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merging in epoch date usage - allows script to be run more than once a day

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This commit is contained in:
Colin Johnson 2014-04-12 21:21:28 +00:00
parent 0257aedd3e
commit 476b4da4c0
2 changed files with 63 additions and 67 deletions
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4
ec2-automate-backup/ec2-automate-backup-awscli.sh
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@ -1,8 +1,8 @@
#!/bin/bash -
# Author: Colin Johnson / colin@cloudavail.com
# Contributors: buckelij / https://github.com/buckelij
# Date: 2014-03-02
# Version 0.1
# Date: 2014-04-12
# Version 0.9
# License Type: GNU GENERAL PUBLIC LICENSE, Version 3
#

116
ec2-automate-backup/ec2-automate-backup.sh
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@ -1,9 +1,18 @@
#!/bin/bash -
# Author: Colin Johnson / colin@cloudavail.com
# Date: 2013-02-13
# Version 0.9
# Date: 2014-04-12
# Version 0.10
# License Type: GNU GENERAL PUBLIC LICENSE, Version 3
#
# Author:
# Colin Johnson / https://github.com/colinbjohnson / colin@cloudavail.com
# Contributors:
# Alex Corley / https://github.com/anthroprose
# Jon Higgs / https://github.com/jonhiggs
# Mike / https://github.com/eyesis
# Jeff Vogt / https://github.com/jvogt
# Dave Stern / https://github.com/davestern
# Josef / https://github.com/J0s3f
# buckelij / https://github.com/buckelij
#confirms that executables required for succesful script execution are available
prerequisite_check()
{
@ -43,35 +52,34 @@ get_EBS_List()
then echo -e "An error occured when running ec2-describe-volumes. The error returned is below:\n$ebs_backup_list_complete" 1>&2 ; exit 70
fi
ebs_backup_list=`echo "$ebs_backup_list_complete" | grep ^VOLUME | cut -f 2`
#code to right will output list of EBS volumes to be backed up: echo -e "Now outputting ebs_backup_list:\n$ebs_backup_list"
}
create_EBS_Snapshot_Tags()
{
#snapshot tags holds all tags that need to be applied to a given snapshot - by aggregating tags we ensure that ec2-create-tags is called only onece
snapshot_tags=""
#if $name_tag_create is true then append ec2ab_${ebs_selected}_$date_current to the variable $snapshot_tags
#if $name_tag_create is true then append ec2ab_${ebs_selected}_$current_date to the variable $snapshot_tags
if $name_tag_create
then
# possible duplicate code ec2_snapshot_resource_id=`echo "$ec2_create_snapshot_result" | cut -f 2`
ec2_snapshot_resource_id=`echo "$ec2_create_snapshot_result" | cut -f 2`
snapshot_tags="$snapshot_tags --tag Name=ec2ab_${ebs_selected}_$date_current"
snapshot_tags="$snapshot_tags --tag Name=ec2ab_${ebs_selected}_$current_date"
fi
#if $hostname_tag_create is true then append --tag InitiatingHost=`hostname -f` to the variable $snapshot_tags
if $hostname_tag_create
then
snapshot_tags="$snapshot_tags --tag InitiatingHost='`hostname -f`'"
fi
#if $purge_after_days is true, then append $purge_after_date to the variable $snapshot_tags
if [[ -n $purge_after_days ]]
#if $purge_after_date_fe is true, then append $purge_after_date_fe to the variable $snapshot_tags
if [[ -n $purge_after_date_fe ]]
then
snapshot_tags="$snapshot_tags --tag PurgeAfter=$purge_after_date --tag PurgeAllow=true"
snapshot_tags="$snapshot_tags --tag PurgeAfterFE=$purge_after_date_fe --tag PurgeAllow=true"
fi
#if $user_tags is true, then append Volume=$ebs_selected and Created=$current_date to the variable $snapshot_tags
if $user_tags
then
snapshot_tags="$snapshot_tags --tag Volume=${ebs_selected} --tag Created=$date_current"
snapshot_tags="$snapshot_tags --tag Volume=${ebs_selected} --tag Created=$current_date"
fi
#if $snapshot_tags is not zero length then set the tag on the snapshot using ec2-create-tags
@ -81,7 +89,7 @@ create_EBS_Snapshot_Tags()
fi
}
date_binary_get()
get_date_binary()
{
#`uname -o (operating system) would be ideal, but OS X / Darwin does not support to -o option`
