-
Notifications
You must be signed in to change notification settings - Fork 1.9k
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
tproxy:
transparent_proxy reference docs (#20241)
Ref: #20175
- Loading branch information
Showing
5 changed files
with
229 additions
and
24 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
174 changes: 174 additions & 0 deletions
174
website/content/docs/job-specification/transparent_proxy.mdx
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,174 @@ | ||
| --- | ||
| layout: docs | ||
| page_title: transparent_proxy Block - Job Specification | ||
| description: |- | ||
| The "transparent_proxy" block allows specifying options for configuring Envoy | ||
| in Consul Connect transparent proxy mode. | ||
| --- | ||
|
|
||
| # `transparent_proxy` Block | ||
|
|
||
| <Placement | ||
| groups={[ | ||
| 'job', | ||
| 'group', | ||
| 'service', | ||
| 'connect', | ||
| 'sidecar_service', | ||
| 'proxy', | ||
| 'transparent_proxy', | ||
| ]} | ||
| /> | ||
|
|
||
| The `transparent_proxy` block configures the Envoy sidecar proxy to act as a | ||
| Consul Connect [transparent proxy][tproxy]. This simplifies the configuration of | ||
| Consul Connect by eliminating the need to configure [`upstreams`][] blocks in | ||
| Nomad. Instead, the Envoy proxy will takes its configuration entirely from | ||
| Consul [service intentions][]. | ||
|
|
||
| When transparent proxy is enabled traffic will automatically flow through the | ||
| Envoy proxy. If the local Consul agent is serving DNS, Nomad will also set up | ||
| the task's nameservers to use Consul. This lets your workload use the [virtual | ||
| IP][] DNS name from Consul, rather than configuring a `template` block that | ||
| queries services. | ||
|
|
||
| Using transparent proxy has some important restrictions: | ||
|
|
||
| * You can only have a single `connect` block in any task group that uses | ||
| transparent proxy. | ||
| * You cannot set a [`network.dns`][] block on the allocation (unless you set | ||
| [`no_dns`](#no_dns), see below). | ||
| * The node where the allocation is placed must be configured as described in | ||
| the Service Mesh integration documentation for [Transparent Proxy][]. | ||
|
|
||
| ## `transparent_proxy` Parameters | ||
|
|
||
| * `exclude_inbound_ports` `([]string: nil)` - A list of inbound ports to exclude | ||
| from the inbound traffic redirection. This allows traffic on these ports to | ||
| bypass the Envoy proxy. These ports can be specified as either [network port | ||
| labels][port_labels] or as numeric ports. Nomad will automatically add the | ||
| following to this list: | ||
| * The [`local_path_port`][] of any [`expose`][] block. | ||
| * The port of any service check with [`expose=true`][check_expose] set. | ||
| * The port of any `network.port` with a [`static`][] value. | ||
| * `exclude_outbound_cidrs` `([]string: nil)` - A list of CIDR subnets that | ||
| should be excluded from outbound traffic redirection. This allows traffic to | ||
| these subnets to bypass the Envoy proxy. Note this is independent of | ||
| `exclude_outbound_ports`; CIDR subnets listed here are excluded regardless of | ||
| the port. | ||
| * `exclude_outbound_ports` `([]int: nil)` - A list of port numbers that should | ||
| be excluded from outbound traffic redirection. This allows traffic to these | ||
| subnets to bypass the Envoy proxy. Note this is independent of | ||
| `exclude_outbound_cidrs`; ports listed here are excluded regardless of the | ||
| CIDR. | ||
| * `exclude_uids` `([]string: nil)` - A list of Unix user IDs (UIDs) that should | ||
| be excluded from outbound traffic redirection. When unset, only the Envoy | ||
| proxy's user will be allowed to bypass the iptables rule. | ||
| * `no_dns` `(bool: false)` - By default, Consul will be set as the nameserver | ||
| for the workload and IP tables rules will redirect DNS queries to Consul. If | ||
| you want only external DNS, set `no_dns=true`. You will need to add your own | ||
| CIDR and port exclusions for your DNS nameserver. You cannot set | ||
| [`network.dns`][] if `no_dns=false`. | ||
| * `outbound_port` `(int: 15001)` - The port that Envoy will bind on inside the | ||
| network namespace. The iptables rules created by `consul-cni` will force | ||
| traffic to flow to this port. You should only set this value if you have | ||
