🛠 iptables-tracer - штуковина, с помощью которой можно посмотреть, проходит ли трафик через нужные нам цепочки iptables. Посмотрел и воспользовался сам, коротко описал в заметке:

📗 https://sysadmin.pm/iptables-tracer/

#iptables #trace #будничное

​​A short article by Julia Evans about why OSI model doesn't map to TCP/IP really well. And why sometimes it's just easier to say things like "TCP load balancer" or "Ethernet switch" rather than "later 4", "layer 2", etc.

tl;dr: primarily, because OSI is old.

Also, there is a diagram of your usual network packet as a bonus.

Сейчас набирает популярность https://redpanda.com, которые Kafka-совместимы (не с полным функционалом, примерно как Scylla vs Cassandra), они на С++ и с внутренними модулями обработки процессов на WASM чтобы получить систему, напоминающие старые ESB.

Но я сам на это пока смотрю со стороны. И использую скорее как Dev-среду, которая проще Kafka.

🔐 https://www.haveibeenexpired.com/ - мониторинг срока действия SSL сертификата на домене. Там есть бесплатный тариф, включающий в себя 100 проверок в день.

🖱A almost perfect rsync over ssh backup script - процесс написания (хотя точнее будет сказать модификации) скрипта для создания бекапов. Я думаю что многие подобное писали для себя, но в любом случае, посмотреть на то, как это делают другие будет полезно.

#backup #rsync #напочитать

Use dynamic IP addresses · Cloudflare DNS docs
https://developers.cloudflare.com/dns/manage-dns-records/how-to/managing-dynamic-ip-addresses/

PGTune - calculate configuration for PostgreSQL based on the maximum performance for a given hardware configuration
https://pgtune.leopard.in.ua/

Documentation, User Guide, and Tutorial for using SymmetricDS
https://www.symmetricds.org/docs/overview

​How we eliminated service outages from ‘certificate expired’ by setting up alerts with Grafana and Prometheus

There’s one thing most of the customers have in common: At one point or another, expired certificates have caused a problem. In theory, they shouldn’t; the exact expiration date is known, and so is the process for updating. But still the problems persist!

In this blog post, we present a simple yet effective solution: Monitor the expiration date of certificates with Prometheus and visualize it with Grafana, using features from the new table visualization in Grafana 7. Читать дальше.

Ruby Driver for Apache Cassandra - Token-aware Load Balancing Policy
https://docs.datastax.com/en/developer/ruby-driver/1.0/features/load_balancing/token_aware/

Connect Faster to Scylla with a Shard-Aware Port | by ScyllaDB | Medium
https://scylladb.medium.com/connect-faster-to-scylla-with-a-shard-aware-port-4395f7bec85e

Ссылки для погружения в backstage

- быстрый взгляд на фичи - [https://backstage.io/demos](https://backstage.io/demos)
- кто как использует backstage
- spotify - [https://www.youtube.com/watch?v=1XtJ5FAOjPk&t=612s&ab_channel=SpotifyR%26D](https://www.youtube.com/watch?v=1XtJ5FAOjPk&t=612s&ab_channel=SpotifyR%26D)
- american airlines - [https://backstage.spotify.com/blog/adopter-spotlight/american-airlines-runway/](https://backstage.spotify.com/blog/adopter-spotlight/american-airlines-runway/)
- splunk - [https://backstage.spotify.com/blog/community-session/splunk-pink-phonebook/](https://backstage.spotify.com/blog/community-session/splunk-pink-phonebook/)
- zalando - [https://www.youtube.com/watch?v=6sg5uMCLxTA&ab_channel=SpotifyR%26D](https://www.youtube.com/watch?v=6sg5uMCLxTA&ab_channel=SpotifyR%26D)
- dazn
- [https://medium.com/dazn-tech/developer-experience-dx-at-dazn-e6de9a0208d2](https://medium.com/dazn-tech/developer-experience-dx-at-dazn-e6de9a0208d2)
- [https://medium.com/dazn-tech/integrating-backstage-at-dazn-b8ef5268b347](https://medium.com/dazn-tech/integrating-backstage-at-dazn-b8ef5268b347)
- expedia group - [https://backstage.spotify.com/blog/community-session/firehydrant-expedia-loblaw/](https://backstage.spotify.com/blog/community-session/firehydrant-expedia-loblaw/)
- roodie - [https://roadie.io/](https://roadie.io/)
- примеры описания объектов - [https://github.com/backstage/backstage/tree/master/packages/catalog-model/examples](https://github.com/backstage/backstage/tree/master/packages/catalog-model/examples)
- русскоговорящее сообщество - [https://t.me/backstage_ru](https://t.me/backstage_ru)

вот notion - https://aokulov.notion.site/Backstage-a11287867b9042e2b2faadf6c861877b

еще страничка из notion https://aokulov.notion.site/7f0fa84f46c14bd685c375e4cacb8f9d

diff который учитывается синтаксис. Поддерживает Bash, Python, Go и другие.
http://a.e42.link/jprel

https://bucardo.org/Bucardo/
Bucardo is a replication program for two or more Postgres databases. Specifically, it is an asynchronous, multi-source, multi-target (sometimes known as master-master and master-slave or master-standby) table-based replication system. It is written in Perl, and makes extensive use of triggers, PL/PgSQL, and PL/PerlU.

This can even be used as a cheatsheet once you have to do some data analysis with SQL🔥
https://hakibenita.com/sql-for-data-analysis