more serial console config

howto/new-machine-cymru.md

@@ -122,6 +122,39 @@ with:
 See [howto/new-machine](howto/new-machine) for post-install configuration steps, then follow
 [howto/new-machine-mandos](howto/new-machine-mandos) for setting up the mandos client on this host.
 
+IMPORTANT: Do not forget the extra configuration steps, below.
+
+### serial console
+
+Add this to the grub config to get the serial console working, in
+(say) `/etc/default/grub.d/serial.cfg`:
+
+    # enable kernel's serial console on port 1 (or 0, if you count from there)
+    GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX console=tty0 console=ttyS0,115200n8"
+    # same with grub itself
+    GRUB_TERMINAL="serial console"
+    GRUB_SERIAL_COMMAND="serial --speed=115200 --unit=0 --word=8 --parity=no --stop=1"
+
+Then enable the serial console login as well, for good measure:
+
+    systemctl enable serial-getty@ttyS0.service
+    systemctl start serial-getty@ttyS0.service
+
+### initramfs boot config
+
+TODO: figure out the best way to setup the initramfs. So far we've
+dumped the IP address in `/etc/default/grub.d/local-ipaddress.cfg`
+like so:
+
+    # for dropbear-initramfs because we don't have dhcp
+    GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX ip=38.229.82.104::38.229.82.1:255.255.255.0::eth0:off"
+
+... but it seems it's also possible to specify the IP by configuring
+the initramfs itself, in `/etc/initramfs-tools/conf.d/ip`, for example
+with:
+
+    echo 'IP="${ip_address}::${gateway_ip}:${netmask}:${optional_fqdn}:${interface_name}:none"'
+
 ## idrac consoles
 
 "Consoles", in this context, are interfaces that allows you to connect