keepalived+haproxy高可用

環境：
主Haproxy服務器    192.168.80.100   keepalived+Haproxy
備Haproxy服務器    192.168.80.101   keepalived+Haproxy
web服務器1             192.168.80.102  httpd（nginx、tomcat）
web服務器2             192.168.80.103  httpd
80.100和80.101需要聯網

———————————————————————————————————————
在80.100虛擬機上：

systemctl stop firewalld        //關閉防火墻
setenforce 0                 //關閉監控

cd /etc/yum.repos.d/    //進入目錄
cp back/* ./         //把back里內容移動到上一個目錄
ls               //查看目錄內容

yum install -y epel-release
yum install ntp -y           //安裝ntp
ntpdate time1.aliyun.com        //同步網絡時間
date

yum install keepalived -y         //安裝keepalived
cd       //回到根目錄

vi /etc/keepalived/keepalived.conf`
刪除所有內容并添加以下內容：
! Configuration File for keepalived
global_defs {
        route_id haproxy-01
   }
vrrp_script haproxy {    定義一個熱備腳本取名為haproxy
        script "/opt/haproxy.sh"    # 檢測 haproxy 狀態的腳本路徑
        interval 2    # 檢測時間間隔
        weight 2    # 如果條件成立，權重+2
}
vrrp_instance VI_1 {
    state MASTER
    interface ens32
    virtual_router_id 51
    priority 150
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    track_script {    # 將 track_script 塊加入 instance 配置塊
        haproxy    # 檢查 HAProxy 服務是否存活
        }
    virtual_ipaddress {
        192.168.80.188
    }
}

:wq

scp /etc/keepalived/keepalived.conf root@192.168.80.101:/etc/keepalived/keepalived.conf      //把keepalived.conf傳送到80.101中
yes
root密碼

yum install lrz* -y        //安裝上傳軟件
把haproxy軟件包拉入

scp haproxy-1.5.15.tar.gz root@192.168.80.101:/root      //把haproxy軟件包傳送到80.101中
密碼

tar xf haproxy-1.5.15.tar.gz -C /opt/          //解壓haproxy軟件包
cd /opt/haproxy-1.5.15/           

源碼編譯安裝haproxy
yum install -y \
pcre-devel \
bzip2-devel \
gcc \
gcc-c++ \
make

make TARGET=linux26  PREFIX=/usr/local/haproxy    //標識64為系統
make install PREFIX=/usr/local/haproxy
mkdir /etc/haproxy          //創建目錄
cd
useradd -M -s /sbin/nologin haproxy
id  haproxy

cd /opt/haproxy-1.5.15/
cp examples/haproxy.cfg /etc/haproxy

vi /etc/haproxy/haproxy.cfg
修改以下內容：
#       chroot /usr/share/haproxy        注釋這一行
uid 1000
gid 1000
在default模塊下
統計頁面模塊內容
listen admin_stats
    bind 0.0.0.0:8089
    stats enable
    mode http
    log global
    stats uri  /stats
    stats realm Haproxy\ Statistics
    stats auth  admin:admin
    #stats hide-version
    stats admin if TRUE
    stats refresh 30s
web服務器/終端
listen webcluster
        bind 0.0.0.0:80
        mode http
        option httpchk GET /index.html
        log global
        maxconn 3000
        balance roundrobin
server web01 192.168.80.102:80 check inter 2000 fall 5
server web02 192.168.80.103:80 check inter 2000 fall 5

:wq

cd /opt/
ls

vi haproxy.sh
#!/bin/bash
if [ $(ps -C haproxy --no-header | wc -l) -eq 0 ];then
        /usr/sbin/haproxy -f /etc/haproxy/haproxy.cfg      啟動haproxy服務
fi
sleep 2     等待2秒
if [ $(ps -C haproxy --no-header | wc -l) -eq 0 ];then
        service keepalived stop
fi

   :wq        //保存退出

chmod +x /opt/haproxy.sh       //給這個文件設置權限
cd /opt/haproxy-1.5.15/
cp examples/haproxy.init /etc/init.d/haproxy
chmod +x /etc/init.d/haproxy
ll /etc/init.d/haproxy
chkconfig --add haproxy
ln -s /usr/local/haproxy/sbin/haproxy  /usr/sbin/haproxy     //軟鏈接
cat /var/log/messages

service haproxy start        //啟動服務

netstat -anpt | grep haproxy

在網頁上輸入192.168.80.100:8089/stats

scp haproxy.cfg root@192.168.80.101:/etc/haproxy/             //把haproxy.cfg 傳送到80.101虛擬機上
密碼

service haproxy stop
netstat -anpt | grep haproxy
systemctl start keepalived
ip addr show ens32
netstat -anpt | grep haproxy

——————————————————————————————————————
在80.101虛擬機上：

systemctl stop firewalld        //關閉防火墻
setenforce 0                 //關閉監控

cd /etc/yum.repos.d/    //進入目錄
cp back/* ./         //把back里內容移動到上一個目錄
ls               //查看目錄內容

yum install -y epel-release
yum install ntp -y           //安裝ntp
ntpdate time1.aliyun.com        //同步網絡時間
date

yum install keepalived -y         //安裝keepalived
cd       //回到根目錄

vi /etc/keepalived/keepalived.conf //進入成以下內容：

修改成以下內容：

ls
tar xf haproxy-1.5.15.tar.gz -C /opt/
cd /opt/haproxy-1.5.15/

源碼編譯安裝haproxy
yum install -y \
pcre-devel \
bzip2-devel \
gcc \
gcc-c++ \
make

make TARGET=linux26  PREFIX=/usr/local/haproxy    //標識64為系統
make install PREFIX=/usr/local/haproxy
mkdir /etc/haproxy
useradd -s /sbin/nologin -M  haproxy
id  haproxy

ls /etc/haproxy/
cp examples/haproxy.init /etc/init.d/haproxy
chmod +x /etc/init.d/haproxy             //給這個文件設置權限
chkconfig --add haproxy
ln -s /usr/local/haproxy/sbin/haproxy  /usr/sbin/haproxy     //軟鏈接

service haproxy start        //啟動服務
netstat -anpt | grep haproxy

service haproxy stop       //關閉服務
netstat -anpt | grep haproxy

cd /opt/
vi haproxy.sh
#!/bin/bash
#Filename:
A=$(ip addr | grep 192.168.80.188/32 | grep -v grep | wc -l)
if [ $A -gt 0 ]; then
        service haproxy start
else
        service haproxy stop
fi

   :wq

chmod +x haproxy.sh         //設置權限
ll                          
systemctl start keepalived     
ip addr show ens32
netstat -anpt | grep haproxy

————————————————————————————————————
在80.102虛擬機上：

systemctl stop firewalld      //關閉防火墻
setenforce 0          //關閉監控

yum install httpd -y        //安裝httpd

vi /etc/httpd/conf/httpd.conf
把ServerName www.example.com:80 前面的#刪除

cd /var/www/html/       //進入這個目錄
echo "<h2>server aa</h2>" > index.html
systemctl start httpd      //啟動服務

在網頁上輸入192.168.80.102

—————————————————————————————————————
在80.103虛擬機上：

systemctl stop firewalld      //關閉防火墻
setenforce 0          //關閉監控

yum install httpd -y        //安裝httpd

vi /etc/httpd/conf/httpd.conf
把ServerName www.example.com:80 前面的#刪除

cd /var/www/html/       //進入這個目錄
echo "<h2>server bb</h2>" > index.html
systemctl start httpd      //啟動服務

在網頁上輸入192.168.80.103