Collection of cool things I learnt today.
Today I learned about Oracle Cloud Infrastructure port problem. Out of the box the OCI images come with iptables rules preventing any ingress traffic besides 22. To overcome this one should modify the iptables rules (add new ones). Discussion on superuser. Nice Article about the problem
Today I learned about some Java named project. Project Loom: Adds lightweight threads to Java. Project Valhalla: improves performance as it relates to access to data items. Project Panama: simplifies the process of connecting Java programs to non-Java components. Project Amber: explores and incubate smaller, productivity-oriented Java language features that have been accepted as candidate JEPs. More
Today I learned abour Redpanda which is a streaming service alternative to Kafka. Redpanda has implemented its internal Raft concensus algorithm and has no Zookeeper. Redpanda is writting in C++ which make it JVM free, and more developer-friendly for non Java Devs. Redpanda is compatible with Kafka API. Redpanda laverages WASM to enable one-shot transformations. Devs can write their data transformation in any language (compilable to WASM) and compile it to WASM and run it in Redpanda. Redpanda comes with a Panda Hub which contains Open Source transformations. Redpanda is fast, because it is written in C++, uses thread-per-core architecture to use all the underlying hardware. Redpanda comes with an intelligent auto-tuning out-of-the-box which generate optimal settings for hardware/kernel/Redpanda setup. Redpanda achieves 19x better tail latency than Kafka. Redpanda is easier to use than Kafka. More on performance also very good discussion about C++ vs Java when it comes to tail latency. ...
Today I learned about the podman auto-update command. It updates all the containers managed by systemd (e.g. created by podman-generate-systemd --new) to the newest image version. More
Today I learned about the pull flags in the podman build command. --pull=false: will pull the image only if it does not exist in the local repo. --pull=true: will pull the image if it doesn’t exist or if the remote has a newer version (default). --pull-always: will always pull the image. --pull-never: will never pull the image. More
Today I learned some useful podman flags like: --replace: to replace a container if it already exists. --ignore: to ignore errors and continue the work (very useful for bulk deletions). --tz: to set the TZ for the container. More
Today I learned how to export many variable at once in Unix shells (tested in Zsh and Bash). set -a # enable the option var1="value1" var2="value2" var3="value3" var4="value4" set +a # disable the option More here