Kubernetes 104: Create a 2-node k3s cluster with k3sup
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Create a 2-node k3s cluster with k3sup
Kubenetes-Worker = 192.168.17.6
k3sup machine = 192.168.1.131
!!! Allow ssh access between k3sup & two nodes of kubernetes
and between two nodes of kubernetes.
!!! Install K3SUP:
[root@devops ~]# curl -sLSf https://get.k3sup.dev | sh
which: no k3sup in (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin)
x86_64
Downloading package https://github.com/alexellis/k3sup/releases/download/0.3.0/k3sup as /tmp/k3sup
Download complete.
Running as root - Attempting to move k3sup to /usr/local/bin
New version of k3sup installed to /usr/local/bin
_ _____
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| < ___) \__ \ |_| | |_) |
|_|\_\____/|___/\__,_| .__/
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Version: 0.3.0
Git Commit: 7d954414def98c52ae1f6de08ac5317e4260e673
[root@devops ~]#
!!! Install kubernetes master:
[root@devops ~]# export SERVER_IP=192.168.17.5
[root@devops ~]# k3sup install --ip $SERVER_IP --user root --local-path=./kubeconfig
Public IP: 192.168.17.5
ssh -i /root/.ssh/id_rsa root@192.168.17.5
ssh: curl -sLS https://get.k3s.io | INSTALL_K3S_EXEC='server --tls-san 192.168.17.5 ' INSTALL_K3S_VERSION='v0.8.1' sh -
[INFO] Using v0.8.1 as release
[INFO] Downloading hash https://github.com/rancher/k3s/releases/download/v0.8.1/sha256sum-amd64.txt
[INFO] Downloading binary https://github.com/rancher/k3s/releases/download/v0.8.1/k3s
[INFO] Verifying binary download
[INFO] Installing k3s to /usr/local/bin/k3s
which: no kubectl in (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin)
[INFO] Creating /usr/local/bin/kubectl symlink to k3s
which: no crictl in (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin)
[INFO] Creating /usr/local/bin/crictl symlink to k3s
which: no ctr in (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin)
[INFO] Creating /usr/local/bin/ctr symlink to k3s
[INFO] Creating killall script /usr/local/bin/k3s-killall.sh
[INFO] Creating uninstall script /usr/local/bin/k3s-uninstall.sh
[INFO] env: Creating environment file /etc/systemd/system/k3s.service.env
[INFO] systemd: Creating service file /etc/systemd/system/k3s.service
[INFO] systemd: Enabling k3s unit
Created symlink from /etc/systemd/system/multi-user.target.wants/k3s.service to /etc/systemd/system/k3s.service.
[INFO] systemd: Starting k3s
Result: [INFO] Using v0.8.1 as release
[INFO] Downloading hash https://github.com/rancher/k3s/releases/download/v0.8.1/sha256sum-amd64.txt
[INFO] Downloading binary https://github.com/rancher/k3s/releases/download/v0.8.1/k3s
[INFO] Verifying binary download
[INFO] Installing k3s to /usr/local/bin/k3s
[INFO] Creating /usr/local/bin/kubectl symlink to k3s
[INFO] Creating /usr/local/bin/crictl symlink to k3s
[INFO] Creating /usr/local/bin/ctr symlink to k3s
[INFO] Creating killall script /usr/local/bin/k3s-killall.sh
[INFO] Creating uninstall script /usr/local/bin/k3s-uninstall.sh
[INFO] env: Creating environment file /etc/systemd/system/k3s.service.env
[INFO] systemd: Creating service file /etc/systemd/system/k3s.service
[INFO] systemd: Enabling k3s unit
[INFO] systemd: Starting k3s
which: no kubectl in (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin)
which: no crictl in (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin)
which: no ctr in (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin)
Created symlink from /etc/systemd/system/multi-user.target.wants/k3s.service to /etc/systemd/system/k3s.service.
