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--- computers:server_basic_setup [2020/08/15 22:50] – [Network] chkuo
+++ computers:server_basic_setup [2023/10/27 16:54] (current) – hychang
@@ Line 3: / Line 3: @@
 ===== RAID =====
   * high-reliability servers (firewall, DHCP, web, etc)
-    * 4 drives: RAID 1 (* 2), hot spare * 1, cold spare *1
+    * 4 drives: RAID 1 (* 2), hot spare * 1, cold spare * 1
   * computational servers
     * RAID 10, hot spare * 1 or 2
@@ Line 20: / Line 20: @@
 # Zero Configuration Networking (Zeroconf)
 $ sudo apt install avahi-daemon
+# in case the avahi-daemon does not work after reboot, log-in using ip address and restart
+$ sudo service avahi-daemon restart
 # remove all unused packages
@@ Line 31: / Line 34: @@
 ===== Network =====
   * edit ''/etc/netplan/50-cloud-init.yaml'' to configure the network
-  * note: use space; NOT tab
+    * use space for indentation, NOT tab.
+    * or delete the original *.yaml file generated by the installer, then create a new xxx.yaml in ''/etc/netplan''
   * example: eno1 uses DHCP; eno2 uses a static IP
 <file>
 network:
-    ethernets:
+  version: 2
-        eno1:
+  renderer: networkd
-            addresses: []
+  ethernets:
-            dhcp4: true
+    eno1:
-        eno2:
+      addresses: []
-            addresses: [140.109.56.170/24]
+      dhcp4: true
-            gateway4: 140.109.56.254
+    eno2:
-            nameservers:
+      addresses: [140.109.56.170/24]
-                addresses: [140.109.1.10,8.8.8.8,8.8.4.4]
+      gateway4: 140.109.56.254
-            dhcp4: no
+      nameservers:
-    version: 2
+        addresses: [140.109.1.10,8.8.8.8,8.8.4.4]
+      dhcp4: no
 </file>
-  * after updating the config file, execute: ''sudo netplan apply''
+  * more examples: [[https://netplan.io/examples/]]
-  * use ''ip a'' to check network info:
+  * after updating the config file, execute ''sudo netplan try'' to validate, then ''sudo netplan apply'' to apply
+  * to check the network info: ''ip a''
+  * note: for Ubuntu 16.04 and earlier versions; edit ''/etc/network/interfaces''
@@ Line 111: / Line 120: @@
 <code bash>
 $ sudo deluser username groupname
+</code>
+==== Change username and home directory====
+<code bash>
+$ sudo usermod -l new_username old_username
+$ sudo usermod -d /home/new_username -m new_username
 </code>
@@ Line 128: / Line 143: @@
 $ sudo deluser username
 $ sudo delgroup groupname
+</code>
+==== Create scratch directory and storage====
+Run the shell script make_work_dir, which had written by Dr. Kuo.
+<code bash>
+$ sudo /home/chkuo/bin/make_work_dir username
 </code>