inotify

Inotifywait for large directories

柔情痞子 提交于 2019-12-04 21:15:59
In the inotifywait man changes the following is stated -r, --recursive Watch all subdirectories of any directories passed as arguments. Watches will be set up recursively to an unlimited depth. Symbolic links are not tra‐versed. Newly created subdirectories will also be watched. Warning: If you use this option while watching the root directory of a large tree, it may take quite a while until all inotify watches are established , and events will not be received in this time. Also, since one inotify watch will be established per subdirectory, it is possible that the maximum amount of inotify

Using read with inotify

女生的网名这么多〃 提交于 2019-12-04 17:56:54
问题 I have been studying inotify call, but I still a bit flaky when it comes to the read interface. These are the most relevant resourses I could find regarding how to properly interface with inotify using read(2): http://www.ibm.com/developerworks/linux/library/l-ubuntu-inotify/index.html http://www.linuxjournal.com/article/8478 They both implement it in the same way, they first define the following sizes: #define EVENT_SIZE ( sizeof (struct inotify_event) ) #define BUF_LEN ( 1024 * ( EVENT_SIZE

Why won't Middleman include the rb-inotify and therubyracer gems once installed?

时光怂恿深爱的人放手 提交于 2019-12-04 15:27:33
I have: $ ruby -v ruby 1.9.2p290 (2011-07-09 revision 32553) [i686-linux] $ middleman version Middleman 2.0.13.1 $ cat /etc/debian_version 6.0.3 if I start a project like so: $ middleman init np --rack --bundler --template=html5 create np/config.ru create np/Gemfile run bundle install Fetching source index for http://rubygems.org/ Using multi_json (1.0.3) Using activesupport (3.1.1) Using addressable (2.2.6) Using chunky_png (1.2.5) Using coffee-script-source (1.1.2) Using execjs (1.2.9) Using coffee-script (2.2.0) Using fssm (0.2.7) Using sass (3.1.10) Using compass (0.11.5) Using daemons (1

Monitoring file using inotify

喜你入骨 提交于 2019-12-04 09:52:23
问题 I am using inotify to monitor a local file, for example "/root/temp" using inotify_add_watch(fd, "/root/temp", mask). When this file is deleted, the program will be blocked by read(fd, buf, bufSize) function. Even if I create a new "/root/temp" file, the program is still block by read function. I am wondering if inotify can detect that the monitored file is created and the read function can get something from fd so that read will not be blocked forever. Here is my code: uint32_t mask = IN_ALL

how to make sure not to read a file before finishing the write to it

≡放荡痞女 提交于 2019-12-04 08:08:22
When trying to monitor a directory using inotify on Linux, as we know, we get notified as soon as the file gets created (before the other process finish writing to it) Is there an effective way to make sure that the file is not read before writing to it is complete by the other process? We could potentially add a delayed read; but as we all know, it is flawed. For a little bit more clarity on the scenario; the two processes are running as different users; the load expected is about a few hundred files created per second. Based on your question, it sounds like you're currently monitoring the

Rsync服务

混江龙づ霸主 提交于 2019-12-04 07:13:21
rsync概述 rsync是类unix系统下的数据镜像备份工具——remote sync。一款支持快速增量备份的工具,支持本地复制,远程同步等,rsync 命令来同步系统文件之前要先登录remote 主机认证,认证过程中用到的协议有2种:ssh 协议和rsync协议。 rsync特性 能更新整个目录和树和文件系统 有选择性的保持符号链接、硬链接、文件属性、权限、设备以及时间等 对于安装来说,无任何特殊权限要求 对于多个文件来说,内部流水线减少文件等待的延时 能用 rsh、ssh或直接端口作为传输入口端口 支持匿名 rsync同步文件,是理想的镜像工具 同步源 rsync(服务器): 指备份操作的远程服务器,也称为备份源 主要包括两种: rsync源、ssh源 构建 ssh同步源 实验环境准备:一台服务器,一台客户端 在服务器和客户端上创建单独的测试目录( /server/ssh、/client/ssh) Rsync 命令常用法 基本格式: rsync 【选项】 原始位置 目标位置 常用选项: -a::归档模式,,递归保留对象属性,,等同于 -rlptgoD -v::显示同步过程的详细信息(verbose)信息 -z::在传输文件是进行压缩((compress) -H::保留硬链接文件 -A:保留 ACL 属性信息 --delete::删除目标位置有而原始位置没有的文件 -r:

