</variablelist>
</refsect1>
+ <refsect1>
+ <title>[DHCPServer] Section Options</title>
+
+ <para>This section configures the default setting of the DHCP server. The following options are available
+ in the [DHCPServer] section:</para>
+
+ <variablelist class='network-directives'>
+ <varlistentry>
+ <term><varname>PersistLeases=</varname></term>
+ <listitem>
+ <para>Specifies the default value for per-network <varname>PersistLeases=</varname>.
+ Takes a boolean. See for details in
+ <citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
+ Defaults to <literal>yes</literal>.</para>
+
+ <xi:include href="version-info.xml" xpointer="v256"/>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
<refsect1>
<title>See Also</title>
<para><simplelist type="inline">
Defaults to <literal>no</literal>. Further settings for the DHCP server may be set in the
[DHCPServer] section described below.</para>
- <para>Even if this is enabled, the DHCP server will not be started automatically. It will be
- started after <filename>systemd-networkd-persistent-storage.service</filename> is started, which
- calls <command>networkctl persistent-storage yes</command>. See
+ <para>Even if this is enabled, the DHCP server will not be started automatically and wait for the
+ persistent storage being ready to load/save leases in the storage, unless
+ <varname>RelayTarget=</varname> or <varname>PersistLeases=no</varname> are specified in the
+ [DHCPServer] section. It will be started after
+ <filename>systemd-networkd-persistent-storage.service</filename> is started, which calls
+ <command>networkctl persistent-storage yes</command>. See
<citerefentry><refentrytitle>networkctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
for more details.</para>
</listitem>
</varlistentry>
+ <varlistentry>
+ <term><varname>PersistLeases=</varname></term>
+ <listitem>
+ <para>Takes a boolean. When true, the DHCP server will load and save leases in the persistent
+ storage. When false, the DHCP server will neither load nor save leases in the persistent storage.
+ Hence, bound leases will be lost when the interface is reconfigured e.g. by
+ <command>networkctl reconfigure</command>, or <filename>systemd-networkd.service</filename>
+ is restarted. That may cause address conflict on the network. So, please take an extra care when
+ disable this setting. When unspecified, the value specified in the same setting in
+ <citerefentry><refentrytitle>networkd.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+ which defaults to <literal>yes</literal>, will be used.</para>
+
+ <xi:include href="version-info.xml" xpointer="v256"/>
+ </listitem>
+ </varlistentry>
+
</variablelist>
</refsect1>
return 0;
}
+static bool dhcp_server_persist_leases(Link *link) {
+ assert(link);
+ assert(link->manager);
+ assert(link->network);
+
+ if (in4_addr_is_set(&link->network->dhcp_server_relay_target))
+ return false; /* On relay mode. Nothing saved in the persistent storage. */
+
+ if (link->network->dhcp_server_persist_leases >= 0)
+ return link->network->dhcp_server_persist_leases;
+
+ return link->manager->dhcp_server_persist_leases;
+}
+
int address_acquire_from_dhcp_server_leases_file(Link *link, const Address *address, union in_addr_union *ret) {
struct in_addr a;
uint8_t prefixlen;
if (!link_dhcp4_server_enabled(link))
return -ENOENT;
+ if (!dhcp_server_persist_leases(link))
+ return -ENOENT;
+
if (link->manager->persistent_storage_fd < 0)
return -EBUSY; /* The persistent storage is not ready, try later again. */
/* TODO: Maybe, also check the system time is synced. If the system does not have RTC battery, then
* the realtime clock in not usable in the early boot stage, and all saved leases may be wrongly
* handled as expired and dropped. */
- if (!sd_dhcp_server_is_in_relay_mode(link->dhcp_server)) {
+ if (dhcp_server_persist_leases(link)) {
if (link->manager->persistent_storage_fd < 0)
return 0; /* persistent storage is not ready. */
HASHMAP_FOREACH(link, manager->links_by_index) {
if (!link->dhcp_server)
continue;
- if (sd_dhcp_server_is_in_relay_mode(link->dhcp_server))
+ if (!dhcp_server_persist_leases(link))
continue;
/* Even if 'start' is true, first we need to stop the server. Otherwise, we cannot (re)set
DHCPv4.DUIDRawData, config_parse_duid_rawdata, 0, offsetof(Manager, dhcp_duid)
DHCPv6.DUIDType, config_parse_duid_type, 0, offsetof(Manager, dhcp6_duid)
DHCPv6.DUIDRawData, config_parse_duid_rawdata, 0, offsetof(Manager, dhcp6_duid)
+DHCPServer.PersistLeases, config_parse_bool, 0, offsetof(Manager, dhcp_server_persist_leases)
/* Deprecated */
DHCP.DUIDType, config_parse_manager_duid_type, 0, 0
DHCP.DUIDRawData, config_parse_manager_duid_rawdata, 0, 0
.dhcp_duid.type = DUID_TYPE_EN,
.dhcp6_duid.type = DUID_TYPE_EN,
.duid_product_uuid.type = DUID_TYPE_UUID,
+ .dhcp_server_persist_leases = true,
.ip_forwarding = { -1, -1, },
};
bool manage_foreign_routes;
bool manage_foreign_rules;
bool manage_foreign_nexthops;
+ bool dhcp_server_persist_leases;
Set *dirty_links;
Set *new_wlan_ifindices;
DHCPServer.BootServerName, config_parse_dns_name, 0, offsetof(Network, dhcp_server_boot_server_name)
DHCPServer.BootFilename, config_parse_string, CONFIG_PARSE_STRING_SAFE_AND_ASCII, offsetof(Network, dhcp_server_boot_filename)
DHCPServer.RapidCommit, config_parse_bool, 0, offsetof(Network, dhcp_server_rapid_commit)
+SHCPServer.PersistLeases, config_parse_tristate, 0, offsetof(Network, dhcp_server_persist_leases)
DHCPServerStaticLease.Address, config_parse_dhcp_static_lease_address, 0, 0
DHCPServerStaticLease.MACAddress, config_parse_dhcp_static_lease_hwaddr, 0, 0
Bridge.Cost, config_parse_uint32, 0, offsetof(Network, cost)
.dhcp_server_emit_router = true,
.dhcp_server_emit_timezone = true,
.dhcp_server_rapid_commit = true,
+ .dhcp_server_persist_leases = -1,
.router_lifetime_usec = RADV_DEFAULT_ROUTER_LIFETIME_USEC,
.router_dns_lifetime_usec = RADV_DEFAULT_VALID_LIFETIME_USEC,
char *dhcp_server_boot_filename;
usec_t dhcp_server_ipv6_only_preferred_usec;
bool dhcp_server_rapid_commit;
+ int dhcp_server_persist_leases;
/* link-local addressing support */
AddressFamily link_local;
[DHCPv6]
#DUIDType=vendor
#DUIDRawData=
+
+[DHCPServer]
+#PersistLeases=yes