状況

現在ec2へrailsで作成したアプリのデプロイ作業をしています。
参考としているサイトは下記です
参考サイト

その際デプロイの事前準備をすべて終えて、自身のec2インスタンスのパブリックIPにアクセスすると下記画像のように表示されます。

production.logとnginx.error.logの表示内容は下記のようになりました。

[ec2-user@ip---*-** log]$ tail -n 30 production.log

[aab14ae7-033f-4efc-a32f-d84b6411c6a2] activesupport (5.2.4.4) lib/active_support/tagged_logging.rb:71:in `block in tagged'
[aab14ae7-033f-4efc-a32f-d84b6411c6a2] activesupport (5.2.4.4) lib/active_support/tagged_logging.rb:28:in `tagged'
[aab14ae7-033f-4efc-a32f-d84b6411c6a2] activesupport (5.2.4.4) lib/active_support/tagged_logging.rb:71:in `tagged'
[aab14ae7-033f-4efc-a32f-d84b6411c6a2] railties (5.2.4.4) lib/rails/rack/logger.rb:26:in `call'
[aab14ae7-033f-4efc-a32f-d84b6411c6a2] actionpack (5.2.4.4) lib/action_dispatch/middleware/remote_ip.rb:81:in `call'
[aab14ae7-033f-4efc-a32f-d84b6411c6a2] actionpack (5.2.4.4) lib/action_dispatch/middleware/request_id.rb:27:in `call'
[aab14ae7-033f-4efc-a32f-d84b6411c6a2] rack (2.2.3) lib/rack/method_override.rb:24:in `call'
[aab14ae7-033f-4efc-a32f-d84b6411c6a2] rack (2.2.3) lib/rack/runtime.rb:22:in `call'
[aab14ae7-033f-4efc-a32f-d84b6411c6a2] activesupport (5.2.4.4) lib/active_support/cache/strategy/local_cache_middleware.rb:29:in `call'
[aab14ae7-033f-4efc-a32f-d84b6411c6a2] actionpack (5.2.4.4) lib/action_dispatch/middleware/executor.rb:14:in `call'
[aab14ae7-033f-4efc-a32f-d84b6411c6a2] rack (2.2.3) lib/rack/sendfile.rb:110:in `call'
[aab14ae7-033f-4efc-a32f-d84b6411c6a2] railties (5.2.4.4) lib/rails/engine.rb:524:in `call'
[aab14ae7-033f-4efc-a32f-d84b6411c6a2] unicorn (6.0.0) lib/unicorn/http_server.rb:634:in `process_client'
[aab14ae7-033f-4efc-a32f-d84b6411c6a2] unicorn (6.0.0) lib/unicorn/http_server.rb:732:in `worker_loop'
[aab14ae7-033f-4efc-a32f-d84b6411c6a2] unicorn (6.0.0) lib/unicorn/http_server.rb:547:in `spawn_missing_workers'
[aab14ae7-033f-4efc-a32f-d84b6411c6a2] unicorn (6.0.0) lib/unicorn/http_server.rb:561:in `maintain_worker_count'
[aab14ae7-033f-4efc-a32f-d84b6411c6a2] unicorn (6.0.0) lib/unicorn/http_server.rb:294:in `join'
[aab14ae7-033f-4efc-a32f-d84b6411c6a2] unicorn (6.0.0) bin/unicorn_rails:209:in `<top (required)>'
[aab14ae7-033f-4efc-a32f-d84b6411c6a2] /home/ec2-user/.rbenv/versions/2.6.6/bin/unicorn_rails:23:in `load'
[aab14ae7-033f-4efc-a32f-d84b6411c6a2] /home/ec2-user/.rbenv/versions/2.6.6/bin/unicorn_rails:23:in `<main>'
I, [2021-03-21T22:22:11.183946 #3319]  INFO -- : [eae6759a-7eeb-4acf-9d0a-e320a79f50e5] Started GET "/" for 114.162.4.244 at 2021-03-21 22:22:11 +0000
I, [2021-03-21T22:22:11.186057 #3319]  INFO -- : [eae6759a-7eeb-4acf-9d0a-e320a79f50e5] Processing by HomeController#index as HTML
I, [2021-03-21T22:22:11.198004 #3319]  INFO -- : [eae6759a-7eeb-4acf-9d0a-e320a79f50e5]   Rendering home/index.html.erb within layouts/application
I, [2021-03-21T22:22:11.202034 #3319]  INFO -- : [eae6759a-7eeb-4acf-9d0a-e320a79f50e5]   Rendered home/_not_logged_in.html.erb (2.2ms)
I, [2021-03-21T22:22:11.202109 #3319]  INFO -- : [eae6759a-7eeb-4acf-9d0a-e320a79f50e5]   Rendered home/index.html.erb within layouts/application (4.0ms)
I, [2021-03-21T22:23:50.999954 #3394]  INFO -- : [53fdae22-8cc9-4f67-b906-f8c3105f6c34] Started GET "/" for 114.162.4.244 at 2021-03-21 22:23:50 +0000
I, [2021-03-21T22:23:51.002153 #3394]  INFO -- : [53fdae22-8cc9-4f67-b906-f8c3105f6c34] Processing by HomeController#index as HTML
I, [2021-03-21T22:23:51.012491 #3394]  INFO -- : [53fdae22-8cc9-4f67-b906-f8c3105f6c34]   Rendering home/index.html.erb within layouts/application
I, [2021-03-21T22:23:51.015594 #3394]  INFO -- : [53fdae22-8cc9-4f67-b906-f8c3105f6c34]   Rendered home/_not_logged_in.html.erb (1.5ms)
I, [2021-03-21T22:23:51.015731 #3394]  INFO -- : [53fdae22-8cc9-4f67-b906-f8c3105f6c34]   Rendered home/index.html.erb within layouts/application (3.1ms)

