专辑：Linux专题_CentOS7中安装keepalived-Java充电社【公众号：Java充电社】

## 1、keepalived作用

> Keepalived是基于vrrp协议的一款高可用软件。它的作用是检测服务器的状态，如果有一台web服务器宕机，或工作出现故障，Keepalived将检测到，并将有故障的服务器从系统中剔除，同时使用其他服务器代替该服务器的工作，当服务器工作正常后Keepalived自动将服务器加入到服务器群中，这些工作全部自动完成，不需要人工干涉，需要人工做的只是修复故障的服务器。

## 2、keepalived安装

### 1)、下载

下载地址：<a href="https://www.keepalived.org/" target="_blank">https://www.keepalived.org/</a>，我们下载2.2.7

![](https://itsoku.oss-cn-hangzhou.aliyuncs.com/itsoku/blog/article/346/90097b86-b716-4b2b-8af2-a87d9e4058d6.png)

### 2)、上传到服务器

```shell
[root@test001 soft]# pwd
/opt/soft
[root@test001 soft]# ls
keepalived-2.2.7.tar.gz  nginx-1.20.2  nginx-1.20.2.tar.gz
```

### 3)、先安装下面的依赖包

```shell
yum -y install libnl libnl-devel
yum -y install openssl openssl-devel
```

### 4)、解压

```shell
[root@test001 soft]# cd /opt/soft/
[root@test001 soft]# ls
keepalived-2.2.7.tar.gz  nginx-1.20.2  nginx-1.20.2.tar.gz
[root@test001 soft]# tar -xzvf keepalived-2.2.7.tar.gz
```

### 5)、安装

```shell
[root@test001 keepalived-2.2.7]# pwd
/opt/soft/keepalived-2.2.7
[root@test001 keepalived-2.2.7]# ./configure --prefix=/usr/local/keepalived --sysconf=/etc
[root@test001 keepalived-2.2.7]# make && make install
```

### 6)、vi /etc/keepalived/keepalived.conf

内容如下

```shell
global_defs {
   # 路由id:当前安装keepalived节点主机的标识符，全局唯一
   router_id keep_128
}
vrrp_instance VI_1 {
    # 表示当前的128为ngxin的主节点，master
    state MASTER
    # 当前实例绑定的网卡名称:ifconfig可以查看
    interface ens33
    # 保证主备节点一致
    virtual_router_id 51
    # 优先级/权重，谁的优先级高，在master挂掉以后，就能成为master
    priority 100
    # 主备之间同步检查的时间间隔，默认1s
    advert_int 1
    # 认证授权的密码，防止非法的节点进入
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    # VIP
    virtual_ipaddress {
        192.168.216.130
    }
}
```

### 7)、启动之前看一下ip

![](https://itsoku.oss-cn-hangzhou.aliyuncs.com/itsoku/blog/article/346/2a540883-aa70-41dc-a37d-f05ad1898b25.png)

### 8)、启动keepalived

```shell
[root@test001 sbin]# pwd
/usr/local/keepalived/sbin
[root@test001 sbin]# ./keepalived
```

### 9)、再次查看网卡，发现多了一个虚拟的网卡

![](https://itsoku.oss-cn-hangzhou.aliyuncs.com/itsoku/blog/article/346/9266ba1e-a9d9-40f6-bb83-3eecd662b065.png)

## 3、把keepalived注册为系统服务

进入到keepalived的解压目录，拷贝相关的文件

```shell
[root@test001 keepalived-2.2.7]# cd /opt/soft/keepalived-2.2.7/keepalived/etc/
[root@test001 etc]# pwd
/opt/soft/keepalived-2.2.7/keepalived/etc
[root@test001 etc]# cp init.d/keepalived /etc/init.d/
[root@test001 etc]# cp sysconfig/keepalived /etc/sysconfig/
cp：是否覆盖"/etc/sysconfig/keepalived"？ y
[root@test001 etc]# systemctl daemon-reload
```

之后就可以使用systemctl进行启动、停止

```shell
[root@test001 etc]# systemctl stop keepalived.service
[root@test001 etc]# systemctl start keepalived.service
```

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