1. Login without using keypairs#

Copy your ssh public key on your computer into the ~/.ssh/authorized_keys file on you EC2 instance.

On you local machine:

$ cat ~/.ssh/id_rsa.pub 
...

Copy the content into your EC2 instance:

$ sudo vi .ssh/authorized_keys

Then you can login directly.

2. oh-my-zsh shell# 

sudo apt install zsh -y
chsh -s /bin/zsh
sh -c "$(wget https://raw.github.com/ohmyzsh/ohmyzsh/master/tools/install.sh -O -)"
# wget 有时候会出现 timeout, 可以用 curl 代替:
# sh -c "$(curl -fsSL https://raw.githubusercontent.com/ohmyzsh/ohmyzsh/master/tools/install.sh)"

3. Set up ufw# 

➜  ~ ufw status
Status: active

To                         Action      From
--                         ------      ----
22/tcp                     ALLOW       Anywhere
22/tcp (v6)                ALLOW       Anywhere (v6)

# if you need 443, do this:
➜  ~ ufw allow 443
Rule added
Rule added (v6)

# or just disable
➜  ~ ufw disable

Learn more: ufw vs AWS Security Group - David’s Blog

4. Other info#

After basic settings, on Alpine Linux: 1 vCPUs, 512 MB RAM, 10G SSD, Vultr VPS:

➜  ~ df -h
Filesystem      Size  Used Avail Use% Mounted on
devtmpfs         10M     0   10M   0% /dev
shm             231M     0  231M   0% /dev/shm
/dev/vda2       9.2G  579M  8.2G   7% /
tmpfs            93M  336K   92M   1% /run
/dev/vda1       256M  266K  256M   1% /boot/efi
tmpfs           231M     0  231M   0% /tmp

➜  ~ speedtest-cli
Testing download speed................................................................................
Download: 1648.48 Mbit/s
Testing upload speed......................................................................................................
Upload: 1013.83 Mbit/s

❯ iperf -c 149.22.12.30 -R
[ ID] Interval       Transfer     Bandwidth
[ *1] 0.00-3.00 sec  77.2 MBytes   216 Mbits/sec
[ *1] 3.00-6.00 sec   105 MBytes   295 Mbits/sec
[ *1] 6.00-9.00 sec   101 MBytes   282 Mbits/sec

❯ iperf -c 149.22.12.30
[ ID] Interval       Transfer     Bandwidth
[  1] 0.00-3.00 sec   102 MBytes   286 Mbits/sec
[  1] 3.00-6.00 sec   104 MBytes   290 Mbits/sec
[  1] 6.00-9.00 sec   100 MBytes   281 Mbits/sec


# vpn x-ui
bash <(curl -Ls https://raw.githubusercontent.com/FranzKafkaYu/x-ui/956bf85bbac978d56c0e319c5fac2d6db7df9564/install.sh) 0.3.4.4