Create SSL Certificate (Self Signed)2025/04/17 |
| Create Self Signed SSL Certificate by yourself. It had better to use Self Signed Certificate on the environment for the purpose of testing, development, and so on, not recommended to use on production System. |
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[root@dlp ~]# cd /etc/pki/tls/private [root@dlp private]# openssl ecparam -name prime256v1 -genkey -out server.key [root@dlp private]# openssl req -new -key server.key -out server.csr 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]:JP # country code State or Province Name (full name) []:Hiroshima # state Locality Name (eg, city) [Default City]:Hiroshima # city Organization Name (eg, company) [Default Company Ltd]:GTS # company Organizational Unit Name (eg, section) []:Server World # department Common Name (eg, your name or your server's hostname) []:dlp.srv.world # server's FQDN Email Address []:root@srv.world # admin email address Please enter the following 'extra' attributes to be sent with your certificate request A challenge password []: An optional company name []: # replace the DNS name and IP address to yours below [root@dlp private]# echo 'subjectAltName = DNS:dlp.srv.world, IP:10.0.0.30' > /tmp/altname.txt
# create certificate with 10 years expiration date [root@dlp private]# openssl x509 -in server.csr -out server.crt -req -signkey server.key -extfile /tmp/altname.txt -days 3650 Certificate request self-signature ok subject=C=JP, ST=Hiroshima, L=Hiroshima, O=GTS, OU=Server World, CN=dlp.srv.world, emailAddress=root@srv.world[root@dlp private]# total 12 -rw-r--r--. 1 root root 895 Apr 17 11:16 server.crt -rw-r--r--. 1 root root 530 Apr 17 11:16 server.csr -rw-------. 1 root root 302 Apr 17 11:15 server.key |
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