Merge pull request #4491 from coolsvap/master

Added getting started guide for CentOS

docs/getting-started-guides/README.md

@@ -17,7 +17,7 @@ Bare-metal     | custom       | Ubuntu | [docs](../../docs/getting-started-guide
 Local          |              |        | [docs](../../docs/getting-started-guides/locally.md)   | Inactive                     |
 Ovirt          |              |        | [docs](../../docs/getting-started-guides/ovirt.md)     | Inactive                     |
 Rackspace      | CoreOS       | CoreOS | [docs](../../docs/getting-started-guides/rackspace.md) | Inactive                     |
-
+Bare-metal        | custom       | CentOS | [docs](../../docs/getting-started-guides/centos/centos_manual_config.md) | Community(@coolsvap)    | Uses K8s v0.9.1
 Definition of columns:
   - **IaaS Provider** is who/what provides the virtual or physical machines (nodes) that Kubernetes runs on.
   - **OS** is the base operating system of the nodes.

docs/getting-started-guides/centos/centos_manual_config.md

@@ -0,0 +1,148 @@
+ 
+##Getting started on [CentOS](http://centos.org)
+
+This is a getting started guide for CentOS.  It is a manual configuration so you understand all the underlying packages / services / ports, etc...
+
+This guide will only get ONE minion working.  Multiple minions requires a functional [networking configuration](https://github.com/GoogleCloudPlatform/kubernetes/blob/master/docs/networking.md) done outside of kubernetes.  Although the additional kubernetes configuration requirements should be obvious.
+
+The kubernetes package provides a few services: kube-apiserver, kube-scheduler, kube-controller-manager, kubelet, kube-proxy.  These services are managed by systemd and the configuration resides in a central location: /etc/kubernetes. We will break the services up between the hosts.  The first host, centos-master, will be the kubernetes master.  This host will run the kube-apiserver, kube-controller-manager, and kube-scheduler.  In addition, the master will also run _etcd_.  The remaining host, centos-minion will be the minion and run kubelet, proxy, cadvisor and docker.
+
+**System Information:**
+
+Hosts:
+```
+centos-master = 192.168.121.9
+centos-minion = 192.168.121.65
+```
+
+**Prepare the hosts:**
+    
+* Create virt7-testing repo on all hosts - centos-{master,minion} with following information.
+
+```
+[virt7-testing]
+name=virt7-testing
+baseurl=http://cbs.centos.org/repos/virt7-testing/x86_64/os/
+gpgcheck=0
+```
+
+
+* Install kubernetes on all hosts - centos-{master,minion}.  This will also pull in etcd, docker, and cadvisor.
+
+```
+yum -y install --enablerepo=virt7-testing kubernetes
+```
+
+* Add master and minion to /etc/hosts on all machines (not needed if hostnames already in DNS)
+
+```
+echo "192.168.121.9	centos-master
+192.168.121.65	centos-minion" >> /etc/hosts
+```
+
+* Edit /etc/kubernetes/config which will be the same on all hosts to contain:
+
+```
+# Comma seperated list of nodes in the etcd cluster
+KUBE_ETCD_SERVERS="--etcd_servers=http://centos-master:4001"
+
+# logging to stderr means we get it in the systemd journal
+KUBE_LOGTOSTDERR="--logtostderr=true"
+
+# journal message level, 0 is debug
+KUBE_LOG_LEVEL="--v=0"
+
+# Should this cluster be allowed to run privleged docker containers
+KUBE_ALLOW_PRIV="--allow_privileged=false"
+```
+
+* Disable the firewall on both the master and minon, as docker does not play well with other firewall rule managers
+
+```
+systemctl disable iptables-services firewalld
+systemctl stop iptables-services firewalld
+```
+
+**Configure the kubernetes services on the master.**
+
+* Edit /etc/kubernetes/apiserver to appear as such:
+
+```       
+# The address on the local server to listen to.
+KUBE_API_ADDRESS="--address=0.0.0.0"
+
+# The port on the local server to listen on.
+KUBE_API_PORT="--port=8080"
+
+# How the replication controller and scheduler find the kube-apiserver
+KUBE_MASTER="--master=http://centos-master:8080"
+
+# Port minions listen on
+KUBELET_PORT="--kubelet_port=10250"
+
+# Address range to use for services
+KUBE_SERVICE_ADDRESSES="--portal_net=10.254.0.0/16"
+
+# Add you own!
+KUBE_API_ARGS=""
+```
+
+* Edit /etc/kubernetes/controller-manager to appear as such:
+```
+# Comma seperated list of minions
+KUBELET_ADDRESSES="--machines=centos-minion"
+```
+
+* Start the appropriate services on master:
+
+```
+for SERVICES in etcd kube-apiserver kube-controller-manager kube-scheduler; do 
+	systemctl restart $SERVICES
+	systemctl enable $SERVICES
+	systemctl status $SERVICES 
+done
+```
+
+**Configure the kubernetes services on the minion.**
+
+***We need to configure the kubelet and start the kubelet and proxy***
+
+* Edit /etc/kubernetes/kubelet to appear as such:
+
+```       
+# The address for the info server to serve on
+KUBELET_ADDRESS="--address=0.0.0.0"
+
+# The port for the info server to serve on
+KUBELET_PORT="--port=10250"
+
+# You may leave this blank to use the actual hostname
+KUBELET_HOSTNAME="--hostname_override=centos-minion"
+
+# Add your own!
+KUBELET_ARGS=""
+```       
+
+* Start the appropriate services on minion (centos-minion).
+
+```
+for SERVICES in kube-proxy kubelet docker; do 
+    systemctl restart $SERVICES
+    systemctl enable $SERVICES
+    systemctl status $SERVICES 
+done
+```
+
+*You should be finished!*
+
+* Check to make sure the cluster can see the minion (on centos-master)
+
+```
+kubectl get minions
+NAME                LABELS
+centos-minion          <none>
+```
+
+**The cluster should be running! Launch a test pod.**
+
+You should have a functional cluster, check out [101](https://github.com/GoogleCloudPlatform/kubernetes/blob/master/examples/walkthrough/README.md)!