Re: is there a reason for starting zookeeper.service in background?

[Reindl Harald <h.reindl@xxxxxxxxxxxxx>]

Am 12.01.2016 um 15:45 schrieb Lennart Poettering:
> On Tue, 12.01.16 10:22, Muayyad AlSadi (alsadi@xxxxxxxxx) wrote:
>
> > @Lennart Poettering is there a way to use something like "ExecStartPost="
> > do the the notify with type=simple?
>
> When would you even call that? Somehow your Java app needs to report
> when it finished setting up its listening socket. You cannot script
> around that fact

at the same point as for mariadb /  mysql

[Service]
Type=simple
User=mysql
Group=mysql
ExecStart=/usr/libexec/mysqld --defaults-file=/etc/my.cnf 
--pid-file=/dev/null
ExecStartPost=/usr/libexec/mysqld-wait-ready $MAINPID
_____________________________________

[root@rh:~]$ cat /usr/libexec/mysqld-wait-ready
#!/usr/bin/bash

# Service file passes us the daemon's PID
daemon_pid="$1"

# Wait for the server to come up or for the mysqld process to disappear
ret=0
while /usr/bin/true; do
 RESPONSE=`/usr/bin/mysqladmin --defaults-file=/etc/my.cnf 
--socket=/var/lib/mysql/mysql.sock --user=UNKNOWN_MYSQL_USER ping 2>&1`
 mret=$?
 if [ $mret -eq 0 ]; then
  break
 fi
 # exit codes 1, 11 (EXIT_CANNOT_CONNECT_TO_SERVICE) are expected,
 # anything else suggests a configuration error
 if [ $mret -ne 1 -a $mret -ne 11 ]; then
  ret=1
  break
 fi
 # "Access denied" also means the server is alive
 echo "$RESPONSE" | grep -q "Access denied for user" && break

 # Check process still exists
 if ! /usr/bin/kill -0 $daemon_pid 2>/dev/null; then
  ret=1
  break
 fi
 usleep 100000
done

exit $ret

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