CentOS8下MySQL 8.0安装部署的方法

吾爱主题阅读：150 2024-04-01 23:50:56 评论：0

MySQL 8正式版8.0.11已发布，官方表示MySQL8要比MySQL 5.7快2倍，还带来了大量的改进和更快的性能！到底谁最牛呢？请看：MySQL 5.7 vs 8.0，哪个性能更牛？

Mysql8.0安装 (YUM方式)

1、首先删除系统默认或之前可能安装的其他版本的mysql

1 2	`#` `for` `i` `in` `$(rpm -qa\|grep mysql);do rpm -e $i` `--nodeps;done` `# rm -rf /var/lib/mysql && rm -rf /etc/my.cnf`

2、安装Mysql8.0 的yum资源库

1 2 3 mysql80-community-release-el7-1.noarch.rpm # yum localinstall https://repo.mysql.com//mysql80-community-release-el7-1.noarch.rpm

3、安装Mysql8.0

1 2 3 4 5 6 # yum install mysql-community-server #启动MySQL服务器和MySQL的自动启动 # systemctl start mysqld # systemctl enable mysqld # systemctl status mysqld

1 2 3 4 5 6 [root@localhost opt] # netstat -lantp | grep 3306 tcp6 0 0 :::33060 :::* LISTEN 25431 /mysqld tcp6 0 0 :::3306 :::* LISTEN 25431 /mysqld [root@localhost opt] # ps -aux | grep mysqld mysql 25431 0.8 17.2 1776932 350232 ? Ssl 16:24 0:01 /usr/sbin/mysqld root 25672 0.0 0.0 112828 980 pts /1 S+ 16:28 0:00 grep --color=auto mysqld

登录报错

跳过密码登录，添加skip-grant-tables，然后重启MySQL服务。

1 2 3 4 5 6 [root@localhost opt] # vim /etc/my.cnf [mysqld] skip-grant-tables [root@localhost opt] # systemctl restart mysqld [root@localhost opt] # mysql

用sql来修改root的密码

进入到终端当中，敲入 mysql -u root -p 命令然后回车，当需要输入密码时，直接按enter键，便可以不用密码登录到数据库当中

1 2 3 4 5 mysql> update user set password = password ( "你的新密码" ) where user = "root" ; 或者 mysql> set password for 'username' @ 'host' = password ( 'newpassword' ) mysql> flush privileges ; mysql> quit

注意
set password for ‘username'@‘host' = password(‘newpassword') 命令修改新的密码。

如果在执行该步骤的时候出现ERROR 1290 (HY000): The MySQL server is running with the --skip-grant-tables option so it cannot execute this statement 错误。则执行下 flush privileges 命令，再执行该命令即可。

注意：如果在执行该步骤的时候出现ERROR 1290 (HY000): The MySQL server is running with the --skip-grant-tables option so it cannot execute this statement 错误。则执行下 flush privileges 命令，再执行该命令即可。

4、使用默认密码初次登录后, 必须要重置密码

1 2 3 4 5 6 7 8 查看默认密码, 如下默认密码为 "e53xDalx.*dE" [root@DB-node01 ~]# grep 'temporary password' /var/log/mysqld.log 2019-03-06T01:53:19.897262Z 5 [Note] [MY-010454] [Server] A temporary password is generated for root@localhost: e53xDalx.*dE [root@DB-node01 ~]# mysql -pe53xDalx.*dE ............ mysql> select version(); ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.

报错提示必须要重置初始密码, 下面开始重置mysql登录密码（注意要切换到mysql数据库，使用use mysql）

1 2 3 4 5 mysql> use mysql; ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement. mysql> ALTER USER 'root' @ 'localhost' IDENTIFIED BY '123456' ; ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

这个其实与validate_password_policy的值有关, mysql8.0更改了validate_password_policy相关的配置名称, 这跟Mysql5.7有点不一样了.

