A plugin for installing and managing Redis, an advanced persistent key-value store. Currently this, like Moonshine's Rails recipes in general, is Ubuntu/Debian-specific.

• script/plugin install git://github.com/railsmachine/moonshine_redis.git
• Configure settings if needed. You may specify:
  • Package architecture. Default is amd64.
  • Version. Default is 2.4.17, but should work fine with 2.6+
  • enable_on_boot in case you want to disable starting the service on boot at system-level (useful if you want god to do it instead, for instance). Default is true.
  • ruby_client to optionally install the given version of the redis client library as a rubygem. This also accepts latest as a value, which will install updated versions if available each time your Moonshine manifest is applied. Default is none.
  • max_fd to adjust the maximum number of open file descriptors allotted to Redis by the shell that launches it. Servers with a high number of connections may need to specify a value here. A typical default is 1024. Versions of Redis released prior to this commit have a compiled-in upper limit of 10240.

For example, in moonshine.yml:

:redis:
  :version: 2.0.1-2
  :arch: i386
  :ruby_client: 1.0.7
  :enable_on_boot: false
  :max_fd: 4096

• Include the recipe in your Moonshine manifest

  recipe :redis

• :version: 2.4.17
• :restart_on_change: true # should redis restart after its config files change?
• :port: 6379
• :bind: 0.0.0.0
• :loglevel: notice
• :databases: 16 # Number of databases to run with. 16 should be enough for almost all uses.
• :saves: # how often to write the rdb file based on number of changes per time period (ie: 1 change, save every 900 seconds)
  • • 'save 900 1'
  • • 'save 300 10'
  • • 'save 60 10000'
• :rdbcompression: false
• :slaves: # an array of 'slaveof IP PORT', defaults to none.
• :masterauth: # defaults to no authentication. If you want a password, :masterauth: should be set to that password.
• :requirepass: false
• :maxclients: 0
• :maxmemory: 0
• :appendonly: false
• :appendfsync: everysec # this is the default for redis and the recommended setting.
• :vm_enabled: false # warning: virtual memory has been removed in 2.6 and won't be added to the config file if you have version set > 2.4
• :vm_max_memory: # defaults to unset
• :vm_page_size: # defaults to unset
• :vm_pages: # defaults to unset
• :vm_max_threads: # defaults to unset

We highly recommend setting the sysctl setting vm.overcommit_memory. Thankfully, moonshine_systcl can help with this. Just install the plugin and then add the following the config/moonshine.yml:

:sysctl:
  vm.overcommit_memory: 1

You'll also need to add recipe :sysctl to your manifest.

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