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Stefan Profanter
Asked: 2013-06-06 10:49:30 +0800 CST

Force apache start after mysql

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I have the problem that my apache2 doesn't start at boot. After debugging I found out that a webpage init script tried to connect to MySQL which isn't running at that time.

My OS is Ubuntu Server 10.04.4

apache2 boot is set up using update-rc.d apache2 defaults 21 which creates the scripts in /etc/rcX:

root@ser:~# find /etc/rc* -name *apache*
/etc/rc0.d/K21apache2
/etc/rc1.d/K21apache2
/etc/rc2.d/S21apache2
/etc/rc3.d/S21apache2
/etc/rc4.d/S21apache2
/etc/rc5.d/S21apache2
/etc/rc6.d/K21apache2

and calls /etc/init.d/apache2

mysql is getting started by Ubuntu's upstart:

root@ser:~# ls /etc/init | grep mysql
mysql.conf

How can I force apache2 to start AFTER mysql?

Update:

Since I got already a few comments, here a clarification:

Apache is started as a sysvinit script under /etc/rc*.d/ whereas mysql is an upstart script under /etc/init/. Mysql isn't listed under /etc/rc*.d and thus I can't change the priority by changing the alphabetical order!

apache-2.2

1 Answers

  1. Best Answer

    To answer my own question:

    Here is a quick and dirty way to block the apache script until mysqld is started:

    Replace the two lines in /etc/init.d/apache2 

     log_daemon_msg "Starting web server" "apache2"
 if $APACHE2CTL start; then

    with 

    log_daemon_msg "Starting web server" "apache2"

# wait until mysql started
MYSQL_OK=0
WHILE_CNT=0
while [ "$WHILE_CNT" -le 60 ] ; do
        if [[ `service mysql status` == *running* ]]; then
          MYSQL_OK=1;
          break;
        fi
        WHILE_CNT=`expr $WHILE_CNT + 1`;
   sleep 1
done

if $APACHE2CTL start; then

    This checks every one second if mysql is running (maximum check time is 60 seconds).

    But there should be a better way to defince dependencies between sysvinit and upstart services?!

    • 2