Konfigurasi SSH dan Cara Akses Remote Ubuntu Server Menggunakan SSH

🐧 AlmaLinux SSH Server Setup

1. Install SSH

$ sudo dnf install -y openssh-server openssh-clients
$ sudo systemctl enable sshd --now

2. Edit Config SSH (VIM only)

$ sudo vim /etc/ssh/sshd_config

🔽 Ubah:

#Port 22

jadi:

Port 2802

Simpan dengan :wq

Restart service:

$ sudo systemctl restart sshd

3. Tes Akses

Default user:

$ ssh -p 2802 user@ip-alma

User baru:

$ sudo adduser genz

$ ssh -p 2802 genz@ip-alma

Root (sebelum di-disable):

$ ssh -p 2802 root@ip-alma

4. Disable Root Login

$ sudo vim /etc/ssh/sshd_config

Set:

PermitRootLogin no

Restart service:

$ sudo systemctl restart sshd

5. SSH Key Auth 🔑

Generate key di laptop:

$ ssh-keygen -t rsa -b 4096

Copy key ke AlmaLinux:

$ ssh-copy-id -p 2802 genz@ip-alma

Edit config:

PasswordAuthentication no
PubkeyAuthentication yes

Restart:

$ sudo systemctl restart sshd

✅ Tes:

@ ssh -p 2802 genz@ip-alma