Add grpc keepalive configuration. (#19339) Prior to the introduction of this configuration, grpc keepalive messages were sent after 2 hours of inactivity on the stream. This posed issues in various scenarios where the server-side xds connection balancing was unaware that envoy instances were uncleanly killed / force-closed, since the connections would only be cleaned up after ~5 minutes of TCP timeouts occurred. Setting this config to a 30 second interval with a 20 second timeout ensures that at most, it should take up to 50 seconds for a dead xds connection to be closed.
This commit is contained in:
Derek Menteer
GitHub
parent
d547958f2c
commit
19f9de2224
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@ -0,0 +1,4 @@
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```release-note:bug
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connect: Fix bug where uncleanly closed xDS connections would influence connection balancing for too long and prevent envoy instances from starting. Two new configuration fields
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`performance.grpc_keepalive_timeout` and `performance.grpc_keepalive_interval` now exist to allow for configuration on how often these dead connections will be cleaned up.
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```
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@ -34,6 +34,7 @@ import (
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"golang.org/x/net/http2"
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"golang.org/x/net/http2/h2c"
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"google.golang.org/grpc"
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"google.golang.org/grpc/keepalive"
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"github.com/hashicorp/consul/acl"
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"github.com/hashicorp/consul/acl/resolver"
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@ -678,6 +679,10 @@ func (a *Agent) Start(ctx context.Context) error {
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metrics.Default(),
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a.tlsConfigurator,
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incomingRPCLimiter,
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keepalive.ServerParameters{
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Time: a.config.GRPCKeepaliveInterval,
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Timeout: a.config.GRPCKeepaliveTimeout,
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},
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)
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server, err := consul.NewServer(consulCfg, a.baseDeps.Deps, a.externalGRPCServer, incomingRPCLimiter, serverLogger)
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@ -709,6 +714,10 @@ func (a *Agent) Start(ctx context.Context) error {
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metrics.Default(),
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a.tlsConfigurator,
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rpcRate.NullRequestLimitsHandler(),
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keepalive.ServerParameters{
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Time: a.config.GRPCKeepaliveInterval,
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Timeout: a.config.GRPCKeepaliveTimeout,
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},
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)
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client, err := consul.NewClient(consulCfg, a.baseDeps.Deps)
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@ -1018,6 +1018,8 @@ func (b *builder) build() (rt RuntimeConfig, err error) {
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GRPCPort: grpcPort,
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GRPCTLSAddrs: grpcTlsAddrs,
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GRPCTLSPort: grpcTlsPort,
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GRPCKeepaliveInterval: b.durationValWithDefaultMin("performance.grpc_keepalive_interval", c.Performance.GRPCKeepaliveInterval, 30*time.Second, time.Second),
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GRPCKeepaliveTimeout: b.durationValWithDefaultMin("performance.grpc_keepalive_timeout", c.Performance.GRPCKeepaliveTimeout, 20*time.Second, time.Second),
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HTTPMaxConnsPerClient: intVal(c.Limits.HTTPMaxConnsPerClient),
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HTTPSHandshakeTimeout: b.durationVal("limits.https_handshake_timeout", c.Limits.HTTPSHandshakeTimeout),
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KVMaxValueSize: uint64Val(c.Limits.KVMaxValueSize),
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@ -673,9 +673,11 @@ type HTTPConfig struct {
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}
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type Performance struct {
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LeaveDrainTime *string `mapstructure:"leave_drain_time"`
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RaftMultiplier *int `mapstructure:"raft_multiplier"` // todo(fs): validate as uint
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RPCHoldTimeout *string `mapstructure:"rpc_hold_timeout"`
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LeaveDrainTime *string `mapstructure:"leave_drain_time"`
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RaftMultiplier *int `mapstructure:"raft_multiplier"` // todo(fs): validate as uint
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RPCHoldTimeout *string `mapstructure:"rpc_hold_timeout"`
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GRPCKeepaliveInterval *string `mapstructure:"grpc_keepalive_interval"`
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GRPCKeepaliveTimeout *string `mapstructure:"grpc_keepalive_timeout"`
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}
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type Telemetry struct {
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@ -118,6 +118,8 @@ func DefaultSource() Source {
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leave_drain_time = "5s"
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raft_multiplier = ` + strconv.Itoa(int(consul.DefaultRaftMultiplier)) + `
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rpc_hold_timeout = "7s"
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grpc_keepalive_interval = "30s"
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grpc_keepalive_timeout = "20s"
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}
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ports = {
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dns = 8600
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@ -717,6 +717,19 @@ type RuntimeConfig struct {
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// hcl: client_addr = string addresses { grpc_tls = string } ports { grpc_tls = int }
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GRPCTLSAddrs []net.Addr
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// GRPCKeepaliveInterval determines how frequently an HTTP2 keepalive will be broadcast
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// whenever a GRPC connection is idle. This helps detect xds connections that have died.
