0c7e1889e4
This allows `kube_apiserver_insecure_port` to be set to 0 (disabled). It's working, but so far I have had to: 1. Make the `uri` module "Wait for apiserver up" checks use `kube_apiserver_port` (HTTPS) 2. Add apiserver client cert/key to the "Wait for apiserver up" checks 3. Update apiserver liveness probe to use HTTPS ports 4. Set `kube_api_anonymous_auth` to true to allow liveness probe to hit apiserver's /healthz over HTTPS (livenessProbes can't use client cert/key unfortunately) 5. RBAC has to be enabled. Anonymous requests are in the `system:unauthenticated` group which is granted access to /healthz by one of RBAC's default ClusterRoleBindings. An equivalent ABAC rule could allow this as well. Changes 1 and 2 should work for everyone, but 3, 4, and 5 require new coupling of currently independent configuration settings. So I also added a new settings check. Options: 1. The problem goes away if you have both anonymous-auth and RBAC enabled. This is how kubeadm does it. This may be the best way to go since RBAC is already on by default but anonymous auth is not. 2. Include conditional templates to set a different liveness probe for possible combinations of `kube_apiserver_insecure_port = 0`, RBAC, and `kube_api_anonymous_auth` (won't be possible to cover every case without a guaranteed authorizer for the secure port) 3. Use basic auth headers for the liveness probe (I really don't like this, it adds a new dependency on basic auth which I'd also like to leave independently configurable, and it requires encoded passwords in the apiserver manifest) Option 1 seems like the clear winner to me, but is there a reason we wouldn't want anonymous-auth on by default? The apiserver binary defaults anonymous-auth to true, but kubespray's default was false. |
||
|---|---|---|
| .github | ||
| contrib | ||
| docs | ||
| extra_playbooks | ||
| inventory | ||
| library | ||
| roles | ||
| scripts | ||
| tests | ||
| .gitignore | ||
| .gitlab-ci.yml | ||
| .gitmodules | ||
| .yamllint | ||
| ansible.cfg | ||
| cluster.yml | ||
| code-of-conduct.md | ||
| CONTRIBUTING.md | ||
| LICENSE | ||
| OWNERS | ||
| README.md | ||
| RELEASE.md | ||
| requirements.txt | ||
| reset.yml | ||
| scale.yml | ||
| setup.cfg | ||
| setup.py | ||
| upgrade-cluster.yml | ||
| Vagrantfile | ||
Deploy a production ready kubernetes cluster
If you have questions, join us on the kubernetes slack, channel #kubespray.
- Can be deployed on AWS, GCE, Azure, OpenStack or Baremetal
- High available cluster
- Composable (Choice of the network plugin for instance)
- Support most popular Linux distributions
- Continuous integration tests
To deploy the cluster you can use :
kubespray-cli
Ansible usual commands and inventory builder
vagrant by simply running vagrant up (for tests purposes)
- Requirements
- Kubespray vs ...
- Getting started
- Ansible inventory and tags
- Integration with existing ansible repo
- Deployment data variables
- DNS stack
- HA mode
- Network plugins
- Vagrant install
- CoreOS bootstrap
- Debian Jessie setup
- Downloaded artifacts
- Cloud providers
- OpenStack
- AWS
- Azure
- vSphere
- Large deployments
- Upgrades basics
- Roadmap
Supported Linux distributions
- Container Linux by CoreOS
- Debian Jessie
- Ubuntu 16.04
- CentOS/RHEL 7
Note: Upstart/SysV init based OS types are not supported.
Versions of supported components
kubernetes v1.8.2
etcd v3.2.4
flanneld v0.8.0
calico v2.5.0
canal (given calico/flannel versions)
weave v2.0.1
docker v1.13 (see note)
rkt v1.21.0 (see Note 2)
Note: kubernetes doesn't support newer docker versions. Among other things kubelet currently breaks on docker's non-standard version numbering (it no longer uses semantic versioning). To ensure auto-updates don't break your cluster look into e.g. yum versionlock plugin or apt pin).
Note 2: rkt support as docker alternative is limited to control plane (etcd and kubelet). Docker is still used for Kubernetes cluster workloads and network plugins' related OS services. Also note, only one of the supported network plugins can be deployed for a given single cluster.
Requirements
- Ansible v2.4 (or newer) and python-netaddr is installed on the machine that will run Ansible commands
- Jinja 2.9 (or newer) is required to run the Ansible Playbooks
- The target servers must have access to the Internet in order to pull docker images.
- The target servers are configured to allow IPv4 forwarding.
- Your ssh key must be copied to all the servers part of your inventory.
- The firewalls are not managed, you'll need to implement your own rules the way you used to. in order to avoid any issue during deployment you should disable your firewall.
Network plugins
You can choose between 4 network plugins. (default: calico, except Vagrant uses flannel)
-
flannel: gre/vxlan (layer 2) networking.
-
calico: bgp (layer 3) networking.
-
canal: a composition of calico and flannel plugins.
-
weave: Weave is a lightweight container overlay network that doesn't require an external K/V database cluster.
(Please refer toweavetroubleshooting documentation).
The choice is defined with the variable kube_network_plugin. There is also an
option to leverage built-in cloud provider networking instead.
See also Network checker.
Community docs and resources
- kubernetes.io/docs/getting-started-guides/kubespray/
- kubespray, monitoring and logging by @gregbkr
- Deploy Kubernetes w/ Ansible & Terraform by @rsmitty
- Deploy a Kubernetes Cluster with Kubespray (video)
Tools and projects on top of Kubespray
CI Tests
CI/end-to-end tests sponsored by Google (GCE), DigitalOcean, teuto.net (openstack). See the test matrix for details.