[NGINX] 3-7. Configuration - Inheritance & Directive types

1. Inheritance

일반적으로 main context -> http context -> server context -> location context 로 내려가는 정직한 inheritance

2. 3가지 메인 Directive types

events {}

######################
# (1) Array Directive
######################
# Can be specified multiple times without overriding a previous setting
# Gets inherited by all child contexts
# Child context can override inheritance by re-declaring directive
access_log /var/log/nginx/access.log;
access_log /var/log/nginx/custom.log.gz custom_format;

http {

  # Include statement - non directive
  include mime.types;

  server {
    listen 80;
    server_name site1.com;

    # Inherits access_log from parent context (1)
  }

  server {
    listen 80;
    server_name site2.com;

    #########################
    # (2) Standard Directive
    #########################
    # Can only be declared once. A second declaration overrides the first
    # Gets inherited by all child contexts
    # Child context can override inheritance by re-declaring directive
    root /sites/site2;

    # Completely overrides inheritance from (1)
    access_log off;

    location /images {

      # Uses root directive inherited from (2)
      try_files $uri /stock.png;
    }

    location /secret {
      #######################
      # (3) Action Directive
      #######################
      # Invokes an action such as a rewrite or redirect
      # Inheritance does not apply as the request is either stopped (redirect/response) or re-evaluated (rewrite)
      return 403 "You do not have permission to view this.";
    }
  }
}