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Merge pull request #700 from ryanbreen/options 

Website: cleanup for the docs/agent/options Command-line options section
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Armon Dadgar 2015-02-13 17:21:05 -08:00
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@ -3,24 +3,26 @@ layout: "docs"
page_title: "Configuration"
sidebar_current: "docs-agent-config"
description: |-
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.
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.
---
# Configuration
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.
options are completely optional. Defaults are specified with their
descriptions.
When loading configuration, Consul loads the configuration from files
and directories in the order specified. Configuration specified later
and directories in lexical order. For example, configuration file `basic_config.json`
will be processed before `extra_config.js`. Configuration specified later
will be merged into configuration specified earlier. In most cases,
"merge" means that the later version will override the earlier. But in
some cases, such as event handlers, merging just appends the handlers.
The exact merging behavior will be specified.
"merge" means that the later version will override the earlier. In
some cases, such as event handlers, merging appends the handlers to the
existing configuration. The exact merging behavior is specified for each
option below.
Consul also supports reloading of configuration when it receives the
Consul also supports reloading configuration when it receives the
SIGHUP signal. Not all changes are respected, but those that are
are documented below in the
[Reloadable Configuration](#reloadable-configuration) section. The
@ -34,64 +36,64 @@ The options below are all specified on the command-line.
* `-advertise` - The advertise address is used to change the address that we
advertise to other nodes in the cluster. By default, the `-bind` address is
advertised. However, in some cases, there may be a routable address that cannot
be bound to. This flag enables gossiping a different address to support this.
If this address is not routable, the node will be in a constant flapping state,
be bound. This flag enables gossiping a different address to support this.
If this address is not routable, the node will be in a constant flapping state
as other nodes will treat the non-routability as a failure.
* `-bootstrap` - This flag is used to control if a server is in "bootstrap" mode. It is important that
no more than one server *per* data center be running in this mode. Technically, a server in bootstrap mode
is allowed to self-elect as the Raft leader. It is important that only a single node is in this mode,
because otherwise consistency cannot be guaranteed if multiple nodes are able to self-elect.
is allowed to self-elect as the Raft leader. It is important that only a single node is in this mode;
otherwise, consistency cannot be guaranteed as multiple nodes are able to self-elect.
It is not recommended to use this flag after a cluster has been bootstrapped.
* `-bootstrap-expect` - This flag provides the number of expected servers in the data center.
Either this value should not be provided, or the value must agree with other servers in
Either this value should not be provided or the value must agree with other servers in
the cluster. When provided, Consul waits until the specified number of servers are
available, and then bootstraps the cluster. This allows an initial leader to be elected
available and then bootstraps the cluster. This allows an initial leader to be elected
automatically. This cannot be used in conjunction with the `-bootstrap` flag.
* `-bind` - The address that should be bound to for internal cluster communications.
This is an IP address that should be reachable by all other nodes in the cluster.
By default this is "0.0.0.0", meaning Consul will use the first available private
IP address. Consul uses both TCP and UDP and use the same port for both, so if you
have any firewalls be sure to allow both protocols.
By default, this is "0.0.0.0", meaning Consul will use the first available private
IP address. Consul uses both TCP and UDP and the same port for both. If you
have any firewalls, be sure to allow both protocols.
* `-client` - The address that Consul will bind to client interfaces. This
includes the HTTP, DNS, and RPC servers. By default this is "127.0.0.1"
* `-client` - The address to which Consul will bind client interfaces,
including the HTTP, DNS, and RPC servers. By default, this is "127.0.0.1",
allowing only loopback connections. The RPC address is used by other Consul
commands, such as `consul members`, in order to query a running Consul agent.
* `-config-file` - A configuration file to load. For more information on
the format of this file, read the "Configuration Files" section below.
the format of this file, read the [Configuration Files](#configuration_files) section.
This option can be specified multiple times to load multiple configuration
files. If it is specified multiple times, configuration files loaded later
will merge with configuration files loaded earlier. During a config merge,
single-value keys (string, int, bool) will simply have their values replaced,
single-value keys (string, int, bool) will simply have their values replaced
while list types will be appended together.
* `-config-dir` - A directory of configuration files to load. Consul will
load all files in this directory ending in ".json" as configuration files
in alphabetical order using the same merge routine as the `config-file`
load all files in this directory with the suffix ".json". The load order
is alphabetical, and the the same merge routine is used as with the `config-file`
option above. For more information on the format of the configuration files,
see the "Configuration Files" section below.
see the [Configuration Files](#configuration_files) section.
* `-data-dir` - This flag provides a data directory for the agent to store state.
This is required for all agents. The directory should be durable across reboots.
This is especially critical for agents that are running in server mode, as they
must be able to persist the cluster state. Additional, the directory must support
This is especially critical for agents that are running in server mode as they
must be able to persist cluster state. Additionally, the directory must support
the use of filesystem locking, meaning some types of mounted folders (e.g. VirtualBox
shared folders) may not be suitable.
* `-dc` - This flag controls the datacenter the agent is running in. If not provided
it defaults to "dc1". Consul has first class support for multiple data centers but
* `-dc` - This flag controls the data center in which the agent is running. If not provided,
it defaults to "dc1". Consul has first-class support for multiple data centers, but
it relies on proper configuration. Nodes in the same data center should be on a single
LAN.
