RKE (Rancher Kubernetes Engine)

Introduction

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- short for Rancher Kubernetes Engine

- lightweight installer of K8 on bare-metal and virtual machines

- solves common issue on K8 installation -- complexity

Commands

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rke -d up --ignore-docker-version --config rancher-cluster.yml

rke etcd snapshot-save --name rancher_snapshot.b --config rancher-cluster.yml --ignore-docker-version

Tutorials

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Spinning up k8 cluster	Centos 7.5 Docker 17.03 Kubernetes 1.11 1. Download RKE binary 2 ... TBD
Removing a node	- comment out the node information on cluster.yml - execute "rke up"

Troubleshooting

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ssh: rejected: administratively prohibited

- update openssh to 7.4,and docker version v1.12.6 - set "AllowTcpForwarding yes" "PermitTunnel yes" to /etc/ssh/sshd_config, and   then restart sshd service - the host which run rke can ssh to all nodes without password - run: "groupadd docker" to create docker group,while docker group is not exist. - run: "useradd -g docker yourusername" to create yourusername user and set it's   group to docker - set the docker.service's MountFlags=shared (vi /xxx/xxx/docker.service) - run:"su yourusername" to change current user,and then restart the docker   service. so in the user yourusername session the docker.sock will be created in the path /var/run/docker.sock - in cluster.yml set the ssh user to yourusername(in setup hosts) https://github.com/rancher/rke/issues/93

FATA[0088] [workerPlane] Failed to bring up Worker Plane: Can't remove Docker container [rke-log-linker] for host [sample.host]: Error response from daemon: Driver overlay failed to remove root filesystem ABCD: remove /var/lib/docker/overlay/EFGH/merged: device or resource busy

- just retry ./rke up