Here are logs when setting up kubernetes and weave net with kubeadm.
there are three nodes, node01, node02 and node03.
OS is xenial(ubuntu 16.04)
node01 is a master.
Before setting up kubernetes with kubeadm.
at least add two vCPUs on the master.
When master had single vCPU, it failed to create a pod network(weave net) due to out of cpu as below.
I saw the following errors when the master had single vCPU.
ubuntu@node01:~$ kubectl get pods --all-namespaces
kube-system kube-dns-2924299975-htqzs 0/4 OutOfcpu 0 49m
kube-system kube-dns-2924299975-jr3f2 0/4 OutOfcpu 0 49m
All nodes are running as VMs within KVM.
node01 : vCPU*2, memory 2G, 1 NIC(ens3) 10.14.0.10
node02 : vCPU*1, memory 1G, 1 NIC(ens3) 10.14.0.11
node03 : vCPU*1, memory 1G, 1 NIC(ens3) 10.14.0.12
[ set up kubernetes with kubeadm ]
on the master, initialize kubernetes cluster.
specify --api-advertise-addresses.
In my case, it failed to create a pod network(weave net) when I did not specify this option.
ubuntu@node01:~$ sudo kubeadm init --api-advertise-addresses=10.14.0.10
<snip>
kubeadm join --token=0cfdd7.66786e47c27ec276 10.14.0.10
ubuntu@node01:~$ sudo kubectl apply -f https://git.io/weave-kube
daemonset "weave-net" created
ubuntu@node01:~$ kubectl get pods --all-namespaces
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system dummy-2088944543-4167c 1/1 Running 0 22m
kube-system etcd-node01 1/1 Running 0 20m
kube-system kube-apiserver-node01 1/1 Running 0 22m
kube-system kube-controller-manager-node01 1/1 Running 0 21m
kube-system kube-discovery-1769846148-qrrgb 1/1 Running 0 22m
kube-system kube-dns-2924299975-1jrx2 4/4 Running 0 21m
kube-system kube-proxy-6w7cv 1/1 Running 0 21m
kube-system kube-scheduler-node01 1/1 Running 0 21m
kube-system weave-net-xvr5v 2/2 Running 0 1m
on the node02, join the cluster.
root@node02:~# kubeadm join --token=0cfdd7.66786e47c27ec276 10.14.0.10
on the node03, join the cluster.
ubuntu@node03:~$ sudo kubeadm join --token=0cfdd7.66786e47c27ec276 10.14.0.10
on the master
ubuntu@node01:~$ kubectl get nodes
NAME STATUS AGE
node01 Ready,master 26m
node02 Ready 54s
node03 Ready 3s
install sample application
ubuntu@node01:~$ kubectl create namespace sock-shop
namespace "sock-shop" created
ubuntu@node01:~$ kubectl apply -n sock-shop -f "https://github.com/microservices-demo/microservices-demo/blob/master/deploy/kubernetes/complete-demo.yaml?raw=true" --validate=false
ubuntu@node01:~$ kubectl get svc -n sock-shop
NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
cart 10.100.226.122 <none> 80/TCP 2m
cart-db 10.104.2.181 <none> 27017/TCP 2m
catalogue 10.103.204.157 <none> 80/TCP 2m
catalogue-db 10.108.4.214 <none> 3306/TCP 2m
front-end 10.100.255.194 <nodes> 80:31500/TCP 2m
orders 10.109.172.211 <none> 80/TCP 2m
orders-db 10.102.129.40 <none> 27017/TCP 2m
payment 10.106.32.31 <none> 80/TCP 2m
queue-master 10.109.87.11 <none> 80/TCP 2m
rabbitmq 10.96.4.246 <none> 5672/TCP 2m
shipping 10.102.231.77 <none> 80/TCP 2m
user 10.106.4.159 <none> 80/TCP 2m
user-db 10.109.48.189 <none> 27017/TCP 2m
ubuntu@node01:~$
ubuntu@node01:~$ kubectl describe svc front-end -n sock-shop
Name: front-end
Namespace: sock-shop
Labels: name=front-end
Selector: name=front-end
Type: NodePort
IP: 10.100.255.194
Port: <unset> 80/TCP
NodePort: <unset> 31500/TCP
Endpoints: <none>
Session Affinity: None
No events.
