Create SSL Certificate (Self Signed)2025/04/21 |
| 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/ssl/private root@dlp:/etc/ssl/private# openssl ecparam -name prime256v1 -genkey -out server.key root@dlp:/etc/ssl/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) [AU]:JP # country code State or Province Name (full name) [Some-State]:Hiroshima # state Locality Name (eg, city) []:Hiroshima # city Organization Name (eg, company) [Internet Widgits Pty Ltd]:GTS # company Organizational Unit Name (eg, section) []:Server World # department Common Name (e.g. server FQDN or YOUR name) []: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:/etc/ssl/private# echo 'subjectAltName = DNS:dlp.srv.world, IP:10.0.0.30' > /tmp/altname.txt # create certificate with 10 years expiration date root@dlp:/etc/ssl/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.worldroot@dlp:/etc/ssl/private# total 20 drwx------ 2 root root 4096 Apr 21 01:08 ./ drwxr-xr-x 4 root root 4096 Apr 15 17:21 ../ -rw-r--r-- 1 root root 895 Apr 21 01:08 server.crt -rw-r--r-- 1 root root 525 Apr 21 01:06 server.csr -rw------- 1 root root 302 Apr 21 01:05 server.key |