Infra MCP
infra-mcp
Read-only MCP access to on-prem Linux VMs and PostgreSQL databases over SSH.
agent ──stdio──▶ infra-mcp ──SSH──▶ VMs (journald · log files)
└──▶ DBs (read-only PostgreSQL)
An agent can check service health, retrieve bounded logs, inspect DB state, and explore table schemas — without terminal access. Every remote operation is allowlist-gated and written to an append-only audit log.
Install
uv tool install infra-mcp
# or
pip install infra-mcp
Configure
Copy infra-mcp.yaml.example to ~/.infra-mcp/infra-mcp.yaml and edit it.
# Generate a starter config from ~/.ssh/config
infra-mcp generate-config -o ~/.infra-mcp/infra-mcp.yaml
# Create the read-only PostgreSQL role(s)
infra-mcp setup
# Check VM reachability
infra-mcp test
# Refresh discovered services, log dirs, and databases (updates config in place)
infra-mcp discover --in-place
Override the config path with --config or INFRA_MCP_CONFIG.
Run
infra-mcp run
Register as a stdio MCP server in your client (Claude Code, Cursor, …) with command infra-mcp run.
Tools
VM & services
| Tool | Purpose |
|---|---|
list_vms | All VMs with reachability and watched services |
get_infra_overview | Service states + DB health for one VM in a single call |
get_service_status | systemd state, uptime, last 5 log lines |
get_service_logs | Bounded journald logs, filtered by severity |
get_log_file | Last N lines of an allowed log file, optional grep |
Databases
| Tool | Purpose |
|---|---|
get_db_status | Connection counts, waiting locks, long-running query count |
query_db | Bounded caller-supplied SELECT |
list_tables | Tables in a database (schema + name), capped at 200 |
describe_table | Columns, types, primary key, foreign keys for one table |
Meta
| Tool | Purpose |
|---|---|
get_audit_log | Recent entries from the local audit log |
All output is bounded server-side (200 log lines, 100 DB rows, 200 tables/columns max). Truncation is always flagged with a -- TRUNCATED: marker. list_tables and describe_table cache results in memory (TTL: schema_cache_ttl_hours, default 24 h); pass refresh: true to force a live re-read.
Security model
- SSH commands and systemd services are checked against a per-VM allowlist before any network call.
- All DB queries run as a read-only role inside a
READ ONLYtransaction. - Log file paths are resolved against a per-VM directory allowlist (
..traversal blocked). - Every remote operation is appended to a local JSONL audit log.
Server Config
{
"mcpServers": {
"infra-mcp": {
"command": "infra-mcp",
"args": [
"run"
]
}
}
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