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When the update process completes. This option helps us to setup the consul cluster without manually doing everything on our own.The consul template is to be formed at /tmp/.conf.tmpfl. The language in which the template is written according to Hashicorp Configuration Language (HCL).You can download the consul-template from this page.Try it out by using the following command −$ ./consul-template -hThe output would be as shown in the following screenshot.If you wish to move this binary to a more prominent space, so that it is available for the user every time. You can type in the following commands −$ chmod +x consul-template$ sudo mv consul-template /usr/share/bin/For demo purposes, we are going to use a sample configuration of nginx to be used as our service. You can try out more demos at or better write down your own template.$ vim /tmp/nginx.conf.ctmplThe output would be as shown in the following screenshot.The config file may look like −{{range services}} {{$name := .Name}} {{$service := service .Name}}upstream {{$name}} { zone upstream-{{$name}} 64k; {{range $service}}server {{.Address}}:{{.Port}} max_fails = 3 fail_timeout = 60 weight = 1; {{else}}server 127.0.0.1:65535; # force a 502{{end}}} {{end}}server { listen 80 default_server; location / { root /usr/share/nginx/html/; index index.html; } location /stub_status { stub_status; } {{range services}} {{$name := .Name}} location /{{$name}} { proxy_pass } {{end}}}Now using the consul template binary file, please run the following commands −$ consul-template \ -template = "/tmp/nginx.conf.ctmpl:/etc/nginx/conf.d/default.conf"With the previous command the process has started. You can later open up another terminal and view the nginx.conf file being completely rendered using the following command.$ cat /etc/nginx/conf.d/default.confThe output would be as shown in the following screenshot.

Starting Consul agent...consul[19856]: ==> Consul agent running!consul[19856]: Version: 'v1.0.5'consul[19856]: Node ID: 'xxxxxxxx-34e6-704a-xxxx-xxxxxxxxxxxx'consul[19856]: Node name: 'node.ip.domain.com'consul[19856]: Datacenter: 'sandbox' (Segment: '')consul[19856]: Server: false (Bootstrap: false)consul[19856]: Client Addr: [0.0.0.0] (HTTP: 8500, HTTPS: -1, DNS: 53)consul[19856]: Cluster Addr: 10.0.0.5 (LAN: 8301, WAN: 8302)consul[19856]: Encrypt: Gossip: true, TLS-Outgoing: true, TLS-Incoming: trueconsul[19856]: ==> Log data will now stream in as it occurs:consul[19856]: 2018/02/09 01:14:37 [INFO] serf: EventMemberJoin: node.ip.domain.com 10.0.0.5consul[19856]: 2018/02/09 01:14:37 [INFO] agent: Started DNS server 0.0.0.0:53 (tcp)consul[19856]: 2018/02/09 01:14:37 [INFO] agent: Started DNS server 0.0.0.0:53 (udp)consul[19856]: 2018/02/09 01:14:37 [INFO] agent: Started HTTP server on [::]:8500 (tcp)consul[19856]: 2018/02/09 01:14:37 [INFO] agent: started state syncerconsul[19856]: 2018/02/09 01:14:37 [INFO] agent: Retry join LAN is supported for: aliyun aws azure digitalocean gce os scaleway softlayerconsul[19856]: 2018/02/09 01:14:37 [INFO] agent: Joining LAN cluster...consul[19856]: 2018/02/09 01:14:37 [INFO] agent: (LAN) joining: [cluster.loadbalancer.local]consul[19856]: 2018/02/09 01:14:37 [WARN] manager: No servers availableconsul[19856]: 2018/02/09 01:14:37 [ERR] agent: failed to sync remote state: No known Consul serversconsul[19856]: panic: sync: negative WaitGroup counterconsul[19856]: goroutine 52 [running]:consul[19856]: sync.(*WaitGroup).Add(0xc4204000a0, 0xffffffffffffffff)consul[19856]: /goroot/src/sync/waitgroup.go:75 +0x134consul[19856]: sync.(*WaitGroup).Done(0xc4204000a0)consul[19856]: /goroot/src/sync/waitgroup.go:100 +0x34consul[19856]: github.com/hashicorp/consul/vendor/github.com/miekg/dns.(*Server).serve(0xc420400000, 0x1db8860, 0xc4204cfc80, 0x1db0da0, 0xc420150b80, 0xc420220b70, 0x2c, 0x2c, 0x0, 0x0, ...)consul[19856]: /gopath/src/github.com/hashicorp/consul/vendor/github.com/miekg/dns/server.go:611 +0x3aeconsul[19856]: github.com/hashicorp/consul/vendor/github.com/miekg/dns.