Mysql：BCLinux安装Mysql 5.7.34

闲来无事，下载了个BCLinux的镜像，装了一台虚拟机玩一下。BCLinux是基于Centos 6的，所以命令和我们使用得较多的Centos 7有所不同，下面记录一下如何在BCLinux系统中安装MySQL 5.7.43。

• 下载rpm包，安装yum源

[root@localhost ~]# wget https://dev.mysql.com/get/mysql80-community-release-el6-3.noarch.rpm --no-check-certificate
[root@localhost ~]# ls
anaconda-ks.cfg  Documents  install.log         Music                                       Pictures  Templates
Desktop          Downloads  install.log.syslog  mysql80-community-release-el6-3.noarch.rpm  Public    Videos
[root@localhost ~]# rpm -ivh mysql80-community-release-el6-3.noarch.rpm
warning: mysql80-community-release-el6-3.noarch.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
Preparing...                ########################################### [100%]
   1:mysql80-community-relea########################################### [100%]
[root@localhost ~]# ls /etc/yum.repos.d/
BCLinux-Base.repo  BCLinux-Source.repo  BigCloud.repo  mysql-community.repo  mysql-community-source.repo

根据上面的结果可以看出，mysql的源已经成功，但此时运行 yum provides mysql-server 命令会发现，提供的mysql是8.0版本的，并不是我们想要的5.7系列版本，需要执行以下命令，开关yum源提供的版本。

[root@localhost ~]# yum-config-manager --disable mysql80-community
[root@localhost ~]# yum-config-manager --enable mysql57-community

此时再执行命令，就会看到5.7系列版本的MySQL了。

• 安装MySQL

[root@localhost ~]# yum -y install mysql-community-server-5.7.34-1.el6.x86_64

• 启动MySQL

[root@localhost ~]# service mysqld status
mysqld is stopped
[root@localhost ~]# service mysqld start
Initializing MySQL database:                               [FAILED]

直接启动MySQL失败，具体原因没有直接显示，需要我们去日志查看。（如果习惯编译安装的同学，可能一下子不知道去哪个目录找日志文件，data目录等，建议可以去/etc/init.d/mysqld这个文件里面找，里面都写得清清楚楚。）

[root@localhost log]# vim /var/log/mysqld.log
2021-06-05T08:04:07.178159Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2021-06-05T08:04:07.354085Z 0 [Warning] InnoDB: New log files created, LSN=45790
2021-06-05T08:04:07.406184Z 0 [Warning] InnoDB: Creating foreign key constraint system tables.
2021-06-05T08:04:07.471971Z 0 [Warning] No existing UUID has been found, so we assume that this is the first time that this server has been started. Generating a new UUID: 9a23f96c-c5d4-11eb-8801-000c29a872b6.
2021-06-05T08:04:07.473719Z 0 [Warning] Gtid table is not ready to be used. Table 'mysql.gtid_executed' cannot be opened.
2021-06-05T08:04:07.476115Z 0 [ERROR] Could not generate RSA private key required for X509 certificate.
2021-06-05T08:04:07.476148Z 0 [ERROR] Aborting

可以看到，启动失败是由于 **Could not generate RSA private key required for X509 certificate.**导致的。原来在mysql 5.7.6以后增强了安全加密连接 ，但在安装时没有进行初始化。mysql在<mysql_home>/bin下提供了一个mysql_ssl_rsa_setup脚本，需要在安装mysql，初始化后执行该脚本才可以。

# 由于刚刚已经初始化失败一次了，所以需要删除数据目录下的文件，才能重新操作。
[root@localhost log]# rm -rf /var/lib/mysql/*  
[root@localhost log]# mysqld --initialize --user=mysql
[root@localhost log]# mysql_ssl_rsa_setup
# 执行完命令后，可以在数据目录下看到各种key

• 再次启动MySQL（使用初始密码登录，并重设密码）

[root@localhost log]# service mysqld start
Starting mysqld:                                           [  OK  ]
# 启动成功，在日志文件获取初始密码

[root@localhost log]# mysql -uroot -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 7
Server version: 5.7.34

Copyright (c) 2000, 2021, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> alter user 'root'@'localhost' identified by '123456';
Query OK, 0 rows affected (0.00 sec)
（修改密码过于简单的话，可能会不符合密码要求，可以通过设置全局变量，使MySQL接受简单的密码，这里就不展开了。）

以上就是BCLinux安装MySQL5.7.34的具体过程，有点小坑，但问题不大，EOF.