通常我们在编译MySQL的时候都加入了with-openssl选项，但这并不代表MySQL已经支持了OpenSSL连接，我们可以通过如下命令进行检测：
SHOW VARIABLES LIKE 'have_openssl'；
如果显示DISABLED则表明MySQL尚不支持OpenSSL.
建立SSL证书
；；建几个目录和文件
mkdir /usr/local/myssl
cd /usr/local/myssl
mkdir private newcerts
touch index.txt
echo "01" > serial
；；拷贝一份OpenSSL的缺省配置到当前目录
cp /usr/local/openssl/openssl.cnf .
；；修改当前目录下的openssl.cnf，将。/demoCA替换为/usr/local/myssl，replace的具体用法见man
replace ./demoCA /usr/local/myssl —— /usr/local/myssl/openssl.cnf
；；建立根证书
openssl req -new -x509 -keyout private/cakey.pem -out cacert.pem -config openssl.cnf
# Sample output：
# Using configuration from /usr/local/myssl/openssl.cnf
# Generating a 1024 bit RSA private key
# ……++++++
# ……++++++
# writing new private key to '/usr/local/myssl/private/cakey.pem'
# Enter PEM pass phrase：
# Verifying password - Enter PEM pass phrase：
# ——
# You are about to be asked to enter information that will be
# incorporated into your certificate request.
# What you are about to enter is what is called a Distinguished Name
# or a DN.
# There are quite a few fields but you can leave some blank
# For some fields there will be a default value，
# If you enter '.'， the field will be left blank.
# ——
# Country Name （2 letter code） [AU]：CN
# State or Province Name （full name） [Some-State]：ZJ
# Locality Name （eg， city） []：JX
# Organization Name （eg， company） [Internet Widgits Pty Ltd]：Centeur CA
# Organizational Unit Name （eg， section）[] ：HN
# Common Name （eg， YOUR name）[] ：MySQL admin
# Email Address []：lypdarling@gmail.com
；；建立服务端证书
openssl req -new -keyout server-key.pem -out server-req.pem -days 3600 -config openssl.cnf
# Sample output：
# Using configuration from /usr/local/myssl/openssl.cnf
# Generating a 1024 bit RSA private key
# ……++++++
# ……++++++
# writing new private key to '/usr/local/myssl/server-key.pem'
# Enter PEM pass phrase：
# Verifying password - Enter PEM pass phrase：
# ——
# You are about to be asked to enter information that will be
# incorporated into your certificate request.
# What you are about to enter is what is called a Distinguished Name
# or a DN.
# There are quite a few fields but you can leave some blank
# For some fields there will be a default value，
# If you enter '.'， the field will be left blank.
# ——
# Country Name （2 letter code） [AU]：CN
# State or Province Name （full name） [Some-State]：ZJ
# Locality Name （eg， city） []：JX
# Organization Name （eg， company） [Internet Widgits Pty Ltd]：Centeur CA
# Organizational Unit Name （eg， section） []：HN
# Common Name （eg， YOUR name） []：MySQL server
# Email Address []：lypdarling@gmail.com
#
# Please enter the following 'extra' attributes
# to be sent with your certificate request
# A challenge password []：
# An optional company name []：
