124792a871
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>
48 lines
1.7 KiB
Go
48 lines
1.7 KiB
Go
package daemon
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import (
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"time"
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log "github.com/Sirupsen/logrus"
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"github.com/docker/docker/pkg/discovery"
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// Register the libkv backends for discovery.
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_ "github.com/docker/docker/pkg/discovery/kv"
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)
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const (
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// defaultDiscoveryHeartbeat is the default value for discovery heartbeat interval.
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defaultDiscoveryHeartbeat = 20 * time.Second
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// defaultDiscoveryTTL is the default TTL interface for discovery.
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defaultDiscoveryTTL = 60 * time.Second
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)
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// initDiscovery initialized the nodes discovery subsystem by connecting to the specified backend
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// and start a registration loop to advertise the current node under the specified address.
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func initDiscovery(backend, address string, clusterOpts map[string]string) (discovery.Backend, error) {
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var (
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discoveryBackend discovery.Backend
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err error
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)
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if discoveryBackend, err = discovery.New(backend, defaultDiscoveryHeartbeat, defaultDiscoveryTTL, clusterOpts); err != nil {
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return nil, err
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}
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// We call Register() on the discovery backend in a loop for the whole lifetime of the daemon,
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// but we never actually Watch() for nodes appearing and disappearing for the moment.
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go registrationLoop(discoveryBackend, address)
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return discoveryBackend, nil
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}
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// registrationLoop registers the current node against the discovery backend using the specified
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// address. The function never returns, as registration against the backend comes with a TTL and
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// requires regular heartbeats.
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func registrationLoop(discoveryBackend discovery.Backend, address string) {
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for {
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if err := discoveryBackend.Register(address); err != nil {
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log.Errorf("Registering as %q in discovery failed: %v", address, err)
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}
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time.Sleep(defaultDiscoveryHeartbeat)
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}
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}
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