最近搭建K8S集群遇到ETCD的報錯，報錯信息如下，一定要關閉防火牆、iptables和SELINUX，三個都要關閉！！
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
關閉CentOS7防火牆
# 查看防火牆狀態 firewall-cmd --state # 停止firewall systemctl stop firewalld.service # 禁止firewall開機啟動 systemctl disable firewalld.service
關閉SELINUX
# 編輯SELINUX文件 vim /etc/selinux/config # 將SELINUX=enforcing改為SELINUX=disabled
清除和關閉iptables
# 清空iptables規則 iptables -F # 保存 iptables-save