High Availability Web Server

Konfigurasi IP Address & Hostname

DNS Server

Set Hostname

hostnamectl set-hostname ns1

Konfigurasi Network

nano /etc/network/interfaces

# Interface Internet
auto enp0s3
iface enp0s3 inet dhcp

# Interface Lokal
auto enp0s8
iface enp0s8 inet static
    address 192.168.10.1
    netmask 255.255.255.0  

systemctl restart networking  

Web-01

Set Hostname

hostnamectl set-hostname web01  

Konfigurasi Network

nano /etc/network/interfaces  

auto enp0s3
iface enp0s3 inet dhcp

auto enp0s8
iface enp0s8 inet static
    address 192.168.10.2
    netmask 255.255.255.0  

systemctl restart networking  

Web-02

set hostname

hostnamectl set-hostname web02  

konfigurasi network

nano /etc/network/interfaces  

auto enp0s3
iface enp0s3 inet dhcp

auto enp0s8
iface enp0s8 inet static
    address 192.168.10.3
    netmask 255.255.255.0  

systemctl restart networking  

Installasi dan Konfigurasi DNS (ns1)

Install Bind9

apt update && apt install bind9 -y  

Membuat Zone

nano /etc/bind/named.conf.local  

zone "web.lan" {
    type master;
    file "/etc/bind/db.web";
};  

Konfigurasi File DB

nano /etc/bind/db.web  

$TTL    604800
@       IN      SOA     ns1.web.lan. root.web.lan. (
                      1         ; Serial
                 604800         ; Refresh
                  86400         ; Update
                2419200         ; Expire
                 604800 )       ; Negative Cache
;
@       IN      NS      ns1.web.lan.
ns1     IN      A       192.168.10.1
www     IN      A       192.168.10.100  

systemctl restart bind9  

Installasi Web Server (Web01 & Web02)

Jalankan perintah ini di kedua server web:

apt update && apt install nginx -y  

Membuat halaman web

pada web 1

echo "<h1>WEB 01 - MASTER</h1>" > /var/www/html/index.html  

pada web2

echo "<h1>WEB 02 - SLAVE</h1>" > /var/www/html/index.html  

Konfigurasi KeepAlived( High Availability)

install di Web01 dan Web02

apt install keepalived -y  

Konfigurasi KeepAlived Master (web01)

nano /etc/keepalived/keepalived.conf  

vrrp_instance VI_1 {
    state MASTER
    interface enp0s8
    virtual_router_id 51
    priority 101
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 123
    }
    virtual_ipaddress {
        192.168.10.100
    }
}  

KOnfigurasi KeepAlived Master (Web02)

vrrp_instance VI_1 {
    state BACKUP
    interface enp0s8
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 123
    }
    virtual_ipaddress {
        192.168.10.100
    }
}  

systemctl restart keepalived  

Pengujian

1. Akses www.web.lan dari client (pastikan DNS client diarahkan ke 192.168.10.1).
2. Harusnya muncul konten dari Web01.
3. Matikan Web01 (systemctl stop nginx atau matikan VM).
4. Refresh browser, konten harusnya berubah menjadi Web02 secara otomatis tanpa mengganti IP/Domain.