asvignesh · March 8, 2020 14:51 · Mar 8, 2020
diff --git a/IAM Role.json b/IAM Role.json
@@ -0,0 +1,17 @@
+{
+    "Version": "2012-10-17",
+    "Statement": [
+        {
+            "Sid": "1",
+            "Effect": "Allow",
+            "Action": [
+                "ec2:CreateSnapshot",
+                "ec2:CreateTags",
+                "ec2:DescribeInstanceAttribute"
+            ],
+            "Resource": [
+                "*"
+            ]
+        }
+    ]
+}
diff --git a/ec2-consistentbackup.sh b/ec2-consistentbackup.sh
@@ -0,0 +1,96 @@
+#!/bin/bash
+
+# ec2-consistentbackup --description='My First backup' --tags="user=asvignesh;"
+# This script freezes all EXT4 and XFS Filesystem running on Linux EC2 Instances
+
+description=""
+tags=""
+
+for i in "$@"
+do
+case $i in
+    --description=*) description="${i#*=}" ;;
+    --tags=*) tags="${i#*=}" ;;
+    *) ;;
+esac
+done
+
+if [[ -z $tags ]]; then
+  tags_spec=""
+else
+  # Input format is name=value;name2=value2
+  # Output format is {Key=name,Value=value},{Key=name2,Value=value2}
+  new_tags=$( echo $tags | perl -p -e 's/(.*?)=(.*?)(;|$)/{Key=\1,Value=\2},/g; s/,$//' )
+  tags_spec="ResourceType=snapshot,Tags=[$new_tags]"
+fi
+
+
+# Unfreeze file systems
+function unfreeze() {
+  for target in $(findmnt -nlo TARGET -t ext4,xfs); {
+    if [[ "$target" != "/"  ]]; then
+      fsfreeze --unfreeze "$target";
+    fi
+  }
+}
+
+function warn_and_unfreeze() {
+  # If there was any problem, make sure to unfreeze the filesystems before quitting!
+  errorCode=$?
+  if [ $errorCode -ne 0 ]; then
+    unfreeze
+    echo -e "ec2-consistent-snapshot exited with an error: $snapshot_output\n$vol_output"
+    exit $errorCode
+  fi
+}
+
+# Make sure to unfreeze if we are done, but but also if there was an error or if we are interrupted
+trap warn_and_unfreeze SIGINT ERR
+
+# Sync data to disk
+sync
+
+{
+  # Find the volumes for the instance
+  instance=$(curl -s http://169.254.169.254/latest/meta-data/instance-id)
+  # Get the Availability Zone, like "us-east-1b"
+  az=$(curl -s http://169.254.169.254/latest/meta-data/placement/availability-zone)
+  # Trim off the last character of the AZ, so "us-east-1b" becomes "us-east-1"
+  region=${az::-1}
+
+  volumes=$(
+    aws ec2 describe-instance-attribute --instance-id $instance \
+                                        --attribute blockDeviceMapping \
+                                        --output text \
+                                        --query BlockDeviceMappings[*].Ebs.VolumeId \
+                                        --region $region
+  )
+
+
+  # Find the mounted EXT4 and XFS partitions and freeze them
+  # To avoid hanging the machine in unrecoverable way, don't freeze "/".
+  for target in $(findmnt -nlo TARGET -t ext4,xfs); {
+    if [[ "$target" != "/"  ]]; then
+      fsfreeze --freeze "$target";
+    fi
+  }
+
+  snapshot_output=""
+
+  # Create snapshots for the current instance
+  # Be sure you have an Role attached to the instance
+  #  and that the role has permission to make snapshots.
+  for volume in $(echo $volumes | tr " " "\n"); {
+    vol_output=$(
+      aws ec2 create-snapshot --volume-id $volume \
+                              --description "$description" \
+                              --region $region \
+                              --tag-specifications "$tags_spec" 2>&1
+    )
+    snapshot_output="$snapshot_output\n$vol_output";
+  }
+
+  unfreeze
+}
+
+exit 0;