linux redis 内存设置,linux下redis的安装配置测试

一. 安装,不用./configure,不用make install就编译一下就可邓

# useradd redis

# passwd redis

# su - redis

$ tar zxvf redis-2.0.4.tar.gz

$ cd redis-2.0.4

$ make

二.配置

$ vim redis.conf

主要配置的参数

pidfile /var/run/redis.pid  进程号

port 6379  端口号

loglevel verbose  打印日志级别，分别有debug(所有日志信息),verbose(有用的日志信息),notice(高于

verbose级别),warning(只输出重要紧急信息)

# logfile stdout  表示直接输出

logfile /home/redis/redis-2.0.4/logs/redis.log 表示把日志输入到此文件中

####################################################

把数据写入磁盘的时间配置(以下是默认的情况)

save 900 1  至少一个值变化的情况下，间隔900秒从内存写入磁盘

save 300 10 至少10个值变化的情况下，间隔300秒从内存写入磁盘

save 60 10000

#   after 900 sec (15 min) if at least 1 key changed

#   after 300 sec (5 min) if at least 10 keys changed

#   after 60 sec if at least 10000 keys changed

rdbcompression yes  是否采用压缩存储，如果不想耗CPU，刚取no

dbfilename dump.rdb  备份数据的文件名与位置

####################################################

进行限制的配置

# maxclients 128  最大客户端连接数，默认128个

# maxmemory 最大占用内存大小，单位为bytes 1kb=1024bytes  1mb => 1024*1024 bytes

maxmemory 633572

###################################################

自带VM(虚拟内存)配置

redis支持采用VM技术，以达到当数据超过设置的可使用的物理内存的时候能够正常运行。当数据超过物理内

存的时候，把一部分数据写入磁盘中的一块空间来代替物理内存

vm-enabled no  默认不采用

# vm-enabled yes

vm-swap-file /tmp/redis.swap  如果采用VM技术，设置磁盘上的物理空间

vm-max-memory 0  虚拟内存的大小，一般设为物理内存的60~80%

vm-pages 134217728 采用内存页的方式存储，在磁盘上的每8页要消耗物理内存的1byte

vm-page-size 32 设置采用的page的数量，根据自己数据库的大小决定page的数量

三. 启动

$ nohub ./redis-server redis.conf &

$ ps aux | grep redis

root      3239  0.0  0.3   4908  1236 pts/0    S    10:07   0:00 su - redis

redis     3240  0.0  0.3   4532  1460 pts/0    S    10:07   0:02 -bash

redis     3510  0.5  0.2   2692  1148 pts/0    S    10:54   0:00 ./redis-server redis.conf

redis     3511  0.0  0.2   4252   940 pts/0    R+   10:54   0:00 ps aux

redis     3512  0.0  0.1   3912   676 pts/0    R+   10:54   0:00 grep redis

$ tail -f /home/redis/redis-2.0.4/logs/redis.log

[3507] 20 Feb 10:54:22 * Server started, Redis version 2.0.4

[3507] 20 Feb 10:54:22 # 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.

[3507] 20 Feb 10:54:22 * DB loaded from disk: 0 seconds

[3507] 20 Feb 10:54:22 * The server is now ready to accept connections on port 6379

[3507] 20 Feb 10:54:22 - DB 0: 4 keys (0 volatile) in 4 slots HT.

[3507] 20 Feb 10:54:22 - 0 clients connected (0 slaves), 533980 bytes in use

[3507] 20 Feb 10:54:27 - DB 0: 4 keys (0 volatile) in 4 slots HT.

[3507] 20 Feb 10:54:27 - 0 clients connected (0 slaves), 533980 bytes in use

[3510] 20 Feb 10:54:32 * Server started, Redis version 2.0.4

此处报了错，是因为内存太小，使用比较紧张，需要修改内核参数。首先切换到root用户下

echo 1 > /proc/sys/vm/overcommit_memory

$ pkill redis

$ nohub ./redis-server redis.conf &

$ tail -f /home/redis/redis-2.0.4/logs/redis.log

[3565] 20 Feb 10:58:50 * Server started, Redis version 2.0.4

[3565] 20 Feb 10:58:50 * DB loaded from disk: 0 seconds

[3565] 20 Feb 10:58:50 * The server is now ready to accept connections on port 6379

[3565] 20 Feb 10:58:51 - DB 0: 4 keys (0 volatile) in 4 slots HT.

[3565] 20 Feb 10:58:51 - 0 clients connected (0 slaves), 533980 bytes in use

问题解决！

四. 测试

redis自带了测试工具redis-benchmark

[redis@localhost redis-2.0.4]$ ./redis-benchmark  --help  有自己的参数

Wrong option '--help' or option argument missing

Usage: redis-benchmark [-h ] [-p ] [-c ] [-n [-k ]

-h Server hostname (default 127.0.0.1)

-p Server port (default 6379)

-c Number of parallel connections (default 50)

-n Total number of requests (default 10000)

-d Data size of SET/GET value in bytes (default 2)

-k 1=keep alive 0=reconnect (default 1)

-r Use random keys for SET/GET/INCR, random values for SADD

Using this option the benchmark will get/set keys

in the form mykey_rand000000012456 instead of constant

keys, the argument determines the max

number of values for the random number. For instance

if set to 10 only rand000000000000 - rand000000000009

range will be allowed.

-q                 Quiet. Just show query/sec values

-l                 Loop. Run the tests forever

-I                 Idle mode. Just open N idle connections and wait.

-D                 Debug mode. more verbose.

[redis@localhost redis-2.0.4]$ ./redis-benchmark

====== PING ======

10000 requests completed in 1.69 seconds

50 parallel clients

3 bytes payload

keep alive: 1

0.04% <= 0 milliseconds

0.05% <= 1 milliseconds

0.09% <= 2 milliseconds

0.14% <= 3 milliseconds

0.20% <= 4 milliseconds

0.25% <= 5 milliseconds

0.31% <= 6 milliseconds

2.04% <= 7 milliseconds

69.22% <= 8 milliseconds

97.44% <= 9 milliseconds

99.82% <= 10 milliseconds

100.00% <= 11 milliseconds

5931.20 requests per second

通过redis-cli命令实际操作一下，比如：

redis-cli set foo bar

OK

redis-cli get foo

bar

在设置键对应的值的时候，按照协议的规定是要提供数据大小这个参数的，上面的redis-cli命令之所以没有

提供这个参数是因为redis-cli本身进行了封装。

可以通过telnet来验证一点：

$ telnet 127.0.0.1 6379

Trying 127.0.0.1...

Connected to localhost.localdomain (127.0.0.1).

Escape character is '^]'.

set foo 5   设长度为5

abcdef    此处输入6个字符

+OK

get foo

$5

abcde     得到的长度为5个字符

^]

telnet> q

Connection closed.