1 2 3 4 5 mysql> set global validate_password.policy=0; Query OK, 0 rows affected (0.00 sec) mysql> set global validate_password.length=1; Query OK, 0 rows affected (0.00 sec)

接着再修改密码

1 2 3 4 5 mysql> ALTER USER 'root' @ 'localhost' IDENTIFIED BY '123456' ; Query OK, 0 rows affected (0.05 sec) mysql> flush privileges ; Query OK, 0 rows affected (0.03 sec)

退出, 重新使用新密码登录mysql

1 2 3 4 5 6 7 8 9 # mysql -p123456 ........... mysql> select version(); + -----------+ | version() | + -----------+ | 8.0.15 | + -----------+ 1 row in set (0.00 sec)

查看服务端口

查看mysql连接的授权信息

1 2	`mysql>` `select` `host,` `user` `,` `password` `from` `mysql.` `user` `;` `ERROR 1054 (42S22): Unknown` `column` `'password'` `in` `'field list'`

上面这是mysql5.6及以下版本的查看命令, mysql5.7之后的数据库里mysql.user表里已经没有password这个字段了，password字段改成了authentication_string。

1 2 3 4 5 6 7 8 9 10 mysql> select host, user ,authentication_string from mysql. user ; + -----------+------------------+------------------------------------------------------------------------+ | host | user | authentication_string | + -----------+------------------+------------------------------------------------------------------------+ | localhost | mysql.infoschema | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | | localhost | mysql.session | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | | localhost | mysql.sys | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | | localhost | root | $A$005${7J0=4Dc7Jym8eI/FU4jimKWFvkD9XmoAkF1ca5.Un0bc6zgmPtU.0 | + -----------+------------------+------------------------------------------------------------------------+ 4 rows in set (0.00 sec)

mysql8.0修改用户密码命令

1 2 3 mysql> use mysql; mysql> ALTER USER 'root' @ 'localhost' IDENTIFIED BY '123456' ; mysql> flush privileges ;

Mysql8.0安装 (二进制方式)

1、首先删除系统默认或之前可能安装的其他版本的mysql

1 2	`[root@mysql8-node ~]` `# for i in $(rpm -qa\|grep mysql);do rpm -e $i --nodeps;done` `[root@mysql8-node ~]` `# rm -rf /var/lib/mysql && rm -rf /etc/my.cnf`

2、安装需要的软件包

1 2	`[root@mysql8-node ~]` `# yum -y install libaio` `[root@mysql8-node ~]` `# yum -y install net-tools`

3、下载并安装Mysql8.0.12

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 [root@mysql8-node ~] # groupadd mysql [root@mysql8-node ~] # useradd -g mysql mysql [root@mysql8-node ~] # cd /usr/local/src/ [root@mysql-node src] # ll -rw-r--r-- 1 root root 620389228 Aug 22 2018 mysql8.0.12_bin_centos7. tar .gz [root@mysql-node src] # tar -zvxf mysql8.0.12_bin_centos7.tar.gz [root@mysql-node src] # mv mysql /usr/local/ [root@mysql-node src] # chown -R mysql.mysql /usr/local/mysql [root@mysql-node src] # vim /home/mysql/.bash_profile export PATH= /usr/local/mysql/bin : /usr/local/mysql/lib :$PATH [root@mysql-node src] # source /home/mysql/.bash_profile [root@mysql-node src] # echo "PATH=$PATH:/usr/local/mysql/bin" >> /etc/profile [root@mysql-node src] # source /etc/profile

4、创建数据目录

1 2	`[root@mysql-node src]` `# mkdir -p /data/mysql/{data,log,binlog,conf,tmp}` `[root@mysql-node src]` `# chown -R mysql.mysql /data/mysql`

