mathuin

#!/usr/bin/env sh
docker-machine rm -f rancher host1
docker-machine create rancher --driver virtualbox --virtualbox-cpu-count "-1" --virtualbox-disk-size "8000" --virtualbox-memory "512" --virtualbox-boot2docker-url=https://github.com/boot2docker/boot2docker/releases/download/v1.11.2/boot2docker.iso
docker-machine scp scripts/rancher-net.sh rancher:.
docker-machine ssh rancher sh rancher-net.sh
docker-machine regenerate-certs rancher -f
eval $(docker-machine env rancher)
docker-compose up -d
eval $(docker-machine env -u)
docker-machine create host1 --driver virtualbox --virtualbox-cpu-count "-1" --virtualbox-disk-size "54000" --virtualbox-memory "2048" --virtualbox-boot2docker-url=https://github.com/boot2docker/boot2docker/releases/download/v1.11.2/boot2docker.iso

superseb

#!/bin/bash
RANCHER_URL=http://rancher_server:8080
ENV=1a7

for host in `curl -s http://$RANCHER_URL/v2-beta/projects/$ENV/hosts/ | jq -r '.data[] | select(.state == "disconnected") | .id'`; do echo Deactivating $host; curl -X POST -d '{}' http://$RANCHER_URL/v2-beta/projects/$ENV/hosts/$host/?action=deactivate; echo Deleting $host; curl -X DELETE -H 'Accept: application/json' http://$RANCHER_URL/v2-beta/projects/$ENV/hosts/$host; done

jgreat

storageClass with PersistentVolumeClaims are really the way to do storage with Kubernetes.

For Azure There are 3 types of storage avalible.

• (Slow, Limited, Going to cause tears) AzureFiles - CIFS share, with all the limitaions of CIFS :(
• (Better) Azure Disk (Storage Account) - You can use this type with Azure "Node Driver" VMs in Rancher.
• (Best) Azure Disk (Managed) - You will need to create your own VMs that support managed disk with premium storage, then use the "Custom" option.

superseb

Deploy kubernetes-dashboard on Rancher 2.x cluster exposed using NodePort

This has been updated to install Dashboard v2.0.0, see below for pre v2.0.0 instructions

Requirements

• kubectl (https://kubernetes.io/docs/tasks/tools/install-kubectl/)

Step 1: Generate kubeconfig from the UI

Generate the kubeconfig file for your cluster using the Kubeconfig File button in the Cluster view of your cluster.

superseb

#!/bin/bash
if [[ $DEBUG == "true" ]]; then
  set -x
fi

# Check if tools exist
command -v jq >/dev/null 2>&1 || { echo "jq is not installed. Exiting." >&2; exit 1; }
command -v dig >/dev/null 2>&1 || { echo "dig is not installed. Exiting." >&2; exit 1; }
command -v curl >/dev/null 2>&1 || { echo "curl is not installed. Exiting." >&2; exit 1; }
command -v sed >/dev/null 2>&1 || { echo "sed is not installed. Exiting." >&2; exit 1; }

Oats87

#!/bin/bash
echo "This will generate a new kube config for accessing your RKE-created kubernetes cluster. This script MUST be run on a Kubernetes node."
echo "Please enter the IP of one of your control plane hosts, followed by [ENTER]:"

read cphost

openssl genrsa -out kube-admin.key 2048
openssl req -new -sha256 -key kube-admin.key -subj "/O=system:masters/CN=kube-admin" -out kube-admin.csr
sudo openssl x509 -req -in kube-admin.csr -CA /etc/kubernetes/ssl/kube-ca.pem -CAcreateserial -CAkey /etc/kubernetes/ssl/kube-ca-key.pem -out kube-admin.crt -days 365 -sha256
sudo rm -f /etc/kubernetes/ssl/kube-ca.srl

Oats87

# Docker 17.03.2 on RHEL/CentOS 7

Rancher has discovered a few issues when running Upstream Docker 17.03.2 on RHEL/CentOS 7. This document is being written to document recommendations for Docker configuration in order to ensure reliability while operating Kubernetes and Rancher with RHEL/CentOS 7.

### Overlay2 Storage Driver

Currently, Upstream Docker 17.03.2 performs kernel version validations to enable overlay2. As official overlay2 support from the upstream Linux kernel was not enabled until version 4.0 or higher than the kernel. Red Hat backported overlay2 support to 3.10.0-514 of their kernel.

Overlay2 support can be enabled by setting the following contents in the `/etc/docker/daemon.json` file and restarting Docker. Please note that you must do this on a fresh docker installation, or remove all running containers before performing this action.
```{

Oats87

{
  "storage-driver": "overlay2",
  "storage-opts": [
    "overlay2.override_kernel_check=true"
  ],
  "exec-opts": [
    "native.cgroupdriver=systemd"
  ]
}

janeczku

Steps to change the URL of Rancher installation and switch from a self-signed certificate to a certificate signed by recognized CA.

1. Change the Rancher server-url setting to the new URL:
   • Navigate to https://<old_rancher_hostname>/g/settings/advanced
   • Edit server-url to https://<new_rancher_hostname>
2. Clear the private CA certificate for the old certificate
   • Navigate to https://<old_rancher_hostname>/g/settings/advanced
   • Next to cacerts click context menu -> View in API
   • Click Edit
   • Clear the content of the value field

superseb

Troubleshooting Kubernetes commands

Commands belonging to the Rancher webinar Troubleshooting Kubernetes

etcd

Check etcd members

docker exec etcd etcdctl member list