merging in epoch date usage - allows script to be run more than once a day
This commit is contained in:
Colin Johnson
parent
0257aedd3e
commit
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@ -1,8 +1,8 @@
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#!/bin/bash -
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# Author: Colin Johnson / colin@cloudavail.com
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# Contributors: buckelij / https://github.com/buckelij
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# Date: 2014-03-02
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# Version 0.1
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# Date: 2014-04-12
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# Version 0.9
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# License Type: GNU GENERAL PUBLIC LICENSE, Version 3
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#
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@ -1,9 +1,18 @@
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#!/bin/bash -
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# Author: Colin Johnson / colin@cloudavail.com
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# Date: 2013-02-13
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# Version 0.9
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# Date: 2014-04-12
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# Version 0.10
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# License Type: GNU GENERAL PUBLIC LICENSE, Version 3
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#
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# Author:
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# Colin Johnson / https://github.com/colinbjohnson / colin@cloudavail.com
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# Contributors:
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# Alex Corley / https://github.com/anthroprose
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# Jon Higgs / https://github.com/jonhiggs
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# Mike / https://github.com/eyesis
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# Jeff Vogt / https://github.com/jvogt
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# Dave Stern / https://github.com/davestern
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# Josef / https://github.com/J0s3f
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# buckelij / https://github.com/buckelij
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#confirms that executables required for succesful script execution are available
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prerequisite_check()
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{
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@ -27,7 +36,7 @@ get_EBS_List()
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fi
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ebs_selection_string="$volumeid"
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;;
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tag)
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tag)
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if [[ -z $tag ]]
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then echo "The selected selection_method \"tag\" (-s tag) requires a valid tag (-t key=value) for operation. Correct usage is as follows: \"-s tag -t backup=true\" or \"-s tag -t Name=my_tag.\"" 1>&2 ; exit 64
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fi
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@ -43,35 +52,34 @@ get_EBS_List()
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then echo -e "An error occured when running ec2-describe-volumes. The error returned is below:\n$ebs_backup_list_complete" 1>&2 ; exit 70
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fi
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ebs_backup_list=`echo "$ebs_backup_list_complete" | grep ^VOLUME | cut -f 2`
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#code to right will output list of EBS volumes to be backed up: echo -e "Now outputting ebs_backup_list:\n$ebs_backup_list"
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}
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create_EBS_Snapshot_Tags()
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{
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#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
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snapshot_tags=""
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#if $name_tag_create is true then append ec2ab_${ebs_selected}_$date_current to the variable $snapshot_tags
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#if $name_tag_create is true then append ec2ab_${ebs_selected}_$current_date to the variable $snapshot_tags
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if $name_tag_create
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then
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# possible duplicate code ec2_snapshot_resource_id=`echo "$ec2_create_snapshot_result" | cut -f 2`
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ec2_snapshot_resource_id=`echo "$ec2_create_snapshot_result" | cut -f 2`
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snapshot_tags="$snapshot_tags --tag Name=ec2ab_${ebs_selected}_$date_current"
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snapshot_tags="$snapshot_tags --tag Name=ec2ab_${ebs_selected}_$current_date"
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fi
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#if $hostname_tag_create is true then append --tag InitiatingHost=`hostname -f` to the variable $snapshot_tags
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if $hostname_tag_create
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then
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snapshot_tags="$snapshot_tags --tag InitiatingHost='`hostname -f`'"
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fi
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#if $purge_after_days is true, then append $purge_after_date to the variable $snapshot_tags
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if [[ -n $purge_after_days ]]
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#if $purge_after_date_fe is true, then append $purge_after_date_fe to the variable $snapshot_tags
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if [[ -n $purge_after_date_fe ]]
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then
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snapshot_tags="$snapshot_tags --tag PurgeAfter=$purge_after_date --tag PurgeAllow=true"
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snapshot_tags="$snapshot_tags --tag PurgeAfterFE=$purge_after_date_fe --tag PurgeAllow=true"
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fi
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#if $user_tags is true, then append Volume=$ebs_selected and Created=$current_date to the variable $snapshot_tags
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if $user_tags
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then
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snapshot_tags="$snapshot_tags --tag Volume=${ebs_selected} --tag Created=$date_current"
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snapshot_tags="$snapshot_tags --tag Volume=${ebs_selected} --tag Created=$current_date"
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fi
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#if $snapshot_tags is not zero length then set the tag on the snapshot using ec2-create-tags
