安装keepalived
yum -y install keepalivedcat > /etc/keepalived/keepalived.conf << EOF
! Configuration File for keepalived
global_defs {
router_id LVS_DEVEL
}
vrrp_script chk_haproxy {
script "killall -0 haproxy"
interval 2
weight -3
fall 1
rise 2
timeout 2
}
vrrp_instance VI_1 {
state MASTER # 其他节点为BACKUP
interface ens5f0 # 网卡
virtual_router_id 60 # id与其他keepalived节点一致
priority 100 # 初始化权重，一致即可，不影响
advert_int 1
authentication {
auth_type PASS
auth_pass 1111 # 密码与其他keepalived节点一致
}
unicast_src_ip 172.25.2.4 # 本机ip
unicast_peer {
172.25.2.5 # 其他keepalived节点ip
172.25.2.6
}
virtual_ipaddress {
172.25.2.50 # vip
}
track_script {
chk_haproxy
}
}
EOF注释的地方，按需求修改
我这里的配置文件只需要修改如下
stateMASTER改为BACKUP
unicast_src_ip修改为本机IP
unicast_peer修改为其他keepalived节点（其他master节点）其他位置不用动。
安装HAProxy
yum -y install haproxycat > /etc/haproxy/haproxy.cfg <<EOF
#---------------------------------------------------------------------
# Example configuration for a possible web application. See the
# full configuration options online.
#
# https://www.haproxy.org/download/1.8/doc/configuration.txt
#
#---------------------------------------------------------------------
#---------------------------------------------------------------------
# Global settings
#---------------------------------------------------------------------
global
# to have these messages end up in /var/log/haproxy.log you will
# need to:
#
# 1) configure syslog to accept network log events. This is done
# by adding the '-r' option to the SYSLOGD_OPTIONS in
# /etc/sysconfig/syslog
#
# 2) configure local2 events to go to the /var/log/haproxy.log
# file. A line like the following can be added to
# /etc/sysconfig/syslog
#
# local2.* /var/log/haproxy.log
#
log 127.0.0.1 local2
chroot /var/lib/haproxy
pidfile /var/run/haproxy.pid
maxconn 4000
user haproxy
group haproxy
daemon
# turn on stats unix socket
stats socket /var/lib/haproxy/stats
# utilize system-wide crypto-policies
ssl-default-bind-ciphers PROFILE=SYSTEM
ssl-default-server-ciphers PROFILE=SYSTEM
#---------------------------------------------------------------------
# common defaults that all the 'listen' and 'backend' sections will
# use if not designated in their block
#---------------------------------------------------------------------
defaults
mode http
log global
option httplog
option dontlognull
option http-server-close
option forwardfor except 127.0.0.0/8
option redispatch
retries 3
timeout http-request 10s
timeout queue 1m
timeout connect 10s
timeout client 1m
timeout server 1m
timeout http-keep-alive 10s
timeout check 10s
maxconn 3000
#---------------------------------------------------------------------
# main frontend which proxys to the backends
#---------------------------------------------------------------------
frontend apisever
# 监听8443端口
bind *:8443
mode tcp
option tcplog
default_backend apiserver
#---------------------------------------------------------------------
# round robin balancing between the various backends
#---------------------------------------------------------------------
backend apiserver
option httpchk GET /healthz
http-check expect status 200
mode tcp
option ssl-hello-chk
balance roundrobin
# apiserver节点
server k8s-master01 172.25.2.4:6443 check
server k8s-master02 172.25.2.5:6443 check
server k8s-master03 172.25.2.6:6443 check
EOF以上配置文件在master节点一致即可，不用额外修改
开启并开机自启
systemctl enable keepalived --now
systemctl enable haproxy --now验证vip漂移
systemctl stop haproxy
# 5秒后漂移到其他节点