module Azure::ARM::VnetConfig
Public Instance Methods
add new subnet into the existing virtual network ##
# File lib/azure/resource_management/vnet_config.rb, line 189 def add_subnet(subnet_name, vnet_config, subnets) new_subnet_prefix = nil vnet_address_prefix_count = 0 vnet_address_space = vnet_config[:addressPrefixes] ## search for space in all the address prefixes of the virtual network ## while new_subnet_prefix.nil? && vnet_address_space.length > vnet_address_prefix_count new_subnet_prefix = new_subnet_address_prefix( vnet_address_space[vnet_address_prefix_count], subnets_list_for_specific_address_space( vnet_address_space[vnet_address_prefix_count], subnets ) ) vnet_address_prefix_count += 1 end if new_subnet_prefix ## found space for new subnet ## vnet_config[:subnets].push( subnet(subnet_name, new_subnet_prefix) ) else ## no space available in the virtual network for the new subnet ## raise "Unable to add subnet #{subnet_name} into the virtual network #{vnet_config[:virtualNetworkName]}, no address space available !!!" end vnet_config end
virtual network configuration creation for the new vnet creation or to handle existing vnet ##
# File lib/azure/resource_management/vnet_config.rb, line 218 def create_vnet_config(resource_group_name, vnet_name, vnet_subnet_name) raise ArgumentError, "GatewaySubnet cannot be used as the name for --azure-vnet-subnet-name option. GatewaySubnet can only be used for virtual network gateways." if vnet_subnet_name == "GatewaySubnet" vnet_config = {} subnets = nil flag = true ## check whether user passed or default named virtual network exist or not ## vnet = get_vnet(resource_group_name, vnet_name) vnet_config[:virtualNetworkName] = vnet_name if vnet ## handle resources in the existing virtual network ## vnet_config[:addressPrefixes] = vnet_address_spaces(vnet) vnet_config[:subnets] = [] subnets = subnets_list(resource_group_name, vnet_name) if subnets subnets.each do |subnet| flag = false if subnet.name == vnet_subnet_name ## given subnet already exist in the virtual network ## ## preserve the existing subnet resources ## vnet_config[:subnets].push( subnet(subnet.name, subnet_address_prefix(subnet)) ) end end else ## create config for new vnet ## vnet_config[:addressPrefixes] = [ "10.0.0.0/16" ] vnet_config[:subnets] = [] vnet_config[:subnets].push( subnet(vnet_subnet_name, "10.0.0.0/24") ) flag = false end ## given subnet does not exist, so create new one in the virtual network ## vnet_config = add_subnet(vnet_subnet_name, vnet_config, subnets) if flag vnet_config end
when a address space in an existing virtual network is not used at all then divide the space into the number of subnets based on the total number of hosts that network supports ##
# File lib/azure/resource_management/vnet_config.rb, line 110 def divide_network(address_prefix) network_address = IPAddress(address_prefix) prefix = nil case network_address.count when 4097..65536 prefix = "20" when 256..4096 prefix = "24" end ## if the given network is small then do not divide it else divide using ## the prefix value calculated above ## prefix.nil? ? address_prefix : network_address.network.address.concat("/" + prefix) end
# File lib/azure/resource_management/vnet_config.rb, line 38 def get_vnet(resource_group_name, vnet_name) network_resource_client.virtual_networks.get(resource_group_name, vnet_name) rescue MsRestAzure::AzureOperationError => error if error.body err_json = JSON.parse(error.response.body) if err_json["error"]["code"] == "ResourceNotFound" false else raise error end end end
check if the available_network is part of the subnet_network or vice-versa ##
# File lib/azure/resource_management/vnet_config.rb, line 127 def in_use_network?(subnet_network, available_network) (subnet_network.include? available_network) || (available_network.include? subnet_network) end
calculate and return address_prefix for the new subnet to be added in the existing virtual network ##
# File lib/azure/resource_management/vnet_config.rb, line 134 def new_subnet_address_prefix(vnet_address_prefix, subnets) if subnets.empty? ## no subnets exist in the given address space of the virtual network, so divide the network into smaller subnets (based on the network size) and allocate space for the new subnet to be added ## divide_network(vnet_address_prefix) else ## subnets exist in vnet, calculate new address_prefix for the new subnet based on the space taken by these existing subnets under the given address space of the virtual network ## vnet_network_address = IPAddress(vnet_address_prefix) subnets = sort_subnets_by_cidr_prefix(subnets) available_networks_pool = [] used_networks_pool = [] subnets.each do |subnet| ## in