preface
Redis is a commonly used memory based key-value database, which is more advanced than Memcache and supports a variety of data structures, efficient and fast. Redis can easily solve the problem of high concurrency data access; Also very good for real-time monitoring signal processing.
The environment
Ubuntu 18.04
Install the Redis server side
~ sudo apt-get install redis-serverCopy the codeAfter the installation, the Redis server will start automatically. We check the Redis server program
Check the Redis server system process
~ ps -agx|grep redisCopy the code1 10382 10382? -1 Ssl 124 0:07 /usr/bin/redis-server 127.0.0.1:6379 2677 10618 10617 2677 PTS /0 10617 S+ 1000 0:00 grep –color=auto redis
Check the status of the Redis server by starting the command
~ netstat -nlt|grep 6379Copy the codeTCP 0 0 127.0.0.1:6379 0.0.0.0:* LISTEN tcp6 0 0: :1:6379 ::* LISTEN
Check the status of the Redis server by starting the command
~$ sudo /etc/init.d/redis-server statusCopy the codeLow redis – server. The service – the Advanced key value store – the Loaded: the Loaded (/ lib/systemd/system/redis – server. The service; enabled; vendor preset: enabled) Active: active (running) since Fri 2018-08-10 19:50:13 CST; 36min ago Docs: http://redis.io/documentation, man:redis-server(1) Main PID: 10382 (redis-server) Tasks: 4 (limit: 2294) CGroup: / system. Slice/redis – server service └ ─ 10382 / usr/bin/redis – server 127.0.0.1:6379
8月 10 19:50:12 Zhangkun-Virtual-machine Systemd [1]: Starting Advanced Key v… . 8月 10 19:50:13 Zhangkun-virtual-machine SystemD [1]: Redis-server. service: C… Ry 8月 10 19:50:13 Zhangkun-Virtual-machine Systemd [1]: Started Advanced Key-VA… e. Hint: Some lines were ellipsized, use -l to show in full.
Access Redis from the command line client
Installing the Redis server automatically installs the Redis command line client program along with it.
The client program accesses the Redis server by entering the redis-cli command on the local computer.
~ redis-cliCopy the code127.0.0.1:6379> help
redis-cli 4.0.9
To get help about Redis commands type:
“help @<group>” to get a list of commands in <group>
“help <command>” for help on <command>
“help <tab>” to get a list of possible help topics
“quit” to exit
To set redis-cli preferences:
“:set hints” enable online hints
“:set nohints” disable online hints
Set your preferences in ~/.redisclirc
127.0.0.1:6379> set key1 “hello”
OK
127.0.0.1:6379> get key1
“hello”
Basic Redis client command operation
Add a record key1
Redis 127.0.0.1:6379> set key1 "hello" OK # redis 127.0.0.1:6379> get key1 "hello"Copy the codeAdd a digital record
Redis 127.0.0.1:6379> INCR key2 (integer) 2 redis 127.0.0.1:6379> INCR key2 (integer) 3 # Print the record Redis 127.0.0.1:6379> get key2 "3"Copy the codeAdd a list record key3
127.0.0.1:6379> LPUSH key3 a (integer) 1 # Insert list from left redis 127.0.0.1:6379> LPUSH key3 b (integer) 2 # Insert list from right redis 127.0.0.1:6379> LPUSH key3 127.0.0.1:6379> RPUSH key3 c (integer) 3 # Print list records in left-to-right order redis 127.0.0.1:6379> LRANGE key3 0 3 1) "b" 2) "a" 3) "C"Copy the codeAdd a hash entry key4
Redis 127.0.0.1:6379> HSET key4 name "John Smith" (integer) 1 # Insert into hash table Redis 127.0.0.1:6379> HSET key4 email "[email protected]" (integer) 1 # Print the hash table, Redis 127.0.0.1:6379> HGET key4 name" John Smith" # redis 127.0.0.1:6379> HGETALL key4 1) "name" 2) "John Smith" 3) "email" 4) "[email protected]"Copy the codeAdd a hash table record key5
Redis 127.0.0.1:6379> HMSET key5 username antirez password P1pp0 age 3 OK Redis 127.0.0.1:6379> HMGET key5 username age 1) "antirez" 2) "3" # print complete hash table redis 127.0.0.1:6379> HGETALL key5 1) "username" 2) "antirez" 3) "password" 4) "P1pp0" 5) "age" 6) "3"Copy the codeDelete records
Redis 127.0.0.1:6379> keys * 1) "key2" 2) "key3" 3) "key4" 4) "key5" 5) "key1" # delete key1,key5 redis 127.0.0.1:6379> del key1 (integer) 1 redis 127.0.0.1:6379> del key5 (integer) 1 # Check all keys list redis 127.0.0.1:6379> keys * 1) "key2" 2) "key3" 3) "key4"Copy the codeModify the Redis configuration
Use the Redis access account
By default, you do not need a password to access the Redis server. To increase security, you need to set a password to access the Redis server. Set the access password to redisredis.
Open the Redis server configuration file redis.conf using vi
Requirepass requirepass redisredis ~ sudo vi /etc/redis/redis.confCopy the codeLet Redis server be accessed remotely
By default, Redis server does not allow remote access, only native access, so we need to set up remote access enabled.
Open the Redis server configuration file redis.conf using vi
~ sudo vi /etc/redis/redis.conf # 解 决 bind #bind 127.0.0.1Copy the codeAfter modification, restart the Redis server.
~ sudo /etc/init.d/redis-server restart
Stopping redis-server: redis-server.
Starting redis-server: redis-server.Copy the codeLog in to Redis server without password
~ redis-cli
redis 127.0.0.1:6379> keys *
(error) ERR operation not permittedCopy the codeFound able to log in, but unable to execute command.
Log in to the Redis server and enter your password
~ redis-cli -a redisredis
redis 127.0.0.1:6379> keys *
1) "key2"
2) "key3"
3) "key4"Copy the codeAfter landing, everything was fine.
We check the network listening port of Redis
Check the port occupied by Redis server
~ netstat - NLT) | grep TCP 6379 0 0 0.0.0.0:6379 0.0.0.0: * LISTENCopy the codeWe see that the network listener has changed from 127.0.0.1:3306 to 0 0.0.0.0:3306, indicating that Redis has allowed remote login access.
We access the Redis server remotely on another Linux
~ redis-cli -a redisredis -h 192.168.1.199
redis 192.168.1.199:6379> keys *
1) "key2"
2) "key3"
3) "key4"Copy the codeRemote access normal. Through the above operations, we have completed the installation of the Redis database server in Linux Ubuntu.