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Question

Using doctl in bash script

Posted April 23, 2018 3.3k views
UbuntuAPIBackups

I have this script so far:

#!/bin/bash
# script to create digitalocean droplet snapshot using their CLI, doctl.

# Function to set variable for snapshot name as date/time of creation.
timestamp() {
NAME=$(date)
}

timestamp

doctl compute droplet-action snapshot --snapshot-name "$NAME" 80750079

The script works with the result being a droplet snapshot with the date/time of creation as the name. However, I need to keep only 12 snapshots.

Somehow I need to count the number of existing snapshots and when I have 12, delete the oldest and add a new one.

How can I achieve that?

I run the script every two hours.

Any help would be greatly appreciated!

Thanks!

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By:
dwest100

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3 answers
dwest100 April 24, 2018

So this is the bashscript. Uses doctl to check how many snapshots exist, and when 24 exist, deletes the oldest one and creates the new one. Sends an log email to me with each new snapshot so I know it’s working. Repeats every hour. Maybe it’ll help someone. :)

#!/bin/bash
exec &> do_snapshot.log

timestamp() {
 NAME=$(date)
}

timestamp

SNAPSHOTS=$(/snap/bin/doctl compute image list-user --format "ID" --no-header | wc -l)

if [ "$SNAPSHOTS" -gt 23 ]; then
mapfile -t IDLIST < <(/snap/bin/doctl compute image list-user --format "ID" --no-header)

OLDEST=${IDLIST[0]}

/snap/bin/doctl compute image delete "$OLDEST"
fi

/snap/bin/doctl compute droplet-action snapshot --snapshot-name "$NAME" 8xxxxxxxxx9

mail -s "Digital Ocean Hourly Snapshot" my email@gmail.com < do_snapshot.log

rm do_snapshot.log

exit 0
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ryanpq April 23, 2018

I think that if you list your snapshots and split that result so that each result is a different item in an array you could do a for loop to count your results and if that number is over 12, delete the oldest.

Personally I would choose a more robust option than bash+doctl for this since it would be easier to deal with the snapshot results if you were using a library/class rather than a command line utility.

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  • dwest100 April 23, 2018

    Thanks for the reply. I actually came to the same conclusion after playing with doctl for a long while. I greatly appreciate the reply though!

    As to the more robust methods…I’m an oil painter lol!
    I’m just technical enough to create and manage my own site and VPS. Classes I haven’t wrapped my head around yet :)
    Plus I’m a geezer at 60.

    It’s fun though :)
    Thanks again for replying!
    Confirmed what I was thinking ;)

    If curious, naturepainter.art is my site. Nothing for sale there, just paintings :)

    Reply Report
dwest100 April 23, 2018

BTW, I’ll post the script when completed.

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