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Keepalived如何實現Nginx高可用
瀏覽：239日期：2023-03-13 15:37:24
目錄
- Keepalived實現Nginx高可用
- Master上的keepalived.conf
- Backup上的keepalived.conf
- Nginx檢測腳本check_nginx.sh
- Keepalived+Nginx高可用集群
Keepalived實現Nginx高可用
Keepalived安裝可參考Mysql+Keepalived實現雙主熱備
Master上的keepalived.conf
global_defs {
?? ?router_id LVS_LEVEL1?? ?#主服務器名稱
}
?
vrrp_script check_run {
? ?script "/usr/local/src/check_nginx.sh"
? ?interval 5?? ??? ??? ??? ?#5秒執行一次腳本
}
?
vrrp_instance VI_1 {
? ? state MASTER?? ??? ??? ?#主服務器
? ? interface eth0?? ??? ??? ?#承載VIP地址到物理接口
? ? virtual_router_id 51?? ?#虛擬路由器ID號，每個熱播組保持一致
? ? priority 100?? ??? ??? ?#優先級，數值越大優先級越高
? ? advert_int 1?? ??? ??? ?#檢查間隔，默認為1s
? ? authentication {?? ??? ?#認證信息，每個熱播組保持一致
? ? ? ? auth_type PASS ? ? ?#認證類型
? ? ? ? auth_pass 1111?? ??? ?#密碼字串
? ? }
? ? virtual_ipaddress {
? ? ? ? 192.168.0.200?? ??? ?#VIP地址（內網地址）
? ? }
? ? track_script {
? ? ? ? check_run
? ? }
}
Backup上的keepalived.conf
global_defs {
?? ?router_id LVS_LEVEL2?? ?#備份服務器名稱
}
vrrp_script check_run {
?? ?script "/usr/local/src/check_nginx.sh"
?? ?interval 5?? ??? ??? ??? ?#5秒執行一次腳本
}
vrrp_instance VI_1 {
? ? state BACKUP?? ??? ??? ?#備份服務器
? ? interface eth0?? ??? ??? ?#承載VIP地址到物理接口
? ? virtual_router_id 51?? ?#虛擬路由器ID號，每個熱播組保持一致
? ? priority 50?? ??? ??? ??? ?#優先級，數值越大優先級越高
? ? advert_int 1?? ??? ??? ?#檢查間隔，默認為1s
? ? authentication {?? ??? ?#認證信息，每個熱播組保持一致
? ? ? ? auth_type PASS ? ? ?#認證類型
? ? ? ? auth_pass 1111?? ??? ?#密碼字串
? ? }
? ? virtual_ipaddress {
? ? ? ? 192.168.0.200 ? ? ? #VIP地址（和主服務器設置一樣）
? ? }
? ? track_script {
? ? ? ? check_run
? ? }
}
Nginx檢測腳本check_nginx.sh
#!/bin/bash ? A=`ps -C nginx --no-header |wc -l` #判斷nginx是否宕機，如果宕機，嘗試重啟 if [ $A -eq 0 ];then ? ? /usr/local/nginx/sbin/nginx ? ? #等待一會再次檢查nginx，如果沒有啟動成功，則停止keepalived，使其啟動備用機 ? ? sleep 5 ? ? if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then ? ? ? ? killall keepalived ? ? fi fi
chmod +x /etc/keepalived/nginx_check.sh
Keepalived+Nginx高可用集群
實驗環境
準備2臺設備
設備1 192.168.217.11 nginx +keepalived
設備2 192.168.217.12 nginx +keepalived
虛擬ip 192.168.217.3
設備1、2 安裝nginx keepalived
（此處設備已安裝nginx）
我們在此基礎上直接利用yum安裝keepalived
更新網絡yum源
[root@localhost ~]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo [root@localhost ~]# wget -O /etc/yum.repos.d/epel-7.repo http://mirrors.aliyun.com/repo/epel-7.repo --2022-06-11 17:56:31-- ?http://mirrors.aliyun.com/repo/epel-7.repo
安裝keepalived
[root@localhost ~]# yum -y install keepalived.x86_64?
啟動nginx
[root@localhost ~]# cd /usr/src/nginx-1.12.2/ [root@localhost nginx-1.12.2]# killall -9 nginx [root@localhost nginx-1.12.2]# nginx
修改keepalived配置文件
[root@localhost nginx-1.12.2]# vim /etc/keepalived/keepalived.conf?
vrrp_instance VI_1 { ??
? ? state BACKUP ? ? ? ? ? ?#主調度器的初始角色（本實驗主備MASTER 從BACKUP）
? ? interface ens33 ? ? ? ? ? ?#修改網卡名稱
? ? virtual_router_id 52 ? ? ?#主id 與從id ?不要重復 ? ??
? ? priority 90 ? ? ? ? ? ? ? ? #主調度器的選舉優先級 ? （本實驗 ?主備100 ?從90 ?數據越大 優先級越高）
? ? advert_int 1 ? ? ? ? ? ?
