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added systemd example to README #2

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Merged
markmnl merged 4 commits into from
Apr 17, 2026
Merged

added systemd example to README #2

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e4ab51f
added systemd example to README
markmnl Apr 17, 2026
4bc9e30
fix ExecStart
markmnl Apr 17, 2026
d8813b7
PrivateTmp=true
markmnl Apr 17, 2026
ff2e1f2
write permission paths
markmnl Apr 17, 2026
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71 changes: 71 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -85,3 +85,74 @@ All routes are served over HTTPS under the `/fmsgid` path.
| `GET` | `/fmsgid/:address` | Lookup an fmsg address and return its details including display name, quotas, and usage. The address must be in fmsg format (`@user@example.com`). Returns `AddressDetail` JSON on success, `400` if the address is invalid, `404` if not found. |
| `POST` | `/fmsgid/send` | Record a send transaction. Accepts an `AddressTx` JSON body with `address`, `ts` (timestamp), and `size`. |
| `POST` | `/fmsgid/recv` | Record a receive transaction. Accepts an `AddressTx` JSON body with `address`, `ts` (timestamp), and `size`. |

### systemd

An example systemd service to run fmsgid as a service on startup

ASSUMES:
* Directory `/opt/fmsgid` has been created and contains built executable: `fmsgid`
* Text file `/opt/fmsgid/env` exists containing environment variables (example below)
* User `fmsg` has been created and has
- read and execute permissions to `/opt/fmsgid/`, e.g. with `chown -R fmsg:fmsg /opt/fmsgid` after `mkdir /opt/fmsgid`
- write permissions to `/opt/fmsgid` and to the path specified by `FMSGID_CSV_FILE` if it is outside `/opt/fmsgid`

`/etc/systemd/system/fmsgid.service`

```
[Unit]
Description=fmsgid HTTP API
After=network-online.target
Wants=network-online.target

[Service]
Type=simple

User=fmsg
Group=fmsg

EnvironmentFile=/opt/fmsgid/env

ExecStart=/opt/fmsgid/fmsgid
WorkingDirectory=/opt/fmsgid
Comment on lines +114 to +117
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Copilot AI Apr 17, 2026

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ExecStart=/opt/fmsgid/fmsgid 0.0.0.0 suggests the binary accepts a bind-address argument, but src/fmsgid.go doesn't parse CLI args and Gin’s Run(":"+port) already binds on all interfaces by default. Consider removing 0.0.0.0 (or documenting the actual supported way to configure the bind address if one exists).

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Restart=on-failure
RestartSec=3

# --- Filesystem access ---
ReadWritePaths=/opt/fmsgid
PrivateTmp=true

# --- Hardening ---
NoNewPrivileges=true
PrivateTmp=true
ProtectSystem=strict
ProtectHome=true

# --- Logging ---
StandardOutput=journal
StandardError=journal

[Install]
WantedBy=multi-user.target
```

### env

```
GIN_MODE=release
FMSGID_PORT=8080
FMSGID_CSV_FILE=addresses.csv

PGHOST=127.0.0.1
PGPORT=5432
PGUSER=
PGPASSWORD=
PGDATABASE=fmsgid
```

```
sudo systemctl daemon-reload
sudo systemctl enable fmsgid
sudo systemctl start fmsgid
```
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