1# SPDX-License-Identifier: GPL-2.0-only 2# 3# IP Virtual Server configuration 4# 5menuconfig IP_VS 6 tristate "IP virtual server support" 7 depends on INET && NETFILTER 8 depends on (NF_CONNTRACK || NF_CONNTRACK=n) 9 help 10 IP Virtual Server support will let you build a high-performance 11 virtual server based on cluster of two or more real servers. This 12 option must be enabled for at least one of the clustered computers 13 that will take care of intercepting incoming connections to a 14 single IP address and scheduling them to real servers. 15 16 Three request dispatching techniques are implemented, they are 17 virtual server via NAT, virtual server via tunneling and virtual 18 server via direct routing. The several scheduling algorithms can 19 be used to choose which server the connection is directed to, 20 thus load balancing can be achieved among the servers. For more 21 information and its administration program, please visit the 22 following URL: <http://www.linuxvirtualserver.org/>. 23 24 If you want to compile it in kernel, say Y. To compile it as a 25 module, choose M here. If unsure, say N. 26 27if IP_VS 28 29config IP_VS_IPV6 30 bool "IPv6 support for IPVS" 31 depends on IPV6 = y || IP_VS = IPV6 32 select NF_DEFRAG_IPV6 33 help 34 Add IPv6 support to IPVS. 35 36 Say Y if unsure. 37 38config IP_VS_DEBUG 39 bool "IP virtual server debugging" 40 help 41 Say Y here if you want to get additional messages useful in 42 debugging the IP virtual server code. You can change the debug 43 level in /proc/sys/net/ipv4/vs/debug_level 44 45config IP_VS_TAB_BITS 46 int "IPVS connection table size (the Nth power of 2)" 47 range 8 20 if !64BIT 48 range 8 27 if 64BIT 49 default 12 50 help 51 The IPVS connection hash table uses the chaining scheme to handle 52 hash collisions. Using a big IPVS connection hash table will greatly 53 reduce conflicts when there are hundreds of thousands of connections 54 in the hash table. 55 56 Note the table size must be power of 2. The table size will be the 57 value of 2 to the your input number power. The number to choose is 58 from 8 to 27 for 64BIT(20 otherwise), the default number is 12, 59 which means the table size is 4096. Don't input the number too 60 small, otherwise you will lose performance on it. You can adapt the 61 table size yourself, according to your virtual server application. 62 It is good to set the table size not far less than the number of 63 connections per second multiplying average lasting time of 64 connection in the table. For example, your virtual server gets 200 65 connections per second, the connection lasts for 200 seconds in 66 average in the connection table, the table size should be not far 67 less than 200x200, it is good to set the table size 32768 (2**15). 68 69 Another note that each connection occupies 128 bytes effectively and 70 each hash entry uses 8 bytes, so you can estimate how much memory is 71 needed for your box. 72 73 You can overwrite this number setting conn_tab_bits module parameter 74 or by appending ip_vs.conn_tab_bits=? to the kernel command line if 75 IP VS was compiled built-in. 76 77comment "IPVS transport protocol load balancing support" 78 79config IP_VS_PROTO_TCP 80 bool "TCP load balancing support" 81 help 82 This option enables support for load balancing TCP transport 83 protocol. Say Y if unsure. 84 85config IP_VS_PROTO_UDP 86 bool "UDP load balancing support" 87 help 88 This option enables support for load balancing UDP transport 89 protocol. Say Y if unsure. 90 91config IP_VS_PROTO_AH_ESP 92 def_bool IP_VS_PROTO_ESP || IP_VS_PROTO_AH 93 94config IP_VS_PROTO_ESP 95 bool "ESP load balancing support" 96 help 97 This option enables support for load balancing ESP (Encapsulation 98 Security Payload) transport protocol. Say Y if unsure. 99 100config IP_VS_PROTO_AH 101 bool "AH load balancing support" 102 help 103 This option enables support for load balancing AH (Authentication 104 Header) transport protocol. Say Y if unsure. 105 106config IP_VS_PROTO_SCTP 107 bool "SCTP load balancing support" 108 select LIBCRC32C 109 help 110 This option enables support for load balancing SCTP transport 111 protocol. Say Y if unsure. 112 113comment "IPVS scheduler" 114 115config IP_VS_RR 116 tristate "round-robin scheduling" 117 help 118 The robin-robin scheduling algorithm simply directs network 119 connections to different real servers in a round-robin manner. 