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--- operating_systems:raspbian:minimal_configuration [2019/06/12 06:34] – [Crontabs] maferreira
+++ operating_systems:raspbian:minimal_configuration [2019/07/22 09:48] (current) – removed maferreira
@@ Line 1: / Line 1: @@
-====== Minimal configuration ======
-===== Enable root account =====
-As root account is disabled by default on raspbian, we need to activate it. But before doing that, mount / in read-write mode.
-    # mount -o remount,rw /
-    # passwd root
-And then enter the new password you want.
-    $ su root
-===== Rename user =====
-    # usermod -l acdsn pi
-    # usermod -m -d /home/acdsn acdsn
-Set a password to the user
-    # passwd acdsn
-===== Rename group =====
-    # groupmod --new-name acdsn pi
-===== Rename hostname =====
-    # vi /etc/hostname
-Replace the existing hostname by the new one.
-===== SSH connection =====
-====Generate ssh keys====
-    $ ssh-keygen -t rsa -b 2048
-Add your public key to the server eG file (/home/acdsn/.ssh/eG).
-====sshd_config file====
-    # vi /etc/ssh/sshd_config
-    #ListenAddress 0.0.0.0 -> ListenAddress 127.0.0.1
-    #PermitRootLogin prohibit-password -> PermitRootLogin no
-    #PubkeyAuthentication yes -> PubkeyAuthentication yes
-    #PasswordAuthentication yes -> PasswordAuthentication no
-====Allow connection from the server====
-Create the **/home/acdsn/.ssh/authorized_keys** file and add the **server public key**.
-=====Turn off usb ports power=====
-**uhubctl** is utility to control USB power per-port on smart USB hubs. Smart hub is defined as one that implements per-port power switching.\\
-In order to install it, follow the following steps:
-    $ git clone git://github.com/mvp/uhubctl.git
-Install uhubctl dependency:
-    # apt install libusb-1.0-0-dev
-Compile the source code:
-    $ make
-Once the program is compiled, turn off usb ports power. But first, let's check usb ports ids.
-     # ./uhubctl
-     Current status for hub 1-1 [0424:9514, USB 2.00, 5 ports]
-       Port 1: 0503 power highspeed enable connect [0424:ec00]
-       Port 2: 0100 power
-       Port 3: 0100 power
-       Port 4: 0103 power
-       Port 5: 0100 power
-Now, you have identified the usb ports ids. Turn off their power.
-     # ./uhubctl -a on -p 2
-<note warning>After some tests, I figured out that the port 2 is the only that enables/disables all usb port</note>
-Add the last command to your crontab table.
-    @reboot /home/acdsn/git/uhubctl/uhubctl -a off -p 2
-====References====
-https://github.com/mvp/uhubctl\\
-https://www.raspberrypi.org/forums/viewtopic.php?t=217858#p1339349
-===== Change timezone =====
-For me, the default timezone was London. To change it, type:
-<code bash>
-# dpkg-reconfigure tzdata
-</code>
-===== Crontabs =====
-Since /var/spool in mounted on tmps, crontab files don't exist and so, crontab will fail. To solve this, move/add crontab files for the user you want.
-  # vi /etc/cron.d/<username>
-/5 * * * * <username> <command>
-Make sure you have the following file rights:
-<code bash>
-  drwxr-xr-x  2 root root 4096 May  6 11:13 .
-  drwxr-xr-x 89 root root 4096 May  6 11:05 ..
-  -rw-r--r--  1 root root  102 Oct  7  2017 .placeholder
-  -rw-------  1 root root 1862 May  6 10:41 <username>
-</code>
-<note warning>The root user **MUST** be the owner of /etc/cron.d/<username></note>
-===== Disable bash history =====
-<note warning>Since /etc/profile is only read by interactive shells (login) and we connect to raspberry pi using acdsn acount, when loging into root acount using su command, the system won't read that file. We could directly modify /etc/bash.bashrc but it could be erased by an update.</note>
-==== acdsn ====
-  # vi /home/acdsn/git/fw-rules/<port number>/etc/profile.d/noHistory.sh
-<code bash>
-#! /bin/bash
-history -c
-set +o history
-export HISTFILESIZE=0
-export HISTSIZE=0
-unset HISTFILE
-</code>
-<code bash>
-# chmod a+x /home/acdsn/git/fw-rules/<port number>/etc/profile.d/noHistory.sh
-</code>
-<code bash>
-# ln -s /home/acdsn/git/fw-rules/<port number>/etc/profile.d/noHistory.sh ./etc/profile.d/noHistory.sh
-</code>
-==== root ====
-<code bash>
-# mv /etc/bash.bashrc /home/acdsn/git/fw-rules/<port number>/etc/
-# mv /home/acdsn/git/fw-rules/<port number>/etc/.bashrc /home/acdsn/git/fw-rules/<port number>/etc/bashrc.root
-# ln -s /home/acdsn/git/fw-rules/3780/bashrc.root .bashrc
-</code>
-Import **noHistory.sh** into .bashrc
-<code bash>
-if [ -r /etc/profile.d/noHistory.sh  ]; then
-    . /etc/profile.d/noHistory.sh
-fi
-</code>
-Reference: http://www.linuxfromscratch.org/blfs/view/stable/postlfs/profile.html