feat: Support multiple volumes on virtual machines #2287
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These are argument for the `mount` command (and /etc/fstab)
/var/lib/mysql and /etc/mysql for Database Server /home/frappe/benches for Server
…used If MariaDB gets activated, then mounts will be activated as well. If one of the mounts fails to activate, MariaDB will not be started. If one of the mounts is explicitly stopped (or restarted), MariaDB will be stopped (or restarted). If one of the mounts are stopped, MariaDB will be stopped too. The mounts strictly have to be in active state for MariaDB to also be in active state. Reference: https://www.freedesktop.org/software/systemd/man/latest/systemd.unit.html#BindsTo=
The mount strictly has to be in active state for Docker to also be in active state. Reference: https://www.freedesktop.org/software/systemd/man/latest/systemd.unit.html#BindsTo=
Converts None to "" instead of "None"
EBS Volume ID will change when we start a new machine from an image. Since the ID is only known after the machine boots. We have to wait for the machine to boot and then run a playbook to reconfigure the mount. But UUID remains the same. so, we don't need to change anything in the new machine at the first boot. Reference: https://aws.amazon.com/blogs/compute/how-to-mount-linux-volume-and-keep-mount-point-consistency/
/home/frappe/benches directory needs to be owned by frappe There are other ways of doing this. But this seems useful.
mysql user isn't created when volumes are mounted
So, create the source mount point with the correct permissions and ownership
TODO: Guess platform from instance_type
Codecov ReportAttention: Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## master #2287 +/- ##
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- Coverage 39.91% 39.87% -0.05%
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Files 372 373 +1
Lines 28225 28341 +116
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+ Hits 11267 11300 +33
- Misses 16958 17041 +83 ☔ View full report in Codecov by Sentry. |
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Currently, we place all the data on a single EBS volume (root partition). This feature supports placing some of the data on another volume.
So that, we can
By default, the "movable" data is placed on a separate volume
Instead of directly mounting the filesystem to /var/lib/mysql. We mount it to /opt/volumes/mariadb and then bind mount /opt/volumes/mariadb/var/lib/mysql to /var/lib/mysql. This gets us two things.
To guarantee mount point consistency we use UUID in fstab (instead of device name or volume IDs). Data volumes are unpartitioned and ext4 formatted.
This feature is built to make moving from Intel -> ARM easy.