$ sudo vi /etc/apache2/sites-available/000-default.conf

        ServerName ドメイン
...

$ sudo certbot --apache
Saving debug log to /var/log/letsencrypt/letsencrypt.log Plugins selected: Authenticator apache, Installer apache Enter email address (used for urgent renewal and security notices) (Enter 'c' to cancel):メールアドレス

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Please read the Terms of Service at https://letsencrypt.org/documents/LE-SA-v1.2-November-15-2017.pdf. You must agree in order to register with the ACME server at https://acme-v02.api.letsencrypt.org/directory
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(A)gree/(C)ancel: A

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Would you be willing to share your email address with the Electronic Frontier
Foundation, a founding partner of the Let's Encrypt project and the non-profit
organization that develops Certbot? We'd like to send you email about our work
encrypting the web, EFF news, campaigns, and ways to support digital freedom.
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(Y)es/(N)o: N

Which names would you like to activate HTTPS for?
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1: xxxxxxxxx
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Select the appropriate numbers separated by commas and/or spaces, or leave input blank to select all options shown (Enter 'c' to cancel):1

Please choose whether or not to redirect HTTP traffic to HTTPS, removing HTTP access.
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1: No redirect - Make no further changes to the webserver configuration. 
2: Redirect - Make all requests redirect to secure HTTPS access. Choose this for new sites, or if you're confident your site works on HTTPS. You can undo this change by editing your web server's configuration.
 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Select the appropriate number [1-2] then [enter] (press 'c' to cancel): 2

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Congratulations! You have successfully enabled https://logicoya.com You should test your configuration at: https://www.ssllabs.com/ssltest/analyze.html?d=xxxx 
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...

$ sudo systemctl status certbot.timer
● certbot.timer - Run certbot twice daily
     Loaded: loaded (/lib/systemd/system/certbot.timer; enabled; vendor preset: enabled)
     Active: active (waiting) since Sun 2021-07-04 15:06:16 JST; 44min ago
    Trigger: Mon 2021-07-05 09:59:24 JST; 18h left
   Triggers: ● certbot.service

Jul 04 15:06:16 xxxx systemd[1]: Started Run certbot twice daily.

$ sudo certbot renew --dry-run

curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -

echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list

aptitude update
aptitude install yarn

$ yarn -version
1.21.1

$ mkdir yarn_sample
$ cd yarn_sample
$ yarn init
yarn init v1.21.1
question name (www): yarn_sample
question version (1.0.0): 0.0.1
question description: yarn sample
question entry point (index.js): 
question repository url: 
question author: yoo
question license (MIT): 
question private: 
success Saved package.json
Done in 63.65s.

{
  "name": "yarn_sample",
  "version": "0.0.1",
  "description": "yarn sample",
  "main": "index.js",
  "author": "yoo",
  "license": "MIT"
}

$ yarn add [package]
$ yarn add [package]@[version]
$ yarn add [package]@[tag]

$ npm install
gyp ERR! find Python 
gyp ERR! find Python Python is not set from command line or npm configuration
gyp ERR! find Python Python is not set from environment variable PYTHON
gyp ERR! find Python checking if "python" can be used
gyp ERR! find Python - executable path is "/Users/yoo/.pyenv/versions/3.7.1/bin/python"
gyp ERR! find Python - version is "3.7.1"
gyp ERR! find Python - version is 3.7.1 - should be >=2.6.0 <3.0.0
gyp ERR! find Python - THIS VERSION OF PYTHON IS NOT SUPPORTED

$ npm install --python=python2.7

# apt-get install certbot

# git clone https://github.com/certbot/certbot

# certbot certonly -d ドメイン名
Saving debug log to /var/log/letsencrypt/letsencrypt.log

How would you like to authenticate with the ACME CA?
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1: Spin up a temporary webserver (standalone)
2: Place files in webroot directory (webroot)
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Select the appropriate number [1-2] then [enter] (press 'c' to cancel): 

# ./certbot-auto -d ict-kids.net
Saving debug log to /var/log/letsencrypt/letsencrypt.log

How would you like to authenticate and install certificates?
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
1: Apache Web Server plugin (apache)
2: Nginx Web Server plugin (nginx)
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Select the appropriate number [1-2] then [enter] (press 'c' to cancel): 
...

Please choose whether or not to redirect HTTP traffic to HTTPS, removing HTTP access.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
1: No redirect - Make no further changes to the webserver configuration.
2: Redirect - Make all requests redirect to secure HTTPS access. Choose this for
new sites, or if you're confident your site works on HTTPS. You can undo this
change by editing your web server's configuration.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

/etc/letsencrypt/live/ドメイン名/fullchain.pem
/etc/letsencrypt/live/ドメイン名/privkey.pem

Created an SSL vhost at /etc/apache2/sites-available/000-default-le-ssl.conf
Deploying Certificate to VirtualHost /etc/apache2/sites-available/000-default-le-ssl.conf
Enabling available site: /etc/apache2/sites-available/000-default-le-ssl.conf

server {
        listen 443 default_server ssl;
        listen [::]:443 ssl default_server;
        server_name ドメイン名;

        ....
        ssl_certificate /etc/letsencrypt/live/ドメイン名/fullchain.pem;
        ssl_certificate_key /etc/letsencrypt/live/ドメイン名/privkey.pem;
        ....
}

/root/src/certbot/certbot-auto renew --post-hook "service apache2 restart"

client denied by server configuration

        Options FollowSymLinks
        AllowOverride None
        Require all denied



        AllowOverride None
        Require all granted



        Options Indexes FollowSymLinks
        AllowOverride None
        Require all granted



        Require all denied

    ...
    Require all granted
    ....

$ sudo su -

$ sudo gpasswd -a xxx sudo

# curl -sL https://deb.nodesource.com/setup_10.x | sudo -E bash -
# aptitude installl nodejs
# nodejs -v
v10.16.2
# npm -v
6.9.0