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Use Git to track a deliberate, sanitized set of server configuration files—not an indiscriminate copy of /etc. Keep desired policy and deployment code in a restricted repository, exclude secrets and runtime state, review every change, validate files before activation, and deploy a specific reviewed commit so rollback is unambiguous.
The workflow below covers repository layout, initialization, ignore rules, secret handling, permissions, bare remotes, validation hooks, deployment, drift review, and recovery.
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Decide what Git should represent
Git is most useful for declarative inputs that explain the server’s intended state. A configuration repository should let an administrator answer: which policy was approved, who changed it, what was validated, and which commit is running. It should not become a dump of every file a machine happens to contain.
| Good candidates for version control | Keep out of the repository | Safer alternative |
|---|---|---|
| Service configuration and drop-ins | Passwords, API tokens, private keys, and database credentials | Secret manager or deployment-time injection |
| Systemd unit files and overrides | Logs, caches, temporary files, and runtime sockets | Regenerate them on the host |
| Firewall policy templates | Machine-specific identity files | Host-local protected files managed separately |
| Monitoring configuration | Complete copies of sensitive files such as /etc/shadow |
Track a documented policy or sanitized example |
| Deployment and validation scripts | Generated output and ephemeral state | Build or generate it during deployment |
| Sanitized examples with placeholders | Live files containing credentials | Version app.conf.example or secrets.env.example |
Do not run git init at the filesystem root and then add everything. A broad repository can capture credentials, host keys, volatile data, and unrelated operating-system state before you notice. Start with a dedicated administrative directory and copy or render only the files that belong to the server’s desired state.
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Choose a repository boundary and layout
A per-host repository mirrors one machine’s configuration and makes drift easy to inspect. A shared role or environment repository improves reuse, but it needs explicit overlays for host-specific values. Choose one boundary before initializing Git; changing the boundary later can leave sensitive or unrelated history behind.
A practical directory layout is:
server-config/
├── README.md
├── files/ # sanitized or directly deployable config
├── systemd/ # unit files and drop-ins
├── scripts/ # validation and deployment helpers
├── examples/ # placeholder-based examples
├── .gitignore
└── .gitattributesDocument in README.md which repository path maps to which live path, which user owns each file, required modes, validation commands, reload procedures, and the rollback method. Keep production write access limited to the administrators who may change policy.
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Initialize Git deliberately
Install Git using your operating system’s supported package process, create the administrative directory with restricted ownership, and initialize only that directory. The official git-init documentation describes initialization plainly: “This command creates an empty Git repository.”
-
Create and enter the repository directory:
sudo install -d -m 0750 -o root -g admins /srv/server-config cd /srv/server-config -
Select the initial branch explicitly. Replace
mainwith your organization’s branch name if necessary:git init --initial-branch=mainThe
--initial-branch=<branch-name>option is documented by Git and avoids inheriting a local default you did not intend. -
If several administrators will share the repository, you may establish group-oriented permissions during initialization:
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Set repository-local identity and policy where appropriate. Repository configuration is stored in
.git/config; Git also supports worktree configuration, system configuration in/etc/gitconfig, and user fallback configuration in~/.gitconfig. See the git-config documentation before changing a system-wide setting.
Create a clean baseline
Populate files/, systemd/, scripts/, and examples/ with only the intended material. Create ignore rules before adding files so an accidental secret is less likely to enter the index.
cat > .gitignore <<'EOF'
# Live secret-bearing files
app.conf
secrets.env
*.pem
*.key
# Runtime and generated state
*.log
run/
cache/
EOF
cat > examples/app.conf.example <<'EOF'
endpoint = https://service.example.invalid
api_token = REPLACE_AT_DEPLOYMENT
EOFReview the candidate set, stage deliberately, inspect the staged patch, and commit an explainable baseline:
git status --short
git add README.md files/ systemd/ scripts/ examples/ .gitignore .gitattributes
git diff --cached
git commit -m "Baseline web and SSH configuration"The Git initialization example also uses git init, git add ., and git commit to record an initial state, but explicit paths are safer for a server repository because they make the boundary visible. Never skip the staged diff: it is the last straightforward place to catch a password, host-specific identity, or unintended file before it becomes history.
Review configuration drift on every change
Use a small, focused commit for each operational change. A reviewer should be able to explain which service or policy changes, why it changes, and how it will be validated. A useful inspection cycle is:
-
Check the working tree:
git status -
Inspect unstaged edits:
git diff -
Stage only the intended files and inspect the exact proposed commit:
git add systemd/sshd.service.d/override.conf git diff --cached -
Commit with an operational message:
git commit -m "Harden SSH service settings" -
Inspect history and a particular change:
git log --oneline --decorate -n 20 git show <commit>
On a host, compare the repository’s desired files with the live locations using a controlled script or deployment tool. Do not edit a live file and assume Git has captured it; either make the change in the repository and deploy it, or deliberately import and review the live change before committing.
