MySQL 8.0.16 版本使用YUM在线升级

背景：
才安装部署了MySQL 8.0.15版本不几天，8.0.16版本于2019.04.25发布，考虑在线升级。
并且8.0.15版本的mysql实例作为MySQL5.7.25版本的从库。

1.配置好repo文件：
#wget https://repo.mysql.com//mysql80-community-release-el7-2.noarch.rpm 
#rpm -ivh mysql80-community-release-el7-2.noarch.rpm 

2.模拟安装指定版本：MySQL 8.0.15
# yum search mysql-community --show-duplicates

# yum search mysql-community --show-duplicates | grep -i 8.0.15

#yum -y install mysql-community-libs-compat-8.0.15 mysql-community-server-8.0.15  mysql-community-client-8.0.15  mysql-community-common-8.0.15  mysql-community-devel-8.0.15  mysql-community-libs-8.0.15 mysql-community-libs-compat-8.0.15
登录测试：
查询版本号：
mysql> select version();
+-----------+
| version() |
+-----------+
| 8.0.15    |
+-----------+
1 row in set (0.00 sec)
--创建表：
create database wuhan;
create table wuhan.user(id bigint unsigned not null primary,username varchar(20),city_id int,city_name varchar(20));

--插入数据：
mysql> select * from wuhan.user;
+----+----------+---------+------------+
| id | username | city_id | city_name  |
+----+----------+---------+------------+
|  1 | user001  |     100 | wuhan city |
+----+----------+---------+------------+
1 row in set (0.00 sec)

3.升级到MySQL8.0.16版本：

#yum -y update mysql-community-libs-compat mysql-community-server  mysql-community-client  mysql-community-common  mysql-community-devel  mysql-community-libs mysql-community-libs-compat
-- 版本复核：
# rpm -qa | grep -i mysql-community
mysql-community-common-8.0.16-1.el7.x86_64
mysql-community-devel-8.0.16-1.el7.x86_64
mysql-community-libs-8.0.16-1.el7.x86_64
mysql-community-server-8.0.16-1.el7.x86_64
mysql-community-libs-compat-8.0.16-1.el7.x86_64
mysql-community-client-8.0.16-1.el7.x86_64

4.升级之后的验证：
--MySQL状态验证：
# systemctl status mysqld
● mysqld.service - MySQL Server
   Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
   Active: active (running) since Fri 2019-04-26 09:13:08 CST; 27min ago
     Docs: man:mysqld(8)
           http://dev.mysql.com/doc/refman/en/using-systemd.html
  Process: 30257 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)
 Main PID: 30275 (mysqld)
   Status: "SERVER_OPERATING"
   CGroup: /system.slice/mysqld.service
           └─30275 /usr/sbin/mysqld

-- 登录验证：
# mysql -h10.19.145.159 -uroot -poracle

--版本查询：
mysql> select version();
+-----------+
| version() |
+-----------+
| 8.0.16    |
+-----------+
1 row in set (0.00 sec)
--数据查询：
mysql> select *from wuhan.user;
+----+----------+---------+------------+
| id | username | city_id | city_name  |
+----+----------+---------+------------+
|  1 | user001  |     100 | wuhan city |
+----+----------+---------+------------+
1 row in set (0.00 sec)
-- 主从验证：
mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 10.19.162.134
                  Master_User: repl
                  Master_Port: 3306
                Connect_Retry: 10
              Master_Log_File: mysql_bin.000001
          Read_Master_Log_Pos: 857
               Relay_Log_File: relay.000004
                Relay_Log_Pos: 321
        Relay_Master_Log_File: mysql_bin.000001
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
   ...


总结：使用yum可在线升级,在升级的过程中不停机不重启，配置的主从可正常运行，对业务无感知。
升级过程中主从可正常运行，数据无丢失。
MySQL 8.0.16 版本使用YUM在线升级

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