====== Basic installation ======
On Centos7, RPMs are from Ceontos7 extras repository
1 master, 2 nodes
== RPM verisons ==
* On master:
* kubernetes-master, kubernetes-client - 1.5.2-0.2.gitc55cf2b.el7
* etc - 3.1.0-2.el7
* flannel - 0.7.0-1.el7
* On nodes:
* kubernetes-client, kubernetes-node - 1.5.2-0.2.gitc55cf2b.el7
== Hostnames, IP, subnets, IP ranges ==
* master and node IPs
* master: node-1(192.168.50.101/24, IP address is on eth1)
* nodes: node2(192.168.50.102/24), node-3(192.168.50.103/24), IP Address are on eth1
* kubernetes cluster IP range: 10.254.0.0/16
* flannel: iface on eth1, range: 172.30.0.0/16, subnetLen:24, type: vxlan
== Ports ==
* etcd: 2379
* kube-apiserver: 8080
* kubelet: 10250
*
== Services ==
* On master:
* etcd
* kube-apiserver
* kube-controller-manager
* kube-scheduler
* flanneld
* On nodes:
* kubelet
* kube-proxy
* flanneld
== configuration files ==
* /etc/etcd/etcd.conf
ETCD_NAME=default
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_CLIENT_URLS="http://localhost:2379,http://node-1:2379"
ETCD_ADVERTISE_CLIENT_URLS="http://localhost:2379,http://node-1:2379"
* /etc/kubernetes/config - for both master and node
KUBE_LOGTOSTDERR="--logtostderr=true"
KUBE_LOG_LEVEL="--v=0"
KUBE_ALLOW_PRIV="--allow-privileged=false"
KUBE_MASTER="--master=http://node-1:8080"
* /etc/kubernetes/apiserver
KUBE_API_ADDRESS="--insecure-bind-address=0.0.0.0"
KUBE_ETCD_SERVERS="--etcd-servers=http://node-1:2379"
KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.254.0.0/16"
KUBE_API_ARGS=""
KUBE_API_PORT="--port=8080"
KUBELET_PORT="--kubelet-port=10250"
* /etc/controller-manager
KUBE_CONTROLLER_MANAGER_ARGS=""
* /etc/scheduler
KUBE_SCHEDULER_ARGS=""
* /etc/kubernetes/kubelet
KUBELET_ADDRESS="--address=0.0.0.0"
KUBELET_HOSTNAME="--hostname-override=node-2"
KUBELET_API_SERVER="--api-servers=http://node-1:8080"
KUBELET_ARGS=""
KUBELET_PORT="--port=10250"
* /etc/kubernetes/proxy
KUBE_PROXY_ARGS=""
* /etc/sysconfig/flanneld
FLANNEL_ETCD_ENDPOINTS="http://node-1:2379"
FLANNEL_ETCD_PREFIX="/kube-centos/network"
FLANNEL_OPTIONS="-iface=eth1"
* manual step to configure flannel with etcd
# systemctl start etcd
# etcdctl mkdir /kube-centos/network
# etcdctl mk /kube-centos/network/config "{ \"Network\": \"172.30.0.0/16\", \"SubnetLen\": 24, \"Backend\": { \"Type\": \"vxlan\" } }"
== service processes ==
* master
/usr/bin/etcd --name=default --data-dir=/var/lib/etcd/default.etcd --listen-client-urls=http://localhost:2379,http://node-1:2379
usr/bin/kube-apiserver --logtostderr=true --v=0 --etcd-servers=http://node-1:2379 --insecure-bind-address=0.0.0.0 --port=8080 --kubelet-port=10250 --allow-privileged=false --service-cluster-ip-range=10.254.0.0/16
/usr/bin/kube-controller-manager --logtostderr=true --v=0 --master=http://node-1:8080
/usr/bin/kube-scheduler --logtostderr=true --v=0 --master=http://node-1:8080
/usr/bin/flanneld -etcd-endpoints=http://node-1:2379 -etcd-prefix=/kube-centos/network -iface=eth1
* nodes
/usr/bin/kubelet --logtostderr=true --v=0 --api-servers=http://node-1:8080 --address=0.0.0.0 --port=10250 --hostname-override=node-2 --allow-privileged=false
