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Ability of slave to announce arbitrary ip/port to master.

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This feature is useful, especially in deployments using Sentinel in
order to setup Redis HA, where the slave is executed with NAT or port
forwarding, so that the auto-detected port/ip addresses, as listed in
the "INFO replication" output of the master, or as provided by the
"ROLE" command, don't match the real addresses at which the slave is
reachable for connections.
This commit is contained in:
antirez
2016-07-27 16:41:20 +02:00
parent 356a6304ec
commit 55385f99de
6 changed files with 129 additions and 17 deletions
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62
src/replication.c
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@ -47,7 +47,7 @@ int cancelReplicationHandshake(void);
/* Return the pointer to a string representing the slave ip:listening_port
* pair. Mostly useful for logging, since we want to log a slave using its
* IP address and it's listening port which is more clear for the user, for
* IP address and its listening port which is more clear for the user, for
* example: "Closing connection with slave 10.1.2.3:6380". */
char *replicationGetSlaveName(client *c) {
static char buf[NET_PEER_ID_LEN];
@ -55,7 +55,12 @@ char *replicationGetSlaveName(client *c) {
ip[0] = '\0';
buf[0] = '\0';
if (anetPeerToString(c->fd,ip,sizeof(ip),NULL) != -1) {
if (c->slave_ip[0] != '\0' ||
anetPeerToString(c->fd,ip,sizeof(ip),NULL) != -1)
{
/* Note that the 'ip' buffer is always larger than 'c->slave_ip' */
if (c->slave_ip[0] != '\0') memcpy(ip,c->slave_ip,sizeof(c->slave_ip));
if (c->slave_listening_port)
anetFormatAddr(buf,sizeof(buf),ip,c->slave_listening_port);
else
@ -717,6 +722,15 @@ void replconfCommand(client *c) {
&port,NULL) != C_OK))
return;
c->slave_listening_port = port;
} else if (!strcasecmp(c->argv[j]->ptr,"ip-address")) {
sds ip = c->argv[j+1]->ptr;
if (sdslen(ip) < sizeof(c->slave_ip)) {
memcpy(c->slave_ip,ip,sdslen(ip)+1);
} else {
addReplyErrorFormat(c,"REPLCONF ip-address provided by "
"slave instance is too long: %zd bytes", sdslen(ip));
return;
}
} else if (!strcasecmp(c->argv[j]->ptr,"capa")) {
/* Ignore capabilities not understood by this master. */
if (!strcasecmp(c->argv[j+1]->ptr,"eof"))
@ -1462,7 +1476,8 @@ void syncWithMaster(aeEventLoop *el, int fd, void *privdata, int mask) {
/* Set the slave port, so that Master's INFO command can list the
* slave listening port correctly. */
if (server.repl_state == REPL_STATE_SEND_PORT) {
sds port = sdsfromlonglong(server.port);
sds port = sdsfromlonglong(server.slave_announce_port ?
server.slave_announce_port : server.port);
err = sendSynchronousCommand(SYNC_CMD_WRITE,fd,"REPLCONF",
"listening-port",port, NULL);
sdsfree(port);
@ -1482,6 +1497,37 @@ void syncWithMaster(aeEventLoop *el, int fd, void *privdata, int mask) {
"REPLCONF listening-port: %s", err);
}
sdsfree(err);
server.repl_state = REPL_STATE_SEND_IP;
}
/* Skip REPLCONF ip-address if there is no slave-announce-ip option set. */
if (server.repl_state == REPL_STATE_SEND_IP &&
server.slave_announce_ip == NULL)
{
server.repl_state = REPL_STATE_SEND_CAPA;
}
/* Set the slave ip, so that Master's INFO command can list the
* slave IP address port correctly in case of port forwarding or NAT. */
if (server.repl_state == REPL_STATE_SEND_IP) {
err = sendSynchronousCommand(SYNC_CMD_WRITE,fd,"REPLCONF",
"ip-address",server.slave_announce_ip, NULL);
if (err) goto write_error;
sdsfree(err);
server.repl_state = REPL_STATE_RECEIVE_IP;
return;
}
/* Receive REPLCONF ip-address reply. */
if (server.repl_state == REPL_STATE_RECEIVE_IP) {
err = sendSynchronousCommand(SYNC_CMD_READ,fd,NULL);
/* Ignore the error if any, not all the Redis versions support
* REPLCONF listening-port. */
if (err[0] == '-') {
serverLog(LL_NOTICE,"(Non critical) Master does not understand "
"REPLCONF ip-address: %s", err);
}
sdsfree(err);
server.repl_state = REPL_STATE_SEND_CAPA;
}
@ -1787,12 +1833,16 @@ void roleCommand(client *c) {
listRewind(server.slaves,&li);
while((ln = listNext(&li))) {
client *slave = ln->value;
char ip[NET_IP_STR_LEN];
char ip[NET_IP_STR_LEN], *slaveip = slave->slave_ip;
if (anetPeerToString(slave->fd,ip,sizeof(ip),NULL) == -1) continue;
if (slaveip[0] == '\0') {
if (anetPeerToString(slave->fd,ip,sizeof(ip),NULL) == -1)
continue;
slaveip = ip;
}
if (slave->replstate != SLAVE_STATE_ONLINE) continue;
addReplyMultiBulkLen(c,3);
addReplyBulkCString(c,ip);
addReplyBulkCString(c,slaveip);
addReplyBulkLongLong(c,slave->slave_listening_port);
addReplyBulkLongLong(c,slave->repl_ack_off);
slaves++;