1.首先在linux系统下载mysql5.7的安装包
$ cd /home/ $ wget https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-5.7.19-linux-glibc2.12-x86_64.tar.gz
2.建立一个用户组
$ sudo groupadd mysql
3.新建一个mysql用户加入该组
$ sudo useradd -r -g mysql mysql
4.在home目录下解压mysql安装包
$tar -zxvf mysql-5.7.19-linux-glibc2.12-x86_64.tar.gz
5.将解压之后的文件改名为mysql 放到 /opt下边
$ mv mysql-5.7.19-linux-glibc2.12-x86_64 /opt/mysql
6.进入到/opt/mysql目录下更改权限
$ chown -R mysql:mysql ./
7.安装辅助的库文件，当然不是必须的看你系统中是不是有
$ sudo apt-get intall libaio1
7.在/etc目录下创建文件my.cnf，并且填写设置内容
$ cd /etc $ touch my.cnf $ vi my.cnf
[mysqld] sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES explicit_defaults_for_timestamp=true basedir = /opt/mysql datadir = /data/mysql port = 3306 socket = /opt/mysql/mysqld/mysql.sock pid-file = /opt/mysql/mysqld/mysql.pid character-set-server=utf8 back_log = 300 max_connections = 3000 max_connect_errors = 50 table_open_cache = 4096 max_allowed_packet = 32M max_heap_table_size = 128M read_rnd_buffer_size = 16M sort_buffer_size = 16M join_buffer_size = 16M thread_cache_size = 16 query_cache_size = 128M query_cache_limit = 4M ft_min_word_len = 8 thread_stack = 512K transaction_isolation = REPEATABLE-READ tmp_table_size = 128M long_query_time = 6 server_id=1 innodb_buffer_pool_size = 1G innodb_thread_concurrency = 16 innodb_log_buffer_size = 16M innodb_log_file_size = 512M innodb_log_files_in_group = 3 innodb_max_dirty_pages_pct = 90 innodb_lock_wait_timeout = 120 innodb_file_per_table = on [mysqldump] quick max_allowed_packet = 32M [mysql] no-auto-rehash default-character-set=utf8 safe-updates [myisamchk] key_buffer = 16M sort_buffer_size = 16M read_buffer = 8M write_buffer = 8M [mysqlhotcopy] interactive-timeout [mysqld_safe] open-files-limit = 8192 [client] port = 3306 socket = /opt/mysql/mysqld/mysql.sock default-character-set = utf8
9、创建文件夹/data/mysql，/opt/mysql/mysqld
$ mkdir -p /data/mysql $ chown -R mysql:mysql /data/mysql $ chmod -R 755 /data/mysql $ mkdir -p /opt/mysql/mysqld $ chown -R mysql:mysql /opt/mysql/mysqld $ chmod -R 755 /opt/mysql/mysqld
10、到解压的mysql目录中找到bin ，在bin中有 mysqld 可执行文件。执行
$ ./mysqld --user=mysql --basedir=/opt/mysql --datadir=/data/mysql --initialize
generated for root@localhost: dsuIequSe5>E 由上面信息可得：dsuIequSe5>E （为root用户的临时登录密码）
11.配置系统环境变量
$vim /etc/profile
MYSQL_HOME=/opt/mysql/bin PATH=$MYSQL_HOME/bin:$PATH export MYSQL_HOME
12.连接数据库
$mysql -u root -p
密码：步骤10中生成的零时密码
mysql> set password=password('你的新密码');
13.window下的navicat连接linux的mysql
```
可能会出现ERROR 1130 (HY000): Host ‘xxx.xxx.xxx.xxx’ is not allowed to connect to this MySQL server
解决办法：
改mysql的user表，具体方法如下：
1、先用use mysql;进入名字为mysql的数据库；
2、mysql>update user set host='%' where host='localhost' and user='root';
3、mysql>flush privileges;
4、使用查询语句查看是否修改过来：mysql>select host,user from user;
5、出现%就可以连上了
```