217 lines
11 KiB
Markdown
217 lines
11 KiB
Markdown
# Deploy a Production Ready Kubernetes Cluster
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If you have questions, check the documentation at [kubespray.io](https://kubespray.io) and join us on the [kubernetes slack](https://kubernetes.slack.com), channel **\#kubespray**.
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You can get your invite [here](http://slack.k8s.io/)
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- Can be deployed on **AWS, GCE, Azure, OpenStack, vSphere, Packet (bare metal), Oracle Cloud Infrastructure (Experimental), or Baremetal**
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- **Highly available** cluster
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- **Composable** (Choice of the network plugin for instance)
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- Supports most popular **Linux distributions**
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- **Continuous integration tests**
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## Quick Start
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To deploy the cluster you can use :
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### Ansible
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#### Usage
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```ShellSession
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# Install dependencies from ``requirements.txt``
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sudo pip3 install -r requirements.txt
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# Copy ``inventory/sample`` as ``inventory/mycluster``
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cp -rfp inventory/sample inventory/mycluster
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# Update Ansible inventory file with inventory builder
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declare -a IPS=(10.10.1.3 10.10.1.4 10.10.1.5)
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CONFIG_FILE=inventory/mycluster/hosts.yaml python3 contrib/inventory_builder/inventory.py ${IPS[@]}
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# Review and change parameters under ``inventory/mycluster/group_vars``
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cat inventory/mycluster/group_vars/all/all.yml
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cat inventory/mycluster/group_vars/k8s-cluster/k8s-cluster.yml
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# Deploy Kubespray with Ansible Playbook - run the playbook as root
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# The option `--become` is required, as for example writing SSL keys in /etc/,
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# installing packages and interacting with various systemd daemons.
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# Without --become the playbook will fail to run!
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ansible-playbook -i inventory/mycluster/hosts.yaml --become --become-user=root cluster.yml
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```
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Note: When Ansible is already installed via system packages on the control machine, other python packages installed via `sudo pip install -r requirements.txt` will go to a different directory tree (e.g. `/usr/local/lib/python2.7/dist-packages` on Ubuntu) from Ansible's (e.g. `/usr/lib/python2.7/dist-packages/ansible` still on Ubuntu).
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As a consequence, `ansible-playbook` command will fail with:
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```raw
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ERROR! no action detected in task. This often indicates a misspelled module name, or incorrect module path.
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```
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probably pointing on a task depending on a module present in requirements.txt (i.e. "unseal vault").
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One way of solving this would be to uninstall the Ansible package and then, to install it via pip but it is not always possible.
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A workaround consists of setting `ANSIBLE_LIBRARY` and `ANSIBLE_MODULE_UTILS` environment variables respectively to the `ansible/modules` and `ansible/module_utils` subdirectories of pip packages installation location, which can be found in the Location field of the output of `pip show [package]` before executing `ansible-playbook`.
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### Vagrant
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For Vagrant we need to install python dependencies for provisioning tasks.
