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piątek, 13 czerwca 2025

Kubernetes init database in a dirty way

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Sometimes you need a dirty trick initialized the kubernetes running database with a set of sql statements (ddls). Here you are a simple exam...
piątek, 24 listopada 2023

Maven - Debugging the PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

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From time to time that infamous exception attacks us. Usually, it is just as simple as import the valid key to your cacerts trustStore or s...
poniedziałek, 30 października 2023

RabbitMQ - python publish to the channel required mTLS authentication

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To make possible publish an event to the RabbitMQ channel secured with TLS certificate one requires delivering the `ssl_options` whilst cre...
czwartek, 19 października 2023

SQL window functions by example

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The following query computes number of metrics written in a given hour select time, workflow, metrics_written, CAST(TO_CHAR(time,...
piątek, 7 kwietnia 2023

How to intercept requests with lua script in Istio service mesh

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Add custom header to the responses comming out the given Kubernetes application apiVersion: networking.istio.io/v1alpha3 kind: EnvoyFi...
środa, 5 kwietnia 2023

Oneliner for generating a self-signed x.509 certificate for scripting purposes

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Purpose There are cases when we'd need a quick way to generate x.509 certificate for scripting adhoc purposes without a need to create ...
poniedziałek, 30 stycznia 2023

Pandas write integer dataframe column as a timestamp into the database

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To display DataFrame's datatypes use dtypes property. > print(df.dtypes) last_login float64 created_at int64 In order to ...