![]() ![]() If it doesn't connect, then check that the pod is running and that the ssh-lb service is routing to it.LB_HOSTNAME is from the sshd-lb Service as described above. Test that the K8s service is reachable using regular ssh. Once the service is running, users can connect and start accessing services inside the cluster over SSH using sshuttle. The example configuration provided here assumes a single service for the cluster that's being shared across multiple users. Note that if you want more isolation between users, you can also run multiple independent sshd instances, each with their own LoadBalancers. Kubectl get service sshd-lb -o jsonpath='' This endpoint should be provided to any users that want to connect to the service: If you're running on a cloud K8s instance, the sshd-lb Service should automatically configure a LoadBalancer endpoint where the service can be reached. ![]() Start the provided example sshd pod/service in the cluster:.Per above, editing this later requires restarting the sshd-0 pod. Each key should be entered one per line, as is standard for authorized_keys. Add any per-user/machine public keys to the authorized_keys entry in the sshd ConfigMap.This will briefly disconnect any active sessions. You will need to restart the pod to pick up the config changes using e.g. This is a standard caveat with ConfigMaps. ![]() Note that if you edit the sshd ConfigMap after the sshd-0 pod has already started, the change will NOT take effect automatically. The keys themselves are not especially sensitive but it wouldn't hurt to keep them relatively private. in git, so that the server can quickly be brought back in the event of e.g. You should keep a copy of your ConfigMap safe somewhere, e.g. The all public keys to be granted access to the tunnel should be included in the authorized_keys entry of the sshd ConfigMap. ) should have a separate key pair to allow easy revocation as machines are decommissioned and/or reformatted. If the public key file does not exist yet, users can create a new key pair using ssh-keygen. ed25519) should work too but haven't been tested. The content should be a single line like ssh-rsa AAAAATwk= They should NOT provide their private key, which is multiple lines long. Any users who should have tunnel access to the cluster need to have their SSH public key added to the sshd authorized_keys file.Įnd users who wish to use the tunnel service should provide the content of their ~/.ssh/id_rsa.pub public key.The sshd service needs to be deployed into the cluster, and access from outside the cluster needs to be enabled using e.g.There are two aspects of setting up access: Users meanwhile must have ssh and sshuttle, the latter of which will handle tunnelling traffic from the local workstation over an SSH connection to the cluster. An example LoadBalancer Service is included to provide this access in cloud environments. The container shouldn't require any special privileges beyond being reachable from outside the cluster. The only modification is to also install python3 as required by sshuttle. Within the cluster, we are just running a stock build of openssh-server provided here. The configuration provided here is meant to be an example that can be copied and edited separately, in particular around populating authorized_keys for users/machines that need tunnel access, and/or customizing the ingress method for reaching the service, with this example including a LoadBalancer service for cloud clusters. Meanwhile, sshuttle automatically handles DNS and routing into the cluster from a workstation, making it easy to access in-cluster resources while sshuttle runs in the background. ![]() This method works like any other SSH connection to a regular machine, making it easy to get started for users that are accustomed to using SSH. This example shows how to tunnel into a Kubernetes cluster using an SSH service running in a pod on the server, and sshuttle on the client/workstation. #Kubernetes tunnel via openssh and sshuttle ![]()
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