120 121 If you want to compile it in kernel, say Y. To compile it as a 122 module, choose M here. If unsure, say N. 123 124config IP_VS_WRR 125 tristate "weighted round-robin scheduling" 126 help 127 The weighted robin-robin scheduling algorithm directs network 128 connections to different real servers based on server weights 129 in a round-robin manner. Servers with higher weights receive 130 new connections first than those with less weights, and servers 131 with higher weights get more connections than those with less 132 weights and servers with equal weights get equal connections. 133 134 If you want to compile it in kernel, say Y. To compile it as a 135 module, choose M here. If unsure, say N. 136 137config IP_VS_LC 138 tristate "least-connection scheduling" 139 help 140 The least-connection scheduling algorithm directs network 141 connections to the server with the least number of active 142 connections. 143 144 If you want to compile it in kernel, say Y. To compile it as a 145 module, choose M here. If unsure, say N. 146 147config IP_VS_WLC 148 tristate "weighted least-connection scheduling" 149 help 150 The weighted least-connection scheduling algorithm directs network 151 connections to the server with the least active connections 152 normalized by the server weight. 153 154 If you want to compile it in kernel, say Y. To compile it as a 155 module, choose M here. If unsure, say N. 156 157config IP_VS_FO 158 tristate "weighted failover scheduling" 159 help 160 The weighted failover scheduling algorithm directs network 161 connections to the server with the highest weight that is 162 currently available. 163 164 If you want to compile it in kernel, say Y. To compile it as a 165 module, choose M here. If unsure, say N. 166 167config IP_VS_OVF 168 tristate "weighted overflow scheduling" 169 help 170 The weighted overflow scheduling algorithm directs network 171 connections to the server with the highest weight that is 172 currently available and overflows to the next when active 173 connections exceed the node's weight. 174 175 If you want to compile it in kernel, say Y. To compile it as a 176 module, choose M here. If unsure, say N. 177 178config IP_VS_LBLC 179 tristate "locality-based least-connection scheduling" 180 help 181 The locality-based least-connection scheduling algorithm is for 182 destination IP load balancing. It is usually used in cache cluster. 183 This algorithm usually directs packet destined for an IP address to 184 its server if the server is alive and under load. If the server is 185 overloaded (its active connection numbers is larger than its weight) 186 and there is a server in its half load, then allocate the weighted 187 least-connection server to this IP address. 188 189 If you want to compile it in kernel, say Y. To compile it as a 190 module, choose M here. If unsure, say N. 191 192config IP_VS_LBLCR 193 tristate "locality-based least-connection with replication scheduling" 194 help 195 The locality-based least-connection with replication scheduling 196 algorithm is also for destination IP load balancing. It is 197 usually used in cache cluster. It differs from the LBLC scheduling 198 as follows: the load balancer maintains mappings from a target 199 to a set of server nodes that can serve the target. Requests for 200 a target are assigned to the least-connection node in the target's 201 server set. If all the node in the server set are over loaded, 202 it picks up a least-connection node in the cluster and adds it 203 in the sever set for the target. If the server set has not been 204 modified for the specified time, the most loaded node is removed 205 from the server set, in order to avoid high degree of replication. 206 207 If you want to compile it in kernel, say Y. To compile it as a 208 module, choose M here. If unsure, say N. 209 210config IP_VS_DH 211 tristate "destination hashing scheduling" 212 help 213 The destination hashing scheduling algorithm assigns network 214 connections to the servers through looking up a statically assigned 215 hash table by their destination IP addresses. 216 217 If you want to compile it in kernel, say Y. To compile it as a 218 module, choose M here. If unsure, say N. 219 220config IP_VS_SH 221 tristate "source hashing scheduling" 222 help 223 The source hashing scheduling algorithm assigns network 224 connections to the servers through looking up a statically assigned 225 hash table by their source IP addresses. 226 227 If you want to compile it in kernel, say Y. To compile it as a 228 module, choose M here. If unsure, say N. 229 230config IP_VS_MH 231 tristate "maglev hashing scheduling" 232 help 233 The maglev consistent hashing scheduling algorithm provides the 234 Google's Maglev hashing algorithm as a IPVS scheduler. It assigns 235 network connections to the servers through looking up a statically 236 assigned special hash table called the lookup table. Maglev hashing 237 is to assign a preference list of all the lookup table positions 238 to each destination. 