mirror of https://github.com/status-im/consul.git
Website: cleanup for the docs/agent/options Command-line options section.
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Ryan Breen
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@ -3,24 +3,26 @@ layout: "docs"
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page_title: "Configuration"
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sidebar_current: "docs-agent-config"
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description: |-
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The agent has various configuration options that can be specified via the command-line or via configuration files. All of the configuration options are completely optional and their defaults will be specified with their descriptions.
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The agent has various configuration options that can be specified via the command-line or via configuration files. All of the configuration options are completely optional. Defaults are specified with their descriptions.
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---
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# Configuration
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The agent has various configuration options that can be specified via
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the command-line or via configuration files. All of the configuration
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options are completely optional and their defaults will be specified
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with their descriptions.
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options are completely optional. Defaults are specified with their
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descriptions.
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When loading configuration, Consul loads the configuration from files
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and directories in the order specified. Configuration specified later
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and directories in lexical order. For example, configuration file `basic_config.json`
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will be processed before `extra_config.js`. Configuration specified later
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will be merged into configuration specified earlier. In most cases,
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"merge" means that the later version will override the earlier. But in
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some cases, such as event handlers, merging just appends the handlers.
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The exact merging behavior will be specified.
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"merge" means that the later version will override the earlier. In
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some cases, such as event handlers, merging appends the handlers to the
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existing configuration. The exact merging behavior is specified for each
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option below.
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Consul also supports reloading of configuration when it receives the
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Consul also supports reloading configuration when it receives the
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SIGHUP signal. Not all changes are respected, but those that are
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are documented below in the
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[Reloadable Configuration](#reloadable-configuration) section. The
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@ -34,64 +36,64 @@ The options below are all specified on the command-line.
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* `-advertise` - The advertise address is used to change the address that we
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advertise to other nodes in the cluster. By default, the `-bind` address is
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advertised. However, in some cases, there may be a routable address that cannot
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be bound to. This flag enables gossiping a different address to support this.
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If this address is not routable, the node will be in a constant flapping state,
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be bound. This flag enables gossiping a different address to support this.
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If this address is not routable, the node will be in a constant flapping state
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as other nodes will treat the non-routability as a failure.
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* `-bootstrap` - This flag is used to control if a server is in "bootstrap" mode. It is important that
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no more than one server *per* data center be running in this mode. Technically, a server in bootstrap mode
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is allowed to self-elect as the Raft leader. It is important that only a single node is in this mode,
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because otherwise consistency cannot be guaranteed if multiple nodes are able to self-elect.
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is allowed to self-elect as the Raft leader. It is important that only a single node is in this mode;
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otherwise, consistency cannot be guaranteed as multiple nodes are able to self-elect.
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It is not recommended to use this flag after a cluster has been bootstrapped.
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* `-bootstrap-expect` - This flag provides the number of expected servers in the data center.
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Either this value should not be provided, or the value must agree with other servers in
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Either this value should not be provided or the value must agree with other servers in
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the cluster. When provided, Consul waits until the specified number of servers are
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available, and then bootstraps the cluster. This allows an initial leader to be elected
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available and then bootstraps the cluster. This allows an initial leader to be elected
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automatically. This cannot be used in conjunction with the `-bootstrap` flag.
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* `-bind` - The address that should be bound to for internal cluster communications.
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This is an IP address that should be reachable by all other nodes in the cluster.
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By default this is "0.0.0.0", meaning Consul will use the first available private
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IP address. Consul uses both TCP and UDP and use the same port for both, so if you
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have any firewalls be sure to allow both protocols.
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By default, this is "0.0.0.0", meaning Consul will use the first available private
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IP address. Consul uses both TCP and UDP and the same port for both. If you
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have any firewalls, be sure to allow both protocols.
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* `-client` - The address that Consul will bind to client interfaces. This
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includes the HTTP, DNS, and RPC servers. By default this is "127.0.0.1"
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* `-client` - The address to which Consul will bind client interfaces,
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including the HTTP, DNS, and RPC servers. By default, this is "127.0.0.1",
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allowing only loopback connections. The RPC address is used by other Consul
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commands, such as `consul members`, in order to query a running Consul agent.
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* `-config-file` - A configuration file to load. For more information on
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the format of this file, read the "Configuration Files" section below.
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the format of this file, read the [Configuration Files](#configuration_files) section.
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This option can be specified multiple times to load multiple configuration
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files. If it is specified multiple times, configuration files loaded later
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will merge with configuration files loaded earlier. During a config merge,
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single-value keys (string, int, bool) will simply have their values replaced,
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single-value keys (string, int, bool) will simply have their values replaced
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while list types will be appended together.
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* `-config-dir` - A directory of configuration files to load. Consul will
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load all files in this directory ending in ".json" as configuration files
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in alphabetical order using the same merge routine as the `config-file`
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load all files in this directory with the suffix ".json". The load order
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is alphabetical order, and the the same merge routine is used as with the `config-file`
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option above. For more information on the format of the configuration files,
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see the "Configuration Files" section below.
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see the [Configuration Files](#configuration_files) section.
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* `-data-dir` - This flag provides a data directory for the agent to store state.
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This is required for all agents. The directory should be durable across reboots.
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This is especially critical for agents that are running in server mode, as they
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must be able to persist the cluster state. Additional, the directory must support
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This is especially critical for agents that are running in server mode as they
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must be able to persist cluster state. Additionally, the directory must support
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the use of filesystem locking, meaning some types of mounted folders (e.g. VirtualBox
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shared folders) may not be suitable.
