折腾mysql的小坑记录

1.安装

CentOS下先卸载自带的mariadb

rpm -qa | grep mariadb

mariadb-libs-5.5.-.el7_2.x86_64
mariadb-5.5.-.el7_2.x86_64
mariadb-server-5.5.-.el7_2.x86_64

rpm -e --nodeps mariadb-libs-5.5.-.el7_2.x86_64

rpm -ivh mysql-community-common-5.7.-.el6.x86_64.rpm
rpm -ivh mysql-community-libs-5.7.-.el6.x86_64.rpm

rpm -ivh mysql-community-client-5.7.-.el6.x86_64.rpm
rpm -ivh mysql-community-server-5.7.-.el6.x86_64.rpm

2.密码修改

# service mysqld stop
# mysqld_safe --user=mysql --skip-grant-tables --skip-networking &
# mysql -u root -pmysql

mysql> UPDATE user SET Password=PASSWORD('welcome1') where USER='root';
mysql> FLUSH PRIVILEGES;
mysql> quit
# /etc/init.d/mysql restart
# mysql -uroot -p

如果出现Unknown column 'password' in 'field list'

修改语句

update mysql.user set authentication_string=password('welcome1') where user='root'

3.建表

mysql> create database mydb;
Query OK,  row affected (0.02 sec)
mysql> use mydb;
Database changed
mysql> create table student(stuID char(),stuName char());
Query OK,  rows affected (0.08 sec)
mysql>insert into student values('abc','jack');
Query OK,  row affected (0.03 sec)

4.远程连接端口，基于命令查看

show global variables like 'port';

修改/etc/my.cnf文件

[root@master ~]# cat /etc/my.cnf
# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html

[mysqld]
#
# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at % of total RAM for dedicated server, else %.
# innodb_buffer_pool_size = 128M
#
# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# log_bin
#
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M
port=
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock

# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=

log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

5.远程连接的权限问题

tomcat端报错

数据库端错误运行授权出错

mysql> grant all privileges on *.* to 'root'@'%' with grant option;
ERROR  (HY000): Your password does not satisfy the current policy requirements

Your password does not satisfy the current policy requirements

解决方法：

mysql> use mysql
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> update user set host = '%' where user = 'root';
Query OK,  row affected (0.01 sec)
Rows matched:   Changed:   Warnings: 

mysql> FLUSH   PRIVILEGES;
Query OK,  rows affected (0.00 sec)

几经周折，调通收场。明天折腾搬上Kubernetes环境