etcd部署以及Golang实现CRUD
部署步骤
1.安装etcd
git clone -b v3.5.0 https://github.com/etcd-io/etcd.git
cd etcd
./build.sh
export PATH="$PATH:`pwd`/bin"
etcd --version
2.组建集群
在每个etcd节点上，指定集群成员
TOKEN=token-01
CLUSTER_STATE=new
NAME_1=machine-1
NAME_2=machine-2
NAME_3=machine-3
HOST_1=192.168.135.133
HOST_2=192.168.135.134
HOST_3=192.168.135.135
CLUSTER=${NAME_1}=http://${HOST_1}:2380,${NAME_2}=http://${HOST_2}:2380,${NAME_3}=http://${HOST_3}:2380
在对应的机器上运行对应指令
# For machine 1
THIS_NAME=${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 ${TOKEN}
# For machine 2
THIS_NAME=${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 ${TOKEN}
# For machine 3
THIS_NAME=${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 ${TOKEN}
3. 现在etcd准备好了，使用etcdctl连接到etcd
export ETCDCTL_API=3
HOST_1=192.168.135.133
HOST_2=192.168.135.134
HOST_3=192.168.135.135
ENDPOINTS=$HOST_1:2379,$HOST_2:2379,$HOST_3:2379
etcdctl --endpoints=$ENDPOINTS member list
Golang实现CRUD
package main
import (
"context"
"fmt"
"go.etcd.io/etcd/client/v3"
"time"
)
func main() {
cli, err := clientv3.New(clientv3.Config{
Endpoints: []string{"192.168.135.133:2379", "192.168.135.134:2379", "192.168.135.135:2379"},
DialTimeout: 5 * time.Second,
})
if err != nil {
fmt.Printf("connect to etcd failed, err:%v\n", err)
return
}
defer cli.Close()
fmt.Println("connect to etcd success")
defer cli.Close()
go Watch(cli)
Create(cli)
Read(cli)
Delete(cli)
Update(cli)
select {}
}
func Watch(cli *clientv3.Client) {
rch := cli.Watch(context.Background(), "name") // type WatchChan <-chan WatchResponse
for wresp := range rch {
for _, ev := range wresp.Events {
fmt.Printf("Type: %s Key:%s Value:%s\n", ev.Type, ev.Kv.Key, ev.Kv.Value)
}
}
fmt.Println("out")
}
func Create(cli *clientv3.Client) {
// put
ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
_, err := cli.Put(ctx, "name", "wxf")
cancel()
if err != nil {
fmt.Printf("put to etcd failed, err:%v\n", err)
return
}
}
func Read(cli *clientv3.Client) {
//get
ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
resp, err := cli.Get(ctx, "name")
cancel()
if err != nil {
fmt.Printf("get from etcd failed, err:%v\n", err)
return
}
for _, ev := range resp.Kvs {
fmt.Printf("Type: %s Key:%s Value:%s\n", "READ", ev.Key, ev.Value)
}
}
func Update(cli *clientv3.Client) {
// put
ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
_, err := cli.Put(ctx, "name", "xyy")
cancel()
if err != nil {
fmt.Printf("put to etcd failed, err:%v\n", err)
return
}
}
func Delete(cli *clientv3.Client) {
//del
ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
_, err := cli.Delete(ctx, "name")
cancel()
if err != nil {
fmt.Printf("delete from etcd failed, err:%v\n", err)
return
}
}