5、配置mysql

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 [root@mysql-node src] # su - mysql [mysql@mysql-node ~]$ vim /data/mysql/conf/my .cnf [mysqld] lower_case_table_names = 1 user = mysql server_id = 1 port = 3306 default- time -zone = '+08:00' enforce_gtid_consistency = ON gtid_mode = ON binlog_checksum = none default_authentication_plugin = mysql_native_password datadir = /data/mysql/data pid- file = /data/mysql/tmp/mysqld .pid socket = /data/mysql/tmp/mysqld .sock tmpdir = /data/mysql/tmp/ skip-name-resolve = ON open_files_limit = 65535 table_open_cache = 2000 #################innodb######################## innodb_data_home_dir = /data/mysql/data innodb_data_file_path = ibdata1:512M;ibdata2:512M:autoextend innodb_buffer_pool_size = 12000M innodb_flush_log_at_trx_commit = 1 innodb_io_capacity = 600 innodb_lock_wait_timeout = 120 innodb_log_buffer_size = 8M innodb_log_file_size = 200M innodb_log_files_in_group = 3 innodb_max_dirty_pages_pct = 85 innodb_read_io_threads = 8 innodb_write_io_threads = 8 innodb_thread_concurrency = 32 innodb_file_per_table innodb_rollback_on_timeout innodb_undo_directory = /data/mysql/data innodb_log_group_home_dir = /data/mysql/data ###################session########################### join_buffer_size = 8M key_buffer_size = 256M bulk_insert_buffer_size = 8M max_heap_table_size = 96M tmp_table_size = 96M read_buffer_size = 8M sort_buffer_size = 2M max_allowed_packet = 64M read_rnd_buffer_size = 32M ############log set################### log-error = /data/mysql/log/mysqld .err log-bin = /data/mysql/binlog/binlog log_bin_index = /data/mysql/binlog/binlog .index max_binlog_size = 500M slow_query_log_file = /data/mysql/log/slow .log slow_query_log = 1 long_query_time = 10 log_queries_not_using_indexes = ON log_throttle_queries_not_using_indexes = 10 log_slow_admin_statements = ON log_output = FILE,TABLE master_info_file = /data/mysql/binlog/master .info

6、初始化 (稍等一会儿, 可以到/data/mysql/log/mysqld.err日子里查看初始化过程, 看看有没有error信息)

1	`[mysql@mysql-node ~]$ mysqld --defaults-` `file` `=` `/data/mysql/conf/my` `.cnf --initialize-insecure --user=mysql`

7、启动mysqld

1 2 3 4 [mysql@mysql-node ~]$ mysqld_safe --defaults- file = /data/mysql/conf/my .cnf & [mysql@mysql-node ~]$ lsof -i:3306 COMMAND PID USER FD TYPE DEVICE SIZE /OFF NODE NAME mysqld 24743 mysql 23u IPv6 23132988 0t0 TCP *:mysql (LISTEN)

8、登录mysql, 重置密码

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 本地首次使用sock文件登录mysql是不需要密码的 [mysql@mysql-node ~]# mysql -S /data/mysql/tmp/mysqld.sock ............. mysql> ALTER USER 'root' @ 'localhost' IDENTIFIED BY '123456' ; Query OK, 0 rows affected (0.07 sec) mysql> flush privileges ; Query OK, 0 rows affected (0.03 sec) mysql> select host, user ,authentication_string from mysql. user ; + -----------+------------------+------------------------------------------------------------------------+ | host | user | authentication_string | + -----------+------------------+------------------------------------------------------------------------+ | localhost | mysql.infoschema | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | | localhost | mysql.session | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | | localhost | mysql.sys | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | | localhost | root | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 | + -----------+------------------+------------------------------------------------------------------------+ 4 rows in set (0.00 sec)

