1.安装openssl

1.1查看是否安装了openssl

[root@hh ~]# rpm -ql openssl

1.2未安装，使用安装命令

yum install openssl

1.3安装完或已安装的会出现一下目录，可能会多一些目录

/etc/pki/CA
/etc/pki/CA/certs
/etc/pki/CA/crl
/etc/pki/CA/newcerts
/etc/pki/CA/private
/etc/pki/tls/certs/Makefile
/etc/pki/tls/certs/make-dummy-cert
/etc/pki/tls/certs/renew-dummy-cert
/etc/pki/tls/misc/CA
/etc/pki/tls/misc/c_hash
/etc/pki/tls/misc/c_info
/etc/pki/tls/misc/c_issuer
/etc/pki/tls/misc/c_name

2.创建自签名证书

2.1利用/etc/pki/tls/certs/Makefile中make命令生成证书，需先到该目录下才能使用make命令

cd /etc/pki/tls/certs/Makefile	
ls 
#效果：
[root@hh ~]# cd /etc/pki/tls/certs/
[root@hh certs]# ls
ca-bundle.crt  ca-bundle.trust.crt  make-dummy-cert  Makefile  renew-dummy-cert

2.2创建CA证书
开始会让你填密码，随意设个123456，然后是确定密码，接着让你填’.'继续，最后填上证书信息。
注意：

• 在填写时是只能填一遍，无法使用backspace键，只能输入信息，backspa也会当作信息输入。
• 证书颁发给 / 颁发者姓名是在倒数第二项中填入，你填什么，最后显示什么，如我填入：ACCVRAIZI
  即Common Name (eg, your name or your server's hostname) []:ACCVRAIZI

[root@hh certs]# make ../private/httpd.crt
umask 77 ; \
/usr/bin/openssl genrsa -aes128 2048 > ../private/httpd.key
Generating RSA private key, 2048 bit long modulus
......+++
...........+++
e is 65537 (0x10001)
Enter pass phrase:
Verifying - Enter pass phrase:
umask 77 ; \
/usr/bin/openssl req -utf8 -new -key ../private/httpd.key -x509 -days 365 -out ../private/httpd.crt 
Enter pass phrase for ../private/httpd.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) [XX]:.
State or Province Name (full name) []:CN
Locality Name (eg, city) [Default City]:Gongd^HDong
Organization Name (eg, company) [Default Company Ltd]:GuangZhou
Organizational Unit Name (eg, section) []:WUT
Common Name (eg, your name or your server's hostname) []:test.com
Email Address []:abc@qq.com

2.3最后用xftp连接你的linux虚拟机或云服务器，自签名证书存放在
/etc/pki/tls/private/路径下

[root@hh certs]# ls /etc/pki/tls/private/
httpd.crt  httpd.key

2.4证书：颁发者与颁发给为Common name项填写的名字