By default Dokku have to directory /home/dokku and /var/lib/dokku/. How can i store it in block storage? Purpose in future if upgrade process of the host machine fail i can just unattached block storage, start new droplet, install dokku, mount block storage and all done...
You can read the guide below to setup your block storage:
From there, you have a few options: symlink directories or mount them. But before you do anything below, make sure you backup backup backup. Once you rm -rf a directory, it's gone and it's not coming back.
1). Symlink Directories
Since /home/dokku is the current home directory, you would simply create a new directory on the block storage device:
mkdir -p /path/to/block/device/dokku
Copy current data from /home/dokku to the new location:
cp -R /home/dokku/* /path/to/block/storage/dokku
NOTE: Before the next step, make sure all data was successfully copied to the new directory!
Now delete the current directory and create a symlink to the new one:
sudo rm -rf /home/dokku
sudo ln -s /home/dokku /path/to/block/storage/dokku
2). Mount Directories
mkdir -p /path/to/block/device/dokku
Copy current data from /home/dokku to the new location:
cp -R /home/dokku/* /path/to/block/storage/dokku
NOTE: Before the next step, make sure all data was successfully copied to the new directory!
Now delete the current directory and mount to the new one:
sudo rm -rf /home/dokku
sudo mount --bind /home/dokku /path/to/block/storage/dokku
Now this is NOT permanent, so you need to modify fstab and place an entry in there as well:
nano /etc/fstab
and paste in:
/home/dokku /path/to/block/storage/dokku none bind
Instead of copying files is better to move the folder
mv /home/dokku /path/to/block/storage/
When it says "Now delete the current directory and mount to the new one:" the command shuld be:
sudo rm -rf /home/dokku
mkdir /home/dokku
sudo mount --bind /path/to/block/storage/dokku /home/dokku
and /etc/fstab should be
/path/to/block/storage/dokku /home/dokku none bind