Keepalived+HAProxy高可用集群K8S实现

本文采用Keepalived+HAProxy的方式构建高可用集群。

当你如果你有硬件负载均衡设备当然更好了。

准备环境：

主机ipk8s-master01192.168.10.4k8s-master02192.168.10.5k8s-master03192.168.10.6VIP192.168.10.150

架构图

注意：master集群采用奇数台数，3、5、7…

所有节点都进行hosts文件解析

tail -3 /etc/hosts 192.168.10.4 k8s-master01 192.168.10.5 k8s-master02 192.168.10.6 k8s-master03

所有节点都要安装keepalived和haproxy软件

yum -y install haproxy keepalived

修改haproxy配置文件（所有节点配置相同）

最好选择2.x版本，当然这个版本也不影响使用，只是功能没有2.x版本多

vim /etc/haproxy/haproxy.cfg global maxconn 2000 ulimit-n 16384 log 127.0.0.1 local0 err stats timeout 30s defaults log global mode http option httplog timeout connect 5000 timeout client 50000 timeout server 50000 timeout http-request 15s timeout http-keep-alive 15s frontend monitor-in bind *:33305 mode http option httplog monitor-uri /monitor listen stats bind *:8006 mode http stats enable stats hide-version stats uri /stats stats refresh 30s stats realm Haproxy Statistics stats auth admin:admin frontend k8s-master bind 0.0.0.0:16443 bind 127.0.0.1:16443 mode tcp option tcplog tcp-request inspect-delay 5s default_backend k8s-master backend k8s-master mode tcp option tcplog option tcp-check balance roundrobin default-server inter 10s downinter 5s rise 2 fall 2 slowstart 60s maxconn 250 maxqueue 256 weight 100 server k8s-master01 192.168.10.4:6443 check server k8s-master02 192.168.10.5:6443 check server k8s-master03 192.168.10.6:6443 check

master01节点修改keepalived配置文件

vim /etc/keepalived/keepalived.conf ! Configuration File for keepalived global_defs { router_id LVS_DEVEL } vrrp_script chk_apiserver { script “/etc/keepalived/check_apiserver.sh” interval 2 weight -5 fall 3 rise 2 } vrrp_instance VI_1 { state MASTER interface eth0 mcast_src_ip 192.168.10.4 virtual_router_id 51 priority 100 advert_int 2 authentication { auth_type PASS auth_pass K8SHA_KA_AUTH } virtual_ipaddress { 192.168.10.150/24 } track_script { chk_apiserver }

master02节点修改keepalived配置文件

vim /etc/keepalived/keepalived.conf ! Configuration File for keepalived global_defs { router_id LVS_DEVEL } vrrp_script chk_apiserver { script “/etc/keepalived/check_apiserver.sh” interval 2 weight -5 fall 3 rise 2 } vrrp_instance VI_1 { state BACKUP interface eth0 mcast_src_ip 192.168.10.5 virtual_router_id 51 priority 50 advert_int 2 authentication { auth_type PASS auth_pass K8SHA_KA_AUTH } virtual_ipaddress { 192.168.10.150/24 } track_script { chk_apiserver } }

master03节点修改keepalived配置文件

vim /etc/keepalived/keepalived.conf ! Configuration File for keepalived global_defs { router_id LVS_DEVEL } vrrp_script chk_apiserver { script “/etc/keepalived/check_apiserver.sh” interval 2 weight -5 fall 3 rise 2 } vrrp_instance VI_1 { state BACKUP interface eth0 mcast_src_ip 192.168.10.6 virtual_router_id 51 priority 50 advert_int 2 authentication { auth_type PASS auth_pass K8SHA_KA_AUTH } virtual_ipaddress { 192.168.10.150/24 } track_script { chk_apiserver } }

所有节点创建健康检查脚本

vim /etc/keepalived/check_apiserver.sh #!/bin/bash err=0 for k in $(seq 1 5) do check_code=$(pgrep haproxy) if [[ $check_code == “” ]]; then err=$(expr $err + 1) sleep 5 continue else err=0 break fi done if [[ $err != “0” ]]; then echo “systemctl stop keepalived” /usr/bin/systemctl stop keepalived exit 1 else exit 0 fi

启动haproxy与keepalived服务

systemctl daemon-reload systemctl enable –now haproxy systemctl enable –now keepalived

可以用ping和telnet命令测试一下vip的可用性

ping 192.168.10.150 PING 192.168.10.150 (192.168.10.150) 56(84) bytes of data. 64 bytes from 192.168.10.150: icmp_seq=1 ttl=64 time=1.60 ms 64 bytes from 192.168.10.150: icmp_seq=2 ttl=64 time=0.519 ms 64 bytes from 192.168.10.150: icmp_seq=3 ttl=64 time=0.874 ms 64 bytes from 192.168.10.150: icmp_seq=4 ttl=64 time=0.786 ms ^C — 192.168.10.150 ping statistics — 4 packets transmitted, 4 received, 0% packet loss, time 3009ms rtt min/avg/max/mdev = 0.519/0.946/1.606/0.403 ms telnet 192.168.10.150 16443 Trying 192.168.10.150… Connected to 192.168.10.150. Escape character is ^]. Connection closed by foreign host.

再尝试一下断开vip所在节点的keepalived，看ip是否漂移，如果vip漂移至另一节点则代表成功

可能难免有地方出错，如果出错可以留言哈

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