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my.cnf 值不适用 - 在 centos Lamp 上优化 mysql

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my.cnf 值不适用 - 在 centos Lamp 上优化 mysql

我检查了 my.cnf 的其他出现情况，只发现一次出现 /etc/my.cnf。

然后我继续修复我的值，例如query_cache_size等等。

保存并重新启动后，my.cnf 中的值尚未应用。我使用的是 centos 5.6、apache 2 上的 LAMP、mysql 5.0.77

有什么帮助吗？

这是 /etc/init.d/mysyld 的内容

#!/bin/bash
#
# mysqld    This shell script takes care of starting and stopping
#       the MySQL subsystem (mysqld).
#
# chkconfig: - 64 36
# description:  MySQL database server.
# processname: mysqld
# config: /etc/my.cnf
# pidfile: /var/run/mysqld/mysqld.pid

# Source function library.
. /etc/rc.d/init.d/functions

# Source networking configuration.
. /etc/sysconfig/network


prog="MySQL"

# extract value of a MySQL option from config files
# Usage: get_mysql_option SECTION VARNAME DEFAULT
# result is returned in $result
# We use my_print_defaults which prints all options from multiple files,
# with the more specific ones later; hence take the last match.
get_mysql_option(){
    result=`/usr/bin/my_print_defaults "$1" | sed -n "s/^--$2=//p" | tail -n 1`
    if [ -z "$result" ]; then
        # not found, use default
        result="$3"
    fi
}

get_mysql_option mysqld datadir "/var/lib/mysql"
datadir="$result"
get_mysql_option mysqld socket "$datadir/mysql.sock"
socketfile="$result"
get_mysql_option mysqld_safe log-error "/var/log/mysqld.log"
errlogfile="$result"
get_mysql_option mysqld_safe pid-file "/var/run/mysqld/mysqld.pid"
mypidfile="$result"

start(){
    touch "$errlogfile"
    chown mysql:mysql "$errlogfile" 
    chmod 0640 "$errlogfile"
    [ -x /sbin/restorecon ] && /sbin/restorecon "$errlogfile"
    if [ ! -d "$datadir/mysql" ] ; then
        action $"Initializing MySQL database: " /usr/bin/mysql_install_db --datadir="$datadir" --user=mysql
        ret=$?
        chown -R mysql:mysql "$datadir"
        if [ $ret -ne 0 ] ; then
        return $ret
        fi
    fi
    chown mysql:mysql "$datadir"
    chmod 0755 "$datadir"
    # Pass all the options determined above, to ensure consistent behavior.
    # In many cases mysqld_safe would arrive at the same conclusions anyway
    # but we need to be sure.
    /usr/bin/mysqld_safe   --datadir="$datadir" --socket="$socketfile" \
        --log-error="$errlogfile" --pid-file="$mypidfile" \
        --user=mysql >/dev/null 2>&1 &
    ret=$?
    # Spin for a maximum of N seconds waiting for the server to come up.
    # Rather than assuming we know a valid username, accept an "access
    # denied" response as meaning the server is functioning.
    if [ $ret -eq 0 ]; then
        STARTTIMEOUT=30
        while [ $STARTTIMEOUT -gt 0 ]; do
        RESPONSE=`/usr/bin/mysqladmin --socket="$socketfile" --user=UNKNOWN_MYSQL_USER ping 2>&1` && break
        echo "$RESPONSE" | grep -q "Access denied for user" && break
        sleep 1
        let STARTTIMEOUT=${STARTTIMEOUT}-1
        done
        if [ $STARTTIMEOUT -eq 0 ]; then
                    echo "Timeout error occurred trying to start MySQL Daemon."
                    action $"Starting $prog: " /bin/false
                    ret=1
            else
                    action $"Starting $prog: " /bin/true
            fi
    else
            action $"Starting $prog: " /bin/false
    fi
    [ $ret -eq 0 ] && touch /var/lock/subsys/mysqld
    return $ret
}

stop(){
        MYSQLPID=`cat "$mypidfile"  2>/dev/null `
        if [ -n "$MYSQLPID" ]; then
            /bin/kill "$MYSQLPID" >/dev/null 2>&1
            ret=$?
            if [ $ret -eq 0 ]; then
                STOPTIMEOUT=60
                while [ $STOPTIMEOUT -gt 0 ]; do
                    /bin/kill -0 "$MYSQLPID" >/dev/null 2>&1 || break
                    sleep 1
                    let STOPTIMEOUT=${STOPTIMEOUT}-1
                done
                if [ $STOPTIMEOUT -eq 0 ]; then
                    echo "Timeout error occurred trying to stop MySQL Daemon."
                    ret=1
                    action $"Stopping $prog: " /bin/false
                else
                    rm -f /var/lock/subsys/mysqld
                    rm -f "$socketfile"
                    action $"Stopping $prog: " /bin/true
                fi
            else
                action $"Stopping $prog: " /bin/false
            fi
        else
            ret=1
            action $"Stopping $prog: " /bin/false
        fi
        return $ret
}

restart(){
    stop
    start
}

condrestart(){
    [ -e /var/lock/subsys/mysqld ] && restart || :
}

# See how we were called.
case "$1" in
  start)
    start
    ;;
  stop)
    stop
    ;;
  status)
    status mysqld
    ;;
  restart)
    restart
    ;;
  condrestart)
    condrestart
    ;;
  *)
    echo $"Usage: $0 {start|stop|status|condrestart|restart}"
    exit 1
esac

exit $?

答案1

我修复了这个错误。这是一个权限问题。显然，my.cnf 需要被 mysql 更改所有权才能读取。只需使用

chown mysql:mysql /etc/my.cnf
chmod 0640 /etc/my.cnf

答案2

需要检查的一件事是 MySQL 的 init.d 脚本（/etc/init.d/mysqld），并检查指定要加载哪个配置文件（如果有）。

另一种可能的测试方法是尝试在启动脚本之外运行 MySQL 实例，mysqld_safe --datadir=/var/lib/mysql --defaultsfile=/etc/my.cnf并检查设置是否生效。

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