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* `-dc` - This flag controls the datacenter the agent is running in. If not provided
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it defaults to "dc1". Consul has first class support for multiple data centers but
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* `-dc` - This flag controls the data center in which the agent is running. If not provided,
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it defaults to "dc1". Consul has first-class support for multiple data centers but
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it relies on proper configuration. Nodes in the same data center should be on a single
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LAN.
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* `-encrypt` - Specifies the secret key to use for encryption of Consul
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network traffic. This key must be 16-bytes that are base64 encoded. The
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network traffic. This key must be 16-bytes that are Base64 encoded. The
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easiest way to create an encryption key is to use `consul keygen`. All
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nodes within a cluster must share the same encryption key to communicate.
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The provided key is automatically persisted to the data directory, and loaded
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The provided key is automatically persisted to the data directory and loaded
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automatically whenever the agent is restarted. This means that to encrypt
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Consul's gossip protocol, this option only needs to be provided once on each
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agent's initial startup sequence. If it is provided after Consul has been
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@ -103,37 +105,36 @@ The options below are all specified on the command-line.
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unable to join with any of the specified addresses, agent startup will
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fail. By default, the agent won't join any nodes when it starts up.
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* `-retry-join` - Similar to `-join`, but allows retrying a join if the first
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* `-retry-join` - Similar to `-join` but allows retrying a join if the first
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attempt fails. This is useful for cases where we know the address will become
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available eventually.
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* `-retry-interval` - Time to wait between join attempts. Defaults to 30s.
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* `-retry-max` - The maximum number of join attempts to be made before exiting
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with return code 1. By default, this is set to 0, which will continue to
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retry the join indefinitely.
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with return code 1. By default, this is set to 0 which is interpreted as infinite
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retries.
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* `-join-wan` - Address of another wan agent to join upon starting up. This can be
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specified multiple times to specify multiple agents that are on the WAN to join. If Consul is
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specified multiple times to specify multiple WAN agents to join. If Consul is
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unable to join with any of the specified addresses, agent startup will
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fail. By default, the agent won't join -wan any nodes when it starts up.
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fail. By default, the agent won't `-join-wan` any nodes when it starts up.
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* `-retry-join-wan` - Similar to `retry-join`, but allows retrying a wan join if the first
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* `-retry-join-wan` - Similar to `retry-join` but allows retrying a wan join if the first
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attempt fails. This is useful for cases where we know the address will become
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available eventually.
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* `-retry-interval-wan` - Time to wait between join -wan attempts. Defaults to 30s.
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* `-retry-interval-wan` - Time to wait between `-join-wan` attempts. Defaults to 30s.
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* `-retry-max-wan` - The maximum number of join -wan attempts to be made before exiting
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with return code 1. By default, this is set to 0, which will continue to
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retry the join -wan indefinitely.
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* `-retry-max-wan` - The maximum number of `-join-wan` attempts to be made before exiting
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with return code 1. By default, this is set to 0 which is interpreted as infinite
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retries.
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* `-log-level` - The level of logging to show after the Consul agent has
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started. This defaults to "info". The available log levels are "trace",
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"debug", "info", "warn", "err". This is the log level that will be shown
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for the agent output, but note you can always connect via `consul monitor`
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to an agent at any log level. The log level can be changed during a
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config reload.
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"debug", "info", "warn", and "err". Note that you can always connect to an
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agent via `consul monitor` and use any log level. Also, the log level can
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be changed during a config reload.
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* `-node` - The name of this node in the cluster. This must be unique within
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the cluster. By default this is the hostname of the machine.
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@ -142,14 +143,14 @@ The options below are all specified on the command-line.
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version. This should be set only when [upgrading](/docs/upgrading.html).
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You can view the protocol versions supported by Consul by running `consul -v`.
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* `-rejoin` - When provided Consul will ignore a previous leave and attempt to
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* `-rejoin` - When provided, Consul will ignore a previous leave and attempt to
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rejoin the cluster when starting. By default, Consul treats leave as a permanent
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intent, and does not attempt to join the cluster again when starting. This flag
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intent and does not attempt to join the cluster again when starting. This flag
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allows the previous state to be used to rejoin the cluster.
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* `-server` - This flag is used to control if an agent is in server or client mode. When provided,
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an agent will act as a Consul server. Each Consul cluster must have at least one server, and ideally
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no more than 5 *per* datacenter. All servers participate in the Raft consensus algorithm, to ensure that
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an agent will act as a Consul server. Each Consul cluster must have at least one server and ideally
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no more than 5 per data center. All servers participate in the Raft consensus algorithm to ensure that
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transactions occur in a consistent, linearizable manner. Transactions modify cluster state, which
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is maintained on all server nodes to ensure availability in the case of node failure. Server nodes also
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participate in a WAN gossip pool with server nodes in other data centers. Servers act as gateways
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@ -158,13 +159,13 @@ The options below are all specified on the command-line.
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* `-syslog` - This flag enables logging to syslog. This is only supported on Linux
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and OSX. It will result in an error if provided on Windows.
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* `-ui-dir` - This flag provides a the directory containing the Web UI resources
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for Consul. This must be provided to enable the Web UI. Directory must be readable.
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* `-ui-dir` - This flag provides the directory containing the Web UI resources
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for Consul. This must be provided to enable the Web UI. The directory must be readable.
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* `-pid-file` - This flag provides the file path for the agent to store it's PID. This is useful for
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sending signals to the agent, such as `SIGINT` to close it or `SIGHUP` to update check definitions.
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* `-pid-file` - This flag provides the file path for the agent to store its PID. This is useful for
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sending signals (for example, `SIGINT` to close the agent or `SIGHUP` to update check definitions) to the agent.
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## Configuration Files
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## <a name="configuration_files"></a> Configuration Files
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In addition to the command-line options, configuration can be put into
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files. This may be easier in certain situations, for example when Consul is
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