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Merge pull request #9838 from Ranjandas/master 

Fix TLS cert creation instruction for Consul federation
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Ranjandas 2021-03-03 19:34:30 +11:00 committed by GitHub
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48
website/content/docs/k8s/installation/multi-cluster/vms-and-kubernetes.mdx
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@ -24,19 +24,19 @@ If your primary datacenter is running on Kubernetes, use the Helm config from th
Once installed, and with the `ProxyDefaults` [resource created](/docs/k8s/installation/multi-cluster/kubernetes#proxydefaults), Once installed, and with the `ProxyDefaults` [resource created](/docs/k8s/installation/multi-cluster/kubernetes#proxydefaults),
you'll need to export the following information from the primary Kubernetes cluster: you'll need to export the following information from the primary Kubernetes cluster:
1. The certificate authority cert: * The certificate authority cert:
```sh ```sh
kubectl get secrets/consul-ca-cert --template='{{index .data "tls.crt" }}' | kubectl get secrets/consul-ca-cert --template='{{index .data "tls.crt" }}' |
base64 -D > consul-agent-ca.pem base64 -D > consul-agent-ca.pem
``` ```
and the certificate authority signing key: * The certificate authority signing key:
```sh ```sh
kubectl get secrets/consul-ca-key --template='{{index .data "tls.key" }}' | kubectl get secrets/consul-ca-key --template='{{index .data "tls.key" }}' |
base64 -D > consul-agent-ca-key.pem base64 -D > consul-agent-ca-key.pem
``` ```
With the `consul-agent-ca.pem` and `consul-agent-ca-key.pem` files you can With the `consul-agent-ca.pem` and `consul-agent-ca-key.pem` files you can
create certificates for your servers and clients running on VMs that share the create certificates for your servers and clients running on VMs that share the
@ -44,18 +44,22 @@ same certificate authority as your Kubernetes servers.
You can use the `consul tls` commands to generate those certificates: You can use the `consul tls` commands to generate those certificates:
```sh ```sh
# NOTE: consul-agent-ca.pem and consul-agent-ca-key.pem must be in the current # NOTE: consul-agent-ca.pem and consul-agent-ca-key.pem must be in the current
# directory. # directory.
$ consul tls cert create -server -dc=vm-dc $ consul tls cert create -server -dc=vm-dc -node <node_name>
==> WARNING: Server Certificates grants authority to become a ==> WARNING: Server Certificates grants authority to become a
server and access all state in the cluster including root keys server and access all state in the cluster including root keys
and all ACL tokens. Do not distribute them to production hosts and all ACL tokens. Do not distribute them to production hosts
that are not server nodes. Store them as securely as CA keys. that are not server nodes. Store them as securely as CA keys.
==> Using consul-agent-ca.pem and consul-agent-ca-key.pem ==> Using consul-agent-ca.pem and consul-agent-ca-key.pem
==> Saved vm-dc-server-consul-0.pem ==> Saved vm-dc-server-consul-0.pem
==> Saved vm-dc-server-consul-0-key.pem ==> Saved vm-dc-server-consul-0-key.pem
``` ```
-> Note the `-node` option in the above command. This should be same as the node name of the [Consul Agent](https://www.consul.io/docs/agent#running-an-agent). This is a [requirement](https://www.consul.io/docs/connect/gateways/mesh-gateway/wan-federation-via-mesh-gateways#tls) for Consul Federation to work. Alternatively, if you plan to use the same certificate and key pair on all your Consul server nodes, or you don't know the nodename in advance, use `-node "*"` instead.
Not satisfying this requirement would result in the following error in the Consul Server logs:
`[ERROR] agent.server.rpc: TLS handshake failed: conn=from= error="remote error: tls: bad certificate"`
See the help for output of `consul tls cert create -h` to see more options See the help for output of `consul tls cert create -h` to see more options
for generating server certificates. for generating server certificates.