关于NoSQL的知识------Redis初学

冷不防 2022-01-11 07:37 283阅读 0赞

**本文主要以粘贴视频截图为主，如果同步老师教学的操作过程中遇到了什么问题，会特别说明如何解决的，比如主从复制失败的问题**

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**主从复制失败原因：（我是将daemonize后台设置为no之后，变好的）**  
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**为了解决占用终端窗口的情况，将其放在后台执行nohup &**

[root@oracle bin]# redis-server /usr/local/redis/etc/redis.conf 
    20597:S 19 Jun 08:21:19.502 * Increased maximum number of open files to 10032 (it was originally set to 1024).
                    _._                                                  
               _.-``__ ''-._                                             
          _.-``    `.  `_.  ''-._           Redis 3.0.3 (00000000/0) 64 bit
      .-`` .-```.  ```\/    _.,_ ''-._                                   
     (    '      ,       .-`  | `,    )     Running in standalone mode
     |`-._`-...-` __...-.``-._|'` _.-'|     Port: 6379
     |    `-._   `._    /     _.-'    |     PID: 20597
      `-._    `-._  `-./  _.-'    _.-'                                   
     |`-._`-._    `-.__.-'    _.-'_.-'|                                  
     |    `-._`-._        _.-'_.-'    |           http://redis.io        
      `-._    `-._`-.__.-'_.-'    _.-'                                   
     |`-._`-._    `-.__.-'    _.-'_.-'|                                  
     |    `-._`-._        _.-'_.-'    |                                  
      `-._    `-._`-.__.-'_.-'    _.-'                                   
          `-._    `-.__.-'    _.-'                                       
              `-._        _.-'                                           
                  `-.__.-'                                               
    
    20597:S 19 Jun 08:21:19.503 # Server started, Redis version 3.0.3
    20597:S 19 Jun 08:21:19.505 # WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.
    20597:S 19 Jun 08:21:19.505 # WARNING you have Transparent Huge Pages (THP) support enabled in your kernel. This will create latency and memory usage issues with Redis. To fix this issue run the command 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' as root, and add it to your /etc/rc.local in order to retain the setting after a reboot. Redis must be restarted after THP is disabled.
    20597:S 19 Jun 08:21:19.506 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
    20597:S 19 Jun 08:21:19.506 * DB loaded from disk: 0.000 seconds
    20597:S 19 Jun 08:21:19.506 * The server is now ready to accept connections on port 6379
    20597:S 19 Jun 08:21:20.504 * Connecting to MASTER 192.168.197.134:6379
    20597:S 19 Jun 08:21:20.505 * MASTER <-> SLAVE sync started
    20597:S 19 Jun 08:21:20.506 * Non blocking connect for SYNC fired the event.
    20597:S 19 Jun 08:21:20.507 * Master replied to PING, replication can continue...
    20597:S 19 Jun 08:21:20.508 * Partial resynchronization not possible (no cached master)
    20597:S 19 Jun 08:21:20.509 * Full resync from master: 7c3e55e9e540d32f8ffbd639dbb838dc32da788b:1
    20597:S 19 Jun 08:21:20.612 * MASTER <-> SLAVE sync: receiving 40 bytes from master
    20597:S 19 Jun 08:21:20.612 * MASTER <-> SLAVE sync: Flushing old data
    20597:S 19 Jun 08:21:20.612 * MASTER <-> SLAVE sync: Loading DB in memory
    20597:S 19 Jun 08:21:20.612 * MASTER <-> SLAVE sync: Finished with success
    ^C20597:signal-handler (1560958050) Received SIGINT scheduling shutdown...
    20597:S 19 Jun 08:27:30.510 # User requested shutdown...
    20597:S 19 Jun 08:27:30.510 * Saving the final RDB snapshot before exiting.
    20597:S 19 Jun 08:27:30.557 * DB saved on disk
    20597:S 19 Jun 08:27:30.557 # Redis is now ready to exit, bye bye...
    [root@oracle bin]# nohup redis-server /usr/local/redis/etc/redis.conf &
    [1] 20624
    [root@oracle bin]# nohup: ignoring input and appending output to `nohup.out'
    
    [root@oracle bin]#

**主从复制至此已经ok**

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[nosql]: https://img-blog.csdnimg.cn/20190619205058816.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjE5MzQ4OQ==,size_16,color_FFFFFF,t_70
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