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I am a Senior Software Engineer at Monotype and write blogs related to software technologies

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Rclone: Sync files from ftp server to AWS S3 bucket

Introduction Rclone  is a very good command line tool to move files and directories to and from cloud storage. In this post, I will explain the steps involved in setting up of rclone on mac machine and using it for syncing the files from a free ftp server to AWS S3 bucket Steps Install rclone command line Create source remote(ftp server) Create destination remote(AWS S3 bucket) Use rclone command to sync file from source remote(ftp server) to destination remote(AWS S3 bucket).  Installation of rclone Use curl command to install rclone on mac machine curl https://rclone.org/install.sh | sudo bash Create source remote Here source is ftp server, so a remote needs to be created with ftp configuration. Use command rclone config Follow the instructions and opt FTP when you get option to select storage. Use 'speedtest.tele2.net' as host, 'anonymous' for user and password can be anything. Create destination remote Destination remote is AWS S3 bucket. Fo
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Diagnostic Interrupt - A way to debug and perform root cause analysis of unresponsive or unreachable AWS EC2 instance

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Before 15 August 2019, it was very difficult to debug and do root cause analysis of an unresponsive or unreachable AWS EC2 instance. Generally, the operating system gets crashed and rebooted when a kernel panic(in case of Linux) or stop error(in case of Windows) is triggered. The operating system can be configured to perform diagnostics tasks on kernel panic or stop error such as generating memory dump files for root cause analysis and debugging. On 15 August 2019, Amazon introduced a simple API to trigger a kernel panic  by sending   diagnostic Interrupt  to an unresponsive instance, which in turn can direct the operating system to perform tasks like creating a crash dump, loading the secondary kernel, or obtaining a call trace. Some concepts about operating system interrupt An interrupt in the operating system is the highest priority signal send from hardware or software to the processor to process. There are two types of interrupts that occur in the operating system
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Amazon Elasticsearch Domain Size Calculation

Introduction In this article, I would be describing the ES(Elasticsearch) terms necessary for understanding the calculation. After acquainting you about Amazon ES, I will tell you about how to calculate the minimum storage size and number of shards required for Elasticsearch with example. Elasticsearch Elasticsearch is an open-source analytics engine for use cases such as log analytics, real-time application monitoring and clickstream analytics. Node A Node is an EC2 instance. Elasticsearch Cluster Elasticsearch Cluster is a collection of one or more node(server) that holds the entire data and provides federated indexing and search capabilities across all nodes. Amazon Elasticsearch Amazon Elasticsearch is a managed service, which makes it easy to deploy, operate and scale Elasticsearch clusters in the AWS cloud. What Amazon Elasticsearch manages Amazon ES provisions all the resources for the Elasticsearch cluster and launches it.  It automatically
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