System Administration tips for Ubuntu
Use dropbear to remotely unlock a fully encrypted disk via ssh
If you've enabled full disk encryption, you will need to enter a password to unlock the disk at reboot time. If you want to be able to unlock the disk remotely via ssh, here are the steps
- http://blog.netpacket.co.uk/2016/12/05/unlocking-ubuntu-server-16-encrypted-luks-using-dropbear-ssh/
- After following the above steps, I create an entry called "unlock" in my ~/.ssh/config file on my Mac laptop. So after I boot my Ubuntu 16.04 LTS Desktop VM (using the VirtualBox CLI), then I type 'ssh unlock', and type 'unlock' when presented with the busybox prompt. I am prompted to enter a password to unlock the encrypted disk. After that, the system will boot up, then I can ssh in remotely.
Host unlock
Hostname 192.168.56.101
User root
IdentityFile /Users/ksa/.ssh/id_rsa_ubuntu_unlock
StrictHostKeyChecking no
List all software repositories
You can look at the /etc/apt/sources.list file, and in the /etc/apt/sources.list.d/ directory, but here is a single command line which can list all the sources
- apt-cache policy
Use Landscape or Cockpit to centrally manage and monitor Ubuntu machines
If you have a group of 10 or fewer Ubuntu hosts you administer, you can install Landscape (on premises version) in a VM to manage those hosts for free.
- https://landscape.canonical.com/set-up-on-prem
In addition to Landscape (or an alternative) is Cockpit which you can use to centrally manage CentOS, RedHat, Fedora, and Ubuntu hosts:
- http://www.configserverfirewall.com/ubuntu-linux/install-cockpit-ubuntu-16-04/
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