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sentinel: Decouple bind address from address sent to other sentinels

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There are instances such as EC2 where the bind address is private
(behind a NAT) and cannot be accessible from WAN.

https://groups.google.com/d/msg/redis-db/PVVvjO4nMd0/P3oWC036v3cJ
This commit is contained in:
Dara Kong 2014-07-29 10:49:56 -07:00 committed by antirez
parent 67e414c7b8
commit 3d939266be
2 changed files with 31 additions and 3 deletions
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7
sentinel.conf
View File

@ -4,6 +4,13 @@
# The port that this sentinel instance will run on
port 26379
# announce <ip>
# The IP that other sentinels use to connect to this sentinel instance
#
# Example:
#
# sentinel announce 1.2.3.4
# dir <working-directory>
# Every long running process should have a well-defined working directory.
# For Redis Sentinel to chdir to /tmp at startup is the simplest thing

27
src/sentinel.c
View File

@ -203,6 +203,7 @@ struct sentinelState {
mstime_t tilt_start_time; /* When TITL started. */
mstime_t previous_time; /* Last time we ran the time handler. */
list *scripts_queue; /* Queue of user scripts to execute. */
sentinelAddr *announce_addr; /* Address that is gossiped to other sentinels. */
} sentinel;
/* A script execution job. */
@ -425,6 +426,7 @@ void initSentinel(void) {
sentinel.previous_time = mstime();
sentinel.running_scripts = 0;
sentinel.scripts_queue = listCreate();
sentinel.announce_addr = NULL;
}
/* This function gets called when the server is in Sentinel mode, started,
@ -1425,6 +1427,12 @@ char *sentinelHandleConfiguration(char **argv, int argc) {
return "Wrong hostname or port for sentinel.";
}
if (argc == 5) si->runid = sdsnew(argv[4]);
} else if (!strcasecmp(argv[0],"announce") && argc == 2) {
/* announce <host> */
sentinel.announce_addr = createSentinelAddr(argv[1], server.port);
if (sentinel.announce_addr == NULL) {
return "Unable to resolve host.";
}
} else {
return "Unrecognized sentinel configuration statement.";
}
@ -2213,19 +2221,30 @@ int sentinelSendHello(sentinelRedisInstance *ri) {
char ip[REDIS_IP_STR_LEN];
char payload[REDIS_IP_STR_LEN+1024];
int retval;
char *announceIP;
int port;
sentinelRedisInstance *master = (ri->flags & SRI_MASTER) ? ri : ri->master;
sentinelAddr *master_addr = sentinelGetCurrentMasterAddress(master);
if (ri->flags & SRI_DISCONNECTED) return REDIS_ERR;
/* Try to obtain our own IP address. */
if (anetSockName(ri->cc->c.fd,ip,sizeof(ip),NULL) == -1) return REDIS_ERR;
/* Use the specified announce address if specified, otherwise try to
* obtain our own IP address. */
if (sentinel.announce_addr) {
announceIP = sentinel.announce_addr->ip;
port = sentinel.announce_addr->port;
} else {
if (anetSockName(ri->cc->c.fd,ip,sizeof(ip),NULL) == -1)
return REDIS_ERR;
announceIP = ip;
port = server.port;
}
/* Format and send the Hello message. */
snprintf(payload,sizeof(payload),
"%s,%d,%s,%llu," /* Info about this sentinel. */
"%s,%s,%d,%llu", /* Info about current master. */
ip, server.port, server.runid,
announceIP, port, server.runid,
(unsigned long long) sentinel.current_epoch,
/* --- */
master->name,master_addr->ip,master_addr->port,
@ -2234,6 +2253,8 @@ int sentinelSendHello(sentinelRedisInstance *ri) {
sentinelPublishReplyCallback, NULL, "PUBLISH %s %s",
SENTINEL_HELLO_CHANNEL,payload);
if (retval != REDIS_OK) return REDIS_ERR;
redisLog(REDIS_DEBUG, "Sentinel Send Hello ip=%s, port=%d, id=%s, epoch=%llu",
announceIP, port, server.runid, (unsigned long long) sentinel.current_epoch);
ri->pending_commands++;
return REDIS_OK;
}