Custom Process
How to define a process
Process is defined in procfile.js, depending on the following syntax:
procfile.js
module.exports = function (pandora) {
pandora
.process('processName');
}
pandora.process('processName') means that it defines a process called processName, this statement returns a ProcessRepresentationChainModifier object.
We can use this object to improve the definition of the process.
The following is a simple example：
procfile.js
module.exports = function (pandora) {
// If the process definition exists, modify it, otherwise it is new
pandora.process('processName')
// rename process
// obtained without passing parameters
.name('renameIt')
// Identifies the number of lateral scaling of the process, default 1, number to number or `auto`(auto to CPU number)
// obtained without passing parameters
.scale(5)
// set the node.js parameters, all covered
// use `process.execArgv` to get it in process
// If require incremental: .nodeArgs().push('--expose-gc')
// obtained without passing parameters
.nodeArgs(['--expose-gc'])
// set process parameters
// use `process.argv` to get it in process
// If require incremental: nodeArgs().push('--a=b')
// obtained without passing parameters
.args(['--a=b', '--c=d'])
// environmental variables of the process, all covered
// If require incremental: .env().x = 'y'
// obtained without passing parameters
.env({
ENV_VAR: 'envValue'
})
// process start order
// obtained without passing parameters
.order(1)
// the entrance file for this process
// if not set, the process will not start (unless a service is assigned to the process)
// obtained without passing parameters
.entry('./app.js')
// drop the process definition
.drop()
}
The process will not start without the program entrance
The process will not start if there is no start entrance to the process.
The start entrance, including：
- The definition of
.entry() - A service is assigned to the process
The relationship between Scale and the process
- If a process defines a scale that is greater than 1, start with
ScalableMater, that is, themaster/workermode. - If a process defines a scale of 1, start it directly.
As the following image：
