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README.md
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README.md
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kubernetes-ansible
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========
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Install and configure a kubernetes cluster including network plugin and optionnal addons.
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Based on [CiscoCloud](https://github.com/CiscoCloud/kubernetes-ansible) work.
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Install and configure a kubernetes cluster including network plugin.
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### Requirements
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Tested on **Debian Jessie** and **Ubuntu** (14.10, 15.04, 15.10).
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* The target servers must have access to the Internet in order to pull docker imaqes.
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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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* the following packages are required: openssl, curl, dnsmasq, python-httplib2 on remote servers and python-ipaddr on deployment machine.
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Ansible v1.9.x
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### Components
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* [kubernetes](https://github.com/kubernetes/kubernetes/releases) v1.1.3
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* [etcd](https://github.com/coreos/etcd/releases) v2.2.2
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* [calicoctl](https://github.com/projectcalico/calico-docker/releases) v0.12.0
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* [calicoctl](https://github.com/projectcalico/calico-docker/releases) v0.13.0
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* [flanneld](https://github.com/coreos/flannel/releases) v0.5.5
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* [docker](https://www.docker.com/) v1.9.1
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Run the playbook
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```
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ansible-playbook -i environments/test/inventory cluster.yml -u root
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ansible-playbook -i inventory/inventory.cfg cluster.yml -u root
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```
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You can jump directly to "*Available apps, installation procedure*"
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@ -65,7 +63,7 @@ Please ensure that you have enough disk space there (about **300M**).
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### Variables
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The main variables to change are located in the directory ```environments/[env_name]/group_vars/k8s-cluster.yml```.
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The main variables to change are located in the directory ```inventory/group_vars/all.yml```.
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### Inventory
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Below is an example of an inventory.
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It is possible to define variables for different environments.
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For instance, in order to deploy the cluster on 'dev' environment run the following command.
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```
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ansible-playbook -i environments/dev/inventory cluster.yml -u root
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ansible-playbook -i inventory/dev/inventory.cfg cluster.yml -u root
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```
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Kubernetes
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* Almost all kubernetes components are running into pods except *kubelet*. These pods are managed by kubelet which ensure they're always running
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* One etcd cluster member per node will be configured. For safety reasons, you should have at least two master nodes.
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* For safety reasons, you should have at least two master nodes and 3 etcd servers
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* Kube-proxy doesn't support multiple apiservers on startup ([#18174]('https://github.com/kubernetes/kubernetes/issues/18174')). An external loadbalancer needs to be configured.
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* Kube-proxy doesn't support multiple apiservers on startup ([Issue 18174]('https://github.com/kubernetes/kubernetes/issues/18174')). An external loadbalancer needs to be configured.
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In order to do so, some variables have to be used '**loadbalancer_apiserver**' and '**apiserver_loadbalancer_domain_name**'
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### Expose a service
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There are several loadbalancing solutions.
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The ones i found suitable for kubernetes are [Vulcand]('http://vulcand.io/') and [Haproxy]('http://www.haproxy.org/')
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The one i found suitable for kubernetes are [Vulcand]('http://vulcand.io/') and [Haproxy]('http://www.haproxy.org/')
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My cluster is working with haproxy and kubernetes services are configured with the loadbalancing type '**nodePort**'.
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eg: each node opens the same tcp port and forwards the traffic to the target pod wherever it is located.
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### Check cluster status
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#### Kubernetes components
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Master processes : kube-apiserver, kube-scheduler, kube-controller, kube-proxy
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Nodes processes : kubelet, kube-proxy, [calico-node|flanneld]
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* Check the status of the processes
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```
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systemctl status [process_name]
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systemctl status kubelet
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```
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* Check the logs
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```
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journalctl -ae -u [process_name]
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journalctl -ae -u kubelet
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```
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* Check the NAT rules
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iptables -nLv -t nat
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```
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For the master nodes you'll have to see the docker logs for the apiserver
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```
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docker logs [apiserver docker id]
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```
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### Available apps, installation procedure
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