Merge pull request #25 from davestern/copy-volume-regional
Copy Snapshots to different regions
This commit is contained in:
Colin Johnson
commit
9ba549ad00
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@ -24,10 +24,12 @@ ec2-automate-backup requires one of the following two parameters be provided:
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`-v <volumeid>` - the "volumeid" parameter is required to select EBS volumes for snapshot if ec2-automate-backup is run using the "volumeid" selection method - the "volumeid" selection method is the default selection method.
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`-t <tag>` - the "tag" parameter is required if the "method" of selecting EBS volumes for snapshot is by tag (-s tag). The format for tag is key=value (example: Backup=true) and the correct method for running ec2-automate-backup in this manner is ec2-automate-backup -s tag -t Backup=true.
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`-d <destination region(s)>` - the "destination region" parameter is required if the "method" of selecting EBS snapshots for copy to another region is by region (-s regioncopy). The format for `-d` is space-delimited region names such as ec2-automate-backup.sh -s regioncopy -d "us-west-1 us-west-2". This selection method only operates on snapshots.
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## Optional Parameters:
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`-r <region>` - the region that contains the EBS volumes for which you wish to have a snapshot created.
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`-s <selection_method>` - the selection method by which EBS volumes will be selected. Currently supported selection methods are "volumeid" and "tag." The selection method "volumeid" identifies EBS volumes for which a snapshot should be taken by volume id whereas the selection method "tag" identifies EBS volumes for which a snapshot should be taken by a key=value format tag.
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`-s <selection_method>` - the selection method by which EBS volumes will be selected. Currently supported selection methods are "volumeid", "tag" and "regioncopy." The selection method "volumeid" identifies EBS volumes for which a snapshot should be taken by volume id whereas the selection method "tag" identifies EBS volumes for which a snapshot should be taken by a key=value format tag. The selection method "regioncopy" identifies regions as destinations for EBS volumes that have been scheduled for copy to that region.
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`-c <cron_primer_file>` - running with the -c option and a providing a file will cause ec2-automate-backup to source a file for environmental configuration - ideal for running ec2-automate-backup under cron. An example cron primer file is located in the "Resources" directory and is called cron-primer.sh.
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@ -36,14 +38,18 @@ ec2-automate-backup requires one of the following two parameters be provided:
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`-k <purge_after_period>` - the period after which a snapshot can be purged. For example, running "ec2-automate-backup.sh -v "vol-6d6a0527 vol-636a0112" -k 31" would allow snapshots to be removed after 31 days. purge_after_period creates two tags for each volume that was backed up - a PurgeAllow tag which is set to PurgeAllow=true and a PurgeAfterFE tag which is set to the number of minutes from epoch after which a snapshot can be purged. Values can also be entered as -k 60m (this would purge snapshots after 60 minutes or -k 2h (this would purge snapshots after 2 hours) or -k 7d (this would purge snapshots after 7 days). With no trailing characters the purge after period defaults to days.
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`-p` - the -p flag will purge (meaning delete) all snapshots that where the current date is passed the volumes "PurgeAfterFE" tag. ec2-automate-backup looks at two tags to determine which snapshots should be deleted - the PurgeAllow and PurgeAfterFE tags. The tags must be set as follows: PurgeAllow=true and PurgeAfterFE=xxxxxxxxxx where xxxxxxxxxx is a UNIX time that is before the current date.
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`-g <scheduled destination regions>` - Space-delimited destination regions for the volumes selected. This is added when the `-v` or `-t` selection method is used. Note that this only adds a tag that schedules the snapshot to be copied to the destinations. On subsequent calls, the `-d` parameter will intiate copies to the specified regions.
