執行 rpm -ivh MySQL-server-5.5.62-1.el6.x86_64.rpm 命令後出現 

warning: MySQL-server-5.5.62-1.el6.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY

解決辦法：
這是由於yum安裝了舊版本的GPG keys造成的，安裝命令增加 --force  --nodeps 即可解決

rpm -ivh MySQL-server-5.5.62-1.el6.x86_64.rpm --force --nodeps

出現以下內容為安裝成功

warning: MySQL-server-5.5.62-1.el6.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
Preparing...                ########################################### [100%]
   1:MySQL-server           ########################################### [100%]
warning: user mysql does not exist - using root
warning: group mysql does not exist - using root
181101 20:46:39 [Note] Ignoring --secure-file-priv value as server is running with --bootstrap.
181101 20:46:39 [Note] /usr/sbin/mysqld (mysqld 5.5.62) starting as process 2198 ...
181101 20:46:39 [Note] Ignoring --secure-file-priv value as server is running with --bootstrap.
181101 20:46:39 [Note] /usr/sbin/mysqld (mysqld 5.5.62) starting as process 2205 ...

PLEASE REMEMBER TO SET A PASSWORD FOR THE MySQL root USER !
To do so, start the server, then issue the following commands:

/usr/bin/mysqladmin -u root password 'new-password'
/usr/bin/mysqladmin -u root -h hadoop1 password 'new-password'

Alternatively you can run:
/usr/bin/mysql_secure_installation

which will also give you the option of removing the test
databases and anonymous user created by default.  This is
strongly recommended for production servers.

See the manual for more instructions.

Please report any problems at http://bugs.mysql.com/