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Virtualization The technology that lies at the core of all cloud operations is virtualization. Virtualization lets you divide the hardware resources of a single physical server into smaller units. That physical server could therefore host multiple virtual machines (VMs) running their own complete operating systems, each with its own memory, storage, and network access. a virtual machine host Cloud Computing Major cloud providers like AWS have enormous server farms where hundreds of thousands of servers and disk drives are maintained along with the network cabling necessary to connect them. A well-built virtualized environment could provide a virtual server using storage, memory, compute cycles, and network bandwidth collected from the most efficient mix of available sources it can find. A cloud computing platform offers on-demand, self-service access to pooled compute resources where your usage is metered and billed according to the volume you consume. Cloud computing systems allow for precise billing models, sometimes involving fractions of a penny for an hour of consumption. ...

My Use case To establish a seamless synchronization of project files between a MacBook (working station) and a Raspberry Pi (hosting server), allowing for automatic updates and accessibility of the project from both devices. device/tool version DS420+ DSM 7.2-64570 Raspberry PI 400 The user begins working on the project using the IDE on the MacBook, editing and updating project files within the synchronized folder. As changes are made, they are automatically reflected in the synchronized folder and accessible on the Raspberry Pi in read-only mode. ...

Traefik v1.7 is running within a Docker Swarm, functioning as a global service. Consequently, an instance of Traefik is deployed for each host within our Docker Swarm cluster. It is important to note that the Swarm’s routing mesh is not employed in this setup. Instead, the port mode is configured as “host,” allowing the port to be attached to the host’s network. traefik: image: ${REGISTRY}/traefik:1.6 build: ./traefik volumes: - /var/run/docker.sock:/var/run/docker.sock networks: - traefik environment: - AWS_ACCESS_KEY_ID=${AWS_ACCESS_KEY_ID} - AWS_SECRET_ACCESS_KEY=${AWS_SECRET_ACCESS_KEY} - AWS_REGION=${AWS_REGION} - AWS_HOSTED_ZONE_ID=${AWS_HOSTED_ZONE_ID} ports: - target: 80 published: 80 protocol: tcp mode: host - target: 443 published: 443 mode: host protocol: tcp - target: 8080 published: 8080 mode: host protocol: tcp deploy: mode: global restart_policy: condition: on-failure Docker Swarm deployed to AWS and lives behind internal/external load balancers (Classic type). ...

What you will learn today 🦦: what is Traefik and why I decisively recommend to use it with Docker Swarm how to show custom error page if Traefik returns 404 (service not found) How I met Traefik 😁 Traefik is a top modern reverse proxy and load balancer. I started to use it from major version 1. At that moment, I already had Docker Swarm cluster, which I began to prepare for production use, and only one thing in the coherent picture has been left: “External Load Balancer”. Official docker doc had an example with HaProxy so it was obvious to try it out first. As I remember it took a significant amount of time to get HaProxy works smoothly with Swarm. But I wasn’t satisfied with the result: ...

Task description on Codesignal I’ve spend decent amount of time in order to figure out that I don’t need any string manipulation in this task 😅. My first try was adding missing zeros to the beginning of number slot, convert int to str and back, then the resulting string split by 4 but no luck … It turned out that is simple math 😀 I wanna share my solution with detailed comments ⬇️ (Time complexity O(n) ) ...

1 Add tools specifically to php monitoring in order to answer the questions ⬇️ what kind of php scripts were called most of the time? what kind of php scripts took the most CPU? We choose open-source tool Pinba. php pinba extension sends data over UDP in protobuf format. pinba server accumulates and processes data and send it to data storage in your choice. (In our case it is Clickhouse DB) ...

Into 💆 Pre-conditions: macOS Sierra Docker CE Version 17.06.2-ce-mac27 PHP 7.1.8 XDebug v2.5.0 PhpStorm 2017.2 If you want to set up remote debug from your container you have 2 options: xdebug.remote_host = %host_ip% %host_ip% — The IP of the machine running your IDE. It’s assumed on the same host as Docker. xdebug.remote_connect_back = on checks $_SERVER[‘HTTP_X_FORWARDED_FOR’] and $_SERVER[‘REMOTE_ADDR’] variables to find out which IP address to use. You cannot use xdebug.remote_connect_back because it takes containers’s internal IP. So xdebug.remote_host is the only option we have. It’s pretty simple to get host IP on Linux OS just look at : ifconfig > docker0. Moreover you can create a fixed set of IPs for both host and containers using docker network. For instance: ...