DevOps Tools, CI/CD and Automation Guides - Page 8

Log in to container registries with podman login — auth.json locations for rootless and rootful, --password-stdin, --authfile, REGISTRY_AUTH_FILE, credential helpers, secrets, logout, and a CI pattern on Podman 5.8.2.

Configure Podman auto-update on Quadlet-managed containers — AutoUpdate registry vs local, podman-auto-update.timer, dry-run checks, proving container recreation, rollback limits with sdnotify and Notify=healthy, and …

Manage Podman Quadlet declarations with podman quadlet install, list, print, and rm — single files, asset bundles, application directories, .quadlets multi-unit sources, list filters, --replace updates, and …

Run Podman containers as systemd services with Quadlet — the generator model, search paths, your first .container file, service vs container naming, why systemctl enable fails, [Install] boot wiring, daemon-reload, logs, …

Use podman unshare to enter the rootless user namespace — inspect uid_map, read file ownership as Podman sees it, fix mapped paths with unshare chown, mount container rootfs, and debug bridge networking with …

Compare rootless and rootful Podman — user namespace mapping, separate image stores, pasta vs bridge networking, privileged-port limits, device node creation, CRIU checkpoint, NFS storage nuance, and when to pick each …

How to run Podman as a normal Linux user with subuid and subgid, verify uid_map mappings, fix not-enough-IDs and XDG_RUNTIME_DIR errors, use podman system migrate after range changes, and avoid destructive resets.

How rootless Podman networking works with pasta as the Podman 5 default — host address copying, outbound Internet access, host.containers.internal, pasta options, rootless Netavark bridges, rootlessport source-IP …

How Podman resolves container names with Aardvark DNS — DNSEnabled on default vs user networks, getent and aliases, resolv.conf and --dns forwarding, internal network behavior, and a diagnostic sequence for name vs …

Publish container ports with Podman -p and -P — host-to-container mapping, loopback and host-IP binding, random ports, TCP and UDP, port ranges, podman port, pod-level publishing, network-mode limits, and rootless pasta …

Pull container images with podman pull — fully qualified names, tags and digests, podman search, pull policies, multi-architecture pulls with --arch and --platform, registry examples, retries, and routing common pull …

Git unstage command reference for git restore --staged, git reset HEAD, git rm --cached, folders, and full index clears — with status checks and edge cases before commit.

Use git commit --amend to add forgotten files, fix the author or date on the last commit, amend without changing the message, recover from a bad amend with reflog, and safely force-push a rewritten commit.

Change the last, older, multiple, or already-pushed Git commit messages using amend and interactive rebase, with safe force-push and recovery examples.

Undo git add without losing edits: read git status -sb, unstage one file with git restore --staged, undo git add . with git restore --staged . or git reset, and handle staged deletions before commit. For full unstage …

Compare git merge and git rebase on the same branch split: merge commits preserve branch history, rebase replays commits for a linear log, fast-forward merges skip the merge commit, and pull --rebase vs merge pull change …

Use .gitignore to hide build output, logs, and env files from git status: wildcard patterns, folder rules, negation with !, git check-ignore debugging, git rm --cached for already-tracked files, and local or global …

Learn what git init does with simple examples. Understand how to initialize a Git repository, what happens after git init, git init vs git clone differences, and how to use git init in real workflows.

Fix Git detached HEAD: recognize HEAD (no branch), inspect an old commit with git switch --detach, save work with git switch -c, return with git switch main, and recover orphaned commits using git reflog.

List Git branches by goal: git branch for local names, git branch -r for remote-tracking branches after fetch, git branch -a for both, and git branch -vv for upstream tracking — with filter, sort, and prune examples.

Go back to a previous Git commit safely: git revert for pushed history, git reset for local-only branch moves, git switch --detach to inspect an old snapshot, and git restore --source for one file — with a decision table …

Use git reset --soft, --mixed, and --hard to move HEAD, unstage with git reset HEAD file, discard tracked edits with git reset --hard HEAD, or match origin after git fetch — with the smallest mode for each goal.

Discard uncommitted Git changes after reading git status: git restore for unstaged edits, git restore --staged --worktree for one MM file, git reset --hard HEAD for all tracked files, and git clean for untracked paths.

Fix "fatal: couldn't find remote ref main" by listing remote branches with git ls-remote --branches, using the branch name the server publishes, or pushing the branch when it exists only locally.

Fix "cannot delete branch checked out at" and "cannot delete branch used by worktree" by checking git branch and git worktree list, switching away or freeing the linked worktree, then deleting with git branch -d.

Fix "Pulling is not possible because you have unmerged files" with git status, resolve conflict markers, git add, git commit or --continue, or abort the in-progress merge, rebase, or cherry-pick.

Git rebase explained with ASCII flow diagrams, feature-branch replay onto main, conflict resolution with git status, remote rebase, force-with-lease, interactive rebase, and when to use rebase instead of merge.

Compare the best automation testing tools in {year} for Linux and CI pipelines, including Playwright, Selenium, Cypress, Appium, pytest, REST Assured, Robot Framework, k6, and JMeter, with guidance on test types, …

Compare the best open source and self-hosted application performance monitoring tools in {year}, including SigNoz, Apache SkyWalking, OpenObserve, Coroot, Glowroot, and the Grafana stack, with guidance on OpenTelemetry …

Learn how Linux applications are empowering tech-savvy kids to transform the classroom. Also, understand how to use this excellent software for education.