[ec2-user@ip---*-** log]$ tail -n 30 nginx.error.log

2021/03/21 22:08:22 [error] 3285#0: *2 upstream prematurely closed connection while reading response header from upstream, client: 114.162.4.244, server: (質問主のIP), request: "GET / HTTP/1.1", upstream: "http://unix:/var/www/rails/(アプリ名)/tmp/sockets/.unicorn.sock:/", host: "(質問主のIP)"
2021/03/21 22:22:18 [error] 3285#0: *7 upstream prematurely closed connection while reading response header from upstream, client: 114.162.4.244, server: (質問主のIP), request: "GET / HTTP/1.1", upstream: "http://unix:/var/www/rails/(アプリ名)/tmp/sockets/.unicorn.sock:/", host: "(質問主のIP)"
2021/03/21 22:23:58 [error] 3285#0: *10 upstream prematurely closed connection while reading response header from upstream, client: 114.162.4.244, server: (質問主のIP), request: "GET / HTTP/1.1", upstream: "http://unix:/var/www/rails/(アプリ名)/tmp/sockets/.unicorn.sock:/", host: "(質問主のIP)"

nginx.error.logについては別問題が発生していた時のログが残っていたので関係がありそうな直近三行を抜粋して載せています。
自身のIPに数回アクセスしてるのでログに重複してる部分があります。

また、ローカル環境ではエラーなく動作することが確認できました。

production.logでエラーのようなものは記載されていないことから、nginx.error.logに記載されているエラーを解決すべきだと思うのですが
解決方法がわかりません。
ご教授頂けますと幸いです。

