Nginx: 502 Bad Gateway

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# プロセス確認
ps aux | grep node
ps aux | grep gunicorn

# ログ確認
tail -f /var/log/nginx/error.log

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upstream backend {
    server 127.0.0.1:3000;
    keepalive 32;
}

server {
    location / {
        proxy_pass http://backend;
        proxy_connect_timeout 60s;
        proxy_send_timeout 60s;
        proxy_read_timeout 60s;
        proxy_buffer_size 128k;
        proxy_buffers 4 256k;
    }
}

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location ~ \.php$ {
    fastcgi_pass unix:/var/run/php/php8.1-fpm.sock;
    fastcgi_read_timeout 300;
}