Redis installation Configuration

Redis installation Configuration

This section describes how to install and configure redis and start redis as a service.

1. download the latest version of the redis-3.0.7 to the unzip-zxvf redis-3.0.7.tar.gz above the redis-3.0.7 is the directory of the redis unzip into the redis-3.0.7 directory, then enter the command: make generates redis-cli, redis-server, and other files in the src directory of redis,

Parameter introduction:

Redis-server: daemon Startup Program of the Redis server

Redis-cli: Redis command line operation tool. You can also use telnet to operate based on its plain text protocol.

Redis-benchmark: Redis performance testing tool to test Redis's read/write performance in the current system

Redis-check-aof: data repair

Redis-check-dump: check the export tool

Go to the src directory and run the command./redis-server. Then, redis will install the default configuration to start redis on the front-end.

If you press Ctrl + c, the redis service is terminated.

Therefore, we need to configure redis as the background Startup Mode and start it in the service mode. 3. configure redis as a service to start redis. copy the conf file to the/etc/redis/directory and rename it to 6379. conf cp/home/lewis/dev_soft/redis-3.0.7/redis. conf/etc/apsaradb for redis/6379. conf and modify 6379. conf configuration: vi/etc/redis/6379. conf changes daemonize from the original no to yes, indicating that pidfile is started from the original/var/run/redis in the background. modify pid to/var/run/redis_62.16.pid to configure the redis Log Path: copy the redis STARTUP script to the self-starting directory/etc/init. d directory and rename it to redisdcp/home/lewis/dev_soft/redis-3.0.7/utils/redis_init_script/etc/init. d/redisd modify redisd, vi/etc/init. d/redisd log on to the redis service using the redis-cli client as follows and find that redis services can be used. 4. redis configuration. simple definition of conf:

