Tool ·
Open a docker save tar or an OCI image layout and see each layer with its Dockerfile instruction and size, the merged file tree with what every layer added, changed and deleted, wasted space and dive's efficiency score, the config, the platforms in the index, every digest checked — and the packages inside, handed to the SBOM viewer.
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Paste iptables-save or nft list ruleset output and a packet, and step it through the netfilter hooks in the kernel's order — every chain, every rule tested with the reason it matched or didn't, jumps, returns, policies, DNAT and MASQUERADE — to the final verdict; with Docker's and kube-proxy's chains explained.
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How a Java process fills a container's memory limit — heap, metaspace, code cache, thread stacks, direct buffers, GC structures and native memory — with the heap the JVM picks by itself on JDK 17, 21, 25 and 27, the flags that fit, OOMKilled versus OutOfMemoryError, and NMT output to fill it in.
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Paste the output of uptime, dmesg, vmstat, mpstat, pidstat, iostat, free, sar, top, /proc/meminfo, /proc/pressure, ss and cgroup files — several at once, in any order — and get a reading in the style of Brendan Gregg's 60-second checklist and the USE method: what each column means, what is abnormal, what to run next. Plus exit codes and signals (137 OOM-kill vs SIGKILL, 143) for Docker and Kubernetes.
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Paste a command line or a script and see it taken apart — pipes, redirections, && and ||, subshells, loops, quoting, variables, substitutions, globs and here-documents — with every option of 170 common commands explained, warnings for dangerous patterns such as rm -rf $DIR/ and curl | sh, and ShellCheck-style notes on common mistakes.
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A read-only dashboard for your own Docker and Kubernetes through a small local relay: containers, images, volumes and networks with live stats and logs; namespaces, workloads with rollout status, pods, services and endpoints, nodes, events, YAML, and a topology diagram — with every request copyable as curl, docker or kubectl.
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Paste a Dockerfile and see what every instruction does, which ones make layers, what a change rebuilds, how the stages connect and roughly how big the image is — with hadolint-style lints and one-click fixes.
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An animated, step-by-step Linux host running Docker in your browser: docker run through dockerd, containerd and runc to clone(); namespaces, cgroups and the OOM killer; overlayfs copy-up and whiteouts; the build cache; pulling by digest from a registry; the bridge, veths, DNS and NAT; volumes; and the capabilities, seccomp and user namespaces that keep a container in — with a terminal that drives the same diagram.
Tool ·
Build a docker run command from a form, or paste one and get every flag explained — ports, mounts, env, network, limits, healthcheck, security — with warnings, and convert it to a Compose service and back.
Article ·
How I built a modern dev kit for the 3DO Interactive Multiplayer — Norcroft ARM C in Docker, a patched Opera emulator with a GDB server and a JSON control port, and an MCP server — and used it to ship a demo and 21 games.