“This is the 16th day of my participation in the Gwen Challenge in November. Check out the details: The Last Gwen Challenge in 2021.”

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Java with Notes: Java with Notes

1. Add user root

  • Because the default user of Tencent cloud service is Ubuntu user every time I log in, but I need to use SCP command to upload some files to the server, many operations do not have permissions, it is very troublesome, so I change it to allow root user to log in.

  • 1. Log in to Ubuntu using the following command:

ssh ubuntu@118.89193.239.
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  • The following information is displayed:

  • 2. Run the following command to change the root password:

sudo passwd root
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  • Password input is not visible and needs to be entered again!

  • The following information is displayed:

  • 3. Run the following command to modify the SSH configuration:

sudo vi /etc/ssh/sshd_config
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4. Restart the SSH service

sudo service ssh restart
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2. Enable SSH remote login

  • All the following operations are performed by the root user: If you are not in the root user login state, add sudo before all commands
  • 1. Install the SSH
apt-get install openssh-server
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  • 2. Check whether SSH is successfully installed
 ps -e |grep ssh
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  • If the following information is displayed: If SSHD exists, the SSH service is started
  • 3. If the SSH service is not enabled, run the following command: The SSH service is enabled
service ssh start 
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  • 4. At this time, all our services have been started, but the remote connection may report the following error:
Permission denied, please try again(publickey,password)
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  • This is because we did not enable the remote connection service:
  • First open the /etc/ssh/sshd_config file
vim /etc/ssh/sshd_config
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  • The following information is displayed:
  • Find the PermitRootLogin Prohibit-Password location, comment it out, and add the following to the original location:
PermitRootLogin yes
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  • Try connecting again:
ssh root@118.89193.239.
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  • The connection is successful:
  • 5. Restart the SSH service
sudo service ssh restart
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The road ahead is long, I see no end, I will search high and low

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