tools

• etcd

  • check healthy

  • re-add etcd

• network

  • ingress

• jobs

• valut

• eks

• prometheus

• others

  • How To Create Kubernetes YAML Manifests Quickly

etcd

references:

• Operating etcd clusters for Kubernetes

• Set up a High Availability etcd Cluster with kubeadm

• etcd.io: How to Add and Remove Members

check healthy

$ kubectl get --raw=/healthz/etcd

re-add etcd

$ ssh [e-mail]
$ docker run -it \
             -v /var/lib/etcd:/var/lib/etcd \
             -v /etc/kubernetes/pki/etcd:/etc/kubernetes/pki/etcd \
             -p 2380:2380 \
             -p 2379:2379 \
             --network=host \
             k8s.gcr.io/etcd:3.2.24

# running inside docker
$ etcdctl --ca-file /etc/kubernetes/pki/etcd/ca.crt \
          --cert-file /etc/kubernetes/pki/etcd/peer.crt \
          --key-file /etc/kubernetes/pki/etcd/peer.key \
          -endpoints=https://<master3IP>:2379,https://<master2IP>:2379,https://<master1IP>:2379 \
          member list
 >> a874c87fd42044f: name=<master1Hostname> peerURLs=https://<master1IP>:2380 clientURLs=https://<master1IP>:2379 isLeader=true
 >> 3be12ef2ee5f92e7(unstarted): name=<master3Hostname> peerURLs=https://<master3IP>:2380
 >> da3e2155721a00f6: name=<master2Hostname> peerURLs=https://<master2IP>:2380 clientURLs=https://<master2IP>:2379 isLeader=false


# remove "unstarted" node
$ etcdctl --ca-file /etc/kubernetes/pki/etcd/ca.crt \
          --cert-file /etc/kubernetes/pki/etcd/peer.crt \
          --key-file /etc/kubernetes/pki/etcd/peer.key \
          -endpoints=https://<master3IP>:2379,https://<master2IP>:2379,https://<master1IP>:2379 \
          member remove 3be12ef2ee5f92e7

# re-add again
$ etcdctl --ca-file /etc/kubernetes/pki/etcd/ca.crt \
          --cert-file /etc/kubernetes/pki/etcd/peer.crt \
          --key-file /etc/kubernetes/pki/etcd/peer.key \
          -endpoints=https://<master3IP>:2379,https://<master2IP>:2379,https://<master1IP>:2379 \
          member add <master3Hostname> https://<master3IP>:2380

network

ingress

ingress architecture

• traffic flow

[!NOTE|label:references:]

• Kubernetes Ingress Tutorial For Beginners

jobs

[!NOTE|label:references:]

• How To Create Kubernetes Jobs and Cronjobs – Getting Started Guide

valut

[!NOTE|label:references:]

• How to Setup Vault in Kubernetes- Beginners Tutorial

eks

[!NOTE|label:references:]

• How to Create AWS EKS Cluster Using eksctl

prometheus

references:

• Grafana Cloud documentation

• New in Kubernetes Monitoring: cost management, resource usage monitoring, and more

• Explore your infrastructure with Kubernetes Monitoring

others

How To Create Kubernetes YAML Manifests Quickly