apache - 自动重启 Apache 的 bash 脚本

Question

我写了一个 bash 脚本来在 Apache 挂起时重新启动它并向管理员发送电子邮件。代码如下所示。如果 Apache 进程数为零，代码将重新启动 Apache。问题是:Apache 有一段时间挂起并且进程仍然不为零，所以在这种情况下脚本不会重新启动 Apache。需要的是:如果它挂起并且进程不为零，我如何修改代码以重新启动 Apache。

#!/bin/bash
if [ `pgrep apache2 -c` -le "0" ]; then
/etc/init.d/apache2 stop
pkill -u www-data  
/etc/init.d/apache2 start
 echo "restarting....."
SUBJECT="Apache auto restart"
# Email To ?
EMAIL="me@mydomain.com"
# Email text/message
EMAILMESSAGE="apache auto restart done"
# send an email using /bin/mail
/bin/mail -s "$SUBJECT" "$EMAIL" "$EMAILMESSAGE"
fi

Answer 1

我们以前有时会在机器上出现 Apache 段错误；这是我们在保持 Apache 正常运行的同时尝试调试问题的脚本。它每分钟左右从 cron(作为 root)运行一次。它应该是不言自明的。

#!/bin/sh
# Script that checks whether apache is still up, and if not:
# - e-mail the last bit of log files
# - kick some life back into it
# -- Thomas, 20050606

PATH=/bin:/usr/bin
THEDIR=/tmp/apache-watchdog
EMAIL=yourself@example.com
mkdir -p $THEDIR

if ( wget --timeout=30 -q -P $THEDIR http://localhost/robots.txt )
then
    # we are up
    touch ~/.apache-was-up
else
    # down! but if it was down already, don't keep spamming
    if [[ -f ~/.apache-was-up ]]
    then
        # write a nice e-mail
        echo -n "apache crashed at " > $THEDIR/mail
        date >> $THEDIR/mail
        echo >> $THEDIR/mail
        echo "Access log:" >> $THEDIR/mail
        tail -n 30 /var/log/apache2_access/current >> $THEDIR/mail
        echo >> $THEDIR/mail
        echo "Error log:" >> $THEDIR/mail
        tail -n 30 /var/log/apache2_error/current >> $THEDIR/mail
        echo >> $THEDIR/mail
        # kick apache
        echo "Now kicking apache..." >> $THEDIR/mail
        /etc/init.d/apache2 stop >> $THEDIR/mail 2>&1
        killall -9 apache2 >> $THEDIR/mail 2>&1
        /etc/init.d/apache2 start >> $THEDIR/mail 2>&1
        # send the mail
        echo >> $THEDIR/mail
        echo "Good luck troubleshooting!" >> $THEDIR/mail
        mail -s "apache-watchdog: apache crashed" $EMAIL < $THEDIR/mail
        rm ~/.apache-was-up
    fi
fi

rm -rf $THEDIR

我们从来没有弄清楚问题...