The original concept of this blog was to provide a reference for myself as a go forward in technology:
Here are some interesting "Tasks" that I learned and have been using. This is the living blog post that I plan to keep updating as I go.
Ubuntu distro upgrade:
- Upon the deployment of an Ubuntu server (22.10 --> 22.04 LTS) run the command:
- sudo do-release-upgrade
Setup SSH authentication using PKI on a new server deploy:
- I started with setting the hosts file on my Mac to know the IP of the name I wanted to use. This is optional because there may be a DNS A record for the computer you want to connect to already
- Connect to the local console of the computer and log in. ( I have a VM that is running this so I just connect to the console and login with the user account ubuntu)
- Type sudo su - command to elevate to root privileges
- Type nano /etc/ssh/sshd_config to edit and allow ssh access to the VM
- Find and change the PasswordAuthentication no --> yes or uncomment it.
- Find and change the PubkeyAuthentication yes
- We need to verify the permissions on the files and directories
- the .ssh directory is hidden but should be rwx for the user ubuntu
- the file authorized_keys should be rw-
- Restart the sshd service systemctl restart sshd
- Test ssh to the computer ssh ubuntu@192.168.2.3 and login with the password
- Exit the connection
- On the client that will be connecting to the computer generate the ssh key pair
- ssh-keygen -t rsa -b 4096
- Enter the file for the keys (I usually leave them default)
- Enter a passphrase for additional security
- Verify the files are there ls ~/.ssh/id*
- Copy the keys using ssh-copy-id ubuntu@192.168.2.3
- Enter the Password and the keys are copied
- Try logging in with ssh
- ssh ubuntu@192.168.2.3
Setting up a static address using Ubuntu's Netplan configuration
https://linuxize.com/post/how-to-configure-static-ip-address-on-ubuntu-20-04/
- Get the naming of your interfaces with ip link | grep 2
- This displays the name of the interface in which mine is ens192
- On older Ubuntu OS's that have been upgraded start with clearing your interface settings
- ip addr ens192 flush
- Next will be to disable the cloud init configuration.
- If you look in the file /etc/netplan/50-cloud-init.yaml you will see the method to disable the cloud-init's network configuration.
- Create a file 99-disable-network-config.cfg with touch, or using nano within the /etc/cloud/cloud.cfg.d/ directory
- In the file type, network: {config: disabled} using spaces and not using tabs
- Save the file Ctrl-x -- Y in nano
Configuring the yaml for Netplan
- Go to /etc/netplan and create a file named 01-netcfg.yaml
- Within the file use the syntax from man netplan as there is a LOT of options
- Generally I use:
- Once the yaml is created save it and make sure to either remove the original 50-cloud-init.yaml by renaming it mv 50-cloud-init.yaml 50-cloud-init.yml or comment the configuration items in the file (even though in the file it says that configurations will not retain through a reboot)
- Type apply netplan to have the yaml file implemented
- Then type ip addr to verify the IP change
More to come...
Comments