connect to host slavenode1 port 22: No route to host

报错信息：

[root@masternode1 ~]# ssh-copy-id -i /root/.ssh/id_dsa.pub slavenode1
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_dsa.pub"
/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: connect to host slavenode1 port 22: No route to host

分析解决：

1. 检查网络状态,尝试ping百度和自己

 ping www.baidu.com
 ping+自己ip

如果网络可以ping通没有问题，再进行下一步：

2. 关闭防火墙

systemctl stop firewalld.service #关闭防火墙
systemctl disable firewalld.service #禁止开机自启

3. 重启网卡

service network restart

4. 启动sshd服务

/usr/sbin/sshd 

5. 仔细检查 /etc/hosts文件

vim /etc/hosts

至此，检查完这些，问题应该得以解决了，很高心能帮到你