防火墙配置
firewall-cmd --direct --permanent --add-rule ipv4 filter INPUT 0 --in-interface ens33 --destination 224.0.0.18 --protocol vrrp -j ACCEPT
firewall-cmd --zone=public --add-port=8080/tcp --permanent
firewall-cmd --zone=public --add-port=18010/tcp --permanent
firewall-cmd --reload
或
systemctl disable firewalld
systemctl stop firewalld
关闭selinux
vi /etc/sysconfig/selinux
SELINUX=disabled
setenforce 0
getenforce
启动测试WEB服务
yum install nc
vi index.html
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Test Page</title>
</head>
<body>
<h1>It Works!</h1>
</body>
</html>
while true;do { printf '%b\r\n' 'HTTP/1.1 200 OK' '%b\r\n';cat index.html; }|nc -l 8080;done
安装haproxy
yum install -y haproxy
配置haproxy
vi /etc/haproxy/haproxy.cfg
global
user haproxy
group haproxy
daemon
maxconn 4096
defaults
mode tcp
balance roundrobin #leastconn
timeout client 30000ms
timeout server 30000ms
timeout connect 3000ms
retries 3
frontend fr_server1
bind 0.0.0.0:18010
default_backend bk_server1
backend bk_server1
server srv1 10.211.55.11:8080
server srv2 10.211.55.12:8080
listen stats
mode http
bind *:9090
stats enable
stats refresh 3s
stats uri /
stats auth admin:123456
stats admin if TRUE
启动haproxy
systemctl enable haproxy
systemctl start haproxy
安装keepalived
yum install keepalived ipset-libs libnl3-devel psmisc
配置keepalived
vi /etc/keepalived/keepalived.conf
vrrp_script chk_proc {
script "killall -0 haproxy" # check the haproxy process
interval 2 # every 2 seconds
weight 2 # add 2 points if OK
}
vrrp_instance VI_1 {
interface eth0 # interface to monitor
state MASTER # MASTER on haproxy1, BACKUP on haproxy2
virtual_router_id 51
priority 101 # 101 on haproxy1, 100 on haproxy2
virtual_ipaddress {
10.211.55.100/24 # virtual ip address
}
track_script {
chk_proc
}
}
启动keepalived
systemctl enable keepalived
systemctl start keepalived
查看日志
tail -f /var/log/messages
参考文档
- http://www.keepalived.org/manpage.html
- http://seanlook.com/2015/05/18/nginx-keepalived-ha/
- https://qizhanming.com/blog/2018/05/17/how-to-config-keepalived-on-centos-7
- https://www.certdepot.net/rhel7-configure-high-available-load-balancer/
- https://stackoverflow.com/questions/39016291/haproxy-loadbalancing-tcp-traffic
- https://www.jianshu.com/p/c9f6d55288c0
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