CentOS 6.8安装Mysql8.0.13

ERROR 2002 (HY000): Can’t connect to local MySQL server through socket ‘***’ (2)
连接Mysql提示Can’t connect to local MySQL server through socket各种情况以及解决办法
Centos 6.5安装Mysql8
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

CentOs7下卸载和安装Mysql5.6(良心卸载+安装)
https://blog.csdn.net/HengTian_real/article/details/89008431

Centos7.5安装mysql5.7.23-二进制包方式安装-完美安装,一步到位
https://blog.csdn.net/IsJiangWei/article/details/82875118

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1、安装

• 通过rpm命令查看安装包版本

#rpm -qa | grep mysql 

• 卸载mysql

#rpm -e --nodeps mysql-libs-5.1.71-1.el6.x86_64

#for循环删除
for line in `rpm -qa | grep -i mysql`;do yum remove $line; done

//删除mysql目录
#查找和mysql相关的目录
find / -name mysql
#同理删除
for line in `find / -name mysql`;do rm -rf $line; done

• 初始化依赖包

#yum install numactl libaio perl-Time-HiRes per-devel -y

• mysql官方下载安装包mysql-8.0.13-1.el6.x86_64.rpm-bundle.tar

   https://dev.mysql.com/downloads/mysql/
   https://dev.mysql.com/downloads/file/?id=480720

• mysql安装包上传到服务器并解压

#tar -xvf  mysql-8.0.13-1.el6.x86_64.rpm-bundle.tar

• 安装顺序如下

rpm -ivh  mysql-community-common-8.0.13-1.el6.x86_64.rpm
rpm -ivh mysql-community-libs-8.0.13-1.el6.x86_64.rpm
rpm -ivh mysql-community-libs-compat-8.0.13-1.el6.x86_64.rpm
rpm -ivh mysql-community-client-8.0.13-1.el6.x86_64.rpm
rpm -ivh mysql-community-server-8.0.13-1.el6.x86_64.rpm

• 启动mysql服务

//centos6
#service mysqld start
#service mysqld restart
#service mysqld status//查看状态
#chkconfig mysqld on//设置开机自启
#mysql -V //查看版本


//centos7开启、关闭
[root@tencent-cloud ~]# systemctl start mysqld.service
[root@tencent-cloud ~]# systemctl stop mysqld.service
[root@tencent-cloud ~]# systemctl status mysqld.service

• 加入开机启动

systemctl enable mysqld

• 启动过程中找不到mysql.sock

错误日志路径，/var/log/mysqld.log
mysql.sock所在路径，/var/lib/mysql/mysql.sock
#tar cvf mysql_data.tar data
#tar cvzf mysql.tar.gz mysql
#netstat -lnp|grep 3306
#chown -R mysql:mysql mysql
#ps -aux|grep mysql
#mysql_secure_installation
//将正确的socket文件位置，软链接到提示错误的socket文件路径位置
#ln -s /var/lib/mysql/mysql.sock /usr/local/webserver/mysql/mysql.sock

• 生成随机密码

#grep 'temporary password' /var/log/mysqld.log

• 初始化,执行命令,重置密码

[root@tencent-cloud ~]# mysql_secure_installation

#会依次出现以下问题。
Set root password? [Y/n]
是否设置root用户的密码 (y后【设置登录密码】)
Remove anonymous users? [Y/n]
是否删除匿名用户 (y)
Disallow root login remotely? [Y/n]
是否禁止root远程登录 (n)
Remove test database and access to it? [Y/n]
是否删除test数据库(y)
Reload privilege tables now? [Y/n]
是否重新加载授权信息 (y)

//创建远程登录的用户
# 先进入mysql
mysql -u root -p
# 授权(root用户)远程连接权限(不建议)
GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY '远程登录密码' WITH GRANT OPTION;
FLUSH PRIVILEGES;
# 使用单独的远程登录用户(推荐)
GRANT ALL PRIVILEGES ON *.* TO '新用户名'@'%' IDENTIFIED BY '远程登录密码' WITH GRANT OPTION;
FLUSH PRIVILEGES;

• 使用随机密码登陆

#mysql -u root -p  
#ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '新密码';  
use mysql;
show tables;
update user set host = '%' where user = 'root';
FLUSH PRIVILEGES;
exit;

• Host ‘xxx.xx.xxx.xx’ is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts

ERROR同一ip在短时间内产生太多（超过mysql数据库max_connection_errors的最大值）
终端的数据库连接而导致的阻塞

2、升级

• 使用yum升级mysql到5.5

//备份数据库
mysqldump --all-databases -p -u root > /home/mysql.data.bak

1.配置新的yum源。

[root@centosphpyum ~]# rpm -Uvh http://rpms.famillecollet.com/enterprise/remi-release-6.rpm

wget http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
wget http://rpms.famillecollet.com/enterprise/remi-release-6.rpm
rpm -ivh epel-release-6-8.noarch.rpm
rpm -ivh remi-release-6.rpm

配置源配置文件：
ls -1 /etc/yum.repos.d/epel* /etc/yum.repos.d/remi.repo

编辑[remi]下的enabled选项从0设为1


3.更新库更新完成后，开始升级mysql。
rpm -Uvh http://rpms.famillecollet.com/enterprise/remi-release-6.rpm


4.查看更新库中可用的版本：
yum --enablerepo=remi,remi-test list mysql mysql-server

5.升级mysql。
yum --enablerepo=remi install mysql mysql-server


6.升级成功。

• 使用yum升级mysql到(>)5.6

1.下载安装官方yum源
wget https://repo.mysql.com//mysql57-community-release-el7-11.noarch.rpm
rpm -ivh mysql57-community-release-el7-11.noarch.rpm

2.编辑配置 /etc/yum.repos.d/mysql-community.repo

vim  /etc/yum.repos.d/mysql-community.repo

可以看到，文件中列出了mysql的各个版本，其中enabled=1表示选择安装或升级到此版本，
可以看到已经默认选择了5.7版本，其他版本全是enabled=0，注意只能有一个版本设置为选中状态，
否则会直接安装、升级最新版本。

3.升级mysql
yum update mysql-server
确认版本选择正确后，使用yum update mysql-server，yum就会升级到选择的对应版本mysql-server，
并且自动会升级相关包，整个过程基本没有任何多余操作，安装完成后，直接就可以使用了