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taskmaster

Process supervisor in Go

Warning

This project is currently in progress

About

taskmaster is a school project, part of my cursus at 19. The directives are to write a supervisor-like process manager in any language with a server running child processes based on a configuration file and a client which sends basic instruction (restart, reload, kill, etc) in any language.

Design decisions

I decided to write the project in Go since it is a language I am currently learning and wish to become better at. For the the client-server communcation, I went for Google's gRPC through UNIX sockets since it fits my needs perfectly.

Usage

Server

Usage of taskmasterd
  -conf string
        config file path (default "/etc/taskmaster.yaml")
  -socket string
        path of the server's unix socket (default "/tmp/taskmaster.sock")

Example:

$ taskmasterd -conf ./prod.yaml -socket /tmp/taskmaster-prod.sock

Client

Usage of taskmasterctl
  -socket string
        path of the server's unix socket (default "/tmp/taskmaster.sock")

Example:

$ taskmasterctl -socket /tmp/taskmaster-prod.sock
tm> service nginx status
SERVICE: nginx
STATUS: running

Example configuration file

programs:
    nginx:
        cmd: "/usr/local/bin/nginx -c /etc/nginx/test.conf"
        numprocs: 1
        umask: 022
        workingdir: /tmp
        autostart: true
        autorestart: unexpected
        exitcodes:
            - 0
            - 2
        startretries: 3
        starttime: 5
        stopsignal: TERM
        stoptime: 10
        stdout: /tmp/nginx.stdout
        stderr: /tmp/nginx.stderr
        env:
        STARTED_BY: taskmaster
        ANSWER: 42
    vogsphere:
        cmd: "/usr/local/bin/vogsphere-worker --no-prefork"
        numprocs: 8
        umask: 077
        workingdir: /tmp
        autostart: true
        autorestart: unexpected
        exitcodes:
            - 0
        startretries: 3
        starttime: 5
        stopsignal: USR1
        stoptime: 10
        stdout: /tmp/vgsworker.stdout
        stderr: /tmp/vgsworker.stderr