mikrotik_snippets/xubuntu-read-only-filesystem.txt

XUbuntu 16.04 with read only filesystem for use with SSD disk
---------------------------------------------------------------

* Example:
    /dev/sda: HDD disk (mechanical disk)
    /dev/sdc: SSD disk (solid state disk)
    /dev/sdc1: /
    /dev/sda2: /home /tmp /var/tmp
    /dev/sda3: swap

* Install XUbuntu 16.04 in /dev/sdc1.

* mkdir /hddsda2

* mount /dev/sda2 /hddsda2

* mkdir /hddsda2/tmp

* chmod 1777 /hddsda2/tmp

* mkdir -p /hddsda2/home/username

* rsync -av /home/username/ /hddsda2/home/username/

* chmod 0700 /hddsda2/home/username

* chown -R username.username /hddsda2/home/username

* blkid
    /dev/sda1: UUID="D4EA43ACEA438A26" TYPE="ntfs"
    /dev/sda2: UUID="c1a48592-1d54-4b61-822b-e02ce0c8094d" TYPE="ext4"
    /dev/sda3: UUID="7af9d5db-eac4-49f1-aafd-3cb82f08c9df" TYPE="swap"
    /dev/sdc1: UUID="9d0a8f06-d686-4a6d-97d5-2320598335fb" TYPE="ext4"

* /etc/fstab
    UUID=9d0a8f06-d686-4a6d-97d5-2320598335fb   /               ext4    ro,noatime,errors=remount-ro    0       1
    UUID=c1a48592-1d54-4b61-822b-e02ce0c8094d   /hddsda2        ext4    rw,noatime,errors=remount-ro    0       1
    UUID=7af9d5db-eac4-49f1-aafd-3cb82f08c9df   none            swap    sw                              0       0
    tmpfs               /var/lib/lightdm        tmpfs           nosuid,nodev,mode=0750,rw,size=32M,uid=lightdm,gid=lightdm      0       0
    tmpfs               /var/log                tmpfs           nosuid,nodev,mode=0777,rw,size=32M,uid=root,gid=syslog          0       0
    /hddsda2/home       /home                   none            bind                                    0       0
    /hddsda2/tmp        /tmp                    none            bind                                    0       0
    /hddsda2/tmp        /var/tmp                none            bind                                    0       0
    /var/log            /media                  none            bind                                    0       0
    /var/log            /var/spool              none            bind                                    0       0
    /var/log            /var/lib/blueman        none            bind                                    0       0
    /var/lib/lightdm    /var/lib/lightdm-data   none            bind                                    0       0

* /usr/local/bin/remountrw
    mount -o remount,rw /

* /usr/local/bin/remountro
    sync
    sleep 1
    mount -o remount,ro /

* Issues:
    * The guest session not work: /etc/password and /etc/shadow are read only.
    * Lightdm can not remember the last user logged.

* Network Manager: wired connection with fixed IP address:
    * Create and chmod 600 the file:
        "/etc/NetworkManager/system-connections/Wired Connection"

        [ethernet]
        duplex=full
        mac-address=xx:xx:xx:xx:xx:xx

        [connection]
        id=Wired Connection
        uuid=66b010e7-d2b0-4e5a-a2d8-f1d8191a241d
        type=ethernet
        timestamp=1440124541

        [ipv6]
        method=auto
        ip6-privacy=0

        [ipv4]
        method=manual
        dns=<IP_ADDRESS>;
        address1=<IP_ADDRESS>/<MASK 0-30>,<DEFAULT_GATEWAY>
        may-fail=false