inotify

配置 inotify+rsync 实时同步

南笙酒味 提交于 2019-11-28 05:35:13
rsync 虽然可以实现快速备份,但是什么东西都不可能是十全十美的,作为计划任务备份,都是固定时间进行的,而且延迟明显、实时性差,当同步源长期不变化时,密集的定期任务是不必要的。 实时备份就不同了,一旦同步源出现变化,立即启动备份,只要同步源无变化,则不执行备份,但是他只能实现上传功能。 Linux内核提供了inotify通知接口,用来监控文件系统的各种变化情况,如文件存取、删除、移动、修改等。利用这个机制,可以非常方便地实现文件异动告警、增量备份,并针对目录或文件的变化及时作出响应。 将inotify机制和rsync工具相结合,可以实现触发式备份(实时同步)——只要原始位置的文档发生变化,则立即启动增量备份操作,否则处于静默状态,这样,避免了周期性备份时存在的延迟性、周期过密等问题。 在Linux内核中,默认的inotify机制提供了三个调控参数: [root@localhost myweb]# cat /proc/sys/fs/inotify/max_queued_events 16384 #监控事件队列数 [root@localhost myweb]# cat /proc/sys/fs/inotify/max_user_instances 128 #最多监控实例数 [root@localhost myweb]# cat /proc/sys/fs/inotify/max

How to check in python that a file in a folder has changed?

对着背影说爱祢 提交于 2019-11-27 22:58:47
I need to know in python whenever a new file was added/removed/modified in a particular directory Is there a way for that? I'm looking for an "inofity"-like function (from POSIX). Thanks Use inotify-tools (In the original version, I mentioned pyinotify , but it had issues, and now is deprecated and not recommended). You can use inotify for python , which is NOT the same as PyInotify (older). As mentioned in the similar question , you might want to have a look at http://packages.python.org/watchdog/ which also works on Windows. 来源: https://stackoverflow.com/questions/12582720/how-to-check-in

How to monitor a complete directory tree for changes in Linux?

守給你的承諾、 提交于 2019-11-27 18:06:23
How can I monitor a whole directory tree for changes in Linux ( ext3 file system)? Currently the directory contains about half a million files in about 3,000 subdirectories , organized in three directory levels. Those are mostly small files (< 1kb, some few up to 100 kb). It's a sort of queue and I need to know when files are being created, deleted or their content modified within 5-10 seconds of that happening. I know there is inotify and sorts, but AFAIK they only monitor a single directory, which means I would need 3,000 inotify handles in my case - more than the usual 1024 handles allowed

实时同步sersync实战

孤街醉人 提交于 2019-11-27 16:39:23
实时同步sersync实战 什么是实时同步 实时同步是一种只要当前目录发生变化则会触发一个事件,事件触发后会将变化的目录同步至远程服务器。 sersync和rsync+inotify对比 提到数据同步就必然会谈到 rsync ,一般简单的服务器数据传输会使用 ftp/sftp 等方式,但是这样的方式效率不高,不支持差异化增量同步也不支持实时传输。针对数据实时同步需求大多数人会选择 rsync+inotify-tools 的解决方案,但是这样的方案也存在一些缺陷(文章中会具体指出), sersync 是国人基于前两者开发的工具,不仅保留了优点同时还强化了实时监控,文件过滤,简化配置等功能,帮助用户提高运行效率,节省时间和网络资源。 项目地址 sersync项目实战 1)环境准备 角色 外网IP(NAT) 内网IP(LAN) 安装工具 web01 eth0:10.0.0.7 eth1:172.16.1.7 部署代码(提交作业) nfs-server eth0:10.0.0.31 eth1:172.16.1.31 rsync+inotify+sersync backup eth0:10.0.0.41 eth1:172.16.1.41 rsync-server 1.实时同步哪台服务器的目录,那么就在哪台服务器上安装 sersync 2.只要安装 sersync 就必须安装 rsync 和

How do I program for Linux's new `fanotify` file system monitoring feature?

