Differences

This shows you the differences between two versions of the page.

--- helpful_ubuntu_commands [2026/08/08 20:15] – mike
+++ helpful_ubuntu_commands [2026/09/02 19:57] (current) – mike
@@ Line 45: / Line 45: @@
 === Copy an existing partition to a new partition ===
   sudo rsync -aAXv --info=progress2 --exclude='/lost+found' /disk2/ /newdisk/
+=== Copy a directory and all its subdirs to another directory ===
+  rsync -av /path/to/source/ /path/to/destination/
 === Finding largest files/directories ===
@@ Line 79: / Line 82: @@
 ==== Ansible/Automation Related Info ====
-=== Generate password hashes (useful for Ansible playbooks amongst other things) ===
+=== Generate password hashes (useful for Ansible playbooks, Ansible Vault, amongst other things) ===
   mkpasswd --method=sha-512
@@ Line 131: / Line 134: @@
   sudo netplan apply
+  Update the /etc/hosts file accordingly
+=== Changing the server's IP address from DHCP to static ===
+. Disable cloud-init networking to avoid overwriting the new configuration:
+  echo "network: {config: disabled}" | sudo tee /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg
+. cd into /etc/netplan and edit the file that is there.  Replace the contents with the following (supplying the specific IP address/etc where required):
+  network:
+    version: 2
+    renderer: networkd
+    ethernets:
+        ens18:
+            dhcp4: false
+            addresses:
+              - 192.168.1.xx/24
+            nameservers:
+              addresses:
+                - 192.168.1.1
+            routes:
+              - to: default
+                via: 192.168.1.1
+. Execute ''netplan apply'' to apply immediately or reboot to verify reboot survivability.
 === Changing the server's host name ===
   hostnamectl set-hostname [new host name]