Recently, I developed a simple image tools and implemented some features using OpenCV, in NodeJS.

Here is my experience of using OpenCV in NodeJS…

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Last Sunday, I flashed the third-party firmware EvoX on the Xiaomi 12 I mainly use. Here is the whole process, in case I forget how to operate next time…

Excluding the process of unlocking the Bootloader.

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Today we deployed a new service, behind an AWS application load balancer (ALB). There is an Nginx on every target host, to dispatch requests to each worker process inside the host.

Here is how to configure Nginx to get the real client IP behind AWS ALB.

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In the AWS cloudfront origin policy, there is a cookies whitelist.

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We have a machine for development, running more than 100 NodeJS containers, all connected to a same docker network, interconnected by container names.

Recently, we encountered a strange problem: when the containers communicate with one another, they might sometimes report errors like getaddrinfo EAI_AGAIN, which means DNS query failed.

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