在root用户下执行这个命令 xsync zookeeper-3.5.7/报底下的错误，请看一下原因和解决方案

==================== hadoop102 ====================
pdir=/root/opt
fname=zookeeper-3.5.7
ssh: Could not resolve hostname hadoop102: Name or service not known
ssh: Could not resolve hostname hadoop102: Name or service not known
rsync: connection unexpectedly closed (0 bytes received so far) [sender]
rsync error: unexplained error (code 255) at io.c(226) [sender=3.1.2]
==================== hadoop103 ====================
pdir=/root/opt
fname=zookeeper-3.5.7
ssh: Could not resolve hostname hadoop103: Name or service not known
ssh: Could not resolve hostname hadoop103: Name or service not known
rsync: connection unexpectedly closed (0 bytes received so far) [sender]
rsync error: unexplained error (code 255) at io.c(226) [sender=3.1.2]
==================== hadoop104 ====================
pdir=/root/opt
fname=zookeeper-3.5.7
ssh: Could not resolve hostname hadoop104: Name or service not known
ssh: Could not resolve hostname hadoop104: Name or service not known
rsync: connection unexpectedly closed (0 bytes received so far) [sender]
rsync error: unexplained error (code 255) at io.c(226) [sender=3.1.2]

Name or service not known，查看一下你机器配置的IP吧，hadoop102，hadoop103，hadoop104，无法识别，你先ping一下吧，比如ping hadoop103
可以用ifconfig查看本机的ip，用hostname查看本机名，然后修改/etc/hosts 保证三台机器名字ip一直，在设置ssh，好久没配过了，应该是这个流程