Class: LXCWrapper::ConfigFile

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# File 'lib/distem/wrapper/lxc/configfile.rb', line 21

def self.generate(vnode,filepath,distempnode)
  # Write lxc config file
  File.open(filepath, 'w') do |f|
    f.puts DEFAULT_DEV_RULES
    f.puts "lxc.utsname = #{vnode.name}"
    if vnode.filesystem.shared
      f.puts "lxc.rootfs = #{vnode.filesystem.sharedpath}"
    else
      f.puts "lxc.rootfs = #{vnode.filesystem.path}"
    end

    Distem::Lib::Shell.run("mkdir -p #{PATH_LOG_DIR}") unless File.directory?(PATH_LOG_DIR)

    f.puts "lxc.mount.entry=proc #{vnode.filesystem.path}/proc " \
      "proc nodev,noexec,nosuid 0 0"
    f.puts "lxc.mount.entry=sysfs #{vnode.filesystem.path}/sys " \
      "sysfs defaults  0 0"
    f.puts "lxc.mount.entry=devpts #{vnode.filesystem.path}/dev/pts " \
      "devpts defaults 0 0"
    # Not necessary at the moment
    # f.puts "lxc.mount.entry=devshm #{vnode.filesystem.path}/dev/shm " \
    #  "tmpfs defaults 0 0"
    # f.puts "lxc.mount.entry=uniq #{vnode.filesystem.path}/home/my " \
    #  "none defaults 0 0"
    f.puts "lxc.console = #{File.join(PATH_LOG_DIR,vnode.name)}"

    vnode.vifaces.each do |viface|
      f.puts "lxc.network.type = veth"
      viface_bridge = nil
      case viface.vnetwork.opts['network_type']
      when 'classical'
        if viface.vnetwork.opts.has_key?('root_interface')
          viface_bridge = distempnode.linux_bridges[viface.vnetwork.opts['root_interface']]
        else
          viface_bridge = distempnode.linux_bridges[distempnode.default_network_interface]
        end
      when 'vxlan'
        viface_bridge = Distem::Lib::NetTools::VXLAN_BRIDGE_PREFIX.to_s + viface.vnetwork.opts['vxlan_id'].to_s
      else
        raise
      end
      f.puts "lxc.network.link = #{viface_bridge}"
      f.puts "lxc.network.name = #{viface.name}"
      f.puts "lxc.network.flags = up"
      f.puts "lxc.network.hwaddr = #{viface.macaddress}"
      f.puts "lxc.network.veth.pair = #{Distem::Lib::NetTools.get_iface_name(vnode,viface)}"
      f.puts "lxc.network.ipv4 = #{viface.address.to_string}"
    end

    if vnode.vcpu
      cores = ""
      vnode.vcpu.vcores.each_value { |vcore| cores += "#{vcore.pcore.physicalid}," }
      cores.chop! unless cores.empty?
      f.puts "lxc.cgroup.cpuset.cpus = #{cores}"
    end

    # Warning, this is working only since Wheezy, and the cgroup_enable=memory kernel parameter must be added on the kernel command line
    if vnode.vmem
      f.puts "lxc.cgroup.memory.limit_in_bytes = #{vnode.vmem['mem']}M" if vnode.vmem.has_key?('mem') && vnode.vmem['mem'] != ''
      # This is not working on Debian wheezy, even with the swapaccount=1 kernel paramater. Mayber LXC 0.9 is required
      #f.puts "lxc.cgroup.memory.memsw.limit_in_bytes = #{vnode.vmem['swap']}M" if vnode.vmem.has_key?('swap') && vnode.vmem['swap'] != ''
    end

    #Deal with an issue when using systemd (infinite loop inducing high CPU load)
    #http://serverfault.com/questions/658052/systemd-journal-in-debian-jessie-lxc-container-eats-100-cpu
    if system('lxc-start --version')
      lxc_major_version = `lxc-start --version`.split('.').first
      if lxc_major_version == '1'
        f.puts "lxc.autodev = 1"
        f.puts "lxc.kmsg = 0"
      end
    end
  end
end