Here is an example:

    # reduce writes to SD card
    tmpfs           /tmp            tmpfs   nosuid,nodev,size=100M         0       0
    tmpfs           /var/log        tmpfs   nosuid,nodev,nosuid,mode=0755,size=50M        0           0
    tmpfs		/var/log/nginx  tmpfs   nosuid,nodev,nosuid,mode=0755,size=20M	0	0
    tmpfs           /var/tmp        tmpfs   nosuid,nodev,size=10M         0       0
    tmpfs		/var/www/  tmpfs  nosuid,nodev,mode=0755,size=10M   0    0

Doo_Deux

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i m going to test on a hard drive but thks for the tip
