84 lines
3.7 KiB
Plaintext
84 lines
3.7 KiB
Plaintext
---
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layout: docs
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page_title: Configuration
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description: >-
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The agent has various configuration options that can be specified via the
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command-line or via configuration files. All of the configuration options are
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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. Defaults are specified with their
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descriptions.
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Configuration precedence is evaluated in the following order:
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1. [Command line arguments](/docs/agent/config/cli-flags)
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2. [Configuration files](/docs/agent/config/config-files)
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When loading configuration, Consul loads the configuration from files and
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directories in lexical order. For example, configuration file
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`basic_config.json` will be processed before `extra_config.json`. Configuration
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can be in either [HCL](https://github.com/hashicorp/hcl#syntax) or JSON format.
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Available in Consul 1.0 and later, the HCL support now requires an `.hcl` or
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`.json` extension on all configuration files in order to specify their format.
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Configuration specified later will be merged into configuration specified
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earlier. In most cases, "merge" means that the later version will override the
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earlier. In some cases, such as event handlers, merging appends the handlers to
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the existing configuration. The exact merging behavior is specified for each
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option below.
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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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documented below in the
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[Reloadable Configuration](#reloadable-configuration) section. The
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[reload command](/commands/reload) can also be used to trigger a
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configuration reload.
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You can test the following configuration options by following the
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[Getting Started](https://learn.hashicorp.com/tutorials/consul/get-started-install?utm_source=consul.io&utm_medium=docs)
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tutorials to install a local agent.
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## Ports Used
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Consul requires up to 6 different ports to work properly, some on
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TCP, UDP, or both protocols.
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Review the [required ports](/docs/install/ports) table for a list of
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required ports and their default settings.
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## Reloadable Configuration
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Reloading configuration does not reload all configuration items. The
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items which are reloaded include:
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- ACL Tokens
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- [Configuration Entry Bootstrap](/docs/agent/config/config-files#config_entries_bootstrap)
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- Checks
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- [Discard Check Output](/docs/agent/config/config-files#discard_check_output)
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- HTTP Client Address
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- Log level
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- [Metric Prefix Filter](/docs/agent/config/config-files#telemetry-prefix_filter)
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- [Node Metadata](/docs/agent/config/config-files#node_meta)
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- Some Raft options (since Consul 1.10.0)
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- [`raft_snapshot_threshold`](/docs/agent/config/config-files#_raft_snapshot_threshold)
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- [`raft_snapshot_interval`](/docs/agent/config/config-files#_raft_snapshot_interval)
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- [`raft_trailing_logs`](/docs/agent/config/config-files#_raft_trailing_logs)
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- These can be important in certain outage situations so being able to control
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them without a restart provides a recovery path that doesn't involve
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downtime. They generally shouldn't be changed otherwise.
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- [RPC rate limiting](/docs/agent/config/config-files#limits)
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- [HTTP Maximum Connections per Client](/docs/agent/config/config-files#http_max_conns_per_client)
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- Services
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- TLS Configuration
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- Please be aware that this is currently limited to reload a configuration that is already TLS enabled. You cannot enable or disable TLS only with reloading.
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- Watches
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<!-- list of reference-style links -->
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[go-sockaddr]: https://godoc.org/github.com/hashicorp/go-sockaddr/template
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