Centos 7.5　　nginx+web集群配置https报错

报错信息:

[root@lb01 conf.d]# nginx -t
nginx: [emerg] BIO_new_file("/etc/nginx/ssl_key/server.crt") failed (SSL: error:02001002:system library:fopen:No such file or directory:fopen('/etc/nginx/ssl_key/server.crt','r') error:2006D080:BIO routines:BIO_new_file:no such file)
nginx: configuration file /etc/nginx/nginx.conf test failed

错误原因:没有证书

解决方法:/etc/nginx/ssl_key里面放置证书