vagrant-lab-k8s/provision/rke2-server.sh

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#!/bin/bash
set -euo pipefail
#
# Helper functions
#
declare -i term_width=80
h1() {
declare border padding text
border='\e[1;34m'"$(printf '=%.0s' $(seq 1 "$term_width"))"'\e[0m'
padding="$(printf ' %.0s' $(seq 1 $(((term_width - $(wc -m <<<"$*")) / 2))))"
text="\\e[1m$*\\e[0m"
echo -e "$border"
echo -e "${padding}${text}${padding}"
echo -e "$border"
}
h2() {
printf '\e[1;33m==>\e[37;1m %s\e[0m\n' "$*"
}
rke2_command="$1"; shift
rke2_channel="${1:-latest}"; shift
rke2_version="${1:-v1.21.5+rke2r1}"; shift
ip_address="$1"; shift
krew_version="${1:-v0.4.1}"; shift || true # NB see https://github.com/kubernetes-sigs/krew
fqdn="$(hostname --fqdn)"
rke2_url="https://server.$(hostname --domain):9345"
h1 "Install rke2 server"
h2 "Version: ${rke2_version}"
h2 "Server url: ${rke2_url}"
cat >/etc/motd <<'EOF'
_ ____
_ __| | _____|___ \ ___ ___ _ ____ _____ _ __
| '__| |/ / _ \ __) | / __|/ _ \ '__\ \ / / _ \ '__|
| | | < __// __/ _\__ \ __/ | \ V / __/ |
|_| |_|\_\___|_____(_)___/\___|_| \_/ \___|_|
EOF
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h1 "Configure rke2 server"
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# configure the rke2 server.
# see https://docs.rke2.io/install/install_options/install_options/
# see https://docs.rke2.io/install/install_options/server_config/
install -d -m 700 /etc/rancher/rke2
install /dev/null -m 600 /etc/rancher/rke2/config.yaml
if [ "$rke2_command" != 'cluster-init' ]; then
cat >>/etc/rancher/rke2/config.yaml <<EOF
server: $rke2_url
token: $(cat /vagrant/tmp/node-token)
EOF
fi
cat >>/etc/rancher/rke2/config.yaml <<EOF
node-ip: $ip_address
node-taint: CriticalAddonsOnly=true:NoExecute
tls-san:
- server.$(hostname --domain)
- $fqdn
cni: calico
cluster-cidr: 10.12.0.0/16
service-cidr: 10.13.0.0/16
cluster-dns: 10.13.0.10
cluster-domain: cluster.local
EOF
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h1 "Install rke2 server"
h2 "Version: ${rke2_version}"
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# install rke2 server.
# see https://docs.rke2.io/install/install_options/install_options/
# see https://docs.rke2.io/install/install_options/server_config/
curl -sfL https://raw.githubusercontent.com/rancher/rke2/$rke2_version/install.sh \
| \
INSTALL_RKE2_CHANNEL="$rke2_channel" \
INSTALL_RKE2_VERSION="$rke2_version" \
INSTALL_RKE2_TYPE="server" \
sh -
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h2 "Start rke2 server"
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# start the rke2-server service.
systemctl cat rke2-server
systemctl enable rke2-server.service
systemctl start rke2-server.service
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h2 "Configure system path for rke2"
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# symlink the utilities and setup the environment variables to use them.
ln -fs /var/lib/rancher/rke2/bin/{kubectl,crictl,ctr} /usr/local/bin/
cat >/etc/profile.d/01-rke2.sh <<'EOF'
export CONTAINERD_ADDRESS=/run/k3s/containerd/containerd.sock
export CONTAINERD_NAMESPACE=k8s.io
export CRI_CONFIG_FILE=/var/lib/rancher/rke2/agent/etc/crictl.yaml
export KUBECONFIG=/etc/rancher/rke2/rke2.yaml
EOF
source /etc/profile.d/01-rke2.sh
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h1 "wait for this node to be Ready."
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# e.g. server Ready control-plane,etcd,master 3m v1.21.5+rke2r1
$SHELL -c 'node_name=$(hostname); echo "waiting for node $node_name to be ready..."; while [ -z "$(kubectl get nodes $node_name | grep -E "$node_name\s+Ready\s+")" ]; do sleep 3; done; echo "node ready!"'