退出, 此时密码重置后, 就不能使用sock文件无密码登录了

1 2 3 4 5 6 [root@mysql-node ~] # mysql -S /data/mysql/tmp/mysqld.sock ERROR 1045 (28000): Access denied for user 'root' @ 'localhost' (using password: NO) [root@mysql-node ~] # mysql -p123456 mysql: [Warning] Using a password on the command line interface can be insecure. ERROR 2002 (HY000): Can 't connect to local MySQL server through socket ' /tmp/mysql .sock' (2)

做sock文件的软链接

1	`[root@mysql-node ~]` `# ln -s /data/mysql/tmp/mysqld.sock /tmp/mysql.sock`

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 [root@mysql-node ~]# mysql -p123456 或者 [root@mysql-node ~]# mysql -uroot -S /data/mysql/tmp/mysqld.sock -p123456 ............. mysql> select version(); + -----------+ | version() | + -----------+ | 8.0.12 | + -----------+ 1 row in set (0.00 sec) #授予用户权限. 必须先要创建用户, 才能授权!! (创建用户时要带@并指定地址, 则 grant 授权时的地址就是这个@后面指定的!, 否则 grant 授权就会报错!) mysql> create user 'kevin' @ '%' identified by '123456' ; Query OK, 0 rows affected (0.11 sec) mysql> grant all privileges on *.* to 'kevin' @ '%' with grant option ; Query OK, 0 rows affected (0.21 sec) mysql> select host, user ,authentication_string from mysql. user ; + -----------+------------------+------------------------------------------------------------------------+ | host | user | authentication_string | + -----------+------------------+------------------------------------------------------------------------+ | % | kevin | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 | | localhost | mysql.infoschema | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | | localhost | mysql.session | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | | localhost | mysql.sys | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | | localhost | root | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 | + -----------+------------------+------------------------------------------------------------------------+ 5 rows in set (0.00 sec) mysql> update mysql. user set host= '172.16.60.%' where user = "kevin" ; Query OK, 1 row affected (0.16 sec) Rows matched: 1 Changed: 1 Warnings: 0 mysql> flush privileges ; Query OK, 0 rows affected (0.05 sec) mysql> select host, user ,authentication_string from mysql. user ; + -------------+------------------+------------------------------------------------------------------------+ | host | user | authentication_string | + -------------+------------------+------------------------------------------------------------------------+ | 172.16.60.% | kevin | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 | | localhost | mysql.infoschema | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | | localhost | mysql.session | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | | localhost | mysql.sys | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | | localhost | root | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 | + -------------+------------------+------------------------------------------------------------------------+ 5 rows in set (0.00 sec) mysql> create user 'bobo' @ '172.16.60.%' identified by '123456' ; Query OK, 0 rows affected (0.09 sec) mysql> grant all privileges on *.* to 'bobo' @ '172.16.60.%' ; Query OK, 0 rows affected (0.17 sec) mysql> flush privileges ; Query OK, 0 rows affected (0.04 sec) mysql> select host, user ,authentication_string from mysql. user ; + -------------+------------------+------------------------------------------------------------------------+ | host | user | authentication_string | + -------------+------------------+------------------------------------------------------------------------+ | 172.16.60.% | bobo | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 | | 172.16.60.% | kevin | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 | | localhost | mysql.infoschema | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | | localhost | mysql.session | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | | localhost | mysql.sys | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | | localhost | root | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 | + -------------+------------------+------------------------------------------------------------------------+ 6 rows in set (0.00 sec) mysql> show grants for kevin@ '172.16.60.%' ; + -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | Grants for kevin@172.16.60.% | + -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | GRANT SELECT , INSERT , UPDATE , DELETE , CREATE , DROP , RELOAD, SHUTDOWN, PROCESS, FILE, REFERENCES , INDEX , ALTER , SHOW DATABASES, SUPER, CREATE TEMPORARY TABLES, LOCK TABLES, EXECUTE , REPLICATION SLAVE, REPLICATION CLIENT, CREATE VIEW , SHOW VIEW , CREATE ROUTINE, ALTER ROUTINE, CREATE USER , EVENT, TRIGGER , CREATE TABLESPACE, CREATE ROLE, DROP ROLE ON *.* TO `kevin`@`172.16.60.%` WITH GRANT OPTION | + -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ 1 row in set (0.00 sec)

