Ansible Role :lock_with_ink_pen: :link: Zcashd

Table of Contents

• Supported Platforms
• Requirements
• Role Variables
  • Install
  • Config
  • Launch
  • Uninstall
• Dependencies
• Example Playbook
• License
• Author Information

Ansible role that installs and configures Zcashd: a client for the Zcash zero-knowledge privacy blockchain/protocol.

Supported Platforms:

* Redhat(CentOS/Fedora)
* Ubuntu
* Debian

Requirements

Requires the unzip/gtar utility to be installed on the target host. See ansible unarchive module notes for details.

Role Variables

Variables are available and organized according to the following software & machine provisioning stages:

• install
• config
• launch
• uninstall

Install

zcashdcan be installed using compressed archives (.tar, .zip) for debian-based installations, downloaded and extracted from various locations, or built from source.

The following variables can be customized to control various aspects of this installation process, ranging from software version and source location of binaries to the installation directory where they are stored:

zcashd_user: <service-user-name> (default: zcashd)

• dedicated service user and group used by zcashd for privilege separation (see here for details)

install_type: <archive> (default: archive)

• archive: currently compatible with tar formats, installation of Zcashd via compressed archives results in the direct download of its component binaries, consisting of the zcashd client and cli software.

  note: archived installation binaries can be obtained from the official releases site or those generated from development/custom sources.

• source: build zcashd binaries from source. This installation process consists of cloning the github hosted repository and building from source code using a provided build script. See here for more details on building from source.

install_dir: </path/to/installation/dir> (default: /opt/zcashd)

• path on target host where the zcashd binaries should be extracted to.

archive_url: <path-or-url-to-archive> (default: see defaults/main.yml)

• address of a compressed tar or zip archive containing zcashd binaries. This method technically supports installation of any available version of zcashd. Links to official versions can be found here.

archive_options: <untar-or-unzip-options> (default: [])

• list of additional unarchival arguments to pass to either the tar or unzip binary at runtime for customizing how the archive is extracted to the designated installation directory. See man tar and man unzip for available options to specify, respectively.

git_url: <path-or-url-to-git-repo> (default: see defaults/main.yml)

• address of zcashd git repository. Address can reference the Github site address or custom source hosted on an alternate git hosting site.

git_version: <string> (default: v2.1.1-1)

• version of the repository to check out. This can be the literal string HEAD, a branch name, a tag name.

Config

Zcashd supports specification of various options controlling aspects of the Zcashd client's behavior and operational profile. Each configuration can be expressed within a simple configuration file, zcashd.conf by default, composed of key=vaue pairs representing the aforementioned configuration properties available. The following details the facilities provided by this role to manage the contents of the aforementioned configuration file.

For a reference to the list of available configuration options, see here.

config_dir: </path/to/configuration/dir> (default: /home/{{ zcashd_user }})

• path on target host where the zcashd configuration file should be rendered

Each of these configurations can be expressed using the zcashd_config hash, which contains a list of various zcashd configuration options (hash) objects organized according to the following:

• network-related - settings related to client network broadcasting and listening properties
• json-rpc - JSON-RPC server interfacing properties
• transaction-fee - client properties managing cost of verifying network transactions
• miscellaneous - additional properties managing client mining and privacy protection operations

Each zcashd_config entry is a key-value pair representing the equivalent of a configuration setting as expected to be expressed by the zcashd server.

[zcashd_config:]: <hash> (default: required)

• configuration key-value pair to render within the configuration file

Example

 zcashd_config:
   testnet: 1
   addnode: testnet.z.cash
   server: 1
   bind: 0.0.0.0

Launch

This role supports launching zcashd utilizing the systemd service management tool, which manages the service as a background process or daemon subject to the configuration and execution potential provided by its underlying management framework.

The following variables can be customized to manage the service's systemd [Service] unit definition and execution profile/policy:

extra_run_args: <zcashd-cli-options> (default: [])

• list of zcashd commandline arguments to pass to the binary at runtime for customizing launch

Supporting full expression of zcashd's cli and, consequently the full set of configuration options as referenced and described above, this variable enables the launch to be customized according to the user's specification.

Example

 extra_run_args: '-showmetrics -metricsui -rpcbind 0.0.0.0' 

custom_unit_properties: <hash-of-systemd-service-settings> (default: [])

• hash of settings used to customize the [Service] unit configuration and execution environment of the zcashd systemd service.

Example

 custom_unit_properties:
   Environment: 'ZADDR=zs1examplea4lqxrtmlpkayj0hxpfdd3ve62xhd7jds8c2a8tqz5kekplt469eza5wu8djdvpauezv'
   Restart: on-failure
   ExecReload: /bin/kill -HUP $MAINPID
   LimitDATA: 1G

Uninstall

Support for uninstalling and removing artifacts necessary for provisioning allows for users/operators to return a target host to its configured state prior to application of this role. This can be useful for recycling nodes and perhaps providing more graceful/managed transitions between tooling upgrades.

The following variable(s) can be customized to manage this uninstall process:

perform_uninstall: <true | false> (default: false)

• whether to uninstall and remove all artifacts and remnants of this zcashd installation on a target host (see: handlers/main.yml for details)

Dependencies

• 0x0i.systemd

Example Playbook

default example:

- hosts: all
  roles:
  - role: 0x0I.zcashd

perform specific archive version installation:

- hosts: all
  roles:
  - role: 0x0I.zcashd
    vars:
      install_type: archive
      archive_url: https://z.cash/downloads/zcash-2.0.7-3-linux64-debian-jessie.tar.gz

perform specific git source build installation:

- hosts: all
  roles:
  - role: 0x0I.zcashd
    vars:
      install_type: source
      git_url: https://github.com/zcash/zcash.git
      git_version: v2.0.7-3

connect client to test network:

- hosts: all
  roles:
  - role: 0x0I.zcashd
    vars:
      zcashd_config:
        testnet: 1
        addnode: testnet.z.cash

enable CPU mining with more efficient hash algorithm solver(exposing ALL cores for use):

- hosts: all
  roles:
  - role: 0x0I.zcashd
    vars:
      zcashd_config:
        gen: 1
        genproclimit: -1
        equihashsolver: tromp

License

MIT

Author Information

This role was created in 2020 by O1.IO.