- I. IP - Hostname Mapping
- 1. Using IP Address
- 2. Using Hostname
- 3. Mapping Between IP and Hostname
- (1) Windows
- (2) Linux (CentOS)
- 4. Hostname
- (1) Display Hostname
- (2) Modify Hostname
- II. Data Visutalization
- We can access a network resource in two manners - using IP or using hostname
- URL (Uniform Resource Locator) is used to access a certain resource on the Internet.
- URL has four parts: protocol + host + port + path
- Visit Hadoop WebUI：http://192.168.1.101:50070/dfshealth.html#tab-overview
- Visit Hadoop WebUI：http://master:50070/dfshealth.html#tab-overview
- hosts文件位置：C:WindowsSystem32driversetchosts
- three nodes: master, slave1, slave2
- on the master, we want to ping slave1 in two manners
- We can do this in two manners because we have set the mapping between ip and hostname
- Execute the command: vim /etc/hosts
- Execute the command: hostname
- Execute the command: hostnamectl set-hostname howard-master
- Let’s view the new hostname
- Now let’s reboot the master virtual machine
- on the slave1, we ping master virtual machine by ip address
- on the slave1, we ping master virtual machine by the new hostname
- on the slave1, we can ping master virtual machine by the old hostname
- Now I want to restore the hosname of the master virtual machine
- reboot the master virtual machine
- reconnect the master virtual machine
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Let’s visit wikipedia: https://www.wikipedia.org/
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Click English hyperlink
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Enter data visualiztion in the search box
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URL: https://en.wikipedia.org/wiki/Data_and_information_visualization
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Task 1. Use Excel to make the table for the number of articles in different languages and then generate a pie chart for the data.
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Task 2. Use Echarts to make a pie chart for the data.
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Task 3. Use matplotlib to make a pie chart for the data.
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