class nodo::subsystem::sysctl {
  class { 'nodo::subsystem::sysctl::panic': }
  class { 'nodo::subsystem::sysctl::disable_ipv6': }
  class { 'nodo::subsystem::sysctl::tcp_challenge_ack_limit': }
  class { 'nodo::subsystem::sysctl::unprivileged_bpf_disabled': }

  # Root exploit fix, see http://wiki.debian.org/mmap_min_addr
  # Maybe this can be remove in the future or included in a sysctl puppet module
  file { "/etc/sysctl.d/mmap_min_addr.conf":
    owner   => "root",
    group   => "root",
    mode    => '0644',
    ensure  => present,
    content => "vm.mmap_min_addr = 4096\n",
  }

  # See http://www.linux-vserver.org/Frequently_Asked_Questions
  file { "/etc/sysctl.d/net.ipv4.conf.all.promote_secondaries.conf":
    owner   => "root",
    group   => "root",
    mode    => '0644',
    ensure  => present,
    content => "net.ipv4.conf.all.promote_secondaries = 1\n",
  }

  exec { "/etc/init.d/procps restart":
    subscribe   => File["/etc/sysctl.d/mmap_min_addr.conf", "/etc/sysctl.d/net.ipv4.conf.all.promote_secondaries.conf"],
    refreshonly => true,
  }

  $printk_levels = '3 4 1 3'

  file { "/etc/sysctl.d/kernel.printk.conf":
    owner   => "root",
    group   => "root",
    mode    => '0644',
    ensure  => present,
    content => "kernel.printk = ${printk_levels}\n",
  }

  exec { "/bin/echo '${printk_levels}' > /proc/sys/kernel/printk":
    subscribe   => File["/etc/sysctl.d/kernel.printk.conf"],
    refreshonly => true,
  }
}