inotify not firing notifications on file modification

百般思念 提交于 2019-12-04 05:55:15
I have been tweaking the example here to make it repeatedly watch a file for 'modifications'. My code is here . In my tests the inotify notification is only firing the first time the file is 'modified'(i.e. touch 'ed). Any subsequent modifications to the file are not causing any notifications to fire. stat shows that the 'Modify' time has changed. Also, modifying the code to remove the watch and re-add each time a notification fires(i.e. move inotify_add_watch and inotify_rm_watch to be inside the while(1) loop in my sample ) did not help resolve this issue. I was wondering if any one here

Rsync+Inotify 实现数据同步

烂漫一生 提交于 2019-12-04 01:51:33
Rsync (remote sync)是UNIX及类UNIX-Like平台下一款强大的数据镜像备份软件,它不像FTP或其他文件传输服务那样需要进行全备份,Rsync 可以根据数据的变化进行差异备份,从而减少数据流量,提高工作效率.你可以使用它进行本地数据或远程数据的复制,Rsync可以使用 SSH 安全隧道进行加密数据传输,Rsync 服务器端定义源数据,Rsync客户端仅在源数据发生改变后才会从服务器上实际复制数据至本地,如果源数据在服务器端被删除,则客户端数据也会被删除,以确保主机之间的数据是同步的.Rsync 使用 TCP-873 端口. Inotify 是一个Linux特性,它监控文件系统操作,比如读取、写入和创建 Inotify 反应灵敏,用法非常简单,并且比 cron 任务的繁忙轮询高效得多,本章学习如何将 inotify 集成到您的应用程序中,并发现一组可用来进一步自动化系统治理的命令行工具. Rsync 文件同步 ◆Rsync服务端配置◆ 1.服务端首先安装Rsync软件包,并创建一个 /common 目录拷贝进去一些配置文件用于测试. [root@localhost ~]# yum install -y rsync [root@localhost ~]# mkdir -p /common [root@localhost ~]# cp -a /etc/*

How could I detect when a directory is mounted with inotify?

China☆狼群 提交于 2019-12-03 12:36:27
问题 I'm using Linux Inotify to detect FS events on my program. How could I be notified when a device is mounted on a monitored directory? 回答1: I don't think you can do it with inotify . Here is the method though: Read uevents from kernel via a Netlink socket and filter out those where "ACTION" is not "mount" . Read and parse "/proc/mounts" when you get an event with a "mount" action. Find a record for a mount point with device that was just mounted and filter it out if it's not the directory you

inoutfy与rsync进行实时同步

穿精又带淫゛_ 提交于 2019-12-03 07:38:31
一.更新阿里epel源 a.安装镜像源: curl -o /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo --- 扩展源信息 yum makecache --更新yum源信息 二.安装inotfy-tools yum install -y inotify-tools [root@nfs01 ~]# rpm -ql inotify-tools /usr/bin/inotifywait <--- 实现对数据目录信息变化监控(重点了解的命令) /usr/bin/inotifywatch <--- 监控数据信息变化,对变化的数据进行统计 三.文件目录信息 [root@web01 inotify]# ls max_queued_events max_user_instances max_user_watches max_user_watches: 设置inotifywait或inotifywatch命令可以监视的文件数量(单进程) 默认只能监控8192个文件 max_user_instances: 设置每个用户可以运行的inotifywait或inotifywatch命令的进程数 默认每个用户可以开启inotify服务128个进程 max_queued_events: 设置inotify实例事件