Sample Cron Service in Elixir

Checking whether given website is alive every couple of seconds

Running observer by connecting to running host (example)

• elixir --name wsieroci@127.0.0.1 --cookie cookie1 -S mix run --no-halt
• iex --name wsieroci_remote@127.0.0.1 --cookie cookie1 --remsh wsieroci@127.0.0.1
• :observer.start

Executing actions on running instance

Cron.WebsiteChecker.set(:simple_checker, 101)

Code reloading

• :sys.suspend(:simple_checker)
• c "lib/cron/website_checker.ex"
• :sys.change_code(:simple_checker, Cron.WebsiteChecker, "https://www.polidea.com", [:param])
• :sys.resume(:simple_checker)

Many nodes

• iex --sname node1

• iex --sname node2

• iex --sname node3

• Node.connect :"node2@Wiktors-MacBook-Pro-2"

• Node.connect :"node3@Wiktors-MacBook-Pro-2"

• Node.list

• :rpc.multicall(:inets, :start, [])

• :rpc.multicall(:httpc, :request, ['http://api.icndb.com/jokes/random'])