centos8降级centos7安装mysql遇到的问题

Posted 2023-03-19

参考技术A 0.客户端登陆报错

luobiaodeMacBook-Air:~ luobiao$ ssh root@39.101.204.8

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!    @

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

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

CentOS 7 安装MySQL 5.6遇到问题及解决方案

 

centos下安装mysql真的没有想象中那么容易，在这里我总结一下遇到的问题

 

1. ERROR 2002 (HY000): Can’t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock’ (2)

出现这种问题一般是MySQL-server没有安装成功，可以通过yum install MySQL-server-5.6.25-1.el7.x86_64.rpm重新安装

2. Fatal error: Can’t open and lock privilege tables: Table ‘mysql.host’ doesn’t exist

执行mysql_install_db –user=mysql

3. rpm安装mysql后/etc/目录下找不到my.cnf

whereis mysql查看mysql安装目录
　　mysql: /usr/bin/mysql /usr/lib64/mysql /usr/include/mysql /usr/share/mysql /usr/share/man/man1/mysql.1.gz
cp /usr/share/mysql/my-default.cnf /etc/my.cnf

4.ERROR 1045 (28000): Access denied for user ‘root’@’localhost’ (using password: NO)

# /etc/init.d/mysql stop
# mysqld_safe –user=mysql –skip-grant-tables –skip-Networking &
# mysql -u root mysql
mysql> UPDATE user SET Password=PASSWORD(‘newpassword’) where USER=’root’; 
mysql> FLUSH PRIVILEGES; 
mysql> quit
# /etc/init.d/mysql restart

5.rpm -ivh安装时包 出现 file /usr/share/mysql/charsets/swe7.xml from install of MySQL-server-5.6.27-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.41-2.el7_0.x86_64

[[email protected] install-files]# yum remove mysql-libs  

6.mysql在linux表明大小写敏感问题

编辑/etc/my.cnf在[mysqld]下插入lower_case_table_names=1
修改完成后重启mysql服务
通过show variables like ‘%case%‘，查看是否修改成功

7.MySQL不能远程连接Host is not allowed to connect to Host ‘10.72.35.8’ is not allowd to connect to this MySQL server

GRANT ALL PRIVILEGES ON . TO ‘root‘@‘%‘WITH GRANT OPTION; 
FLUSH PRIVILEGES

 

8.出现以下错误

[[email protected] jirasetup]# rpm -ivh MySQL-server-advanced-5.6.20-1.rhel5.x86_64.rpm 
Preparing... ################################# [100%]
Updating / installing...
1:MySQL-server-advanced-5.6.20-1.rh################################# [100%]
FATAL ERROR: please install the following Perl modules before executing /usr/bin/mysql_install_db:
Data::Dumper
[[email protected] jirasetup]# 

此时运行 yum install -y perl perl-devel