nginxでロードバランサー構築 + WordPressの非SSL化

# For more information on configuration, see:
#   * Official English Documentation: http://nginx.org/en/docs/
#   * Official Russian Documentation: http://nginx.org/ru/docs/

user nginx;
worker_processes auto;
worker_rlimit_nofile 100000;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;

# Load dynamic modules. See /usr/share/doc/nginx/README.dynamic.
include /usr/share/nginx/modules/*.conf;

events {
    worker_connections 2048;
    multi_accept on;
    use epoll;
}

http {
    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;

    sendfile            on;
    tcp_nopush          on;
    tcp_nodelay         on;
    #keepalive_timeout   65;
    keepalive_timeout   10;
    types_hash_max_size 2048;

    include             /etc/nginx/mime.types;
    default_type        application/octet-stream;

    # Load modular configuration files from the /etc/nginx/conf.d directory.
    # See http://nginx.org/en/docs/ngx_core_module.html#include
    # for more information.
    include /etc/nginx/conf.d/*.conf;

upstream backend {
        server 192.168.30.101:80;
        server 192.168.30.104:80 down;
}

proxy_next_upstream error timeout;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $remote_addr;
proxy_set_header X-Forwarded-Proto https;
proxy_set_header X-Forwarded-Port 443;
port_in_redirect off;
add_header Front-End-Https on;

server_tokens off;
client_header_timeout 10;
client_body_timeout 10;
reset_timedout_connection on;
gzip on;
gzip_http_version 1.0;
gzip_disable "msie6";
gzip_proxied any;
gzip_min_length 1024;
gzip_comp_level 6;
gzip_types text/plain text/css application/x-javascript text/xml application/xml application/xml+rss text/javascript application/javascript application/json;
open_file_cache max=100000 inactive=20s;
open_file_cache_valid 30s;
open_file_cache_min_uses 2;
open_file_cache_errors on;

server {
        listen 80;
        listen [::]:80;
        server_name blog.kamata-net.com;
        return 301 https://$host$request_uri;
}
server {
        listen 443 ssl;
        listen [::]:443 ssl;
        server_name blog.kamata-net.com;
        access_log /var/log/nginx/blog.kamata-net.com-access.log;
        ssl on;
        ssl_certificate /etc/nginx/certs/blog.kamata-net.com.crt;
        ssl_certificate_key /etc/nginx/certs/blog.kamata-net.com.nokey;
        ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3;
        ssl_ciphers RC4:HIGH:!aNULL:!MD5:!SEED:!IDEA;
        ssl_prefer_server_ciphers on;
        ssl_session_cache shared:SSL:10m;
        ssl_session_timeout 10m;

        location / {
                proxy_redirect off;
                proxy_headers_hash_max_size 512;
                proxy_headers_hash_bucket_size 128;
                proxy_pass http://backend;
        }
}

#   Server Certificate:
# Point SSLCertificateFile at a PEM encoded certificate.  If
# the certificate is encrypted, then you will be prompted for a
# pass phrase.  Note that a kill -HUP will prompt again.  A new
# certificate can be generated using the genkey(1) command.
#SSLCertificateFile /etc/pki/tls/certs/localhost.crt
SSLCertificateFile /etc/ssl/certs/blog.kamata-net.com.crt

#   Server Private Key:
#   If the key is not combined with the certificate, use this
#   directive to point at the key file.  Keep in mind that if
#   you've both a RSA and a DSA private key you can configure
#   both in parallel (to also allow the use of DSA ciphers, etc.)
#SSLCertificateKeyFile /etc/pki/tls/private/localhost.key
SSLCertificateKeyFile /etc/ssl/certs/blog.kamata-net.com.key

#   Server Certificate Chain:
#   Point SSLCertificateChainFile at a file containing the
#   concatenation of PEM encoded CA certificates which form the
#   certificate chain for the server certificate. Alternatively
#   the referenced file can be the same as SSLCertificateFile
#   when the CA certificates are directly appended to the server
#   certificate for convinience.
#SSLCertificateChainFile /etc/pki/tls/certs/server-chain.crt
SSLCertificateChainFile /etc/ssl/certs/blog.kamata-net.com.ca

/** Absolute path to the WordPress directory. */
if ( ! defined( 'ABSPATH' ) ) {
        define( 'ABSPATH', __DIR__ . '/' );
}

if (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https') $_SERVER['HTTPS'] = 'on';

/** Sets up WordPress vars and included files. */
require_once ABSPATH . 'wp-settings.php';