This post will show you how to install Redis 4.x onto Ubuntu 16.04
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Redis is a server-side (Lua based) schema-free open source (in Memory) NoSQL Key/Value store database that supports replication between servers. Redis has an Eventual Consistency replication between servers (over Immediate Consistency) between servers. Eventual consistency is evil in some peoples minds, eventual consistency does require different coding considerations (to guaranteed valid data but does offer speed benefits).
Redis is the worlds 9th most popular database behind Oracle, MySQL, Microsoft SQL Server, PostgreSQL, MongoDB, DB2, Microsoft Access, Cassandra. Redis is the most popular key-value store database. View the database trend chart here.
When to use Redis over MySQL or MongoDB
Here is a great guide on when to use Redis over MongoDB. Read my previous guide on building a scalable and secure MySQL Cluster.
Redis has a place where a relational database or NoSQL document stores do not (but it is more work). Read more here.
Redis is great in situations where caching or where memory is available on the server.
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grep MemTotal /proc/meminfo MemTotal: 4046404 kB grep MemFree /proc/meminfo MemFree: 3559244 kB |
Free Memory
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free -m total used free shared buff/cache available Mem: 3951 241 3213 9 496 3474 |
Installing Redis on Ubuntu
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sudo apt-get update sudo apt-get upgrade sudo apt-get install redis-server |
Backup the conf file
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cp /etc/redis/redis.conf /etc/redis/redis.conf.bak |
Open the redis cli (and test it).
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redis-cli 127.0.0.1:6379> ping PONG |
Show Redis info (from the redis-cli)
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redis-cli 127.0.0.1:6379> info # Server redis_version:3.0.6 redis_git_sha1:00000000 redis_git_dirty:0 redis_build_id:687a2a319020fa42 redis_mode:standalone os:Linux 4.4.0-116-generic x86_64 arch_bits:64 multiplexing_api:epoll gcc_version:5.3.1 process_id:17920 run_id:6b657bf624b1a91f7ba40c4c8a693024ca88d887 tcp_port:6379 uptime_in_seconds:34 uptime_in_days:0 hz:10 lru_clock:11819524 config_file:/etc/redis/redis.conf # Clients connected_clients:1 client_longest_output_list:0 client_biggest_input_buf:0 blocked_clients:0 # Memory used_memory:508784 used_memory_human:496.86K used_memory_rss:6905856 used_memory_peak:508784 used_memory_peak_human:496.86K used_memory_lua:36864 mem_fragmentation_ratio:13.57 mem_allocator:jemalloc-3.6.0 # Persistence loading:0 rdb_changes_since_last_save:0 rdb_bgsave_in_progress:0 rdb_last_save_time:1521768930 rdb_last_bgsave_status:ok rdb_last_bgsave_time_sec:-1 rdb_current_bgsave_time_sec:-1 aof_enabled:0 aof_rewrite_in_progress:0 aof_rewrite_scheduled:0 aof_last_rewrite_time_sec:-1 aof_current_rewrite_time_sec:-1 aof_last_bgrewrite_status:ok aof_last_write_status:ok # Stats total_connections_received:2 total_commands_processed:1 instantaneous_ops_per_sec:0 total_net_input_bytes:28 total_net_output_bytes:7 instantaneous_input_kbps:0.00 instantaneous_output_kbps:0.00 rejected_connections:0 sync_full:0 sync_partial_ok:0 sync_partial_err:0 expired_keys:0 evicted_keys:0 keyspace_hits:0 keyspace_misses:0 pubsub_channels:0 pubsub_patterns:0 latest_fork_usec:0 migrate_cached_sockets:0 # Replication role:master connected_slaves:0 master_repl_offset:0 repl_backlog_active:0 repl_backlog_size:1048576 repl_backlog_first_byte_offset:0 repl_backlog_histlen:0 # CPU used_cpu_sys:0.04 used_cpu_user:0.02 used_cpu_sys_children:0.00 used_cpu_user_children:0.00 # Cluster cluster_enabled:0 # Keyspace |
