move dovecot, opensmtpd, nginx from Archlinux to Ubuntu

 i plan to move Archlinux at vultr to Ubuntu at Tencent.

• firewall at Tencent, 
• no need to convert iptables to ufw since Tencent cloud has firewall
• "在轻量数据库中，支持配置防火墙规则来控制访问权限，进行网络隔离以增强安全性。如果不配置防火墙规则，则表示不限制访问数据库的来源，未经授权的访问也可连接数据库。如果配置防火墙规则，限制了来源、协议以及端口，例如：配置来源为172.1.4.12、协议为TCP、端口为45，访问策略为允许，则表示仅允许来源为172.1.4.12，来自 TCP 协议且端口号为45的应用访问轻量数据库。"
• open Tencent firewall port: 80, 443; 25,465,587; 993
• Tencent cloud not allow to use port 25 for outcoming email but port 465 is OK,
• letsencrypt;
• sudo tar -cpzvf letsencrypt_archive.tar.gz -C /etc letsencrypt
• -C /etc: Change directory to /etc first (so the archive contains letsencrypt/ instead of full /etc/letsencrypt/ path)
• sudo tar -xzvpf letsencrypt_archive.tar.gz -C /etc
• sudo apt install certbot python3-certbot-nginx
• dpkg -L certbot
• sudo vim /usr/lib/systemd/system/certbot.service
• add "ExecStartPost=/bin/systemctl reload nginx.service ; /bin/systemctl restart smtpd ; /bin/systemctl restart dovecot" and sudo systemctl daemon-reload
• nginx
• sudo apt install nginx
• sudo scp  vultr:/etc/nginx/nginx.conf .
• sudo scp  vultr:/etc/nginx/httpasswd .
• sudo scp  vultr:/etc/nginx/mime.types .
• sudo scp  vultr:/etc/nginx/ssl/RSA2048.pem .
• on vultr
• cd /srv/http
• sudo rm -rf .local/
• in pyblog and pymoney: sudo rm -rf __pycache__/ .venv/
• sudo tar -cpzvf http.tar.gz -C /srv http
• sudo scp  vultr:/srv/http.tar.gz .
• sudo tar -xzvpf http.tar.gz -C /sr
• update DNS record with new IP
• opensmtpd
• sudo apt install opensmtpd opensmtpd-extras opensmtpd-filter-dkimsign
• on vultr
• sudo chmod o+r myselector.*
• mkdir /etc/smtpd
• sudo scp  vultr:/etc/smtpd/smtpd.conf /etc/smtpd
• sudo ln -s /etc/smtpd/smtpd.conf /etc/smtpd.conf
• sudo scp  vultr:/etc/smtpd/myselector.* .
• sudo chown opensmtpd:opensmtpd myselector.*
• sudo scp  vultr:/etc/smtpd/aliases /etc/smtpd
• sudo scp  vultr:/etc/smtpd/users /etc/smtpd
• update smtpd.conf from "enp1s0" to "eth0"
• sudo scp vultr:/var/mail/hongy19 . ; cd /var/mail/; sudo chown hong19:hongy19 hongy19
• sudo apt isntall mutt; sudo scp vultr:/home/hongy19/.mutt/* .
• 
  
• dovecot
• sudo apt install dovecot-pop3d dovecot-imapd
• sudo scp  vultr:/etc/dovecot/dovecot.conf .
• sudo scp  vultr:/etc/dovecot/dh.pem .
• cd /etc/dovecot/conf.d
• sudo mv 10-auth.conf 10-auth.conf.orig; sudo scp  vultr:/etc/dovecot/conf.d/10-auth.conf .
• sudo scp  vultr:/etc/dovecot/conf.d/20-mailbox.conf .; sudo mv 20-mailbox.conf 10-mail.conf
• sudo scp  vultr:/etc/dovecot/conf.d/30-ssl.conf .;sudo mv 30-ssl.conf 10-ssl.conf
• sudo scp  vultr:/etc/dovecot/conf.d/40-service.conf .
• ubuntu dovecot still 2.3.2, not use new configuraiton file
• dovecot_config_version = 2.4.2
• auth_allow_cleartext = no
• passdb_driver=pam
• mail_driver = mbox
• mail_path = ~/mail
• mail_inbox_path = /var/mail/%{user}
• service_restart_request_count = 1
• ssl_server_cert_file = /etc/letsencrypt/live/hongy19.net/fullchain.pem
• ssl_server_key_file = /etc/letsencrypt/live/hongy19.net/privkey.pem
• ssl_server_dh_file = /etc/dovecot/dh.pem
• service_restart_request_count = 1
• driver = passwd
• 
  
• fail2ban
• sshguard
• uwsgi
• vnstat.service
• others
• cd /home/hongy19
• scp vultr:/home/hongy19/.rtorrent.rc .
• scp vultr:/home/hongy19/.vimrc .
• scp  vultr:/home/hongy19/.mailrc .
• mkdir bin; scp vultr:/home/hongy19/bin/* .
•