搭建K8S集群遇到ETCD的报错，报错信息如下，
##一定要关闭防火墙、iptables和SELINUX，三个都要关闭！！
Mar 26 20:39:24 k8s-m1 etcd[6437]: health check for peer 3de62d4888b330ab could not connect: dial tcp 192.168.26.137:2380: connect: no route to host (prober “ROUND_TRIPPER_SNAPSHOT”)
Mar 26 20:39:24 k8s-m1 etcd[6437]: health check for peer 3de62d4888b330ab could not connect: dial tcp 192.168.26.137:2380: connect: no route to host (prober “ROUND_TRIPPER_RAFT_MESSAGE”)
Mar 26 20:39:24 k8s-m1 etcd[6437]: health check for peer c6f4c021208d2dfe could not connect: dial tcp 192.168.26.136:2380: i/o timeout (prober “ROUND_TRIPPER_SNAPSHOT”)
Mar 26 20:39:24 k8s-m1 etcd[6437]: health check for peer c6f4c021208d2dfe could not connect: dial tcp 192.168.26.136:2380: i/o timeout (prober “ROUND_TRIPPER_RAFT_MESSAGE”)
Mar 26 20:39:24 k8s-m1 etcd[6437]: publish error: etcdserver: request timed out

关闭CentOS7防火墙

查看防火墙状态

firewall-cmd --state

停止firewall

systemctl stop firewalld.service

禁止firewall开机启动

systemctl disable firewalld.service

关闭SELINUX

编辑SELINUX文件

vim /etc/selinux/config

将SELINUX=enforcing改为SELINUX=disabled

清除和关闭iptables

清空iptables规则

iptables -F

保存

iptables-save