elasticsearch5.4集群超时

四个节点，有两个是新增加的节点，两个老节点间组成集群没有问题，新增加了两个节点，无论是四个组成集群

# --------------------------------- Discovery ----------------------------------
#
# Pass an initial list of hosts to perform discovery when new node is started:
# The default list of hosts is ["127.0.0.1", "[::1]"]
#
discovery.zen.ping.unicast.hosts: ["10.96.91.208","10.96.91.209","10.96.91.210","10.96.91.211"]
#
# Prevent the "split brain" by configuring the majority of nodes (total number of master-eligible nodes / 2 + 1):
#
discovery.zen.minimum_master_nodes: 3
#
# For more information, consult the zen discovery module documentation.
#

还是两个节点集群(新旧搭配)

# --------------------------------- Discovery ----------------------------------
#
# Pass an initial list of hosts to perform discovery when new node is started:
# The default list of hosts is ["127.0.0.1", "[::1]"]
#
discovery.zen.ping.unicast.hosts: ["10.96.91.208","10.96.91.210"]
#
# Prevent the "split brain" by configuring the majority of nodes (total number of master-eligible nodes / 2 + 1):
#
discovery.zen.minimum_master_nodes: 2
#
# For more information, consult the zen discovery module documentation.

　　

查看日志，可以发现是网络问题。
排查网络
网卡的网络配置

cd /etc/sysconfig/network/
more ifcfg-eth0

　　

网络路由配置

more routes

网关配置

more /etc/resolv.conf

这些配置四台服务器基本都是一样的。所以不是配置问题
继续检查ping 和 traceroute
ping没有问题
traceroute显示不一样，发现有了一个空跳。怀疑是防火墙的问题

查看防火墙的状态

chkconfig --list|grep fire

关闭防火墙

cd /etc/init.d/
./SuSEfirewall2_setup stop
./SuSEfirewall2_init stop

开机关闭防火墙

chkconfig SuSEfirewall2_setup off
chkconfig SuSEfirewall2_init off

至此，解决问题