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Check if Python and pip are installed:
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```ShellSession
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python -V && pip -V
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```
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If this returns the version of the software, you're good to go. If not, download and install Python from here <https://www.python.org/downloads/source/>
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Install the necessary requirements
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```ShellSession
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sudo pip install -r requirements.txt
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vagrant up
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```
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## Documents
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- [Requirements](#requirements)
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- [Kubespray vs ...](docs/comparisons.md)
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- [Getting started](docs/getting-started.md)
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- [Ansible inventory and tags](docs/ansible.md)
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- [Integration with existing ansible repo](docs/integration.md)
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- [Deployment data variables](docs/vars.md)
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- [DNS stack](docs/dns-stack.md)
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- [HA mode](docs/ha-mode.md)
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- [Network plugins](#network-plugins)
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- [Vagrant install](docs/vagrant.md)
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- [CoreOS bootstrap](docs/coreos.md)
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- [Fedora CoreOS bootstrap](docs/fcos.md)
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- [Debian Jessie setup](docs/debian.md)
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- [openSUSE setup](docs/opensuse.md)
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- [Downloaded artifacts](docs/downloads.md)
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- [Cloud providers](docs/cloud.md)
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- [OpenStack](docs/openstack.md)
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- [AWS](docs/aws.md)
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- [Azure](docs/azure.md)
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- [vSphere](docs/vsphere.md)
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- [Packet Host](docs/packet.md)
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- [Large deployments](docs/large-deployments.md)
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- [Adding/replacing a node](docs/nodes.md)
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- [Upgrades basics](docs/upgrades.md)
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- [Air-Gap installation](docs/offline-environment.md)
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- [Roadmap](docs/roadmap.md)
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## Supported Linux Distributions
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- **Container Linux by CoreOS**
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- **Debian** Buster, Jessie, Stretch, Wheezy
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- **Ubuntu** 16.04, 18.04, 20.04
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- **CentOS/RHEL** 7, 8 (experimental: see [centos 8 notes](docs/centos8.md))
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- **Fedora** 30, 31
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- **Fedora CoreOS** (experimental: see [fcos Note](docs/fcos.md))
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- **openSUSE** Leap 42.3/Tumbleweed
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- **Oracle Linux** 7, 8 (experimental: [centos 8 notes](docs/centos8.md) apply)
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Note: Upstart/SysV init based OS types are not supported.
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## Supported Components
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- Core
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- [kubernetes](https://github.com/kubernetes/kubernetes) v1.18.5
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- [etcd](https://github.com/coreos/etcd) v3.3.12
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- [docker](https://www.docker.com/) v19.03 (see note)
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- [containerd](https://containerd.io/) v1.2.13
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- [cri-o](http://cri-o.io/) v1.17 (experimental: see [CRI-O Note](docs/cri-o.md). Only on fedora, ubuntu and centos based OS)
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- Network Plugin
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- [cni-plugins](https://github.com/containernetworking/plugins) v0.8.6
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- [calico](https://github.com/projectcalico/calico) v3.15.0
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- [canal](https://github.com/projectcalico/canal) (given calico/flannel versions)
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- [cilium](https://github.com/cilium/cilium) v1.8.0
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- [contiv](https://github.com/contiv/install) v1.2.1
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- [flanneld](https://github.com/coreos/flannel) v0.12.0
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- [kube-ovn](https://github.com/alauda/kube-ovn) v1.2.1
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- [kube-router](https://github.com/cloudnativelabs/kube-router) v1.0.0
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- [multus](https://github.com/intel/multus-cni) v3.4.2
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- [weave](https://github.com/weaveworks/weave) v2.6.5
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- Application
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- [cephfs-provisioner](https://github.com/kubernetes-incubator/external-storage) v2.1.0-k8s1.11
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- [rbd-provisioner](https://github.com/kubernetes-incubator/external-storage) v2.1.1-k8s1.11
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- [cert-manager](https://github.com/jetstack/cert-manager) v0.11.1
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- [coredns](https://github.com/coredns/coredns) v1.6.7
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- [ingress-nginx](https://github.com/kubernetes/ingress-nginx) v0.32.0
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Note: The list of validated [docker versions](https://kubernetes.io/docs/setup/production-environment/container-runtimes/#docker) is 1.13.1, 17.03, 17.06, 17.09, 18.06, 18.09 and 19.03. The recommended docker version is 19.03. The kubelet might break 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).
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## Requirements
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- **Minimum required version of Kubernetes is v1.16**
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- **Ansible v2.9+, Jinja 2.11+ and python-netaddr is installed on the machine that will run Ansible commands**
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- The target servers must have **access to the Internet** in order to pull docker images. Otherwise, additional configuration is required (See [Offline Environment](docs/offline-environment.md))
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- The target servers are configured to allow **IPv4 forwarding**.
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- **Your ssh key must be copied** to all the servers part of your inventory.
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- The **firewalls are not managed**, you'll need to implement your own rules the way you used to.
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in order to avoid any issue during deployment you should disable your firewall.
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- If kubespray is ran from non-root user account, correct privilege escalation method
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should be configured in the target servers. Then the `ansible_become` flag
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or command parameters `--become or -b` should be specified.
