consul/website/content/commands/config/write.mdx

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---
layout: commands
page_title: 'Commands: Config Write'
description: >-
The `consul config write` command creates or updates a configuration entry and applies it to your deployment.
---
# Consul Config Write
Command: `consul config write`
Corresponding HTTP API Endpoint: [\[PUT\] /v1/config](/consul/api-docs/config#apply-configuration)
The `config write` command creates or updates a centralized config entry.
See the [configuration entries docs](/consul/docs/agent/config-entries) for more
details about configuration entries.
The table below shows this command's [required ACLs](/consul/api-docs/api-structure#authentication). Configuration of
[blocking queries](/consul/api-docs/features/blocking) and [agent caching](/consul/api-docs/features/caching)
are not supported from commands, but may be from the corresponding HTTP endpoint.
| ACL Required<sup>1</sup> |
| ------------------------------------------------------------- |
| `service:write`<br />`operator:write`<br />`intentions:write` |
<p>
<sup>1</sup> The actual ACL required depends on the config entry kind being
updated:
</p>
| Config Entry Kind | Required ACL |
| ------------------- | ------------------ |
| api-gateway | `mesh:write` |
| ingress-gateway | `operator:write` |
| proxy-defaults | `operator:write` |
| service-defaults | `service:write` |
| service-intentions | `intentions:write` |
| service-resolver | `service:write` |
| service-router | `service:write` |
| service-splitter | `service:write` |
| terminating-gateway | `operator:write` |
## Usage
Usage: `consul config write [options] FILE`
#### Command Options
- `-cas` - Specifies to use a Check-And-Set operation. If the index is
0, Consul will only store the entry if it does not already exist. If the index is
non-zero, the entry is only set if the current index matches the `ModifyIndex`
of that entry.
#### Enterprise Options
@include 'http_api_partition_options.mdx'
@include 'http_api_namespace_options.mdx'
#### API Options
@include 'http_api_options_client.mdx'
## Examples
From file:
$ consul config write web-defaults.json
From stdin:
$ consul config write -
### Config Entry examples
All config entries must have a `Kind` when registered. See
[Service Mesh - Config Entries](/consul/docs/connect/config-entries) for the list of
supported config entries.
#### Service defaults
Service defaults control default global values for a service in the service mesh.
For example, the following configuration defines that all instances of the `web`
service use the `http` protocol.
```json
{
"Kind": "service-defaults",
"Name": "web",
"Protocol": "http"
}
```
For more information, refer to the [service defaults configuration reference](/consul/docs/connect/config-entries/service-defaults).
#### Proxy defaults
Proxy defaults lets you configure global config defaults across all proxies
in the service mesh. Currently, it supports only one global entry.
For example, the following configuration overrides a default timeout for all
Envoy proxies.
```json
{
"Kind": "proxy-defaults",
"Name": "global",
"Config": {
"local_idle_timeout_ms": 20000
}
}
```
For more information, refer to the [proxy defaults configuration reference](/consul/docs/connect/config-entries/proxy-defaults).