mirror of
https://github.com/zrepl/zrepl.git
synced 2024-11-22 08:23:50 +01:00
149 lines
8.4 KiB
Markdown
149 lines
8.4 KiB
Markdown
[](https://github.com/zrepl/zrepl/blob/master/LICENSE)
|
||
[](https://golang.org/)
|
||
[](https://zrepl.github.io)
|
||
[](https://www.patreon.com/zrepl)
|
||
[](https://liberapay.com/zrepl/donate)
|
||
[](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=R5QSXJVYHGX96)
|
||
[](https://twitter.com/intent/tweet?text=Wow:&url=https%3A%2F%2Fgithub.com%2Fzrepl%2Fzrepl)
|
||
|
||
# zrepl
|
||
zrepl is a one-stop ZFS backup & replication solution.
|
||
|
||
## User Documentation
|
||
|
||
**User Documentation** can be found at [zrepl.github.io](https://zrepl.github.io).
|
||
|
||
## Bug Reports
|
||
|
||
1. If the issue is reproducible, enable debug logging, reproduce and capture the log.
|
||
2. Open an issue on GitHub, with logs pasted as GitHub gists / inline.
|
||
|
||
## Feature Requests
|
||
|
||
1. Does you feature request require default values / some kind of configuration?
|
||
If so, think of an expressive configuration example.
|
||
2. Think of at least one use case that generalizes from your concrete application.
|
||
3. Open an issue on GitHub with example conf & use case attached.
|
||
4. **Optional**: [Post a bounty](https://www.bountysource.com/teams/zrepl) on the issue, or [contact Christian Schwarz](https://cschwarz.com) for contract work.
|
||
|
||
The above does not apply if you already implemented everything.
|
||
Check out the *Coding Workflow* section below for details.
|
||
|
||
## Package Maintainer Information
|
||
|
||
* Follow the steps in `docs/installation.rst -> Compiling from Source` and read the Makefile / shell scripts used in this process.
|
||
* Make sure your distro is compatible with the paths in `docs/installation.rst`.
|
||
* Ship a default config that adheres to your distro's `hier` and logging system.
|
||
* Ship a service manager file and _please_ try to upstream it to this repository.
|
||
* `dist/systemd` contains a Systemd unit template.
|
||
* Ship other material provided in `./dist`, e.g. in `/usr/share/zrepl/`.
|
||
* Use `make release ZREPL_VERSION='mydistro-1.2.3_1'`
|
||
* Your distro's name and any versioning supplemental to zrepl's (e.g. package revision) should be in this string
|
||
* Use `make platformtest` **on a test system** to validate that zrepl's abstractions on top of ZFS work with the system ZFS.
|
||
* Make sure you are informed about new zrepl versions, e.g. by subscribing to GitHub's release RSS feed.
|
||
|
||
## Developer Documentation
|
||
|
||
zrepl is written in [Go](https://golang.org) and uses [Go modules](https://github.com/golang/go/wiki/Modules) to manage dependencies.
|
||
The documentation is written in [ReStructured Text](http://docutils.sourceforge.net/rst.html) using the [Sphinx](https://www.sphinx-doc.org) framework.
|
||
|
||
To get started, run `./lazy.sh devsetup` to easily install build dependencies and read `docs/installation.rst -> Compiling from Source`.
|
||
`lazy.sh` uses `python3-pip` to fetch the build dependencies for the docs - you might want to use a [venv](https://docs.python.org/3/library/venv.html).
|
||
If you just want to install the Go dependencies, run `./lazy.sh godep`.