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//
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// Since the xds load balancing between servers relies on knowing how many connections
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// are active, this configuration ensures that they are routinely detected / cleaned up
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// on an interval.
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GRPCKeepaliveInterval time.Duration
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// GRPCKeepaliveTimeout specifies how long a GRPC client has to reply to the keepalive
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// messages spawned from GRPCKeepaliveInterval. If a client does not reply in this amount of
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// time, the connection will be closed by the server.
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GRPCKeepaliveTimeout time.Duration
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// HTTPAddrs contains the list of TCP addresses and UNIX sockets the HTTP
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// server will bind to. If the HTTP endpoint is disabled (ports.http <= 0)
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// the list is empty.
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@ -6430,6 +6430,8 @@ func TestLoad_FullConfig(t *testing.T) {
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GRPCAddrs: []net.Addr{tcpAddr("32.31.61.91:4881")},
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GRPCTLSPort: 5201,
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GRPCTLSAddrs: []net.Addr{tcpAddr("23.14.88.19:5201")},
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GRPCKeepaliveInterval: 33 * time.Second,
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GRPCKeepaliveTimeout: 22 * time.Second,
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HTTPAddrs: []net.Addr{tcpAddr("83.39.91.39:7999")},
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HTTPBlockEndpoints: []string{"RBvAFcGD", "fWOWFznh"},
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AllowWriteHTTPFrom: []*net.IPNet{cidr("127.0.0.0/8"), cidr("22.33.44.55/32"), cidr("0.0.0.0/0")},
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@ -209,6 +209,8 @@
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"GRPCPort": 0,
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"GRPCTLSAddrs": [],
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"GRPCTLSPort": 0,
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"GRPCKeepaliveInterval": "0s",
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"GRPCKeepaliveTimeout": "0s",
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"GossipLANGossipInterval": "0s",
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"GossipLANGossipNodes": 0,
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"GossipLANProbeInterval": "0s",
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@ -335,6 +335,8 @@ performance {
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leave_drain_time = "8265s"
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raft_multiplier = 5
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rpc_hold_timeout = "15707s"
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grpc_keepalive_interval = "33s"
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grpc_keepalive_timeout = "22s"
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}
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pid_file = "43xN80Km"
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ports {
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@ -383,7 +383,9 @@
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"performance": {
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"leave_drain_time": "8265s",
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"raft_multiplier": 5,
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"rpc_hold_timeout": "15707s"
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"rpc_hold_timeout": "15707s",
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"grpc_keepalive_interval": "33s",
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"grpc_keepalive_timeout": "22s"
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},
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"pid_file": "43xN80Km",
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"ports": {
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@ -26,6 +26,7 @@ import (
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"github.com/stretchr/testify/require"
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"golang.org/x/time/rate"
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"google.golang.org/grpc"
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"google.golang.org/grpc/keepalive"
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"github.com/hashicorp/consul-net-rpc/net/rpc"
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@ -335,7 +336,7 @@ func newServerWithDeps(t *testing.T, c *Config, deps Deps) (*Server, error) {
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oldNotify()
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}
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}
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grpcServer := external.NewServer(deps.Logger.Named("grpc.external"), nil, deps.TLSConfigurator, rpcRate.NullRequestLimitsHandler())
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grpcServer := external.NewServer(deps.Logger.Named("grpc.external"), nil, deps.TLSConfigurator, rpcRate.NullRequestLimitsHandler(), keepalive.ServerParameters{})
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srv, err := NewServer(c, deps, grpcServer, nil, deps.Logger)
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if err != nil {
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return nil, err
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@ -27,7 +27,13 @@ var (
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// NewServer constructs a gRPC server for the external gRPC port, to which
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// handlers can be registered.
