NATS Server On Loopback, JetStream On, Round-Tripped
NATS server from the upstream release (sha256-verified) as a hardened system service on loopback with JetStream under its own data directory and the configuration checked by nats-server -t before it lands. No client is installed, so the live test speaks the protocol itself: one session subscribes, publishes and reads its own message back. Original role, live-tested on Rocky Linux 10.
Verification
Live-testedReally deployed to a container sandbox, proven idempotent (a second run changes nothing), verified against the role’s assertions, then torn down.
Conformance
- Static validation (yamllint · ansible-lint)
Provenance
- SHA-256 checksum
- Signature (pending)
Functional
- Live-tested - applied, verified, destroyed
Last verified 2026-09-20 · podman 4.9.3 · ansible 2.21.4 · how we verify
Cite it in your README
badge · attributionPaste this beside the module in the repository that uses it. The badge is rendered from this artifact's verification record, so it reads live-tested because the record says so, and the link lands on this page.
[](https://www.iac-bazaar.com/catalog/ansible-nats-server?utm_source=syndication&utm_medium=readme&utm_campaign=artifact)
Ansible role 1.0.0, live-tested on IaC Bazaar: [NATS Server On Loopback, JetStream On, Round-Tripped](https://www.iac-bazaar.com/catalog/ansible-nats-server?utm_source=syndication&utm_medium=readme&utm_campaign=artifact)
```yaml
# NATS Server On Loopback, JetStream On, Round-Tripped: https://www.iac-bazaar.com/catalog/ansible-nats-server (download from your IaC Bazaar account)
```Preview:
Documentation
nats-server
NATS server from the upstream release tarball (sha256-verified), as a
hardened system service on loopback with JetStream persistence under its own
data directory and the configuration checked by nats-server -t before it
lands. Original role for EL 10, live-tested with podman on Rocky Linux 10.
No package, so the checksum is the whole story. EL 10 carries no
nats-server; NATS ships a release with a checksum file beside it. The
role downloads both and has Ansible's get_url refuse the asset unless its
SHA-256 is the one in the vendor's file, then installs the binaries as
root's in /usr/local/bin, pinned by nats_server_version.
A service account, a hardened unit, a loopback listener. nats-server
is a system user with no shell that owns the data directory and nothing
else; the unit runs with NoNewPrivileges, PrivateTmp, ProtectHome and
ProtectSystem=strict. The listener is 127.0.0.1:4222 by default,
for a proxy that authenticates or a client on the same host; the live test
reads the listening sockets and expects loopback only.
A message, round-tripped without a client. No NATS client is
installed by the role, so the live test speaks the protocol over
/dev/tcp: one session subscribes to a subject, publishes to it, and must
read its own MSG back. That is the broker doing its work, not a port
answering. The monitoring endpoint on 8222 is loopback too; the live test
reads the version from /varz and the JetStream store from /jsz.
No accounts by default. A single-host broker on loopback has one
implicit account and no authentication; accounts, users, TLS and
clustering go in nats_server_extra_config, appended verbatim in
nats-server's own syntax and checked by the same -t before the file
lands. The cluster port (6222) is not opened.
License
Commercial - IaC Bazaar EULA. (c) IaC Bazaar.
Usage code & full reference need an account
The complete copy-paste usage, the full input/output reference, and operational notes are free with an account - shown here and bundled in the download. Sign in and this section fills in.
- Variables
- Test
Related modules
ansible-kafka
Apache Kafka 4 (SHA-512 pinned) on Java 21, one KRaft node on EL 10 from the upstream release, as a hardened systemd service on loopback; the live test creates a topic, produces one message, consumes it back and reads the metadata quorum; the metadata log is formatted once as the service user and the root-owned release tree is run in place. Original role, live-tested on Rocky Linux 10.
ansible-dovecot
Dovecot from AppStream: IMAP for your mail clients and LMTP for your MTA, Maildir in each home, TLS required before any login, a minimum TLS version checked before it lands, and every listener on loopback until you open it. The live test delivers over LMTP, reads the message over IMAPS, and sees a plaintext login from another address refused. Original role, live-tested on Rocky Linux 10.
ansible-gotify
Gotify on EL 10 from the vendor's release, pinned by a SHA-256 the role carries (the vendor publishes no checksum file), as a hardened systemd service on loopback with its settings in an EnvironmentFile; the live test creates an application, pushes a message with its token, reads it back as the admin, and sees a wrong password and a bad token refused. Original role, live-tested on Rocky Linux 10.
ansible-postfix-tls
An EL host opens no submission service, so every client sends on port 25 where plaintext is accepted. This role adds 587, which refuses mail until the session is encrypted, and 465, which is TLS from the first byte. Port 25 keeps taking plaintext on purpose and the live test asserts it, because a mail exchanger that demands STARTTLS loses mail. Original role, live-tested on Rocky Linux 10.
ansible-mosquitto-broker
Mosquitto (MQTT) with accounts: the package starts in local-only mode with anonymous clients allowed, no persistence directory and no packet-size limit. This role writes a listener that refuses anonymous and wrong-password clients (proved live), keeps retained messages across restarts, caps packets at 1 MiB, and renders topic ACLs from a list. Original role, live-tested on Rocky Linux 10.
ansible-nats
nats on EL 10 from the GitHub release; get_url refuses it unless its SHA-256 is in the vendor's checksums file, and the live test re-checks it, then saves a context under a throwaway config home, reads it back, and runs server check connection against a dead port expecting exit 2 and CRITICAL. Pinned. Original role, live-tested on Rocky Linux 10.