#`uname` on OS X defaults to `uname -s` and `uname` on GNU/Linux defaults to `uname -s`
@ -93,59 +101,46 @@ date_binary_get()
esac
}
get_purge_after_date()
get_purge_after_date_fe()
{
case $purge_after_input in
#any number of numbers followed by a letter "d" or "days" multiplied by 86400 (number of seconds in a day)
[0-9]*d) purge_after_value_seconds=$(( ${purge_after_input%?} * 86400 )) ;;
#any number of numbers followed by a letter "h" or "hours" multiplied by 3600 (number of seconds in an hour)
[0-9]*h) purge_after_value_seconds=$(( ${purge_after_input%?} * 3600 )) ;;
#any number of numbers followed by a letter "m" or "minutes" multiplied by 60 (number of seconds in a minute)
[0-9]*m) purge_after_value_seconds=$(( ${purge_after_input%?} * 60 ));;
#no trailing digits default is days - multiply by 86400 (number of minutes in a day)
*) purge_after_value_seconds=$(( $purge_after_input * 86400 ));;
esac
#based on the date_binary variable, the case statement below will determine the method to use to determine "purge_after_days" in the future
case $date_binary in
linux-gnu) echo `date -d +${purge_after_days}days -u +%Y-%m-%d` ;;
osx-posix) echo `date -v+${purge_after_days}d -u +%Y-%m-%d` ;;
*) echo `date -d +${purge_after_days}days -u +%Y-%m-%d` ;;
esac
}
get_purge_after_date_epoch()
{
#based on the date_binary variable, the case statement below will determine the method to use to determine "purge_after_date_epoch" in the future
case $date_binary in
linux-gnu) echo `date -d $purge_after_date +%s` ;;
osx-posix) echo `date -j -f "%Y-%m-%d" $purge_after_date "+%s"` ;;
*) echo `date -d $purge_after_date +%s` ;;
esac
}
get_date_current_epoch()
{
#based on the date_binary variable, the case statement below will determine the method to use to determine "date_current_epoch" in the future
case $date_binary in
linux-gnu) echo `date -d $date_current +%s` ;;
osx-posix) echo `date -j -f "%Y-%m-%d" $date_current "+%s"` ;;
*) echo `date -d $date_current +%s` ;;
linux-gnu) echo `date -d +${purge_after_value_seconds}sec -u +%s` ;;
osx-posix) echo `date -v +${purge_after_value_seconds}S -u +%s` ;;
*) echo `date -d +${purge_after_value_seconds}sec -u +%s` ;;
esac
}
purge_EBS_Snapshots()
{
#snapshot_tag_list is a string that contains all snapshots with either the key PurgeAllow or PurgeAfter set
snapshot_tag_list=`ec2-describe-tags --show-empty-fields --region $region --filter resource-type=snapshot --filter key=PurgeAllow,PurgeAfter`
#snapshot_tag_list is a string that contains all snapshots with either the key PurgeAllow or PurgeAfterFE set
snapshot_tag_list=`ec2-describe-tags --show-empty-fields --region $region --filter resource-type=snapshot --filter key=PurgeAllow,PurgeAfterFE`
#snapshot_purge_allowed is a list of all snapshot_ids with PurgeAllow=true
snapshot_purge_allowed=`echo "$snapshot_tag_list" | grep .*PurgeAllow'\s'true | cut -f 3`
for snapshot_id_evaluated in $snapshot_purge_allowed
do
#gets the "PurgeAfter" date which is in UTC with YYYY-MM-DD format (or %Y-%m-%d)
purge_after_date=`echo "$snapshot_tag_list" | grep .*$snapshot_id_evaluated'\s'PurgeAfter.* | cut -f 5`
#gets the "PurgeAfterFE" date which is in UTC with UNIX Time format (or xxxxxxxxxx / %s)
purge_after_date_fe_tag=`echo "$snapshot_tag_list" | grep .*$snapshot_id_evaluated'\s'PurgeAfterFE.* | cut -f 5`
#if purge_after_date is not set then we have a problem. Need to alert user.
if [[ -z $purge_after_date ]]
#Alerts user to the fact that a Snapshot was found with PurgeAllow=true but with no PurgeAfter date.
then echo "A Snapshot with the Snapshot ID $snapshot_id_evaluated has the tag \"PurgeAllow=true\" but does not have a \"PurgeAfter=YYYY-MM-DD\" date. $app_name is unable to determine if $snapshot_id_evaluated should be purged." 1>&2
if [[ -z $purge_after_date_fe_tag ]]
#Alerts user to the fact that a Snapshot was found with PurgeAllow=true but with no PurgeAfterFE date.
