Nifi In short, it is a data pull 、 A system for data processing and data distribution .
Nifi Running requires JVM, need jdk,nifi 1.x The above needs jdk8 above ,0.x need jdk7 above .
This article is in Centos 7 Install in nifi-1.8.0-bin.tar.gz
Download address ：nifi.apache.org/download （xx.tar.gz yes Linux edition ,xx.zip yes Windows edition ）
User manual ：http://nifi.apache.org/docs.html

install

1. Download installation package

wget -b http://mirror.bit.edu.cn/apache/nifi/1.8.0/nifi-1.8.0-bin.tar.gz

2. Unzip the installation package

tar -zxf nifi-1.8.0-bin.tar.gz

3. modify nifi/conf Under the table of contents nifi.properties file
Modify host number and port number
nifi.web.http.host= Host number
nifi.web.http.port= Service port number [ Customize ]

# web properties #
nifi.web.war.directory=./lib
nifi.web.http.host=192.168.197.106   //  Change to your own host ip
nifi.web.http.port=8182			     //  Default 8080, Prevent port occupation , It can be modified to other ports 
nifi.web.http.network.interface.default=
nifi.web.https.host=
nifi.web.https.port=
nifi.web.https.network.interface.default=
nifi.web.jetty.working.directory=./work/jetty
nifi.web.jetty.threads=200
nifi.web.max.header.size=16 KB
nifi.web.proxy.context.path=
nifi.web.proxy.host=

4. Service startup
Get into nifi/bin Catalog , function nifi.sh file , The front and rear operation commands are as follows

./nifi.sh run 	// The front desk operation 
./nifi.sh start // Background operation 

The following prompt appears: the service is started successfully ,

Java home: /opt/soft/jdk180
NiFi home: /opt/soft/nifi-1.8.0

Bootstrap Config File: /opt/soft/nifi-1.8.0/conf/bootstrap.conf

see nifi Start state

./nifi.sh stauts
-----------------------------------------------------------------------------------------------------------

Java home: /opt/soft/jdk180
NiFi home: /opt/soft/nifi-1.8.0

Bootstrap Config File: /opt/soft/nifi-1.8.0/conf/bootstrap.conf

2021-05-01 17:24:49,589 INFO [main] org.apache.nifi.bootstrap.Command Apache NiFi is currently running, listening to Bootstrap on port 43069, PID=2099

5. Service closing
If it's a foreground operation , direct Ctrl+C Exit Service .
If it's running in the background , Access to nifi/bin Catalog , Execute the following command

./nifi.sh stop

6.web UI
Service startup 1-5 Minutes later , Can open web see ,http:192.168.197.106:8182/nifi, As shown in the figure .

Use

File synchronization

Realization ： take /opt/act.log Synchronize file contents to /opt/data Empty directory , And keep the source file .
Processor required GetFile ( Read and delete files ) + PutFile（ Save the file ）

Drag and drop a... In the toolbar Processor Go to the canvas , Input ’local’, choice ’GetFile’ processor , Click on ADD Add to canvas , The same operation creates a ’PutFile’ processor .

To configure GetFile processor

1. Select processor , Right click selection “configure”,“settings” The admission “success”, Automatically terminate the relationship .

2.“properties” Attribute configuration .

• Input Directory： Enter the source directory
• File Filter： File filter
• Keep Source File： Do you want to keep the source file , Default false
• Recurse Subdirectories： Whether to pull the files in the subdirectory , Default true

After configuration , Click on ‘apply’ Save application .

To configure PutFile processor

1. Select processor , Right click selection “configure”, stay “settings” The admission “failure” and “success”.

2.“properties” Attribute configuration

• Directory： Target directory
• Conflict Resolution Strategy： Specify the operation after a file with the same name exists . Optional value ：replace Replace existing files ,fail Execution failure , Don't generate files ,ignore Ignore .
• Create Missing Directories： Specify whether the target directory does not exist or not to create a directory . Optional value ：true newly build ,false No new .
  After configuration , Click on ‘apply’ Save application .
  

Connecting the processor

1. Move the mouse to ’GetFile’ On , The following arrow appears , Click and drag to ’PutFile’ On .

2. To configure “Settings”, Set up name:demo1, Increase priority ,‘FirstInFirstOutPrioritizer’. Click on ’add’, Create connection .

3. Right click the canvas and select ’Start‘, Visible data flow .GetFile Read file output 7.36KB,PutFile Write files to the target directory ,7.36KB, Also visible in the target directory act.log file .