proxy_ssl_certificate_key
Sets the SSL certificate key file for proxying HTTPS connections.
Description
The proxy_ssl_certificate_key directive defines the file path to the private key associated with the SSL certificate used for establishing secure proxy connections to upstream servers. This is particularly important in scenarios where NGINX acts as a reverse proxy, terminating SSL and forwarding requests to backend services. By providing the correct path to the private key, NGINX can authenticate itself to the upstream server with a certificate, ensuring secure communication over SSL/TLS.
The directive can be utilized in various contexts such as http, server, and location. It accepts a single argument: the file path to the private key file. If your configuration uses SSL/TLS-enabled upstreams, including this directive is essential for ensuring that your proxy connections are secured. The private key file should be readable by the NGINX process, and it should be properly secured to prevent unauthorized access.
When this directive is specified, it typically works hand-in-hand with the proxy_ssl_certificate directive, which specifies the corresponding SSL certificate file. Both are vital components for enabling SSL communication in proxy configurations. Proper setup of these directives is crucial for maintaining the confidentiality and integrity of data during transit, especially when dealing with sensitive information or secure APIs.
Config Example
server {
listen 443 ssl;
server_name example.com;
ssl_certificate /etc/nginx/ssl/example.crt;
proxy_ssl_certificate_key /etc/nginx/ssl/example.key;
location / {
proxy_pass https://backend-server;
}
}Ensure the private key file is readable by the NGINX user.
Make sure to use the correct path for the private key corresponding to the SSL certificate.
If the private key is encrypted, additional configurations may be necessary to provide passphrase management.