MySQL单机多实例安装配置

通过上面二进制部署可知, 已经起来一个3306端口的MySQL实例, 现在需要再起来两个实例, 分别为3307, 3308. 操作如下:

创建实例的数据目录

1 2 3 4 [root@mysql-node ~] # mkdir -p /data/mysql3307/{data,log,binlog,conf,tmp} [root@mysql-node ~] # mkdir -p /data/mysql3308/{data,log,binlog,conf,tmp} [root@mysql-node ~] # chown -R mysql.mysql /data/mysql3307 [root@mysql-node ~] # chown -R mysql.mysql /data/mysql3308

配置mysql

1 2 3 4 5 6 7 [root@mysql-node ~] # cp -r /data/mysql/conf/my.cnf /data/mysql3307/conf/ [root@mysql-node ~] # cp -r /data/mysql/conf/my.cnf /data/mysql3308/conf/ [root@mysql-node ~] # sed -i 's#/data/mysql/#/data/mysql3307/#g' /data/mysql3307/conf/my.cnf [root@mysql-node ~] # sed -i 's#/data/mysql/#/data/mysql3308/#g' /data/mysql3308/conf/my.cnf [root@mysql-node ~] # sed -i 's/3306/3307/g' /data/mysql3307/conf/my.cnf [root@mysql-node ~] # sed -i 's/3306/3308/g' /data/mysql3308/conf/my.cnf [root@mysql-node ~] # chown -R mysql.mysql /data/mysql*

进行初始化两个实例

1 2	`[root@mysql-node ~]` `# mysqld --defaults-file=/data/mysql3307/conf/my.cnf --initialize-insecure --user=mysql` `[root@mysql-node ~]` `# mysqld --defaults-file=/data/mysql3308/conf/my.cnf --initialize-insecure --user=mysql`

接着启动mysqld

1 2	`[root@mysql-node ~]` `# mysqld_safe --defaults-file=/data/mysql3307/conf/my.cnf &` `[root@mysql-node ~]` `# mysqld_safe --defaults-file=/data/mysql3308/conf/my.cnf &`

查看启动是否成功

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 [root@mysql-node ~] # ps -ef|grep mysql mysql 23996 1 0 14:37 ? 00:00:00 /bin/sh /usr/local/mysql/bin/mysqld_safe --defaults- file = /data/mysql/conf/my .cnf mysql 24743 23996 0 14:38 ? 00:00:17 /usr/local/mysql/bin/mysqld --defaults- file = /data/mysql/conf/my .cnf --basedir= /usr/local/mysql --datadir= /data/mysql/data --plugin- dir = /usr/local/mysql/lib/plugin --log-error= /data/mysql/log/mysqld .err -- open -files-limit=65535 --pid- file = /data/mysql/tmp/mysqld .pid --socket= /data/mysql/tmp/mysqld .sock --port=3306 root 30473 23727 0 15:33 pts /0 00:00:00 /bin/sh /usr/local/mysql/bin/mysqld_safe --defaults- file = /data/mysql3307/conf/my .cnf mysql 31191 30473 17 15:33 pts /0 00:00:02 /usr/local/mysql/bin/mysqld --defaults- file = /data/mysql3307/conf/my .cnf --basedir= /usr/local/mysql --datadir= /data/mysql3307/data --plugin- dir = /usr/local/mysql/lib/plugin --user=mysql --log-error= /data/mysql3307/log/mysqld .err -- open -files-limit=65535 --pid- file = /data/mysql3307/tmp/mysqld .pid --socket= /data/mysql3307/tmp/mysqld .sock --port=3307 root 31254 23727 0 15:33 pts /0 00:00:00 /bin/sh /usr/local/mysql/bin/mysqld_safe --defaults- file = /data/mysql3308/conf/my .cnf mysql 31977 31254 39 15:33 pts /0 00:00:02 /usr/local/mysql/bin/mysqld --defaults- file = /data/mysql3308/conf/my .cnf --basedir= /usr/local/mysql --datadir= /data/mysql3308/data --plugin- dir = /usr/local/mysql/lib/plugin --user=mysql --log-error= /data/mysql3308/log/mysqld .err -- open -files-limit=65535 --pid- file = /data/mysql3308/tmp/mysqld .pid --socket= /data/mysql3308/tmp/mysqld .sock --port=3308 root 32044 23727 0 15:34 pts /0 00:00:00 grep --color=auto mysql [root@mysql-node ~] # lsof -i:3307 COMMAND PID USER FD TYPE DEVICE SIZE /OFF NODE NAME mysqld 31191 mysql 22u IPv6 23144844 0t0 TCP *:opsession-prxy (LISTEN) [root@mysql-node ~] # lsof -i:3308 COMMAND PID USER FD TYPE DEVICE SIZE /OFF NODE NAME mysqld 31977 mysql 22u IPv6 23145727 0t0 TCP *:tns-server (LISTEN) [root@mysql-node ~] # lsof -i:3306 COMMAND PID USER FD TYPE DEVICE SIZE /OFF NODE NAME mysqld 24743 mysql 23u IPv6 23132988 0t0 TCP *:mysql (LISTEN)