ssh: sudo cat /etc/rancher/k3s/k3s.yaml
apiVersion: v1
clusters:
- cluster:
certificate-authority-data: LS0tLS1CRUdJTiBDRVJUSUZJQ0FURS0tLS0tCk1JSUJWakNCL3FBREFnRUNBZ0VBTUFvR0NDcUdTTTQ5QkFNQ01DTXhJVEFmQmdOVkJBTU1HR3N6Y3kxelpYSjIKWlhJdFkyRkFNVFUyT1RNeU9EZ3dNekFlRncweE9UQTVNalF4TWpRd01ETmFGdzB5T1RBNU1qRXhNalF3TUROYQpNQ014SVRBZkJnTlZCQU1NR0dzemN5MXpaWEoyWlhJdFkyRkFNVFUyT1RNeU9EZ3dNekJaTUJNR0J5cUdTTTQ5CkFnRUdDQ3FHU000OUF3RUhBMElBQkRtcGlrR2hoN0ZtbGNzdUljbzM3L2hUSzRvS3lFZ0ttQjlxYkREMjI3NTYKREc1Mmd5TTBWbXhGV1M0VGpjcXR6ODYvZ1FXcEdzN2FTRWc3N3FjaTBrbWpJekFoTUE0R0ExVWREd0VCL3dRRQpBd0lDcERBUEJnTlZIUk1CQWY4RUJUQURBUUgvTUFvR0NDcUdTTTQ5QkFNQ0EwY0FNRVFDSUREOFJUcXd0ZTVaCjRWUDc5WFJjczlWam5sSi9VNVR5M2I4K1U3ZDV4SWtYQWlCMnlXdnVPSnYrazZMSzk3Qk5lWklSZklRdmZEanMKalJCUDBGNkZhZHB6dUE9PQotLS0tLUVORCBDRVJUSUZJQ0FURS0tLS0tCg==
server: https://localhost:6443
name: default
contexts:
- context:
cluster: default
user: default
name: default
current-context: default
kind: Config
preferences: {}
users:
- name: default
user:
password: 78b9464990a98098c4de1696f5396bfe
username: admin
Result: apiVersion: v1
clusters:
- cluster:
certificate-authority-data: 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
server: https://localhost:6443
name: default
contexts:
- context:
cluster: default
user: default
name: default
current-context: default
kind: Config
preferences: {}
users:
- name: default
user:
password: 78b9464990a98098c4de1696f5396bfe
username: admin
Saving file to: /root/kubeconfig
[root@kmaster ~]# kubectl get node -o wide
NAME STATUS ROLES AGE VERSION INTERNAL-IP EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME
kmaster.cloud.local Ready master 22m v1.14.6-k3s.1 192.168.17.5 <none> CentOS Linux 7 (Core) 3.10.0-957.el7.x86_64 containerd://1.2.7-k3s1
!!! Install Kubernetes-Worker:
[root@devops ~]# export SERVER_IP=192.168.17.5
[root@devops ~]# export IP=192.168.17.6
[root@devops ~]# k3sup join --ip $IP --server-ip $SERVER_IP --user root
Server IP: 192.168.17.5
ssh -i /root/.ssh/id_rsa root@192.168.17.5
ssh: sudo cat /var/lib/rancher/k3s/server/node-token
K10f70feca0aba40bd0bf3cc10e9d3875e1360891bc7e86ab741d4bfb87b1240856::node:16d985abeafbe567c71ea382c39972a4
ssh: curl -sfL https://get.k3s.io/ | K3S_URL='https://192.168.17.5:6443' K3S_TOKEN='K10f70feca0aba40bd0bf3cc10e9d3875e1360891bc7e86ab741d4bfb87b1240856::node:16d985abeafbe567c71ea382c39972a4' INSTALL_K3S_VERSION='v0.8.1' sh -s -
[INFO] Using v0.8.1 as release
[INFO] Downloading hash https://github.com/rancher/k3s/releases/download/v0.8.1/sha256sum-amd64.txt
[INFO] Downloading binary https://github.com/rancher/k3s/releases/download/v0.8.1/k3s
[INFO] Verifying binary download
[INFO] Installing k3s to /usr/local/bin/k3s
which: no kubectl in (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin)
[INFO] Creating /usr/local/bin/kubectl symlink to k3s
which: no crictl in (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin)
[INFO] Creating /usr/local/bin/crictl symlink to k3s
which: no ctr in (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin)
[INFO] Creating /usr/local/bin/ctr symlink to k3s
[INFO] Creating killall script /usr/local/bin/k3s-killall.sh
[INFO] Creating uninstall script /usr/local/bin/k3s-agent-uninstall.sh
[INFO] env: Creating environment file /etc/systemd/system/k3s-agent.service.env
[INFO] systemd: Creating service file /etc/systemd/system/k3s-agent.service
[INFO] systemd: Enabling k3s-agent unit
Created symlink from /etc/systemd/system/multi-user.target.wants/k3s-agent.service to /etc/systemd/system/k3s-agent.service.
