The introduction of mRuby on Container /mruby-on-container

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*OTUBMMBUJPO w 1BDLBHFTBSFBWBJMBCMFJOQBDLBHFDMPVE  IUUQTQBDLBHFDMPVEJPVE[VSBIBDPOJXBJOTUBMM # example for deb-ish distro curl
-s https://packagecloud.io/install/repositories/udzura/ haconiwa/script.deb.sh | sudo bash apt-get update apt-get install haconiwa apt-get install lxc lxc-templates # Required to bootstrap fs

'JSTU DSFBUFUIFDPOpHpMFGSPNCPJMFSQMBUF $ haconiwa new test.haco assign new haconiwa name
= haconiwa-0491a405 assign rootfs location = /var/lib/haconiwa/0491a405 create test.haco

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*OTUBMMTTIE DIBOHFTTIEDPOpH Haconiwa.define do |config|  #...  config.provision do |p| p.run_shell
<<-SHELL apk add --update openssh sed -i 's/#Port.*/Port 2222/' /etc/ssh/sshd_config # NOTE: insecure but an example below sed -i 's/#PermitRootLogin.*/PermitRootLogin yes/' /etc/ssh/sshd_config sed -i 's/#PasswordAuthentication.*/PasswordAuthentication yes/' /etc/ssh/sshd_config echo root:r00t | chpasswd ssh-keygen -t rsa -P "" -f /etc/ssh/ssh_host_rsa_key SHELL end #... end

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$IBOHFlJOJUzDPNNBOEUPTTIE UIFOJOWPLFlSVOz Haconiwa.define do |config| # The container name and
container's hostname: config.name = "haconiwa-0491a405" # The first process when invoking haconiwa run: # config.init_command = "/bin/bash" # To: config.init_command = %w(/usr/sbin/sshd -D) # And uncomment: config.daemonize!  #...  end $ haconiwa run test.haco

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/BNFTQBDFVOTIBSFUPTFF654OBNFTQBDF puts "Before unshare:" RunCmd.new("sample1").run "uname -a" # This puts
“localhost” # Then unsure the UTS namespace Namespace.unshare Namespace::CLONE_NEWUTS Procutil.sethostname "rubykaigi.example.org" puts "After new namespace:" RunCmd.new("sample1").run "uname -a" # This puts “rubykaigi.example.org” and parent remains unchanged

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/BNFTQBDF DISPPUTNBMMFTUDPOUBJOFS # The smallest container with mruby: Namespace.unshare(Namespace::CLONE_NEWNS|Namespace::CLONE_NEWPID) m
= Mount.new m.make_private "/" root = "/var/lib/haconiwa/125f23ef" m.bind_mount root, root, readonly: true # To make readonly Dir.chroot root Dir.chdir "/" c = Process.fork { m.mount "proc", "/proc", :type => "proc" Exec.exec "/bin/sh" } puts "Container exited: #{Process.waitpid2(c).inspect}"

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FHDQVTFUMJNJUBUJPOCZDHSPVQ cpuset = Cgroup::CPUSET.new "rubykaigi001" cpuset.cpus = "0-1"; cpuset.mems =
"0" cpuset.create # Comment out to use full-core cpuset.attach def fib(n); n < 2 ? 1 : fib(n-2) + fib(n-1); end procs = (1..4).to_a.map do Process.fork do loop { fib(rand(1000)) } end end procs.each {|pid| Process.waitpid pid }

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&YBNQMFNSVCZMJOVYOBNFTQBDF w 8SJUFBTNBMMGVODUJPOXJUIBOBJWFVTFPGTFUOT w 5IFOBUUBDIUPBNPEVMF static mrb_value mrb_namespace_setns_by_fd(mrb_state
*mrb, mrb_value self) { mrb_int fileno, nstype; int ret; mrb_get_args(mrb, "ii", &fileno, &nstype); ret = setns((int)fileno, (int)nstype); if (ret < 0) { mrb_sys_fail(mrb, "setns failed"); } return mrb_fixnum_value(ret); } /* ... */ void mrb_mruby_namespace_gem_init(mrb_state *mrb) { struct RClass *namespace; namespace = mrb_define_class(mrb, "Namespace", mrb->object_class); mrb_define_class_method(mrb, namespace, "setns_by_fd", mrb_namespace_setns_by_fd, MRB_ARGS_REQ(2)); }

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= options[:fd] pid = options[:pid] if fd setns_by_fd(fd, flag) elsif pid setns_by_pid(pid, flag) else raise ArgumentError, "Options :fd or :pid must be specified" end end end

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1SFQBSFDPOUBJOFSCBTFBT Haconiwa.define do |config| suffix = UUID.secure_uuid("%4x%4x") config.name = "haconiwa-#{suffix}"
config.init_command = ["/bin/sleep", UUID.secure_random(30..60).to_s] config.daemonize! root = Pathname.new("/var/lib/haconiwa/common") config.chroot_to root #... end

1SFQBSFXBUDIFS%4-BT Haconiwa.watch do |config| config.watch :cluster do |event| if event.cluster.count
< 5 # Should be spawned 1 by 1 Haconiwa.spawn "/etc/haconiwa/haco.d/sleeper.haco" end end end

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The introduction of mRuby on Container /mruby-on-container

The introduction of mRuby on Container /mruby-on-container

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