railsの本番環境で「bundle exec pumactl start」と実行するとエラーが出る

Question

CentOS7
Rails 6
Nginx
Puma

以上で本番環境を作って、いざ「bundle exec pumactl start」でアプリを起動させようとすると、
以下のようなエラーが出て起動しません。

uninitialized constant #<Class:#<Puma::DSL:0x00005628c8d4bd08>>::Rails
config/puma.rb:40:in `_load_from'
/home/user/app/vendor/bundle/ruby/2.6.0/gems/puma-3.12.1/lib/puma/dsl.rb:43:in `instance_eval'
/home/user/app/vendor/bundle/ruby/2.6.0/gems/puma-3.12.1/lib/puma/dsl.rb:43:in `_load_from'
/home/user/app/vendor/bundle/ruby/2.6.0/gems/puma-3.12.1/lib/puma/configuration.rb:194:in `block in load'
/home/user/app/vendor/bundle/ruby/2.6.0/gems/puma-3.12.1/lib/puma/configuration.rb:194:in `each'
/home/user/app/vendor/bundle/ruby/2.6.0/gems/puma-3.12.1/lib/puma/configuration.rb:194:in `load'
/home/user/app/vendor/bundle/ruby/2.6.0/gems/puma-3.12.1/lib/puma/control_cli.rb:85:in `initialize'
/home/user/app/vendor/bundle/ruby/2.6.0/gems/puma-3.12.1/bin/pumactl:5:in `new'
/home/user/app/vendor/bundle/ruby/2.6.0/gems/puma-3.12.1/bin/pumactl:5:in `<top (required)>'
/home/user/app/vendor/bundle/ruby/2.6.0/bin/pumactl:23:in `load'
/home/user/app/vendor/bundle/ruby/2.6.0/bin/pumactl:23:in `<top (required)>'
/home/user/.rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bundler-2.0.2/lib/bundler/cli/exec.rb:74:in `load'
/home/user/.rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bundler-2.0.2/lib/bundler/cli/exec.rb:74:in `kernel_load'
/home/user/.rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bundler-2.0.2/lib/bundler/cli/exec.rb:28:in `run'
/home/user/.rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bundler-2.0.2/lib/bundler/cli.rb:465:in `exec'
/home/user/.rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bundler-2.0.2/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
/home/user/.rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bundler-2.0.2/lib/bundler/vendor/thor/lib/thor/invocation.rb:126:in `invoke_command'
/home/user/.rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bundler-2.0.2/lib/bundler/vendor/thor/lib/thor.rb:387:in `dispatch'
/home/user/.rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bundler-2.0.2/lib/bundler/cli.rb:27:in `dispatch'
/home/user/.rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bundler-2.0.2/lib/bundler/vendor/thor/lib/thor/base.rb:466:in `start'
/home/user/.rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bundler-2.0.2/lib/bundler/cli.rb:18:in `start'
/home/user/.rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bundler-2.0.2/exe/bundle:30:in `block in <top (required)>'
/home/user/.rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bundler-2.0.2/lib/bundler/friendly_errors.rb:124:in `with_friendly_errors'
/home/user/.rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bundler-2.0.2/exe/bundle:22:in `<top (required)>'
/home/user/.rbenv/versions/2.6.4/bin/bundle:23:in `load'
/home/user/.rbenv/versions/2.6.4/bin/bundle:23:in `<main>'

nginxの設定は以下の通りです。

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

include /usr/share/nginx/modules/*.conf;

events {
    worker_connections 1024;
}

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;
    types_hash_max_size 2048;

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

    upstream app {
        server unix:/home/user/app/tmp/sockets/puma.sock;
    }

    server {
        listen       443;
        server_name  app.com;
        root         /usr/share/nginx/html;
        client_max_body_size 70m;

        ssl on;
        ssl_certificate "/etc/nginx/ssl.crt/server.crt";
        ssl_certificate_key "/etc/nginx/ssl.key/server.key";
        ssl_session_cache shared:SSL:1m;
        ssl_session_timeout  10m;
        ssl_ciphers HIGH:!aNULL:!MD5;
        ssl_prefer_server_ciphers on;

        include /etc/nginx/default.d/*.conf;

        location / {
            proxy_pass https://app;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header Host $http_host;
            proxy_redirect off;
        }
        
        error_page   404 500 502 503 504  /error.html;
        location = /error.html {
            root   /usr/share/nginx/html;
        }

    }

また、config/puma.rbには

bind "unix://#{Rails.root}/tmp/sockets/puma.sock"

if "production" == ENV.fetch("RAILS_ENV") { "production" }
  ssl_bind '0.0.0.0', '9292', {
    key: "/etc/nginx/ssl.key/server.key",
    cert: "/etc/nginx/ssl.crt/server.crt",
    verify_mode: "none"
  }
end

という設定をしています。

対処法を教えてください。

Answer 1

根本的な解決にはならないのですが、Railsという定数がないと言われているので、対症療法として、次のような修正をしてみてはいかがでしょう。

socketファイルの置き場が変わってしまいますが....

# 変更前
bind "unix://#{Rails.root}/tmp/sockets/puma.sock"

# 変更後
bind "unix:///var/run/puma.sock"

それにしても、なぜRailsが呼び出せないんでしょうね

Answer 2

unicorn使うことにしました。