I'm new to Kubernetes so I encountered the following issue. These are my steps:
1) I ran etcd:
docker run --volume=/var/etcd:/var/etcd --net=host -d gcr.io/google_containers/etcd:2.0.12 /usr/local/bin/etcd --addr=127.0.0.1:4001 --bind-addr=0.0.0.0:4001 --data-dir=/var/etcd/data
2) I ran the master container:
docker run \
--volume=/:/rootfs:ro \
--volume=/sys:/sys:ro \
--volume=/dev:/dev \
--volume=/var/lib/docker/:/var/lib/docker:ro \
--volume=/var/lib/kubelet/:/var/lib/kubelet:rw \
--volume=/var/run:/var/run:rw \
--net=host \
--pid=host \
--privileged=true \
-d gcr.io/google_containers/hyperkube:v1.0.1 \
/hyperkube kubelet --containerized --hostname-override="127.0.0.1" --address="0.0.0.0" --api-servers=http://localhost:8080 --config=/etc/kubernetes/manifests
3) I ran the proxy:
docker run -d --net=host --privileged gcr.io/google_containers/hyperkube:v1.0.1 /hyperkube proxy --master=http://127.0.0.1:8080 --v=2
4) I installed kubectl
5) I created this simple pod-file.yml:
apiVersion: v1
kind: Pod
metadata:
name: two-containers
spec:
restartPolicy: Never
volumes:
- name: shared-data
emptyDir: {}
containers:
- name: nginx-container
image: nginx
volumeMounts:
- name: shared-data
mountPath: /usr/share/nginx/html
- name: debian-container
image: debian
volumeMounts:
- name: shared-data
mountPath: /pod-data
command: ["/bin/sh"]
args: ["-c", "echo Hello from the debian container > /pod-data/index.html"]
and tried to create pod by running:
kubectl create -f pod-file.yml
And I got:
ubuntu@ubuntu:~$ kubectl create -f pod-file.yml
error: could not read an encoded object from pod-file.yml: unable to connect to a server to handle "pods": couldn't read version from server: Get http://localhost:8080/api: dial tcp 127.0.0.1:8080: connection refused
I found it pretty odd so I checked containers I ran earlier:
ubuntu@ubuntu:~$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
3ae7f094bb01 gcr.io/google_containers/hyperkube:v1.0.1 "/hyperkube proxy ..." 55 minutes ago Up 55 minutes suspicious_ramanujan
ed841bc6ef26 gcr.io/google_containers/hyperkube:v1.0.1 "/hyperkube kubele..." 57 minutes ago Up 57 minutes competent_mclean
7408c640a2c8 gcr.io/google_containers/etcd:2.0.12 "/usr/local/bin/et..." About an hour ago Up About an hour elated_shaw
So looks like all is ok because all containers are up and running. Okay, I checked open ports in my system (ubuntu 16.04):
ubuntu@ubuntu:~$ sudo netstat -nautp
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1315/sshd
tcp 0 0 127.0.0.1:7001 0.0.0.0:* LISTEN 3209/etcd
tcp 0 0 127.0.0.1:10248 0.0.0.0:* LISTEN 3324/hyperkube
tcp 0 0 127.0.0.1:10249 0.0.0.0:* LISTEN 3399/hyperkube
tcp 0 0 127.0.0.1:2380 0.0.0.0:* LISTEN 3209/etcd
tcp 0 524 172.30.3.114:22 212.98.179.158:35900 ESTABLISHED 3087/sshd: ubuntu [
tcp6 0 0 :::10255 :::* LISTEN 3324/hyperkube
tcp6 0 0 :::22 :::* LISTEN 1315/sshd
tcp6 0 0 :::4001 :::* LISTEN 3209/etcd
tcp6 0 0 :::10250 :::* LISTEN 3324/hyperkube
udp 0 0 0.0.0.0:68 0.0.0.0:* 959/dhclient
udp 0 0 0.0.0.0:68 0.0.0.0:* 796/dhclient
And I found that there is no 8080 open TCP port that kubectl tried to reach. So this is the cause of my issue.
So my question is what container/service/daemon I should run/launch to open this port and to assign web service to it in order to let kubectl use it for this GET request http://localhost:8080/api?
Any help would be appreciated.
Creating a kubernetes cluster from scratch is a little more complicated. The master kubelet runs a number of pods to make it all go.
If you're looking for an all in one solution use minikube to run in a VM. Otherwise use kubeadm to setup your master and work back from there if you want to see how each component is setup.