集羣介紹，keepalived配置

原創 xinghun1227 2019-02-22 21:00

集羣介紹

集羣介紹，keepalived配置

keepalived介紹

集羣介紹，keepalived配置

用keepalived配置高可用集羣

集羣介紹，keepalived配置

1.兩臺機器都安裝軟件：

[root@weixing01 ~]# yum install -y keepalived
已加載插件：fastestmirror
base                                                                          | 3.6 kB  00:00:00     
epel/x86_64/metalink                                                          | 7.8 kB  00:00:00     
epel                                                                          | 4.7 kB  00:00:00     
extras                                                                        | 3.4 kB  00:00:00     
updates                                                                       | 3.4 kB  00:00:00     
(1/3): extras/7/x86_64/primary_db                                             | 185 kB  00:00:01     
(2/3): epel/x86_64/updateinfo                                                 | 908 kB  00:00:03     
(3/3): epel/x86_64/primary_db                                                 | 6.3 MB  00:00:07

2.使用nginx作爲測試：

[root@weixing01 ~]# yum install -y nginx

3.編輯主配置文件：

[root@weixing01 ~]# vim !$
vim /etc/keepalived/keepalived.conf

global_defs {
   notification_email {
     [email protected]                             #告警郵箱
   }
   notification_email_from [email protected]
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}
vrrp_script chk_nginx {
    script "/usr/local/sbin/check_ng.sh"                #檢查腳本
    interval 3
}
vrrp_instance VI_1 {
    state MASTER                             #主模塊
    interface ens33
    virtual_router_id 51                      #id主從保持一致
    priority 100                                    #權重不同
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass aminglinux>com            #認證密碼
    }
    virtual_ipaddress {
        192.168.188.100                          #vip地址
    }
    track_script {
        chk_nginx
    }
}

4.定義腳本：

[root@weixing01 ~]# vim /usr/local/sbin/check_ng.sh

#!/bin/bash
#時間變量，用於記錄日誌
d=`date --date today +%Y%m%d_%H:%M:%S`
#計算nginx進程數量
n=`ps -C nginx --no-heading|wc -l`
#如果進程爲0，則啓動nginx，並且再次檢測nginx進程數量，
#如果還爲0，說明nginx無法啓動，此時需要關閉keepalived
if [ $n -eq "0" ]; then
        /etc/init.d/nginx start
        n2=`ps -C nginx --no-heading|wc -l`
        if [ $n2 -eq "0"  ]; then
                echo "$d nginx down,keepalived will stop" >> /var/log/check_ng.log
                systemctl stop keepalived
        fi
fi

5.變更腳本權限：

[root@weixing01 ~]# chmod 755 /usr/local/sbin/check_ng.sh

6.啓動服務並檢測：

[root@weixing01 ~]# systemctl start keepalived.service 
[root@weixing01 ~]# ps aux |grep keep
root       1569  0.0  0.1 120740  1400 ?        Ss   21:47   0:00 /usr/sbin/keepalived -D
root       1570  0.0  0.3 127476  3276 ?        S    21:47   0:00 /usr/sbin/keepalived -D
root       1571  0.5  0.3 131780  3104 ?        S    21:47   0:00 /usr/sbin/keepalived -D
root       1598  0.0  0.0 112676   984 pts/0    R+   21:47   0:00 grep --color=auto keep

7.Nginx服務會自動啓動：

[root@weixing01 ~]# ps aux |grep nginx
root        900  0.0  0.1  45988  1284 ?        Ss   21:10   0:00 nginx: master process /usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf
nobody      913  0.0  0.4  48476  4184 ?        S    21:10   0:00 nginx: worker process
nobody      914  0.0  0.3  48476  3924 ?        S    21:10   0:00 nginx: worker process
root       1660  0.0  0.0 112676   984 pts/0    R+   21:48   0:00 grep --color=auto nginx
[root@weixing01 ~]# /etc/init.d/nginx stop
Stopping nginx (via systemctl):                            [  確定  ]
[root@weixing01 ~]# ps aux |grep nginx
root       1762  0.0  0.1  45988  1296 ?        Ss   21:48   0:00 nginx: master process /usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf
nobody     1766  0.0  0.4  48476  4200 ?        S    21:48   0:00 nginx: worker process
nobody     1767  0.0  0.3  48476  3940 ?        S    21:48   0:00 nginx: worker process
root       1775  0.0  0.0 112676   984 pts/0    R+   21:48   0:00 grep --color=auto nginx

8.關閉防火牆：

[root@weixing01 ~]# iptables -nvL
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination         

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination         

Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination         
[root@weixing01 ~]# getenforce
Disabled

9.配置從上的配置文件：

[root@weixing01 ~]# vim /etc/keepalived/keepalived.conf 

global_defs {
   notification_email {
     [email protected]
   }
   notification_email_from [email protected]
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}
vrrp_script chk_nginx {
    script "/usr/local/sbin/check_ng.sh"
    interval 3
}
vrrp_instance VI_1 {
    state BACKUP
    interface ens33
    virtual_router_id 51
    priority 90
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass aminglinux>com
    }
    virtual_ipaddress {
        192.168.188.100
    }
    track_script {
        chk_nginx
    }
}

