Nginx Keepalived双机主备配置

其他 2021-03-01 21:51:33 阅读次数: 0

1 双机主备原理

双机主备，是为了处理当Nginx主服务器宕机之后，会启动备用服务器进行服务，从而实现框架的高可用。

在这里插入图片描述

2 主机配置

2.1 查看网卡名称

inet 192.168.51.6/24 brd 192.168.51.255 scope global ens33

ens33 就是网卡名称

[root@localhost ~]# ip addr
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 00:50:56:26:f8:57 brd ff:ff:ff:ff:ff:ff
    inet 192.168.51.6/24 brd 192.168.51.255 scope global ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::250:56ff:fe26:f857/64 scope link 
       valid_lft forever preferred_lft forever
3: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN 
    link/ether 02:42:49:a9:d2:94 brd ff:ff:ff:ff:ff:ff
    inet 172.17.0.1/16 scope global docker0
       valid_lft forever preferred_lft forever

2.2 修改配置文件

[root@localhost ~]# cd /etc/keepalived
[root@localhost keepalived]# vi keepalived.conf

global_defs {
	# 路由id：当前安装keepalived的节点主机标识符，保证全局唯一
	router_id keep_5
} v
rrp_instance VI_1 {
	# 表示状态是MASTER主机还是备用机BACKUP
	state MASTER
	# 该实例绑定的网卡
	interface ens33
	# 保证主备节点一致即可
	virtual_router_id 51
	# 权重，master权重一般高于backup，如果有多个，那就是选举，谁的权重高，谁就当选
	priority 100
	# 主备之间同步检查时间间隔，单位秒
	advert_int 2
	# 认证权限密码，防止非法节点进入
authentication {
	auth_type PASS
	auth_pass 1111
} 
#	虚拟出来的ip，可以有多个（vip）
virtual_ipaddress {
	192.168.51.101
	}
}

2.3 启动服务

[root@localhost ~]# cd /usr/local/keepalived/sbin/
[root@localhost sbin]# ./keepalived

2.4 查看运行

[root@localhost sbin]# ps -ef | grep keepalived
root      10384      1  0 16:11 ?        00:00:00 ./keepalived
root      10385  10384  0 16:11 ?        00:00:00 ./keepalived
root      10387   3963  0 16:12 pts/1    00:00:00 grep --color=auto keepalived
[root@localhost sbin]# ip addr
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 00:50:56:37:75:55 brd ff:ff:ff:ff:ff:ff
    inet 192.168.51.5/24 brd 192.168.51.255 scope global ens33
       valid_lft forever preferred_lft forever
    inet 192.168.51.101/32 scope global ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::250:56ff:fe37:7555/64 scope link 
       valid_lft forever preferred_lft forever
3: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN 
    link/ether 02:42:99:71:38:eb brd ff:ff:ff:ff:ff:ff
    inet 172.17.0.1/16 scope global docker0
       valid_lft forever preferred_lft forever

3 备用机配置

3.1 查看网卡名称

inet 192.168.51.6/24 brd 192.168.51.255 scope global ens33

ens33 就是网卡名称

[root@localhost ~]# ip addr
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 00:50:56:26:f8:57 brd ff:ff:ff:ff:ff:ff
    inet 192.168.51.6/24 brd 192.168.51.255 scope global ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::250:56ff:fe26:f857/64 scope link 
       valid_lft forever preferred_lft forever
3: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN 
    link/ether 02:42:49:a9:d2:94 brd ff:ff:ff:ff:ff:ff
    inet 172.17.0.1/16 scope global docker0
       valid_lft forever preferred_lft forever

