Top 25 AWS services explained EC2 – Your server. But in the cloud. You pay even when it’s doing nothing. (Sound familiar?) Lambda – EC2’s lazy cousin. Only wakes up when there’s work. No work, no bill. ECS – “I want containers but Kubernetes gives me anxiety.” EKS – Kubernetes. For people who enjoy suffering professionally. Auto Scaling – Your app gets famous overnight. This makes sure it doesn’t die from the attention. S3 – A bucket that never fills up. Jeff Bezos’s gift to humanity. EBS – A hard drive for your EC2. Loyal. But only to one instance at a time. EFS – EBS but for people who like sharing. Multiple instances, one file system. FSx – EFS but for enterprises who need Windows compatibility and a bigger invoice. Snowball – When your internet is too slow to upload data, AWS ships you a literal box. VPC – Your private neighborhood inside AWS. Strangers not allowed. Route 53 – The GPS of your app. Tells traffic where to go. ELB – The bouncer at the club. Splits traffic so no one server gets overwhelmed. CloudFront – Your content, cached globally. Because nobody likes a slow website. Direct Connect – A private highway between your office and AWS. No public internet drama. RDS – A managed database. AWS handles backups so you can sleep at night. DynamoDB – NoSQL at insane speed. Schema? We don’t do that here. Aurora – RDS on steroids. Faster, smarter, slightly more expensive. Redshift – A warehouse for your data. Not clothes. Petabytes of analytics data. ElastiCache – RAM for your app. Because hitting the database every time is embarrassing. IAM – The bouncer for your entire AWS account. Get this wrong and you’re headlines. KMS – Locks your secrets in a vault. AWS holds the key. You trust them. Mostly. Cognito – “Login with Google” but you built it on AWS. GuardDuty – The security camera that never blinks. Watches for sketchy behavior 24/7. WAF – Stops hackers at the door before they touch your app. Bookmark it.
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Most people use Linux every day. But Very few understand what actually happens after they press the power button. >>>Here’s the sequences Linux goes through before you get the login screen. Power button pressed → BIOS or UEFI initializes hardware and runs POST. Firmware locates the bootloader from disk. Bootloader loads the Linux kernel and initramfs into RAM. Kernel decompresses and takes control of the CPU. Memory management and the scheduler are initialized. Device drivers load to communicate with hardware. Temporary root filesystem mounts from initramfs. PID 1 starts as systemd and userspace begins. System services and daemons start in order. Login prompt or GUI becomes available. You run a command and it becomes a process with a PID. Process runs in user mode with limited privileges. When hardware access is needed, a system call is made. CPU switches from user mode to kernel mode. Kernel validates the request and executes through drivers. Result is returned back to user space. Scheduler continuously allocates CPU time across processes. Virtual memory isolates and protects processes. Filesystem manages data abstraction over storage. Network stack processes packets inside the kernel. Linux is the kernel coordinating hardware, processes, memory, and security through strict privilege control.
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Top 25 AWS services explained with a punch EC2 – Your server. But in the cloud. You pay even when it’s doing nothing. (Sound familiar?) Lambda – EC2’s lazy cousin. Only wakes up when there’s work. No work, no bill. ECS – “I want containers but Kubernetes gives me anxiety.” EKS – Kubernetes. For people who enjoy suffering professionally. Auto Scaling – Your app gets famous overnight. This makes sure it doesn’t die from the attention. S3 – A bucket that never fills up. Jeff Bezos’s gift to humanity. EBS – A hard drive for your EC2. Loyal. But only to one instance at a time. EFS – EBS but for people who like sharing. Multiple instances, one file system. FSx – EFS but for enterprises who need Windows compatibility and a bigger invoice. Snowball – When your internet is too slow to upload data, AWS ships you a literal box. VPC – Your private neighborhood inside AWS. Strangers not allowed. Route 53 – The GPS of your app. Tells traffic where to go. ELB – The bouncer at the club. Splits traffic so no one server gets overwhelmed. CloudFront – Your content, cached globally. Because nobody likes a slow website. Direct Connect – A private highway between your office and AWS. No public internet drama. RDS – A managed database. AWS handles backups so you can sleep at night. DynamoDB – NoSQL at insane speed. Schema? We don’t do that here. Aurora – RDS on steroids. Faster, smarter, slightly more expensive. Redshift – A warehouse for your data. Not clothes. Petabytes of analytics data. ElastiCache – RAM for your app. Because hitting the database every time is embarrassing. IAM – The bouncer for your entire AWS account. Get this wrong and you’re headlines. KMS – Locks your secrets in a vault. AWS holds the key. You trust them. Mostly. Cognito – “Login with Google” but you built it on AWS. GuardDuty – The security camera that never blinks. Watches for sketchy behavior 24/7. WAF – Stops hackers at the door before they touch your app. Bookmark it.