如何在多个实例中运行etcd？

Question

我试图使用AWS中的3个实例运行etcd，但是当我试图列出成员时，我会得到下面的错误：

[ec2-user@etcd1 ~]$ etcdctl member list
{"level":"warn","ts":"2021-10-19T04:50:01.981Z","logger":"etcd-client","caller":"v3/retry_interceptor.go:62","msg":"retrying of unary invoker failed","target":"etcd-endpoints://0xc0002e0a80/127.0.0.1:2379","attempt":0,"error":"rpc error: code = DeadlineExceeded desc = context deadline exceeded"}
Error: context deadline exceeded

我用下面的命令开始我的实例：

实例1：

etcd --data-dir=data.etcd --name etcd1 \
    --initial-advertise-peer-urls http://localhost:2380 --listen-peer-urls http://localhost:2380 \
    --advertise-client-urls http://localhost:2379 --listen-client-urls http://localhost:2379 \
    --initial-cluster etcd1=http://etcd1:2380,etcd2=http://etcd2:2380,etcd3=http://etcd3:2380 \
    --initial-cluster-state new --initial-cluster-token token-01

实例2：

etcd --data-dir=data.etcd --name etcd2 \
    --initial-advertise-peer-urls http://localhost:2380 --listen-peer-urls http://localhost:2380 \
    --advertise-client-urls http://localhost:2379 --listen-client-urls http://localhost:2379 \
    --initial-cluster etcd1=http://etcd1:2380,etcd2=http://etcd2:2380,etcd3=http://etcd3:2380 \
    --initial-cluster-state new --initial-cluster-token token-01

实例3：

etcd --data-dir=data.etcd --name etcd3 \
    --initial-advertise-peer-urls http://localhost:2380 --listen-peer-urls http://localhost:2380 \
    --advertise-client-urls http://localhost:2379 --listen-client-urls http://localhost:2379 \
    --initial-cluster etcd1=http://etcd1:2380,etcd2=http://etcd2:2380,etcd3=http://etcd3:2380 \
    --initial-cluster-state new --initial-cluster-token token-01

拜托，如果你知道我做错了什么，请告诉我。

Answer 1

对我来说，您似乎遵循了https://etcd.io/docs/v3.5/demo/#set-up-a-cluster，如果是这样的话，有两件事您应该改变：

1. 您使用localhost代替了${THIS_IP}变量，当它应该是可以从集群中的每个vm访问的vm IP地址(只要它是可访问的)
2. ，您在--initial-cluster选项中使用etcdX，这些应该是vm的IP，而不是etcd成员的名称

G 210

我建议的是在每个vm中设置这些变量：

TOKEN=token-01
CLUSTER_STATE=new
NAME_1=etcd1
NAME_2=etcd2
NAME_3=etcd3
HOST_1=10.240.0.17 # <- should be ip of 1st vm
HOST_2=10.240.0.18 # <- should be ip of 2nd vm
HOST_3=10.240.0.19 # <- should be ip of 3rd vm
CLUSTER=${NAME_1}=http://${HOST_1}:2380,${NAME_2}=http://${HOST_2}:2380,${NAME_3}=http://${HOST_3}:2380

然后用下面的etcd1命令启动etcd

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}

下面是etcd2的命令

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}

以下为etcd3

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}