[INFO] systemd: Starting k3s-agent
Logs: which: no kubectl in (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin)
which: no crictl in (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin)
which: no ctr in (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin)
Created symlink from /etc/systemd/system/multi-user.target.wants/k3s-agent.service to /etc/systemd/system/k3s-agent.service.
Output: [INFO] Using v0.8.1 as release
[INFO] Downloading hash https://github.com/rancher/k3s/releases/download/v0.8.1/sha256sum-amd64.txt
[INFO] Downloading binary https://github.com/rancher/k3s/releases/download/v0.8.1/k3s
[INFO] Verifying binary download
[INFO] Installing k3s to /usr/local/bin/k3s
[INFO] Creating /usr/local/bin/kubectl symlink to k3s
[INFO] Creating /usr/local/bin/crictl symlink to k3s
[INFO] Creating /usr/local/bin/ctr symlink to k3s
[INFO] Creating killall script /usr/local/bin/k3s-killall.sh
[INFO] Creating uninstall script /usr/local/bin/k3s-agent-uninstall.sh
[INFO] env: Creating environment file /etc/systemd/system/k3s-agent.service.env
[INFO] systemd: Creating service file /etc/systemd/system/k3s-agent.service
[INFO] systemd: Enabling k3s-agent unit
[INFO] systemd: Starting k3s-agent
[root@kmaster ~]# kubectl get node -o wide
NAME STATUS ROLES AGE VERSION INTERNAL-IP EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME
kmaster.cloud.local Ready master 22m v1.14.6-k3s.1 192.168.17.5 <none> CentOS Linux 7 (Core) 3.10.0-957.el7.x86_64 containerd://1.2.7-k3s1
kworker.cloud.local Ready worker 78s v1.14.6-k3s.1 192.168.17.6 <none> CentOS Linux 7 (Core) 3.10.0-957.el7.x86_64 containerd://1.2.7-k3s1
[root@kmaster ~]# kubectl describe node/kmaster.cloud.local
Name: kmaster.cloud.local
Roles: master
Labels: beta.kubernetes.io/arch=amd64
beta.kubernetes.io/os=linux
kubernetes.io/arch=amd64
kubernetes.io/hostname=kmaster.cloud.local
kubernetes.io/os=linux
node-role.kubernetes.io/master=true
Annotations: flannel.alpha.coreos.com/backend-data: {"VtepMAC":"36:97:5d:52:bb:9c"}
flannel.alpha.coreos.com/backend-type: vxlan
flannel.alpha.coreos.com/kube-subnet-manager: true
flannel.alpha.coreos.com/public-ip: 192.168.17.5
node.alpha.kubernetes.io/ttl: 0
volumes.kubernetes.io/controller-managed-attach-detach: true
CreationTimestamp: Tue, 24 Sep 2019 14:40:16 +0200
Taints: <none>
Unschedulable: false
Conditions:
Type Status LastHeartbeatTime LastTransitionTime Reason Message
---- ------ ----------------- ------------------ ------ -------
MemoryPressure False Tue, 24 Sep 2019 15:52:21 +0200 Tue, 24 Sep 2019 14:40:16 +0200 KubeletHasSufficientMemory kubelet has sufficient memory available
DiskPressure False Tue, 24 Sep 2019 15:52:21 +0200 Tue, 24 Sep 2019 14:40:16 +0200 KubeletHasNoDiskPressure kubelet has no disk pressure
