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mruby-rcon

mruby-rcon is a lightweight virtualization mrbgem for linux processes.

build rcon

rake

and create rcon binary into current directory.

example

# httpd.rb
Rcon.new({

  :command => "/usr/sbin/httpd -X",

  :resource => {

    # cgroup name
    :group => "httpd",

    # cgroup root path
    # centos "/cgroup" by default
    # ubuntu "/sys/fs/cgroup"
    :root => "/cgroup"

    # CPU [msec] exc: 30000 -> 30%
    :cpu_quota => 30000,

    # IO [Bytes/sec]
    :blk_dvnd => "202:0",
    :blk_rbps => 10485760,
    :blk_wbps => 10485760,

    # Memory [Bytes]
    :mem => 512 * 1024 * 1024,
    :oom => true,

  },

}).run
# callback memory limit event (default :oom)
# }).run_with_mem_eventfd do |ret|
#   puts "OOM KILLER!!! > #{ret}"
# end

# callback memory limit event for oom
# }).run_with_mem_eventfd(:oom) do |ret|
#   puts "OOM KILLER!!! > #{ret}"
# end

# callback memory limit event for usage(4MByte)
# }).run_with_mem_eventfd(:usage, 4 * 1024 * 1024) do |ret|
#   puts "Usage Up or Down to threadshould !!! > #{ret}"
# end

run

sudo ./rcon httpd.rb

auto memory expansion example

Virtualing.new({
#(snip)
  :resource => {
    #(snip)
    :oom => false,
  },
#(snip)
}).run_with_mem_eventfd_loop do |ret|
  puts "OOM KILLER!!! current memory: #{mem}"
  sleep 2
  c = Virtualing::MEMORY.new group
  mem = mem * 2
  c.limit_in_bytes = mem
  c.modify
  puts "current memory expand to #{mem}"
end

License

under the MIT License:

  • see LICENSE file

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lightweight virtualization tool for linux processes module for mruby

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