求适用于Android的轻量类Putty应用，及Amazon EC2实例安卓端访问方法

Hey there, let’s break down your two requests clearly and practically:

1. Lightweight, No-Redundancy PuTTY-Like Tools for AWS EC2 #

If you want a tool that sticks strictly to core SSH functionality (no bloat, no extra features you don’t need), these are your best bets:

• KiTTY: A stripped-down fork of PuTTY that retains all core SSH/Telnet capabilities while cutting unnecessary extras. It’s smaller in size, lets you save EC2 connection profiles (including private key paths, usernames, and instance IPs), and works exactly like PuTTY. Just remember to convert your AWS .pem key to .ppk format using puttygen first—same as you would with vanilla PuTTY.
• PuTTY Tray: This is vanilla PuTTY with one tiny, useful addition: tray minimization support. No other fluff, no extra features. Perfect if you love PuTTY’s workflow but want to keep it out of your taskbar when not in use. Connection steps match PuTTY exactly: input your EC2 public IP, port 22, import your .ppk key under SSH > Auth, and connect with the default username (e.g., ec2-user for Amazon Linux, ubuntu for Ubuntu instances).
• Termius (Minimal Mode): While Termius has advanced features like sync and SFTP, you can disable all those in settings to get a pure SSH client. It supports direct loading of .pem keys without conversion, which is a nice time-saver for AWS users. If you want a slightly modern look without the bloat, this works great.

Quick Connection Steps (for any of these tools): #

1. Enter your EC2 instance’s public IP/domain in the Host Name field.
2. Keep Port set to 22 and Connection Type as SSH.
3. Navigate to the SSH auth settings and select your converted .ppk (KiTTY/PuTTY Tray) or raw .pem (Termius) key.
4. Click "Open", enter the default username for your EC2 OS, and you’re connected.

2. Accessing Amazon EC2 from Android Devices #

Connecting to EC2 from Android is straightforward with these lightweight, no-frills apps:

Option 1: Termius (Android Version) #

This is my top pick because it’s intuitive and supports .pem keys natively:

• Open Termius, tap the "+" icon in the top-right to create a new connection.
• Fill in your EC2 public IP, port 22, and the default username for your instance’s OS.
• Switch to the "Keys" tab, tap "Add key", and select the .pem file stored on your Android device. Termius handles the rest—no key conversion needed.
• Save the connection, tap it, and you’ll be dropped into the EC2 command line. You can disable sync and other extra features in settings to keep it minimal.

Option 2: JuiceSSH #

Another solid, no-bloat SSH client for Android:

• Create a new connection, input your EC2 IP, port 22, and username.
• Go to the "Authentication" section, select "Private key", and import your .pem key. If you run into format issues, use a mobile PuTTYgen app to convert it to .ppk, but JuiceSSH usually handles .pem files without problems.
• Tap connect, and you’re ready to run commands on your EC2 instance.

Critical Notes for Android Access: #

• Ensure your EC2 instance’s security group allows inbound SSH (port 22) from your Android device’s public IP. For testing, you can temporarily allow 0.0.0.0/0, but remember to restrict it back to your IP later for security.
• Store your .pem key in a secure folder on your Android device—don’t leave it in a public directory.
• If you get connection timeouts, double-check your instance’s public IP, security group rules, and confirm your Android device has an active internet connection.

内容的提问来源于stack exchange，提问作者Mohammad Abdullah