nixcfg/doc/telemetry.md

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# generate ca and tls certs for elasticsearch cluster
start a `bash` in an elasticsearch image, such as `docker.elastic.co/elasticsearch/elasticsearch:8.2.0`: `docker run -ti docker.elastic.co/elasticsearch/elasticsearch:8.2.0 bash`
generate a ca and node certs:
```bash
./bin/elasticsearch-certutil ca
./bin/elasticsearch-certutil cert --ca elastic-stack-ca.p12
```
write these files in Consul at `secrets/telemetry/elasticsearch/elastic-certificates.p12` and `secrets/telemetry/elasticsearch/elastic-stack-ca.p12`
# start nomad services
```bash
nomad run telemetry-system.hcl
nomad run telemetry.hcl
```
# create elasticsearch passwords
in an elasticsearch container that was launched by Nomad:
```bash
./bin/elasticsearch-reset-password -u elastic
./bin/elasticsearch-reset-password -u kibana
```
save passwords in consul, at:
- `secrets/telemetry/elastic_passwords/kibana_system` for user `kibana_system`
- `secrets/telemetry/elastic_passwords/elastic` for user `elastic`
check kibana works, login to kibana with user `elastic`
grafana and apm-server will use the elastic user (the admin) to write data to elasticsearch