First pass at a Consul Connect example docs
This commit is contained in:
Preetha Appan
parent
53397722f1
commit
1206c895f6
|
|
@ -0,0 +1,169 @@
|
|||
---
|
||||
layout: "guides"
|
||||
page_title: "Consul Connect"
|
||||
sidebar_current: "guides-integrations-consul-connect"
|
||||
description: |-
|
||||
Learn how to use Nomad with Consul Connect to enable secure service to service communication
|
||||
---
|
||||
|
||||
# Consul Connect
|
||||
|
||||
~> **Note** This page describes a new feature available in a preview release of Nomad for Hashiconf EU 2019.
|
||||
The set of features described here are intended to ship with Nomad 0.10.
|
||||
|
||||
[Consul Connect](https://www.consul.io/docs/connect/index.html) provides service-to-service connection
|
||||
authorization and encryption using mutual Transport Layer Security (TLS). Applications can use sidecar proxies in a service mesh
|
||||
configuration to automatically establish TLS connections for inbound and outbound connections
|
||||
without being aware of Connect at all.
|
||||
|
||||
# Nomad with Consul Connect Integration
|
||||
|
||||
Nomad integrates with Consul to provide secure service-to-service communication between
|
||||
Nomad jobs and task groups. In order to support Consul Connect, Nomad adds a new networking
|
||||
mode for jobs that enables tasks in the same task group to share their networking stack. With
|
||||
a few changes to the job specification, job authors can opt into Connect integration. When Connect
|
||||
is enabled, Nomad will launch a proxy alongside the application in the job file. The proxy (Envoy)
|
||||
provides secure communication with other applications in the cluster.
|
||||
|
||||
Nomad job specification authors can use Nomad's Consul Connect integration to implement
|
||||
[service segmentation](https://www.consul.io/segmentation.html) in a
|
||||
microservice architecture running in public clouds without having to directly manage
|
||||
TLS certificates. This is transparent to job specification authors as security features
|
||||
in Connect continue to work even as the application scales up or down or gets rescheduled by Nomad.
|
||||
|
||||
# Nomad Consul Connect Example
|
||||
|
||||
The following section walks through an example to enable secure communication
|
||||
between a web application and a Redis container. The web application and
|
||||
the Redis container are managed by Nomad. Nomad additionally configures
|
||||
Envoy proxies to run along side these applications. The web application uses
|
||||
a localhost port for all Redis communication. The proxy is managed by Nomad, and
|
||||
handles mTLS communication to the Redis container.
|
||||
|
||||
## Prerequisites
|
||||
|
||||
### Consul
|
||||
|
||||
Connect requires Consul 1.6 (TODO Download link). Consul must advertise on a routable
|
||||
address. The following steps show how to start a Consul dev agent configured for Connect.
|
||||
|
||||
```sh
|
||||
$ go get -u github.com/hashicorp/go-sockaddr/cmd/sockaddr
|
||||
$ export DEFAULT_IP=$(sockaddr eval GetAllInterfaces | sort "default" | exclude "type" "IPv6" | limit 1 | attr "address")
|
||||
$ consul agent -dev -bind 0.0.0.0 -client 192.168.86.27 -advertise 192.168.86.27
|
||||
```
|
||||
|
||||
### Nomad
|
||||
|
||||
Nomad must also schedule onto a routable interface. The following steps show how to start
|
||||
a Nomad dev agent configured for Connect.
|
||||
|
||||
```sh
|
||||
$ go get -u github.com/hashicorp/go-sockaddr/cmd/sockaddr
|
||||
$ export DEFAULT_IFACE=$(sockaddr eval 'GetAllInterfaces | sort "default" | unique "name" | attr "name"')
|
||||
$ sudo nomad agent -dev -network-interface $DEFAULT_IFACE
|
||||
```
|
||||
|
||||
## Run Redis Container
|
||||
|
||||
Run the following job specification using `nomad run`. This job
|
||||
uses the `network` stanza in its task group with `bridge` networking mode.
|
||||
This enables the container to share its network namespace with other tasks in the
|
||||
same task group. The `connect` stanza enables Consul Connect functionality for this
|
||||
container. Nomad will launch a proxy for this container that registers itself in Consul.
|
||||
|
||||
```hcl
|
||||
job "redis" {
|
||||
datacenters = ["dc1"]
|
||||
|
||||
group "cache" {
|
||||
network {
|
||||
mode = "bridge"
|
||||
port "db" {
|
||||
static = 6379
|
||||
}
|
||||
}
|
||||
|
||||
service {
|
||||
name = "redis-cache"
|
||||
tags = ["global", "cache"]
|
||||
port = "db"
|
||||
|
||||
connect {
|
||||
sidecar_service { }
|
||||
}
|
||||
}
|
||||
|
||||
task "redis" {
|
||||
driver = "docker"
|
||||
|
||||
config {
|
||||
image = "redis:3.2"
|
||||
}
|
||||
|
||||
resources {
|
||||
cpu = 500
|
||||
memory = 256
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
## Run the web application
|
||||
#### TODO change the example container
|
||||
|
||||
Run the following job specification using `nomad run`. This container is a web application
|
||||
that uses Redis. It declares Redis as its upstream service through the `sidecar_service` stanza.
|
||||
It also specifies a local bind port. This is the port on which the proxy providing secure communication
|
||||
to Redis listens on.
|
||||
|
||||
```hcl
|
||||
job "api" {
|
||||
datacenters = ["dc1"]
|
||||
|
||||
group "api" {
|
||||
network {
|
||||
mode = "bridge"
|
||||
|
||||
port "http" {
|
||||
to = 8080
|
||||
static = 8080
|
||||
}
|
||||
}
|
||||
|
||||
service {
|
||||
name = "api"
|
||||
port = "http"
|
||||
|
||||
connect {
|
||||
sidecar_service {
|
||||
proxy {
|
||||
upstreams {
|
||||
destination_name = "redis-cache"
|
||||
local_bind_port = 6379
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
task "api" {
|
||||
driver = "docker"
|
||||
|
||||
config {
|
||||
image = "schmichael/rediweb:0.2"
|
||||
}
|
||||
|
||||
resources {
|
||||
cpu = 200
|
||||
memory = 100
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
After running this job, visit the Nomad UI to see the Envoy proxies managed by Nomad
|
||||
both for the web application and its upstream Redis service. The Consul UI also shows
|
||||
the registered Connect proxies.
|
||||
|
|
@ -50,6 +50,9 @@
|
|||
<li<%= sidebar_current("guides-integrations-consul") %>>
|
||||
<a href="/guides/integrations/consul-integration/index.html">Consul</a>
|
||||
</li>
|
||||
<li<%= sidebar_current("guides-integrations-consul-connect") %>>
|
||||
<a href="/guides/integrations/consul-connect/index.html">Consul Connect <sup>Beta</sup></a>
|
||||
</li>
|
||||
<li<%= sidebar_current("guides-integrations-vault") %>>
|
||||
<a href="/guides/integrations/vault-integration/index.html">Vault</a>
|
||||
</li>
|
||||
|
|
|
|||
Loading…
Reference in New Issue