1、问题描述

搭建rocketmq集群时，使用ssh-copy-id命令拷贝密钥到其他机器，如hadoop01,hadoop02，出现如下错误信息

[root@hadoop03 .ssh]# ssh-copy-id hadoop02
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed

/usr/bin/ssh-copy-id: ERROR: ssh: Could not resolve hostname hadoop02: Name or service not known

[root@hadoop03 .ssh]# ssh-copy-id hadoop01
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed

/usr/bin/ssh-copy-id: ERROR: ssh: Could not resolve hostname hadoop01: Name or service not known

如图：

2、切换root账户执行

su root命令

3、编辑/etc/hosts文件，执行如下命令

vi /etc/hosts

在文件末尾添加以下配置

 wq!保存并退出

4、再次执行命令

ssh-copy-id hadoop02

输出信息如下

错误解决 

Rocketmq的单机环境搭建

centos7.x搭建rocketmq-4.9.3单机环境_爱编码阿信的博客-CSDN博客

Rocketmq的集群环境搭建

rocketmq集群（一），基于centos7搭建rocketmq集群-2m-2s-async_爱编码阿信的博客-CSDN博客