|
||
|
||
### Project Structure
|
||
|
||
```
|
||
├── artifacts # build artifcats generate by make
|
||
├── cli # wrapper around CLI package cobra
|
||
├── client # all subcommands that are not `daemon`
|
||
├── config # config data types (=> package yaml-config)
|
||
│ └── samples
|
||
├── daemon # the implementation of `zrepl daemon` subcommand
|
||
│ ├── filters
|
||
│ ├── hooks # snapshot hooks
|
||
│ ├── job # job implementations
|
||
│ ├── logging # logging outlets + formatters
|
||
│ ├── nethelpers
|
||
│ ├── prometheus
|
||
│ ├── pruner # pruner implementation
|
||
│ ├── snapper # snapshotter implementation
|
||
├── dist # supplemental material for users & package maintainers
|
||
├── docs # sphinx-based documentation
|
||
│ ├── **/*.rst # documentation in reStructuredText
|
||
│ ├── sphinxconf
|
||
│ │ └── conf.py # sphinx config (see commit 445a280 why its not in docs/)
|
||
│ ├── requirements.txt # pip3 requirements to build documentation
|
||
│ ├── publish.sh # shell script for automated rendering & deploy to zrepl.github.io repo
|
||
│ └── public_git # checkout of zrepl.github.io managed by above shell script
|
||
├── endpoint # implementation of replication endpoints (=> package replication)
|
||
├── logger # our own logger package
|
||
├── platformtest # test suite for our zfs abstractions (error classification, etc)
|
||
├── pruning # pruning rules (the logic, not the actual execution)
|
||
│ └── retentiongrid
|
||
├── replication
|
||
│ ├── driver # the driver of the replication logic (status reporting, error handling)
|
||
│ ├── logic # planning & executing replication steps via rpc
|
||
| | └── pdu # the generated gRPC & protobuf code used in replication (and endpoints)
|
||
│ └── report # the JSON-serializable report datastructures exposed to the client
|
||
├── rpc # the hybrid gRPC + ./dataconn RPC client: connects to a remote replication.Endpoint
|
||
│ ├── dataconn # Bulk data-transfer RPC protocol
|
||
│ ├── grpcclientidentity # adaptor to inject package transport's 'client identity' concept into gRPC contexts
|
||
│ ├── netadaptor # adaptor to convert a package transport's Connecter and Listener into net.* primitives
|
||
│ ├── transportmux # TCP connecter and listener used to split control & data traffic
|
||
│ └── versionhandshake # replication protocol version handshake perfomed on newly established connections
|
||
├── tlsconf # abstraction for Go TLS server + client config
|
||
├── transport # transport implementations
|
||
│ ├── fromconfig
|
||
│ ├── local
|
||
│ ├── ssh
|
||
│ ├── tcp
|
||
│ └── tls
|
||
├── util
|
||
├── version # abstraction for versions (filled during build by Makefile)
|
||
└── zfs # zfs(8) wrappers
|
||
```
|
||
|
||
### Coding Workflow
|
||
|
||
* Open an issue when starting to hack on a new feature
|
||
* Commits should reference the issue they are related to
|
||
* Docs improvements not documenting new features do not require an issue.
|
||
|
||
### Breaking Changes
|
||
|
||
Backward-incompatible changes must be documented in the git commit message and are listed in `docs/changelog.rst`.
|
||
|
||
* Config-breaking changes must contain a line `BREAK CONFIG` in the commit message
|
||
* Other breaking changes must contain a line `BREAK` in the commit message
|
||
|
||
### Glossary & Naming Inconsistencies
|
||
|
||
In ZFS, *dataset* refers to the objects *filesystem*, *ZVOL* and *snapshot*. <br />
|
||
However, we need a word for *filesystem* & *ZVOL* but not a snapshot, bookmark, etc.
|
||
|
||
Toward the user, the following terminology is used:
|
||
|
||
* **filesystem**: a ZFS filesystem or a ZVOL
|
||
* **filesystem version**: a ZFS snapshot or a bookmark
|
||
|
||
Sadly, the zrepl implementation is inconsistent in its use of these words:
|
||
variables and types are often named *dataset* when they in fact refer to a *filesystem*.
|
||
|
||
There will not be a big refactoring (an attempt was made, but it's destroying too much history without much gain).
|
||
|
||
However, new contributions & patches should fix naming without further notice in the commit message.
|
||
|
||
### RPC debugging
|
||
|
||
Optionally, there are various RPC-related environment varibles, that if set to something != `""` will produce additional debug output on stderr:
|
||
|
||
https://github.com/zrepl/zrepl/blob/master/rpc/rpc_debug.go#L11
|
||
|
||
https://github.com/zrepl/zrepl/blob/master/rpc/dataconn/dataconn_debug.go#L11
|
||
|
||
https://github.com/zrepl/zrepl/blob/master/rpc/dataconn/stream/stream_debug.go#L11
|
||
|
||
https://github.com/zrepl/zrepl/blob/master/rpc/dataconn/heartbeatconn/heartbeatconn_debug.go#L11
|
||
|