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DevOps Diaries: Today I just explored an interesting tool, just sharing with you guys also. #LocalStack - This is an open-source tool that lets you run AWS cloud services locally on your machine, without needing an actual AWS account or paying for AWS usage. Instead of…
DevOps Daily: 2 Mins Do you know what a “Cache Avalanche” is? Or ever faced a sudden DB spike when your cache expired? It’s just an overview , later you can dig more if you’re interested. Cache Avalanche: It happens when many cache keys expire at the same time, and suddenly…
What are you building or learning this weekends? Building todo: I'm playing around AWS service catalog - This will help my devs team to spin up entire clone of the application infra ( I'll call it as playground environment) so they can build , delete infra and deploy their new…
DevOps Diaries: Today I was checking one of our codebuild scripts. devs said the deployment was showing an error, but interestingly, the production container still got deployed. Out of curiosity, I started looking into the script. All look fine, except one small but important…
DevOps Daily: 2 Mins Do you know where Linux systems store filesystem metadata? Or have you heard of "Super blocks" before? If No, then just read this post, its just 2 mins bro 🙃 its j just an overview, later you can dig more if you interested. Superblock: In every Linux…
DevOps Daily: 2 Mins Just read this and keep it in your mind - it will definitely helpful in future. Kubernetes resources, such as namespaces, pods, or persistent volumes, can become stuck in a "Terminating" state - One of the reason for that is "Finalizers" Finalizers is a…
DevOps Daily: 2 Mins Only 23% of people answered this correctly - it's the "file name" that is not part of the Linux inode inode (index node) is a data structure in Linux that stores all metadata about a file, except its name. It contains details like: 1. File type – Regular…
DevOps Daily: 2 Mins echo in /proc/sys/kernel/ changes the kernel instantly, You can tweak kernel behavior without rebooting: - Most kernel parameters can be tweaked live. No reboot, no downtime. Its cool , is n't it? - Kernel exposes tunables in /proc/sys, each file = a…
AWS Lambda without burning your hand!!!!!!! medium.com/towards-aws/aw… #aws #lamda #devops
DevOps Daily: 2 Mins Do you know about init containers in kubernetes? Think of it as a setup steps for your main applciation pod, preparing the environment, dependencies, or configuration that your main app needs. Init containers runs before your main application container…
Which one of the following details is not part of a "Linux inode"? #linux #filesystem #devops #sre #devopsinterview
DevOps Diaries: In my initial days of #Kubernetes, when I was learning fundaments (still learning..) , I really like the simplicity and use cases of kubernetes "labels" feature. Annotations, on the other hand, always felt a bit unnecessary to me. Why have a separate thing?…
DevOps Diaries: 🤔Do you know everyone can create files in Linux /tmp directory , but only the owner can delete them? Let’s see how that works, ls -ld /tmp drwxrwxrwt 10 root root 4096 Oct 2 12:00 /tmp Normally, in a world-writable dir (rwxrwxrwx), anyone could delete…
DevOps Diaries: Back in my early Linux admin days, sometimes I saw random processes getting killed with no warning. Logs showed Out of memory: Kill process 1234 (mysqld). I was like - "why is Linux randomly killing stuff? 🤔 The truth: it wasn’t random at all. - OOM-Killer…
DevOps Diaries: lets discuss about SYN attack today!! Here’s why this attacks works… Phase1: During TCP Handshake process, When a server gets a SYN, it creates a half-open connection and places it in the SYN queue. -----> It replies with SYN+ACK and waits for the…
90% of DevOps/SRE engineers (including me at first 😅) ended up choosing the wrong answer in my recent poll - I told you it was a tricky one! The question was simple: (output of below command in bash) - name="abc" && echo $name{1..3}.txt Most people expected the output to be: -…
DevOps Diaries: In most interviews, when I trigger discussion about Kubernetes internals, I notice many engineers assume the kube-apiserver directly talks to the kubelet and instructs it what to do. But that’s not really how it works… - When you apply a Pod manifest, the API…
DevOps Diaries: I was reading about the process lifecycle in Linux and found something interesting - thought to share with all of you. When Linux create a process using a fork (), child process gets a copy of the parent’s memory. But here is the trick: Linux does not actually…
DevOps Diaries: Do you know about the Linux feature “Capabilities”? Introduced after Linux kernel 2.2 (1999), it has become a core security component in modern systems (containers, Kubernetes, cloud infra) let me try to explain, The old problem: Back in the day, Linux…
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