# For each machine

TOKEN=my-etcd-token-1

CLUSTER_STATE=new

NAME_1=etcd-node-1

NAME_2=etcd-node-2

NAME_3=etcd-node-3

HOST_1=10.240.0.13

HOST_2=10.240.0.14

HOST_3=10.240.0.15

CLUSTER=${NAME_1}=http://${HOST_1}:2380,${NAME_2}=http://${HOST_2}:2380,${NAME_3}=http://${HOST_3}:2380

# For node 1

THIS_NAME=${NAME_1}

THIS_IP=${HOST_1}

etcd --data-dir=data.etcd --name ${THIS_NAME} \

	--initial-advertise-peer-urls http://${THIS_IP}:2380 \

	--listen-peer-urls http://${THIS_IP}:2380 \

	--advertise-client-urls http://${THIS_IP}:2379 \

	--listen-client-urls http://${THIS_IP}:2379 \

	--initial-cluster ${CLUSTER} \

	--initial-cluster-state ${CLUSTER_STATE} \

	--initial-cluster-token ${TOKEN}

# For node 2

THIS_NAME=${NAME_2}

THIS_IP=${HOST_2}

etcd --data-dir=data.etcd --name ${THIS_NAME} \

	--initial-advertise-peer-urls http://${THIS_IP}:2380 \

	--listen-peer-urls http://${THIS_IP}:2380 \

	--advertise-client-urls http://${THIS_IP}:2379 \

	--listen-client-urls http://${THIS_IP}:2379 \

	--initial-cluster ${CLUSTER} \

	--initial-cluster-state ${CLUSTER_STATE} \

	--initial-cluster-token ${TOKEN}

# For node 3

THIS_NAME=${NAME_3}

THIS_IP=${HOST_3}

etcd --data-dir=data.etcd --name ${THIS_NAME} \

	--initial-advertise-peer-urls http://${THIS_IP}:2380 \

	--listen-peer-urls http://${THIS_IP}:2380 \

	--advertise-client-urls http://${THIS_IP}:2379 \

	--listen-client-urls http://${THIS_IP}:2379 \

	--initial-cluster ${CLUSTER} \

	--initial-cluster-state ${CLUSTER_STATE} \

	--initial-cluster-token ${TOKEN}

Then replace a member with member remove and member add commands:

# get member ID

export ETCDCTL_API=3

HOST_1=10.240.0.13

HOST_2=10.240.0.14

HOST_3=10.240.0.15

etcdctl --endpoints=${HOST_1}:2379,${HOST_2}:2379,${HOST_3}:2379 member list

# remove the member

MEMBER_ID=278c654c9a6dfd3b

etcdctl --endpoints=${HOST_1}:2379,${HOST_2}:2379,${HOST_3}:2379 \

	member remove ${MEMBER_ID}

# add a new member (node 4)

export ETCDCTL_API=3

NAME_1=etcd-node-1

NAME_2=etcd-node-2

NAME_4=etcd-node-4

HOST_1=10.240.0.13

HOST_2=10.240.0.14

HOST_4=10.240.0.16 # new member

etcdctl --endpoints=${HOST_1}:2379,${HOST_2}:2379 \

	member add ${NAME_4} \

	--peer-urls=http://${HOST_4}:2380

Next, start the new member with --initial-cluster-state existing flag:

# [WARNING] If the new member starts from the same disk space,

# make sure to remove the data directory of the old member

#

# restart with 'existing' flag

TOKEN=my-etcd-token-1

CLUSTER_STATE=existing

NAME_1=etcd-node-1

NAME_2=etcd-node-2

NAME_4=etcd-node-4

HOST_1=10.240.0.13

HOST_2=10.240.0.14

HOST_4=10.240.0.16 # new member

CLUSTER=${NAME_1}=http://${HOST_1}:2380,${NAME_2}=http://${HOST_2}:2380,${NAME_4}=http://${HOST_4}:2380

THIS_NAME=${NAME_4}

THIS_IP=${HOST_4}

etcd --data-dir=data.etcd --name ${THIS_NAME} \

	--initial-advertise-peer-urls http://${THIS_IP}:2380 \

	--listen-peer-urls http://${THIS_IP}:2380 \

	--advertise-client-urls http://${THIS_IP}:2379 \

	--listen-client-urls http://${THIS_IP}:2379 \

	--initial-cluster ${CLUSTER} \

	--initial-cluster-state ${CLUSTER_STATE} \

	--initial-cluster-token ${TOKEN}

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