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@ -81,7 +89,7 @@ create_EBS_Snapshot_Tags()
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fi
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}
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date_binary_get()
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get_date_binary()
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{
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#`uname -o (operating system) would be ideal, but OS X / Darwin does not support to -o option`
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#`uname` on OS X defaults to `uname -s` and `uname` on GNU/Linux defaults to `uname -s`
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@ -93,59 +101,46 @@ date_binary_get()
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esac
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}
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get_purge_after_date()
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get_purge_after_date_fe()
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{
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case $purge_after_input in
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#any number of numbers followed by a letter "d" or "days" multiplied by 86400 (number of seconds in a day)
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[0-9]*d) purge_after_value_seconds=$(( ${purge_after_input%?} * 86400 )) ;;
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#any number of numbers followed by a letter "h" or "hours" multiplied by 3600 (number of seconds in an hour)
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[0-9]*h) purge_after_value_seconds=$(( ${purge_after_input%?} * 3600 )) ;;
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#any number of numbers followed by a letter "m" or "minutes" multiplied by 60 (number of seconds in a minute)
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[0-9]*m) purge_after_value_seconds=$(( ${purge_after_input%?} * 60 ));;
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#no trailing digits default is days - multiply by 86400 (number of minutes in a day)
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*) purge_after_value_seconds=$(( $purge_after_input * 86400 ));;
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esac
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#based on the date_binary variable, the case statement below will determine the method to use to determine "purge_after_days" in the future
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case $date_binary in
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linux-gnu) echo `date -d +${purge_after_days}days -u +%Y-%m-%d` ;;
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osx-posix) echo `date -v+${purge_after_days}d -u +%Y-%m-%d` ;;
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*) echo `date -d +${purge_after_days}days -u +%Y-%m-%d` ;;
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esac
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}
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get_purge_after_date_epoch()
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{
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#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
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case $date_binary in
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linux-gnu) echo `date -d $purge_after_date +%s` ;;
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osx-posix) echo `date -j -f "%Y-%m-%d" $purge_after_date "+%s"` ;;
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*) echo `date -d $purge_after_date +%s` ;;
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esac
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}
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get_date_current_epoch()
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{
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#based on the date_binary variable, the case statement below will determine the method to use to determine "date_current_epoch" in the future
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case $date_binary in
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linux-gnu) echo `date -d $date_current +%s` ;;
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osx-posix) echo `date -j -f "%Y-%m-%d" $date_current "+%s"` ;;
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*) echo `date -d $date_current +%s` ;;
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linux-gnu) echo `date -d +${purge_after_value_seconds}sec -u +%s` ;;
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osx-posix) echo `date -v +${purge_after_value_seconds}S -u +%s` ;;
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*) echo `date -d +${purge_after_value_seconds}sec -u +%s` ;;
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esac
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}
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purge_EBS_Snapshots()
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{
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#snapshot_tag_list is a string that contains all snapshots with either the key PurgeAllow or PurgeAfter set
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snapshot_tag_list=`ec2-describe-tags --show-empty-fields --region $region --filter resource-type=snapshot --filter key=PurgeAllow,PurgeAfter`
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#snapshot_tag_list is a string that contains all snapshots with either the key PurgeAllow or PurgeAfterFE set
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snapshot_tag_list=`ec2-describe-tags --show-empty-fields --region $region --filter resource-type=snapshot --filter key=PurgeAllow,PurgeAfterFE`
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#snapshot_purge_allowed is a list of all snapshot_ids with PurgeAllow=true
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snapshot_purge_allowed=`echo "$snapshot_tag_list" | grep .*PurgeAllow'\s'true | cut -f 3`
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for snapshot_id_evaluated in $snapshot_purge_allowed
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do
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#gets the "PurgeAfter" date which is in UTC with YYYY-MM-DD format (or %Y-%m-%d)
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purge_after_date=`echo "$snapshot_tag_list" | grep .*$snapshot_id_evaluated'\s'PurgeAfter.* | cut -f 5`
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#gets the "PurgeAfterFE" date which is in UTC with UNIX Time format (or xxxxxxxxxx / %s)
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purge_after_date_fe_tag=`echo "$snapshot_tag_list" | grep .*$snapshot_id_evaluated'\s'PurgeAfterFE.* | cut -f 5`
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#if purge_after_date is not set then we have a problem. Need to alert user.
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if [[ -z $purge_after_date ]]
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#Alerts user to the fact that a Snapshot was found with PurgeAllow=true but with no PurgeAfter date.
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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
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if [[ -z $purge_after_date_fe_tag ]]
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#Alerts user to the fact that a Snapshot was found with PurgeAllow=true but with no PurgeAfterFE date.
