# SPDX-License-Identifier: GPL-2.0-only
#
# IP Virtual Server configuration
#
menuconfig IP_VS
tristate "IP virtual server support"
depends on INET && NETFILTER
depends on (NF_CONNTRACK || NF_CONNTRACK=n)
help
IP Virtual Server support will let you build a high-performance
virtual server based on cluster of two or more real servers. This
option must be enabled for at least one of the clustered computers
that will take care of intercepting incoming connections to a
single IP address and scheduling them to real servers.
Three request dispatching techniques are implemented, they are
virtual server via NAT, virtual server via tunneling and virtual
server via direct routing. The several scheduling algorithms can
be used to choose which server the connection is directed to,
thus load balancing can be achieved among the servers. For more
information and its administration program, please visit the
following URL: <http://www.linuxvirtualserver.org/>.
If you want to compile it in kernel, say Y. To compile it as a
module, choose M here. If unsure, say N.
if IP_VS
config IP_VS_IPV6
bool "IPv6 support for IPVS"
depends on IPV6 = y || IP_VS = IPV6
select NF_DEFRAG_IPV6
help
Add IPv6 support to IPVS.
Say Y if unsure.
config IP_VS_DEBUG
bool "IP virtual server debugging"
help
Say Y here if you want to get additional messages useful in
debugging the IP virtual server code. You can change the debug
level in /proc/sys/net/ipv4/vs/debug_level
config IP_VS_TAB_BITS
int "IPVS connection table size (the Nth power of 2)"
range 8 20 if !64BIT
range 8 27 if 64BIT
default 12
help
The IPVS connection hash table uses the chaining scheme to handle
hash collisions. Using a big IPVS connection hash table will greatly
reduce conflicts when there are hundreds of thousands of connections
in the hash table.
Note the table size must be power of 2. The table size will be the
value of 2 to the your input number power. The number to choose is
from 8 to 27 for 64BIT(20 otherwise), the default number is 12,
which means the table size is 4096. Don't input the number too
small, otherwise you will lose performance on it. You can adapt the
table size yourself, according to your virtual server application.
It is good to set the table size not far less than the number of
connections per second multiplying average lasting time of
connection in the table. For example, your virtual server gets 200
connections per second, the connection lasts for 200 seconds in
average in the connection table, the table size should be not far
less than 200x200, it is good to set the table size 32768 (2**15).
Another note that each connection occupies 128 bytes effectively and
each hash entry uses 8 bytes, so you can estimate how much memory is
needed for your box.
You can overwrite this number setting conn_tab_bits module parameter
or by appending ip_vs.conn_tab_bits=? to the kernel command line if
IP VS was compiled built-in.
comment "IPVS transport protocol load balancing support"
config IP_VS_PROTO_TCP
bool "TCP load balancing support"
help
This option enables support for load balancing TCP transport
protocol. Say Y if unsure.
config IP_VS_PROTO_UDP
bool "UDP load balancing support"
help
This option enables support for load balancing UDP transport
protocol. Say Y if unsure.
config IP_VS_PROTO_AH_ESP
def_bool IP_VS_PROTO_ESP || IP_VS_PROTO_AH
config IP_VS_PROTO_ESP
bool "ESP load balancing support"
help
This option enables support for load balancing ESP (Encapsulation
Security Payload) transport protocol. Say Y if unsure.
config IP_VS_PROTO_AH
bool "AH load balancing support"
help
This option enables support for load balancing AH (Authentication
Header) transport protocol. Say Y if unsure.
config IP_VS_PROTO_SCTP
bool "SCTP load balancing support"
select LIBCRC32C
help
This option enables support for load balancing SCTP transport
protocol. Say Y if unsure.
comment "IPVS scheduler"
config IP_VS_RR
tristate "round-robin scheduling"
help
The robin-robin scheduling algorithm simply directs network
connections to different real servers in a round-robin manner.
If you want to compile it in kernel, say Y. To compile it as a
module, choose M here. If unsure, say N.
config IP_VS_WRR
tristate "weighted round-robin scheduling"
help
The weighted robin-robin scheduling algorithm directs network
connections to different real servers based on server weights
in a round-robin manner. Servers with higher weights receive
new connections first than those with less weights, and servers
with higher weights get more connections than those with less
weights and servers with equal weights get equal connections.
If you want to compile it in kernel, say Y. To compile it as a
module, choose M here. If unsure, say N.
config IP_VS_LC
tristate "least-connection scheduling"
help
The least-connection scheduling algorithm directs network
connections to the server with the least number of active
connections.
If you want to compile it in kernel, say Y. To compile it as a
module, choose M here. If unsure, say N.
config IP_VS_WLC
tristate "weighted least-connection scheduling"
help
The weighted least-connection scheduling algorithm directs network
connections to the server with the least active connections
normalized by the server weight.
If you want to compile it in kernel, say Y. To compile it as a
module, choose M here. If unsure, say N.
config IP_VS_FO
tristate "weighted failover scheduling"
help
The weighted failover scheduling algorithm directs network
connections to the server with the highest weight that is
currently available.
If you want to compile it in kernel, say Y. To compile it as a
module, choose M here. If unsure, say N.
config IP_VS_OVF
tristate "weighted overflow scheduling"
help
The weighted overflow scheduling algorithm directs network
connections to the server with the highest weight that is
currently available and overflows to the next when active
connections exceed the node's weight.
If you want to compile it in kernel, say Y. To compile it as a
module, choose M here. If unsure, say N.
config IP_VS_LBLC
tristate "locality-based least-connection scheduling"
help
The locality-based least-connection scheduling algorithm is for
destination IP load balancing. It is usually used in cache cluster.