登录3307端口实例, 并设置密码

1 2 3 4 5 6 7 [root@mysql-node ~] # mysql -S /data/mysql3307/tmp/mysqld.sock ............ mysql> ALTER USER 'root' @ 'localhost' IDENTIFIED BY '123456' ; Query OK, 0 rows affected (0.11 sec) mysql> flush privileges; Query OK, 0 rows affected (0.11 sec)

退出, 使用新密码登录

1 2 3 [root@mysql-node ~] # mysql -uroot -S /data/mysql3307/tmp/mysqld.sock -p123456 ............. mysql>

同理, 登录3308端口实例, 并设置密码

1 2 3 4 5 6 7 [root@mysql-node ~] # mysql -S /data/mysql3308/tmp/mysqld.sock ........... mysql> ALTER USER 'root' @ 'localhost' IDENTIFIED BY '123456' ; Query OK, 0 rows affected (0.13 sec) mysql> flush privileges; Query OK, 0 rows affected (0.03 sec)

退出, 使用新密码登录

1 2 3 [root@mysql-node ~] # mysql -uroot -S /data/mysql3308/tmp/mysqld.sock -p123456 .................... mysql>

3306, 3307, 3308三个端口实例的启动命令分别为:

1 2 3 mysqld_safe --defaults-file=/data/mysql/conf/my.cnf & mysqld_safe --defaults-file=/data/mysql3307/conf/my.cnf & mysqld_safe --defaults-file=/data/mysql3308/conf/my.cnf &

登录命令分别为:

1 2 3 mysql -uroot -S /data/mysql/tmp/mysqld .sock -p123456 mysql -uroot -S /data/mysql3307/tmp/mysqld .sock -p123456 mysql -uroot -S /data/mysql3308/tmp/mysqld .sock -p123456

不过为了解决大家平时重复安装的问题，特意将多实例安装方法编辑成脚本了，有需要的读者可以在本公众号后台直接回复 MySQL8 获取多实例安装脚本。

Mysql8.0使用过程中踩过的一些坑

1)创建用户和授权在mysql8.0创建用户和授权和之前不太一样了，其实严格上来讲，也不能说是不一样, 只能说是更严格, mysql8.0需要先创建用户(创建用户时要带@并指定地址, 则grant授权时的地址就是这个@后面指定的!, 否则grant授权就会报错!)和设置密码,然后才能授权。

