Rancher-k8s-Cluster

Lets configure a Kubernetes cluster with three nodes DEBIAN 9.4 and on top of it we will configure Rancher to manage services, images, etc.

Prerequisites

3 nodes Debian 9.4 with full network visibility between them.
1 FW or HAPROXY to make SSL Offloading with and interface in the same subnet as the 3 nodes.
Basic installation of: wget, curl, etc

apt-get install -y vim mc uml-utilities ntp qemu-guest-agent \
htop sudo curl git git-core etckeeper zsh apt-transport-https ca-certificates \
bridge-utils gettext-base
usermod root -s /bin/zsh
sh -c "$(curl -fsSL https://raw.githubusercontent.com/robbyrussell/oh-my-zsh/master/tools/install.sh)"
sed -ri 's/ZSH_THEME="robbyrussell"/ZSH_THEME="pygmalion"/g' .zshrc
sed -ri 's/plugins=\(git\)/plugins=\(debian apt systemd docker zsh-navigation-tools\)/g' .zshrc
echo 'export VTYSH_PAGER=more' >> /etc/zsh/zshenv
source .zshrc

Install docker

Install only one of the supported versions of Docker-CE. You can review the list in the following link: https://rancher.com/quick-start/ (For Rancher 2.0)
Lets start installing Docker: https://docs.docker.com/install/linux/docker-ce/ubuntu/

apt-get remove docker docker-engine docker.io && apt-get update
apt-get install -y \
    apt-transport-https \
    ca-certificates \
    curl \
    software-properties-common
curl -fsSL https://download.docker.com/linux/debian/gpg | sudo apt-key add -
add-apt-repository \
   "deb [arch=amd64] https://download.docker.com/linux/debian \
   $(lsb_release -cs) \
   stable"
apt-get update && apt-cache madison docker-ce
apt-get install -y docker-ce=17.03.2~ce-0~debian-stretch

Launch Rancher 2.0

This method is not recommended for PRODUCTION ENVIRONMENTS.

Launching with a single container and a bind mount MySQL Volume

mkdir -p /opt/mysql-rancher \
docker run -d -v /opt/mysql-rancher:/var/lib/mysql \
--restart=unless-stopped -p 8080:8080 rancher/rancher:latest \

See more launching methods here: https://rancher.com/docs/rancher/v1.6/en/installing-rancher/installing-server/#single-container-bind-mount

Access to Rancher

In your browser: http://localhost:8080 or set rancher.ironshared.com to the public IP of the firewall or HAProxy that you put in front of Rancher in your etc/hosts or local DNS.

Add a Host to Rancher

Click Infrastructure - Host - Custom and then put as many labels as you need and add the same host where you are running Rancher.
This will generate a script to register the new host:

docker run -d --privileged --restart=unless-stopped --net=host -v /etc/kubernetes:/etc/kubernetes \ -v /var/run:/var/run rancher/rancher-agent:v2.0.0 --server https://10.200.1.10  \
--token 55ckhhsj9bdlckzzw7jchhdbtdwms45lnwm4644q9r7vlpzn6vvm88 \
--ca-checksum 2acbc5767bf3cdba8f5d42f547ba403bffd908d4df6b8a938793f3e9d699eb37 \ --internal-address 10.200.1.11 --etcd --controlplane --worker --label \ cluster=ironshared-staging --label env=staging --label hostname=rancher202

IMPORTANT: be sure that https://10.200.1.10 is correctly accessed by the host before executing this line. Once this is launched, it will pull Rancher Agent and install in the designated server.