add instructions to run the hammer

Author: phbnf

deployment/live/gcp/test/README.md

@@ -2,7 +2,7 @@
 
 ## Prerequisites
 You'll need to have a VM running in the same GCP project that you can SSH to,
-with Go installed.
+with Go installed, and you favourite terminal multiplexer.
 
 ## Overview
 
@@ -35,8 +35,25 @@ Terraforming the project can be done by:
  2. Run `terragrunt apply`
 
 ## Run the SCTFE
+### With fake chains
 
-On the VM, run the following command:
+On the VM, run the following command to bring up the SCTFE:
 ```bash
 go run ./cmd/gcp/ --project_id=${GOOGLE_PROJECT} --bucket=${GOOGLE_PROJECT}-${TESSERA_BASE_NAME}-bucket --spanner_db_path=projects/${GOOGLE_PROJECT}/instances/${TESSERA_BASE_NAME}/databases/${TESSERA_BASE_NAME}-db --spanner_db_path=projects/${GOOGLE_PROJECT}/instances/${TESSERA_BASE_NAME}/databases/${TESSERA_BASE_NAME}-dedup-db --private_key=./testdata/ct-http-server.privkey.pem  --password=dirk --roots_pem_file=./testdata/fake-ca.cert --origin=${TESSERA_BASE_NAME}
 ```
+
+In a different terminal you can either mint and submit certificates manually, or use the hammer tool to do this.
+
+#### Automatically generate chains
+Save the SCTFE repo's path:
+
+```bash
+export SCTFE_REPO=$(pwd)
+```
+
+Clone the [certificate-transparenct-go](https://github.com/google/certificate-transparency-go) repo, and from there run:
+
+```bash
+go run ./trillian/integration/ct_hammer/ --ct_http_servers=localhost:6962/${TESSERA_BASE_NAME} --max_retry=2m --invalid_chance=0 --get_sth=0 --get_sth_consistency=0 --get_proof_by_hash=0 --get_entries=0 --get_roots=0 --get_entry_and_proof=0 --max_parallel_chains=4 --skip_https_verify=true --operations=10000 --rate_limit=150 --log_config=${SCTFE_REPO}/testdata/hammer.cfg --testdata_dir=./trillian/testdata/
+```
+