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# Potential Uses and Methods of Use:
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* To backup multiple EBS volumes use ec2-automate-backup as follows: `ec2-automate-backup -v "vol-6d6a0527 vol-636a0112"`
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* To backup multiple EBS volumes and schedule them for copy to two other regions: `ec2-automate-backup -v "vol-6d6a0527 vol-636a0112" -g "us-west-1 us-west-2"`
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* To backup a selected group of EBS volumes on a daily schedule tag each volume you wish to backup with the tag "Backup=true" and run ec2-automate-backup using cron as follows: `0 0 * * 0 ec2-automate-backup -s tag -t "Backup=true"`
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* To backup a selected group of EBS volumes on a daily and/or monthly schedule tag each volume you wish to backup with the tag "Backup-Daily=true" and/or "Backup-Monthly=true" and run ec2-automate-backup using cron as follows:
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- `0 0 * * 0 ec2-user /home/ec2-user/ec2-automate-backup.sh -s tag -t "Backup-Daily=true"`
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- `0 0 1 * * ec2-user /home/ec2-user/ec2-automate-backup.sh -s tag -t "Backup-Monthly=true"`
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* To perform daily backup using cron and to load environment configuration with a "cron-primer" file:
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- `0 0 * * 0 ec2-user /home/ec2-user/ec2-automate-backup.sh -c /home/ec2-user/cron-primer.sh -s tag -t "Backup=True"`
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* To initiate the copy of scheduled snapshots to their destination regions: `ec2-automate-backup.sh -s regioncopy -d "us-west-1 us-west-2"`
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`-u` - the -u flag will tag snapshots with additional data so that snapshots can be more easily located. Currently the two user tags created are Volume="ebs_volume" and Created="date." These can be easily modified in code.
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@ -7,7 +7,14 @@
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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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for prerequisite in basename ec2-create-snapshot ec2-create-tags ec2-describe-snapshots ec2-delete-snapshot date
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check_values=$1
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if [[ -z $check_values ]]
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then
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check_values='ec2-create-snapshot ec2-create-tags ec2-describe-snapshots ec2-delete-snapshot date'
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fi
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for prerequisite in basename $check_values
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do
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#use of "hash" chosen as it is a shell builtin and will add programs to hash table, possibly speeding execution. Use of type also considered - open to suggestions.
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hash $prerequisite &> /dev/null
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@ -33,21 +40,32 @@ get_EBS_List()
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fi
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ebs_selection_string="--filter tag:$tag"
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;;
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regioncopy)
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if [[ -z $region_copy_destinations ]]
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then echo "The selected selection_method \"regioncopy\" (-s regioncopy) requires valid region names (-d '[region name(s)]') or 'all' for operation. Correct usage is as follows: \"-s regioncopy -d 'us-west-1'\" or \"-s regioncopy -d 'us-west-1 us-west-2'.\"" 1>&2 ; exit 64
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fi
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;;
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*) echo "If you specify a selection_method (-s selection_method) for selecting EBS volumes you must select either \"volumeid\" (-s volumeid) or \"tag\" (-s tag)." 1>&2 ; exit 64 ;;
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esac
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#creates a list of all ebs volumes that match the selection string from above
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ebs_backup_list_complete=`ec2-describe-volumes --show-empty-fields --region $region $ebs_selection_string 2>&1`
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#takes the output of the previous command
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ebs_backup_list_result=`echo $?`
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if [[ $ebs_backup_list_result -gt 0 ]]
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then echo -e "An error occured when running ec2-describe-volumes. The error returned is below:\n$ebs_backup_list_complete" 1>&2 ; exit 70
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if [[ -n $ebs_selection_string ]]
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then
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#creates a list of all ebs volumes that match the selection string from above
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ebs_backup_list_complete=`ec2-describe-volumes --show-empty-fields --region $region $ebs_selection_string 2>&1`
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#takes the output of the previous command
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ebs_backup_list_result=`echo $?`
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if [[ $ebs_backup_list_result -gt 0 ]]
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then echo -e "An error occured when running ec2-describe-volumes. The error returned is below:\n$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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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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echo "create_EBS_Snapshot_Tags region_copy_scheduled_destinations=$region_copy_scheduled_destinations"
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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}_$current_date to the variable $snapshot_tags
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@ -68,6 +86,15 @@ create_EBS_Snapshot_Tags()
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snapshot_tags="$snapshot_tags --tag Volume=${ebs_selected} --tag Created=$current_date"
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fi
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#if $name_tag_create is true then append RegionCopy=[region]:scheduled,[region]:scheduled to the variable $snapshot_tags
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if [[ -n $region_copy_scheduled_destinations ]]
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then