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 mysql> create user 'kevin' @ '%' identified by '123456' ; Query OK, 0 rows affected (0.04 sec) mysql> grant all privileges on *.* to 'kevin' @ '%' with grant option ; Query OK, 0 rows affected (0.04 sec) mysql> create user 'bobo' @ '%' identified by '123456' ; Query OK, 0 rows affected (0.06 sec) mysql> grant all privileges on *.* to 'bobo' @ '%' with grant option ; Query OK, 0 rows affected (0.03 sec) mysql> flush privileges ; Query OK, 0 rows affected (0.04 sec) mysql> select host, user ,authentication_string from mysql. user ; + -----------+------------------+------------------------------------------------------------------------+ | host | user | authentication_string | + -----------+------------------+------------------------------------------------------------------------+ | % | bobo | $A$005$1VY")q?G6<^X@-6LsXrPt5C0TwlTuvHbaOa3sYF0DKViIGoRPuCF8AzwiFcim1 | | % | kevin | $A$005$hy`U}ZB#R::rA8W0y2rmwgySqzv0rmR1eTeNDSaXfQPWIsrh7ytbVdi85 | | localhost | mysql.infoschema | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | | localhost | mysql.session | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | | localhost | mysql.sys | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | | localhost | root | $A$005$/VO_y^7,]6;2qxggBLmJzhA0Qylu5/AHuRScZ/ykKedgZKh/6krOIzPs2 | + -----------+------------------+------------------------------------------------------------------------+

如果还是用Mysql5.7及之前版本的直接授权的方法, 会有报错:

1 2 mysql> grant all privileges on *.* to 'shibo' @ '%' identified by '123456' ; ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'identified by ' 123456 '' at line 1

2)Mysql8.0默认是不能使用root账号进行远程登录的! root账号只能本地登录!

1 2 3 4 5 6 7 8 9 10 11 12 mysql> select host, user ,authentication_string from mysql. user ; + -----------+------------------+------------------------------------------------------------------------+ | host | user | authentication_string | + -----------+------------------+------------------------------------------------------------------------+ | % | bobo | $A$005$1VY")q?G6<^X@-6LsXrPt5C0TwlTuvHbaOa3sYF0DKViIGoRPuCF8AzwiFcim1 | | % | kevin | $A$005$hy`U}ZB#R::rA8W0y2rmwgySqzv0rmR1eTeNDSaXfQPWIsrh7ytbVdi85 | | localhost | mysql.infoschema | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | | localhost | mysql.session | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | | localhost | mysql.sys | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | | localhost | root | $A$005$/VO_y^7,]6;2qxggBLmJzhA0Qylu5/AHuRScZ/ykKedgZKh/6krOIzPs2 | + -----------+------------------+------------------------------------------------------------------------+ 6 rows in set (0.00 sec)

如果想要远程登录, 则需要进行update更新下root账号的权限

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 mysql> update mysql. user set host= '%' where user = "root" ; Query OK, 1 row affected (0.10 sec) Rows matched: 1 Changed: 1 Warnings: 0 mysql> flush privileges ; Query OK, 0 rows affected (0.14 sec) mysql> select host, user ,authentication_string from mysql. user ; + -----------+------------------+------------------------------------------------------------------------+ | host | user | authentication_string | + -----------+------------------+------------------------------------------------------------------------+ | % | bobo | $A$005$1VY")q?G6<^X@-6LsXrPt5C0TwlTuvHbaOa3sYF0DKViIGoRPuCF8AzwiFcim1 | | % | kevin | $A$005$hy`U}ZB#R::rA8W0y2rmwgySqzv0rmR1eTeNDSaXfQPWIsrh7ytbVdi85 | | % | root | $A$005$/VO_y^7,]6;2qxggBLmJzhA0Qylu5/AHuRScZ/ykKedgZKh/6krOIzPs2 | | localhost | mysql.infoschema | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | | localhost | mysql.session | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | | localhost | mysql.sys | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | + -----------+------------------+------------------------------------------------------------------------+ 6 rows in set (0.00 sec)