(*Server).serveTCP.func1(0xc420150c10, 0x1dc3e00, 0xc42021a428, 0x77359400, 0xc420400000, 0xc420150c20)consul[19856]: /gopath/src/github.com/hashicorp/consul/vendor/github.com/miekg/dns/server.go:498 +0x141consul[19856]: created by github.com/hashicorp/consul/vendor/github.com/miekg/dns.(*Server).serveTCPconsul[19856]: /gopath/src/github.com/hashicorp/consul/vendor/github.com/miekg/dns/server.go:492 +0x2e3systemd[1]: consul.service: Main process exited, code=exited, status=2/INVALIDARGUMENT">consul[19856]: ==> Starting Consul agent...consul[19856]: ==> Consul agent running!consul[19856]: Version: 'v1.0.5'consul[19856]: Node ID: 'xxxxxxxx-34e6-704a-xxxx-xxxxxxxxxxxx'consul[19856]: Node name: 'node.ip.domain.com'consul[19856]: Datacenter: 'sandbox' (Segment: '')consul[19856]: Server: false (Bootstrap: false)consul[19856]: Client Addr: [0.0.0.0] (HTTP: 8500, HTTPS: -1, DNS: 53)consul[19856]: Cluster Addr: 10.0.0.5 (LAN: 8301, WAN: 8302)consul[19856]: Encrypt: Gossip: true, TLS-Outgoing: true, TLS-Incoming: trueconsul[19856]: ==> Log data will now stream

Consul has many integrations with Kubernetes. You can deploy Consulto Kubernetes using the Helm chart or Consul K8s CLI, sync services between Consul andKubernetes, run Consul Service Mesh, and more.This section documents the official integrations between Consul and Kubernetes.Consul Service Mesh:Consul can automatically inject the Consul Service Meshsidecar into pods so that they can accept and establish encryptedand authorized network connections with mutual TLS. And because Consul Service Meshcan run anywhere, pods and external services can communicate with each other over a fully encrypted connection.Service sync to enable Kubernetes and non-Kubernetes services to communicate:Consul can sync Kubernetes services with its own service registry. This service sync allowsKubernetes services to use Kubernetes' native service discovery capabilities to discoverand connect to external services registered in Consul, and for external servicesto use Consul service discovery to discover and connect to Kubernetes services.Additional integrations: Consul can run directly on Kubernetes, so in addition to thenative integrations provided by Consul itself, any other tool built forKubernetes can leverage Consul.There are several ways to try Consul with Kubernetes in different environments.TutorialsThe Getting Started with Consul Service Mesh trackprovides guidance for installing Consul as service mesh for Kubernetes using the Helmchart, deploying services in the service mesh, and using intentions to secure servicecommunications.The Migrate to Microservices with Consul Service Mesh on Kubernetescollection uses an example application written by a fictional company to illustrate why and how organizations canmigrate from monolith to microservices using Consul service mesh on Kubernetes. The case study in this collectionshould provide information valuable for understanding how to develop services that leverage Consul during any stageof your microservices journey.The Consul and Minikube guide is a quick step-by-step guide for deploying Consul with the official Helm chart on a local instance of Minikube.Review production best practices and cloud-specific configurations for deploying Consul on managed Kubernetes runtimes.The Consul on Azure Kubernetes Service (AKS) tutorial is a complete step-by-step guide on how to deploy Consul on AKS. The guide also allows you to practice deploying two microservices.The Consul on Amazon Elastic Kubernetes Service (EKS) tutorial is a complete step-by-step guide on how to deploy Consul on EKS. Additionally, it provides guidance on interacting with your datacenter with the Consul UI, CLI, and API.The Consul on Google Kubernetes Engine (GKE) tutorial is a complete step-by-step guide on how to deploy Consul on GKE. Additionally, it provides guidance on interacting with your datacenter with the Consul UI, CLI, and