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A Docker healthcheck reports whether its command succeeds. It does not stop the container, replace it, or activate a restart policy by itself. Restart policies wait for the container's main process to terminate—or for Docker's own lifecycle to change—so an unhealthy container can remain Up indefinitely.
That separation ...
HAProxy marks a backend server DOWN when its configured health-check contract fails often enough. That result does not, by itself, prove the application is unavailable to every client. A direct browser request may use another hostname, port, protocol, network path, source address, TLS identity, HTTP method, URI, ...
Kafka consumer lag is not one queue waiting behind one worker. Lag belongs to a consumer group, topic and partition, so a modest group total can hide a single partition that is hours behind while every neighboring partition is current. Start by capturing committed offsets, log-end offsets ...
An etcd NOSPACE alarm means at least one member's backend crossed its configured quota, so the cluster entered limited-operation maintenance mode. Reads and deletes may still work, but normal writes are rejected. Safe recovery is not “clear the alarm and hope”: preserve quorum and a snapshot, compact ...
If repeated Docker builds are consuming VPS storage, do not begin with a system-wide prune. First prove that BuildKit owns the missing space, identify the builder that created it, and inspect which records are reclaimable. A builder-specific prune can then recover eligible cache without deleting named volumes ...
A RabbitMQ node can be running, answering health checks and delivering messages to consumers while every publishing connection is stalled. That split is deliberate: when free space on a node's database partition falls below disk_free_limit, RabbitMQ applies back pressure to publishers so incoming messages do not consume ...
A Kubernetes node drain is safe only when the workload can complete four separate moves: the Eviction API may remove the Pod, another eligible node can place it, the replacement becomes Ready, and the real service still works. A PodDisruptionBudget (PDB) addresses the first condition. It does ...
A new VPS can carry three different clocks. The provider may label it running when the virtual machine starts, cloud-init may report done after its configured stages finish, and the workload may still fail its first real request. Treating those clocks as one status turns a small ...
A private registry becomes part of the deployment path the moment CI pushes an image that production must later pull. Installing Harbor is therefore the easy decision. The harder one is accepting ownership of its certificates, database, artifact storage, scanner data, robot credentials, cleanup jobs and restore ...
Quick answer: put Caddy on public ports 80 and 443, keep the application on a loopback address such as 127.0.0.1:3000, and leave Caddy's administration endpoint local. Check DNS and the upstream first, validate every Caddyfile change, reload instead of restarting, then test both the public route and ...
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