a7fb26f50f
This is like a Möbius strip of code due to the fact that low-level components (serf/memberlist) are connected to high-level components (the catalog and mesh-gateways) in a twisty maze of references which make it hard to dive into. With that in mind here's a high level summary of what you'll find in the patch:
There are several distinct chunks of code that are affected:
* new flags and config options for the server
* retry join WAN is slightly different
* retry join code is shared to discover primary mesh gateways from secondary datacenters
* because retry join logic runs in the *agent* and the results of that
operation for primary mesh gateways are needed in the *server* there are
some methods like `RefreshPrimaryGatewayFallbackAddresses` that must occur
at multiple layers of abstraction just to pass the data down to the right
layer.
* new cache type `FederationStateListMeshGatewaysName` for use in `proxycfg/xds` layers
* the function signature for RPC dialing picked up a new required field (the
node name of the destination)
* several new RPCs for manipulating a FederationState object:
`FederationState:{Apply,Get,List,ListMeshGateways}`
* 3 read-only internal APIs for debugging use to invoke those RPCs from curl
* raft and fsm changes to persist these FederationStates
* replication for FederationStates as they are canonically stored in the
Primary and replicated to the Secondaries.
* a special derivative of anti-entropy that runs in secondaries to snapshot
their local mesh gateway `CheckServiceNodes` and sync them into their upstream
FederationState in the primary (this works in conjunction with the
replication to distribute addresses for all mesh gateways in all DCs to all
other DCs)
* a "gateway locator" convenience object to make use of this data to choose
the addresses of gateways to use for any given RPC or gossip operation to a
remote DC. This gets data from the "retry join" logic in the agent and also
directly calls into the FSM.
* RPC (`:8300`) on the server sniffs the first byte of a new connection to
determine if it's actually doing native TLS. If so it checks the ALPN header
for protocol determination (just like how the existing system uses the
type-byte marker).
* 2 new kinds of protocols are exclusively decoded via this native TLS
mechanism: one for ferrying "packet" operations (udp-like) from the gossip
layer and one for "stream" operations (tcp-like). The packet operations
re-use sockets (using length-prefixing) to cut down on TLS re-negotiation
overhead.
* the server instances specially wrap the `memberlist.NetTransport` when running
with gateway federation enabled (in a `wanfed.Transport`). The general gist is
that if it tries to dial a node in the SAME datacenter (deduced by looking
at the suffix of the node name) there is no change. If dialing a DIFFERENT
datacenter it is wrapped up in a TLS+ALPN blob and sent through some mesh
gateways to eventually end up in a server's :8300 port.
* a new flag when launching a mesh gateway via `consul connect envoy` to
indicate that the servers are to be exposed. This sets a special service
meta when registering the gateway into the catalog.
* `proxycfg/xds` notice this metadata blob to activate additional watches for
the FederationState objects as well as the location of all of the consul
servers in that datacenter.
* `xds:` if the extra metadata is in place additional clusters are defined in a
DC to bulk sink all traffic to another DC's gateways. For the current
datacenter we listen on a wildcard name (`server.<dc>.consul`) that load
balances all servers as well as one mini-cluster per node
(`<node>.server.<dc>.consul`)
* the `consul tls cert create` command got a new flag (`-node`) to help create
an additional SAN in certs that can be used with this flavor of federation.
120 lines
8.4 KiB
Go
120 lines
8.4 KiB
Go
package config
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import (
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"flag"
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"fmt"
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"time"
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)
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// Flags defines the command line flags.
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type Flags struct {
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// Config contains the command line arguments that can also be set
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// in a config file.
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Config Config
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// ConfigFiles contains the list of config files and directories
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// that should be read.
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ConfigFiles []string
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// ConfigFormat forces all config files to be interpreted as this
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// format independent of their extension.
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ConfigFormat *string
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// HCL contains an arbitrary config in hcl format.
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// DevMode indicates whether the agent should be started in development
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// mode. This cannot be configured in a config file.
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DevMode *bool
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HCL []string
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// Args contains the remaining unparsed flags.
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Args []string
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}
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// AddFlags adds the command line flags for the agent.
