连接zookeeper时候提示zookeeper Will not attempt to authenticate using SASL (unknown error)
先检查linux服务器防火墙问题：
启动：systemctl start firewalld.service
关闭：systemctl stop firewalld.service
重启：systemctl restart firewalld.service
显示状态：systemctl status firewalld.service
在开机时启用：systemctl enable firewalld.service
在开机时禁用：systemctl disable firewalld.service
查看服务是否开机启动：systemctl is-enabled firewalld.service
查看已启动的服务列表：systemctl list-unit-files|grep enabled
查看启动失败的服务列表：systemctl --failed
