怎么用Keepalived+HAProxy高可用集群K8S实现
今天小编给大家分享一下怎么用Keepalived+HAProxy高可用集群K8S实现的相关知识点,内容详细,逻辑清晰,相信大部分人都还太了解这方面的知识,所以分享这篇文章给大家参考一下,希望大家阅读完这篇文章后有所收获,下面我们一起来了解一下吧。
准备环境:
主机 | ip |
---|---|
k8s-master01 | 192.168.10.4 |
k8s-master02 | 192.168.10.5 |
k8s-master03 | 192.168.10.6 |
VIP | 192.168.10.150 |
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/hosts192.168.10.4 k8s-master01192.168.10.5 k8s-master02192.168.10.6 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.cfgglobal maxconn 2000 ulimit-n 16384 log 127.0.0.1 local0 err stats timeout 30sdefaults log global mode http option httplog timeout connect 5000 timeout client 50000 timeout server 50000 timeout http-request 15s timeout http-keep-alive 15sfrontend monitor-in bind *:33305 mode http option httplog monitor-uri /monitorlisten stats bind *:8006 mode http stats enable stats hide-version stats uri /stats stats refresh 30s stats realm Haproxy\ Statistics stats auth admin:adminfrontend 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-masterbackend 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-master01192.168.10.4:6443 check server k8s-master02192.168.10.5:6443 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 keepalivedglobal_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_class="lazy" data-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 keepalivedglobal_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_class="lazy" data-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 keepalivedglobal_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_class="lazy" data-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/basherr=0for 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 fidoneif [[ $err != "0" ]]; then echo "systemctl stop keepalived" /usr/bin/systemctl stop keepalived exit 1else exit 0fi
启动haproxy与keepalived服务
systemctl daemon-reload systemctl enable --now haproxysystemctl enable --now keepalived
可以用ping和telnet命令测试一下vip的可用性
ping 192.168.10.150PING 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 ms64 bytes from 192.168.10.150: icmp_seq=2 ttl=64 time=0.519 ms64 bytes from 192.168.10.150: icmp_seq=3 ttl=64 time=0.874 ms64 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 3009msrtt min/avg/max/mdev = 0.519/0.946/1.606/0.403 mstelnet 192.168.10.150 16443Trying 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
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