then echo "A Snapshot with the Snapshot ID $snapshot_id_evaluated has the tag \"PurgeAllow=true\" but does not have a \"PurgeAfterFE=xxxxxxxxxx\" date where PurgeAfterFE is UNIX time. $app_name is unable to determine if $snapshot_id_evaluated should be purged." 1>&2
else
#convert both the date_current and purge_after_date into epoch time to allow for comparison
date_current_epoch=`get_date_current_epoch`
purge_after_date_epoch=`get_purge_after_date_epoch`
#perform compparison - if $purge_after_date_epoch is a lower number than $date_current_epoch than the PurgeAfter date is earlier than the current date - and the snapshot can be safely removed
if [[ $purge_after_date_epoch < $date_current_epoch ]]
#perform comparison - if $purge_after_date_epoch is a lower number than $current_date_epoch than the PurgeAfterFE date is earlier than the current date - and the snapshot can be safely removed
if [[ $purge_after_date_fe_tag < $current_date ]]
then
echo "The snapshot \"$snapshot_id_evaluated\" with the Purge After date of $purge_after_date will be deleted."
echo "The snapshot \"$snapshot_id_evaluated\" with the PurgeAfterFE date of $purge_after_date_fe_tag will be deleted."
ec2-delete-snapshot --region $region $snapshot_id_evaluated
fi
fi
@ -161,9 +156,9 @@ date_binary=""
name_tag_create=false
#sets the "InitiatingHost" tag set for a snapshot to false
hostname_tag_create=false
#sets the user_tags feature to false - user_tag creates tags on snapshots - by default each snapshot is tagged with volume_id and current_data timestamp
#sets the user_tags feature to false - user_tag creates tags on snapshots - by default each snapshot is tagged with volume_id and current_date timestamp
user_tags=false
#sets the Purge Snapshot feature to false - this feature will eventually allow the removal of snapshots that have a "PurgeAfter" tag that is earlier than current date
#sets the Purge Snapshot feature to false - this feature will eventually allow the removal of snapshots that have a "PurgeAfterFE" tag that is earlier than current date
purge_snapshots=false
#handles options processing
@ -175,7 +170,7 @@ while getopts :s:c:r:v:t:k:pnhu opt
r) region="$OPTARG";;
v) volumeid="$OPTARG";;
t) tag="$OPTARG";;
k) purge_after_days="$OPTARG";;
k) purge_after_input="$OPTARG";;
n) name_tag_create=true;;
h) hostname_tag_create=true;;
p) purge_snapshots=true;;
@ -208,16 +203,17 @@ fi
prerequisite_check
#sets date variable
date_current=`date -u +%Y-%m-%d`
#sets the PurgeAfter tag to the number of days that a snapshot should be retained
if [[ -n $purge_after_days ]]
current_date=`date -u +%s`
#sets the PurgeAfterFE tag to the number of seconds that a snapshot should be retained
if [[ -n $purge_after_input ]]
then
#if the date_binary is not set, call the date_binary_get function
#if the date_binary is not set, call the get_date_binary function
if [[ -z $date_binary ]]
then date_binary_get
then get_date_binary
fi
purge_after_date=`get_purge_after_date`
echo "Snapshots taken by $app_name will be eligible for purging after the following date: $purge_after_date."
purge_after_date_fe=`get_purge_after_date_fe`
echo "Snapshots taken by $app_name will be eligible for purging after the following date (the purge after date given in seconds from epoch): $purge_after_date_fe."
fi
#get_EBS_List gets a list of EBS instances for which a snapshot is desired. The list of EBS instances depends upon the selection_method that is provided by user input
@ -226,7 +222,7 @@ get_EBS_List
#the loop below is called once for each volume in $ebs_backup_list - the currently selected EBS volume is passed in as "ebs_selected"
for ebs_selected in $ebs_backup_list
do
ec2_snapshot_description="ec2ab_${ebs_selected}_$date_current"
ec2_snapshot_description="ec2ab_${ebs_selected}_$current_date"
ec2_create_snapshot_result=`ec2-create-snapshot --region $region -d $ec2_snapshot_description $ebs_selected 2>&1`
if [[ $? != 0 ]]
then echo -e "An error occured when running ec2-create-snapshot. The error returned is below:\n$ec2_create_snapshot_result" 1>&2 ; exit 70