MYsql 資料庫密碼忘記（Linux）

標籤：

在Linux 上面裝上了 Mysql 資料庫，但是發現密碼忘了，悲催，解決方案跟Window系統下一樣的， 不管是哪個作業系統處理的思路是相同的，就是首先要把mysql的許可權去掉，這樣即使忘了密碼，不使用密碼，照樣可以進入，

但是window 和linux 在 屏蔽mysql許可權方面稍有不同；這個方法適用於 忘記密碼，或是剛開始安裝mysql ，還沒有密碼，需要設定密碼的情況； 網上查了一下使用：mysqladmin -u root -p password 123456可以修改這是我執行後的錯誤：   ‘Access denied; you need (at least one of) the SUPER privilege(s) for this operation‘  開始解決；

 進入Linux 操作介面：
1.關閉mysql
# service mysqld stop
2.屏蔽許可權

 修改MySQL的登入設定 進入mysql 在linux底下的預設安裝路徑，找到 my.cnf檔案：
# vi /etc/my.cnf
--windows系統是my.ini檔案
--在[mysqld]的段中加上一句：skip-grant-tables，如沒有[mysqld]欄位，可手動添加上
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
skip-name-resolve
skip-grant-tables  （這是我加的）

下面是我的設定檔 其中只是多加了一句 話：skip-grant-tables 

# Example MySQL config file for medium systems.## This is for a system with little memory (32M - 64M) where MySQL plays# an important part, or systems up to 128M where MySQL is used together with# other programs (such as a web server)## MySQL programs look for option files in a set of# locations which depend on the deployment platform.# You can copy this option file to one of those# locations. For information about these locations, see:# http://dev.mysql.com/doc/mysql/en/option-files.html## In this file, you can use all long options that a program supports.# If you want to know which options a program supports, run the program# with the "--help" option.# The following options will be passed to all MySQL clients[client]#password    = your_passwordport        = 3306socket        = /tmp/mysql.sock# Here follows entries for some specific programs# The MySQL server[mysqld]port        = 3306socket        = /tmp/mysql.sockskip-external-lockinglog-error=/alidata/log/mysql/error.logkey_buffer_size = 16Mmax_allowed_packet = 1Mtable_open_cache = 64sort_buffer_size = 512Knet_buffer_length = 8Kread_buffer_size = 256Kread_rnd_buffer_size = 512Kmyisam_sort_buffer_size = 8Mskip-grant-tables# Don‘t listen on a TCP/IP port at all. This can be a security enhancement,# if all processes that need to connect to mysqld run on the same host.# All interaction with mysqld must be made via Unix sockets or named pipes.# Note that using this option without enabling named pipes on Windows# (via the "enable-named-pipe" option) will render mysqld useless!# #skip-networking# Replication Master Server (default)# binary logging is required for replicationlog-bin=mysql-bin# binary logging format - mixed recommendedbinlog_format=mixed# required unique id between 1 and 2^32 - 1# defaults to 1 if master-host is not set# but will not function as a master if omittedserver-id    = 1# Replication Slave (comment out master section to use this)## To configure this host as a replication slave, you can choose between# two methods :## 1) Use the CHANGE MASTER TO command (fully described in our manual) -#    the syntax is:##    CHANGE MASTER TO MASTER_HOST=<host>, MASTER_PORT=<port>,#    MASTER_USER=<user>, MASTER_PASSWORD=<password> ;##    where you replace <host>, <user>, <password> by quoted strings and#    <port> by the master‘s port number (3306 by default).##    Example:##    CHANGE MASTER TO MASTER_HOST=‘125.564.12.1‘, MASTER_PORT=3306,#    MASTER_USER=‘joe‘, MASTER_PASSWORD=‘secret‘;## OR## 2) Set the variables below. However, in case you choose this method, then#    start replication for the first time (even unsuccessfully, for example#    if you mistyped the password in master-password and the slave fails to#    connect), the slave will create a master.info file, and any later#    change in this file to the variables‘ values below will be ignored and#    overridden by the content of the master.info file, unless you shutdown#    the slave server, delete master.info and restart the slaver server.#    For that reason, you may want to leave the lines below untouched#    (commented) and instead use CHANGE MASTER TO (see above)## required unique id between 2 and 2^32 - 1# (and different from the master)# defaults to 2 if master-host is set# but will not function as a slave if omitted#server-id       = 2## The replication master for this slave - required#master-host     =   <hostname>## The username the slave will use for authentication when connecting# to the master - required#master-user     =   <username>## The password the slave will authenticate with when connecting to# the master - required#master-password =   <password>## The port the master is listening on.# optional - defaults to 3306#master-port     =  <port>## binary logging - not required for slaves, but recommended#log-bin=mysql-bin# Uncomment the following if you are using InnoDB tables#innodb_data_home_dir = /usr/local/mysql/data#innodb_data_file_path = ibdata1:10M:autoextend#innodb_log_group_home_dir = /usr/local/mysql/data# You can set .._buffer_pool_size up to 50 - 80 %# of RAM but beware of setting memory usage too high#innodb_buffer_pool_size = 16M#innodb_additional_mem_pool_size = 2M# Set .._log_file_size to 25 % of buffer pool size#innodb_log_file_size = 5M#innodb_log_buffer_size = 8M#innodb_flush_log_at_trx_commit = 1#innodb_lock_wait_timeout = 50[mysqldump]quickmax_allowed_packet = 16M[mysql]no-auto-rehash# Remove the next comment character if you are not familiar with SQL#safe-updates[myisamchk]key_buffer_size = 20Msort_buffer_size = 20Mread_buffer = 2Mwrite_buffer = 2M[mysqlhotcopy]interactive-timeout

my.cnf

 

（3）開啟mysql服務

# service mysqld start;

 

(4) 

[[email protected] ~]# mysql 
mysql> use mysql; 
mysql> update user set password=password(‘new_password‘) where user=‘root‘; 
mysql> flush privileges; 
mysql >exit;

這樣就把密碼修改了，

（5） 改完了密碼之後，需要恢複許可權：把之前對/etc/my.cnf的  skip-grant-tables  刪掉

然後執行  # service mysqld restart；

(6) 然後mysql -u root -p

Enter Password :你的新密碼；

 

就可以了；

 

 

 

MYsql 資料庫密碼忘記（Linux）