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ec2_snapshot_resource_id=`echo "$ec2_create_snapshot_result" | cut -f 2`
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regions=$(echo $region_copy_scheduled_destinations | sed 's/ */:scheduled,/g')
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snapshot_tags="$snapshot_tags --tag RegionCopy=${regions}:scheduled"
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echo "tagging $ec2_snapshot_resource_id with $snapshot_tags"
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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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if [[ -n $snapshot_tags ]]
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then echo "Tagging Snapshot $ec2_snapshot_resource_id with the following Tags:"
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@ -133,6 +160,50 @@ purge_EBS_Snapshots()
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done
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}
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region_copy_EBS_Snapshots()
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{
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#snapshots_to_region_copy is a list of all snapshot_ids with RegionCopy=.*:scheduled.*
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# tr and $'n' substitution used so $IFS doesn't have to be
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# manipulated with for loops and the cut command
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snapshot_tag_list=$(ec2-describe-tags --show-empty-fields --region $region --filter resource-type=snapshot --filter key=RegionCopy | grep ':scheduled' | cut -f3,5- | tr '[\t ]' '~')
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for snapshot_data in $(echo ${snapshot_tag_list//$'\n'/ } | cut -f1-)
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do
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snapshot_id=$(echo $snapshot_data | cut -d'~' -f1)
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regions=$(echo $snapshot_data | cut -d'~' -f2-)
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original_regions=$regions
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region_copy_tag=''
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for region_data in ${regions//,/ }
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do
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destination_region=$(echo $region_data | cut -d: -f1)
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status=$(echo $region_data | cut -d: -f2-)
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region_copy_tag_append="$destination_region:$status"
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if [[ "$region_copy_destinations" = "all" || -n $(echo "$region_copy_destinations"| grep $destination_region) ]]
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then
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current_datetime=$(date +%Y-%m-%d_%H:%M:%S)
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if [ "$status" = "scheduled" ]
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then
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ec2_copy_snapshot_complete=$(ec2-copy-snapshot -r $region -s $snapshot_id --region $destination_region)
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ec2_copy_snapshot_result=`echo $?`
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if [[ $ec2_copy_snapshot_result -gt 0 ]]
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then
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echo -e "An error occured when running ec2-copy-snapshot. The error returned is below:\n$ec2_copy_snapshot_complete" 1>&2 ; exit 70
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else
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region_copy_tag_append="$destination_region:$current_datetime"
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echo "The snapshot \"$snapshot_id\" is being copied to $destination_region."
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fi
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fi
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fi
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region_copy_tag="${region_copy_tag},$region_copy_tag_append"
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done
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if [[ "${region_copy_tag#,}" != "$original_regions" ]]
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then
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ec2-create-tags $snapshot_id --region $region --tag RegionCopy=${region_copy_tag#,}
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fi
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done
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}
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app_name=`basename $0`
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#sets defaults
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@ -148,7 +219,7 @@ 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 "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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while getopts :s:c:r:v:t:k:pnu opt
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while getopts :s:c:r:v:t:k:g:d:l:pnu opt
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do
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case $opt in
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s) selection_method="$OPTARG";;
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@ -157,6 +228,8 @@ while getopts :s:c:r:v:t:k:pnu opt
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v) volumeid="$OPTARG";;
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t) tag="$OPTARG";;
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k) purge_after_input="$OPTARG";;
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g) region_copy_scheduled_destinations="$OPTARG";;
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d) region_copy_destinations="$OPTARG";;
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n) name_tag_create=true;;
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p) purge_snapshots=true;;
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u) user_tags=true;;
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@ -222,3 +295,11 @@ if $purge_snapshots
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then echo "Snapshot Purging is Starting Now."
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purge_EBS_Snapshots
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fi
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#if region_copy_destinations is true, then run region_copy_EBS_Snapshots function
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if [[ -n $region_copy_destinations ]]
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then echo "Snapshot Copying to regions $region_copy_destinations is Starting Now."
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prerequisite_check ec2-copy-snapshot
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region_copy_EBS_Snapshots
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fi
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