daemon

Load Ruby on Rails models without loading the entire framework

只愿长相守 提交于 2019-12-24 15:33:47
问题 I'm looking to create a custom daemon that will run various database tasks such as delaying mailings and user notifications (each notice is a separate row in the notifications table). I don't want to use script/runner or rake to do these tasks because it is possible that some of the tasks only require the create of one or two database rows or thousands of rows depending on the task. I don't want the overhead of launching a ruby process or loading the entire rails framework for each operation.

SIGCHILD not catching signal when child process dies

戏子无情 提交于 2019-12-24 14:19:04
问题 I'm trying to create a daemon process that handles several child threads. But the child thread doesn't seem to send the signal back to the parent to call the function. i have tried to take it out of the class and make it a standard function but that doesn't seem to help either. class Daemon { public function __construct() { $set = pcntl_signal(SIGCHLD, array($this, 'childSignalHandler')); $pid = pcntl_fork(); if ($pid == -1) { echo 'could not fork'; } elseif ($pid) { // parent sleep(20); //

JGit: How to use InMemoryRepository to learn about dfs implementations

跟風遠走 提交于 2019-12-24 12:44:11
问题 I want to learn how to implement an alternative dfs backend for jgit and am looking at https://github.com/eclipse/jgit/blob/master/org.eclipse.jgit/src/org/eclipse/jgit/storage/dfs/InMemoryRepository.java as an example. How ever I am having a hard time figuring out how to set this up as a standalone git daemon. Basically I want to be able to start a java process that is the git server for a single (empty) in-memory git repository, and then I want to be able to use a git client to push/pull

微服务架构Day39-Docker容器基础用法

萝らか妹 提交于 2019-12-24 09:39:50
Docker容器基础用法 Docker体系结构 Docker程序环境 Docker常用命令 Docker体系结构 The Docker Daemon: Docker Daemon 负责监听 Docker API 请求 管理Docker对象: 镜像: Image.静态的,不会运行 镜像是一个创建Docker容器的只读的指令模版 一个镜像通常是基于另一个镜像的 可以创建自定义的镜像 容器: Container.动态的,有生命周期 容器是镜像的一个运行实例 可以使用Docker API或者CLI命令行界面创建,运行,停止,移动和删除一个容器 可以连接Docker容器到一个或多个网络,连接存储到容器,或者基于容器的当前状态创建一个新镜像 网络 : Network 容器卷: Volume.持久化存储 插件 : Plugins The Docker Client: Docker Client 是用户和 Docker 进行交互的工具 Docker命令使用 Docker API Docker Registries: Docker Registry 负责保存 Docker 镜像 Docker Hub 和 Docker Cloud 是公开的Docker仓库,Docker默认从 Docker Hub 上搜索镜像 可以运行私有的仓库 Docker程序环境 docker-ce的配置文件: /etc

root path issues when server is run as a daemon

ⅰ亾dé卋堺 提交于 2019-12-24 08:58:57
问题 i have several views, as well as some gems, that access the filesystem. this seems to work fine until i run the server as a daemon. rails (4.2.3) for example in one of my views I access the README file in the root of the app File.read('README.md') when running as a daemon, i get the error No such file or directory @ rb_sysopen - README.md the error page shows the Rails.root path, which is correct. i CAN fix this problem by doing: File.read("#{Rails.root}/README.md") however this issue breaks

Why hangs the web page after it started a daemon on the underlying server?

寵の児 提交于 2019-12-24 06:49:54
问题 I would like to start/stop a daemon process on my home server via a simple web page. The html is like this: <form action="http://192.168.2.101/cgi-bin/managedaemon.pl" method="post"> <input type="submit" value="Start" name="start"/> <input type="submit" value="Stop" name="stop"/> </form> The managedaemon.pl is like this: #!/usr/bin/perl system("/usr/local/theprog/startserver"); print "Content-type:text/html\r\n\r\n"; print "<html>"; ... And the startserver is like this: #!/bin/bash cd /usr

How to start Bottle as a daemon from another script?

青春壹個敷衍的年華 提交于 2019-12-24 06:01:47
问题 I would like to use BottlePy as a daemon started from another script and I have issues turning a standalone script ( webserver.py ) into a class. The standalone version of my webserver below works fine: import bottle @bottle.get('/hello') def hello(): return 'Hello World' @bottle.error(404) def error404(error): return 'error 404' bottle.run(host='localhost', port=8080) My intent is now to start it from the main script below as from webserver import WebServer from multiprocessing import

python多进程编程常用到的方法

帅比萌擦擦* 提交于 2019-12-23 21:46:52
python中的多线程其实并不是真正的多线程,如果想要充分地使用多核CPU资源,在python中大部分情况需要使用多进程。python提供了非常好用的多进程包Multiprocessing,只需要定义一个函数,python会完成其它所有事情。借助这个包,可以轻松完成从单进程到并发执行的转换。multiprocessing支持子进程、通信和共享数据、执行不同形式的同步,提供了Process、Queue、Pipe、LocK等组件 一、Process 语法:Process([group[,target[,name[,args[,kwargs]]]]]) 参数含义:target表示调用对象;args表示调用对象的位置参数元祖;kwargs表示调用对象的字典。name为别名,groups实际上不会调用。 方法:is_alive():    join(timeout):    run():    start():    terminate(): 属性:authkey、daemon(要通过start()设置)、exitcode(进程在运行时为None、如果为-N,表示被信号N结束)、name、pid。其中daemon是父进程终止后自动终止,且自己不能产生新的进程,必须在start()之前设置。 1.创建函数,并将其作为单个进程 from multiprocessing import

Tomcat安装和使用

大城市里の小女人 提交于 2019-12-23 18:54:30
1、Tomcat简介 Tomcat是Apache开源组织下的开源免费的中小型Web应用服务器,支持javaEE中的servlet和jsp规范。 安装Tomcat之前必须安装JDK,详细步骤见: https://www.cnblogs.com/dadian/p/11934087.html 虽然Tomcat6.0之后就不需要安装JDK了,只需要JRE(Java Runtime Environment:运行环境),但还是建议安装JDK,因为JDK里自带了JRE。 2、Windows版安装和使用 下载地址: http://tomcat.apache.org/index.html 安装(因为下载的是zip格式,只要解压就能使用,所以这里就是直接启动,无需安装) 解决启动界面的中文乱码问题 测试安装是否成功,在浏览器内访问 http://localhost:8080/ 启动不成功的解决方法 如果启动不成功,看下Tomcat默认使用的端口号(8080和8009),是否被其他程序占用了 在控制台输入 netstat -aon ,可查看当前计算机端口的所有使用情况 输入 netstat -aon|findstr '8080' ,可查看8080端口的使用情况 修改Tomcat使用的默认端口 同时启动两个Tomcat服务 先启动原Tomcat,再启动复制出来的Tomcat,会发现第一个启动成功

Paster daemon won't shut down because can't read own pid file

偶尔善良 提交于 2019-12-23 16:06:03
问题 TL;DR version : When I ask Paster to stop-daemon, it fails to read its own file that it uses to track its process id. Longer version : I am running Paster (pastescript 1.7.3) on Python 2.7.1 on Windows Vista. My first surprise comes from running a simple web-site: >paster serve development.ini Starting server in PID 15184. serving on http://127.0.0.1:5000 I expected to find a paster.pid file in the same directory, but I don't. Odd. Never mind, let's make it explicit, by killing that process