Question

我写了一个bash脚本，当它挂起并向管理员发送电子邮件时重启Apache。代码如下所示。如果Apache进程的数量为零，代码将重新启动Apache。问题是：Apache有时挂起，进程仍然不为零，所以在这种情况下脚本不会重启Apache。需要的是：如果挂起并且进程不为零，我如何修改代码以重启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

我们曾经有时在机器上进行Apache segfaulting;这是我们用来尝试调试问题同时保持Apache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

我们从未弄清楚问题......

Answer 2

进程计数真的可以小于零吗？

这应该足够了：

if ! pgrep apache2 -c >/dev/null; then

Answer 3

您可以尝试向apache发送http请求（例如使用wget --timeout=10），如果该请求超时或失败（退出状态！= 0），则终止并重新启动apache。

Answer 4

为什么Apache会挂起？你能找到原因吗？

有许多脚本和工具可以“守护”应用程序并监视它们。正如您在Debian或Ubuntu上看到的那样，请查看包daemon和daemontools。我相信还有其他人。

bash脚本自动重启Apache

4 个答案: