keepalive的安装

你可以选泽Linux发行版的存储库安装或源代码编译安装keepalive,但从存储库通常是安装最快的办法

## 1 从存储库安装

### 1.1 在Red Hat（CentOS）安装

```bash
# 常规安装
yum install keepalived
# 安装到指定目录下，有可能不会复用已有依赖
# yum install --installroot=/usr/local -–releasever=/ keepalived
```

### 1.2 在Debian中安装

```bash
apt-get install keepalived
```

## 2. 源代码编译安装

### 2.1 依赖安装
编译keepalive需要 compiler, OpenSSL 和 Netlink Library。如果需要SNMP支持，请安装Net-SNMP。

#### RHEL/CentOS/Fedora依赖安装

在 RHEL, Centos, Fedora 安装依赖指令(旧版本使用yum替代 dnf )::
```bash
dnf install curl gcc autoconf automake openssl-devel libnl3-devel \
    iptables-devel ipset-devel net-snmp-devel libnfnetlink-devel file-devel

# DBUS 支持::
dnf install glib2-devel

# JSON 支持::
dnf install json-c-devel
```

#### Debian/Ubuntu依赖安装

在 Debian/Ubuntu中, 安装依赖指令::
```
apt-get install pkg-config curl gcc autoconf automake libssl-dev libnl-3-dev \
    libnl-genl-3-dev libsnmp-dev libnl-route-3-dev libnfnetlink-dev libipset-dev \
    iptables-dev libsnmp-dev

# DBUS 支持::
dnf install libglib2.0-dev
```

#### Alpine Linux依赖安装
```
autoconf automake iptables-dev ipset-dev libnfnetlink-dev libnl3-dev musl-dev and
    openssl-dev or libressl-dev
 
# SNMP 支持::
net-snmp-dev (requires libressl-dev and not openssl-dev)
```

#### Archlinux 依赖安装
```
pacman -S ipset libnfnetlink libnl1
#  SNMP 支持::
pacman -S net-snmp
```

### 2.2 依赖安装完后，进行keepalived的编译安装

最新版本查看 http://www.keepalived.org/download.html 或 https://github.com/acassen/keepalived. 
使用*curl* 或 *wget* 下载tar包后编译安装

```
curl --progress http://keepalived.org/software/keepalived-1.2.15.tar.gz | tar xz
cd keepalived-1.2.15
./build_setup
./configure
make && make install
```

也可以指定安装目录::
```
./configure --prefix=/usr/local/keepalived-1.2.15
```

这使它容易卸载keepalive,只有删除父目录即可。此外,这种安装方法 允许多个版本的keepalive安装而不需要覆盖。使用软连接指向所需的版本。例如,您的目录布局可能看起来像这样:
```bash
[root@lvs1 ~]# cd /usr/local
[root@lvs1 local]# ls -l
total 12
lrwxrwxrwx. 1 root root   17 Feb 24 20:23 keepalived -> keepalived-1.2.15
drwxr-xr-x. 2 root root 4096 Feb 24 20:22 keepalived-1.2.13
drwxr-xr-x. 2 root root 4096 Feb 24 20:22 keepalived-1.2.14
drwxr-xr-x. 2 root root 4096 Feb 24 20:22 keepalived-1.2.15
```

## 3. 设置自启脚本

编译后,创建一个init脚本为了管理keepalive守护进程

### 3.1 在 RHEL中
```
# 存储库安装
ln -s /etc/rc.d/init.d/keepalived.init /etc/rc.d/rc3.d/S99keepalived
# 编译安装
mkdir /etc/keepalived
cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
ln -s /usr/local/keepalived/sbin/keepalived /usr/sbin/
ln -s /usr/local/keepalived/sbin/keepalived /sbin/

# 开启自启
systemctl enable keepalived
```

### 3.3 在 Debian中
```
# 存储库安装
ln -s /etc/init.d/keepalived.init /etc/rc2.d/S99keepalived
```

注意:该链接应添加到您的默认运行级别目录中。

## 防火墙放行多播协议
```
firewall-cmd --direct --permanent --add-rule ipv4 filter INPUT 0 --in-interface eth0 --destination 224.0.0.18 --protocol vrrp -j ACCEPT
firewall-cmd --reload
```

> 参考 https://github.com/acassen/keepalived