linux问题总结

MEI

1.修改redhat enterprise5 语言

问题描述：切换语言

cd /etc/sysconfig vi i18n 将LANG=en_US.UTF-8 改成LANG=zh_CN.gb2312

2.bash: ifconfig: command not found

问题描述：

切换到root用户下
[root@localhost /]$ ifconfig
依然提示：“bash: ifconfig: command not found”

whereis ifconfig 看一下这个命令在哪个目录下 方法一：[root@localhost sbin]$ /sbin/ifconfig 就可以出现使用了 方法二：[root@localhost sbin]$ export PATH=$PATH:/sbin 这样设置后，下次就可以直接访问了，免处第一种的麻烦 方法三:修改/etc/profile文件,注释掉if语句即可 把下面的if语句注释掉： # Path manipulation if [ "$EUID" = "0" ]; then pathmunge /sbin pathmunge /usr/sbin pathmunge /usr/local/sbin fi 修改为 # Path manipulation # if [ "$EUID" = "0" ]; then pathmunge /sbin pathmunge /usr/sbin pathmunge /usr/local/sbin #fi

3. redhat linux开机就进入到命令行

vi /etc/inittab id:5:initdefault: 把这一句里面的5改成3就

4. redhat安装JDK失败

在 red hat enterprise linux5安装 jdk-7u21-linux-i586.tar.gz 时候出现下面的错误 ：

Error: dl failure on line 864 Error: failed /home/jiangyang/jdk1.7.0_21/jre/lib/i386/client/libjvm.so, because /home/jiangyang/jdk1.7.0_21/jre/lib/i386/client/libjvm.so: cannot restore segment prot after reloc: Permission denied

解决方案：

chcon -t textrel_shlib_t $JAVA_HOME/jre/lib/i386/client/libjvm.so

5. 设置mysql远程连接root权限

mysql> Grant all privileges on *.* to 'root'@'%' identified by '密码' with grant option; (%表示是所有的外部机器，如果指定某一台机，就将%改为相应的机器名；‘root’则是指要使用的用户名，) mysql> flush privileges; (运行此句才生效，或者重启MySQL)

6. ubuntu 配置静态IP

root@ubuntu1:~# vi /etc/network/interfaces

# This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5). # The loopback network interface auto lo iface lo inet loopback # The primary network interface auto eth0 iface eth0 inet static address 192.168.2.111 netmask 255.255.255.0 gateway 192.168.2.1

root@ubuntu1:~# /etc/init.d/networking restart

如果配置动态IP如下：

# This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5). # The loopback network interface auto lo iface lo inet loopback # The primary network interface auto eth0 iface eth0 inet dhcp

7Ubuntu 安装 chkconfig

在Ubuntu中是没有chkconfig命令，通过安装chkconfig_11.0-79.1-2_all.deb来达到使用chkconfig命令的目的。

8.ubuntu mysql安装

安装mysql-6.0.7-alpha-linux-i686-glibc23.tar.gz版本的linux。

groupadd mysql useradd -g mysql mysql cd /usr/local gunzip < /path/to/mysql-VERSION-OS.tar.gz | tar xvf - ln -s full-path-to-mysql-VERSION-OS mysql cd mysql chown -R mysql . chgrp -R mysql . scripts/mysql_install_db --user=mysql chown -R root . chown -R mysql data bin/mysqld_safe --user=mysql & /usr/local/mysql/bin/mysqladmin -u root password ‘新密码’ cp support-files/mysql.server /etc/init.d/mysql chmod +x /etc/rc.d/init.d/mysql chkconfig --add mysql cp support-files/my-medium.cnf /etc/my.cnf service mysql start

9. linux下的mysql乱码

在linux下中使用mysql的话可能会出现中午乱码的情况。通过查询mysql的编码集可以发现是使用的latin1需要修改。

修改/etc/my.cnf配置文件。

# The following options will be passed to all MySQL clients [client] #password = your_password port = 3306 socket = /tmp/mysql.sock default-character-set=utf8 # Here follows entries for some specific programs # The MySQL server [mysqld] port = 3306 socket = /tmp/mysql.sock skip-locking key_buffer = 16M max_allowed_packet = 1M table_cache = 64 sort_buffer_size = 512K net_buffer_length = 8K read_buffer_size = 256K read_rnd_buffer_size = 512K myisam_sort_buffer_size = 8M default-character-set=utf8

重启数据库后再次查看数据库的编码集信息。

/etc/init.d/mysql stop /etc/init.d/mysql start