PIDPressure False Tue, 24 Sep 2019 15:52:21 +0200 Tue, 24 Sep 2019 14:40:16 +0200 KubeletHasSufficientPID kubelet has sufficient PID available
Ready True Tue, 24 Sep 2019 15:52:21 +0200 Tue, 24 Sep 2019 14:40:27 +0200 KubeletReady kubelet is posting ready status
Addresses:
InternalIP: 192.168.17.5
Hostname: kmaster.cloud.local
Capacity:
cpu: 4
ephemeral-storage: 28289540Ki
hugepages-1Gi: 0
hugepages-2Mi: 0
memory: 2028116Ki
pods: 110
Allocatable:
cpu: 4
ephemeral-storage: 27520064491
hugepages-1Gi: 0
hugepages-2Mi: 0
memory: 2028116Ki
pods: 110
System Info:
Machine ID: 0b3a215670b149d5ae1a28a8c5df288a
System UUID: 564D4823-4C94-50D2-A918-F7800144496D
Boot ID: ecdda590-74c1-4a82-8404-d8b87523a0e6
Kernel Version: 3.10.0-957.el7.x86_64
OS Image: CentOS Linux 7 (Core)
Operating System: linux
Architecture: amd64
Container Runtime Version: containerd://1.2.7-k3s1
Kubelet Version: v1.14.6-k3s.1
Kube-Proxy Version: v1.14.6-k3s.1
PodCIDR: 10.42.0.0/24
Non-terminated Pods: (3 in total)
Namespace Name CPU Requests CPU Limits Memory Requests Memory Limits AGE
--------- ---- ------------ ---------- --------------- ------------- ---
kube-system coredns-b7464766c-wvvhb 100m (2%) 0 (0%) 70Mi (3%) 170Mi (8%) 72m
kube-system svclb-traefik-m57hg 0 (0%) 0 (0%) 0 (0%) 0 (0%) 69m
kube-system traefik-5c79b789c5-2p4cj 0 (0%) 0 (0%) 0 (0%) 0 (0%) 69m
Allocated resources:
(Total limits may be over 100 percent, i.e., overcommitted.)
Resource Requests Limits
-------- -------- ------
cpu 100m (2%) 0 (0%)
memory 70Mi (3%) 170Mi (8%)
ephemeral-storage 0 (0%) 0 (0%)
Events: <none>
[root@kmaster ~]# kubectl describe node/kworker.cloud.local
Name: kworker.cloud.local
Roles: worker
Labels: beta.kubernetes.io/arch=amd64
beta.kubernetes.io/os=linux
kubernetes.io/arch=amd64
kubernetes.io/hostname=kworker.cloud.local
kubernetes.io/os=linux
node-role.kubernetes.io/worker=true
Annotations: flannel.alpha.coreos.com/backend-data: {"VtepMAC":"2e:87:2e:3b:b5:88"}
flannel.alpha.coreos.com/backend-type: vxlan
flannel.alpha.coreos.com/kube-subnet-manager: true
flannel.alpha.coreos.com/public-ip: 192.168.17.6
node.alpha.kubernetes.io/ttl: 0
volumes.kubernetes.io/controller-managed-attach-detach: true
CreationTimestamp: Tue, 24 Sep 2019 15:01:37 +0200
Taints: <none>
Unschedulable: false
Conditions:
Type Status LastHeartbeatTime LastTransitionTime Reason Message
---- ------ ----------------- ------------------ ------ -------
MemoryPressure False Tue, 24 Sep 2019 15:50:23 +0200 Tue, 24 Sep 2019 15:01:36 +0200 KubeletHasSufficientMemory kubelet has sufficient memory available
DiskPressure False Tue, 24 Sep 2019 15:50:23 +0200 Tue, 24 Sep 2019 15:01:36 +0200 KubeletHasNoDiskPressure kubelet has no disk pressure
