add example scripts for manually copying docker volumes

docs/cluster_guide.md

@@ -196,3 +196,6 @@ services:
 ```
   - Start the hub services by running `docker-compose up -d`
   - Check the status with `docker-compose logs -f --tail 100`
+
+### Manual setup of docker volumes from snapshots
+  For an example of copying and configuring permissions for a hub docker volume, see [this](https://github.com/lbryio/hub/blob/master/scripts/initialize_rocksdb_snapshot_dev.sh). For an example for the elasticsearch volume, see [this](https://github.com/lbryio/hub/blob/master/scripts/initialize_es_snapshot_dev.sh). **Read these scripts before running them** to avoid overwriting the wrong volume, they are more of a guide on how to set the permissions and where files go than setup scripts.

scripts/initialize_es_snapshot_dev.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+ES_NAME="es01"
+SNAPSHOT_HEIGHT="1188203"
+SNAPSHOT_NODES="snapshot_es_${SNAPSHOT_HEIGHT}/snapshot/nodes"
+ES_VOLUME_PATH="/var/lib/docker/volumes/${USER}_${ES_NAME}"
+
+sudo rm -rf "${ES_VOLUME_PATH}/_data"
+sudo mkdir -p "${ES_VOLUME_PATH}/_data"
+sudo cp -r "${SNAPSHOT_NODES}" "${ES_VOLUME_PATH}/_data/"
+
+sudo chown -R $USER:root "${ES_VOLUME_PATH}/_data"
+sudo chmod -R 775 "${ES_VOLUME_PATH}/_data"

scripts/initialize_rocksdb_snapshot_dev.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+SNAPSHOT_HEIGHT="1188203"
+HUB_VOLUME_PATH="/var/lib/docker/volumes/${USER}_lbry_rocksdb"
+
+sudo rm -rf "${HUB_VOLUME_PATH}/_data"
+sudo mkdir -p "${HUB_VOLUME_PATH}/_data"
+sudo cp -r "snapshot_${SNAPSHOT_HEIGHT}/lbry-rocksdb" "${HUB_VOLUME_PATH}/_data/"
+sudo touch "${HUB_VOLUME_PATH}/_data/scribe.log"
+sudo touch "${HUB_VOLUME_PATH}/_data/scribe-elastic-sync.log"
+sudo touch "${HUB_VOLUME_PATH}/_data/herald.log"
+sudo cp "snapshot_${SNAPSHOT_HEIGHT}/es_info" "${HUB_VOLUME_PATH}/_data/"
+sudo chown -R 999:999 "${HUB_VOLUME_PATH}/_data"