Distributed key-value store — Kubernetes uses it for cluster state
What is this?
etcd is a distributed key-value store — Kubernetes stores all cluster state in etcd.
Step 01
1# Single-node dev cluster2ETCD_VER=v3.5.153curl -L https://github.com/etcd-io/etcd/releases/download/${ETCD_VER}/etcd-${ETCD_VER}-linux-amd64.tar.gz -o etcd.tar.gz4tar xzf etcd.tar.gz && sudo mv etcd-${ETCD_VER}-linux-amd64/etcd* /usr/local/bin/Step 02
1etcd --name dev --data-dir /tmp/etcd-data \2 --listen-client-urls http://127.0.0.1:2379 \3 --advertise-client-urls http://127.0.0.1:23794 5# Another terminal:6etcdctl put mykey "hello"7etcdctl get mykeyStep 03
1etcdctl endpoint health2etcdctl member listStep 04
1etcdctl endpoint health --endpoints=http://127.0.0.1:23792sudo ss -tlnp | grep 23793# Check data dir permissions4ls -la /tmp/etcd-data