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Pass MINIO_MCP_INTERNAL_BUCKET_EXPIRE_DAYS to the MinIO MCP 

Execution buckets expire after 7 days by default; 0 keeps the files for ever.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
This commit is contained in:
Lucio Lelii 2026-10-02 17:42:30 +02:00
parent 2e89c7e0b7
commit 6a501e91c0
3 changed files with 6 additions and 0 deletions
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2
ENVIRONMENT.md
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@ -49,6 +49,7 @@ Generate a token with `openssl rand -hex 32`.
| Variable | Default | Meaning |
|---|---|---|
| `MINIO_MCP_INTERNAL_BUCKET_PREFIX` | `exec-` | Every internal-mode bucket is `<prefix><execution id>`. Cannot be empty; at most 27 lowercase letters, digits or `-`. It is the boundary that keeps the API key inside buckets this server made. |
| `MINIO_MCP_INTERNAL_BUCKET_EXPIRE_DAYS` | `7` | Lifecycle rule set on an execution's bucket when this server creates it: objects are deleted that many days after they were written. `0` sets none. The empty bucket stays. Needs permission to set a bucket lifecycle; if refused, the session still opens and a warning is logged. |
| `MINIO_MCP_ALLOWED_ENDPOINTS` | empty (any) | Comma-separated S3 origins, e.g. `https://s3.example.org`. **Set it on an exposed server.** It applies to both modes, so the internal MinIO's endpoint must be on it. |
| `MINIO_MCP_DEFAULT_REGION` | `us-east-1` | Region when a session names none. |
| `MINIO_MCP_MAX_OBJECT_BYTES` | `1048576` (1 MiB) | Limit for one read and one write. Ceiling 32 MiB. |
@ -186,6 +187,7 @@ cannot be set through `.env`. Defaults shown are the ones in the code.
|---|---|---|
| `MINIO_MCP_API_KEYS` | none, **required** | |
| `MINIO_MCP_INTERNAL_BUCKET_PREFIX` | `exec-` | See above. |
| `MINIO_MCP_INTERNAL_BUCKET_EXPIRE_DAYS` | `7` | See above. |
| `MINIO_MCP_ALLOWED_ENDPOINTS` | empty (any) | |
| `MINIO_MCP_DEFAULT_REGION` | `us-east-1` | |
| `MINIO_MCP_MAX_OBJECT_BYTES` | `1048576` | Ceiling 32 MiB. |

1
mcp-stack.compose.yml
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@ -203,6 +203,7 @@ services:
# created on first use. Only the prefix is this server's. The endpoint is reached over
# minio-egress and, when the allowlist above is set, has to be on it.
MINIO_MCP_INTERNAL_BUCKET_PREFIX: ${MINIO_MCP_INTERNAL_BUCKET_PREFIX:-exec-}
MINIO_MCP_INTERNAL_BUCKET_EXPIRE_DAYS: ${MINIO_MCP_INTERNAL_BUCKET_EXPIRE_DAYS:-7}
user: "${MCP_UID:-10001}:${MCP_GID:-10001}"
read_only: true
tmpfs:

3
mcp-stack.env.example
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@ -26,6 +26,9 @@ MINIO_MCP_MAX_OBJECT_BYTES=1048576
# buckets, and the endpoint must be on MINIO_MCP_ALLOWED_ENDPOINTS when that is set.
#
MINIO_MCP_INTERNAL_BUCKET_PREFIX=exec-
# Days after which the files of an execution's bucket are deleted (a lifecycle rule set when the
# bucket is created). 0 keeps them for ever. The empty bucket itself stays.
MINIO_MCP_INTERNAL_BUCKET_EXPIRE_DAYS=7
# Use a dedicated project directory, never a home directory or filesystem root.
MCP_WORKSPACE_HOST_PATH=/absolute/path/to/project