openssl TXT_DB error number 2 failed to update database

产生的原因是:

 

This thing happens when certificates share common data. You cannot have two 
certificates that look otherwise the same.

 

方法一:

 

修改demoCA下 index.txt.attr

 

将

unique_subject = yes

 改为

unique_subject = no

 方法二:

 

删除demoCA下的index.txt,并再touch下

 

rm index.txt

touch index.txt

 方法三:

将 common name设置成不同的