blkid | grep crypto

auto mounted to
    /dev/mapper/luks-<UUID> -> ../dm-0 (/dev/dm-0)

sudo cryptsetup
    luksUUID /dev/sdX
    luksOpen /dev/sdX <name>
        old syntax
    open /dev/sdX <name>
        new syntax
    close <name>
    luksDump /dev/sdX

files
/etc/crypttab
    https://averagelinuxuser.com/auto-mount-encrypted-partitions-at-boot/
        !!!
    sdX /dev/disk/by-uuid/<long-uuid> none luks

manual mount
    sudo cryptsetup luksOpen /dev/disk/by-uuid/<disk-uuid> luks-<uuid>
    sudo mount /dev/mapper/luks-<uuid> $MNT_DIR
https://ru.wikipedia.org/wiki/Fstab
https://www.computerhope.com/unix/umount.htm
    ! tons of help and samples
sudo mount /dev/sdX /data/crypted
    ! auto chown of /data/crypted to root:root
    /dev/mapper/luks-<uuid> /data/crypted ext4 defaults            0 0
    /dev/mapper/luks-<uuid> /data/crypted ext4 rw,user,exec,noauto 0 0
    /etc/fstab
        ...relatime, unhide, uid=...,gid=...,umask=...

auto-mount with key file
https://itectec.com/ubuntu/ubuntu-mount-luks-encrypted-hard-drive-at-boot/
https://www.howtoforge.com/automatically-unlock-luks-encrypted-drives-with-a-keyfile
https://withblue.ink/2020/01/19/auto-mounting-encrypted-drives-with-a-remote-key-on-linux.html
    ! systemd-service

2020
RoelVanDePaar - Ubuntu: How do I auto-mount LUKS partition?
    https://askubuntu.com/questions/1020390/how-do-i-auto-mount-luks-partition
    https://itectec.com/ubuntu/ubuntu-how-to-auto-mount-luks-partition/
    https://www.youtube.com/watch?v=bZqH45Mru50
    ! using pam-mount (libpam-mount)
    /etc/security/pam_mount.conf.xml

misc
https://superuser.com/questions/919590/dm-crypt-with-luks-etc-crypttab-using-either-keyfile-or-passphrase