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Cluster: myself->ip autodiscovery.

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Instead of having an hardcoded IP address in the node configuration, we
autodiscover it via MEET messages for automatic update when the node is
restarted with a different IP address.

This mechanism was discussed in the context of PR #1782.
This commit is contained in:
antirez 2014-06-25 11:28:57 +02:00
parent 46319094db
commit f29b12d0bf
1 changed files with 25 additions and 0 deletions
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25
src/cluster.c
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@ -466,6 +466,11 @@ void clusterInit(void) {
/* The slots -> keys map is a sorted set. Init it. */
server.cluster->slots_to_keys = zslCreate();
/* Set myself->port to my listening port, we'll just need to discover
* the IP address via MEET messages. */
myself->port = server.port;
resetManualFailover();
}
@ -1531,6 +1536,26 @@ int clusterProcessPacket(clusterLink *link) {
if (type == CLUSTERMSG_TYPE_PING || type == CLUSTERMSG_TYPE_MEET) {
redisLog(REDIS_DEBUG,"Ping packet received: %p", (void*)link->node);
/* We use incoming MEET messages in order to set the address
* for 'myself', since only other cluster nodes will send us
* MEET messagses on handshakes, when the cluster joins, or
* later if we changed address, and those nodes will use our
* official address to connect to us. So by obtaining this address
* from the socket is a simple way to discover / update our own
* address in the cluster without it being hardcoded in the config. */
if (type == CLUSTERMSG_TYPE_MEET) {
char ip[REDIS_IP_STR_LEN];
if (anetSockName(link->fd,ip,sizeof(ip),NULL) != -1 &&
strcmp(ip,myself->ip))
{
memcpy(myself->ip,ip,REDIS_IP_STR_LEN);
redisLog(REDIS_WARNING,"IP address for this node updated to %s",
myself->ip);
clusterDoBeforeSleep(CLUSTER_TODO_SAVE_CONFIG);
}
}
/* Add this node if it is new for us and the msg type is MEET.
* In this stage we don't try to add the node with the right
* flags, slaveof pointer, and so forth, as this details will be