104 lines
4.1 KiB
Markdown
104 lines
4.1 KiB
Markdown
Getting started
|
|
===============
|
|
|
|
The easiest way to run the deployement is to use the **kubespray-cli** tool.
|
|
A complete documentation can be found in its [github repository](https://github.com/kubespray/kubespray-cli).
|
|
|
|
Here is a simple example on AWS:
|
|
|
|
* Create instances and generate the inventory
|
|
|
|
```
|
|
kubespray aws --instances 3
|
|
```
|
|
|
|
* Run the deployment
|
|
|
|
```
|
|
kubespray deploy --aws -u centos -n calico
|
|
```
|
|
|
|
Building your own inventory
|
|
---------------------------
|
|
|
|
Ansible inventory can be stored in 3 formats: YAML, JSON, or INI-like. There is
|
|
an example inventory located
|
|
[here](https://github.com/kubernetes-incubator/kubespray/blob/master/inventory/inventory.example).
|
|
|
|
You can use an
|
|
[inventory generator](https://github.com/kubernetes-incubator/kubespray/blob/master/contrib/inventory_builder/inventory.py)
|
|
to create or modify an Ansible inventory. Currently, it is limited in
|
|
functionality and is only use for making a basic Kubespray cluster, but it does
|
|
support creating large clusters. It now supports
|
|
separated ETCD and Kubernetes master roles from node role if the size exceeds a
|
|
certain threshold. Run inventory.py help for more information.
|
|
|
|
Example inventory generator usage:
|
|
|
|
```
|
|
cp -r inventory my_inventory
|
|
declare -a IPS=(10.10.1.3 10.10.1.4 10.10.1.5)
|
|
CONFIG_FILE=my_inventory/inventory.cfg python3 contrib/inventory_builder/inventory.py ${IPS[@]}
|
|
```
|
|
|
|
Starting custom deployment
|
|
--------------------------
|
|
|
|
Once you have an inventory, you may want to customize deployment data vars
|
|
and start the deployment:
|
|
|
|
**IMPORTANT: Edit my_inventory/groups_vars/*.yaml to override data vars**
|
|
|
|
```
|
|
ansible-playbook -i my_inventory/inventory.cfg cluster.yml -b -v \
|
|
--private-key=~/.ssh/private_key
|
|
```
|
|
|
|
See more details in the [ansible guide](ansible.md).
|
|
|
|
Adding nodes
|
|
------------
|
|
|
|
You may want to add worker nodes to your existing cluster. This can be done by re-running the `cluster.yml` playbook, or you can target the bare minimum needed to get kubelet installed on the worker and talking to your masters. This is especially helpful when doing something like autoscaling your clusters.
|
|
|
|
- Add the new worker node to your inventory under kube-node (or utilize a [dynamic inventory](https://docs.ansible.com/ansible/intro_dynamic_inventory.html)).
|
|
- Run the ansible-playbook command, substituting `scale.yml` for `cluster.yml`:
|
|
```
|
|
ansible-playbook -i my_inventory/inventory.cfg scale.yml -b -v \
|
|
--private-key=~/.ssh/private_key
|
|
```
|
|
|
|
Connecting to Kubernetes
|
|
------------------------
|
|
By default, Kubespray configures kube-master hosts with insecure access to
|
|
kube-apiserver via port 8080. A kubeconfig file is not necessary in this case,
|
|
because kubectl will use http://localhost:8080 to connect. The kubeconfig files
|
|
generated will point to localhost (on kube-masters) and kube-node hosts will
|
|
connect either to a localhost nginx proxy or to a loadbalancer if configured.
|
|
More details on this process is in the [HA guide](ha.md).
|
|
|
|
Kubespray permits connecting to the cluster remotely on any IP of any
|
|
kube-master host on port 6443 by default. However, this requires
|
|
authentication. One could generate a kubeconfig based on one installed
|
|
kube-master hosts (needs improvement) or connect with a username and password.
|
|
By default, a user with admin rights is created, named `kube`.
|
|
The password can be viewed after deployment by looking at the file
|
|
`PATH_TO_KUBESPRAY/credentials/kube_user`. This contains a randomly generated
|
|
password. If you wish to set your own password, just precreate/modify this
|
|
file yourself.
|
|
|
|
For more information on kubeconfig and accessing a Kubernetes cluster, refer to
|
|
the Kubernetes [documentation](https://kubernetes.io/docs/tasks/access-application-cluster/configure-access-multiple-clusters/).
|
|
|
|
Accessing Kubernetes Dashboard
|
|
------------------------------
|
|
|
|
If the variable `dashboard_enabled` is set (default is true), then you can
|
|
access the Kubernetes Dashboard at the following URL:
|
|
|
|
https://kube:_kube-password_@_host_:6443/ui/
|
|
|
|
To see the password, refer to the section above, titled *Connecting to
|
|
Kubernetes*. The host can be any kube-master or kube-node or loadbalancer
|
|
(when enabled).
|