20180718_jeffrey - silenceuncrio/diary GitHub Wiki

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M300 再加上 cronie 這 recipe 之後除了擁有 crond 和 crontab 之外

root@Cellular Router:~# type crond
crond is /usr/sbin/crond
root@Cellular Router:~# type crontab
crontab is /usr/bin/crontab

還有 /etc/init.d/crond 這支 script

#!/bin/sh
### BEGIN INIT INFO
# Provides: crond crontab
# Default-Start:  2345
# Default-Stop:   016
# Short-Description: run cron daemon
# Description: cron is a standard UNIX program that runs user-specified
#              programs at periodic scheduled times. vixie cron adds a
#              number of features to the basic UNIX cron, including better
#              security and more powerful configuration options.
### END INIT INFO

CROND=/usr/sbin/crond
CONFIG=/etc/sysconfig/crond

[ -f $CONFIG ] || exit 1
[ -x $CROND ] || exit 1

. $CONFIG

# Source function library.
. /etc/init.d/functions

case "$1" in
  start)
    echo -n "Starting crond: "
    start-stop-daemon --start --quiet --exec $CROND -- $CRONDARGS
    RETVAL=$?
    if [ $RETVAL -eq 0 ] ; then
        echo "OK"
    else
        echo "FAIL"
    fi
    ;;
  stop)
    echo -n "Stopping crond: "
    start-stop-daemon --stop --quiet --pidfile /var/run/crond.pid
    RETVAL=$?
    if [ $RETVAL -eq 0 ] ; then
        echo "OK"
    else
        echo "FAIL"
    fi
    ;;
  status)
    status crond
    exit $?
    ;;
  restart)
    $0 stop && sleep 1 && $0 start
    ;;
  *)
    echo "Usage: /etc/init.d/crond {start|stop|status|restart}"
    exit 1
esac

exit 0

直接 start crond 看看

root@Cellular Router:~# /etc/init.d/crond start
Starting crond: /var/spool/cron: No such file or directory
/var/spool/cron: mkdir: No such file or directory
FAIL

1530

目前 /var/spool 被 link 到的地方還未存在

root@Cellular Router:/var/log# ls -al /var/
drwxr-xr-x   11 root     root          1448 Jul 18 05:38 .
drwxr-xr-x   17 root     root          1248 Jul 16 09:20 ..
lrwxrwxrwx    1 root     root            20 Jul 18 05:38 spool -> /tmp/icos/smtp/spool

先使用 mkdir -p /tmp/icos/smtp/spool 把該地方建立出來

/etc/init.d/crond start 便可執行

科普一下 crontab 熟悉一下使用方式