Grafana MySQL and InfluxDB annotations

What are Annotations and why are useful ? Annotations is a way to add a Marker over the Graph (Panel). Depending on where you store the annotations, you would have the possibility to mark the…

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Networking Problem: I can’t connect to your service (tcp) failed: Connection timed out

Imagine that a friend is trying to connect to one of your services and he mention that when he tries to connect, finally displays a  “(tcp) failed: Connection timed out” The first thing, I go…

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Changing the limits on the fly

I never did this before, but now that I know that it works, I will do it more often. To show how it works, I changed the number of processes (nproc) hard limit of the…

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Query your webservices with a simple python script

Hello all!! I usually need yo check webservices. I check the http code and the time it takes to give me back the result of the soap query. It works only with ssl. To execute…

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Some tips for finding performance issues in Linux

Sometimes we have some trouble with processes that demands lot of IO. There´s a great tool for that, iotop. I executed fio, to generate some read stress: mkdir -p /tmp/data ; fio –runtime=300 –time_based –name=random-read…

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