这样就能在远程使用root账号登录该mysql8.0的数据库了

修改root账号权限, 允许root账号远程登录后, 用navicat进行mysql的远程连接时，出现了弹窗报错：

出现这个原因是mysql8 之前的版本中加密规则是mysql_native_password, 而在mysql8之后,加密规则是caching_sha2_password, 解决问题方法有两种:

1、一种是升级navicat驱动;

2、一种是把mysql用户登录密码加密规则还原成mysql_native_password; 这里选择第二种方法来解决:

1 2 3 4 5 6 7 8 9 10 11 #修改加密规则 mysql> ALTER USER 'root' @ '%' IDENTIFIED BY '123456' PASSWORD EXPIRE NEVER; Query OK, 0 rows affected (0.16 sec) #更新一下用户的密码 mysql> ALTER USER 'root' @ '%' IDENTIFIED WITH mysql_native_password BY '123456' ; Query OK, 0 rows affected (0.08 sec) #刷新权限 mysql> FLUSH PRIVILEGES ; Query OK, 0 rows affected (0.03 sec)

这样问题就解决了。

1、使用sqlyog链接时会出现2058的异常，此时我们需要修改mysql，命令行登录mysql（与修改密码中登录相同，使用修改后的密码），然后执行下面的命令：mysql > ALTER USER ‘root'@‘localhost' IDENTIFIED WITH mysql_native_password BY ‘password'; 其中password为自己修改的密码。然后SQLyog中重新连接，则可连接成功，OK。

2、如果报错：ERROR 1396 (HY000): Operation ALTER USER failed for ‘root'@‘localhost'则使用下面命令：mysql > ALTER USER ‘root'@'%' IDENTIFIED WITH mysql_native_password BY ‘password';
sqlyog链接时出现2058异常

修改默认编码方式 mysql8.0默认编码方式为utf8mb4，因此使用时不需要修改，可使用如下命令查看：

1	`mysql > SHOW VARIABLES` `WHERE` `Variable_name` `LIKE` `'character_set_%'` `OR` `Variable_name` `LIKE` `'collation%'` `;`

如果需要修改其他编码方式，比如需要修改为utf8mb4，可以使用如下方式：

1 2 3 4 5 6 7 8 9 10 修改mysql配置文件my.cnf, 找到后请在以下三部分里添加如下内容： [client] default-character-set = utf8mb4 [mysql] default-character-set = utf8mb4 [mysqld] character-set-client-handshake = FALSE character-set-server = utf8mb4 collation-server = utf8mb4_unicode_ci init_connect='SET NAMES utf8mb4'

然后重启mysqld服务即可, 其中:

1 2 3 4 5 character_set_client (客户端来源数据使用的字符集) character_set_connection (连接层字符集) character_set_database (当前选中数据库的默认字符集) character_set_results (查询结果字符集) character_set_server (默认的内部操作字符集)

数据库连接参数中:

1 2	`characterEncoding=utf8 会被自动识别为utf8mb4，也可以不加这个参数，会自动检测。` `而autoReconnect=true 是必须加上的。`

6)部分参数配置查询命令

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 #查询mysql最大连接数设置 mysql> show global variables like 'max_conn%' ; mysql> SELECT @@MAX_CONNECTIONS AS 'Max Connections' ; # 查看最大链接数 mysql> show global status like 'Max_used_connections' ; # 查看慢查询日志是否开启以及日志位置 mysql> show variables like 'slow_query%' ; # 查看慢查询日志超时记录时间 mysql> show variables like 'long_query_time' ; # 查看链接创建以及现在正在链接数 mysql> show status like 'Threads%' ; # 查看数据库当前链接 mysql> show processlist; # 查看数据库配置 mysql> show variables like '%quer%' ;