Services are typically controlled by a daemon, which is simply a background process running, listening for a client to request a specific service on a specific port.
服务通常由守护程序控制，简单来说守护程序就是一种正在运行的后台进程，侦听客户机对特定端口上的特定服务提出的请求。
With AIX, the iptrace is a background daemon, so you must explicitly start and stop the tool to switch the process on and off. For example, to start, type.
对于AIX,iptrace是一个后台守护进程，因此您必须启动和停止该工具，以便对进程状态进行切换。
The update index process can either be done manually using the command shown in Listing 5 or automatically scheduled using a background daemon.
索引更新过程可以使用清单5中的命令手工执行，也可以使用后台守护进程自动执行。
And finally, it makes itself into a resident program (known as a daemon) so it can quietly process browser requests in the background while other processes are running.
最终，它将自身创建为一个驻留程序(也称为daemon)，这样就可以在运行其他进程的同时在后台安静地处理浏览器请求。
If you'd prefer to start MongoDB as a daemon process in the background, issue the following command instead: $ sudo mongod --fork --logpath /var/log/mongodb.log --logappend.
如果您想作为后台守护程序启动MongoDB ，发出以下命令： $sudomongod --fork --logpath /var/log/mongodb.log --logappend.
If you'd prefer to start MongoDB as a daemon process in the background, issue the following command instead: $ sudo mongod --fork --logpath /var/log/mongodb.log --logappend.
如果您想作为后台守护程序启动MongoDB ，发出以下命令： $sudomongod --fork --logpath /var/log/mongodb.log --logappend.
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