d81889bb41
Avoid HTTP redirects for internal site links by updating old URLs to point to the new location for the target content.
73 lines
2.5 KiB
Plaintext
73 lines
2.5 KiB
Plaintext
---
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layout: commands
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page_title: 'Commands: RTT'
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description: |
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The rtt command estimates the network round trip time between two nodes.
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---
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# Consul RTT
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Command: `consul rtt`
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Corresponding HTTP API Endpoints: [\[GET\] /v1/coordinate/datacenters](/api-docs/coordinate#read-wan-coordinates), [\[GET\] /v1/coordinate/nodes](/api-docs/coordinate#read-lan-coordinates-for-all-nodes)
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The `rtt` command estimates the network round trip time between two nodes using
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Consul's network coordinate model of the cluster.
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See the [Network Coordinates](/docs/architecture/coordinates) internals guide
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for more information on how these coordinates are computed.
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The table below shows this command's [required ACLs](/api#authentication). Configuration of
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[blocking queries](/api/features/blocking) and [agent caching](/api/features/caching)
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are not supported from commands, but may be from the corresponding HTTP endpoint.
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| ACL Required |
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| ----------------------- |
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| `node:read`<sup>1</sup> |
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<p>
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<sup>1</sup> When referencing WAN coordinates, no ACL permission is needed.
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</p>
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## Usage
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Usage: `consul rtt [options] node1 [node2]`
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At least one node name is required. If the second node name isn't given, it
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is set to the agent's node name. These are the node names as known to
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Consul as the `consul members` command would show, not IP addresses.
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#### API Options
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@include 'http_api_options_client.mdx'
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#### Command Options
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- `-wan` - Instructs the command to use WAN coordinates instead of LAN
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coordinates. By default, the two nodes are assumed to be nodes in the local
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datacenter and the LAN coordinates are used. If the -wan option is given,
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then the WAN coordinates are used, and the node names must be suffixed by a period
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and the datacenter (eg. "myserver.dc1"). It is not possible to measure between
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LAN coordinates and WAN coordinates, so both nodes must be in the same area.
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The following environment variables control accessing the HTTP server via SSL:
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- `CONSUL_HTTP_SSL` Set this to enable SSL
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- `CONSUL_HTTP_SSL_VERIFY` Set this to disable certificate checking (not recommended)
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## Output
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If coordinates are available, the command will print the estimated round trip
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time between the given nodes:
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```shell-session
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$ consul rtt n1 n2
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Estimated n1 <-> n2 rtt: 0.610 ms (using LAN coordinates)
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$ consul rtt n2 # Running from n1
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Estimated n1 <-> n2 rtt: 0.610 ms (using LAN coordinates)
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$ consul rtt -wan n1.dc1 n2.dc2
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Estimated n1.dc1 <-> n2.dc2 rtt: 1.275 ms (using WAN coordinates)
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```
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