I frequently use ifconfig and cat /proc/net/dev to examine network information. However, today, my cloud server crashed unexpectedly. I reached out to the cloud support for assistance. The engineer utilized iftop to analyze the situation. After the issue was resolved, I started to consider using this tool. Now, let’s take a closer look at this powerful utility.
In python, due to the GIL (Global Interpreter Lock), which is a mutex and ensures only one thread can execute at a time, so the multiple threads parallel execution is not supported under the CPython interpreter. But what about the multiple processes? What is the difference between them? How to choose the right method? Do you know the coroutine? Let’s explore it together.
...The test methods in Go mainly include three types: unit test, benchmark test, and example test.
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Do you really understand the video technology? What is the frame rate, resolution, bit rate and their relationships? Do you know the parameters p and K in the terminology 1080p and 4K? Do you know how to describe the video quality? What is the Blu-ray Disc on earth? What the difference between the codec such as H.264/AVC, H.265/HEVC, AV1? You may notice the Apple ProRes in apple, so do you really understand what it for? Do you know the HDR and Dolby Vision? So why there are so many tailers such as .mp4, .mkv, .flv, etc?
Now this Video Technology 101 will introduce them to you.
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Message queues are a form of asynchronous service-to-service communication. They are important in enhancing a system’s scalability, reliability, and maintainability.
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Do you know the basic method to manage the traffic? There are four methods: Load Balancers, Reverse Proxies, Forward Proxies, and API Gateways. And they have different features and usage scenarios.
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In the daily life, we often hear about different kind of API, such as REST API, GraphQL API, WebSocket, Webhook, RPC and gRPC even the SOAP, so do you know the difference between them? How to choose the right API for your project?
...Do you really know the encode and decode in Python?
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It has been a long time since the linux used init to manage the startup process, such as sudo /etc/init.d/apache2 start or service apache2 start, but the init is serial. To address this issue, the systemd was born. The d is the abbreviation of daemon, which means the systemd is a daemon manager. The systemd substitutes the initd and becomes the default main process PID 1.
Normally, we often write a Dockerfile in the current directory.
Dockerfile is a configuration file that describes how to build the image. You can refer to the official documentation for more details.CMD, only the last one takes effect. So if you have multiple commands to run, you better write them in a script file.systemd in the container. Its startup program is the container application process. The container exists for the main process. Once the main process exits, the container loses its meaning of existence and thus exits. So when you execute multiple commands and if they are blocking, you better write the previous commands in nohup and the last command in the blocking command. (never use the command such as CMD service nginx start, the CMD only will execute as CMD [ "sh", "-c", "service nginx start"], when the sh is executed, the container will exit, the correct way is run it directly CMD ["nginx", "-g", "daemon off;"])