配置keepalived支持nginx高可用

實驗環境

安裝nginx

安裝nginx

yum install -y epel-*
yum install -y nginx

編寫HTML文件
nginx1上

echo -e "nginx1" > /usr/share/nginx/html/index.html

nginx2上

echo -e "nginx2" > /usr/share/nginx/html/index.html

啟動nginx

systemctl start nginx
systemctl enable nginx
firewall-cmd --zone=public --add-port=80/tcp --permanent
firewall-cmd --reload

訪問瀏覽器

安裝配置keepalived

1.安裝keepalived

yum install keepalived -y

2.在nginx1上配置keepalived
修改配置文件

vim /etc/keepalived/keepalived.conf

啟動

systemctl start keepalived
systemctl enable keepalived

3.在nginx2上配置keepalived
修改配置文件

vim /etc/keepalived/keepalived.conf

啟動

systemctl start keepalived
systemctl enable keepalived

4.在宿主機ping 192.168.204.10，使用arp -a查看緩存

5.瀏覽器訪問虛擬地址

6.在nginx1上宕掉ens33網卡

在宿主機使用arp -a查看緩存

在主機使用瀏覽器訪問虛擬地址

可以看到，對192.168.204.10的請求已從nginx1節點轉移到了nginx2節點

配置keepalived支持nginx高可用

1.編寫NGINX狀態監測腳本

編寫腳本/etc/keepalived/nginx_check.sh

#!/bin/bash
# file:/etc/keepalived/nginx_check.sh
N=`ps -C nginx --no-header | wc -l`
if [ $N -eq 0 ]; then
    systemctl restart nginx
    sleep 2
    if [ `ps -C nginx --no-header | wc -l` -eq 0 ]; then
        killall keepalived
    fi
fi

賦予可執行許可權

chmod +x /etc/keepalived/nginx_check.sh

測試腳本

2.配置keepalived支持NGINX高可用

在nginx1節點上編輯/etc/keepalived/keepalived.conf

vim /etc/keepalived/keepalived.conf

重新啟動keepalived

systemctl restart keepalived

3.測試高可用

瀏覽器訪問虛擬地址

在nginx1節點運行stop.sh腳本，然後使用瀏覽器訪問虛擬地址

#!/bin/bash
# file:stop.sh
for ((i=0; i<=100; i++))
do
    systemctl stop nginx
    echo 'stoped. sleep 1s...'
    sleep 1
done