Read this article which explains the problem, the cause and solutions.
Cloning RaspberryPi SD Cards
https://github.com/billw2/rpi-clone
For what I want I just use the command:
$ rpi-clone sda
This clones the current bootable SD Card to the SD Card in the USB port.
nginx – basics
This is a quick aid based on the Raspberry Pi documentation.
Some basic commands are:
sudo nginx -s reload sudo nano /etc/nginx/nginx.conf systemctl status nginx.service
Cannot synchronise MLAT with Piaware?
Possibly an issue with Pi firmware of 4.9.x, find out your version by using this command
uname -a
If so then issue these commands, the first installs the firmware updater the second the 4.4.50 version of the firmware.
sudo apt-get install rpi-update sudo rpi-update 52241088c1da59a359110d39c1875cda56496764
If you can’t install the firmware because you have a “custom” kernel then you’ll have to get the latest version of Raspbian and install that, then run the above two commands.
Reducing wear on your sd-card
One way to increase the lifespan, and presumably, reliability of the sd-card, currently being hammered, in your Pi is to put some of the temporary files into memory.
Add the following to your /etc/fstab
tmpfs /var/log tmpfs nodev,nosuid,size=50M 0 0
If the size isn’t specified then half of the machine’s memory is used.
nodev and nosuid are security options, the suggestion is that these only need setting for public facing machines.
8-Jan-2018: If you’re using the lighttpd web server then be aware that it stores files in /var/log, and it doesn’t like them being removed. This will cause the server to fail to start.
Install Synaptic package manager on the Raspberry Pi
To install a GUI package manager use:
sudo apt-get install synaptic