From 9fc2541b3c325fb78e006df0f17f6c3ad969822e Mon Sep 17 00:00:00 2001
From: Frieder Schlesier <frieder@fschl.de>
Date: Fri, 8 Jun 2018 19:57:21 +0200
Subject: [PATCH] first draft of docker volume management script

---
 bin/dvbackup       | 26 ++++++++++++++++++++++++++
 bin/dvrestore      | 20 ++++++++++++++++++++
 bin/move-dockervol |  3 +++
 3 files changed, 49 insertions(+)
 create mode 100644 bin/dvbackup
 create mode 100644 bin/dvrestore
 create mode 100644 bin/move-dockervol

diff --git a/bin/dvbackup b/bin/dvbackup
new file mode 100644
index 0000000..f47e1a1
--- /dev/null
+++ b/bin/dvbackup
@@ -0,0 +1,26 @@
+#!/bin/bash
+
+# https://stackoverflow.com/questions/26331651/how-can-i-backup-a-docker-container-with-its-data-volumes/26339869#26339869
+# This script allows you to backup a single volume from a container
+# Data in given volume is saved in the current directory in a tar archive.
+CONTAINER_NAME=$1
+VOLUME_NAME=$2
+
+usage() {
+  echo "Usage: $0 [container name] [volume name]"
+  exit 1
+}
+
+if [ -z $CONTAINER_NAME ]
+then
+  echo "Error: missing container name parameter."
+  usage
+fi
+
+if [ -z $VOLUME_NAME ]
+then
+  echo "Error: missing volume name parameter."
+  usage
+fi
+
+sudo docker run -rm --volumes-from $CONTAINER_NAME -v $(pwd):/backup busybox tar cvf /backup/$CONTAINER_NAME_$VOLUME_NAME.tar $VOLUME_NAME
diff --git a/bin/dvrestore b/bin/dvrestore
new file mode 100644
index 0000000..6940fc5
--- /dev/null
+++ b/bin/dvrestore
@@ -0,0 +1,20 @@
+#!/bin/bash
+
+# https://stackoverflow.com/questions/26331651/how-can-i-backup-a-docker-container-with-its-data-volumes/26339869#26339869
+# This script allows you to restore a single volume from a container
+# Data in restored in volume with same backupped path
+CONTAINER_NAME=$1
+VOLUME_NAME=$2
+
+usage() {
+  echo "Usage: $0 [container name]"
+  exit 1
+}
+
+if [ -z $NEW_CONTAINER_NAME ]
+then
+  echo "Error: missing container name parameter."
+  usage
+fi
+
+sudo docker run -rm --volumes-from $CONTAINER_NAME -v $(pwd):/backup busybox tar xvf /backup/$CONTAINER_NAME_$VOLUME_NAME.tar
diff --git a/bin/move-dockervol b/bin/move-dockervol
new file mode 100644
index 0000000..df075d4
--- /dev/null
+++ b/bin/move-dockervol
@@ -0,0 +1,3 @@
+docker run --rm \
+-v <SOURCE_DATA_VOLUME_NAME>:/from \
+alpine ash -c "cd /from ; tar -cf - . " | ssh <TARGET_HOST> 'docker run --rm -i -v <TARGET_DATA_VOLUME_NAME>:/to alpine ash -c "cd /to ; tar -xpvf - " '