| specifically set the [`outbound_listener_port`][] in your Consul proxy | ||
| configuration. You can change the default value for a given node via [client | ||
| metadata](#client-metadata) (see below). | ||
| * `uid` `(string "101")` - The Unix user ID (UID) used by the Envoy proxy. You | ||
| should only set this value if you have a custom build of the Envoy container | ||
| image which uses a different UID. You can change the default value for a given | ||
| node via [client metadata](#client-metadata) (see below). | ||
|
|
||
| ## Client Metadata | ||
|
|
||
| You can change the default [`outbound_port`](#outbound_port) and [`uid`](#uid) | ||
| for a given client node by updating the node metadata via the [`nomad node meta | ||
| apply`][] command. The attributes that can be updated are: | ||
|
|
||
| * `connect.transparent_proxy.default_uid`: Sets the default value of | ||
| [`uid`](#uid) for this node. | ||
| * `connect.transparent_proxy.default_outbound_port`: Sets the default value of | ||
| [`outbound_port`](#outbound_port) for this node. | ||
|
|
||
| For example, to set the default value for the `uid` field to 120: | ||
|
|
||
| ```shell-session | ||
| $ nomad node meta apply connect.transparent_proxy.default_uid=120 | ||
| $ nomad node meta read -json | jq -r '.Dynamic | ."connect.transparent_proxy.default_uid"' | ||
| 120 | ||
| ``` | ||
|
|
||
| You should not normally need to set these values unless you are using custom | ||
| Envoy images. | ||
|
|
||
| ## Examples | ||
|
|
||
| ### Minimal Example | ||
|
|
||
| The following example is a minimal transparent proxy specification. Note that | ||
| with transparent proxy, you will not need to configure an `upstreams` block. | ||
|
|
||
| ```hcl | ||
| sidecar_service { | ||
| proxy { | ||
| transparent_proxy { | ||
| } | ||
| } | ||
| } | ||
| ``` | ||
|
|
||
| If you had a downstream task group `count-dashboard` that needed to connect to | ||
| an upstream task group `count-api` listening on port 9001, you could create a | ||
| Consul service intention with the following specification: | ||
|
|
||
| ```hcl | ||
| Kind = "service-intentions" | ||
| Name = "count-api" | ||
| Sources = [ | ||
| { | ||
| Name = "count-dashboard" | ||
| Action = "allow" | ||
| } | ||
| ] | ||
| ``` | ||
|
|
||
| And then the downstream service `count-dashboard` could reach the `count-api` | ||
| service by making requests to `http://count-api.virtual.consul`. | ||
|
|
||
| ### External DNS | ||
|
|
||
| The following example is a transparent proxy specification where external DNS is | ||
| used. To find the address of other allocations in this configuration, you will | ||
| need to use a [`template`][] block to query Consul. | ||
|
|
||
| ```hcl | ||
| sidecar_service { | ||
| proxy { | ||
| transparent_proxy { | ||
| excluded_outbound_ports = [53] | ||
| excluded_outbound_cidrs = ["208.67.222.222/32", "208.67.220.220/32"] | ||
| no_dns = true | ||
| } | ||
| } | ||
| } | ||
| ``` | ||
|
|
||
| [tproxy]: /consul/docs/k8s/connect/transparent-proxy | ||
| [`upstreams`]: /nomad/docs/job-specification/upstreams | ||
| [service intentions]: /consul/docs/connect/config-entries/service-intentions | ||
| [virtual IP]: /consul/docs/services/discovery/dns-static-lookups#service-virtual-ip-lookups | ||
| [`consul-cni`]: https://releases.hashicorp.com/consul-cni | ||
| [cni_plugins]: /nomad/docs/networking/cni#cni-reference-plugins | ||
| [consul_dns_port]: /consul/docs/agent/config/config-files#dns_port | ||
| [`recursors`]: /consul/docs/agent/config/config-files#recursors | ||
| [port_labels]: /nomad/docs/job-specification/network#port-parameters | ||
| [`local_path_port`]: /nomad/docs/job-specification/expose#local_path_port | ||
| [`expose`]: /nomad/docs/job-specification/expose | ||
| [check_expose]: /nomad/docs/job-specification/service#expose | ||
| [`static`]: /nomad/docs/job-specification/network#static | ||
| [`outbound_listener_port`]: /consul/docs/connect/proxies/proxy-config-reference#outbound_listener_port | ||
| [`template`]: /nomad/docs/job-specification/template#consul-integration | ||
| [`nomad node meta apply`]: /nomad/docs/commands/node/meta/apply | ||
| [`network.dns`]: /nomad/docs/job-specification/network#dns-parameters | ||
| [Transparent Proxy]: /nomad/docs/integrations/consul/service-mesh#transparent-proxy |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters