such as Telnet, and the other is the port on the target machine where the Getty program is connected (for example, TTYP2). The Telnet program on the login machine and the login program on the target machine are communicated through the pseudo terminal ptyp2 and TTYP2.
The control terminal (/dev/tty) is a concept in the application. Each session group may have up to 1 control terminals, similar to Tty0, and performing the console interrupts currently in use. For this concept, it is recommended t
In Unix-like systems, users typically deal with a variety of related processes. Although there is only one terminal process (the user's login shell , which launches various programs and services through the shell) at login time, many related processes are usually generated shortly thereafter, such as the following:
Run non-interactive programs in the background (for example, "" in the Bash command)
Switch between various interactive proce
Deep understanding of daemon processes from the concept of process groups, sessions, and endpoints
First, write in front"Daemon" is a long-running background service process of Linux, and some people call it "daemon process". Our common httpd, named, sshd and other services are run in the daemon Daemon way, usuall
shell can run a foreground job and any number of background jobs, which is called job control.The difference between a job and a process group: If a process in the job has created a child process, the child process does not belong to the job. Once the job runs, the shell mentions itself to the foreground, and if the o
The Linux process has a certain relationship with each other. For example, each process has a parent process, and all processes are rooted in the init process, forming a tree structure. We are here to explain the process groups an
Turn from: http://shake863.javaeye.com/blog/187085
The following concepts are described in the Linux kernel1) Process Group2) session3) Control terminal1. Concept:A) Process groupA command line on the Shell forms a group of processesEach process belongs to a process groupEach pro
processes as process group IDs.After a sub-process calls the exec function, the ID of the sub-process cannot be used as the ID of the Process Group.========================================================== ========================================================
B) sessionOne login form a sessionA session can contai
The Linux process has a certain relationship with each other. For example, on the basis of the Linux process, we see that each process has a parent process, and all processes are rooted in the init process, forming a tree structure. We are here to explain the
Linux is a multi-user multitasking operating system that must support multiple users to log on to the same operating system at the same time.
When a user log on to a terminal will produce a session , each session has a session of the first process, that is, the process of creating a session, the establishment and terminal connection is the session first process
The origin of orphan Process Groups:
When a terminal controls the process (that is, the first process of a session) to terminate, the terminal can be used to establish a new session. This may cause a problem where any process in the old Session (A collection of one or more
The following author each use a sentence to summarize the project management knowledge System five process groups:Start the process group: The role is to set the project objectives, so that the project team can do something;Planning Process Group: The role is to develop the work line, so that the project team "by the laws";Execution
The terminal issues involve several concepts, including process groups, sessions, and jobs. The following sections describe them respectively. A session contains a series of processes. These processes are organized into several process groups according to different execution content. All processes in a session must be
1, change the default database: Modify the db.properties.2. Disable default users and groups, process definition, data model: Modify Activiti-standalone-context.xml
Id="Demodatagenerator" Class="Org.activiti.explorer.demo.DemoDataGenerator"> Name="Processengine" Ref="Processengine" /> Name="Createdemousersandgroups" Value= "false" /> name = "createdemoprocessdefinitions" value "false
Inter-process relationships: synchronous, mutex, and others.Shell Terminal: You can run a foreground job and any number of background jobs, which is called job control.Process Group : each process belongs to a process group in addition to a process ID. A process group is a c
Daemons, sessions, and process groups have a lot of good information on the web. I also collected a bunch of online, plus my own understanding. Dare not say original, just write in this fear oneself forget it. Caishuxueqian, inevitably have the mistake, welcome everybody to correct. The following writing is very good, we can go to see: http://www.cnblogs.com/forstudy/archive/2012/04/03/2427683.html. The fol
Foreword: There are two groups, although the production method is a little different, but the idea is basically close. Process: The first step is to enhance the light and shade contrast of the material image, and then use some special filters to add similar painting texture to the picture, and then turn the picture into black and white, and add the background and text to decorate.Source: Excellent network o
The failover processing process bitsCN.com after the master database of db0101 is down in 48 nodes groups online
Failover processing after 48 nodes in the online group and db0101 master database are down
When a call is received, db0101 is Down and an error is reported:
(1) Error 500,503,504 Error on the application page
(2) email alert db0201 is down now!
1. Initial Determination of symptoms
Ping ipv222
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