Creating Splinter Circuits
This procedure summarizes how to create a simple Splinter circuit between
two or more nodes, using the example Grid-on-Splinter environment that is
defined by
grid/examples/splinter/docker-compose.yaml
in the grid
repository.
For more information on circuit creation, see Creating a Circuit in the Splinter documentation.
Prerequisites
-
Two or more working Grid nodes. See Running Grid on Splinter for the procedure to set up and run Grid. The examples in this procedure shows two nodes,
alpha-node-000
andbeta-node-000
, that are running in Docker containers. -
A public/private key pair for the circuit administrator on each node. The keys are used to authorize requests sent to Splinter. This procedure uses the private key files
/registry/alpha.priv
(onalpha-node-000
) and/registry/beta.priv
(onbeta-node-000
). In this example, the key paths are saved by environment variables in the Splinter containers and also saved in theallow_keys
file of the respective Splinter container to authorize the client to make requests. -
The full node ID (hostname and network endpoint) of each node that will belong to the circuit. This procedure shows
alpha-node-000::tcps://splinterd-alpha:8044
andbeta-node-000::tcps://splinterd-beta:8044
.
For more information, see the Splinter documentation: Creating a Circuit. or the splinter-circuit-propose(1) man page.
Important Notes
The examples in this procedure use the node hostnames, container names, node
IDs, and URLs that are defined in the example Grid-on-Splinter docker-compose
file, examples/splinter/docker-compose.yaml
. If you are not using this example
environment, replace these items with the actual values for your nodes.
If not using the example’s key files for Splinter, indicate the full path to
the private key of the user signing the transactions using the --key
option
in Splinter commands. For more information on client authorization in
Splinter, see the Splinter documentation.
Also, this procedure assumes that all nodes are running in docker containers on the same system (as in the example docker-compose file). If the nodes are on separate physical systems, you must share node information and network endpoints with the other administrators. To use the Splinter registry to share node information, see the Splinter documentation.
Procedure
To create a circuit, a user on one node proposes a new circuit that includes one or more other nodes. When users on the other nodes vote to accept the circuit proposal, the circuit is created.
Find the Grid Daemon Key
-
Get the gridd public key from the first node’s
gridd
container (such asgridd-alpha
). You will need this key when proposing the circuit in a later step.$ docker exec gridd-alpha cat /etc/grid/keys/gridd.pub 025011e5207e943aaf2181764bd4d8f921ce6da56ef0060dd06c90bcd44example
Connect to the First Node
-
Connect to the first node’s
splinterd
container (such assplinterd-alpha
). You will use this container to run Splinter commands on the first node (for example,alpha-node-000
).$ docker exec -it splinterd-alpha bash root@splinterd-alpha:/#
-
Copy the
gridd
public key from above and save it in a local file. Make sure to use your actual key value instead of the example value shown below.root@splinterd-alpha:/# echo "025011e5207e943aaf2181764bd4d8f921ce6da56ef0060dd06c90bcd44example" > gridd.pub
Propose a New Circuit
-
Propose a new circuit with the
splinter circuit propose
command.root@splinterd-alpha:/# splinter circuit propose \ --node alpha-node-000::tcps://splinterd-alpha:8044 \ --node beta-node-000::tcps://splinterd-beta:8044 \ --service gsAA::alpha-node-000 \ --service gsBB::beta-node-000 \ --service-type *::scabbard \ --service-arg *::admin_keys=$(cat gridd.pub) \ --service-peer-group gsAA,gsBB \ --auth-type trust \ --management grid
For information on each option, see the splinter-circuit-propose(1) man page.
Note: This command identifies the scabbard service on each node with a service ID (
gsAA
for alpha andgsBB
for beta), plus the node’s host name. Later, you will use this four-character service ID as part of the fully qualified service ID, which is required bygrid
commands for operations on the circuit. -
Check the output to see the results of the transaction. If the proposal transaction succeeded, the output should resemble this example:
The circuit proposal was submitted successfully Circuit: 01234-ABCDE Display Name: - Circuit Status: Active Schema Version: 2 Management Type: grid alpha-node-000 Endpoints: tcps://splinterd-alpha:8044 Service (scabbard): gsAA admin_keys: <gridd-alpha public key> peer_services: gsBB beta-node-000 Endpoints: tcps://splinterd-beta:8044 Service (scabbard): gsBB admin_keys: <gridd-alpha public key> peer_services: gsAA
-
Verify the results by displaying the list of proposals.
root@splinterd-alpha:/# splinter circuit proposals ID NAME MANAGEMENT MEMBERS COMMENTS PROPOSAL_TYPE 01234-ABCDE - grid alpha-node-000;beta-node-000 - Create
-
Set a
CIRCUIT_ID
environment variable based on the output of theproposals
command.root@splinterd-alpha:/# export CIRCUIT_ID=01234-ABCDE
Note: This environment variable is used to simplify the
splinter
commands in this procedure; it is not used directly by thesplinter
CLI. -
Use the circuit ID to display the details of the proposed circuit.
root@splinterd-alpha:/# splinter circuit show $CIRCUIT_ID Proposal to create: 01234-ABCDE Display Name: - Circuit Status: Active Schema Version: 2 Management Type: grid alpha-node-000 Vote: ACCEPT (implied as requester): <alpha-public-key> Endpoints: tcps://splinterd-alpha:8044 Service (scabbard): gsAA admin_keys: <gridd-alpha public key> peer_services: gsBB beta-node-000 Vote: PENDING Endpoints: tcps://splinterd-beta:8044 Service (scabbard): gsBB admin_keys: <gridd-alpha public key> peer_services: gsAA
Connect to the Second Node
A user on the other node (or nodes) must vote to accept or reject the circuit proposal.
-
Connect to the second node’s
splinterd
container (such assplinterd-beta
). You will use this container to run Splinter commands on the second node (for example, onbeta-node-000
).$ docker exec -it splinterd-beta bash root@splinterd-beta:/#
Vote on the Circuit Proposal
-
Find the ID of the proposed circuit. This ID is required for voting on the proposal and for interacting with the circuit once it is approved. For example:
root@splinterd-beta:/# splinter circuit proposals ID NAME MANAGEMENT MEMBERS COMMENTS PROPOSAL_TYPE 01234-ABCDE - grid alpha-node-000;beta-node-000 - Create
-
As on the first node, save the ID in the
CIRCUIT_ID
environment variable, which simplifies enteringsplinter
commands.root@splinterd-beta:/# export CIRCUIT_ID=01234-ABCDE
-
Use the circuit ID to show the details of the proposed circuit.
root@splinterd-alpha:/# splinter circuit show $CIRCUIT_ID Proposal to create: 01234-ABCDE Display Name: - Circuit Status: Active Schema Version: 2 Management Type: grid alpha-node-000 Vote: ACCEPT (implied as requester): <alpha-public-key> Endpoints: tcps://splinterd-alpha:8044 Service (scabbard): gsAA admin_keys: <gridd-alpha public key> peer_services: gsBB beta-node-000 Vote: PENDING Endpoints: tcps://splinterd-beta:8044 Service (scabbard): gsBB admin_keys: <gridd-alpha public key> peer_services: gsAA
-
Vote to accept the proposal.
root@splinterd-beta:/# splinter circuit vote \ $CIRCUIT_ID \ --accept
Display the Circuit List and Circuit Details
-
Display all approved circuits to verify that the new circuit has been created. For example:
root@splinterd-beta:/# splinter circuit list ID NAME MANAGEMENT MEMBERS 01234-ABCDE - grid alpha-node-000;beta-node-000
-
Check the circuit status on the first node. The circuit information should be the same on both nodes.
root@splinterd-alpha:/# splinter circuit list ID NAME MANAGEMENT MEMBERS 01234-ABCDE - grid alpha-node-000;beta-node-000
-
You can display the circuit’s details with the
splinter circuit show
command. This example uses theCIRCUIT_ID
variable that was set in an earlier step.root@splinterd-alpha:/# splinter circuit show $CIRCUIT_ID Circuit: 01234-ABCDEg Display Name: - Circuit Status: Active Schema Version: 2 Management Type: grid alpha-node-000 Endpoints: tcps://splinterd-alpha:8044 Service (scabbard): gsAA admin_keys: <gridd-alpha public key> peer_services: gsBB beta-node-000 Endpoints: tcps://splinterd-beta:8044 Service (scabbard): gsBB admin_keys: <gridd-alpha public key> peer_services: gsAA
Now that the circuit has been accepted, note that the output starts with
Circuit:
instead of theProposal to create:
label that marks a proposed circuit (as shown in a previous step).
Determine the Service ID
Most Grid commands require the fully qualified service ID for the scabbard
service on the circuit. This ID has the form
circuitID::serviceString
(for example,
01234-ABCDE::gsAA
). You can run splinter circuit show
to see the elements
for the service ID, as shown in the previous step.
Tip: The grid
CLI accepts the GRID_SERVICE_ID
environment variable in place
of the --service-id
option on the command line. For example, you can use the
following command to set this variable on alpha-node-000
:
root@gridd-alpha:/# export GRID_SERVICE_ID=01234-ABCDE::gsAA
For more information on grid
commands, see the
CLI command reference.
Next Steps
Now that you have a working circuit between member nodes, you can create items such as Pike organizations, product schemas, and Grid products. For more information, see Using Grid Features.