3.2 修改配置文件

[root@localhost ~]# cd /etc/keepalived
[root@localhost keepalived]# vi keepalived.conf

global_defs {
	# 路由id：当前安装keepalived的节点主机标识符，保证全局唯一
	router_id keep_6
} v
rrp_instance VI_1 {
	# 表示状态是MASTER主机还是备用机BACKUP
	state BACKUP
	# 该实例绑定的网卡
	interface ens33
	# 保证主备节点一致即可
	virtual_router_id 51
	# 权重低于MASTER
	priority 80
	# 主备之间同步检查时间间隔，单位秒
	advert_int 2
	# 认证权限密码，防止非法节点进入
authentication {
	auth_type PASS
	auth_pass 1111
} 
#	虚拟出来的ip，可以有多个（vip）
virtual_ipaddress {
	# 注意：主备两台的vip都是一样的，绑定到同一个vip
	192.168.51.101
	}
}

3.3 启动服务

[root@localhost ~]# cd /usr/local/keepalived/sbin/
[root@localhost sbin]# ./keepalived

3.4 查看运行

[root@localhost etc]#  ps -ef | grep keepalived
root       9964      1  0 16:14 ?        00:00:00 ./keepalived
root       9965   9964  0 16:14 ?        00:00:00 ./keepalived
root      10011   3463  0 16:31 pts/1    00:00:00 grep --color=auto keepalived
[root@localhost etc]# ip addr
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 00:50:56:26:f8:57 brd ff:ff:ff:ff:ff:ff
    inet 192.168.51.6/24 brd 192.168.51.255 scope global ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::250:56ff:fe26:f857/64 scope link 
       valid_lft forever preferred_lft forever
3: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN 
    link/ether 02:42:49:a9:d2:94 brd ff:ff:ff:ff:ff:ff
    inet 172.17.0.1/16 scope global docker0
       valid_lft forever preferred_lft forever

4 注册服务

4.1 拷贝文件

[root@localhost etc]# cd /opt/module/software/keepalived-2.0.18/keepalived/etc/
[root@localhost etc]# ll
总用量 44
drwxrwxr-x. 2 ts   rvm     86 2月   1 15:31 init
drwxrwxr-x. 2 ts   rvm    135 2月   1 15:31 init.d
drwxrwxr-x. 2 ts   rvm     29 8月  16 2018 keepalived
-rw-r--r--. 1 root root 19576 2月   1 15:31 Makefile
-rw-rw-r--. 1 ts   rvm    181 8月  16 2018 Makefile.am
-rw-rw-r--. 1 ts   rvm  18377 7月  26 2019 Makefile.in
drwxrwxr-x. 2 ts   rvm     24 8月  16 2018 openrc
drwxrwxr-x. 2 ts   rvm     24 8月  16 2018 sysconfig

[root@localhost etc]# cp init.d/keepalived  /etc/init.d/
[root@localhost etc]# cp sysconfig/keepalived /etc/sysconfig/
cp：是否覆盖"/etc/sysconfig/keepalived"？ y

4.2 载入配置

[root@localhost etc]# systemctl daemon-reload

4.2 常用命令

  • 启动

    [root@localhost ~]# systemctl start keepalived

  • 停止

    [root@localhost ~]# systemctl stop keepalived

  • 重启

    [root@localhost ~]# systemctl restart keepalived

5 功能测试

5.1 虚拟VIP访问

在这里插入图片描述

5.2 主机访问

在这里插入图片描述

5.3 备用机访问

在这里插入图片描述

5.4 主机宕机

1 主机停止 keepalived 服务

[root@localhost etc]# systemctl stop keepalived

在这里插入图片描述

2 备用机 查看 ip信息

[root@localhost etc]# ip addr
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 00:50:56:26:f8:57 brd ff:ff:ff:ff:ff:ff
    inet 192.168.51.6/24 brd 192.168.51.255 scope global ens33
       valid_lft forever preferred_lft forever
    inet 192.168.51.101/32 scope global ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::250:56ff:fe26:f857/64 scope link 
       valid_lft forever preferred_lft forever
3: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN 
    link/ether 02:42:49:a9:d2:94 brd ff:ff:ff:ff:ff:ff
    inet 172.17.0.1/16 scope global docker0
       valid_lft forever preferred_lft forever

inet 192.168.51.101/32 scope global ens33 切换成功

6 相关信息

  • 博文不易，辛苦各位猿友点个关注和赞，感谢

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