239 240 Through this operation, The maglev hashing gives an almost equal 241 share of the lookup table to each of the destinations and provides 242 minimal disruption by using the lookup table. When the set of 243 destinations changes, a connection will likely be sent to the same 244 destination as it was before. 245 246 If you want to compile it in kernel, say Y. To compile it as a 247 module, choose M here. If unsure, say N. 248 249config IP_VS_SED 250 tristate "shortest expected delay scheduling" 251 help 252 The shortest expected delay scheduling algorithm assigns network 253 connections to the server with the shortest expected delay. The 254 expected delay that the job will experience is (Ci + 1) / Ui if 255 sent to the ith server, in which Ci is the number of connections 256 on the ith server and Ui is the fixed service rate (weight) 257 of the ith server. 258 259 If you want to compile it in kernel, say Y. To compile it as a 260 module, choose M here. If unsure, say N. 261 262config IP_VS_NQ 263 tristate "never queue scheduling" 264 help 265 The never queue scheduling algorithm adopts a two-speed model. 266 When there is an idle server available, the job will be sent to 267 the idle server, instead of waiting for a fast one. When there 268 is no idle server available, the job will be sent to the server 269 that minimize its expected delay (The Shortest Expected Delay 270 scheduling algorithm). 271 272 If you want to compile it in kernel, say Y. To compile it as a 273 module, choose M here. If unsure, say N. 274 275config IP_VS_TWOS 276 tristate "weighted random twos choice least-connection scheduling" 277 help 278 The weighted random twos choice least-connection scheduling 279 algorithm picks two random real servers and directs network 280 connections to the server with the least active connections 281 normalized by the server weight. 282 283 If you want to compile it in kernel, say Y. To compile it as a 284 module, choose M here. If unsure, say N. 285 286comment 'IPVS SH scheduler' 287 288config IP_VS_SH_TAB_BITS 289 int "IPVS source hashing table size (the Nth power of 2)" 290 range 4 20 291 default 8 292 help 293 The source hashing scheduler maps source IPs to destinations 294 stored in a hash table. This table is tiled by each destination 295 until all slots in the table are filled. When using weights to 296 allow destinations to receive more connections, the table is 297 tiled an amount proportional to the weights specified. The table 298 needs to be large enough to effectively fit all the destinations 299 multiplied by their respective weights. 300 301comment 'IPVS MH scheduler' 302 303config IP_VS_MH_TAB_INDEX 304 int "IPVS maglev hashing table index of size (the prime numbers)" 305 range 8 17 306 default 12 307 help 308 The maglev hashing scheduler maps source IPs to destinations 309 stored in a hash table. This table is assigned by a preference 310 list of the positions to each destination until all slots in 311 the table are filled. The index determines the prime for size of 312 the table as��251, 509, 1021, 2039, 4093, 8191, 16381, 32749, 313 65521 or 131071.��When using weights to allow destinations to 314 receive more connections,��the table is assigned an amount 315 proportional to the weights specified.��The table needs to be large 316 enough to effectively fit all the destinations multiplied by their 317 respective weights. 318 319comment 'IPVS application helper' 320 321config IP_VS_FTP 322 tristate "FTP protocol helper" 323 depends on IP_VS_PROTO_TCP && NF_CONNTRACK && NF_NAT && \ 324 NF_CONNTRACK_FTP 325 select IP_VS_NFCT 326 help 327 FTP is a protocol that transfers IP address and/or port number in 328 the payload. In the virtual server via Network Address Translation, 329 the IP address and port number of real servers cannot be sent to 330 clients in ftp connections directly, so FTP protocol helper is 331 required for tracking the connection and mangling it back to that of 332 virtual service. 333 334 If you want to compile it in kernel, say Y. To compile it as a 335 module, choose M here. If unsure, say N. 336 337config IP_VS_NFCT 338 bool "Netfilter connection tracking" 339 depends on NF_CONNTRACK 340 help 341 The Netfilter connection tracking support allows the IPVS 342 connection state to be exported to the Netfilter framework 343 for filtering purposes. 344 345config IP_VS_PE_SIP 346 tristate "SIP persistence engine" 347 depends on IP_VS_PROTO_UDP 348 depends on NF_CONNTRACK_SIP 349 help 350 Allow persistence based on the SIP Call-ID 351 352endif # IP_VS 353