Benchmarking your Redis (quick)
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redis-benchmark -h 127.0.0.1 -p 6379 -t set,lpush -n 100000 -q SET: 90252.70 requests per second LPUSH: 130548.30 requests per second |
Benchmarking your Redis (slow)
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redis-benchmark -n 100000 ====== PING_INLINE ====== 100000 requests completed in 1.34 seconds 50 parallel clients 3 bytes payload keep alive: 1 97.65% <= 1 milliseconds 99.96% <= 4 milliseconds 100.00% <= 4 milliseconds 74794.31 requests per second ====== PING_BULK ====== 100000 requests completed in 1.02 seconds 50 parallel clients 3 bytes payload keep alive: 1 99.74% <= 1 milliseconds 100.00% <= 1 milliseconds 98231.83 requests per second ====== SET ====== 100000 requests completed in 0.93 seconds 50 parallel clients 3 bytes payload keep alive: 1 99.99% <= 1 milliseconds 100.00% <= 1 milliseconds 107066.38 requests per second ====== GET ====== 100000 requests completed in 1.03 seconds 50 parallel clients 3 bytes payload keep alive: 1 99.76% <= 1 milliseconds 99.95% <= 3 milliseconds 100.00% <= 4 milliseconds 96618.36 requests per second ====== INCR ====== 100000 requests completed in 0.87 seconds 50 parallel clients 3 bytes payload keep alive: 1 99.85% <= 1 milliseconds 100.00% <= 1 milliseconds 115340.26 requests per second ====== LPUSH ====== 100000 requests completed in 0.78 seconds 50 parallel clients 3 bytes payload keep alive: 1 99.89% <= 1 milliseconds 100.00% <= 1 milliseconds 128205.13 requests per second ====== LPOP ====== 100000 requests completed in 0.81 seconds 50 parallel clients 3 bytes payload keep alive: 1 99.61% <= 1 milliseconds 100.00% <= 1 milliseconds 124069.48 requests per second ====== SADD ====== 100000 requests completed in 1.38 seconds 50 parallel clients 3 bytes payload keep alive: 1 97.02% <= 1 milliseconds 99.97% <= 2 milliseconds 99.97% <= 3 milliseconds 100.00% <= 3 milliseconds 72516.32 requests per second ====== SPOP ====== 100000 requests completed in 1.40 seconds 50 parallel clients 3 bytes payload keep alive: 1 98.36% <= 1 milliseconds 99.85% <= 4 milliseconds 99.85% <= 5 milliseconds 99.92% <= 6 milliseconds 99.95% <= 10 milliseconds 100.00% <= 10 milliseconds 71326.68 requests per second ====== LPUSH (needed to benchmark LRANGE) ====== 100000 requests completed in 1.27 seconds 50 parallel clients 3 bytes payload keep alive: 1 95.40% <= 1 milliseconds 99.84% <= 2 milliseconds 99.85% <= 4 milliseconds 99.92% <= 5 milliseconds 99.98% <= 6 milliseconds 100.00% <= 6 milliseconds 78492.93 requests per second ====== LRANGE_100 (first 100 elements) ====== 100000 requests completed in 2.16 seconds 50 parallel clients 3 bytes payload keep alive: 1 95.95% <= 1 milliseconds 99.81% <= 2 milliseconds 99.82% <= 3 milliseconds 99.84% <= 4 milliseconds 99.90% <= 5 milliseconds 99.93% <= 7 milliseconds 99.94% <= 8 milliseconds 99.98% <= 10 milliseconds 100.00% <= 10 milliseconds 46382.19 requests per second ====== LRANGE_300 (first 300 elements) ====== 100000 requests completed in 5.49 seconds 50 