Backport of Add grpc keepalive configuration into release/1.16.x (#19339) (#19346)

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 2023-10-24 08:52:05 -05:00 committed by GitHub
parent d547958f2c
commit 19f9de2224
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15 changed files with 62 additions and 8 deletions

4
.changelog/19339.txt Normal file
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@ -0,0 +1,4 @@
```release-note:bug
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
`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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@ -34,6 +34,7 @@ import (
"golang.org/x/net/http2"
"golang.org/x/net/http2/h2c"
"google.golang.org/grpc"
"google.golang.org/grpc/keepalive"
"github.com/hashicorp/consul/acl"
"github.com/hashicorp/consul/acl/resolver"
@ -678,6 +679,10 @@ func (a *Agent) Start(ctx context.Context) error {
metrics.Default(),
a.tlsConfigurator,
incomingRPCLimiter,
keepalive.ServerParameters{
Time: a.config.GRPCKeepaliveInterval,
Timeout: a.config.GRPCKeepaliveTimeout,
},
)
server, err := consul.NewServer(consulCfg, a.baseDeps.Deps, a.externalGRPCServer, incomingRPCLimiter, serverLogger)
@ -709,6 +714,10 @@ func (a *Agent) Start(ctx context.Context) error {
metrics.Default(),
a.tlsConfigurator,
rpcRate.NullRequestLimitsHandler(),
keepalive.ServerParameters{
Time: a.config.GRPCKeepaliveInterval,
Timeout: a.config.GRPCKeepaliveTimeout,
},
)
client, err := consul.NewClient(consulCfg, a.baseDeps.Deps)

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@ -1018,6 +1018,8 @@ func (b *builder) build() (rt RuntimeConfig, err error) {
GRPCPort: grpcPort,
GRPCTLSAddrs: grpcTlsAddrs,
GRPCTLSPort: grpcTlsPort,
GRPCKeepaliveInterval: b.durationValWithDefaultMin("performance.grpc_keepalive_interval", c.Performance.GRPCKeepaliveInterval, 30*time.Second, time.Second),
GRPCKeepaliveTimeout: b.durationValWithDefaultMin("performance.grpc_keepalive_timeout", c.Performance.GRPCKeepaliveTimeout, 20*time.Second, time.Second),
HTTPMaxConnsPerClient: intVal(c.Limits.HTTPMaxConnsPerClient),
HTTPSHandshakeTimeout: b.durationVal("limits.https_handshake_timeout", c.Limits.HTTPSHandshakeTimeout),
KVMaxValueSize: uint64Val(c.Limits.KVMaxValueSize),

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@ -676,6 +676,8 @@ type Performance struct {
LeaveDrainTime *string `mapstructure:"leave_drain_time"`
RaftMultiplier *int `mapstructure:"raft_multiplier"` // todo(fs): validate as uint
RPCHoldTimeout *string `mapstructure:"rpc_hold_timeout"`
GRPCKeepaliveInterval *string `mapstructure:"grpc_keepalive_interval"`
GRPCKeepaliveTimeout *string `mapstructure:"grpc_keepalive_timeout"`
}
type Telemetry struct {

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@ -118,6 +118,8 @@ func DefaultSource() Source {
leave_drain_time = "5s"
raft_multiplier = ` + strconv.Itoa(int(consul.DefaultRaftMultiplier)) + `
rpc_hold_timeout = "7s"
grpc_keepalive_interval = "30s"
grpc_keepalive_timeout = "20s"
}
ports = {
dns = 8600

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@ -717,6 +717,19 @@ type RuntimeConfig struct {
// hcl: client_addr = string addresses { grpc_tls = string } ports { grpc_tls = int }
GRPCTLSAddrs []net.Addr
// GRPCKeepaliveInterval determines how frequently an HTTP2 keepalive will be broadcast
// whenever a GRPC connection is idle. This helps detect xds connections that have died.
//
// Since the xds load balancing between servers relies on knowing how many connections
// are active, this configuration ensures that they are routinely detected / cleaned up
// on an interval.
GRPCKeepaliveInterval time.Duration
// GRPCKeepaliveTimeout specifies how long a GRPC client has to reply to the keepalive
// messages spawned from GRPCKeepaliveInterval. If a client does not reply in this amount of
// time, the connection will be closed by the server.
GRPCKeepaliveTimeout time.Duration
// HTTPAddrs contains the list of TCP addresses and UNIX sockets the HTTP
// server will bind to. If the HTTP endpoint is disabled (ports.http <= 0)
// the list is empty.

