1、查看删除旧版本

ll -a /usr/local/go
rm -rf /usr/local/go

2、下载安装新版本

mkdir backup
cd backup
wget https://golang.google.cn/dl/go1.15.1.linux-amd64.tar.gz
sudo tar -zxf go1.15.1.linux-amd64.tar.gz -C /usr/local

3、配置

sudo mkdir /usr/lib/gopath
sudo vim /etc/profile
source /etc/profile

#golang config
export GO111MODULE=on
export GOPROXY=https://goproxy.cn,direct
#export GOPROXY=https://goproxy.io,direct
export GOROOT=/usr/local/go 
export GOPATH=/usr/lib/gopath
export PATH=$PATH:$GOROOT/bin:$GOPATH/bin

4、测试

go version
vim hello.go
go run hello.go

package main
import "fmt"
func main() {
  fmt.Printf("Hello, world!\n")
}

参考：

centos 7 安装golang1.14.4

centos下安装golang环境