<p>Baru-baru ini saya ada setup sistem email menggunakan Ubuntu 18.04 LTS. Saat itu sistem berjalan aman, namun tiba-tiba muncul kendala ketika server direboot, sehingga membuat sistem tidak bisa melakukan resolver nama domain external. Setelah ditelusuri, kendalanya ada pada isian file /etc/resolv.conf, dimana sebelum di reboot, saya ada melakukan perubahan isian nameserver pada file tersebut agar bisa melakukan resolv nama domain, namun ternyata setelah di reboot, isian file tersebut kembali ke semula, dengan nameserver mengarah ke 127.0.0.53. Jika dicek lebih detail, file /etc/resolv.conf merupakan symlink dari file <span class="s1">/run/resolvconf/resolv.conf, sehingga meskipun kita mengubah isian di /etc/resolv.conf, setelah di reboot, isian akan kembali ke semua.</span></p>
<p>Berikut langkah-langkah untuk mengatasi hal tersebut dan membuat permanent isian file /etc/resolv.conf</p>
<p>1. Pastikan nameservers sudah di set pada saat konfigurasi IP Address, lokasi file nya ada di <span class="s1">/etc/netplan/50-cloud-init.yaml</span></p>
<pre>network: 
 ethernets: 
 ens18: 
 addresses: 
 - 192.169.169.202/24 
 gateway4: 192.169.169.1 
 <span style="color: #ff0000;">nameservers: 
 addresses: 
 - 192.169.169.201 
 - 8.8.8.8</span> 
 version: 2 
</pre>
<p>2. Jalankan netplan apply untuk mengapply konfigurasi diatas</p>
<p>3. Setelah itu, maka konfigurasi nameservers yang tadi di set, akan masuk ke file <span class="s1">/run/systemd/resolve/resolv.conf seperti berikut</span></p>
<p><img data-attachment-id="1582" data-permalink="https://rizkypratama.id/blog/2019/10/10/membuat-permanent-etc-resolv-conf-pada-ubuntu-18-04/screen-shot-2019-10-10-at-16-18-24/" data-orig-file="https://i0.wp.com/rizkypratama.id/wp-content/uploads/2019/10/Screen-Shot-2019-10-10-at-16.18.24.png?fit=723%2C288&;ssl=1" data-orig-size="723,288" data-comments-opened="1" data-image-meta="{";aperture";:";0";,";credit";:";";,";camera";:";";,";caption";:";";,";created_timestamp";:";0";,";copyright";:";";,";focal_length";:";0";,";iso";:";0";,";shutter_speed";:";0";,";title";:";";,";orientation";:";0";}" data-image-title="Screen Shot 2019-10-10 at 16.18.24" data-image-description="" data-image-caption="" data-large-file="https://i0.wp.com/rizkypratama.id/wp-content/uploads/2019/10/Screen-Shot-2019-10-10-at-16.18.24.png?fit=723%2C288&;ssl=1" class="aligncenter wp-image-1582 " src="https://rizkypratama.id/wp-content/uploads/2019/10/Screen-Shot-2019-10-10-at-16.18.24.png" alt="" width="603" height="240" /></p>
<p><span class="s1">Selanjutnya kita harus ubah symlink dari /etc/resolv.conf nya</span></p>
<p>4. Jalankan peritah berikut untuk mengubah symlink nya</p>
<pre>unlink /etc/resolv.conf 
ln -sf /run/systemd/resolve/resolv.conf /etc/resolv.conf 
</pre>
<p>5. Maka isian /etc/resolv.conf akan selalu mengacu pada isian file <span class="s1">/run/systemd/resolve/resolv.conf dimana file tersebut bergantung pada konfigurasi nameservers di file /etc/netplan/50-cloud-init.yaml</span></p>
<p>6. Silakan reboot server untuk memastikan isian tersebut tidak akan berubah ke semula kembali</p>
<p>Mungkin cukup sekian, semoga bermanfaat</p>
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