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@ -6430,6 +6430,8 @@ func TestLoad_FullConfig(t *testing.T) {
GRPCAddrs: []net.Addr{tcpAddr("32.31.61.91:4881")},
GRPCTLSPort: 5201,
GRPCTLSAddrs: []net.Addr{tcpAddr("23.14.88.19:5201")},
GRPCKeepaliveInterval: 33 * time.Second,
GRPCKeepaliveTimeout: 22 * time.Second,
HTTPAddrs: []net.Addr{tcpAddr("83.39.91.39:7999")},
HTTPBlockEndpoints: []string{"RBvAFcGD", "fWOWFznh"},
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 @@
"GRPCPort": 0,
"GRPCTLSAddrs": [],
"GRPCTLSPort": 0,
"GRPCKeepaliveInterval": "0s",
"GRPCKeepaliveTimeout": "0s",
"GossipLANGossipInterval": "0s",
"GossipLANGossipNodes": 0,
"GossipLANProbeInterval": "0s",

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@ -335,6 +335,8 @@ performance {
leave_drain_time = "8265s"
raft_multiplier = 5
rpc_hold_timeout = "15707s"
grpc_keepalive_interval = "33s"
grpc_keepalive_timeout = "22s"
}
pid_file = "43xN80Km"
ports {

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@ -383,7 +383,9 @@
"performance": {
"leave_drain_time": "8265s",
"raft_multiplier": 5,
"rpc_hold_timeout": "15707s"
"rpc_hold_timeout": "15707s",
"grpc_keepalive_interval": "33s",
"grpc_keepalive_timeout": "22s"
},
"pid_file": "43xN80Km",
"ports": {

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@ -26,6 +26,7 @@ import (
"github.com/stretchr/testify/require"
"golang.org/x/time/rate"
"google.golang.org/grpc"
"google.golang.org/grpc/keepalive"
"github.com/hashicorp/consul-net-rpc/net/rpc"
@ -335,7 +336,7 @@ func newServerWithDeps(t *testing.T, c *Config, deps Deps) (*Server, error) {
oldNotify()
}
}
grpcServer := external.NewServer(deps.Logger.Named("grpc.external"), nil, deps.TLSConfigurator, rpcRate.NullRequestLimitsHandler())
grpcServer := external.NewServer(deps.Logger.Named("grpc.external"), nil, deps.TLSConfigurator, rpcRate.NullRequestLimitsHandler(), keepalive.ServerParameters{})
srv, err := NewServer(c, deps, grpcServer, nil, deps.Logger)
if err != nil {
return nil, err

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@ -27,7 +27,13 @@ var (
// NewServer constructs a gRPC server for the external gRPC port, to which
// handlers can be registered.
func NewServer(logger agentmiddleware.Logger, metricsObj *metrics.Metrics, tls *tlsutil.Configurator, limiter rate.RequestLimitsHandler) *grpc.Server {
func NewServer(
logger agentmiddleware.Logger,
metricsObj *metrics.Metrics,
tls *tlsutil.Configurator,
limiter rate.RequestLimitsHandler,
keepaliveParams keepalive.ServerParameters,
) *grpc.Server {
if metricsObj == nil {
metricsObj = metrics.Default()
}
@ -56,6 +62,7 @@ func NewServer(logger agentmiddleware.Logger, metricsObj *metrics.Metrics, tls *
grpc.StatsHandler(agentmiddleware.NewStatsHandler(metricsObj, metricsLabels)),
middleware.WithUnaryServerChain(unaryInterceptors...),
middleware.WithStreamServerChain(streamInterceptors...),
grpc.KeepaliveParams(keepaliveParams),
grpc.KeepaliveEnforcementPolicy(keepalive.EnforcementPolicy{
// This must be less than the keealive.ClientParameters Time setting, otherwise
// the server will disconnect the client for sending too many keepalive pings.

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@ -14,6 +14,7 @@ import (
"github.com/stretchr/testify/require"
"golang.org/x/sync/errgroup"
"google.golang.org/grpc"
"google.golang.org/grpc/keepalive"
"github.com/hashicorp/go-hclog"
@ -27,7 +28,7 @@ import (
func TestServer_EmitsStats(t *testing.T) {
sink, metricsObj := testutil.NewFakeSink(t)
srv := NewServer(hclog.Default(), metricsObj, nil, rate.NullRequestLimitsHandler())
srv := NewServer(hclog.Default(), metricsObj, nil, rate.NullRequestLimitsHandler(), keepalive.ServerParameters{})
testservice.RegisterSimpleServer(srv, &testservice.Simple{})

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@ -21,6 +21,7 @@ import (
"github.com/stretchr/testify/require"
gogrpc "google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/keepalive"
"google.golang.org/grpc/metadata"
grpcstatus "google.golang.org/grpc/status"
"google.golang.org/protobuf/proto"
@ -1816,7 +1817,7 @@ func newTestServer(t *testing.T, cb func(conf *consul.Config)) testingServer {
conf.ACLResolverSettings.EnterpriseMeta = *conf.AgentEnterpriseMeta()
deps := newDefaultDeps(t, conf)
externalGRPCServer := external.NewServer(deps.Logger, nil, deps.TLSConfigurator, rate.NullRequestLimitsHandler())
externalGRPCServer := external.NewServer(deps.Logger, nil, deps.TLSConfigurator, rate.NullRequestLimitsHandler(), keepalive.ServerParameters{})
server, err := consul.NewServer(conf, deps, externalGRPCServer, nil, deps.Logger)
require.NoError(t, err)

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@ -607,6 +607,10 @@ Refer to the [formatting specification](https://golang.org/pkg/time/#ParseDurati
This was added in Consul 1.0. Must be a duration value such as 10s. Defaults
to 7s.
- `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`.
- `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`.
- `pid_file` Equivalent to the [`-pid-file` command line flag](/consul/docs/agent/config/cli-flags#_pid_file).
- `ports` This is a nested object that allows setting the bind ports for the following keys: