InfluxDB

InfluxDB版本：1.7.7

安装方法：解压运行即可

influx
influxd

修改配置文件influxdb.conf,打开用户验证，部分配置文件如下

[http]
  # Determines whether HTTP endpoint is enabled.
  enabled = true

  # Determines whether the Flux query endpoint is enabled.
  # flux-enabled = false

  # Determines whether the Flux query logging is enabled.
  # flux-log-enabled = false

  # The bind address used by the HTTP service.
  bind-address = ":8086"

  # Determines whether user authentication is enabled over HTTP/HTTPS.
  auth-enabled = true

  # The default realm sent back when issuing a basic auth challenge.
  # realm = "InfluxDB"

  # Determines whether HTTP request logging is enabled.
  log-enabled = true

  # Determines whether the HTTP write request logs should be suppressed when the log is enabled.
  # suppress-write-log = false

  # When HTTP request logging is enabled, this option specifies the path where
  # log entries should be written. If unspecified, the default is to write to stderr, which
  # intermingles HTTP logs with internal InfluxDB logging.
  #
  # If influxd is unable to access the specified path, it will log an error and fall back to writing
  # the request log to stderr.
  # access-log-path = ""

  # Filters which requests should be logged. Each filter is of the pattern NNN, NNX, or NXX where N is
  # a number and X is a wildcard for any number. To filter all 5xx responses, use the string 5xx.
  # If multiple filters are used, then only one has to match. The default is to have no filters which
  # will cause every request to be printed.
  # access-log-status-filters = []

  # Determines whether detailed write logging is enabled.
  write-tracing = false

  # Determines whether the pprof endpoint is enabled.  This endpoint is used for
  # troubleshooting and monitoring.
  pprof-enabled = false

  # Enables a pprof endpoint that binds to localhost:6060 immediately on startup.
  # This is only needed to debug startup issues.
  # debug-pprof-enabled = false

  # Determines whether HTTPS is enabled.
  https-enabled = false

  # The SSL certificate to use when HTTPS is enabled.
  # https-certificate = "/etc/ssl/influxdb.pem"

  # Use a separate private key location.
  # https-private-key = ""

  # The JWT auth shared secret to validate requests using JSON web tokens.
  # shared-secret = ""

  # The default chunk size for result sets that should be chunked.
  # max-row-limit = 0

  # The maximum number of HTTP connections that may be open at once.  New connections that
  # would exceed this limit are dropped.  Setting this value to 0 disables the limit.
  # max-connection-limit = 0

  # Enable http service over unix domain socket
  # unix-socket-enabled = false

  # The path of the unix domain socket.
  # bind-socket = "/var/run/influxdb.sock"

  # The maximum size of a client request body, in bytes. Setting this value to 0 disables the limit.
  # max-body-size = 25000000

  # The maximum number of writes processed concurrently.
  # Setting this to 0 disables the limit.
  # max-concurrent-write-limit = 0

  # The maximum number of writes queued for processing.
  # Setting this to 0 disables the limit.
  # max-enqueued-write-limit = 0

  # The maximum duration for a write to wait in the queue to be processed.
  # Setting this to 0 or setting max-concurrent-write-limit to 0 disables the limit.
  # enqueued-write-timeout = 0

把 http标签下的 auth-enabled 选项值改为 true

InfluxDB从1.2之后没有集成web客户端，所以可以使用其他工具进行访问，或者直接CMD

部分操作

展现所有用户

show users

创建用户

create user ccwith password 'cc'

赋权
```
GRANT ALL PRIVILEGES TO cc
```
修改用户(密码)
```
SET PASSWORD FOR cc= ‘cc‘
```
删除用户
```
DROP USER cc
```
撤消权限
```
REVOKE ALL  ON  mydb   FROM admin
```
查看权限
```
SHOW GRANTS FOR admin
```
删除表
```
drop measurement disk_free
```
删除数据库
```
drop database testdb
```

数据插入

insert disk_free,hostname=server01 value=442221834240   1435362189575692182
#1435362189575692182就是一个时间戳

显示Tag的Key
```
show tag keys
```
显示数据字段的Key
```
show field keys
```

可能存在的问题

Java环境的集成

时间数据的精度问题

数据的删除问题

数据太多时候的写入超时问题

设计准测

把你经常查询的字段作为tag
如果你要对其使用GROUP BY()，也要放在tag中
如果你要对其使用InfluxQL函数，则将其放到field中
如果你需要存储的值不是字符串，则需要放到field中，因为tag value只能是字符串
不要有太多的series

tags包含高度可变的信息，如UUID，哈希值和随机字符串，这将导致数据库中的大量measurement，通俗地说是高series cardinality。series cardinality高是许多数据库高内存使用的主要原因。