Ubuntu

/home/*/log/*log {
    hourly
    rotate 2
    dateext
    missingok
    notifempty
    create 0644 root webmasters
    sharedscripts
    postrotate
    size 3M
        kill -USR1 `cat /usr/local/nginx/logs/nginx.pid`
    endscript
}

# see "man logrotate" for details
# rotate log files daily
daily

# keep 4 weeks worth of backlogs
rotate 4

# create new (empty) log files after rotating old ones
create 0644 webmasters

# uncomment this if you want your log files compressed
#compress

# packages drop log rotation information into this directory
include /etc/logrotate.d

# no packages own wtmp, or btmp -- we'll rotate them here
/var/log/wtmp {
    missingok
    monthly
    create 0664 root utmp
    rotate 1
}

/var/log/btmp {
    missingok
    monthly
    create 0664 root utmp
    rotate 1
}

# system-specific logs may be configured here

logrotate -d /etc/logrotate.conf # run in debug mode
logrotate -v /etc/logrotate.conf # run with verbose messages

/home/*/log/*log {
[...]
    create 0644 root webmasters
    sharedscripts
    postrotate
    size 3M
        kill -USR1 `cat /usr/local/nginx/logs/nginx.pid`
    endscript
}

[...]
# This doesn't belong in the global configuration, but in the
# per-log rules.
# create new (empty) log files after rotating old ones
create 0644 webmasters