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Use ignore rules without mistaking them for secret protection
Repository-specific patterns belong in .gitignore. Git also supports a per-user global excludes file through core.excludesFile. The GitHub guide to ignoring files explains global ignores and maintains recommended pattern collections; use a global file for personal editor or operating-system noise, not as a substitute for a repository policy.
git config --global core.excludesFile ~/.config/git/ignore
printf '*.swpn.DS_Storen' >> ~/.config/git/ignore.gitignore affects matching untracked files during normal adds. It does not remove a file that was already committed. If a credential entered history:
- Revoke or rotate the credential immediately, because deleting a line from the current file does not invalidate old commits.
- Preserve the incident record required by your organization.
- Use the approved history-remediation process to remove the sensitive object, then force-push only under an explicit, coordinated policy.
- Assume any clone, backup, or fork containing the old commit may still hold the value.
Never commit private keys, API tokens, database passwords, TLS private material, host identity files, or complete sensitive files. Use a secret manager, protected files with separately managed permissions, deployment-time injection, or encrypted configuration when policy requires it. Templates should contain placeholders and no production secret.
Set ownership and permissions intentionally
Git records content and selected metadata, but it is not a complete replacement for filesystem access control. Decide which account owns the repository, who may write to it, and which account performs deployment. Inspect both the repository directory and the checked-out files after initialization and after every deployment.
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- Give write access only to administrators who can approve production policy.
- Use a dedicated group for shared administration and review its membership regularly.
- Keep deployment credentials separate from ordinary read-only access.
- Apply the required owner and mode to live files after checkout; do not assume a repository clone reproduces every host-specific permission.
- Keep the repository itself outside publicly served directories and protect backups of its object database.
If you use git init --shared=<mode>, verify the result against local groups, umask, ACLs, and security requirements. Shared repository permissions are a starting point, not a complete authorization design.
Choose a remote and deployment model
A normal repository has a working tree and is convenient for editing and inspection. A bare repository has no working directory and is appropriate as a central remote. The Pro Git book describes exporting a repository into a bare repository “that doesn’t contain a working directory,” and the Git init tutorial identifies git init --bare as the common way to create a central remote.
| Approach | Use it when | Important limitation |
|---|---|---|
| Working-tree repository | Administrators need to edit, inspect, and run local validation | The checkout is not automatically the live configuration |
| Bare remote | A central authenticated endpoint should receive pushes | It contains Git objects but no files to serve as /etc |
| Manual pull/apply | Changes are infrequent and an operator should approve each activation | Repeatability depends on a documented procedure |
| Controlled hook or CI job | You need consistent validation, logging, and promotion | Automation must enforce permissions, rollback, and an explicit restart policy |
Create a bare remote on a protected account or host, for example:
sudo install -d -m 0750 -o git -g admins /srv/git/server-config.git
sudo -u git git init --bare --initial-branch=main /srv/git/server-config.gitAdministrators push to it over authenticated SSH. The remote should not be treated as the live /etc tree. A safe promotion sequence is:
- Push a reviewed commit to the bare remote.
- Check out or export that exact commit into a separate staging directory.
- Run syntax, policy, ownership, mode, and secret-detection checks against the staged files.
- Record the commit identifier and validation result.
- Have an operator or controlled deployment process promote the validated files to their live locations.
- Reload or restart only the affected services according to an auditable policy.
- Record the activation time, operator, commit, and service result.
Keeping staging separate from live paths prevents a partially checked-out tree from becoming production configuration. It also makes rollback a deliberate promotion of a previously reviewed commit.
Separate templates, host overlays, and injected secrets
Directly tracking a complete, ready-to-run file is simple, but it can expose credentials and make one host’s identity look like a universal policy. Templates plus injected secrets reduce disclosure and support reuse, at the cost of deployment plumbing.
| Design | Strength | Trade-off |
|---|---|---|
| Directly tracked sanitized files | Easy to read and deploy | Requires strict review to avoid secret or host leakage |
| Templates with runtime values | Separates policy from confidential data | Needs a renderer, secret source, and tests for missing variables |
| Shared role plus host overlay | Reuses common policy while preserving host differences | Overlay precedence must be documented and tested |
| One repository per host | Shows exact machine drift and rollback history | Duplicated policy can diverge across hosts |
Keep variable names and required inputs documented in examples. Ensure the renderer fails when a required secret is absent rather than producing an empty or permissive setting. Do not place generated secret values in build logs, command output, or Git commit messages.