下記追記部分

unicorn.logの内容は以下のようになっております。

[ec2-user@ip-10-0-0-81 log]$ tail -n 30 unicorn.log

I, [2021-03-22T01:36:31.355738 #4728]  INFO -- : worker=1 ready
E, [2021-03-22T01:36:43.528233 #4725] ERROR -- : reaped #<Process::Status: pid 4728 SIGKILL (signal 9)> worker=1
I, [2021-03-22T01:36:43.594661 #4777]  INFO -- : worker=1 ready
E, [2021-03-22T01:47:48.197174 #4725] ERROR -- : reaped #<Process::Status: pid 4777 SIGKILL (signal 9)> worker=1
I, [2021-03-22T01:47:48.225454 #4803]  INFO -- : worker=1 ready
E, [2021-03-22T01:47:54.994849 #4725] ERROR -- : reaped #<Process::Status: pid 4727 SIGKILL (signal 9)> worker=0
I, [2021-03-22T01:47:55.045782 #4805]  INFO -- : worker=0 ready
E, [2021-03-22T01:52:21.252333 #4725] ERROR -- : reaped #<Process::Status: pid 4805 SIGKILL (signal 9)> worker=0
I, [2021-03-22T01:52:21.322827 #4863]  INFO -- : worker=0 ready
E, [2021-03-22T02:04:10.536030 #4725] ERROR -- : reaped #<Process::Status: pid 4803 SIGKILL (signal 9)> worker=1
I, [2021-03-22T02:04:10.608788 #4950]  INFO -- : worker=1 ready
I, [2021-03-22T02:06:44.892695 #4725]  INFO -- : reaped #<Process::Status: pid 4863 exit 0> worker=0
I, [2021-03-22T02:06:44.893436 #4725]  INFO -- : reaped #<Process::Status: pid 4950 exit 0> worker=1
I, [2021-03-22T02:06:44.893516 #4725]  INFO -- : master complete
I, [2021-03-22T02:07:07.224906 #5059]  INFO -- : Refreshing Gem list
I, [2021-03-22T02:07:11.107302 #5059]  INFO -- : unlinking existing socket=/var/www/rails/(アプリ名)/tmp/sockets/.unicorn.sock
I, [2021-03-22T02:07:11.107987 #5059]  INFO -- : listening on addr=/var/www/rails/(アプリ名)/tmp/sockets/.unicorn.sock fd=9
I, [2021-03-22T02:07:11.290183 #5059]  INFO -- : master process ready
I, [2021-03-22T02:07:11.293872 #5061]  INFO -- : worker=0 ready
I, [2021-03-22T02:07:11.295568 #5062]  INFO -- : worker=1 ready
E, [2021-03-22T02:07:32.888086 #5059] ERROR -- : reaped #<Process::Status: pid 5061 SIGKILL (signal 9)> worker=0
I, [2021-03-22T02:07:33.041187 #5065]  INFO -- : worker=0 ready
E, [2021-03-22T02:07:39.725917 #5059] ERROR -- : reaped #<Process::Status: pid 5062 SIGKILL (signal 9)> worker=1
I, [2021-03-22T02:07:39.761959 #5067]  INFO -- : worker=1 ready
E, [2021-03-22T02:18:41.130358 #5059] ERROR -- : reaped #<Process::Status: pid 5065 SIGKILL (signal 9)> worker=0
I, [2021-03-22T02:18:41.228471 #5095]  INFO -- : worker=0 ready
E, [2021-03-22T02:19:22.778405 #5059] ERROR -- : reaped #<Process::Status: pid 5095 SIGKILL (signal 9)> worker=0
I, [2021-03-22T02:19:22.818928 #5099]  INFO -- : worker=0 ready
E, [2021-03-22T02:19:29.499385 #5059] ERROR -- : reaped #<Process::Status: pid 5067 SIGKILL (signal 9)> worker=1
I, [2021-03-22T02:19:29.534852 #5101]  INFO -- : worker=1 ready

また、unicorn.conf.rbの内容は以下のようになっています。(timeoutの秒数部分だけ参考サイトから変更しました)

  # set lets
  $worker  = 2
  $timeout = 300
  $app_dir = "/var/www/rails/(アプリ名)"
  $listen  = File.expand_path 'tmp/sockets/.unicorn.sock', $app_dir
  $pid     = File.expand_path 'tmp/pids/unicorn.pid', $app_dir
  $std_log = File.expand_path 'log/unicorn.log', $app_dir
  # set config
  worker_processes  $worker
  working_directory $app_dir
  stderr_path $std_log
  stdout_path $std_log
  timeout $timeout
  listen  $listen
  pid $pid
  # loading booster
  preload_app true
  # before starting processes
  before_fork do |server, worker|
    defined?(ActiveRecord::Base) and ActiveRecord::Base.connection.disconnect!
    old_pid = "#{server.config[:pid]}.oldbin"
    if old_pid != server.pid
      begin
        Process.kill "QUIT", File.read(old_pid).to_i
      rescue Errno::ENOENT, Errno::ESRCH
      end
    end
  end
  # after finishing processes
  after_fork do |server, worker|
    defined?(ActiveRecord::Base) and ActiveRecord::Base.establish_connection
  end

#試したこと
ec2インスタンスの再起動、Unicornの再起動、Nginxの再起動、
Mysqlの再起動は試しました。

#環境
ruby 2.6.6
Rails 5.2.4.4
Unicorn 6.0.0
Nginx 1.16.1
Mysql 8.0.23