Adding a bind mount for etcd
The etcd servers need to have a fast disk to read/write from. They are saving their data to /var/lib/etcd so to handle this a new ssd was added to the system.
Looking at the fstab, the new SSD is mounted in /mnt/ssd
...
UUID=SOMEGUID /mnt/ssd ext4 defaults,nofail 0 0
...
To add a bind mount for etcd's directory first folders are needed for storing the data:
$ sudo mkdir /mnt/ssd/etcd
$ sudo mkdir /var/lib/etcd
Then a new bind mount is added to /etc/fstab
/mnt/ssd/etcd /var/lib/etcd none bind,nofail 0 0
Then the filesystem is mounted and tested:
$ sudo mount /var/lib/etcd/
$ sudo touch /var/lib/etcd/test.txt
$ ls /mnt/ssd/etcd/
test.txt
$ sudo rm /mnt/ssd/etcd/test.txt
$ ls /var/lib/etcd/