How to tell postfix to relay outbound mail to another local instance

I have two postfix instances on the same machine (Ubuntu 18.04) managed with postmulti. One instance accepts incoming mail from MUAs and from other mailservers on the internet. Mail is delivered to mailboxes with virtual_mailbox_maps and aliases are defined in virtual_alias_maps and also virtual_mailbox_domains is configured. What I want to do: if a mail is…

Webpack Hot Module Reload not working through Proxy

I’ve been trying to figure out how to get Webpack dev server working with Flask, Docker and nginx. I’m not familiar in these technologies so i’m a bit stuck. I have a Makefile that contains: server-watch: server-install uwsgi –http-socket 0.0.0.0:10001 –module my:app –master –processes 4 –enable-threads –honour-stdin my docker file: client-dev: image: node:12.13.1-slim working_dir: /code…

Fail2ban on Debian Buster – the right way to configure?

Fail2ban can be configured in so many places. $ fail2ban-client -i Fail2Ban v0.10.2 reads log file that contains password failure report and bans the corresponding IP addresses using firewall rules. On Debian Buster I can edit my settings in several config files: /etc/fail2ban/jail.d/defaults-debian.conf /etc/fail2ban/fail2ban.conf /etc/fail2ban/jail.conf /etc/fail2ban/action.d/ Some tutorials recommend: cp /etc/fail2ban/jail.conf /etc/fail2ban/jail.local I am confused!…