chadmcrowell

Scanning eBPF helper functions...
eBPF helpers supported for program type socket_filter:
	- bpf_map_lookup_elem
	- bpf_map_update_elem
	- bpf_map_delete_elem
	- bpf_ktime_get_ns
	- bpf_get_prandom_u32
	- bpf_get_smp_processor_id
	- bpf_tail_call
	- bpf_perf_event_output

chadmcrowell

apiVersion: cilium.io/v2
kind: CiliumNetworkPolicy
metadata:
  name: my-app-policy
  namespace: default
spec:
  endpointSelector:
    matchLabels:
      app: my-app
  ingress:

chadmcrowell

apiVersion: v1
kind: ConfigMap
metadata:
  name: envoy-config
  namespace: default
data:
  envoy.yaml: |
    static_resources:
      listeners:
      - name: listener_0

chadmcrowell

helm install cilium cilium/cilium --version 1.15.5 --namespace kube-system \
  --set global.enabled=true \
  --set global.kubernetesServiceHost=<your-k8s-api-server> \
  --set global.kubernetesServicePort=<your-k8s-api-port> \
  --set global.hubble.enabled=true \
  --set global.hubble.metrics.enabled="{dns,drop,tcp,flow,port-distribution,icmp,http}" \
  --set global.hubble.ui.enabled=true \
  --set global.hubble.relay.enabled=true \
  --set global.egressGateway.enabled=true \
  --set global.ingressController.enabled=true \

chadmcrowell

######################################
######### DISABLING SERVICES #########
######################################
# view running services
systemctl | grep running

# view state of snapd service
systemctl status snapd

# stop the snapd service

chadmcrowell

# use the following lab environment:
# https://studyk8s.club/cka-configmaps

# create the configmap 
cat << EOF > redis-configMap.yaml
apiVersion: v1
data:
  redis-config: |
    maxmemory: 2mb
    maxmemory-policy: allkeys-lru

chadmcrowell

# perform the commands from this lab environment:
# https://studyk8s.club/cka-logging

# create a pod that will output logs to stdout
cat << EOF > pod-logging.yaml
apiVersion: v1
kind: Pod
metadata:
  name: pod-logging
spec:

chadmcrowell

# perform the command from this lab environment:
# https://studyk8s.club/cka-upgrade-k8s

# plan the upgrade
kubeadm upgrade plan

# upgrade the version of kubeadm
sudo apt-get update
sudo apt-get install -y apt-transport-https ca-certificates curl gpg
mkdir -p /etc/apt/keyrings/

chadmcrowell

# perform the commands from the following lab environment:
# https://studyk8s.club/cka-new-user

# view the config
k config-view
cat ~/.kube/config
echo $KUBECONFIG
cat /etc/kubernetes/admin.conf

# list the cluster users

chadmcrowell

# perform the commands from the following lab environment:
# https://studyk8s.club/cka-ectd-backup

# set etcdctl environment variable api to version 3
export ECTDCTL_API=3

# etcd help menu
etcdctl snapshot -h

# backup etcd