1. Redis does not run as a daemon by default. You can modify this configuration item and use yes to enable the daemon.
Daemonize no
2. When Redis runs as a daemon, Redis writes the pid to the/var/run/redis. pid file by default, which can be specified through pidfile
Pidfile/var/run/redis. pid
3. specify the Redis listening port. The default port is 6379. The author explains in his blog why 6379 is used as the default port, because 6379 corresponds to the MERZ number on the mobile phone key, MERZ is taken from the name of Alessia Merz, an Italian singer.
Port 6379
4. Bound host address
# Bind 127.0.0.1
5. When the client is idle for a long time, the connection is closed. If it is set to 0, the function is disabled, in seconds.
Timeout 0
6. Specify the log record level. Redis supports four levels in total: debug, verbose, notice, and warning. The default value is verbose.
Loglevel verbose
7. log Record mode. The default value is standard output. If Redis is configured to run in daemon mode and the log record mode is set to standard output, the log will be sent to/dev/null.
Logfile stdout
8. Set the number of databases. The default database is 0. You can use the SELECT <dbid> command to specify the database id for the connection.
Databases 16
9. specify how many update operations are performed within the specified time period to synchronize data to the data file. Multiple conditions can be used together.
Save <seconds> <changes>
The default configuration file of Redis provides three conditions:
Save 900 1
Save 300 10
Save 60 10000
1 change in 900 seconds (15 minutes), 10 Changes in 300 seconds (5 minutes), and 10000 changes in 60 seconds.
10. Specify whether to compress data when stored in the local database. The default value is yes. Redis uses LZF to compress data. To save CPU time, disable this option, but this will cause huge changes in database files.
Rdbcompression yes
11. Specify the local database file name. The default value is dump. rdb.
Dbfilename dump. rdb
12. Specify the local database storage directory
Dir./redisdata
13. Set the IP address and port of the master service when the local machine is slav service. When Redis is started, it will automatically synchronize data from the master.
Slaveof <masterip> <masterport>
14. When password protection is set for the master service, the slav service connects to the master password
Masterauth <master-password>
15. Set the Redis connection password. If the connection password is configured, the client must use the AUTH <password> command to provide the password when connecting to Redis. The password is disabled by default.
Requirepass foobared
16. Set the maximum number of client connections at the same time. The default value is 10000. The number of client connections that can be opened at the same time in Redis is the maximum number of file descriptors that can be opened by the Redis process. If maxclients 0 is set, no restrictions are imposed. When the number of client connections reaches the limit, Redis closes the new connection and returns the max number of clients reached error message to the client.
Maxclients 10000
17. specify the maximum memory limit of apsaradb for Redis. Redis loads data into the memory at startup. After the maximum memory is reached, Redis first tries to clear the expired or expiring Key, after this method is processed, it still reaches the maximum memory setting, and no write operation can be performed, but the read operation can still be performed. Redis's new vm mechanism stores keys in memory, and values in the swap Area
Maxmemory <bytes>
18. specify whether to record logs after each update operation. Redis asynchronously writes data to the disk by default. If this parameter is not enabled, data may be lost for a period of time during power failure. Because redis synchronizes data files according to the save conditions above, some data will only exist in the memory for a period of time. The default value is no. This backup is very time-consuming and cannot be performed frequently. If a fault occurs, such as power limit or power limit, the backup will cause a wide range of data loss. Therefore, redis provides another more efficient method for database backup and disaster recovery. After the append only mode is enabled, redis will append each write operation request received to appendonly. in the aof file, when redis is restarted, the previous state will be restored from the file. However, this will cause the appendonly. aof file to be too large, so redis also supports the BGREWRITEAOF command to reorganize appendonly. aof
Appendonly yes
19. Specify the Update log file name. The default value is appendonly. aof.
Appendfilename appendonly. aof
20. Specify the log update conditions. There are three optional values:
Appendfsync no: Indicates synchronizing data cached by the operating system to the disk (FAST)
Appendfsync always: indicates that after each update operation, you can manually call fsync () to write data to the disk (slow and secure)
Appendfsync everysec: Indicates synchronization once per second (compromise, default)
21. specifies whether to enable the virtual memory mechanism. The default value is no. For a brief introduction, the VM mechanism stores data on pages, and Redis stores cold data on the disk, that is, pages with less traffic, multiple accessed pages are automatically swapped out from the disk to the memory (I will carefully analyze the VM mechanism of Redis in the following article)
Vm-enabled no
22. virtual memory file path. The default value is/tmp/redis. swap. It cannot be shared by multiple Redis instances.
Vm-swap-file/tmp/redis. swap
23. store all data greater than vm-max-memory into the virtual memory. No matter how small the vm-max-memory settings are, all index data is stored in the memory (Redis's index data is keys ), that is to say, when vm-max-memory is set to 0, all values exist on the disk. The default value is 0.
Vm-max-memory 0
24. redis swap files are divided into many pages. One object can be stored on multiple pages, but one page cannot be shared by multiple objects, vm-page-size is set based on the size of stored data. The author suggests that if many small objects are stored, the page size should be set to 32 or 64 bytes. If a large object is stored, you can use a larger page. If you are not sure, use the default value.
Vm-page-size 32
25. set the number of pages in the swap file. Because the page table (a bitmap indicating that the page is idle or used) is in the memory, every 8 pages on the disk consumes 1 byte of memory.
Vm-pages 134217728
26. set the number of threads used to access the swap file. It is best not to exceed the number of server cores. If it is set to 0, all operations on the swap file are serial, which may cause a long delay. The default value is 4.
Vm-max-threads 4
27. Set whether to combine a small package into a package for sending when responding to the client. The function is enabled by default.
Glueoutputbuf yes
28. When a specified number or maximum element exceeds a critical value, a special hash algorithm is used.
Hash-max-zipmap-entries 64
Hash-max-zipmap-value 512
29. Specify whether to enable or disable hash resetting. The default setting is enable (this will be detailed later when we introduce the hash algorithm of Redis)
Activerehashing yes
30. Specify other configuration files. You can use the same configuration file between multiple Redis instances on the same host, and each instance has its own specific configuration file.
Include/path/to/local. conf

You may also like the following articles about Redis. For details, refer:

Install and test Redis in Ubuntu 14.04

Basic configuration of Redis master-slave Replication

Redis cluster details

Install Redis in Ubuntu 12.10 (graphic explanation) + Jedis to connect to Redis

Redis series-installation, deployment, and maintenance

Install Redis in CentOS 6.3

Learning notes on Redis installation and deployment

Redis. conf

Redis details: click here
Redis: click here

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