keepalived的介紹
keepalived的作用是偵測伺服器的狀態,如果有一台web伺服器宕機,或工作出現故障,keepalived將會偵測到,並將故障的伺服器從系統中剔除,同時使用其他伺服器取代該伺服器的工作,當伺服器工作正常後keepalived自動將伺服器加入到伺服器群組中,這些工作全部自動完成,不需要人工干涉,需要人工做的只是修復故障的伺服器。
系統架構圖
#實作步驟
1.環境配置
1.1 安裝nginx
安裝相關依賴
yum install pcre-devel zlib zlib-devel openssl openssl-devel
上傳解壓縮壓縮套件
tar zxvf nginx-1.12.2.tar.gz
建立目錄,偵測設定
mkdir -p /usr/local/nginx ./configure --prefix=/usr/local/nginx
預先編譯與安裝
make && make install
啟動、停止相關指令
cd /usr/local/nginx/sbin/ ./nginx ./nginx -s stop ./nginx -s start
1.2 安裝keepalived
yum install -y keepalived
2.主機設定
vim /etc/keepalived/keepalived.conf
#新增的配置 vrrp_script chk_http_port { script "/shell/nginx_check.sh" #脚本地址 interval 2 #检测脚本执行的间隔 weight 2 #比重 } vrrp_instance vi_1 { state master #主服务器为master,从服务器为backup interface eth0 #网卡 virtual_router_id 51 #主、备机的virtual_router_id必须相同 priority 100 #主、备机不同的优先级,主机优先级较大,备机值较小,默认是100 advert_int 1 authentication { auth_type pass auth_pass 1111 } #虚拟ip地址 virtual_ipaddress { 192.168.126.88 } }
mkdir /shell/nginx_check.sh vim /shell/nginx_check.sh
#!/bin/bash a=`ps -c nginx –no-header |wc -l` if [ $a -eq 0 ];then /usr/local/nginx/sbin/nginx sleep 2 if [ `ps -c nginx --no-header |wc -l` -eq 0 ];then killall keepalived fi fi
3.從機設定
vrrp_instance vi_1 { state backup #主服务器为master,从服务器为backup interface eth0 #网卡 virtual_router_id 51 #主、备机的virtual_router_id必须相同 priority 50 #主、备机不同的优先级,主机优先级较大,备机值较小 advert_int 1 authentication { auth_type pass auth_pass 1111 } #虚拟ip地址 virtual_ipaddress { 192.168.126.88 } }
4.啟動服務
##啟動
service keepalived start
ip addr 1: lo: <loopback,up,lower_up> mtu 65536 qdisc noqueue state unknown link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <broadcast,multicast,up,lower_up> mtu 1500 qdisc pfifo_fast state up qlen 1000 link/ether 00:0c:29:4f:31:ce brd ff:ff:ff:ff:ff:ff inet 192.168.126.100/24 brd 192.168.126.255 scope global eth0 inet 192.168.126.88/32 scope global eth0 inet6 fe80::20c:29ff:fe4f:31ce/64 scope link valid_lft forever preferred_lft forever
關閉防火牆
service iptables stop #查看防火墙是否开机自启动 chkconfig --list | grep iptables chkconfig iptables off
http://192.168.126.88/
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