daemon

What are the behavioral differences between a daemon and a normal process?

由 怎甘沉沦 提交于 2019-12-31 09:01:22
问题 I know that daemons run in the background mostly i.e. they require very less interaction from the user. Wikipedia lists some of the types of daemons that commonly exist: Dissociating from the controlling tty Becoming a session leader Becoming a process group leader Staying in the background by forking and exiting (once or twice). This is required sometimes for the process to become a session leader. It also allows the parent process to continue its normal execution. This idiom is sometimes

Differences in controlling daemons & applications

由 拟墨画扇 提交于 2019-12-31 03:54:11
问题 With respect to this excellent post: What's the difference between nohup and a daemon? I would like to ask the following: After launching an application from my terminal, the application keeps running either in the background or the foreground and the only thing I can do to interact with it is by sending it signals from my terminal (given that stdin is still in place). However, after a daemon process is launched, I realized that it can be controlled with other means like querying it or

Enable PAM configuration (limits.conf) for a running daemon

由 为君一笑 提交于 2019-12-31 02:26:07
问题 I'm currently attempting to develop a sandbox using Docker. Docker spawns process through a running daemon, and I am having a great deal of trouble enabling the limits set forth in the limits.conf file such that they apply to the daemon. Specifically, I am running a forkbomb such that the daemon is the process that spawns all the new processes. The nproc limitation I placed on the user making this call doesn't seemed to get applied and I for the life of me can not figure out how to make it

centos 安装nginx

由 可紊 提交于 2019-12-31 01:19:39
1、准备工作 选首先安装这几个软件：GCC，PCRE（Perl Compatible Regular Expression），zlib，OpenSSL。 Nginx是C写的，需要用GCC编译；Nginx的Rewrite和HTTP模块会用到PCRE；Nginx中的Gzip用到zlib； 用命令“# gcc”，查看gcc是否安装；如果出现“gcc: no input files”信息，说明已经安装好了。 否则，就需要用命令“# yum install gcc”，进行安装了！一路可能需要多次输入y，进行确认。 安装好后，可以再用命令“#gcc”测试，或者用命令“# gcc -v”查看其版本号。 同样方法，用如下命令安装PCRE，zlib，OpenSSL（其中devel，是develop开发包的意思）： # yum install -y pcre pcre-devel # yum install -y zlib zlib-devel # yum install -y openssl openssl-devel 2、下载并安装 创建目录（nginx）并进去；然后，从官方地址（http://nginx.org/）下载，解压，配置，编译，安装： # mkdir nginx && cd nginx # wget http://nginx.org/download/nginx-1.7.3.tar

技巧：Linux rsync 同步由手动到自动

由 故事扮演 提交于 2019-12-30 21:20:43
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> rsync 是一个快速增量文件传输工具，它可以用于在同一主机备份内部的备分，我们还可以把它作为不同主机网络备份工具之用。本文主要讲述的是如何自架rsync 服务器 ，以实现文件传输、备份和镜像。相对tar和wget来说，rsync 也有其自身的优点，比如速度快、安全、高效; 手动的： 首先要建立好两台服务器之间的公钥和密钥，那样就不需要每次都输入密码，也可以实现自动了。 可以先使用rpm -qa |grep rsync 查看rsync是否已经安装， 软件 下载 Rysnc的主页地址为：http://rsync.samba.org/ 本试验的测试环境(2台，一个服务端，一个客户端) rsync服务端的ip：192.168.48.60 rsync客户端的ip：192.168.48.148 ----------------------------------------------- 以下先配置服务器端： 1. 安装rsync包 # rpm -q rsync rsync-2.6.3-1 2. rsync只使用一个配置文件就是/etc/rsyncd.conf 这个文件一般是没有的，那就自己建一个好了 # vi /etc/rsyncd.conf uid = nobody gid = nobody max

