Found 26 results for: Container Orchestration
Why services in an OpenVZ container fail with allocation errors while free memory looks fine, and how to find and raise the exhausted User Beancounter limit.
A 2009 reference for VPS users on container-based hosting: why "Cannot allocate memory" appears while free shows RAM, and how to read and fix it.
Official Supabase Docker stack on a clean Ubuntu sandbox: the pooler and Edge Functions crash-looped. Why, and a compose override that fixed both, with tests.
How to tell when an OpenVZ container is being refused resources: read user_beancounters, interpret failcnt, and shrink MySQL and Apache to fit the limits.
Run containers as non-root, with a read-only filesystem, dropped capabilities and a default-deny NetworkPolicy, so one compromised app has little to work with.
A 2009 reference for choosing between a VPS and a dedicated server. It covers how to find and fix OpenVZ memory-limit failures with user_beancounters.
Control planes built on etcd or Raft fail on slow disks. How to test fsync latency, pick between Kubernetes, K3s and Nomad, and prepare a K3s node.
Enforce CIS network sysctl baselines with Ansible, gate deployments on OpenSCAP results, and reject Ingress objects without TLS using an OPA admission policy.
How to remove the single points of failure from a small web cluster in 2009: two HAProxy nodes sharing a VRRP address in front of two or more web nodes.
Build an OpenVPN 2.2 gateway on CentOS 6 with a private CA, and fix the usual failures: missing TUN device, no forwarding or NAT, and iptables rule order.
Building Prometheus from source on a host with older Go and Node than the repo asks for: what the build does, what warns, and how I verified the result.
Dokku's nginx templates listen on [::] by default. Here is why nginx refuses to start on a host without IPv6, and how to fix it, including notes for…
A Bun or Node.js service can be slow on a VPS because of CPU steal or slow disks. How to measure both, fix the host first, and then compare runtimes fairly.
Why Kubernetes, Docker Swarm and Nomad clusters turn flaky on slow disks or stolen CPU, how to measure it with fio and vmstat, and what to change.
How an Nginx API gateway with rate limiting and upstream keepalive, plus an opossum circuit breaker, limits cascading failures between microservices (2022…
Trivy exits 0 even with CRITICAL findings. I built it from source and made it a real CI gate, then found a secret-scan skip that a green result can hide.
How to run a three-node NATS JetStream cluster (server 2.6, nats.go 1.13) with replicated streams, authentication, correct acks and sane OS limits.
Slow or timing-out Jenkins builds are often caused by iowait, swapping and a badly sized JVM heap. How to diagnose and tune each on a 2014-era Linux server.
How to confirm that MySQL 5.5 is stuck on disk I/O, and how to tune the I/O scheduler, ext4 mount options and InnoDB settings for flash or fast virtual storage.
A 2010-era baseline for CentOS 5 and Ubuntu 10.04: key-only SSH, a default-drop iptables policy, sysctl network settings and fewer listening services.
How to set up a single-node edge MQTT aggregator with K3s and WireGuard, and how to fix the faulty flags, units and sysctls that edge guides often repeat.
How to replace hand-run kubectl apply with a pull-based GitOps flow: Argo CD, Kustomize overlays, Sealed Secrets and a CI job that only edits an image tag.
How to link a hyperscaler workload to a database on a Norwegian VPS with WireGuard, what the tunnel does not fix, and the common mistakes in such setups.
How to measure request latency, CPU steal and disk trends on your own server with Nginx timing logs, Prometheus 2.28 and Grafana 8, without a third-party APM.
How to keep a local HAProxy in step with a ZooKeeper service registry: ephemeral znodes, a watcher that regenerates the config, and a graceful reload.
How to keep slow jobs out of the web request path with RabbitMQ, Celery 3.0 and Nginx 1.2 on Debian 7, with corrected configuration and the limits of the setup.