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More Detailed Readme
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galal-hussein
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README.md
164
README.md
@ -8,70 +8,104 @@ Rancher Kubernetes Engine, an extremely simple, lightning fast Kubernetes instal
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Please check the [releases](https://github.com/rancher/rke/releases/) page.
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## Requirements
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- All cluster nodes should have Docker version 1.12 installed.
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- Docker versions 1.12.6, 1.13.1, or 17.03 should be installed for Kubernetes 1.8.
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- OpenSSH 7.0+ must be installed on each node for stream local forwarding to work.
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- The SSH user used for node access must be a member of the `docker` group:
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```bash
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usermod -aG docker <user_name>
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```
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- Ports 6443, 2379, and 2380 should be opened between cluster nodes.
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## Getting Started
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## Running
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Standing up a Kubernetes is as simple as creating a `cluster.yml` configuration file and and running the command:
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```bash
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./rke up --config cluster.yml
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./rke up --config cluster.yaml
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```
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##### Full `cluster.yaml` example
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### Full `cluster.yaml` example
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You can view full sample of cluster.yml [here](https://github.com/rancher/rke/blob/master/cluster.yml).
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### Minimal `cluster.yaml` example
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```
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---
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auth:
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strategy: x509
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options:
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foo: bar
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# supported plugins are:
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# flannel
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# calico
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# canal
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network:
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plugin: flannel
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options:
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foo: bar
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nodes:
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- address: 1.1.1.1
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user: ubuntu
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role: [controlplane, etcd]
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- address: 2.2.2.2
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user: ubuntu
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role: [worker]
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- address: host1.example.com
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user: ubuntu
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role: [worker]
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hostname_override: node3
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internal_address: 192.168.1.6
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role: [controlplane,worker,etcd]
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services:
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etcd:
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image: quay.io/coreos/etcd:latest
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kube-api:
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image: rancher/k8s:v1.8.3-rancher2
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service_cluster_ip_range: 10.233.0.0/18
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extra_args:
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v: 4
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kube-controller:
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image: rancher/k8s:v1.8.3-rancher2
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cluster_cidr: 10.233.64.0/18
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service_cluster_ip_range: 10.233.0.0/18
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scheduler:
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image: rancher/k8s:v1.8.3-rancher2
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kubelet:
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image: rancher/k8s:v1.8.3-rancher2
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cluster_domain: cluster.local
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cluster_dns_server: 10.233.0.3
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infra_container_image: gcr.io/google_containers/pause-amd64:3.0
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kubeproxy:
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image: rancher/k8s:v1.8.3-rancher2
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```
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## Network Plugins
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RKE supports the following network plugins:
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- Flannel
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- Calico
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- Cannal
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- Weave
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To use specific network plugin configure `cluster.yml` to include:
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```
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network:
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plugin: flannel
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```
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### Network Options
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There are extra options that can be specified for each network plugin:
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#### Flannel
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- **flannel_image**: Flannel daemon Docker image
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- **flannel_cni_image**: Flannel CNI binary installer Docker image
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- **flannel_iface**: Interface to use for inter-host communication
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#### Calico
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- **calico_node_image**: Calico Daemon Docker image
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- **calico_cni_image**: Calico CNI binary installer Docker image
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- **calico_controllers_image**: Calico Controller Docker image
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- **calicoctl_image**: Calicoctl tool Docker image
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- **calico_cloud_provider**: Cloud provider where Calico will operate, current available value is: `aws`
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#### Cannal
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- **canal_node_image**: Cannal Node Docker image
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- **canal_cni_image**: Cannal CNI binary installer Docker image
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- **canal_flannel_image**: Cannal Flannel Docker image
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#### Weave
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- **weave_node_image**: Weave Node Docker image
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- **weave_cni_image**: Weave CNI binary installer Docker image
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## Addons
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RKE support pluggable addons on cluster bootstrap, user can specify the addon yaml in the cluster.yml file, and when running
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```
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rke up --config cluster.yml
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```
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RKE will deploy the addons yaml after the cluster starts, RKE first uploads this yaml file as a configmap in kubernetes cluster and then run a kubernetes job that mounts this config map and deploy the addons.
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> Note that RKE doesn't support yet removal of the addons, so once they are deployed the first time you can't change them using rke
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To start using addons use `addons:` option in the `cluster.yml` file for example:
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```
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# all addon manifests MUST specify a namespace
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addons: |-
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---
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apiVersion: v1
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@ -87,6 +121,64 @@ addons: |-
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- containerPort: 80
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```
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Note that we are using `|-` because the addons option is a multi line string option, where you can specify multiple yaml files and separate them with `---`
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## High Availability
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RKE is HA ready, you can specify more than one controlplane host in the `cluster.yml` file, and rke will deploy master components on all of them, the kubelets are configured to connect to `127.0.0.1:6443` by default which is the address of `nginx-proxy` service that proxy requests to all master nodes.
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to start an HA cluster, just specify more than one host with role `controlplane`, and start the cluster normally.
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## Adding/Removing Nodes
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RKE support adding/removing nodes for worker and controlplane hosts, in order to add additional nodes you will only need to update the `cluster.yml` file with additional nodes and run `rke up` with the same file.
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To remove nodes just remove them from the hosts list in the cluster configuration file `cluster.yml`, and re run `rke up` command.
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## Cluster Remove
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RKE support `rke remove` command, the command does the following:
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- Connect to each host and remove the kubernetes services deployed on it.
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- Clean each host from the directories left by the services:
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- /etc/kubernetes/ssl
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- /var/lib/etcd
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- /etc/cni
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- /opt/cni
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- /var/run/calico
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Note that this command is irreversible and will destroy the kubernetes cluster entirely.
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## Cluster Upgrade
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RKE support kubernetes cluster upgrade through changing the image version of services, in order to do that change the image option for each services, for example:
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```
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image: rancher/k8s:v1.8.2-rancher1
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```
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TO
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```
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image: rancher/k8s:v1.8.3-rancher2
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```
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And then run:
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```
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rke up --config cluster.yml
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```
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RKE will first look for the local `.kube_config_cluster.yml` and then tries to upgrade each service to the latest image.
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> Note that rollback isn't supported in RKE and may lead to unxpected results
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## RKE Config
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RKE support command `rke config` which generates a cluster config template for the user, to start using this command just write:
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```
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rke config --name mycluster.yml
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```
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RKE will ask some questions around the cluster file like number of the hosts, ips, ssh users, etc, `--empty` option will generate an empty cluster.yml file, also if you just want to print on the screen and not save it in a file you can use `--print`.
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## More details
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More information about RKE design, configuration and usage can be found in this [blog post](http://rancher.com/an-introduction-to-rke/).
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