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h1 "wait for the kube-dns pod to be Running."
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# e.g. rke2-coredns-rke2-coredns-7bb4f446c-jksvq 1/1 Running 0 33m
$SHELL -c 'while [ -z "$(kubectl get pods --selector k8s-app=kube-dns --namespace kube-system | grep -E "\s+Running\s+")" ]; do sleep 3; done'
if [ "$rke2_command" == 'cluster-init' ]; then
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h2 "Copy server token to shared directory"
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install -d /vagrant/tmp
cp /var/lib/rancher/rke2/server/node-token /vagrant/tmp/node-token
fi
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h1 "Install krew package manager"
h2 "Version: ${krew_version}"
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apt-get install -y --no-install-recommends git
wget -qO- "https://github.com/kubernetes-sigs/krew/releases/download/$krew_version/krew.tar.gz" | tar xzf - ./krew-linux_amd64
wget -q "https://github.com/kubernetes-sigs/krew/releases/download/$krew_version/krew.yaml"
./krew-linux_amd64 install --manifest=krew.yaml
rm krew-linux_amd64
cat >/etc/profile.d/krew.sh <<'EOF'
export PATH="${KREW_ROOT:-$HOME/.krew}/bin:$PATH"
EOF
source /etc/profile.d/krew.sh
kubectl krew version
# install the bash completion scripts.
crictl completion bash >/usr/share/bash-completion/completions/crictl
kubectl completion bash >/usr/share/bash-completion/completions/kubectl
# save kubeconfig in the host.
if [ "$rke2_command" == 'cluster-init' ]; then
mkdir -p /vagrant/tmp
python3 - <<EOF
import base64
import yaml
d = yaml.load(open('/etc/rancher/rke2/rke2.yaml', 'r'))
# save cluster ca certificate.
for c in d['clusters']:
open(f"/vagrant/tmp/{c['name']}-ca-crt.pem", 'wb').write(base64.b64decode(c['cluster']['certificate-authority-data']))
# save user client certificates.
for u in d['users']:
open(f"/vagrant/tmp/{u['name']}-crt.pem", 'wb').write(base64.b64decode(u['user']['client-certificate-data']))
open(f"/vagrant/tmp/{u['name']}-key.pem", 'wb').write(base64.b64decode(u['user']['client-key-data']))
print(f"Kubernetes API Server https://$ip_address:6443 user {u['name']} client certificate in tmp/{u['name']}-*.pem")
# set the server ip.
for c in d['clusters']:
c['cluster']['server'] = 'https://$ip_address:6443'
yaml.dump(d, open('/vagrant/tmp/admin.conf', 'w'), default_flow_style=False)
EOF
fi
# show cluster-info.
kubectl cluster-info
# list etcd members.
etcdctl --write-out table member list
# show the endpoint status.
etcdctl --write-out table endpoint status
# list nodes.
kubectl get nodes -o wide
# rbac info.
kubectl get serviceaccount --all-namespaces
kubectl get role --all-namespaces
kubectl get rolebinding --all-namespaces
kubectl get rolebinding --all-namespaces -o json | jq .items[].subjects
kubectl get clusterrole --all-namespaces
kubectl get clusterrolebinding --all-namespaces
kubectl get clusterrolebinding --all-namespaces -o json | jq .items[].subjects
# rbac access matrix.
# see https://github.com/corneliusweig/rakkess/blob/master/doc/USAGE.md
kubectl krew install access-matrix
kubectl access-matrix version --full
kubectl access-matrix # at cluster scope.
kubectl access-matrix --namespace default
kubectl access-matrix --sa kubernetes-dashboard --namespace kubernetes-dashboard
# list system secrets.
kubectl -n kube-system get secret
# list all objects.
# NB without this hugly redirect the kubectl output will be all messed
# when used from a vagrant session.
kubectl get all --all-namespaces
# really get all objects.
# see https://github.com/corneliusweig/ketall/blob/master/doc/USAGE.md
kubectl krew install get-all
kubectl get-all
# list services.
kubectl get svc
# list running pods.
kubectl get pods --all-namespaces -o wide
# list runnnig pods.
crictl pods
# list running containers.
crictl ps
ctr containers ls
# show listening ports.
ss -n --tcp --listening --processes
# show network routes.
ip route
# show memory info.
free
# show versions.
kubectl version
crictl version
ctr version