/usr/bin/kube-proxy --logtostderr=true --v=0 --master=http://node-1:8080
/usr/bin/flanneld -etcd-endpoints=http://node-1:2379 -etcd-prefix=/kube-centos/network -iface=eth1
== First pod - Hello Kubernetes! ==
$ kubectl run node-hello --image=gcr.io/google-samples/node-hello:1.0 --port=8080
$ kubectl get deploy
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
node-hello 1 1 1 1 1h
$ kubectl get po
NAME READY STATUS RESTARTS AGE
node-hello-3526609615-fqf4k 1/1 Running 0 1h
$ kubectl expose deploy/node-hello --type=NodePort
service "node-hello" exposed
$ kubectl get svc -l run=node-hello
NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
hello-node 10.254.139.8 8080:30881/TCP 11s
$ kubectl get po -l run=node-hello -o wide
NAME READY STATUS RESTARTS AGE IP NODE
node-hello-3526609615-fqf4k 1/1 Running 0 1h 172.30.5.2 node-3
$ curl http://node-3:30881
Hello Kubernetes!
$ curl http://node-2:30881
Hello Kubernetes!
== 2nd pod with replicas ==
$ kubectl run kubernetes-bootcamp --image=jocatalin/kubernetes-bootcamp:v1 --port=8080
deployment "kubernetes-bootcamp" created
$ kubectl get deploy
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
kubernetes-bootcamp 1 1 1 1 16s
$ kubectl get po
NAME READY STATUS RESTARTS AGE
kubernetes-bootcamp-2019480069-jtswf 1/1 Running 0 18s
$ kubectl expose deploy/kubernetes-bootcamp --type=NodePort
service "kubernetes-bootcamp" exposed
$ kubectl get svc
NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes 10.254.0.1 443/TCP 1h
kubernetes-bootcamp 10.254.195.177 8080:32693/TCP 13s
$ kubectl get po -o wide
NAME READY STATUS RESTARTS AGE IP NODE
kubernetes-bootcamp-2019480069-jtswf 1/1 Running 0 1m 172.30.93.2 node-2
$ curl http://node-2:32693
Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-2019480069-jtswf | v=1
$ curl http://node-2:32693
Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-2019480069-jtswf | v=1
$ kubectl logs kubernetes-bootcamp-2019480069-jtswf
Kubernetes Bootcamp App Started At: 2017-04-04T19:45:42.811Z | Running On: kubernetes-bootcamp-2019480069-jtswf
Running On: kubernetes-bootcamp-2019480069-jtswf | Total Requests: 1 | App Uptime: 112.899 seconds | Log Time: 2017-04-04T19:47:35.710Z
Running On: kubernetes-bootcamp-2019480069-jtswf | Total Requests: 2 | App Uptime: 127.612 seconds | Log Time: 2017-04-04T19:47:50.423Z
$ kubectl scale deploy/kubernetes-bootcamp --replicas=4
deployment "kubernetes-bootcamp" scaled
$ kubectl get po -o wide
NAME READY STATUS RESTARTS AGE IP NODE
kubernetes-bootcamp-2019480069-220qd 1/1 Running 0 57m 172.30.5.3 node-3
kubernetes-bootcamp-2019480069-ftzgl 1/1 Running 0 57m 172.30.5.2 node-3
kubernetes-bootcamp-2019480069-jtswf 1/1 Running 0 59m 172.30.93.2 node-2
kubernetes-bootcamp-2019480069-k0gkq 1/1 Running 0 57m 172.30.93.3 node-2
$ curl http://node-2:32693
Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-2019480069-ftzgl | v=1
$ curl http://node-3:32693
Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-2019480069-220qd | v=1
$ curl http://node-3:32693
Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-2019480069-k0gkq | v=1
$ curl http://node-2:32693
Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-2019480069-jtswf | v=1