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func NewServer(logger agentmiddleware.Logger, metricsObj *metrics.Metrics, tls *tlsutil.Configurator, limiter rate.RequestLimitsHandler) *grpc.Server {
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func NewServer(
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logger agentmiddleware.Logger,
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metricsObj *metrics.Metrics,
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tls *tlsutil.Configurator,
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limiter rate.RequestLimitsHandler,
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keepaliveParams keepalive.ServerParameters,
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) *grpc.Server {
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if metricsObj == nil {
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metricsObj = metrics.Default()
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}
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@ -56,6 +62,7 @@ func NewServer(logger agentmiddleware.Logger, metricsObj *metrics.Metrics, tls *
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grpc.StatsHandler(agentmiddleware.NewStatsHandler(metricsObj, metricsLabels)),
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middleware.WithUnaryServerChain(unaryInterceptors...),
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middleware.WithStreamServerChain(streamInterceptors...),
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grpc.KeepaliveParams(keepaliveParams),
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grpc.KeepaliveEnforcementPolicy(keepalive.EnforcementPolicy{
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// This must be less than the keealive.ClientParameters Time setting, otherwise
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// the server will disconnect the client for sending too many keepalive pings.
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@ -14,6 +14,7 @@ import (
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"github.com/stretchr/testify/require"
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"golang.org/x/sync/errgroup"
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"google.golang.org/grpc"
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"google.golang.org/grpc/keepalive"
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"github.com/hashicorp/go-hclog"
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@ -27,7 +28,7 @@ import (
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func TestServer_EmitsStats(t *testing.T) {
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sink, metricsObj := testutil.NewFakeSink(t)
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srv := NewServer(hclog.Default(), metricsObj, nil, rate.NullRequestLimitsHandler())
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srv := NewServer(hclog.Default(), metricsObj, nil, rate.NullRequestLimitsHandler(), keepalive.ServerParameters{})
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testservice.RegisterSimpleServer(srv, &testservice.Simple{})
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@ -21,6 +21,7 @@ import (
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"github.com/stretchr/testify/require"
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gogrpc "google.golang.org/grpc"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/keepalive"
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"google.golang.org/grpc/metadata"
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grpcstatus "google.golang.org/grpc/status"
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"google.golang.org/protobuf/proto"
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@ -1816,7 +1817,7 @@ func newTestServer(t *testing.T, cb func(conf *consul.Config)) testingServer {
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conf.ACLResolverSettings.EnterpriseMeta = *conf.AgentEnterpriseMeta()
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deps := newDefaultDeps(t, conf)
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externalGRPCServer := external.NewServer(deps.Logger, nil, deps.TLSConfigurator, rate.NullRequestLimitsHandler())
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externalGRPCServer := external.NewServer(deps.Logger, nil, deps.TLSConfigurator, rate.NullRequestLimitsHandler(), keepalive.ServerParameters{})
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server, err := consul.NewServer(conf, deps, externalGRPCServer, nil, deps.Logger)
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require.NoError(t, err)
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@ -607,6 +607,10 @@ Refer to the [formatting specification](https://golang.org/pkg/time/#ParseDurati
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This was added in Consul 1.0. Must be a duration value such as 10s. Defaults
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to 7s.
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- `grpc_keepalive_interval` - A duration that determines the frequency that Consul servers send keep-alive messages to inactive gRPC clients. Configure this setting to modify how quickly Consul detects and removes improperly closed xDS or peering connections. Default is `30s`.
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- `grpc_keepalive_timeout` - A duration that determines how long a Consul server waits for a reply to a keep-alive message. If the server does not receive a reply before the end of the duration, Consul flags the gRPC connection as unhealthy and forcibly removes it. Defaults to `20s`.
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- `pid_file` Equivalent to the [`-pid-file` command line flag](/consul/docs/agent/config/cli-flags#_pid_file).
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- `ports` This is a nested object that allows setting the bind ports for the following keys:
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