PIDPressure False Tue, 24 Sep 2019 15:50:23 +0200 Tue, 24 Sep 2019 15:01:36 +0200 KubeletHasSufficientPID kubelet has sufficient PID available
Ready True Tue, 24 Sep 2019 15:50:23 +0200 Tue, 24 Sep 2019 15:01:44 +0200 KubeletReady kubelet is posting ready status
Addresses:
InternalIP: 192.168.17.6
Hostname: kworker.cloud.local
Capacity:
cpu: 4
ephemeral-storage: 28289540Ki
hugepages-1Gi: 0
hugepages-2Mi: 0
memory: 2028116Ki
pods: 110
Allocatable:
cpu: 4
ephemeral-storage: 27520064491
hugepages-1Gi: 0
hugepages-2Mi: 0
memory: 2028116Ki
pods: 110
System Info:
Machine ID: 0b3a215670b149d5ae1a28a8c5df288a
System UUID: 564D33F6-0D86-737F-8876-CF8AD085B4BC
Boot ID: 999322f6-fa6e-4b61-85e7-5f72fe999d19
Kernel Version: 3.10.0-957.el7.x86_64
OS Image: CentOS Linux 7 (Core)
Operating System: linux
Architecture: amd64
Container Runtime Version: containerd://1.2.7-k3s1
Kubelet Version: v1.14.6-k3s.1
Kube-Proxy Version: v1.14.6-k3s.1
PodCIDR: 10.42.1.0/24
Non-terminated Pods: (1 in total)
Namespace Name CPU Requests CPU Limits Memory Requests Memory Limits AGE
--------- ---- ------------ ---------- --------------- ------------- ---
kube-system svclb-traefik-w6fds 0 (0%) 0 (0%) 0 (0%) 0 (0%) 49m
Allocated resources:
(Total limits may be over 100 percent, i.e., overcommitted.)
Resource Requests Limits
-------- -------- ------
cpu 0 (0%) 0 (0%)
memory 0 (0%) 0 (0%)
ephemeral-storage 0 (0%) 0 (0%)
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Starting 49m kubelet, kworker.cloud.local Starting kubelet.
Warning InvalidDiskCapacity 49m kubelet, kworker.cloud.local invalid capacity 0 on image filesystem
Normal NodeHasSufficientMemory 49m kubelet, kworker.cloud.local Node kworker.cloud.local status is now: NodeHasSufficientMemory
Normal Starting 49m kubelet, kworker.cloud.local Starting kubelet.
Warning InvalidDiskCapacity 49m kubelet, kworker.cloud.local invalid capacity 0 on image filesystem
Normal NodeHasSufficientMemory 49m kubelet, kworker.cloud.local Node kworker.cloud.local status is now: NodeHasSufficientMemory
Normal NodeHasNoDiskPressure 49m kubelet, kworker.cloud.local Node kworker.cloud.local status is now: NodeHasNoDiskPressure
Normal NodeHasSufficientPID 49m kubelet, kworker.cloud.local Node kworker.cloud.local status is now: NodeHasSufficientPID
Normal Starting 49m kube-proxy, kworker.cloud.local Starting kube-proxy.
Normal NodeAllocatableEnforced 49m kubelet, kworker.cloud.local Updated Node Allocatable limit across pods
Normal NodeReady 49m kubelet, kworker.cloud.local Node kworker.cloud.local status is now: NodeReady
================================================================
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