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Hardware:
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These limits are safe guarded by Kubespray. Actual requirements for your workload can differ. For a sizing guide go to the [Building Large Clusters](https://kubernetes.io/docs/setup/cluster-large/#size-of-master-and-master-components) guide.
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- Master
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- Memory: 1500 MB
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- Node
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- Memory: 1024 MB
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## Network Plugins
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You can choose between 10 network plugins. (default: `calico`, except Vagrant uses `flannel`)
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- [flannel](docs/flannel.md): gre/vxlan (layer 2) networking.
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- [Calico](https://docs.projectcalico.org/latest/introduction/) is a networking and network policy provider. Calico supports a flexible set of networking options
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designed to give you the most efficient networking across a range of situations, including non-overlay
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and overlay networks, with or without BGP. Calico uses the same engine to enforce network policy for hosts,
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pods, and (if using Istio and Envoy) applications at the service mesh layer.
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- [canal](https://github.com/projectcalico/canal): a composition of calico and flannel plugins.
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- [cilium](http://docs.cilium.io/en/latest/): layer 3/4 networking (as well as layer 7 to protect and secure application protocols), supports dynamic insertion of BPF bytecode into the Linux kernel to implement security services, networking and visibility logic.
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- [contiv](docs/contiv.md): supports vlan, vxlan, bgp and Cisco SDN networking. This plugin is able to
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apply firewall policies, segregate containers in multiple network and bridging pods onto physical networks.
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- [weave](docs/weave.md): Weave is a lightweight container overlay network that doesn't require an external K/V database cluster.
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(Please refer to `weave` [troubleshooting documentation](https://www.weave.works/docs/net/latest/troubleshooting/)).
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- [kube-ovn](docs/kube-ovn.md): Kube-OVN integrates the OVN-based Network Virtualization with Kubernetes. It offers an advanced Container Network Fabric for Enterprises.
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- [kube-router](docs/kube-router.md): Kube-router is a L3 CNI for Kubernetes networking aiming to provide operational
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simplicity and high performance: it uses IPVS to provide Kube Services Proxy (if setup to replace kube-proxy),
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iptables for network policies, and BGP for ods L3 networking (with optionally BGP peering with out-of-cluster BGP peers).
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It can also optionally advertise routes to Kubernetes cluster Pods CIDRs, ClusterIPs, ExternalIPs and LoadBalancerIPs.
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- [macvlan](docs/macvlan.md): Macvlan is a Linux network driver. Pods have their own unique Mac and Ip address, connected directly the physical (layer 2) network.
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- [multus](docs/multus.md): Multus is a meta CNI plugin that provides multiple network interface support to pods. For each interface Multus delegates CNI calls to secondary CNI plugins such as Calico, macvlan, etc.
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The choice is defined with the variable `kube_network_plugin`. There is also an
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option to leverage built-in cloud provider networking instead.
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See also [Network checker](docs/netcheck.md).
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## Community docs and resources
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- [kubernetes.io/docs/setup/production-environment/tools/kubespray/](https://kubernetes.io/docs/setup/production-environment/tools/kubespray/)
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- [kubespray, monitoring and logging](https://github.com/gregbkr/kubernetes-kargo-logging-monitoring) by @gregbkr
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- [Deploy Kubernetes w/ Ansible & Terraform](https://rsmitty.github.io/Terraform-Ansible-Kubernetes/) by @rsmitty
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- [Deploy a Kubernetes Cluster with Kubespray (video)](https://www.youtube.com/watch?v=CJ5G4GpqDy0)
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## Tools and projects on top of Kubespray
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- [Digital Rebar Provision](https://github.com/digitalrebar/provision/blob/v4/doc/integrations/ansible.rst)
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- [Terraform Contrib](https://github.com/kubernetes-sigs/kubespray/tree/master/contrib/terraform)
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## CI Tests
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[](https://gitlab.com/kargo-ci/kubernetes-sigs-kubespray/pipelines)
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CI/end-to-end tests sponsored by Google (GCE)
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See the [test matrix](docs/test_cases.md) for details.
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