Ubuntu ee key too small

通过降低SSL security level来解决启动Nginx时报错
SSL routines:SSL_CTX_use_certificate:ee key too small 的问题

1. sudo vim /etc/ssl/openssl.cnf
2. 在头部添加openssl_conf = openssl_init
3. 尾部添加

[openssl_init]
ssl_conf = ssl_sect

[ssl_sect]
system_default = system_default_sect

[system_default_sect]
CipherString = DEFAULT@SECLEVEL=1