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4 commits

Author SHA1 Message Date
Madhu Venugopal
2efdb8cbf5 Make discovery ttl and heartbeat configurable
Docker daemon uses kv-store as the host-discovery backend.
Discovery module tracks the liveness of a node through a simple
keepalive mechanism.  The keepalive mechanism depends on every
node performing heartbeat by registering itself with the discovery
module (via KV-Store Put operation). And for every Put operation,
the discovery module in all other nodes will receive a Watch
notification. That keeps the node alive.
Any node that fails to register itself within the TTL timer is
considered dead and removed from the discovery database.

The default timer (heartbeat = 20 seconds & ttl = 60 seconds)
works fine for small clusters.  But for large clusters, these
default timers are extremely aggressive and that causes high CPU
& most of the processing is spent managing the node discovery
and that impacts normal daemon operation.

Hence we need a way to make the discovery ttl and heartbeat
configurable.  As the cluster size grows, the user can change
these timers to make sure the daemon scales.

Signed-off-by: Madhu Venugopal <madhu@docker.com>
2015-11-25 06:51:55 -08:00
Alexander Morozov
d83b5dc177 Refactoring in daemon/discovery.go
Replace time.Sleep with time.Tick and remove unnecessary var block.
Use Warn log-level instead of error.

Signed-off-by: Alexander Morozov <lk4d4@docker.com>
2015-11-09 15:21:27 -08:00
Daniel Hiltgen
124792a871 Add TLS support for discovery backend
This leverages recent additions to libkv enabling client
authentication via TLS so the discovery back-end can be locked
down with mutual TLS.  Example usage:

    docker daemon [other args] \
        --cluster-advertise 192.168.122.168:2376 \
        --cluster-store etcd://192.168.122.168:2379 \
        --cluster-store-opt kv.cacertfile=/path/to/ca.pem \
        --cluster-store-opt kv.certfile=/path/to/cert.pem \
        --cluster-store-opt kv.keyfile=/path/to/key.pem

Signed-off-by: Daniel Hiltgen <daniel.hiltgen@docker.com>
2015-10-07 16:01:00 -07:00
Arnaud Porterie
7d193ef1f3 Add builtin nodes discovery
Use `pkg/discovery` to provide nodes discovery between daemon instances.

The functionality is driven by two different command-line flags: the
experimental `--cluster-store` (previously `--kv-store`) and
`--cluster-advertise`. It can be used in two ways by interested
components:

1. Externally by calling the `/info` API and examining the cluster store
   field. The `pkg/discovery` package can then be used to hit the same
   endpoint and watch for appearing or disappearing nodes. That is the
   method that will for example be used by Swarm.
2. Internally by using the `Daemon.discoveryWatcher` instance. That is
   the method that will for example be used by libnetwork.

Signed-off-by: Arnaud Porterie <arnaud.porterie@docker.com>
2015-09-25 14:52:09 -07:00