0.客户端登陆报错
luobiaodeMacBook-Air:~ luobiao$ ssh root@39.101.204.8
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@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
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IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the ECDSA key sent by the remote host is
SHA256:jN2L7Ebd8ZV03ErBmMpGwHybqNBnLqOX0TTk9TbgzZs.
Please contact your system administrator.
Add correct host key in /Users/luobiao/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /Users/luobiao/.ssh/known_hosts:8
ECDSA host key for 39.101.204.8 has changed and you have requested strict checking.
Host key verification failed.
解决：
这里面，有一句很关键。
ECDSA host key for 39.101.204.8 has changed and you have requested strict checking.
Host key verification failed.
一般这个问题，是你重置过你的服务器后。你再次想访问会出现这个问题。
ssh-keygen -R 39.101.204.8
1.安装mysql报错
mysqld: error while loading shared libraries: libaio.so.1: cannot open shared object file: No such file or directory
解决：
经过百度说是缺少 libaio.so.1 这个包.这个包是干什么的呢？
我也没查看到？试试先安装这个包。
yum -y install libaio
安装后，解决该问题。
2.[root@later01/errlog]# /etc/init.d/mysqld start
Starting MySQL.2020-04-11T16:49:17.645735Z mysqld_safe error: log-error set to '/errlog/3306/mysql.log', however file don't exists. Create writable for user 'mysql'.
解决： 创建日志文件并赋权
[root@later01/errlog/3306]# echo "" > mysql.log
[root@later01/errlog/3306]# chown -R mysql.mysql /errlog/
3.2020-04-11T16:52:12.084460Z 0 [ERROR] InnoDB: The innodb_system data file './ibdata1' is of a different size 768 pages (rounded down to MB) than the 4864 pages specified in the .cnf file!
解决：注释my.cnf 中的
#innodb_data_file_path=ibdata1:76M;ibdata2:100M;ibdata3:100M:autoextend