用VMWARE安装Mac OSX Tiger 10.4.4 X86

由 北慕城南 提交于 2019-12-30 12:59:33
首先说明,这个版本是FOR X86的,绝对不需要用虚拟机什么的来安装,PEARPC也可以退休了,因为,APPLE终于把MAC移到PC上来了,至于原因,网上说,APPLE跟IBM合作出现了问题,所以,APPLE两手准备,把MAC移到INTEL的X86处理器上来.不过,确实到时候了,要是微软的VISTA出来了,而界面效果方面要是比MAC好的话,估计到时候,MAC想打入PC市场就更难了.不过,现在,不管怎么说,MAC的UI确实是顶尖的,无论你是怀着什么心情去看,它确实够酷够炫而且用户体验非常棒 在以前,我为了装上MAC,曾经折腾过N回,都是失败了,PEARPC是能装MAC,可是,又怎么样呢,速度那个慢呀 这回我拿到的是MAC OSX TIGER 10.4.4 X86,没错,确实是X86版 首先,这个ISO镜像这回可以直接用DAEMON加载为虚拟光驱了,我拿到的光盘镜像为4,588,544KB大小,就是4G,由于我没有DVD光驱,所以,只能用虚拟光驱,然后用VMWARE来安装了 我用的VMWARE是WORKSTATION 5.5.1版本,如果你想用GSX SERVER 3.2也行,不过,我觉得,没必要了 首先,在装之前,要清点一下: 1,MAC OSX 10.4.4 X86版 ISO镜像一张 2,DAEMON TOOL虚拟光驱软件 3,VMWARE WORKSTATION 5.5.1 4

Paste (Python) Web Server - Autoreload Problem

由 断了今生、忘了曾经 提交于 2019-12-30 10:35:31
问题 When I start the `Paste' web server in daemon mode, it seems to kill off it's ability to reload when the timestamp of a source file is updated. Here is how I start the daemon... cd ${project} && ../bin/paster serve --reload --daemon development.ini; cd ..; ...which defeats one of the main points of using Paste (for me). Has anyone come across this or know what I'm doing wrong? To be complete, the file that I'm changing is a controller file. The version is `PasteScript 1.7.3' 回答1: I believe

How feasible is a daemon written in PHP, using ignore_user abort and set_time_limit(0)

由 核能气质少年 提交于 2019-12-30 05:21:06
问题 I'm mucking about with daemons, and wondered how feasible (in terms of memory and cpu usage, and reliability) it is to do this using PHP: <?php // Ignore user aborts and allow the script // to run forever ignore_user_abort(true); set_time_limit(0); $fp = fopen('loop.log', 'w'); fwrite($fp, date('Y-m-d H:i:s') . ' Started' . PHP_EOL); while(1) { fwrite($fp, date('Y-m-d H:i:s') . ' Looped' . PHP_EOL); if (file_exists('loop.stop')) { break; } // Sleep for 100 seconds sleep(100); } fwrite($fp,

What's the difference between calling daemon() and calling fork(), setsid(), fork(), etc.?

由 百般思念 提交于 2019-12-30 00:36:13
问题 I've been looking at creating Unix dæmons, and there seem to be two methods. The long-winded one, which seems to come up when searching is to call fork() , setsid() , fork() again, chdir() to somewhere safe, set umask() and, finally, close() stdin , stdout and stderr . Running man daemon , however, brings up information on a daemon() function, which seems to do all the same stuff as above. Are there any differences between the two approaches or is daemon() just a convenience function that

04 Docker 制作自定义镜像包

由 假如想象 提交于 2019-12-29 23:47:42
制作自定义镜像包的两种方式 1、创建容器并对容器进行修改，然后打包容器为镜像 2、使用Dockerfile编排镜像 自定义镜像 1、创建一个容器 docker run -itd centos 2、进入容器进行修改配置 docker exec -it 容器id bash 停止容器，不是必须的 3、创建镜像并验证 docker commit 容器id 镜像名称：标签 4、打包镜像 docker save 镜像名称 > 包名.tar 使用 Dockerfile 编排镜像 给容器配置 yum 源 查看宿主机的 yum 源配置 [rhel7] name=rhel baseurl=ftp://192.168.4.254/rhel7 enabled=1 gpgcheck=0 练习： 创建一个容器，配置 yum 源，并且安装 ifconfig 命令 使用 Dockerfile 编排镜像 FROM centos #基于centos镜像进行编排（如没有就搜索并下载，有就直接使用） RUN rm -f /etc/yum.repos.d/*.repo #运行删除文件命令 ADD local.repo /etc/yum.repos.d/local.repo #将当前目录的local.repo文件复制添加到 docker里的指定目录 RUN yum install net-tools vim-enhanced
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