document how to bring kernel commandline arguments to the installer

admin-guide/deployment/sample.md

@@ -39,17 +39,17 @@ We setup its MAC address:
 
 Next decide how the IP address is configured (`dhcp` or `static`):
 
-    bob node set-attr syslog-ra.psi.ch network=static
+    bob node set-attr logging-ra.psi.ch network=static
 
 And which installer is used:
 
-    bob node set-attr syslog-ra.psi.ch ipxe_installer=rhel8install
+    bob node set-attr logging-ra.psi.ch ipxe_installer=rhel8install
 
 And we finally setup the puppet role and puppet environment:
 
-    bob node set-attr syslog-ra.psi.ch puppet_role=role::log_server
-    bob node set-attr syslog-ra.psi.ch puppet_env=prod
-    bob node set-attr syslog-ra.psi.ch puppet_group=logging
+    bob node set-attr logging-ra.psi.ch puppet_role=role::log_server
+    bob node set-attr logging-ra.psi.ch puppet_env=prod
+    bob node set-attr logging-ra.psi.ch puppet_group=logging
 
 
 ## Example
@@ -63,3 +63,18 @@ Full example:
     bob node list -v lx-test-02
 
 Ensure that a potential previous puppet certificate for this server is deleted on the puppet server: https://puppet.psi.ch
+
+## Special Settings
+
+### Custom Kernel Commandline Arguments
+For custom kernel commandline arguments for the installer (e.g. to provide drivers) the sysdb attribute
+`kernel_cmdline` can be used:
+
+```
+bob node set-attr lx-test-02.psi.ch kernel_cmdline=inst.dd=https://linuxsoft.cern.ch/elrepo/dud/el8/x86_64/dd-megaraid_sas-07.725.01.00-1.el8_9.elrepo.iso
+```
+
+### Custom System Disk and Partitioning
+
+Please check out the [Partitioning page](partitioning).
+