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func AddFlags(fs *flag.FlagSet, f *Flags) {
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add := func(p interface{}, name, help string) {
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switch x := p.(type) {
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case **bool:
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fs.Var(newBoolPtrValue(x), name, help)
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case **time.Duration:
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fs.Var(newDurationPtrValue(x), name, help)
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case **int:
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fs.Var(newIntPtrValue(x), name, help)
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case **string:
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fs.Var(newStringPtrValue(x), name, help)
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case *[]string:
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fs.Var(newStringSliceValue(x), name, help)
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case *map[string]string:
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fs.Var(newStringMapValue(x), name, help)
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default:
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panic(fmt.Sprintf("invalid type: %T", p))
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}
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}
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// command line flags ordered by flag name
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add(&f.Config.AdvertiseAddrLAN, "advertise", "Sets the advertise address to use.")
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add(&f.Config.AdvertiseAddrWAN, "advertise-wan", "Sets address to advertise on WAN instead of -advertise address.")
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add(&f.Config.BindAddr, "bind", "Sets the bind address for cluster communication.")
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add(&f.Config.Ports.Server, "server-port", "Sets the server port to listen on.")
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add(&f.Config.Bootstrap, "bootstrap", "Sets server to bootstrap mode.")
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add(&f.Config.BootstrapExpect, "bootstrap-expect", "Sets server to expect bootstrap mode.")
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add(&f.Config.ClientAddr, "client", "Sets the address to bind for client access. This includes RPC, DNS, HTTP, HTTPS and gRPC (if configured).")
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add(&f.Config.CheckOutputMaxSize, "check_output_max_size", "Sets the maximum output size for checks on this agent")
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add(&f.ConfigFiles, "config-dir", "Path to a directory to read configuration files from. This will read every file ending in '.json' as configuration in this directory in alphabetical order. Can be specified multiple times.")
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add(&f.ConfigFiles, "config-file", "Path to a file in JSON or HCL format with a matching file extension. Can be specified multiple times.")
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add(&f.ConfigFormat, "config-format", "Config files are in this format irrespective of their extension. Must be 'hcl' or 'json'")
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add(&f.Config.DataDir, "data-dir", "Path to a data directory to store agent state.")
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add(&f.Config.Datacenter, "datacenter", "Datacenter of the agent.")
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add(&f.Config.DefaultQueryTime, "default-query-time", "the amount of time a blocking query will wait before Consul will force a response. This value can be overridden by the 'wait' query parameter.")
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add(&f.DevMode, "dev", "Starts the agent in development mode.")
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add(&f.Config.DisableHostNodeID, "disable-host-node-id", "Setting this to true will prevent Consul from using information from the host to generate a node ID, and will cause Consul to generate a random node ID instead.")
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add(&f.Config.DisableKeyringFile, "disable-keyring-file", "Disables the backing up of the keyring to a file.")
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add(&f.Config.Ports.DNS, "dns-port", "DNS port to use.")
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add(&f.Config.DNSDomain, "domain", "Domain to use for DNS interface.")
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add(&f.Config.DNSAltDomain, "alt-domain", "Alternate domain to use for DNS interface.")
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add(&f.Config.EnableScriptChecks, "enable-script-checks", "Enables health check scripts.")
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add(&f.Config.EnableLocalScriptChecks, "enable-local-script-checks", "Enables health check scripts from configuration file.")
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add(&f.Config.HTTPConfig.AllowWriteHTTPFrom, "allow-write-http-from", "Only allow write endpoint calls from given network. CIDR format, can be specified multiple times.")
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add(&f.Config.EncryptKey, "encrypt", "Provides the gossip encryption key.")
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add(&f.Config.Ports.GRPC, "grpc-port", "Sets the gRPC API port to listen on (currently needed for Envoy xDS only).")
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add(&f.Config.Ports.HTTP, "http-port", "Sets the HTTP API port to listen on.")
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add(&f.Config.Ports.HTTPS, "https-port", "Sets the HTTPS API port to listen on.")
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add(&f.Config.StartJoinAddrsLAN, "join", "Address of an agent to join at start time. Can be specified multiple times.")
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add(&f.Config.StartJoinAddrsWAN, "join-wan", "Address of an agent to join -wan at start time. Can be specified multiple times.")
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add(&f.Config.LogLevel, "log-level", "Log level of the agent.")