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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
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else
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#convert both the date_current and purge_after_date into epoch time to allow for comparison
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date_current_epoch=`get_date_current_epoch`
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purge_after_date_epoch=`get_purge_after_date_epoch`
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#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
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if [[ $purge_after_date_epoch < $date_current_epoch ]]
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#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
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if [[ $purge_after_date_fe_tag < $current_date ]]
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then
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echo "The snapshot \"$snapshot_id_evaluated\" with the Purge After date of $purge_after_date will be deleted."
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echo "The snapshot \"$snapshot_id_evaluated\" with the PurgeAfterFE date of $purge_after_date_fe_tag will be deleted."
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ec2-delete-snapshot --region $region $snapshot_id_evaluated
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fi
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fi
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@ -161,9 +156,9 @@ date_binary=""
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name_tag_create=false
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#sets the "InitiatingHost" tag set for a snapshot to false
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hostname_tag_create=false
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#sets the user_tags feature to false - user_tag creates tags on snapshots - by default each snapshot is tagged with volume_id and current_data timestamp
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#sets the user_tags feature to false - user_tag creates tags on snapshots - by default each snapshot is tagged with volume_id and current_date timestamp
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user_tags=false
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#sets the Purge Snapshot feature to false - this feature will eventually allow the removal of snapshots that have a "PurgeAfter" tag that is earlier than current date
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#sets the Purge Snapshot feature to false - this feature will eventually allow the removal of snapshots that have a "PurgeAfterFE" tag that is earlier than current date
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purge_snapshots=false
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#handles options processing
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@ -175,7 +170,7 @@ while getopts :s:c:r:v:t:k:pnhu opt
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r) region="$OPTARG";;
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v) volumeid="$OPTARG";;
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t) tag="$OPTARG";;
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k) purge_after_days="$OPTARG";;
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k) purge_after_input="$OPTARG";;
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n) name_tag_create=true;;
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h) hostname_tag_create=true;;
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p) purge_snapshots=true;;
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@ -186,7 +181,7 @@ while getopts :s:c:r:v:t:k:pnhu opt
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#sources "cron_primer" file for running under cron or other restricted environments - this file should contain the variables and environment configuration required for ec2-automate-backup to run correctly
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if [[ -n $cron_primer ]]
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then if [[ -f $cron_primer ]]
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then if [[ -f $cron_primer ]]
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then source $cron_primer
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else
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echo "Cron Primer File \"$cron_primer\" Could Not Be Found." 1>&2 ; exit 70
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@ -197,7 +192,7 @@ fi
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if [[ -z $region ]]
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#if the environment variable $EC2_REGION is not set set to us-east-1
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then if [[ -z $EC2_REGION ]]
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#if both
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#if both
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then region="us-east-1"
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else
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region=$EC2_REGION
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@ -208,16 +203,17 @@ fi
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prerequisite_check
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#sets date variable
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date_current=`date -u +%Y-%m-%d`
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#sets the PurgeAfter tag to the number of days that a snapshot should be retained
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if [[ -n $purge_after_days ]]
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current_date=`date -u +%s`
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#sets the PurgeAfterFE tag to the number of seconds that a snapshot should be retained
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if [[ -n $purge_after_input ]]
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then
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#if the date_binary is not set, call the date_binary_get function
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#if the date_binary is not set, call the get_date_binary function
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if [[ -z $date_binary ]]
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then date_binary_get
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then get_date_binary
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fi
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purge_after_date=`get_purge_after_date`
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echo "Snapshots taken by $app_name will be eligible for purging after the following date: $purge_after_date."
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purge_after_date_fe=`get_purge_after_date_fe`
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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."
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fi
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#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
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@ -226,13 +222,13 @@ get_EBS_List
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#the loop below is called once for each volume in $ebs_backup_list - the currently selected EBS volume is passed in as "ebs_selected"
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for ebs_selected in $ebs_backup_list
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do
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ec2_snapshot_description="ec2ab_${ebs_selected}_$date_current"
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ec2_snapshot_description="ec2ab_${ebs_selected}_$current_date"
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ec2_create_snapshot_result=`ec2-create-snapshot --region $region -d $ec2_snapshot_description $ebs_selected 2>&1`
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if [[ $? != 0 ]]
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then echo -e "An error occured when running ec2-create-snapshot. The error returned is below:\n$ec2_create_snapshot_result" 1>&2 ; exit 70
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else
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ec2_snapshot_resource_id=`echo "$ec2_create_snapshot_result" | cut -f 2`
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fi
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fi
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create_EBS_Snapshot_Tags
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done
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