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Code Issues Releases Wiki Activity

backups: predict when the next backup will occur

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This commit is contained in:
Joshua Tauberer 2015-03-08 20:55:39 +00:00
parent b539c2df70
commit c18d58b13f
3 changed files with 24 additions and 3 deletions
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1
CHANGELOG.md
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@ -15,6 +15,7 @@ System:
Control panel:
* The new check that system services are running mistakenly checked that the Dovecot Managesieve service is publicly accessible. Although the service binds to the public network interface we don't open the port in ufw. On some machines it seems that ufw blocks the connection from the status checks (which seems correct) and on some machines (mine) it doesn't, which is why I didn't notice the problem.
* The current backup chain will now try to predict how many days until it is deleted (always at least 3 days after the next full backup).
v0.07 (February 28, 2015)
-------------------------

22
management/backup.py
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@ -67,9 +67,29 @@ def backup_status(env):
# This is relied on by should_force_full() and the next step.
backups = sorted(backups.values(), key = lambda b : b["date"], reverse=True)
# Get the average size of incremental backups and the size of the
# most recent full backup.
incremental_count = 0
incremental_size = 0
first_full_size = None
for bak in backups:
if bak["full"]:
first_full_size = bak["size"]
break
incremental_count += 1
incremental_size += bak["size"]
# Predict how many more increments until the next full backup,
# and add to that the time we hold onto backups, to predict
# how long the most recent full backup+increments will be held
# onto. Round up since the backup occurs on the night following
# when the threshold is met.
deleted_in = None
if incremental_count > 0 and first_full_size is not None:
deleted_in = "approx. %d days" % round(keep_backups_for_days + (.5 * first_full_size - incremental_size) / (incremental_size/incremental_count) + .5)
# When will a backup be deleted?
saw_full = False
deleted_in = None
days_ago = now - datetime.timedelta(days=keep_backups_for_days)
for bak in backups:
if deleted_in:

4
management/templates/system-backup.html
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@ -15,7 +15,7 @@
<h3>Current Backups</h3>
<p>The backup directory currently contains the backups listed below. The total size on disk of the backups is <span id="backup-total-size"></span>.</p>
<p>The backup directory currently contains the backups listed below. The total size on disk of the backups is currently <span id="backup-total-size"></span>.</p>
<table id="backup-status" class="table" style="width: auto">
<thead>
@ -76,7 +76,7 @@ function show_system_backup() {
if (b.deleted_in)
tr.append( $('<td/>').text(b.deleted_in) );
else
tr.append( $('<td class="text-muted">n/a</td>') );
tr.append( $('<td class="text-muted">unknown</td>') );
$('#backup-status tbody').append(tr);
total_disk_size += b.size;