Data Source
========================
Service-Center support multiple DB configurations. Configure app.yaml according to your needs.

::

   registry:
     # buildin, etcd, embedded_etcd, mongo
     kind: etcd
     # registry cache, if this option value set 0, service center can run
     # in lower memory but no longer push the events to client.
     cache:
       mode: 1
       # the cache will be clear after X, if not set cache will be never clear
       ttl:
     # enabled if registry.kind equal to etcd or embedded_etcd

.. list-table::
  :widths: 15 20 5 10
  :header-rows: 1

  * - field
    - description
    - required
    - value
  * - registry.kind
    - database type (etcd or mongo)
    - yes
    - etcd / embedded_etcd /mongo
  * - registry.cache.mode
    - open cache (1 is on, 0 is off)
    - yes
    - 1 / 0
  * - registry.cache.ttl
    - cache timeout (if not set cache will be never clear)
    - no
    - an integer time, like 30s/20m/10h

Etcd
----------------------------------------
Download the etcd according to your own
environment. `Etcd Installation package address`_.

Configure app.yaml according to your needs.

::

     etcd:
       # the interval of etcd health check, aggregation conflict check and sync loop
       autoSyncInterval: 30s
       compact:
         # indicate how many revision you want to keep in etcd
         indexDelta: 100
         interval: 12h
       cluster:
         # if registry_plugin equals to 'embedded_etcd', then
         # name: sc-0
         # managerEndpoints: http://127.0.0.1:2380"
         # endpoints: sc-0=http://127.0.0.1:2380
         # if registry_plugin equals to 'etcd', then
         # endpoints: 127.0.0.1:2379
         endpoints: 127.0.0.1:2379
       # the timeout for failing to establish a connection
       connect:
         timeout: 10s
       # the timeout for failing to read response of registry
       request:
         timeout: 30s

.. list-table::
  :widths: 15 20 5 10
  :header-rows: 1

  * - field
    - description
    - required
    - value
  * - registry.etcd.autoSyncInterval
    - synchronization interval
    - yes
    - an integer time, like 30s/20m/10h
  * - registry.etcd.compact.indexDelta
    - version retained in etcd
    - yes
    - a 64 bit integer, like 100
  * - registry.etcd.compact.interval
    - compression interval
    - yes
    - an integer time, like 30s/20m/10h
  * - registry.etcd.cluster.endpoints
    - endpoints address
    - yes
    - string, like 127.0.0.1:2379
  * - registry.etcd.connect.timeout
    - the timeout for establishing a connection
    - yes
    - an integer time, like 30s/20m/10h
  * - registry.etcd.request.timeout
    - request timeout
    - yes
    - an integer time, like 30s/20m/10h

**Download the installation package according to the environment information**

1. Download etcd package.
2. Unzip, modify the configuration and start etcd.
3. Download the latest release from `ServiceComb Website`_.
4. Decompress, modify /conf/app.yaml.
5. Execute the start script to run service center


Mongodb
----------------------------------------

Download the mongodb according to your own
environment. `Mongodb Installation package address`_.

Configure app.yaml according to your needs.

::

     mongo:
       cluster:
         uri: mongodb://localhost:27017
         sslEnabled: false
         rootCAFile: /opt/ssl/ca.pem
         verifyPeer: false
         certFile: /opt/ssl/client.crt
         keyFile: /opt/ssl/client.key

.. list-table::
  :widths: 15 20 5 10
  :header-rows: 1

  * - field
    - description
    - required
    - value
  * - registry.mongo.cluster.uri
    - mongodb server address
    - yes
    - string, like mongodb://localhost:27017
  * - registry.mongo.cluster.sslEnabled
    - ssl enabled / not enabled
    - yes
    - false / true
  * - registry.mongo.cluster.rootCAFile
    - if sslEnabled equal true, should set CA file path
    - yes
    - string, like /opt/ssl/ca.pem
  * - registry.mongo.cluster.verifyPeer
    - insecure skip verify
    - yes
    - false / true
  * - registry.mongo.cluster.certFile
    - the cert file path need to be set according to the configuration of mongodb server
    - no
    - string, like /opt/ssl/client.crt
  * - registry.mongo.cluster.keyFile
    - the key file path need to be set according to the configuration of mongodb server
    - no
    - string, like /opt/ssl/client.key


**Download the installation package according to the environment information**

1. Download mongodb package.
2. Unzip, modify the configuration and start mongodb. `Mongodb configure ssl`_.
3. Download the latest release from `ServiceComb Website`_.
4. Decompress, modify /conf/app.yaml.
5. Execute the start script to run service center

.. _Etcd Installation package address: https://github.com/etcd-io/etcd/releases
.. _Mongodb Installation package address: https://www.mongodb.com/try/download/community
.. _Mongodb configure ssl: https://docs.mongodb.com/v4.0/tutorial/configure-ssl/
.. _ServiceComb Website: http://servicecomb.apache.org/release/