ubuntu@node01:~$
access to http://<master ip>:31500
in my environment, master ip is 10.14.0.10
ubuntu@node01:~$ ip -4 a s
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
inet 10.14.0.10/24 brd 10.14.0.255 scope global ens3
valid_lft forever preferred_lft forever
3: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
inet 172.17.0.1/16 scope global docker0
valid_lft forever preferred_lft forever
6: weave: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1410 qdisc noqueue state UP group default qlen 1000
inet 10.32.0.1/12 scope global weave
valid_lft forever preferred_lft forever
ubuntu@node01:~$
ubuntu@node01:~$ kubectl get pods -n sock-shop
NAME READY STATUS RESTARTS AGE
cart-2630143515-bgwx2 1/1 Running 0 7m
cart-db-2053818980-11vbp 1/1 Running 0 7m
catalogue-1271079145-smcw2 1/1 Running 0 7m
catalogue-db-2196966982-kmsgt 1/1 Running 0 7m
front-end-2250085842-6qqls 1/1 Running 0 7m
orders-2938753226-nl8jg 1/1 Running 0 7m
orders-db-3277638702-svg0x 1/1 Running 0 7m
payment-2773294789-mfztx 1/1 Running 0 7m
queue-master-1190579278-wt59p 1/1 Running 0 7m
rabbitmq-3472039365-7xdll 1/1 Running 0 7m
shipping-492753731-wtmpr 1/1 Running 0 7m
user-3917232181-nhm5r 1/1 Running 0 7m
user-db-327013678-2020l 1/1 Running 0 7m
ubuntu@node01:~$
ubuntu@node01:~$ kubectl get pods -n kube-system
NAME READY STATUS RESTARTS AGE
dummy-2088944543-4167c 1/1 Running 0 40m
etcd-node01 1/1 Running 0 39m
kube-apiserver-node01 1/1 Running 0 40m
kube-controller-manager-node01 1/1 Running 0 39m
kube-discovery-1769846148-qrrgb 1/1 Running 0 40m
kube-dns-2924299975-1jrx2 4/4 Running 0 40m
kube-proxy-1z7cb 1/1 Running 0 15m
kube-proxy-6w7cv 1/1 Running 0 40m
kube-proxy-skd70 1/1 Running 0 14m
kube-scheduler-node01 1/1 Running 0 40m
weave-net-7db4l 2/2 Running 0 14m
weave-net-n6w3l 2/2 Running 1 15m
weave-net-xvr5v 2/2 Running 0 20m
ubuntu@node01:~$
[ dashboard ]
https://github.com/kubernetes/dashboard#kubernetes-dashboard
root@node01:~# kubectl create -f https://rawgit.com/kubernetes/dashboard/master/src/deploy/kubernetes-dashboard.yaml
deployment "kubernetes-dashboard" created
service "kubernetes-dashboard" created
root@node01:~#
root@node01:~# kubectl get svc --all-namespaces | grep dashboard
kube-system kubernetes-dashboard 10.111.185.63 <nodes> 80:30998/TCP 51s
root@node01:~# kubectl get svc -n kube-system kubernetes-dashboard
NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes-dashboard 10.111.185.63 <nodes> 80:30998/TCP 1m
root@node01:~#
access to dashboard
http://10.14.0.10:30998/
[ weave scope ( cloud ) ]
Get a token by creating an account at weave cloud.
root@node01:~# kubectl apply -f 'https://cloud.weave.works/launch/k8s/weavescope.yaml?service-token=<token>'
daemonset "weave-scope-agent" created
root@node01:~#
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