From 1814e56bd69254a8c9477efa86753224631b4a55 Mon Sep 17 00:00:00 2001 From: Judith Malnick Date: Tue, 11 Feb 2020 11:39:44 -0800 Subject: [PATCH] docs: add f5 guide text (#6493) --- website/source/docs/guides/consul-f5.md | 327 ++++++++++++++++++++++++ 1 file changed, 327 insertions(+) create mode 100644 website/source/docs/guides/consul-f5.md diff --git a/website/source/docs/guides/consul-f5.md b/website/source/docs/guides/consul-f5.md new file mode 100644 index 0000000000..355c1e5495 --- /dev/null +++ b/website/source/docs/guides/consul-f5.md @@ -0,0 +1,327 @@ +In this guide you will use Consul to configure F5 BIG-IP nodes and server pools. +You will set up a basic F5 BIG-IP AS3 declaration that generates the load +balancer backend-server-pool configuration based on the available service +instances registered in Consul service discovery. + +## Prerequisites + +To complete this guide, you will need previous experience with F5 BIG-IP and +Consul. You can either manually deploy the necessary infrastructure, or use the +terraform demo code. + +### Watch the Video - Optional + +Consul's intetgration with F5 was demonstrated in a webinar. If you would prefer +to lear about the integration but aren't ready to try it out, you can [watch the +webinar recording +instead](https://www.hashicorp.com/resources/zero-touch-application-delivery-with-f5-big-ip-terraform-and-consul). + +### Manually deploy your infrastructure + +You should configure the following infrastructure. + +- A single Consul datacenter with server and client nodes, and the configuration +directory for Consul agents at `/etc/consul.d/`. + +- A running instance of the F5 BIG-IP platform. If you don’t already have one +you can use a [hosted AWS +instance](https://aws.amazon.com/marketplace/pp/B079C44MFH) for this guide. + +- The AS3 package version 3.7.0 +[installed](https://clouddocs.f5.com/products/extensions/f5-appsvcs-extension/latest/userguide/installation.html) +on your F5 BIG-IP platform. + +- Standard web server running on a node, listening on HTTP port 80. We will use +NGINX in this guide. + +### Deploy a demo using Terraform - Optional + +You can set up the prerequisites on your own, or use the terraform +configuration in [this +repository](https://github.com/hashicorp/f5-terraform-consul-sd-webinar) to set +up a testing environment. + +Once your environment is set up, you'll be able to visit the F5 GUI at +`:8443/tmui/login.jsp` where `` is the address provided in your +Terraform output. Login with the username `admin` and the password from your +Terraform output. + +### Verify your environment + +Check your environment to ensure you have a healthy Consul datacenter by +checking your datacenter members. You can do this by running the `consul +members` command on the machine where Consul is running, or by accessing the +Consul web UI at the IP address of your consul instances, on port 8500. + +```shell +$ consul memberss +Node Address Status Type Build Protocol DC Segment +consul 10.0.0.100:8301 alive server 1.5.3 2 dc1 +nginx 10.0.0.109:8301 alive client 1.5.3 2 dc1 +``` + +In this sample environment we have one Consul server node, and one web server +node with a Consul client. + +## Register a Web Service + +To register the web service on one of your client nodes with Consul, create a +service definition in Consul's config directory `/etc/consul.d/` named +`nginx-service.json`. Paste in the following configuration, which includes a tcp +check for the web server so that Consul can monitor its health. + +```json +{ + "service": { + "name": "nginx", + "port": 80, + "checks": [ + { + "id": "nginx", + "name": "nginx TCP Check", + "tcp": "localhost:80", + "interval": "5s", + "timeout": "1s" + } + ] + } +} +``` + +Reload the client to read the new service definition. + +```shell +$ consul reload +``` + +In a broswer window, visit the services page of the Consul web UI at +`:8500/ui/dc1/services/nginx`. + +![Consul UI with NGINX registered](/static/img/consul-f5-nginx.png 'Consul web +UI with a healthy NGINX service') + +You should notice your instance of the nginx service listed and healthy. + +## Apply an AS3 Declaration + +Next you will configure BIG-IP to use Consul Service discovery with an AS3 +declaration. You will use cURL to apply the declaration to the BIG-IP Instance. + +First construct an authorization header to authenticate our API call with +BIG-IP. You will need to use a username and password for your instance. Below is +an example for username “admin”, and password “password”. + +```shell +$ echo -n 'admin:password' | base64 +YWRtaW46YWRtaW4= +``` + +Now use cURL to send the authorized declaration to the BIG-IP Instance. Use the +value you created above for your BIG-IP instance in the authorization header. +Remember t o replace `` with the real IP address. + +```shell +$ curl -X POST \ + https:///mgmt/shared/appsvcs/declare \ + -H 'authorization: Basic ' \ + -d '{ + "class": "ADC", + "schemaVersion": "3.7.0", + "id": "Consul_SD", + "controls": { + "class": "Controls", + "trace": true, + "logLevel": "debug" + }, + "Consul_SD": { + "class": "Tenant", + "Nginx": { + "class": "Application", + "template": "http", + "serviceMain": { + "class": "Service_HTTP", + "virtualPort": 