HOWTO run Erlang Code
- Start up the Erlang Shell. Windows: werl.exe or "erl" in command prompt if you added it to PATH. Linux: "erl" command.
- Change directory to that of the file you wish to compile and run. pwd(). prints current directory.
- Compile the code. c(MODULE_NAME).
- Run it.
Depending on your preferred working environment, start Erlang/OTP in one of the following ways:
- On a Unix system you enter the command erl at the operating system prompt. This command starts the Erlang runtime system and the Erlang shell.
- On the Windows platform you normally start Erlang/OTP from the start menu.
Erlang is a programming language used to build massively scalable soft real-time systems with requirements on high availability. Some of its uses are in telecoms, banking, e-commerce, computer telephony and instant messaging.
Click on the above highlighted rabbitmq-server-x.x.xx.exe file to download, after downloading double click on the .exe file to install. Then you would see the below installation wizard. Select RabbitMQ Service, Start Menu options and click on the Next button.
Procedure
- Log in to your Windows machine as the user who installed vFabric RabbitMQ server, such as the Administrator.
- From the Windows Start menu, select All Programs > RabbitMQ Server > Start Service to start the RabbitMQ server.
config file(s) : c:/ProgramData/RabbitMQ/rabbitmq. conf.
C) Check if there is a RabbitMQ node running by following these steps:
- Open a command-line console (run as Administrator) and change to the RabbitMQ batch scripts folder.
- Run the following command: rabbitmqctl.bat status.
- If the rabbitmq@<machine_name> node is not running, run the following command to start it:
To restart a single RabbitMQ node:
- Gracefully stop rabbitmq-server on the target node: systemctl stop rabbitmq-server.
- Verify that the node is removed from the cluster and RabbitMQ is stopped on this node: rabbitmqctl cluster_status. Example of system response:
- Start rabbitmq-server : systemctl start rabbitmq-server.
C) Check if there is a RabbitMQ node running by following these steps:
- Open a command-line console (run as Administrator) and change to the RabbitMQ batch scripts folder.
- Run the following command: rabbitmqctl.bat status.
- If the rabbitmq@<machine_name> node is not running, run the following command to start it:
Procedure
- Log in as the root user and open a terminal window.
- Start the RabbitMQ server using the /sbin/service rabbitmq-server command, passing it the start option.
- To stop the server: prompt# /sbin/service rabbitmq-server stop.
- To get status about the server (only partial output shown):
Use RabbitMQ management UI or rabbitmq-diagnostics status to find when a node stores its log file(s). The RABBITMQ_LOGS variable value can be either a file path or a hyphen (-). RABBITMQ_LOGS=- will result in all log messages being sent to standard output. See Logging to Console (Standard Output).
The Erlang cookie is a shared secret used for authentication between RabbitMQ nodes and CLI tools. The value is stored in a file commonly referred to as the Erlang cookie file. The cookie file used by the service account and the user running rabbitmqctl. bat must be synchronised for CLI tools such as rabbitmqctl.
There are two ways to quit out of an Interactive Elixir shell. The standard way is with Ctrl-c . This gives you a list of options, one of which is a for abort. This will terminate your IEx session and drop you back on the command line where the process started.
Erlang is a trusted and stable language used to run core procedures within major systems, invented at Ericsson. Erlang (and Elixir) are used by many industries within many areas, including Fintech, Security, Blockchain and IoT.
Code in Parallel
In using Erlang, WhatsApp is part of a larger push towards programming languages that are designed for concurrency, where many processes run at the same time. In essence, WhatsApp is a replacement for telecoms' texting services. Like Haskell, Erlang is a product of the '80s.One reason Erlang may be declining is because of newer functional programming languages, such as Elixir or Elm. Although Erlang is certainly useful, it's less accessible for beginners.
1.5 Who uses Erlang for product development? The largest user of Erlang is Ericsson. Ericsson use it to write software used in telecommunications systems. Many (dozens) projects have used it, a particularly large one is the extremely scaleable AXD301 ATM switch.
Yes, it is worth learning. Erlang is a general-purpose programming language and runtime environment. Erlang has built-in support for concurrency, distribution and fault tolerance. It is widely used because it is necessary to understand the required capacity in a network to be able to provision correctly for it.
Erlang (/ˈ?ːrlæŋ/ UR-lang) is a general-purpose, concurrent, functional programming language, and a garbage-collected runtime system.
Java is a general-purpose computer programming language that is concurrent, class-based, object-oriented, and specifically designed to have as few implementation dependencies as possible.
Erlang is not very hard to learn. Elixir is Erlang in more pragmatic. It uses the same VM. You can natively use all Erlang libraries and you can achieve things much easier with much less configuration and code.