Big data management technology--stepping pit records--nosql-ex02

1. Installation environment

1. Pay attention to the IP address when installing the operating system

   • The installation of the operating system is the same as the first time, and the IP addresses will be automatically assigned consecutively, so do not change the network configuration.

   • reference:

     VMware installation Centos7 ultra-detailed process (graphic): https://blog.csdn.net/babyxue/article/details/80970526

     Install and run MongoDB on Linux: https://blog.csdn.net/yzh_1346983557/article/details/81735755

2. change hostname

   • Check the hostname: hostnamectl

   • Permanently modify the hostname: hostnamectl set-hostname xxx

   • Restart to take effect: reboot

   • reference:

     View and modify CentOS7 host name https://blog.csdn.net/Frankltf/article/details/82976506

2. Experimental operation

1. Step 1.2 is operated under nosql01

2. Create directory before 1.1 step 2

   • mkdir -p /opt/servers/mongodb_demo/
   • mkdir -p /opt/software/
   • This directory is at the same level as root

3. When operating step 2 of 1.1, do not copy when executing the change permission command. In the document, some symbols are wrong, try to type them by hand.

   • Note: Minus sign '-', colon ':' , space ' ', underscore '_'

   • Make sure all file permissions in /opt/servers/mongodb_demo are user_mongo

   • View permission command: ll

   • Command explanation:

     chown -R username: group name./ and chown usage introduction: https://blog.csdn.net/jinpengncu/article/details/77879844?ops_request_misc=%257B%2522request%255Fid%2522%253A%25221638665512167803665829 56%2522% 252C%2522scm%2522%253A%252220140713.130102334…%2522%257D&request_id=163866551216780366582956&biz_id=0&utm_medium=distribute.pc_search_result.none-task-b log-2 all sobaiduend~default-2-77879844.first_rank_v2_pc_rank_v29&utm_term=chown%3A+%E6%97 _% A0 %E6%95%88%E7%9A%84%E7%94%A8%E6%88%B7%3A+%22%E2%80%93R%22%0A++++++++++++ ++++++++++++++&spm=1018.2226.3001.4187

   • If there is still an error, try changing the permission to 777

     • reference:

       scp 文件 : /目录: Permission denied：https://blog.csdn.net/qq_36743482/article/details/78266308?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522163867195316780366577174%2522%252C%2522scm%2522%253A%252220140713.130102334…%2522%257D&request_id=163867195316780366577174&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2_blogsobaiduend~default-1-78266308.pc_v2_rank_blog_default&utm_term=scp%3A+Permission+denied&spm=1018.2226.3001.4450

4. Step 3 of step 1.2 can be directly operated in the folder under the GUI interface without executing the sudo command.

5. The sudo command may report "user_mongo is not in the sudoers file. This will be reported." error.

   • implement

     su root

     visado

   • turn up

     ##Allow root to run any commands anywhere

     root ALL=(ALL) ALL

   • Add in the next line: user_mongo ALL=(ALL) ALL

   • reference:

     About "The user is not in the sudoers file. This matter will be reported." Solution in Linux: https://blog.csdn.net/mall_lucy/article/details/104885178

6. Start MongoDB

   • nosql01 start

     ./mongod --replSet itcast \

     –dbpath=/opt/servers/mongodb_demo/replicaset/data/
     –logpath=/opt/servers/mongodb_demo/replicaset/logs/mongodb.log
     –port 27017 --bind_ip nosql01 --logappend

   • nosql02 start

     Change: –bind_ip nosql02

   • nosql03 start

     改：–bind_ip nosql03

   • Start a separate terminal for database operations

7. 2.3 Step 2 The process number is the number in the second column

   • reference:

     The specific meaning of ps -ef output https://blog.csdn.net/tanga842428/article/details/72874769?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522163867711716780271971456%2522%2 52C%2522scm%2522%253A %252220140713.130102334.pc%255Fblog.%2522%257D&request_id=163867711716780271971456&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2 blog first_rank _v2~rank_v29-1-72874769.pc_v2_rank_blog_default _& utm_term=ps±ef+%7C+grep+mongodb&spm=1018.2226. 3001.4450