8080, + "virtualAddresses": [ + "" + ], + "pool": "web_pool" + }, + "web_pool": { + "class": "Pool", + "monitors": [ + "http" + ], + "members": [ + { + "servicePort": 80, + "addressDiscovery": "consul", + "updateInterval": 5, + "uri": "http://:8500/v1/catalog/service/nginx" + } + ] + } + } + } +} +' +``` + +You should get a similar output to the following after you’ve applied your +declaration. + +```json +{ + "results": [ + { + "message": "success", + "lineCount": 26, + "code": 200, + "host": "localhost", + "tenant": "Consul_SD", + "runTime": 3939 + } + ], + "declaration": { + "class": "ADC", + "schemaVersion": "3.7.0", + "id": "Consul_SD", + "controls": { + "class": "Controls", + "trace": true, + "logLevel": "debug", + "archiveTimestamp": "2019-09-06T03:12:06.641Z" + }, + "Consul_SD": { + "class": "Tenant", + "Nginx": { + "class": "Application", + "template": "http", + "serviceMain": { + "class": "Service_HTTP", + "virtualPort": 8080, + "virtualAddresses": [ + "10.0.0.200" + ], + "pool": "web_pool" + }, + "web_pool": { + "class": "Pool", + "monitors": [ + "http" + ], + "members": [ + { + "servicePort": 80, + "addressDiscovery": "consul", + "updateInterval": 5, + "uri": "http://10.0.0.100:8500/v1/catalog/service/nginx" + } + ] + } + } + }, + "updateMode": "selective" + } +} +``` + +The above declaration does the following: + +- Creates a partition (tenant) named `Consul_SD`. + +- Defines a virtual server named `serviceMain` in `Consul_SD` partition with: + + - A pool named web_pool monitored by the http health monitor. + + - NGINX Pool members autodiscovered via Consul's [catalog HTTP API + endpoint](https://www.consul.io/api/catalog.html#list-nodes-for-service). + For the `virtualAddresses` make sure to substitute your BIG-IP Virtual + Server. + + - A URI specific to your Consul environment for the scheme, host, and port of + your consul address discovery. This could be a single server, load balanced + endpoint, or co-located agent, depending on your requirements. Make sure to + replace the `uri` in your configuration with the IP of your Consul client. + +You can find more information on Consul SD declarations in [F5’s Consul service +discovery +documentation](https://clouddocs.f5.com/products/extensions/f5-appsvcs-extension/latest/declarations/discovery.html#service-discovery-using-hashicorp-consul) + +You can read more about composing AS3 declarations in the [F5 documentation](https://clouddocs.f5.com/products/extensions/f5-appsvcs-extension/latest/userguide/composing-a-declaration.html). The Terraform provider for BIG-IP [also supports AS3 resources](https://www.terraform.io/docs/providers/bigip/r/bigip_as3.html). + +## Verify BIG-IP Consul Communication + +Use the `consul monitor` command on the consul agent specified in the AS3 URI to +verify that you are receiving catalog requests from the BIG-IP instance. + +```sh +$ consul monitor -log-level=debug +2019/09/06 03:16:50 [DEBUG] http: Request GET /v1/catalog/service/nginx (103.796µs) from=10.0.0.200:29487 +2019/09/06 03:16:55 [DEBUG] http: Request GET /v1/catalog/service/nginx (104.95µs) from=10.0.0.200:42079 +2019/09/06 03:17:00 [DEBUG] http: Request GET /v1/catalog/service/nginx (98.652µs) from=10.0.0.200:45536 +2019/09/06 03:17:05 [DEBUG] http: Request GET /v1/catalog/service/nginx (101.242µs) from=10.0.0.200:45940 +``` + +Check that the interval matches the value you supplied in your AS3 declaration. + +## Verify the BIG-IP Dynamic Pool + +Check the network map of the BIG-IP instance to make sure that the NGINX +instances registered in Consul are also in your BIG-IP dynamic pool. + +To check the network map, open a browser window and navigate to +`https:///tmui/tmui/locallb/network_map/app/?xui=false#!/?p=Consul_SD`. +Remember to replace the IP address. + +![NGINX instances in BIG-IP](/static/img/consul-f5-partition.png 'NGINX +instances listed in the BIG-IP web graphical user interface') + +You can read more about the network map in the [F5 +documentation](https://support.f5.com/csp/article/K20448153#accessing%20map). + +## Test the BIG-IP Virtual Server + +Now that you have a healthy virtual service, you can use it to access your web +server. + +```shell +$ curl :8080 + + + +Welcome to nginx! + + + +

Welcome to nginx!

+

If you see this page, the nginx web server is successfully installed and +working. Further configuration is required.

+ +

For online documentation and support please refer to +nginx.org.
+Commercial support is available at +nginx.com.

+ +

Thank you for using nginx.

+ + +``` +## Summary + +The F5 BIG-IP AS3 service discovery integration with Consul queries Consul's +catalog on a regular, configurable basis to get updates about changes for a +given service, and adjusts the node pools dynamically without operator +intervention. + +In this guide you configured an F5 BIG-IP instance to natively integrate with +Consul for service discovery. You were able to monitor dynamic node registration +for a web server pool member, and test it with a virtual server. + +As a follow up, you can add or reemove web server nodes reegistered with Consul +and validate that the network map on the F5 BIG-IP updates automatically.