Elastic Beanstalkでnginx_statusを設定

What

SolutionStack: 64bit Amazon Linux 2016.03 v2.1.3 running Ruby 2.3 (Puma)の場合

Where

nginx用の設定はファイルは/etc/nginx/conf.d/webapp_healthd.confだけど、こいつはsymlinkなので、実体は/opt/elasticbeanstalk/support/conf/webapp_healthd.conf

How

.ebextensionsを使う

.ebextensions/nginx.config

commands:
  01_nginx_status:
    command: |
      sed -i -e ':loop; N; $!b loop; ;s/r healthd;\n\n  location \/ {/r healthd;\n\n  location  \/nginx_status {\n    stub_status on;\n    access_log off;\n    allow 127.0.0.1;\n    deny all;\n  }\n\n  location \/ {/g' /opt/elasticbeanstalk/support/conf/webapp_healthd.conf

これが

/opt/elasticbeanstalk/support/conf/webapp_healthd.conf

  access_log  /var/log/nginx/access.log  main;
  access_log /var/log/nginx/healthd/application.log.$year-$month-$day-$hour healthd;

  location / {
    proxy_pass http://my_app; # match the name of upstream directive which is defined above
    proxy_set_header Host $host;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  }

こうなる

/opt/elasticbeanstalk/support/conf/webapp_healthd.conf

  access_log  /var/log/nginx/access.log  main;
  access_log /var/log/nginx/healthd/application.log.$year-$month-$day-$hour healthd;

  location  /nginx_status 
    stub_status on;
    access_log off;
    allow 127.0.0.1;
    deny all;
  }

  location / {
    proxy_pass http://my_app; # match the name of upstream directive which is defined above
    proxy_set_header Host $host;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  }

ある程度冪等性を考慮してるので、毎回実行されても問題ない。