daemon | 易学教程

PHP Daemon/worker environment

阅读更多关于 PHP Daemon/worker environment

问题 Problem: I want to implement several php-worker processes who are listening on a MQ-server queue for asynchronous jobs. The problem now is that simply running this processes as daemons on a server doesn't really give me any level of control over the instances (Load, Status, locked up)...except maybe for dumping ps -aux. Because of that I'm looking for a runtime environment of some kind that lets me monitor and control the instances, either on system (process) level or on a higher layer (some

Create a daemon with double-fork in Ruby

阅读更多关于 Create a daemon with double-fork in Ruby

问题 What is the proper way to create a well-behaved Unix or Linux daemon in Ruby? What is the definition of a well-behaved daemon anyway, and how would one write such a program in Ruby? 回答1: According to Stevens's Advanced Programming in the UNIX Environment chapter 13, this is the procedure to make a well-behaved Unix daemon: Fork and have the parent exit. This makes the shell or boot script think the command is done. Also, the child process is guaranteed not to be a process group leader (a

java daemon thread and non-daemon thread

阅读更多关于 java daemon thread and non-daemon thread

问题 I am doing java past exam paper, and I have encounter the following question that is confusing me. Which of the following are true? (Choose all that apply.) A. When an application begins running, there is one daemon thread, whose job is to execute main(). B. When an application begins running, there is one non-daemon thread, whose job is to execute main(). C. A thread created by a daemon thread is initially also a daemon thread. D. A thread created by a non-daemon thread is initially also a

How to spawn a new independent process in Python

阅读更多关于 How to spawn a new independent process in Python

问题 I have a some Python code that occasionally needs to span a new process to run a shell script in a "fire and forget" manner, i.e. without blocking. The shell script will not communicate with the original Python code and will in fact probably terminate the calling Python process, so the launched shell script cannot be a child process of the calling Python process. I need it to be launched as an independent process. In other words, let's say I have mycode.py and that launches script.sh. Then

How does the JVM terminate daemon threads? or How to write daemon threads that terminate gracefully

阅读更多关于 How does the JVM terminate daemon threads? or How to write daemon threads that terminate gracefully

问题 Hypothetical scenario: I have a daemon thread responsible for some I/O, the main thread finishes and returns, and the JVM decides to terminate my daemon thread. How does it do so? Interrupt? Finalize? How can I code my daemon thread so that it reacts gracefully when terminated? 回答1: I just wrote the following code as a test: public class DaemonThreadPlay { public static void main(String [] args) { Thread daemonThread = new Thread() { public void run() { while (true) { try { System.out.println

How do I daemonize an arbitrary script in unix?

阅读更多关于 How do I daemonize an arbitrary script in unix?

问题 I'd like a daemonizer that can turn an arbitrary, generic script or command into a daemon. There are two common cases I'd like to deal with: I have a script that should run forever. If it ever dies (or on reboot), restart it. Don't let there ever be two copies running at once (detect if a copy is already running and don't launch it in that case). I have a simple script or command line command that I'd like to keep executing repeatedly forever (with a short pause between runs). Again, don't

How do I daemonize an arbitrary script in unix?

阅读更多关于 How do I daemonize an arbitrary script in unix?

rsync 守护进程daemon

阅读更多关于 rsync 守护进程daemon

服务端配置：rsync的配置文件是/etc/rsyncd.conf。注意这个文件默认是不存在的，需要手动创建。下面是一个配置好的rsyncd.conf ######rsyncd.conf####### uid = rsync ----à非系统虚拟用户 gid = rsync use chroot =no -à防止出现安全问题 maxconnections = 200 --à最大连接数 timeout = 300 --à超时时间 pid file =/var/run/rsyncd.pid --à进程pid所在的文件 lock file =/var/run/rsync.lock -à锁 log file =/var/log/rsyncd.log -à出错的日志文件 [zhaofan] --à模块 path = /zhaofan/ à可以理解为共享目录 ignore errors --à忽略错误 read only =false list = false -à是否允许列表 hosts allow =192.168.1.0/24 --à允许的主机 hosts deny =0.0.0.0/32 auth users =rsync_backup -à虚拟用户 secrets file= /etc/rsync.password -à用户对应的密码文件 #######rsyncd.config#

Python script as linux service/daemon

阅读更多关于 Python script as linux service/daemon

问题 Hallo, I'm trying to let a python script run as service (daemon) on (ubuntu) linux. On the web there exist several solutions like: http://pypi.python.org/pypi/python-daemon/ A well-behaved Unix daemon process is tricky to get right, but the required steps are much the same for every daemon program. A DaemonContext instance holds the behaviour and configured process environment for the program; use the instance as a context manager to enter a daemon state. http://www.jejik.com/articles/2007/02

What's the difference between nohup and a daemon?

阅读更多关于 What's the difference between nohup and a daemon?

问题 What are the implications of running a script as a daemon versus using nohup? I know what the difference is in terms of forking processes etc., but what impact does that have on my script? 回答1: The nohup command is the poor man's way of running a process as a daemon. As Bruno Ranschaert noted, when you run a command in an interactive shell, it has a controlling terminal and will receive a SIGHUP (hangup) signal when the controlling process (typically your login shell) exits. The nohup command