fix: pin Watchtower DOCKER_API_VERSION for Docker Engine 28+

[taobojlen]

Watchtower 1.7.1's Docker SDK defaults to Docker API version 1.25, which is too old for Docker Engine 28+. On modern hosts the override fails to talk to dockerd.

Pins the API version explicitly via DOCKER_API_VERSION=1.44 in the watchtower service environment: list so the SDK negotiates a supported API version.

One-line change to docker-compose.override.example.yaml; nothing else touched.

[cubic-dev-ai]

1 issue found across 1 file

Prompt for AI agents (unresolved issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="docker-compose.override.example.yaml">

<violation number="1" location="docker-compose.override.example.yaml:25">
P2: This override's comment misidentifies the affected daemon version, and the unconditional pin introduces a compatibility regression for Docker Engine 24 and older because those daemons reject client API 1.44 as too new. Correct the version rationale and either preserve negotiation or document/enforce a Docker Engine 25+ prerequisite for this example.</violation>
</file>

<sub>Reply with feedback, questions, or to request a fix.

Re-trigger cubic</sub>

[cubic-dev-ai]

P2: This override's comment misidentifies the affected daemon version, and the unconditional pin introduces a compatibility regression for Docker Engine 24 and older because those daemons reject client API 1.44 as too new. Correct the version rationale and either preserve negotiation or document/enforce a Docker Engine 25+ prerequisite for this example.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. At docker-compose.override.example.yaml, line 25:

<comment>This override's comment misidentifies the affected daemon version, and the unconditional pin introduces a compatibility regression for Docker Engine 24 and older because those daemons reject client API 1.44 as too new. Correct the version rationale and either preserve negotiation or document/enforce a Docker Engine 25+ prerequisite for this example.</comment>

<file context>
@@ -22,3 +22,4 @@ services:
       - WATCHTOWER_LABEL_ENABLE=true   # ONLY update opted-in containers — never db
       - WATCHTOWER_POLL_INTERVAL=300   # poll GHCR every 5 min
       - WATCHTOWER_CLEANUP=true        # delete old images after updating
+      - DOCKER_API_VERSION=1.44        # watchtower 1.7.1's SDK defaults to 1.25, too old for Docker Engine 28+
</file context>