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针对Linux系统自带Mysql 数据库不能使用的情况,可能是在安装过程有没有安装mysql server 安装时即使选了安装MYSQL(图形界面安装),只有打开旁边“细节”,从里面勾选选上server才可以。安装完成后在/usr/bin 目录下会生成许多MySQL的相关文件,其中有一个名为mysqld_safe 启动服务的脚本文件,执行这个脚本文件后,发现错误"/var/lib/mysql/mysql.sock" 查看mysql服务才发现,没有起来,于是执行/etc/init.d/mysqld start,启动服务后,在/usr/bin 执行mysql 成功进入数据库![pan@localhost ~]$ su – root Password:[root@localhost ~]# cd /usr/bin [root@localhost bin]# ./mysqld_safe --user=root &[1] 12969[root@localhost bin]# Starting mysqld daemon with databases from /var/lib/mysqlSTOPPING server from pid file /var/run/mysqld/mysqld.pid090606 15:20:04 mysqld endedmysqlERROR 2002 (HY000): Can"t connect to local MySQL server through socket "/var/lib/mysql/mysql.sock" (2)[1]+ Done                    ./mysqld_safe --user=root[root@localhost bin]# mysqlERROR 2002 (HY000): Can"t connect to local MySQL server through socket "/var/lib/mysql/mysql.sock" (2)[root@localhost bin]# /etc/rc.d/init.d/mysqld statusmysqld is stopped[root@localhost bin]# /etc/init.d/mysqld start (或者service mysqld restart,而service mysqld stop 停止mysql的服务)Initializing MySQL database:                               [ OK ]Starting MySQL:                                            [ OK ][root@localhost bin]# mysqlWelcome to the MySQL monitor. Commands end with ; or g.Your MySQL connection id is 2 to server version: <?XML:NAMESPACE PREFIX = ST1 />4.1.22Type "help;" or "h" for help. Type "c" to clear the buffer.mysql>现在进行环境变量的配置,可以针对用户配置用户的环境变量,以root用户例,[root@localhost bin]# cd[root@localhost ~]# ls –a .bash_profile 是个隐藏文件,所以要-a. Desktop          .gstreamer-0.8      .mozilla..               .dmrc            .gtkrc              .mysql_historyanaconda-ks.cfg .eggcups         .gtkrc-1.2-gnome2   .nautilus.bash_history    .fullcircle      .ICEauthority       .recently-used.bash_logout     .gconf           .icons              .rhn-applet.conf.bash_profile    .gconfd          install.log         .tcshrc.bashrc          .gnome           install.log.syslog .viminfo.config          .gnome2          .kde                .xauthC1s54N.cshrc           .gnome2_private .metacity           .xautheKBniS[root@localhost ~]# vi .bash_profile (进行修改)# .bash_profile# Get the aliases and functionsif [ -f ~/.bashrc ]; then        . ~/.bashrcfi# User specific environment and startup programsPATH=$PATH:$HOME/bin:/usr/bin (此处添加注意冒号)export PATHunset USERNAME[root@localhost ~]# source .bash_profile (更新一下配置文件)也可以针对系统环境配置,如下:[root@localhost ~]# vi /etc/profile# /etc/profile# System wide environment and startup programs, for login setup# Functions and aliases go in /etc/bashrcpathmunge () {        if ! echo $PATH | /bin/egrep -q "(^|:)$1($|:)" ; then           if [ "$2" = "after" ] ; then             PATH=$PATH:$1           else              PATH=$1:$PATH           fi        fi}# Path manipulationif [ `id -u` = 0 ]; then        pathmunge /sbin        pathmunge /usr/sbin        pathmunge /usr/local/sbin        pathmunge /usr/binfiRHEL AS 5 X86_64如何卸载Oracle 10g红旗Asianux3下Oracle 10g无法启动解决相关资讯      mysql 
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