Verified Commit 8422d79b authored by Adam Caprez's avatar Adam Caprez
Browse files

Add instructions on using a volume with mysql.

parent 3a7806d5
title = "Connecting to MySQL instances"
description = "How to connect to MySQL-based instances"
title = "Using MySQL instances"
description = "How to connect to and use MySQL-based instances"
{{% notice info %}}
......@@ -141,3 +141,56 @@ Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
{{< /highlight >}}
### Using a volume to store the database
By default, the database is stored on the instance's virtual disk. The amount of space
available may not be sufficient for larger databases, so a _Volume_ may be used instead.
All of the following setup commands need to be run as `root` in the instance after
connecting via SSH from either [Windows]({{< relref "connecting_to_linux_instances_from_windows" >}})
or [Mac]({{< relref "connecting_to_linux_instances_from_mac" >}}).
{{% panel theme="danger" header="**Running commands as root**" %}}**Extreme care should be taken when running commands as `root.`** It is very easy to permanently delete data or cause irreparable damage to your instance.{{% /panel %}}
In order to use a volume, first follow the instructions to
[create and attach a volume]({{< relref "creating_and_attaching_a_volume" >}}) to your
instance MySQL instance. Next, proceed with [formatting and mounting the volume]({{< relref "formatting_and_mounting_a_volume_in_linux" >}})
in your instance. If all the steps complete without errors, you should have your volume mounted at `/mnt/myvolume`.
Next, the MySQL server needs to be stopped and the existing contents of its storage directory copied to the volume:
{{< highlight bash >}}
service mysql stop
rsync -av /var/lib/mysql/ /mnt/myvolume/
{{< /highlight >}}
Now the volume can be unmounted from `/mnt/myvolume` and remounted over the existing `/var/lib/mysql` location:
{{< highlight bash >}}
umount /mnt/myvolume
mount /dev/vdb1 /var/lib/mysql
{{< /highlight >}}
Running the `df -h` command should show the `/var/lib/mysql` location as mounted from `/dev/vdb1` with the
increased storage amount:
{{< highlight bash >}}
/dev/vdb1 99G 183M 94G 1% /var/lib/mysql
{{< /highlight >}}
In this example the volume size is 100GB. In general, it should be approximately the same size as your volume.
Finally, restart the MySQL server:
{{< highlight bash >}}
service mysql start
{{< /highlight >}}
Assuming the `service` command doesn't return an error, the increased space is now available for use.
The last step is to ensure the volume gets mounted automatically after the instance is rebooted. To
enable this, add the following line to the `/etc/fstab` file:
{{< highlight bash >}}
/dev/vdb1 /var/lib/mysql ext4 defaults 0 0
{{< /highlight >}}
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