MySQL读取my.cnf的顺序问题详情

basedir=/opt/mysql/mysql3315
datadir=/opt/mysql/mysql3315/data

/opt/mysql/mysql3315/bin/my_print_defaults -e /opt/mysql/mysql3315/my.cnf mysqld server mysql_server mysql.server

if test -z "$mysqld_pid_file_path"
then
  mysqld_pid_file_path=$datadir/`hostname`.pid
else
  case "$mysqld_pid_file_path" in
    /* ) ;;
    * )  mysqld_pid_file_path="$datadir/$mysqld_pid_file_path" ;;
  esac
fi

/opt/mysql/mysql3315/bin/mysqld_safe --datadir=/opt/mysql/mysql3315/data/ --pid-file=/opt/mysql/mysql3315/data//mgr4.pid

/opt/mysql/mysql3315/bin/my_print_defaults mysqld server mysql_server mysql.server

nohup /opt/mysql/mysql3315/bin/mysqld --basedir=/opt/mysql/mysql3315 --datadir=/opt/mysql/mysql3315/data 
--plugin-dir=/opt/mysql/mysql3315/lib/plugin --user=mysql 
--log-error=/opt/mysql/mysql3315/logs/mysql3315.err --pid-file=/opt/mysql/mysql3315/data//mgr4.pid 
--socket=/opt/mysql/mysql3315/data/mysql3315.sock --port=3315

while true
do
  echo 1
  start_time=`date +%M%S`
  eval_log_error "$cmd"

if [ -n "$mysqld_ld_library_path" ]; then
  new_text="$mysqld_ld_library_path"
  [ -n "$LD_LIBRARY_PATH" ] && new_text="$new_text:$LD_LIBRARY_PATH"
  text="${text}LD_LIBRARY_PATH="`shell_quote_string "$new_text"`' '
fi

```
/home/work/ssd1/mysql/install/bin/mysqld_safe —defaults-file=/home/work/ssd1/mysql/etc/3307/my.cnf —socket=/home/work/ssd1/mysql/sock/3307/mysql.sock —datadir=/home/work/ssd1/mysql/data/3307 —user=mysql &

/opt/mysql/mysql3320/install/bin/my_print_defaults —defaults-file=/home/work/ssd1/mysql/etc/3307/my.cnf —loose-verbose mysqld server