Remove read-only option and rename scripts

README.md

@@ -8,7 +8,7 @@ $ ./install_raspap_ro_wlan.sh
 Follow the instructions.
 
 ## Configure Raspian, install drivers and start the RaspAP installer
-The script `install_raspap_ro_wlan.sh` configures Raspian for a (nearly) read-only operation (see below), allows to install additional Wifi driver modules and starts the RaspAP installer ( https://install.raspap.com ). See details about the Raspian configuration and driver installation below.
+The script `install_raspap_ram_wlan.sh` configures Raspian for a (nearly) read-only operation, allows to install additional Wifi driver modules and starts the RaspAP installer ( https://install.raspap.com ). See details about the Raspian configuration and driver installation below.
 
 ## Install missing WLAN driver modules
 A standard nuisance of Raspian is, that drivers for a lot of WLAN devices are missing. This is especially true for Realtek based devices.
@@ -20,15 +20,10 @@ The webpage http://downloads.fars-robotics.net by MrEngman provides a lot of pre
 If you prefer to compile drivers from scratch, the script `install_wlan_drivers_8812au_88x2bu.sh` extracts the source for two very common drivers (Realtek 8812au and 88x2bu) from Github. The source is compiled and the installation done via DKMS. This ensures, that the driver is automatically recompiled, when the kernel version is changing.
 Depending on the raspberry pi version, this can take a long time.
 
-## Raspian with substantially reduced SD-Card access
+## Raspian with substantially reduced SD-Card write access
 Utilizing a Raspberry PI as an access point, requires a reliable operation over a long period of time. Switching the Raspberry PI off without a regular shutdown procedure might lead to a damaged system. Writing lots of logging and temporary data to the SD-card will shorten the lifetime of the system. 
 
 Moving logging and temporary data to a RAM based files system can minimize the risk and extend the lifetime of the SD-card substantially.
 
-The script `raspian_readonly.sh` will replaces the default logging service, moves temporary file locations to RAM and switches off the file system check and swap in `/boot/config.txt`. By default the file system is still in read/write mode, so RaspAP settings can be saved. 
+The script `raspian_min_write.sh` replaces the default logging service, moves temporary file locations to RAM and switches off the file system check and swap in `/boot/config.txt`. By default the file system is still in read/write mode, so RaspAP settings can be saved. 
 The remaing access to the SD-card can be checked with the tool `iotop -aoP`. 
-
-## Read-only Raspian
-For a fully read-only system, start the script with the read-only option: `raspian_readonly.sh -ro`
-Be aware, that this might render your system unusable. Check the log files (`journalctl`) for error messages. 
-In order to write changes to the system, you can remount the file system with the command `rw`, which is placed into `.bashrc`. Remounting to read-only is achieved by the command `ro`.  

install_raspap_ro_wlan.sh → install_raspap_ram_wlan.sh

@@ -5,9 +5,9 @@
 # - Write Raspian lite to a SD-card
 # - Create a file with name "ssh" (no extension) on the partition called "boot", to allow for SSH access
 # - start the Raspberry PI with the SD-Card and login via ssh (default user: pi, password: raspberry)
-# - download this script: "wget https://raw.githubusercontent.com/zbchristian/raspap-tools/main/install_raspap_ro_wlan.sh"
-# - chmod +x install_raspap_ro_wlan.sh
-# - ./install_raspap_ro_wlan.sh
+# - download this script: "wget https://raw.githubusercontent.com/zbchristian/raspap-tools/main/install_raspap_ram_wlan.sh"
+# - chmod +x install_raspap_ram_wlan.sh
+# - ./install_raspap_ram_wlan.sh
 #
 
 RED="\e[31m\e[1m"
@@ -21,8 +21,8 @@ function _echo() {
 }
 
 function _RAMVersion() {
-  wget -q https://raw.githubusercontent.com/zbchristian/raspap-tools/main/raspian_readonly.sh -O /tmp/raspian_readonly.sh
-  source /tmp/raspian_readonly.sh
+  wget -q https://raw.githubusercontent.com/zbchristian/raspap-tools/main/raspian_min_write.sh -O /tmp/raspian_min_write.sh
+  source /tmp/raspian_min_write.sh
 }
 
 function _installWifiDrivers() {

raspian_min_write.sh

@@ -0,0 +1,54 @@
+#!/bin/bash
+# RASPBERRY PI: limit the sd-card write operation to a minimum by moving temporary and log files to RAM
+# - Write access can be checked with "iotop -aoP"
+# - Remaining access originates mainly from the ext4 journal update (process jbd2)  
+#
+# tested with Raspian lite Buster 
+# zbchristian 2020
+
+function _dirs2tmpfs() {
+  for dir in "${dirs[@]}"; do
+    echo "Move $dir to RAM"
+    if ! grep -q " $dir " /etc/fstab; then
+      echo "tmpfs $dir tmpfs  nosuid,nodev 0 0" | sudo tee -a /etc/fstab
+    fi
+  done 
+}
+
+RED="\e[31m\e[1m"
+GREEN="\e[32m\e[1m"
+DEF="\e[0m"
+
+echo -e "${GREEN}\n\nModify System to minimize the Write Access to the SD-Card${DEF}\n"
+
+echo -e "${GREEN}Remove some packages ...${DEF}"
+
+sudo apt -y remove --purge triggerhappy dphys-swapfile logrotate 
+sudo apt -y autoremove --purge
+
+echo -e "${GREEN}Disable services ...${DEF}"
+
+sudo systemctl unmask bootlogd.service
+sudo systemctl disable bootlogs
+sudo systemctl disable console-setup
+sudo systemctl disable apt-daily.service apt-daily.timer apt-daily-upgrade.timer apt-daily-upgrade.service
+
+echo -e "${GREEN}Install new logger ...${DEF}"
+sudo apt-get -y install busybox-syslogd
+sudo dpkg --purge rsyslog
+
+echo -e "${GREEN}Modify boot options to switch off swap and file system check ...${DEF}"
+# disable swap 
+if ! grep -q "noswap" /boot/cmdline.txt; then
+ sudo sed -i '1 s/$/ fsck.mode=skip noswap/' /boot/cmdline.txt
+fi
+
+echo -e "${GREEN}Add tmpfs entries to /etc/fstab ...${DEF}"
+# move directories to RAM
+dirs=( "/tmp" "/var/log" "/var/tmp" "/var/lib/misc" "/var/cache")
+# special dirs used by vnstat and php
+dirs+=( "/var/lib/vnstat" "/var/php/sessions" )
+_dirs2tmpfs
+
+echo -e "${RED}You should reboot now ...${DEF}"
+