parallel clients 3 bytes payload keep alive: 1 1.99% <= 1 milliseconds 91.78% <= 2 milliseconds 98.61% <= 3 milliseconds 99.65% <= 4 milliseconds 99.81% <= 5 milliseconds 99.90% <= 6 milliseconds 99.96% <= 9 milliseconds 99.96% <= 10 milliseconds 99.98% <= 11 milliseconds 100.00% <= 11 milliseconds 18221.57 requests per second ====== LRANGE_500 (first 450 elements) ====== 100000 requests completed in 8.79 seconds 50 parallel clients 3 bytes payload keep alive: 1 0.04% <= 1 milliseconds 60.33% <= 2 milliseconds 86.38% <= 3 milliseconds 97.11% <= 4 milliseconds 99.24% <= 5 milliseconds 99.54% <= 6 milliseconds 99.69% <= 7 milliseconds 99.80% <= 8 milliseconds 99.87% <= 9 milliseconds 99.90% <= 10 milliseconds 99.91% <= 11 milliseconds 99.92% <= 12 milliseconds 99.93% <= 13 milliseconds 99.98% <= 14 milliseconds 99.99% <= 15 milliseconds 100.00% <= 16 milliseconds 100.00% <= 16 milliseconds 11381.74 requests per second ====== LRANGE_600 (first 600 elements) ====== 100000 requests completed in 9.66 seconds 50 parallel clients 3 bytes payload keep alive: 1 0.01% <= 1 milliseconds 3.03% <= 2 milliseconds 94.78% <= 3 milliseconds 98.32% <= 4 milliseconds 98.90% <= 5 milliseconds 99.32% <= 6 milliseconds 99.60% <= 7 milliseconds 99.82% <= 8 milliseconds 99.92% <= 9 milliseconds 99.93% <= 10 milliseconds 99.94% <= 11 milliseconds 99.94% <= 12 milliseconds 99.95% <= 15 milliseconds 99.95% <= 16 milliseconds 99.95% <= 18 milliseconds 99.98% <= 19 milliseconds 99.99% <= 20 milliseconds 100.00% <= 20 milliseconds 10350.90 requests per second ====== MSET (10 keys) ====== 100000 requests completed in 1.22 seconds 50 parallel clients 3 bytes payload keep alive: 1 97.69% <= 1 milliseconds 99.95% <= 5 milliseconds 100.00% <= 6 milliseconds 82101.80 requests per second |
How to save and query a simple key/value integer
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127.0.0.1:6379> set testvalue 123 OK 127.0.0.1:6379> get testvalue "123" |
How to save and query a simple key/value string
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127.0.0.1:6379> set testvalue "Hello World" OK 127.0.0.1:6379> get testvalue "Hello World" |
Saving and querying multiple values
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127.0.0.1:6379> mset testvalue1 "a" testvalue2 "b" OK 127.0.0.1:6379> mget testvalue1 testvalue2 1) "a" 2) "b" |
Clear all
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127.0.0.1:6379> flushall OK |
Add to list (new items at the top)
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127.0.0.1:6379> lpush testlist "a" (integer) 1 127.0.0.1:6379> lpush testlist "b" (integer) 2 127.0.0.1:6379> lpush testlist "c" (integer) 3 127.0.0.1:6379> lrange testlist 0 -1 1) "c" 2) "b" 3) "a" |
Add to list (new items at the bottom)
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127.0.0.1:6379> rpush testlist "a" (integer) 1 127.0.0.1:6379> rpush testlist "b" (integer) 2 127.0.0.1:6379> rpush testlist "c" (integer) 3 127.0.0.1:6379> lrange testlist 0 -1 1) "a" 2) "b" 3) "c" |
Redis Documentation
Redis Crash Course Tutorial
More
5 uses of redis as a database.
Using Redis at scale at Twitter
Digital Ocean guide on Redis
Coming soon PHP access to Redis.
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v1.1 Oops, this was Redis 3 and not 4 (thanks, Patrik)
v1.0 Initial version
You are saying it is Redis 4, but even the doc you are writing it says v3.0.6, how is it Redis 4?