A provider overlay keyed on services.mcp.enabled and .shared admitted every
MCP-capable role, servers included, because those flags carry no direction. Each
provider's network therefore collected every other provider and the result was a
mesh in which any sidecar could reach any application. The new mcp_client
consumer kind additionally requires services.mcp.direction to be client or both,
and the four provider overlays switch to it.
A sidecar rendered its networks with the same lookup as its provider and
inherited that provider's consumer attachments, which it neither needs nor
should have. own_network_only keeps it on the provider network alone. A provider
whose own topology is default_net contributes no attachment line at all, and a
bare networks: key is not a list, so the flag returns nothing in that case and
lets the sidecar fall back to the project default, which is that provider's own
network.
Provision a personal access token carrying the mcp scope through the
rails runner. The role deploys the cloud-native images, which ship no
omnibus gitlab-rails wrapper, so the invocation names the rails binary
under /srv/gitlab/bin.
Attach clients through the role's overlay, keyed on the MCP service
flags, so a client container reaches the endpoint without publishing it.
Record what upstream does not enforce: the mcp scope grants read and
create, GitLab offers no server-side read-only mode, and the only filter
is a per-request header this deployment does not send. The tool policy in
meta/services.yml is therefore declarative, and every call carries the
blast radius of the root account. The endpoint additionally requires
Premium or Ultimate, so a Community deployment cannot reach it at all.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Extract the csp, domains, and networks blocks out of roles/*/meta/server.yml
into dedicated meta files, each mapping to its own top-level applications key
via the recursive meta-walk:
csp: -> meta/csp.yml -> applications.<app>.csp
domains: -> meta/domains.yml -> applications.<app>.domains
networks: -> meta/networks.yml -> applications.<app>.networks
Residual nginx/proxy keys (status_codes, client_max_body_size, locations,
ip6_enabled, config_upstream_url) stay in server.yml; an emptied server.yml is
deleted. 98 server.yml -> 249 new files, 74 deleted.
- Consumers repointed applications.<app>.server.{csp,domains,networks} ->
applications.<app>.{csp,domains,networks} across templates, vars, tasks,
lookups and filters.
- Infra readers migrated: canonical_domains_map, application_domain_index,
build_ldap_role_entries, service-registry overlay discovery,
roles_with_service, and the file-based readers utils/domains/list.py +
utils/meta/scan.py (read the now-deleted server.yml directly).
- Detection + mapping: _META_TOPICS gains csp/domains/networks;
ROLE_FILE_META_{CSP,DOMAINS,NETWORKS} constants + ROLE_FILES entries.
- New self-expiring lint guard (test_server_meta_no_split_fields) fails if a
server.yml still carries a split field; auto-fails from 2026-12-28 as a
delete reminder.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
evangelostsak
kevinveenbirkenbach
