Tomcat No route to host

org.apache.catalina.tribes.group.interceptors.TcpFailureDetector memberAlive
严重: Unable to perform. failure detection check, assuming member down.
java.net.NoRouteToHostException: No route to host

防火墙对应的Tomcat端口未开放引起的，只要添加端口就OK了

centos :

/etc/init.d/iptables status
vi /etc/sysconfig/iptables 
-A INPUT -p tcp -m state --state NEW -m tcp --dport 8081 -j ACCEPT

Ubuntu：

sudo ufw allow 8080