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add(&f.Config.LogJSON, "log-json", "Output logs in JSON format.")
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add(&f.Config.LogFile, "log-file", "Path to the file the logs get written to")
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add(&f.Config.LogRotateBytes, "log-rotate-bytes", "Maximum number of bytes that should be written to a log file")
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add(&f.Config.LogRotateDuration, "log-rotate-duration", "Time after which log rotation needs to be performed")
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add(&f.Config.LogRotateMaxFiles, "log-rotate-max-files", "Maximum number of log file archives to keep")
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add(&f.Config.MaxQueryTime, "max-query-time", "the maximum amount of time a blocking query can wait before Consul will force a response. Consul applies jitter to the wait time. The jittered time will be capped to MaxQueryTime.")
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add(&f.Config.NodeName, "node", "Name of this node. Must be unique in the cluster.")
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add(&f.Config.NodeID, "node-id", "A unique ID for this node across space and time. Defaults to a randomly-generated ID that persists in the data-dir.")
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add(&f.Config.NodeMeta, "node-meta", "An arbitrary metadata key/value pair for this node, of the format `key:value`. Can be specified multiple times.")
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add(&f.Config.NonVotingServer, "non-voting-server", "(Enterprise-only) This flag is used to make the server not participate in the Raft quorum, and have it only receive the data replication stream. This can be used to add read scalability to a cluster in cases where a high volume of reads to servers are needed.")
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add(&f.Config.PidFile, "pid-file", "Path to file to store agent PID.")
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add(&f.Config.RPCProtocol, "protocol", "Sets the protocol version. Defaults to latest.")
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add(&f.Config.RaftProtocol, "raft-protocol", "Sets the Raft protocol version. Defaults to latest.")
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add(&f.Config.DNSRecursors, "recursor", "Address of an upstream DNS server. Can be specified multiple times.")
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add(&f.Config.PrimaryGateways, "primary-gateway", "Address of a mesh gateway in the primary datacenter to use to bootstrap WAN federation at start time with retries enabled. Can be specified multiple times.")
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add(&f.Config.RejoinAfterLeave, "rejoin", "Ignores a previous leave and attempts to rejoin the cluster.")
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add(&f.Config.RetryJoinIntervalLAN, "retry-interval", "Time to wait between join attempts.")
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add(&f.Config.RetryJoinIntervalWAN, "retry-interval-wan", "Time to wait between join -wan attempts.")
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add(&f.Config.RetryJoinLAN, "retry-join", "Address of an agent to join at start time with retries enabled. Can be specified multiple times.")
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add(&f.Config.RetryJoinWAN, "retry-join-wan", "Address of an agent to join -wan at start time with retries enabled. Can be specified multiple times.")
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add(&f.Config.RetryJoinMaxAttemptsLAN, "retry-max", "Maximum number of join attempts. Defaults to 0, which will retry indefinitely.")
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add(&f.Config.RetryJoinMaxAttemptsWAN, "retry-max-wan", "Maximum number of join -wan attempts. Defaults to 0, which will retry indefinitely.")
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add(&f.Config.SerfBindAddrLAN, "serf-lan-bind", "Address to bind Serf LAN listeners to.")
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add(&f.Config.Ports.SerfLAN, "serf-lan-port", "Sets the Serf LAN port to listen on.")
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add(&f.Config.SegmentName, "segment", "(Enterprise-only) Sets the network segment to join.")
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add(&f.Config.SerfBindAddrWAN, "serf-wan-bind", "Address to bind Serf WAN listeners to.")
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add(&f.Config.Ports.SerfWAN, "serf-wan-port", "Sets the Serf WAN port to listen on.")
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add(&f.Config.ServerMode, "server", "Switches agent to server mode.")
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add(&f.Config.EnableSyslog, "syslog", "Enables logging to syslog.")
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add(&f.Config.UI, "ui", "Enables the built-in static web UI server.")
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add(&f.Config.UIContentPath, "ui-content-path", "Sets the external UI path to a string. Defaults to: /ui/ ")
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add(&f.Config.UIDir, "ui-dir", "Path to directory containing the web UI resources.")
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add(&f.HCL, "hcl", "hcl config fragment. Can be specified multiple times.")
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}
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