How to solve the mysql error RSA private key file not found

Error when installing mysql

[Note] RSA private key file not found: /db/mysql5.6/data//private_key.pem. Some authentication plugins will not work.
[Note] RSA public key file not found: /db/mysql5.6/data//public_key.pem. Some authentication plugins will not work.

The solution is as follows:

1. Check whether openssl is installed

$rpm -qa openssl

openssl-1.0.0-20.el6_2.5.x86_64

2. Use openssl to generate public and private keys

$ openssl genrsa -out mykey.pem 1024

Generating RSA private key, 1024 bit long modulus
..........++++++
.++++++
e is 65537 (0x10001)
$ openssl rsa -in mykey.pem -pubout -out mykey.pub

writing RSA key

3. Modify key permissions

$ chmod 400 mykey.pem
$ chmod 444 mykey.pub
chown mysql:mysql mykey.pem
chown mysql:mysql mykey.pub

4. Add the public and private key paths to my.cnf

sha256_password_private_key_path=mykey.pem
sha256_password_public_key_path=mykey.pub
如果key放在datadir目录下，直接写key名即可。否则要指定key的全路径

5. Restart mysql

SHOW STATUS查看Rsa_public_key状态，如果不为空，则OK.
mysql> SHOW STATUS LIKE 'Rsa_public_key'\G
*************************** 1. row ***************************
Variable_name: Rsa_public_key
       Value: -----BEGIN PUBLIC KEY-----
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDEALeNX9dY4EMlaDHCIYPBvFNN
NJG2f6dtsyV/IG94TFsKtx/Xobiiz9ihBZSWvUhlfz6aVy9TbN68YEn58G5oOS3o
sxKZQvDF9XvjN0thDPwCgfIwTZgatqmrV/qGewCxQpQ03WHPx+GXQmM9iFSfM84F
pZ8QtiI3m+fIUaOd/QIDAQAB
-----END PUBLIC KEY-----

1 row in set (0.00 sec)

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