case the larger network is not divided into smaller subnets but ## divided into only 1 largest subnet of the complete network size ## if vnet_network_address.prefix == subnet_cidr_prefix(subnet) break end ## add all the possible subnets (calculated using the current subnet's ## cidr prefix value) into the available_networks_pool ## available_networks_pool.push( vnet_network_address.subnet(subnet_cidr_prefix(subnet)) ).flatten!.uniq! { |nwrk| [ nwrk.network.address, nwrk.prefix ].join(":") } ## add current subnet into the used_networks_pool ## used_networks_pool.push( IPAddress(subnet_address_prefix(subnet)) ) ## sort both the network pools before trimming the available_networks_pool ## available_networks_pool, used_networks_pool = sort_pools( available_networks_pool, used_networks_pool ) ## trim the available_networks_pool based on the networks already ## allocated to the existing subnets ## used_networks_pool.each do |subnet_network| available_networks_pool.delete_if do |available_network| in_use_network?(subnet_network, available_network) end end ## sort both the network pools after trimming the available_networks_pool ## available_networks_pool, used_networks_pool = sort_pools( available_networks_pool, used_networks_pool ) end ## space available in the vnet_address_prefix network for the new subnet ## if !available_networks_pool.empty? && available_networks_pool.first.network? available_networks_pool.first.network.address.concat("/" + available_networks_pool.first.prefix.to_s) else ## space not available in the vnet_address_prefix network for the new subnet ## nil end end end
sort available networks pool in ascending order based on the network's IP address to allocate the network for the new subnet to be added in the existing virtual network ##
# File lib/azure/resource_management/vnet_config.rb, line 80 def sort_available_networks(available_networks) available_networks.sort_by { |nwrk| nwrk.network.address.split(".").map(&:to_i) } end
method to invoke respective sort methods for the network pools ##
# File lib/azure/resource_management/vnet_config.rb, line 103 def sort_pools(available_networks_pool, used_networks_pool) [sort_available_networks(available_networks_pool), sort_used_networks_by_hosts_size(used_networks_pool)] end
sort existing subnets in ascending order based on their cidr prefix or netmask to have subnets with larger networks on the top ##
# File lib/azure/resource_management/vnet_config.rb, line 86 def sort_subnets_by_cidr_prefix(subnets) subnets.sort_by.with_index { |sbn, i| [subnet_address_prefix(sbn).split("/")[1].to_i, i] } end
sort used networks pool in descending order based on the number of hosts it contains, this helps to keep larger networks on top thereby eliminating more number of entries in available_networks_pool at a faster pace ##
# File lib/azure/resource_management/vnet_config.rb, line 93 def sort_used_networks_by_hosts_size(used_network) used_network.sort_by.with_index { |nwrk, i| [-nwrk.hosts.size, i] } end
single subnet body creation to be added in template ##
# File lib/azure/resource_management/vnet_config.rb, line 58 def subnet(subnet_name, subnet_prefix) { "name" => subnet_name, "properties" => { "addressPrefix" => subnet_prefix, }, } end
return address prefix of a subnet ##
# File lib/azure/resource_management/vnet_config.rb, line 73 def subnet_address_prefix(subnet) subnet.address_prefix end
return the cidr prefix or netmask of the given subnet ##
# File lib/azure/resource_management/vnet_config.rb, line 98 def subnet_cidr_prefix(subnet) subnet_address_prefix(subnet).split("/")[1].to_i end
lists all subnets under a virtual network or lists subnets of only a particular address space ##
# File lib/azure/resource_management/vnet_config.rb, line 52 def subnets_list(resource_group_name, vnet_name, address_prefix = nil) list = network_resource_client.subnets.list(resource_group_name, vnet_name) !address_prefix.nil? && !list.empty? ? subnets_list_for_specific_address_space(address_prefix, list) : list end
lists subnets of only a specific virtual network address space ##
# File lib/azure/resource_management/vnet_config.rb, line 25 def subnets_list_for_specific_address_space(address_prefix, subnets_list) list = [] address_space = IPAddress(address_prefix) subnets_list.each do |sbn| subnet_address_prefix = IPAddress(sbn.address_prefix) ## check if the subnet belongs to this address space or not ## list << sbn if address_space.include? subnet_address_prefix end list end
return all the address prefixes under a virtual network ##
# File lib/azure/resource_management/vnet_config.rb, line 68 def vnet_address_spaces(vnet) vnet.address_space.address_prefixes end