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136 lines
7.4 KiB
Markdown
136 lines
7.4 KiB
Markdown
[](https://github.com/zrepl/zrepl/blob/master/LICENSE)
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[](https://golang.org/)
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[](https://zrepl.github.io)
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[](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=R5QSXJVYHGX96)
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[](https://liberapay.com/zrepl/donate)
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[](https://twitter.com/intent/tweet?text=Wow:&url=https%3A%2F%2Fgithub.com%2Fzrepl%2Fzrepl)
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# zrepl
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zrepl is a one-stop ZFS backup & replication solution.
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## User Documentation
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**User Documentation** can be found at [zrepl.github.io](https://zrepl.github.io).
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## Bug Reports
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1. If the issue is reproducible, enable debug logging, reproduce and capture the log.
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2. Open an issue on GitHub, with logs pasted as GitHub gists / inline.
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## Feature Requests
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1. Does you feature request require default values / some kind of configuration?
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If so, think of an expressive configuration example.
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2. Think of at least one use case that generalizes from your concrete application.
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3. Open an issue on GitHub with example conf & use case attached.
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The above does not apply if you already implemented everything.
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Check out the *Coding Workflow* section below for details.
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## Package Maintainer Information
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* Follow the steps in `docs/installation.rst -> Compiling from Source` and read the Makefile / shell scripts used in this process.
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* Make sure your distro is compatible with the paths in `docs/installation.rst`.
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* Ship a default config that adheres to your distro's `hier` and logging system.
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* Ship a service manager file and _please_ try to upstream it to this repository.
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* `dist/systemd` contains a Systemd unit template.
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* Ship other material provided in `./dist`, e.g. in `/usr/share/zrepl/`.
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* Use `make release ZREPL_VERSION='mydistro-1.2.3_1'`
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* Your distro's name and any versioning supplemental to zrepl's (e.g. package revision) should be in this string
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* Make sure you are informed about new zrepl versions, e.g. by subscribing to GitHub's release RSS feed.
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## Developer Documentation
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zrepl is written in [Go](https://golang.org) and uses [`dep`](https://github.com/golang/dep) to manage dependencies.
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The documentation is written in [ReStructured Text](http://docutils.sourceforge.net/rst.html) using the [Sphinx](https://www.sphinx-doc.org) framework.
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To get started, run `./lazy.sh devsetup` to easily install build dependencies and read `docs/installation.rst -> Compiling from Source`.
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### Overall Architecture
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The application architecture is documented as part of the user docs in the *Implementation* section (`docs/content/impl`).
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Make sure to develop an understanding how zrepl is typically used by studying the user docs first.
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### Project Structure
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```
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├── artifacts # build artifcats generate by make
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├── cli # wrapper around CLI package cobra
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├── client # all subcommands that are not `daemon`
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├── config # config data types (=> package yaml-config)
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│ └── samples
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├── daemon # the implementation of `zrepl daemon` subcommand
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│ ├── filters
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│ ├── job # job implementations
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│ ├── logging # logging outlets + formatters
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│ ├── nethelpers
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│ ├── prometheus
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│ ├── pruner # pruner implementation
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│ ├── snapper # snapshotter implementation
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├── docs # sphinx-based documentation
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├── dist # supplemental material for users & package maintainers
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│ ├── **/*.rst # documentation in reStructuredText
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│ ├── sphinxconf
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│ │ └── conf.py # sphinx config (see commit 445a280 why its not in docs/)
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│ ├── requirements.txt # pip3 requirements to build documentation
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│ ├── publish.sh # shell script for automated rendering & deploy to zrepl.github.io repo
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│ └── public_git # checkout of zrepl.github.io managed by above shell script
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├── endpoint # implementation of replication endpoints (=> package replication)
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├── logger # our own logger package
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├── pruning # pruning rules (the logic, not the actual execution)
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│ └── retentiongrid
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├── replication
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│ ├── driver # the driver of the replication logic (status reporting, error handling)
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│ ├── logic # planning & executing replication steps via rpc
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| | └── pdu # the generated gRPC & protobuf code used in replication (and endpoints)
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│ └── report # the JSON-serializable report datastructures exposed to the client
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├── rpc # the hybrid gRPC + ./dataconn RPC client: connects to a remote replication.Endpoint
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│ ├── dataconn # Bulk data-transfer RPC protocol
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│ ├── grpcclientidentity # adaptor to inject package transport's 'client identity' concept into gRPC contexts
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│ ├── netadaptor # adaptor to convert a package transport's Connecter and Listener into net.* primitives
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│ ├── transportmux # TCP connecter and listener used to split control & data traffic
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│ └── versionhandshake # replication protocol version handshake perfomed on newly established connections
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├── tlsconf # abstraction for Go TLS server + client config
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├── transport # transports implementation
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│ ├── fromconfig
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│ ├── local
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│ ├── ssh
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│ ├── tcp
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│ └── tls
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├── util
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├── vendor # managed by dep
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├── version # abstraction for versions (filled during build by Makefile)
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└── zfs # zfs(8) wrappers
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```
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### Coding Workflow
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* Open an issue when starting to hack on a new feature
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* Commits should reference the issue they are related to
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* Docs improvements not documenting new features do not require an issue.
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### Breaking Changes
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Backward-incompatible changes must be documented in the git commit message and are listed in `docs/changelog.rst`.
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* Config-breaking changes must contain a line `BREAK CONFIG` in the commit message
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* Other breaking changes must contain a line `BREAK` in the commit message
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### Glossary & Naming Inconsistencies
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In ZFS, *dataset* refers to the objects *filesystem*, *ZVOL* and *snapshot*. <br />
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However, we need a word for *filesystem* & *ZVOL* but not a snapshot, bookmark, etc.
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Toward the user, the following terminology is used:
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* **filesystem**: a ZFS filesystem or a ZVOL
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* **filesystem version**: a ZFS snapshot or a bookmark
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Sadly, the zrepl implementation is inconsistent in its use of these words:
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variables and types are often named *dataset* when they in fact refer to a *filesystem*.
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There will not be a big refactoring (an attempt was made, but it's destroying too much history without much gain).
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However, new contributions & patches should fix naming without further notice in the commit message.
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