Ubuntu 19.10 enables ssh service (detailed process)

It took me more than an hour to open ssh in Ubuntu. The main reason was that the tutorial steps I read at the beginning were not detailed. Then I turned on a host worth more than 10,000 yuan, and the startup and shutdown were quite slow. I recorded the detailed steps here for your convenience in future reference.

The first step is to check whether ssh is enabled.

sudo ps -e | grep ssh

If the final return is sshd, it proves that ssh has been enabled and jump to step 4

Step 2, if there is no display, try to enable the ssh service

sudo /etc/init.d/ssh start

If the command is not found, it means that the ssh service is not installed.

The third step is to install the openssh service and check whether the service is enabled.

sudo apt-get install openssh-server
sudo ps -e | grep ssh

If not, run the enable command

sudo /etc/init.d/ssh start

Step 4: Check if the firewall has port 20 open (SSH opens port 22 by default, if you need to modify it, see step 5)

netstat -an | grep 22
# or ufw status

If not, open port 22

ufw allow 22

Step 5: Change the ssh port (optional)

sudo vi /etc/ssh/sshd_config

ssh restart

service sshd restart

Step 6: Firewall takes effect and starts up

ufw enable

Step 7: Check the IP address, remember the IP address, and set a static IP

ifconfig 

Set static ip:
Open vim /etc/netplan/ and check. I have seen other people's articles use vim /etc/netplan/01-netcfg.yaml, but I use 50-cloud-init.yaml, so they may not be the same.

cd /etc/netplan/
ls
vim 50-cloud-init.yaml

Set to

network:
  ethernets:
    enp3s0:
      dhcp4: false
      addresses: [192.168.101.135/24]
      gateway4: 192.168.101.1
      nameservers:
          addresses: [192.168.101.1, 8.8.8.8]
    enp4s0:
      dhcp4: true
  version: 2

Next, ping the computer to see if it works. If not, check whether it is in the same subnet and gateway. Then download xshell or putty. Remember to enter the port correctly.

Optional: Set up root login to ssh

sudo vim /etc/ssh/sshd_config

Change PermitRootLogin prohibit-password to PermitRootLogin yes
Remember to restart ssh

sudo systemctl restart sshd

Then the next step is to connect to the computer using xshell or putty, remember to select port 22, if you have not changed it

This is the end of this article about how to enable ssh service in Ubuntu 19.10 (detailed process). For more information about how to enable ssh in Ubuntu 19.10, please search for previous articles on 123WORDPRESS.COM or continue to browse the following related articles. I hope you will support 123WORDPRESS.COM in the future!