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Use Docker and Flextesa to Run an Independent Tezos Sandbox​

Running ephemeral and isolated sandboxes can be useful to experiment with faster networks or to automate reproducible tests.

Here we use Flextesa to run one or more Tezos nodes, bakers, and endorsers contained in a sandbox environment. The default sandbox is configured to be compatible with the tezos-client installed in the “Client-setup” section.

Dependencies​

This example requires Docker, available for Linux, Mac, or Windows at https://www.docker.com.

Starting and Using a Sandbox​

Start the sandbox in the background (will run with baking enabled):

docker run --rm --name my-sandbox --detach -p 20000:20000 \
       oxheadalpha/flextesa:20230502 mumbaibox start

After a few seconds, this should succeed:

tezos-client config reset        # Cleans-up left-over configuration.
tezos-client --endpoint http://localhost:20000 bootstrapped

Configure the client to communicate with the sandbox:

tezos-client --endpoint http://localhost:20000 config update

Then, instead of using a public faucet, you can just use tez by importing accounts already existing in the sandbox. They are visible with:

 $ docker run --rm oxheadalpha/flextesa:20230502 mumbaibox info

Usable accounts:

- alice
  * edpkvGfYw3LyB1UcCahKQk4rF2tvbMUk8GFiTuMjL75uGXrpvKXhjn
  * tz1VSUr8wwNhLAzempoch5d6hLRiTh8Cjcjb
  * unencrypted:edsk3QoqBuvdamxouPhin7swCvkQNgq4jP5KZPbwWNnwdZpSpJiEbq
- bob
  * edpkurPsQ8eUApnLUJ9ZPDvu98E8VNj4KtJa1aZr16Cr5ow5VHKnz4
  * tz1aSkwEot3L2kmUvcoxzjMomb9mvBNuzFK6
  * unencrypted:edsk3RFfvaFaxbHx8BMtEW1rKQcPtDML3LXjNqMNLCzC3wLC1bWbAt

Root path (logs, chain data, etc.): /tmp/mini-box (inside container).

You may then just import them:

tezos-client import secret key alice unencrypted:edsk3QoqBuvdamxouPhin7swCvkQNgq4jP5KZPbwWNnwdZpSpJiEbq --force
tezos-client import secret key bob unencrypted:edsk3RFfvaFaxbHx8BMtEW1rKQcPtDML3LXjNqMNLCzC3wLC1bWbAt --force

Check their balances:

tezos-client get balance for alice

Using The Sandbox​

See also the Tezos Client section or the Wallet-usage tutorial of the Tezos manual.

For instance, you can originate the most minimalistic contract:

# Download the contract:
wget https://gitlab.com/tezos/tezos/raw/mainnet/src/bin_client/test/contracts/attic/id.tz
# Run origination:
tezos-client originate contract hello-id transferring 0 from bob running id.tz --init "\"hello world\"" --burn-cap 1 --force

Shutting Down The Sandbox​

When you're done playing, just destroy the container:

docker kill my-sandbox

Advanced Usage​

Tweak Protocol Constants​

One can see the configuration of the protocol running in the sandbox with:

tezos-client rpc get /chains/main/blocks/head/context/constants

One important field is "time_between_blocks": [ "5" ], which means that blocks are baked every 5 seconds (as opposed to 60 seconds on mainnet).

This constant can be configured with the block_time environment variable, see the example below:

docker run --rm --name my-sandbox -e block_time=2 --detach -p 20000:20000 \
       oxheadalpha/flextesa:20230502 mumbaibox start

The above command runs a full sandbox with the Florence protocol and a faster time-between-blocks of 2 seconds.

Many other parameters are set by the mumbaibox script. All the configuration options available can be seen with the command:

docker run --rm -it oxheadalpha/flextesa:20230502 flextesarl mini-net --help

Try The Nairobi Protocol​

The Docker image also contains a nairobibox script:

docker run --rm --name my-sandbox --detach -p 20000:20000 \
       oxheadalpha/flextesa:20230502 nairobibox start

You can then check that the protocol hash is PtNairobiyssHuh87hEhfVBGCVrK3WnS8Z2FT4ymB5tAa4r1nQf:

 $ tezos-client rpc get /chains/main/blocks/head/metadata | grep protocol

{ "protocol": "PtNairobiyssHuh87hEhfVBGCVrK3WnS8Z2FT4ymB5tAa4r1nQf",
  "next_protocol": "PtNairobiyssHuh87hEhfVBGCVrK3WnS8Z2FT4ymB5tAa4r1nQf",

or that there are new constants like the one related to liquidity baking:

 $ tezos-client rpc get /chains/main/blocks/head/context/constants | grep liquidity
  "liquidity_baking_subsidy": "2500000",
  "liquidity_baking_sunset_level": 525600,
  "liquidity_baking_escape_ema_threshold": 1000000 }

Further Reading​

For more issues or questions, see the Flextesa repository, and for even more advanced usage, see the documentation (esp. for the mini-net command).