LXC configuration + useful hooks
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lxc-config/hooks/lib/lxc/container.rb

79 lines
2.8 KiB

require "erb"
require "netaddr"
require "pathname"
require "fileutils"
module Lxc
class Container
def initialize(data, name:, ipv4: nil, ipv6: nil, ula: nil, **options)
@data = data
@data["network"] ||= {}
@data["network"][name] = {}
zone = @data["zone"] || {}
@ipv4_subnet = NetAddr::CIDR.create(zone["ipv4-subnet"] || "192.168.10.0/24")
@ipv6_subnet = NetAddr::CIDR.create(zone["ipv6-subnet"] || "fd7d:aed0:18aa::/48")
@ula_subnet = NetAddr::CIDR.create(zone["ula-subnet"] || "fdc5:bdb8:b81::/48")
@container_root = Pathname.new(zone["lxc-root"]).join(name)
network = data["network"]
@name = name
@ipv4 = ipv4 || find_address(@ipv4_subnet, collect_subnets(network, "ipv4"))
@ipv6 = ipv6 || find_address(@ipv6_subnet, collect_subnets(network, "ipv6"))
@ula = ula || find_address(@ula_subnet, collect_subnets(network, "ula"))
@options = options
end
def write_config(config_path)
c = @data["network"][@name] || {}
c["ipv4"] = NetAddr::CIDR.create(@ipv4).to_s(Short: true)
c["ipv6"] = NetAddr::CIDR.create(@ipv6).to_s(Short: true)
c["ula"] = NetAddr::CIDR.create(@ula).to_s(Short: true)
c["group"] = @options[:group] if @options[:group]
c["vars"] = @options[:vars] if @options[:vars]
opts = @options.merge(name: @name,
ipv4: format_address(@ipv4, @ipv4_subnet.to_i(:netmask)),
ipv6: format_address(@ipv6, @ipv6_subnet.to_i(:netmask)),
ula: format_address(@ula, @ula_subnet.to_i(:netmask)))
config_dir = File.dirname(config_path)
local_conf = File.join(config_dir, "local.conf")
unless File.exists?(local_conf)
FileUtils.touch(local_conf)
end
opts[:local_conf] = local_conf
opts[:global_conf] = @data["zone"]["lxc-config"]
fstab = @container_root.join("fstab")
opts[:fstab] = fstab if File.exists?(fstab)
opts[:rootfs] = @data["zone"]["shared_rootfs"] || opts[:rootfs] || @container_root.join("rootfs")
templ = Template.new(CONFIG_ROOT.join("hooks", "templates", "config.erb"))
templ.write(config_path, opts)
end
private
def format_address(address, netmask)
NetAddr::CIDR.create(address, Mask: netmask).desc(IP: true, Short: true)
end
def collect_subnets(network, type)
addrs = []
network.each do |k,v|
if v[type]
addrs << NetAddr::CIDR.create(v[type])
end
end
addrs
end
def find_address(subnet, assigned_subnets)
subnet.enumerate(Limit: 1E4, Short: true)[1..1E4].each do |cidr|
assigned = assigned_subnets.find { |s| s.contains?(cidr) || s == cidr }
return cidr unless assigned
end
end
end
end