，uid和gid都是65534。 # yum -y install nfs-utils 二、配置端口 nfs除了主程序端口2049和rpcbind的端口111是固定以外，还会使用一些随机端口，以下配置将定义这些端口，以便配置防火墙 # vim /etc/sysconfig/nfs #追加端口配置 MOUNTD_PORT=4001　　 STATD_PORT=4002 LOCKD_TCPPORT=4003 LOCKD_UDPPORT=4003 RQUOTAD_PORT=4004 三、NFS权限说明 1、普通用户当设置all_squash时：访客时一律被映射为匿名用户(nfsnobody) 当设置no_all_squash时：访客被映射为服务器上相同uid的用户

k8s 存储 nfs服务

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1.所有节点安装nfs yum install nfs-utils -y 2.配置nfs服务端，在master节点上 vim exports /data 10.0.0.0/24(rw,async,no_root_squash,no_all_squash) 3.在master节点上创建共享目录 mkdir /data 4.启动服务 systemctl restart rpcbind systemctl restart nfs 5.修改配置文件 volumes: - name: mysql nfs: path: /data/mysql-wp server: 10.0.0.11 来源： https://www.cnblogs.com/yangxiaoni/p/12031338.html

NFS服务学习笔记

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NFS服务一、NFS服务介绍 NFS（Network File System）网络文件系统主要用于Linux系统上实现文件共享的一种协议，其客户端主要是Linux 没有用户认证机制，且数据在网络上传送的时候是明文传送，一般只能在局域网中使用支持多节点同时挂载及并发写入企业应用：为集群中的web server提供后端存储该服务包括的组件： RPC（Remote Procedure Call Protocol）：远程过程调用协议，它是一种通过从网络从远程计算机程序上请求服务；不需要了解底层网络技术的协议。 rpcbind //负责NFS的数据传输，远程过程调用tcp协议端口111 nfs-utils //控制共享哪些文件，权限管理二、NFS服务器搭建 [root@server ~]# rpm -q rpcbind rpcbind-0.2.0-11.el6.x86_64 [root@server ~]# rpm -aq|grep ^nfs nfs-utils-1.2.3-54.el6.x86_64 nfs-utils-lib-1.1.5-9.el6.x86_64 nfs4-acl-tools-0.3.3-6.el6.x86_64 ```powershell~~~ /etc/exports (man 5 exports 共享目录共享选项 /nfs/share (ro

NFS mount System Call in linux

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问题 I am trying to mount a source directory from nfs server to a destination directory in embedded board having linux. The following command works perfectly as expected in shell prompt in the board. mount -t nfs -o nolock 10.126.62.45:/vol/home/avinoba/Sky /mnt What is the equivalent system call to be used in program for the command above? I tried the below call but the mount failed with "Invalid Argument" if(mount("10.126.62.45:/vol/home/avinoba/Sky","/mnt","nfs",MS_MGC_VAL,"nolock") == -1) {

What happens in NFS if 2 or more servers try to write the same file simultaneously?

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问题 I'm working on a PHP webapp that does automatic resizing of images and I'm thinking of storing the cached copies on the NFS mounted NAS so it's easy for me to flush the cache when images are updated. The only thing I'm worried about is what happens in general with NFS if 2 or more of the servers in the cluster are trying to create the same image cache file at the same time? There's a pretty good chance that when the cache gets flushed for content updates that they could collide like that, but

NFS 的网络问题

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在虚拟机上安装了 ubuntu ，用 petalinux 定制适用于 zynq板卡的 debian 系统使用 NFS 将在 ubuntu 内编译完成的 SDK工程目录挂载到 zynq板卡debian 系统的 /mnt 文件下具体步骤参考文档《course_s4_ZYNQ那些事儿-Linux实验篇V1.06》第四章 NFS服务安装使用 NFS 要求 Ubuntu 的 ip 与 zynq板卡的 ip 处于同一个网段（例如192.168.111.xx，前三位相同），即同一个局域网内。答案在最后第4条 1 对于网络的说明此时电脑主机的网卡信息如上，WLAN 为主机外接网络，以太网为闲置网口， VMware_Network_Adapter 为虚拟网卡（VMnet1 为虚拟交换机，均为虚拟机 host_only 使用）， VMware_Network_Adapter 为虚拟网卡（VMnet8 为虚拟交换机，均为虚拟机 NAT模式使用），虚拟机默认使用 NAT 模式，VMnet8 的ip 即为虚拟机模拟网卡ip 2 网络 NAT 模式，桥接模式，host_only 模式的区别参考： https://blog.csdn.net/zkuncn/article/details/78452098 NAT模式是所有的虚拟机挂在新的网段下（相对于VMnet8）

Set GPIO remotely

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问题 I haven't tried this yet but I don't think I can use NFS to set /sys/class/gpio/gpio48/value remotely on a beaglebone. I think I read you could do this a different way but I would really like to write to a file on remote server and have it set /sys/class/gpio/gpio48/value locally on beaglebone. I don't know how to link these two files up. I am using java to program but I don't think that should make a big difference. Using BeagleBone Black GPIOs 回答1: Not sure if NFS will work this way to but

nodejs open nfs files by inode (or a the fastest way to reopen a file)

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问题 I am currently writing a caching system that will hold serialized (json) data on disk and in memory in order to reduce I/O load on a database. The system will work by holding the last X number of accessed files in memory and read other files from disk. I have read that there are systems out there that reduce I/O load on nfs (which I may use in the future) systems by opening files by inode. My questions are: Is there a way to open files on a nfs file system by inode in nodejs? If not, what