Linux Problem Summary

1. Modify Redhat ENTERPRISE5 language

Problem Description: Switching languages

Cd/etc/sysconfig VI i18n Will Lang=en_us. UTF-8 Change into lang=zh_cn.gb2312

2.bash:ifconfig:command not found

Problem Description:

Switch to the root user
[Email protected]/]$ ifconfig
Still tip: "Bash:ifconfig:command not Found"

Whereis ifconfig look at the directory under which this command is Method one: [[email protected] sbin]$/sbin/ifconfig can appear using the Method two: [[email protected] sbin]$ export path= $PATH:/sbin This setting, the next time you can access directly, free of the first kind of trouble Method Three: Modify the/etc/profile file, comment out the IF statement can be Comment out the following if statement: # Path Manipulation If ["$EUID" = "0"]; Then Pathmunge/sbin Pathmunge/usr/sbin Pathmunge/usr/local/sbin Fi Revision changed to # Path Manipulation # if ["$EUID" = "0"]; Then Pathmunge/sbin Pathmunge/usr/sbin Pathmunge/usr/local/sbin #fi

3. Redhat Linux boot to the command line

Vi/etc/inittab Id:5:initdefault: Change the sentence in 5 to 3

4. Redhat installation of JDK failed

The following error occurred while installing jdk-7u21-linux-i586.tar.gz in Red Hat Enterprise linux5:

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

Solution:

Chcon-t textrel_shlib_t $JAVA _home/jre/lib/i386/client/libjvm.so

5. Set MySQL remote connection root permissions

Mysql> Grant all privileges on * * to ' root ' @ '% ' identified by ' Password ' with Grant option; (% means all external machines, if a certain machine is specified, the% is changed to the corresponding machine name; ' root ' means the username to be used.) MySQL> Flush privileges; (Run this sentence to take effect, or restart MySQL)

6. Ubuntu Configuration static IP

[Email protected]:~# 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

[Email protected]:~#/etc/init.d/networking Restart

If you configure dynamic IP as follows:

# 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 Mounting Chkconfig

in Ubuntu , there is no chkconfig command to install Chkconfig_11.0-79.1-2_all.deb to achieve the purpose of using the Chkconfig command.

8.ubuntu MySQL Installation

Install the mysql-6.0.7-alpha-linux-i686-glibc23.tar.gz version of 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 ' new password ' 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. mysql garbled under Linux

If you use MySQL under Linux, you may get garbled at noon. By querying the MySQL encoding set you can find that the latin1 you are using needs to be modified.

Modify the/ETC/MY.CNF configuration file.

 

# The following options would 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 = Sort_buffer_size = 512K Net_buffer_length = 8 k Read_buffer_size = 256K Read_rnd_buffer_size = 512K Myisam_sort_buffer_size = 8M Default-character-set=utf8

Review the encoding set information for the database again after restarting the database.

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