Practical Linux - Part 13 - Daemon & Cron Job | 守护进程与计划作业

Nov 13 - Daemon & Cron Job
- linux.vbird.org/linux_basic/0560daemons.php
- linux.vbird.org/linux_basic/0430cron.php
- Daemon
  - What?
    - Deamon - A Process of Some Service
  - Category
    - Signal-control
    - Interval-control
  - Naming
    - xxxxd
  - Service & Port
    - cat /etc/services
  - Start & Config
    - /etc/init.d/*
    - /etc/sysconfig/* | /etc/default/*
    - /etc/<service>d.conf, /etc/<service>d.d/*
    - /var/lib/* - data
    - /var/run/* - pid file
    - e.g.
      - /etc/init.d/crond start
      - service crond start
      - (status, stop, restart)
    - update-rc.d
- Cron/Crontab
  - What?
    - time-based job scheduler
  - atd & crond
  - e.g.
    - logrotate
    - locate
  - atd - linux.vbird.org/linux_basic/0430cron.php
  - crond
  - crontab [-u username] [-l|-e|-r]
- Assgnment
  - Log on your Amazon vm
  - Install cron
  - make sure the cron deamon is running
  - create a cron job that runs touch nov13 every 5 minutes on Tuesday & Thursday - make sure it creates the file
  - stop crond

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