CouchDB learn a

port

The port number	protocol	effect
5984	tcp	Vertebral standard ports for all cluster HTTP API requests
5986	tcp	For administrators to manage nodes and slices
4369	tcp	Erlang port mapping to daemon

basic configuration

couchdb Configuration

curlAddress: http://localhost:5984/_node/<name@host>/_config/couchdb/followed by the parameters.

• attachment_stream-buffer_size
  buffer pool size, the bigger the better read performance, but increase the response time of the write operation.
• database_dir
  database file address
• default_security
  default security level admin_local. everyone: anyone can read and write. admin_only: Only the admin can read and write. admin_local: Fragmented database can be read and written to anyone, but only fragments admin can be read and written.
• delayed_commits
  submitted late falseto ensure synchronization. truecan improve performance.
• file_compression
  file compression default snappy. none: No compression. snappy: Use Google's Snappy. deflate_N: Use zlib, N is the compression level from 1 (fastest, lowest compression ratio) to 9 (slowest speed, highest compression rate).
• fsync_options
  whether the file in the buffer zone refresh sync with the operating system to your hard drive. generally do not need to modify.fsync_options=[before_header,after_header,on_file_open]
• max_dbs_open
  while the maximum number of open database defaults to 100.
• os_process_timeout
  processing timeout default 5000ms
• uri_file
  This parameter specifies the file that contains the complete database used to access CouchDB instance URI. Default:/var/run/couchdb/couchdb.uri
• users_db_suffix
  user database suffix, default _users.
• util_driver_dir
  binary driver's position.
• uuid
  unique identifier of the server instance CouchDb
• view_index_dir
  position CouchDB view index file. Defaults:/var/lib/couchdb
• maintenance_mode
  two kinds of maintenance modes CouchDb node may be used true: the node in the cluster and does not respond to requests from other nodes /_up. endpoint will return 404 response nolb: /_upendpoint will return 404 response. false: normal response to the node 200.
• max_document_size
  maximum size of the document defaults to 4GB

operating

Node operation

See all the nodes

curl -u admin:adminpw -X GET http://localhost:5984/_membership
{
    "all_nodes":[   # 当前节点所知道的节点
        "[email protected]"],
    "cluster_nodes":[ #当前节点所连接的节点
        "[email protected]"],
}

Adding a node

curl -u admin:adminpw -X PUT http://localhost:5986/_nodes/[email protected] -d {}

To delete a node

#首先获取关于文档的revision
curl -u admin:adminpw -X GET "http://xxx.xxx.xxx.xxx:5986/_nodes/[email protected]"
{"_id":"[email protected]","_rev":"1-967a00dff5e02add41820138abb3284d"} 
#删除节点
curl -u admin:adminpw -X DELETE http://localhost:5986/_nodes/[email protected]?rev=1-967a00dff5e02add41820138abb3284d

Database operations

Create a database

Name of the database does not support uppercase characters, only supports [az], [0-9], as well as special characters:_ $ ( ) + - /

#创建一个数据库名字为db_name q=4说明该数据库分为4个部分(片) n=2说明数据库有一个副本。
curl -u admin:adminpw -X PUT http://localhost:5984/db_name?q=4&n=2

Delete Database

curl -u admin:adminpw -X DELETE http://localhost:5984/db_name