update submodules and documentation
Smaine Kahlouch
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README.md
87
README.md
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@ -16,8 +16,8 @@ Linux distributions tested:
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### Requirements
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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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in order to avoid any issue during deployment you should **disable your firewall**
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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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* **Copy your ssh keys** to all the servers part of your inventory.
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* **Ansible v2.x and python-netaddr**
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* Base knowledge on Ansible. Please refer to [Ansible documentation](http://www.ansible.com/how-ansible-works)
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@ -37,16 +37,20 @@ These defaults are good for tests purposes.
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Edit the inventory according to the number of servers
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```
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[kube-master]
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10.115.99.31
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node1
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node2
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[etcd]
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10.115.99.31
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10.115.99.32
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10.115.99.33
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node1
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node2
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node3
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[kube-node]
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10.115.99.32
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10.115.99.33
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node2
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node3
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node4
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node5
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node6
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[k8s-cluster:children]
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kube-node
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@ -68,37 +72,32 @@ The main variables to change are located in the directory ```inventory/group_var
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### Inventory
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Below is an example of an inventory.
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Note : The bgp vars local_as and peers are not mandatory if the var **'peer_with_router'** is set to false
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By default this variable is set to false and therefore all the nodes are configure in **'node-mesh'** mode.
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In node-mesh mode the nodes peers with all the nodes in order to exchange routes.
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```
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## Configure 'ip' variable to bind kubernetes services on a
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## different ip than the default iface
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node1 ansible_ssh_host=95.54.0.12 # ip=10.3.0.1
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node2 ansible_ssh_host=95.54.0.13 # ip=10.3.0.2
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node3 ansible_ssh_host=95.54.0.14 # ip=10.3.0.3
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node4 ansible_ssh_host=95.54.0.15 # ip=10.3.0.4
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node5 ansible_ssh_host=95.54.0.16 # ip=10.3.0.5
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node6 ansible_ssh_host=95.54.0.17 # ip=10.3.0.6
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[kube-master]
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node1 ansible_ssh_host=10.99.0.26
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node2 ansible_ssh_host=10.99.0.27
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node1
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node2
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[etcd]
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node1 ansible_ssh_host=10.99.0.26
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node2 ansible_ssh_host=10.99.0.27
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node3 ansible_ssh_host=10.99.0.4
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node1
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node2
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node3
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[kube-node]
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node2 ansible_ssh_host=10.99.0.27
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node3 ansible_ssh_host=10.99.0.4
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node4 ansible_ssh_host=10.99.0.5
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node5 ansible_ssh_host=10.99.0.36
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node6 ansible_ssh_host=10.99.0.37
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[paris]
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node1 ansible_ssh_host=10.99.0.26
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node3 ansible_ssh_host=10.99.0.4 local_as=xxxxxxxx
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node4 ansible_ssh_host=10.99.0.5 local_as=xxxxxxxx
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[new-york]
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node2 ansible_ssh_host=10.99.0.27
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node5 ansible_ssh_host=10.99.0.36 local_as=xxxxxxxx
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node6 ansible_ssh_host=10.99.0.37 local_as=xxxxxxxx
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node2
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node3
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node4
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node5
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node6
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[k8s-cluster:children]
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kube-node
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@ -138,8 +137,6 @@ Kubernetes
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* You can choose where to install the master components. If you want your master node to act both as master (api,scheduler,controller) and node (e.g. accept workloads, create pods ...),
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the server address has to be present on both groups 'kube-master' and 'kube-node'.
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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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* 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 ([Issue 18174](https://github.com/kubernetes/kubernetes/issues/18174)). An external loadbalancer needs to be configured.
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@ -155,16 +152,6 @@ You can choose between 2 network plugins. Only one must be chosen.
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The choice is defined with the variable '**kube_network_plugin**'
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### Expose a service
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There are several loadbalancing solutions.
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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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Then Haproxy can be configured to request kubernetes's api in order to loadbalance on the proper tcp port on the nodes.
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Please refer to the proper kubernetes documentation on [Services](https://github.com/kubernetes/kubernetes/blob/release-1.0/docs/user-guide/services.md)
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### Check cluster status
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@ -199,7 +186,7 @@ There are two ways of installing new apps
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Additionnal apps can be installed with ```ansible-galaxy```.
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ou'll need to edit the file '*requirements.yml*' in order to chose needed apps.
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you'll need to edit the file '*requirements.yml*' in order to chose needed apps.
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The list of available apps are available [there](https://github.com/ansibl8s)
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For instance it is **strongly recommanded** to install a dns server which resolves kubernetes service names.
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@ -268,6 +255,18 @@ calicoctl pool show
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calicoctl endpoint show --detail
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```
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##### Optionnal : BGP Peering with border routers
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In some cases you may want to route the pods subnet and so NAT is not needed on the nodes.
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For instance if you have a cluster spread on different locations and you want your pods to talk each other no matter where they are located.
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The following variables need to be set:
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**peer_with_router** enable the peering with border router of the datacenter (default value: false).
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you'll need to edit the inventory and add a and a hostvar **local_as** by node.
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```
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node1 ansible_ssh_host=95.54.0.12 local_as=xxxxxx
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```
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#### Flannel
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* Flannel configuration file should have been created there
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@ -1,39 +1,30 @@
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---
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- src: https://github.com/ansibl8s/k8s-common.git
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path: roles/apps
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version: v1.0
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- src: https://github.com/ansibl8s/k8s-kubedns.git
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path: roles/apps
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version: v1.0
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#- src: https://github.com/ansibl8s/k8s-kube-ui.git
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# path: roles/apps
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# version: v1.0
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#
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#- src: https://github.com/ansibl8s/k8s-fabric8.git
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# path: roles/apps
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# version: v1.0
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#
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#- src: https://github.com/ansibl8s/k8s-elasticsearch.git
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# path: roles/apps
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# # version: v1.0
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#
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#- src: https://github.com/ansibl8s/k8s-redis.git
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# path: roles/apps
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# # version: v1.0
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#
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#- src: https://github.com/ansibl8s/k8s-memcached.git
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# path: roles/apps
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# version: v1.0
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#
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#- src: https://github.com/ansibl8s/k8s-postgres.git
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# path: roles/apps
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# version: v1.0
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#
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#- src: https://github.com/ansibl8s/k8s-pgbouncer.git
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# path: roles/apps
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# version: v1.0
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#
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#- src: https://github.com/ansibl8s/k8s-heapster.git
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# path: roles/apps
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@ -43,3 +34,6 @@
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#
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#- src: https://github.com/ansibl8s/k8s-kubedash.git
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# path: roles/apps
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#
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#- src: https://github.com/ansibl8s/k8s-kube-logstash.git
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# path: roles/apps
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