* `-encrypt` - Specifies the secret key to use for encryption of Consul
network traffic. This key must be 16-bytes that are base64 encoded. The
network traffic. This key must be 16-bytes that are Base64-encoded. The
easiest way to create an encryption key is to use `consul keygen`. All
nodes within a cluster must share the same encryption key to communicate.
The provided key is automatically persisted to the data directory, and loaded
The provided key is automatically persisted to the data directory and loaded
automatically whenever the agent is restarted. This means that to encrypt
Consul's gossip protocol, this option only needs to be provided once on each
agent's initial startup sequence. If it is provided after Consul has been
@ -103,37 +105,36 @@ The options below are all specified on the command-line.
unable to join with any of the specified addresses, agent startup will
fail. By default, the agent won't join any nodes when it starts up.
* `-retry-join` - Similar to `-join`, but allows retrying a join if the first
* `-retry-join` - Similar to `-join` but allows retrying a join if the first
attempt fails. This is useful for cases where we know the address will become
available eventually.
* `-retry-interval` - Time to wait between join attempts. Defaults to 30s.
* `-retry-max` - The maximum number of join attempts to be made before exiting
with return code 1. By default, this is set to 0, which will continue to
retry the join indefinitely.
with return code 1. By default, this is set to 0 which is interpreted as infinite
retries.
* `-join-wan` - Address of another wan agent to join upon starting up. This can be
specified multiple times to specify multiple agents that are on the WAN to join. If Consul is
specified multiple times to specify multiple WAN agents to join. If Consul is
unable to join with any of the specified addresses, agent startup will
fail. By default, the agent won't join -wan any nodes when it starts up.
fail. By default, the agent won't `-join-wan` any nodes when it starts up.
* `-retry-join-wan` - Similar to `retry-join`, but allows retrying a wan join if the first
* `-retry-join-wan` - Similar to `retry-join` but allows retrying a wan join if the first
attempt fails. This is useful for cases where we know the address will become
available eventually.
* `-retry-interval-wan` - Time to wait between join -wan attempts. Defaults to 30s.
* `-retry-interval-wan` - Time to wait between `-join-wan` attempts. Defaults to 30s.
* `-retry-max-wan` - The maximum number of join -wan attempts to be made before exiting
with return code 1. By default, this is set to 0, which will continue to
retry the join -wan indefinitely.
* `-retry-max-wan` - The maximum number of `-join-wan` attempts to be made before exiting
with return code 1. By default, this is set to 0 which is interpreted as infinite
retries.
* `-log-level` - The level of logging to show after the Consul agent has
started. This defaults to "info". The available log levels are "trace",
"debug", "info", "warn", "err". This is the log level that will be shown
for the agent output, but note you can always connect via `consul monitor`
to an agent at any log level. The log level can be changed during a
config reload.
"debug", "info", "warn", and "err". Note that you can always connect to an
agent via `consul monitor` and use any log level. Also, the log level can
be changed during a config reload.
* `-node` - The name of this node in the cluster. This must be unique within
the cluster. By default this is the hostname of the machine.
@ -142,14 +143,14 @@ The options below are all specified on the command-line.
version. This should be set only when [upgrading](/docs/upgrading.html).
You can view the protocol versions supported by Consul by running `consul -v`.
* `-rejoin` - When provided Consul will ignore a previous leave and attempt to
* `-rejoin` - When provided, Consul will ignore a previous leave and attempt to
rejoin the cluster when starting. By default, Consul treats leave as a permanent
intent, and does not attempt to join the cluster again when starting. This flag
intent and does not attempt to join the cluster again when starting. This flag
allows the previous state to be used to rejoin the cluster.
* `-server` - This flag is used to control if an agent is in server or client mode. When provided,
an agent will act as a Consul server. Each Consul cluster must have at least one server, and ideally
no more than 5 *per* datacenter. All servers participate in the Raft consensus algorithm, to ensure that
an agent will act as a Consul server. Each Consul cluster must have at least one server and ideally
no more than 5 per data center. All servers participate in the Raft consensus algorithm to ensure that
transactions occur in a consistent, linearizable manner. Transactions modify cluster state, which
is maintained on all server nodes to ensure availability in the case of node failure. Server nodes also
participate in a WAN gossip pool with server nodes in other data centers. Servers act as gateways
@ -158,13 +159,13 @@ The options below are all specified on the command-line.
* `-syslog` - This flag enables logging to syslog. This is only supported on Linux
and OSX. It will result in an error if provided on Windows.
* `-ui-dir` - This flag provides a the directory containing the Web UI resources
for Consul. This must be provided to enable the Web UI. Directory must be readable.
* `-ui-dir` - This flag provides the directory containing the Web UI resources
for Consul. This must be provided to enable the Web UI. The directory must be readable.
* `-pid-file` - This flag provides the file path for the agent to store it's PID. This is useful for
sending signals to the agent, such as `SIGINT` to close it or `SIGHUP` to update check definitions.
* `-pid-file` - This flag provides the file path for the agent to store its PID. This is useful for
sending signals (for example, `SIGINT` to close the agent or `SIGHUP` to update check definitions) to the agent.
## Configuration Files
## <a name="configuration_files"></a> Configuration Files
In addition to the command-line options, configuration can be put into
files. This may be easier in certain situations, for example when Consul is