Add validation before activation
Git hooks can stop an unsafe commit locally or on a controlled deployment endpoint. The git init template includes sample hooks, but they remain disabled until the .sample suffix is removed. Git also supports core.hooksPath for centrally configured hooks; both behaviors are documented in the git-init manual and git-config manual.
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- Run the target daemon’s own syntax checker against the staged or rendered files.
- Verify that every file has the required owner and mode.
- Reject private-key, token, password, and other secret patterns unless an approved encrypted format is being used.
- Perform a dry run where the service supports one.
- Confirm that referenced paths, users, groups, certificates, and include files exist on the target host.
- Check that the proposed change affects only the intended services and paths.
Hooks should fail closed for high-risk configuration changes. They should not silently restart production services: a restart or reload needs an explicit operational policy, an auditable record, and a recovery path. Test hooks on a non-production checkout, and make their output actionable so an operator can correct the failed check.
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Use immutable commit identifiers in deployment records. A tag or release note can improve readability, but the full commit ID is the definitive reference to the content that was validated.
# On the staging checkout
git fetch --prune origin
git checkout --detach <reviewed-commit>
# Inspect before promotion
git status --short
git show --stat --oneline <reviewed-commit>After validation and promotion, save the deployed commit ID where operators can find it. If a service fails after activation, stop making unrelated edits, capture the failure, and promote the last known-good commit through the same staging and validation path. Do not “fix” a failed deployment by editing live files without recording the resulting state.
Rollback is not merely git reset in a production directory. A reset can alter the checkout without applying required ownership, rendering, or service-reload steps. Treat rollback as a new, auditable deployment of a previously reviewed commit.
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| Decision | Option A | Option B | How to choose |
|---|---|---|---|
| Repository location | Working tree on an administration host | Bare repository as a central remote | Use the working tree for editing and inspection; use a bare repository when a central push endpoint is needed. |
| Configuration contents | Directly tracked files | Templates plus injected values | Prefer templates when secrets or host variation make direct tracking unsafe. |
| Application | Manual pull and operator apply | Controlled hook or CI job | Manual is easier to reason about; automation is repeatable only when validation, permissions, logging, and rollback are built in. |
| Repository scope | One repository per host | Shared role/environment repository | Per-host repositories expose drift; shared repositories reduce duplication but require clear overlays and boundaries. |
Troubleshoot common failures
A secret appears in git status
Stop before staging it. Add a narrow ignore rule or move the file outside the repository, then use a placeholder example. If it was already staged, remove it from the index with git restore --staged <file> and inspect the cached diff again. If it was committed, rotate the credential first and follow the approved history-remediation process.
An ignored file still appears in changes
Ignore rules do not affect an already tracked path. Confirm whether the file is in history, remove it from the index only if policy permits, and keep the live copy outside the repository. Review the pattern’s path and scope rather than adding a broad wildcard that could hide a legitimate configuration change.
The checkout differs from the live server
Identify whether the difference is an intentional local override, generated output, a failed deployment, or unrecorded drift. Compare the live file with the staged or rendered artifact, record the decision, and either commit the approved policy or restore the reviewed version. Do not overwrite a live file until ownership, mode, syntax, and service impact are understood.
A bare remote has no files to edit
That is expected: a bare repository has no working directory. Clone it into a separate working tree for review, or have the deployment process check out a selected commit into staging. Never point a service directly at the bare repository’s object storage.
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Check whether the hook validated the rendered files or only the templates, whether target-only paths and users were available, and whether the reload or restart result was recorded. Improve the validation boundary so it tests the same artifact that will be promoted, then retry from a known-good commit.
Operational checklist
- Repository boundary is a dedicated administrative directory, not the filesystem root.
- Tracked files describe desired state; logs, caches, sockets, generated output, and identities are excluded.
- Secrets are injected or separately protected; examples contain placeholders only.
.gitignorerules were created before the baseline, and staged diffs were reviewed.- Ownership, group access, umask, ACLs, and deployment credentials were checked.
- Every change has a focused commit and an understandable message.
- Validation runs against the exact staged or rendered artifact that will be activated.
- Deployment records include the full commit ID, operator, time, checks, and reload result.
- Rollback has been tested as a promotion of a previously reviewed commit.
- Hooks and automation fail closed for high-risk changes and never restart services silently.
Bottom line
Git gives server configuration a reviewable history only when the repository boundary, secret strategy, permissions, and deployment path are designed deliberately. Track policy and reproducible inputs, keep confidential and runtime data out, validate a staged artifact, and promote a specific commit through a controlled process. That approach captures drift and enables rollback without turning the Git repository into an unsafe copy of the server.
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