This algorithm usually directs packet destined for an IP address to
its server if the server is alive and under load. If the server is
overloaded (its active connection numbers is larger than its weight)
and there is a server in its half load, then allocate the weighted
least-connection server to this IP address.
If you want to compile it in kernel, say Y. To compile it as a
module, choose M here. If unsure, say N.
config IP_VS_LBLCR
tristate "locality-based least-connection with replication scheduling"
help
The locality-based least-connection with replication scheduling
algorithm is also for destination IP load balancing. It is
usually used in cache cluster. It differs from the LBLC scheduling
as follows: the load balancer maintains mappings from a target
to a set of server nodes that can serve the target. Requests for
a target are assigned to the least-connection node in the target's
server set. If all the node in the server set are over loaded,
it picks up a least-connection node in the cluster and adds it
in the sever set for the target. If the server set has not been
modified for the specified time, the most loaded node is removed
from the server set, in order to avoid high degree of replication.
If you want to compile it in kernel, say Y. To compile it as a
module, choose M here. If unsure, say N.
config IP_VS_DH
tristate "destination hashing scheduling"
help
The destination hashing scheduling algorithm assigns network
connections to the servers through looking up a statically assigned
hash table by their destination IP addresses.
If you want to compile it in kernel, say Y. To compile it as a
module, choose M here. If unsure, say N.
config IP_VS_SH
tristate "source hashing scheduling"
help
The source hashing scheduling algorithm assigns network
connections to the servers through looking up a statically assigned
hash table by their source IP addresses.
If you want to compile it in kernel, say Y. To compile it as a
module, choose M here. If unsure, say N.
config IP_VS_MH
tristate "maglev hashing scheduling"
help
The maglev consistent hashing scheduling algorithm provides the
Google's Maglev hashing algorithm as a IPVS scheduler. It assigns
network connections to the servers through looking up a statically
assigned special hash table called the lookup table. Maglev hashing
is to assign a preference list of all the lookup table positions
to each destination.
Through this operation, The maglev hashing gives an almost equal
share of the lookup table to each of the destinations and provides
minimal disruption by using the lookup table. When the set of
destinations changes, a connection will likely be sent to the same
destination as it was before.
If you want to compile it in kernel, say Y. To compile it as a
module, choose M here. If unsure, say N.
config IP_VS_SED
tristate "shortest expected delay scheduling"
help
The shortest expected delay scheduling algorithm assigns network
connections to the server with the shortest expected delay. The
expected delay that the job will experience is (Ci + 1) / Ui if
sent to the ith server, in which Ci is the number of connections
on the ith server and Ui is the fixed service rate (weight)
of the ith server.
If you want to compile it in kernel, say Y. To compile it as a
module, choose M here. If unsure, say N.
config IP_VS_NQ
tristate "never queue scheduling"
help
The never queue scheduling algorithm adopts a two-speed model.
When there is an idle server available, the job will be sent to
the idle server, instead of waiting for a fast one. When there
is no idle server available, the job will be sent to the server
that minimize its expected delay (The Shortest Expected Delay
scheduling algorithm).
If you want to compile it in kernel, say Y. To compile it as a
module, choose M here. If unsure, say N.
config IP_VS_TWOS
tristate "weighted random twos choice least-connection scheduling"
help
The weighted random twos choice least-connection scheduling
algorithm picks two random real servers and directs network
connections to the server with the least active connections
normalized by the server weight.
If you want to compile it in kernel, say Y. To compile it as a
module, choose M here. If unsure, say N.
comment 'IPVS SH scheduler'
config IP_VS_SH_TAB_BITS
int "IPVS source hashing table size (the Nth power of 2)"
range 4 20
default 8
help
The source hashing scheduler maps source IPs to destinations
stored in a hash table. This table is tiled by each destination
until all slots in the table are filled. When using weights to
allow destinations to receive more connections, the table is
tiled an amount proportional to the weights specified. The table
needs to be large enough to effectively fit all the destinations
multiplied by their respective weights.
comment 'IPVS MH scheduler'
config IP_VS_MH_TAB_INDEX
int "IPVS maglev hashing table index of size (the prime numbers)"
range 8 17
default 12
help
The maglev hashing scheduler maps source IPs to destinations
stored in a hash table. This table is assigned by a preference
list of the positions to each destination until all slots in
the table are filled. The index determines the prime for size of
the table as 251, 509, 1021, 2039, 4093, 8191, 16381, 32749,
65521 or 131071. When using weights to allow destinations to
receive more connections, the table is assigned an amount
proportional to the weights specified. The table needs to be large
enough to effectively fit all the destinations multiplied by their
respective weights.
comment 'IPVS application helper'
config IP_VS_FTP
tristate "FTP protocol helper"
depends on IP_VS_PROTO_TCP && NF_CONNTRACK && NF_NAT && \
NF_CONNTRACK_FTP
select IP_VS_NFCT
help
FTP is a protocol that transfers IP address and/or port number in
the payload. In the virtual server via Network Address Translation,
the IP address and port number of real servers cannot be sent to
clients in ftp connections directly, so FTP protocol helper is
required for tracking the connection and mangling it back to that of
virtual service.
If you want to compile it in kernel, say Y. To compile it as a
module, choose M here. If unsure, say N.
config IP_VS_NFCT
bool "Netfilter connection tracking"
depends on NF_CONNTRACK
help
The Netfilter connection tracking support allows the IPVS
connection state to be exported to the Netfilter framework
for filtering purposes.
config IP_VS_PE_SIP
tristate "SIP persistence engine"
depends on IP_VS_PROTO_UDP
depends on NF_CONNTRACK_SIP
help
Allow persistence based on the SIP Call-ID
endif # IP_VS
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