? ? authentication {
? ? ? ? auth_type PASS
? ? ? ? auth_pass 1111
? ? }
? ? virtual_ipaddress {
? ? ? ? 192.168.217.3 ? ? ? ? ? ? ? ? ? ? ?#虛擬ip ? （本實驗需設置 ?同網段 ?主從一樣）
? ? }
}
查看ip
[root@localhost ~]# ip a 2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 ? ? link/ether 00:0c:29:c2:15:cf brd ff:ff:ff:ff:ff:ff ? ? inet 192.168.217.11/24 brd 192.168.217.255 scope global noprefixroute ens33 ? ? ? ?valid_lft forever preferred_lft forever ? ? inet 192.168.217.3/32 scope global ens33 ? ? ? ?valid_lft forever preferred_lft forever ? ? inet6 fe80::1e6f:d3ee:5554:1f34/64 scope link tentative noprefixroute dadfailed? ? ? ? ?valid_lft forever preferred_lft forever ? ? inet6 fe80::ac8:77ad:9154:7983/64 scope link noprefixroute? ? ? ? ?valid_lft forever preferred_lft forever
重啟keepalived
[root@localhost ~]# systemctl start keepalived.service [root@localhost ~]# systemctl restart keepalived.service
關閉防火墻 內核
[root@localhost ~]# systemctl stop firewalld [root@localhost ~]# setenforce 0
驗證
[root@localhost ~]# curl 192.168.217.11 ‘nginx1" [root@localhost ~]# curl 192.168.217.12 ‘nginx2" [root@localhost ~]# curl 192.168.217.3 ‘nginx1" [root@localhost ~]# curl 192.168.217.3 ‘nginx1"
實驗環境
準備2臺設備 雙主keepalived
設備1 192.168.217.11 nginx +keepalived
設備2 192.168.217.12 nginx +keepalived
虛擬ip 192.168.217.3
虛擬ip 192.168.217.6
在以上實驗基礎上
設備1
[root@localhost ~]# vim /etc/keepalived/keepalived.conf
vrrp_instance VI_1 { #修改模塊名字
state MASTER #主調度器的初始角色（本實驗主備MASTER 從BACKUP）
interface ens33 #修改網卡名稱
virtual_router_id 51 #主id 與從id 不要重復
priority 100 #主調度器的選舉優先級 （本實驗 主備100 從90 數據越大 優先級越高）
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.217.3 #虛擬ip
}
}
vrrp_instance VI_2 {
state BACKUP
interface ens33
virtual_router_id 53
priority 90
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.217.6
}
I}
設備2
[root@localhost ~]# vim /etc/keepalived/keepalived.conf
vrrp_instance VI_1 {
state BACKUP
interface ens33
virtual_router_id 51
priority 90
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.217.3
}
}
vrrp_instance VI_2 {
state MASTER
interface ens33
virtual_router_id 53
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.217.6
}
}
xshell同時開啟 命令模式 重啟keepalived
[root@localhost ~]# systemctl start keepalived.service [root@localhost ~]# systemctl restart keepalived.service
查看ip
設備1 飄逸Ip正常
[root@localhost ~]# ip a
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:c2:15:cf brd ff:ff:ff:ff:ff:ff
inet 192.168.217.11/24 brd 192.168.217.255 scope global noprefixroute ens33
valid_lft forever preferred_lft forever
inet 192.168.217.3/32 scope global ens33
valid_lft forever preferred_lft forever
inet6 fe80::1e6f:d3ee:5554:1f34/64 scope link tentative noprefixroute dadfailed
valid_lft forever preferred_lft forever
inet6 fe80::ac8:77ad:9154:7983/64 scope link noprefixroute
valid_lft forever preferred_lft forever
設備2
[root@localhost ~]# ip a
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:49:b3:a1 brd ff:ff:ff:ff:ff:ff
inet 192.168.217.12/24 brd 192.168.217.255 scope global noprefixroute ens33
valid_lft forever preferred_lft forever
inet 192.168.217.6/32 scope global ens33
valid_lft forever preferred_lft forever
inet6 fe80::1e6f:d3ee:5554:1f34/64 scope link noprefixroute
valid_lft forever preferred_lft forever
設備1、設備2驗證 （此問題暫未解決）
[root@localhost ~]# curl 192.168.217.11 curl: (7) Failed connect to 192.168.217.11:80; 拒絕連接 [root@localhost ~]# curl 192.168.217.12 ‘nginx2" [root@localhost ~]# curl 192.168.217.3 curl: (7) Failed connect to 192.168.217.3:80; 連接超時 [root@localhost ~]# curl 192.168.217.6 curl: (7) Failed connect to 192.168.217.6:80; 連接超時
以上為個人經驗，希望能給大家一個參考，也希望大家多多支持。
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Nginx
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