安装openvpn，生产客户端密钥文件时报错
[root@cmjs-live01-636 2.0]# ./build-key client1
Generating a 1024 bit RSA private key
...........................++++++
...........++++++
writing new private key to 'client1.key'
-----
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) [EN]:
State or Province Name (full name) [CA]:
Locality Name (eg, city) [NJ]:
Organization Name (eg, company) [Fort-Funston]:
Organizational Unit Name (eg, section) [changeme]:
Common Name (eg, your name or your server's hostname) [client1]:
Name [changeme]:
Email Address [mail@host.domain]:
Please enter the following 'extra' attributes
to be sent with your certificate request
A challenge password []:
An optional company name []:
Using configuration from /etc/openvpn/easy-rsa/easy-rsa/2.0/openssl-1.0.0.cnf
Check that the request matches the signature
Signature ok
The Subject's Distinguished Name is as follows
countryName :PRINTABLE:'EN'
stateOrProvinceName :PRINTABLE:'CA'
localityName :PRINTABLE:'NJ'
organizationName :PRINTABLE:'Fort-Funston'
organizationalUnitName:PRINTABLE:'changeme'
commonName :client
name :PRINTABLE:'changeme'
emailAddress :IA5STRING:'mail@host.domain'
Certificate is to be certified until Aug 1 09:50:21 2024 GMT (3650 days)
Sign the certificate? [y/n]:y
openssl TXT_DB error number 2 failed to update database
原因是commonName 跟前面生成ca文件和server 密钥commonname相同导致，可以换一个commonname就可以了。