Etcd, one of the crucial components of Kubernetes. If APIServer is the heart, then etcd is the blood vessel that sends the end state of Kubernetes resources to various “organs”, providing high-speed, stable storage, and supporting APIServer’s high load performance. What if the etcd is not working properly? Just the condition as someone has a vascular disease. The deeper you know about them, the better diagnose you can make when issues occur.from unsplash, @John BarkipleRemember the local cache we finished in 20 minutes? If that is a short st...

Credit: SergeyNivens via CanvaThe world of cyber security never fails to surprise us with bolder and more sophisticated cyber-attacks and methods added to its already extensive roster, especially with its relatively short history.Weekends an...

eLearning has varied benefits for learners, as has been amply documented across numerous articles on the web. It allows learners to gain access to quality education from the comforts of their homes, according to their convenience. It allows them to focus on their other interests and education at the same time. When it comes to educators, there’s a dearth of documentation of the positive impacts of eLearning on their work. eLearning has revolutionized the entire learning process, and it isn’t limited to the outcomes achieved by learners alone. The entire learning landscape has ...

On 3 Dec 2021, The Permanent Mission of China sent a note to UN General Assembly complaining two dangerous approaches to China's Shenzhou space station from SpaceX's Starlink satellites during 2021.These two dangerous approaches were happening in July and October respectively and they almost caused collisions of the Starlink satellites and the Shenzhou space station because the two SpaceX satellites manoeuvred continuously to the orbit of China's space station. These dangerous approaches forced the China's space station to do evasive manoeuvre to avoid collisions.According to the note, below w...

The popular job searching site LinkedIn has come out a special version for China which is just offering job searching capabilities and messaging capabilities in the connections. The social media capability like news feeds and peoples activities are stripped out.Now if you are in China and open LinkedIn app, it will prompt you and ask you to download an app called LinkedIn Jobs.You will not be able to dismiss the dialog and you are forced to download the other app if you wanna continue to use LinkedIn services. It will not work even if you fake your location or use VPN. It is still unknown...

When you are working as a network/cluster admin for you team to config the WireGuard VPN for other members, you may meet some of the problems below and these are the solution you can try to fix them.-----------------------------------------------------------------------------------------------------------Problem [1]: The WireGuard handshake request send from the client can be received from the server but the server's response was blocked at some where so the client can not receive server's response after you config multi layers of routing.Test Network Config (setup WireGuard on EXSI VM) :Solut...

JSON (Javascript Object Notation), a prevailing data exchange format, is widely used in various platforms and languages. Golang, of course, will never miss the support for JSON. And with its own standard library, such as those interfaces like the REST API from the API Service in Kubernetes, it can easily process JSON.Although Go’s library works great, we can still seek those open-source JSON libs in Github to maximize our efficiency. Then the features, performance, applicability of these libs are what we should put into consideration.And here comes my “evaluation report.”JSON...

When joining a new internet company, there might be lots of things need to be done to get ready for taking new challenges. These include both culture and tech preparation. in this post, we would focus on how to prepare the first day technically.The first thing to do is to get your laptop or your work machine up, these involves lots of tool setup and accesses. Normally there are three major task categories.AccessAs an engineer, there are lots of accesses needed to access different resources within the company. Normally, you would have the user accounts created first to access emails, slacks etc...