问题1：
[root@Tony_ts_tian bin]# mysqladmin -uroot password 'kaka123'
mysqladmin: connect to server at 'localhost' failed
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)'
[root@Tony_ts_tian bin]# mysql
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)
[root@Tony_ts_tian bin]# mysql -u root -p
Enter password:
ERROR 1045 (28000): Access denied for user 'root'@'localhost'(using password: YES)
问题1.1：
发现mysql数据库下user表中，Host和User为两个主键列。
mysql> update user set host='%' where user='root';
ERROR 1062 (23000): Duplicate entry '%-root' for key 'PRIMARY'
解决1 （7：忘记密码）：
[root@Tony_ts_tian bin]# service mysqld stop
Shutting down MySQL.. SUCCESS!
[root@Tony_ts_tian bin]# mysqld_safe --user=root --skip-grant-tables --skip-networking &
[1] 30273
[root@Tony_ts_tian bin]# 151013 15:40:40 mysqld_safe Logging to '/var/lib/mysql/Tony_ts_tian.err'.
151013 15:40:40 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
注：--skip-grant-tables 启动mysql时不启动grant-tables，授权表
--skip-networking关闭MySQL的TCP/IP连接方式，跳过网络
注：不要关闭上个终端，再次打开一个终端。
执行以下指令:
root@Tony_ts_tian init.d]# mysql -u root
mysql> use mysql
mysql> UPDATE user SET Password=PASSWORD('kaka321') where USER='root';
mysql> flush privileges;
mysql> quit
[root@Tony_ts_tian bin]# service mysqld start
[root@Tony_ts_tian bin]# service mysqld restart
[root@Tony_ts_tian bin]# mysql -u root -p
Enter password:
………………ok.
或者：
UPDATE `user` SET Host='%' WHERE Host='127.0.0.1' AND User='root'
注：也可使用：/etc/mysql/debian.cnf文件中[client]下配置的密码。
问题2：
mysql> use mysql
ERROR 1820 (HY000): You must SET PASSWORD before executing this statement
解决2：
mysql> SET PASSWORD = PASSWORD('kaka321');
Query OK, 0 rows affected (0.00 sec)
修改后继续使用。
问题3：
mysql> INSERT INTO mysql.user(Host,User,Password) VALUES("10.155.123.55","kaka",PASSWORD("kaka123"));
ERROR 1364 (HY000): Field 'ssl_cipher' doesn't have a default value
mysql> INSERT INTO mysql.user(Host,User,Password,ssl_cipher) VALUES("10.155.123.55","kaka",PASSWORD("kaka123"),"");
ERROR 1364 (HY000): Field 'x509_issuer' doesn't have a default value
mysql> INSERT INTO mysql.user(Host,User,Password,ssl_cipher,x509_issuer) VALUES("10.155.123.55","kaka",PASSWORD("kaka123"),"","");
ERROR 1364 (HY000): Field 'x509_subject' doesn't have a default value
mysql> INSERT INTO mysql.user(Host,User,Password,ssl_cipher,x509_issuer) VALUES("10.155.123.55","kaka",PASSWORD("kaka123"),"","");
ERROR 1364 (HY000): Field 'x509_subject' doesn't have a default value
解决3：
mysql> INSERT INTO mysql.user(Host,User,Password,ssl_cipher,x509_issuer,x509_subject) VALUES("10.155.123.55","kaka",PASSWORD("kaka123"),"","","");
Query OK, 1 row affected (0.03 sec)
问题4：
ERROR 1044 (42000): Access denied for user ''@'localhost' to database 'weloveshare'
解决4：
[root@Tony_ts_tian bin]# mysql -u root -p;
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 7
Server version: 5.1.73 Source distribution
Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> 密码正确，就可以登录了.
问题5：
C compiler on this system is: cc
Cannot find appropriate C++ compiler on this system.
configure: error: no acceptable C compiler found in $PATH
解决5：
apt-get install gcc build-essential
问题6：
configure: error: no acceptable m4 could be found in $PATH.
解决6：
ftp://ftp.gnu.org/gnu/m4/
apt-get install m4
问题7：
make[1]: *** [sql/CMakeFiles/sql.dir/all] Error 2
ubuntu version: Ubuntu 14.04 LTS
解决7：
1：要么磁盘存储空间不足，一版5.6的大概30G左右！
2：安装：
apt-get install bison
问题8：
make && make install
The program 'make' is currently not installed. You can install it by typing:
解决8：
apt-get install make
问题9：
mysql启动失败！
root@server:/usr/local/mysql/support-files# ./mysql.server start
Starting MySQL
... * The server quit without updating PID file (/data/mysql.pid).
解决9：
1：my.cnf 配置文件配置错误！参考！
2：安装完后，可能重启下系统，可选建议！
3：mysql源码编译问题！
