ubuntu安裝mysql 5.7未提示輸入密碼無法登陸的情況
阿新 • • 發佈：2018-12-13
在Ubuntu18.04通過apt-get安裝mysql服務
[email protected]:~$ sudo apt-get install mysql-client-core-5.7
[email protected]:~$ sudo apt-get install mysql-server
安裝完成，中間過程並沒有提示設定mysql的預設密碼。不管了，先用root嘗試登陸mysql試試。
[email protected]:~$ mysql ERROR 1045 (28000): Access denied for user 'ub64'@'localhost' (using password: NO)[email protected]:~$ mysql -u root ERROR 1698 (28000): Access denied for user 'root'@'localhost' [email protected]:~$ mysql -uub64 ERROR 1045 (28000): Access denied for user 'ub64'@'localhost' (using password: NO) [email protected]:~$ mysql -uub64 -p123456 mysql: [Warning] Using a password on the command line interface can be insecure. ERROR 1045 (28000): Access denied for user 'ub64'@'localhost' (using password: YES)
提示報錯了，不管是root還是本機使用者名稱，都無法登陸。測試一下重啟服務吧，還是不行。
[email protected]:~$ service mysql start
==== AUTHENTICATING FOR org.freedesktop.systemd1.manage-units ===
Authentication is required to start 'mysql.service'.
Authenticating as: ub64-1804-1 (ub64)
Password:
==== AUTHENTICATION COMPLETE ===
[email protected] 程序服務執行正常，但是還是登陸不上。祭出百度神器，找到同樣的問題。
好了，開啟conf配置檔案，檢視一下預設設定的賬號密碼
[email protected]:~$ sudo view /etc/mysql/debian.cnf
# Automatically generated for Debian scripts. DO NOT TOUCH!
[client]
host = localhost
user = debian-sys-maint
password = i1OVIwwgMWs8MAKj
socket = /var/run/mysqld/mysqld.sock
[mysql_upgrade]
host = localhost
user = debian-sys-maint
password = i1OVIwwgMWs8MAKj
socket = /var/run/mysqld/mysqld.sock
原來安裝完成後，預設使用的不再是以前的root了，而是使用debian-sys-maint使用者和這一大串隨機密碼，順利登陸。查詢一下現有的使用者情況。
mysql> select host, user, plugin, authentication_string from mysql.user;
+-----------+------------------+-----------------------+-------------------------------------------+
| host | user | plugin | authentication_string |
+-----------+------------------+-----------------------+-------------------------------------------+
| localhost | root | | |
| localhost | mysql.session | mysql_native_password | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE |
| localhost | mysql.sys | mysql_native_password | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE |
| localhost | debian-sys-maint | mysql_native_password | *2D3B703CBCBE5E317141B9EC7FA780ABB991F93E |
+-----------+------------------+-----------------------+-------------------------------------------+
4 rows in set (0.00 sec)
接下來為了使用方便，那就是修改一下預設的root賬號的登陸設定了。由於mysql5.7的密碼儲存在authentication_string欄位中，password()方法設定登陸密碼123456。好吧，雖然不知道什麼意思，但是和debian-sys-maint一樣，修改預設的認證方式為"mysql_native_password"。
mysql> update mysql.user set authentication_string=password('123456') where user='root'and Host = 'localhost';
Query OK, 0 rows affected, 1 warning (0.00 sec)
Rows matched: 1 Changed: 0 Warnings: 1
mysql> update mysql.user set plugin="mysql_native_password" where user='root'and Host = 'localhost';
Query OK, 0 rows affected (0.00 sec)
Rows matched: 1 Changed: 0 Warnings: 0
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
測試使用root使用者登入完成，ok。