Arech

IT layman, likes reading, watching moves; appreciates Japan's cultures and anime series and songs.

How to Renew Mailcow SSL Certificate?

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ACME-Mailcow acme-mailcow is a bulit-in add on to issue, renew/update certificates for the domain. Autodiscover and autoconfig sharing the same SSL certificate are created for MS outlook. 1. Restart acme-mailcow client: docker-compose restart acme-mailcow 2. Check expiry date: bash /opt/mailcow-dockerized/helper-scripts/expiry-dates.sh 3. Renew by force: touch /opt/mailcow-dockerized/data/assets/ssl/force_renew; docker-compose restart acme-mailcow 4. Monitor acme activity: docker-compose logs […]

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About Fail2ban Failed Running On Fresh Debian 12

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Background I switched server OS from Uuntu 24.04 to Debian 12 bookworm. After updates, among priorities, I installed fail2ban utility to prevent sshd attack. It turned out a failed process.  At the /etc/fail2ban directory, a copy of fail.conf was made fail.local, a traditional practice. Fail2ban showed an error exit code: root@xxxxxxxxx:/etc/fail2ban# systemctl restart fail2banroot@xxxxxxxxx:/etc/fail2ban# systemctl

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How to apply for a free wildcard SSL certificate with cloudflare API on Ubuntu

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Background 1) plaintext transmission is no longer acceptable. For example, you can not open a website prefixed http.2) Self-signed is not suitable for public demonstration, though 10-year term, and not well recognized by web browsers, too.3) Cyber security should be enhanced is the best practice when you are exposed on the interne. Why wildcard certificates

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