How to save Parity data with docker

Question

Every time I upgrade parity on docker by pulling and creating a new container I lose all sync data.

The Dockerfile doesn't seem to expose a volume I could mount with -v

Is there a trick to it or should I ignore it now that Parity can auto-update (since 1.5)?

Answer 1

The solution is to mount it on docker with -v to a local folder

Example

First on your host create the folder where parity is going to save the data

mkdir /srv/parity

Then make sure you have the latest version of parity

docker pull parity/parity:nightly

And finally create the container with the following parameters:

• -v /srv/parity:/root/.local/share/io.parity.ethereum/ (mount your local folder /srv/parity to the containers parity storage

Full run command:

docker run -ti -d -p 8545:8545 --name parity -v /srv/parity:/root/.local/share/io.parity.ethereum/ parity/parity:nightly --jsonrpc-interface '0.0.0.0' --jsonrpc-hosts="all" --author "0xYOURETHADDRESS" --auto-update="all" -d /mnt

Note: This command will also:

• Allow the JSON RPC interface to be accessed by anyone in your network so don't use this command on an exposed server
• Enable the auto-update of Parity which was introduced in 1.5
• Allows you to solo-mine by specifying the "author" parameter

After you ran the command you can verify that everything worked by checking the /srv/parity folder on your docker host

---

Bonus dev script:

You can use the following bash script to update parity whenever you like. It removes the old container, creates a new but keeps the data

#!/bin/sh

docker pull parity/parity:nightly
docker rm -f parity
docker run --restart always -ti -d \
-p 8180:8180 -p 8545:8545 -p 8546:8546 -p 30303:30303 -p 30303:30303/udp \
--name parity --restart always \
-v /srv/parity:/root/.local/share/io.parity.ethereum/ parity/parity:nightly \
--jsonrpc-interface '0.0.0.0' --jsonrpc-hosts="all" \
--author 0xYOURETHADDRESSHERE \
--auto-update="all" \
--stratum --stratum-interface=0.0.0.0 \
--jsonrpc-cors null \
--unsafe-expose \
--db-compaction hdd \
--mode active --cache-size 4096 \
--ui-interface 0.0.0.0 --ui-no-validation

docker logs --follow parity