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  Mads Madsen 13:30 on February 16, 2019 Permalink | Reply
  Tags: Debian, Pi zero, Raspberry PI   

  Rename default pi user 

  After installing Raspbian Lite on a Raspberry PI, the default user pi is a liability. To fix this, a possibility is to create a new user and delete the old pi user, but I like recycling, so I’ll just rename the user.

  First we need to allow root login over ssh;

  1. Add PermitRootLogin yes to /etc/ssh/sshd_config
  2. Change the password of the root user $ sudo passwd root
  3. Restart ssh $ sudo service ssh restart

  Second login to the raspberry with root and execute the following;

  1. Kill all processes started by pi
     1. $ pkill -u pi
     2. $ pkill -9 -u pi
  2. $ usermod -l new_username pi
  3. $ groupmod -n new_username pi
  4. $ usermod -d /home/new_username new_username
  5. Remove PermitRootLogin yes from /etc/ssh/sshd_config
  6. Remove the root password $ passwd -d root
  7. Restart the raspberry pi $ reboot

   

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  Mads Madsen 01:44 on June 18, 2017 Permalink | Reply
  Tags: Debian, rsyslog   

  Make rsyslog log a specific program into its own log file and stop logging into syslog 

  /etc/rsyslog.d/kubelet.conf

  Shell

  if $programname == 'kubelet' then /var/log/kubelet.log if $programname == 'kubelet' then stop

  1 2	if $programname == 'kubelet' then /var/log/kubelet.log if $programname == 'kubelet' then stop

   
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  Mads Madsen 19:53 on February 13, 2014 Permalink | Reply
  Tags: CentOS ( 2 ), Debian, Linux ( 3 ), uid, usermod   

  Change a user’s UID 

  First login as root – Clean login – sudo will not work if you’re changing a UID on an already logged in user.

  Find the user’s old UID:

  Shell

  id user1

  1

  id user1

  uid=1000(user1) ….

  Change the UID:

  Shell

  usermod -u 1001 user1

  1	usermod -u 1001 user1

  Update files and directories owned by the user to the new UID:

  Shell

  find / -uid 1000 -exec chown -h 1001 '{}' \+

  1	find / -uid 1000 -exec chown -h 1001 '{}' \+

  Reboot and the UID has been changed.

   
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  Mads Madsen 22:51 on April 17, 2013 Permalink | Reply
  Tags: CentOS ( 2 ), Debian, Linux ( 3 ), networking ( 2 ), udev   

  Fixing eth numbering 

  While moving virtual machines around, it will usually mean a change on MAC addresses on the networking interfaces, which will create new eth nodes on the machine.
  Reasons for the renaming of eth nodes on the machine, is due to the persistent mapping on Linux systems using udev.
  Fixing this is done by removing the entities in the /etc/udev/rules.d/70-persistent-net.rules and reboot the machine.