Ljubljana, Slovenia

Bypassing docker network isolation (hack)

I am the author of the netdata docker image. I created the image before netdata became the popular real time performance monitoring software which it is today - over 15 thousand stars on GitHub! Wow! Due to the network isolation however, you would have to run it in --net=host mode to monitor your network devices.

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Purging cached items from NGINX with LUA

Those of you any how familiar with scaling up a service, will by now be familiar with NGINX as a strong workhorse, when it comes to proxy HTTP requests between multiple backend servers. There’s one thing the open source NGINX version doesn’t do however - you can’t issue a PURGE request against a cached resource and delete it from the cache. That is, until we bring in LUA.

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Stateful locks in Go

Locking serves as a construct which is used to enable writes from several threads or goroutines to the same data structures, to avoid concurrency issues. Imagine if every thread would read a value, add something to this value and then write the value back to the shared data structures - we expect in the best case to lose what we added in some routine, and we have to use a lock to avoid this.

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