10.寫從上的檢測腳本：

[root@weixing01 ~]# vim /usr/local/sbin/check_ng.sh

#時間變量，用於記錄日誌
d=`date --date today +%Y%m%d_%H:%M:%S`
#計算nginx進程數量
n=`ps -C nginx --no-heading|wc -l`
#如果進程爲0，則啓動nginx，並且再次檢測nginx進程數量，
#如果還爲0，說明nginx無法啓動，此時需要關閉keepalived
if [ $n -eq "0" ]; then
        systemctl start nginx
        n2=`ps -C nginx --no-heading|wc -l`
        if [ $n2 -eq "0"  ]; then
                echo "$d nginx down,keepalived will stop" >> /var/log/check_ng.log
                systemctl stop keepalived
        fi
fi

11.更改腳本權限：

[root@weixing01 ~]# chmod 755 !$
chmod 755 /usr/local/sbin/check_ng.sh

12.啓動從上的服務：

[root@weixing01 ~]# systemctl start keepalived.service 
[root@weixing01 ~]# ps aux |grep keep
root       1476  0.0  0.1 120740  1408 ?        Ss   21:59   0:00 /usr/sbin/keepalived -D
root       1477  0.0  0.2 122812  2376 ?        S    21:59   0:00 /usr/sbin/keepalived -D
root       1478  0.0  0.2 122812  2392 ?        S    21:59   0:00 /usr/sbin/keepalived -D
root       1485  0.0  0.0 112676   980 pts/0    R+   21:59   0:00 grep --color=auto keep

13.主從ip地址默認訪問的路徑：

主

[root@weixing01 ~]# cat /data/wwwroot/default/index.html

從

[root@weixing01 ~]# cat /usr/share/nginx/html/index.html

14.測試高可用：

主上面增加防火牆規則

[root@weixing01 ~]# iptables -I OUTPUT -p vrrp -j DROP

測試後發現還可以繼續訪問，沒有達到目的，刪掉防火牆

[root@weixing01 ~]# iptables -F
[root@weixing01 ~]# iptables -nvL
Chain INPUT (policy ACCEPT 12 packets, 952 bytes)
 pkts bytes target     prot opt in     out     source               destination         

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination         

Chain OUTPUT (policy ACCEPT 10 packets, 928 bytes)
 pkts bytes target     prot opt in     out     source               destination

停止主上的keepalived服務：vip不在住上監聽了

[root@weixing01 ~]# systemctl stop keepalived.service 
[root@weixing01 ~]# ip add
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:ed:fb:e6 brd ff:ff:ff:ff:ff:ff
    inet 192.168.188.130/24 brd 192.168.188.255 scope global ens33
       valid_lft forever preferred_lft forever
    inet 192.168.188.150/24 brd 192.168.188.255 scope global secondary ens33:0
       valid_lft forever preferred_lft forever
    inet6 fe80::9835:40a7:677a:8a07/64 scope link 
       valid_lft forever preferred_lft forever
3: ens37: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:ed:fb:f0 brd ff:ff:ff:ff:ff:ff

100已經在從上面監聽了。

[root@weixing01 ~]# tail /var/log/messages
Apr  9 22:43:13 weixing01 Keepalived_vrrp[8730]: Sending gratuitous ARP on ens37 for 1
Apr  9 22:43:13 weixing01 Keepalived_vrrp[8730]: Sending gratuitous ARP on ens37 for 1
Apr  9 22:43:13 weixing01 Keepalived_vrrp[8730]: Sending gratuitous ARP on ens37 for 1
Apr  9 22:43:13 weixing01 Keepalived_vrrp[8730]: Sending gratuitous ARP on ens37 for 1
Apr  9 22:43:18 weixing01 Keepalived_vrrp[8730]: Sending gratuitous ARP on ens37 for 1
Apr  9 22:43:18 weixing01 Keepalived_vrrp[8730]: VRRP_Instance(VI_1) Sending/queueing 
Apr  9 22:43:18 weixing01 Keepalived_vrrp[8730]: Sending gratuitous ARP on ens37 for 1
Apr  9 22:43:18 weixing01 Keepalived_vrrp[8730]: Sending gratuitous ARP on ens37 for 1
Apr  9 22:43:18 weixing01 Keepalived_vrrp[8730]: Sending gratuitous ARP on ens37 for 1
Apr  9 22:43:18 weixing01 Keepalived_vrrp[8730]: Sending gratuitous ARP on ens37 for 1
[root@weixing01 ~]# ip add
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast state DOWN qlen 1000
    link/ether 00:0c:29:ca:b5:ec brd ff:ff:ff:ff:ff:ff
    inet 192.168.188.132/24 brd 192.168.188.255 scope global ens33
       valid_lft forever preferred_lft forever
    inet 192.168.188.150/24 brd 192.168.188.255 scope global secondary ens33:0
       valid_lft forever preferred_lft forever
    inet6 fe80::b378:2446:305f:e06c/64 scope link tentative 
       valid_lft forever preferred_lft forever
3: ens37: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:ca:b5:f6 brd ff:ff:ff:ff:ff:ff
    inet 192.168.188.129/24 brd 192.168.188.255 scope global dynamic ens37
       valid_lft 1200sec preferred_lft 1200sec
    inet 192.168.188.100/32 scope global ens37
       valid_lft forever preferred_lft forever
    inet6 fe80::6b14:823d:f9c7:1cdc/64 scope link 
       valid_lft forever preferred_lft forever
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