醉酒当歌 提交于 2019-11-27 12:21:59
问题 fanotify , built on top of fsnotify , is supposed to replace inotify which replaced dnotify . Are there some good programming examples or existing utilities that use fanotify to watch for changes in a filesystem? How much detail does fanotify provide? 回答1: This LWN article is often quoted as a source of documentation for fanotify. But the description there appears to be out of date. fanotify no longer works using a socket connection. Instead, there are two new libc functions wrapping syscalls

配置inotify+rsync实时同步

时光总嘲笑我的痴心妄想 提交于 2019-11-27 10:37:11
对rsync服务及命令不熟悉的,可以参考博文 通过rsync实现远程同步 这里就不多说了! Linux内核从2.6.13版本开始就已经提供了inotify通知接口,用来监控文件系统的各种变化情况,如文件存取、删除、移动、修改等。利用这一机制,可以非常方便的实现文件异动告警、增量备份,并针对目录或文件的变化及时作出响应。 将inotify机制与rsync工具相结合,可以实现出发时备份(实时同步)——只要原始位置的文档发生变化,则立即启动增量备份,否则处于静默等待状态,如图所示: 这样,就避免了按固定周期备份时存在的延迟性、周期过密问题! 正是因为inotify通知机制由Linux内核提供,因此主要做本机监控,在触发式备份中应用时更适合上行同步。 实验所需的软件包inotify-tools-3.14.tar.gz网盘链接: https://pan.baidu.com/s/1Ov006-6MV76VMVWL1LFyAA 提取码:np88 配置inotify+rsync实时同步大致分为4步: (1)调整inotify内核参数; (2)安装inotify-tools软件包; (3)编写触发式同步脚本; (4)测试实验效果。 本次要基于上篇博客的实验环境: 通过rsync实现远程同步 下面依次介绍并配置( 以下操作均在服务器B执行 !): (1)调整inotify内核参数 在Linux内核中

What is a reasonable amount of inotify watches with Linux?

自作多情 提交于 2019-11-27 09:40:52
问题 I am working on a daemon that monitors file events via inotify to trigger various types of events when files are accessed. I have read that watches are a little expensive, because the Kernel is storing the full path name of every file being watched. How many watches would be too many? Edit: Mostly, I'm wondering .. have you ever seen a noticeable performance hit, if so, at how many watches did it happen? Yes, I have to monitor / recursively (however its a minimal bootstrapped system). 回答1:

What is the proper way to use inotify?

本秂侑毒 提交于 2019-11-27 07:50:09
I want to use the inotify mechanism on Linux. I want my application to know when a file aaa was changed. Can you please provide me with a sample how to do that? joschi Documentation ( from Monitor file system activity with inotify ) The inotify C API inotify provides three system calls to build file system monitors of all kinds: inotify_init() creates an instance of the inotify subsystem in the kernel and returns a file descriptor on success and -1 on failure. Like other system calls, if inotify_init() fails, check errno for diagnostics. inotify_add_watch() , as its name implies, adds a watch

nexus搭建maven仓库管理

为君一笑 提交于 2019-11-27 03:51:26
Linux搭建nexus仓库 1.安装jdk 1.1 获取安装包,解压到指定目录: 1 tar xf jdk.tar.gz -C /opt/export 1.2 配置环境变量: 1 # vim /etc/profile 2 export JAVA_HOME=/opt/export/jdk 3 export PATH=$JAVA_HOME/bin:$PATH 4 export CLASSPATH=.:$JAVA_HOME/lib:$JAVA_HOME/jre/lib:$JAVA_HOME/lib/tools.jar 5 export RUN_AS_USER=root # 后边启动nexus需要 6 7 # source /etc/profile 1.3 出现下面结果,说明部署成功 1 # java -version 2 java version "1.7.0_80" 3 Java(TM) SE Runtime Environment (build 1.7.0_80-b15) 4 Java HotSpot(TM) 64-Bit Server VM (build 24.80-b11, mixed mode) 2.安装nexus 2.1下载安装 下载地址: https://www.sonatype.com/download-oss-sonatype https://help

inotify and bash

早过忘川 提交于 2019-11-27 01:18:14
问题 I am trying to make a bash script with inotify-tools that will monitor a directory and alter all new files by removing lines containing "EE". Once altered it will move the files to another directory #!/bin/sh while inotifywait -e create /home/inventory/initcsv; do sed '/^\"EE/d' Filein > fileout #how to capture File name? mv fileout /home/inventory/csvstorage fi done Please help? 回答1: By default, the text output from inotifywait -e CREATE is of form watched_filename CREATE event_filename