Redis服务搭建及操作
Redis 是一个高性能的key-value数据库。 redis的出现,很大程度补偿了memcached这类keyvalue存储的不足,在部分场合可以对关系数据库起到很好的补充作用。它提供了Python,Ruby,Erlang,PHP客户端,使用很方便。
以下是安装测试步骤:
1,redis安装:
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[root@localhost ~]# cd /usr/local/src/
[root@localhost src]# wget http://redis.googlecode.com/files/redis-2.2.12.tar.gz
[root@localhost src]# tar zxf redis-2.2.12.tar.gz
[root@localhost src]# cd redis-2.2.12
[root@localhost redis-2.2.12]# make PREFIX=/usr/local/redis install
2,配置redis:
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[root@localhost redis-2.2.12]# mkdir -p /usr/local/redis/etc
[root@localhost redis-2.2.12]# mkdir -p /usr/local/redis/var
[root@localhost redis-2.2.12]# cd /usr/local/redis/etc
[root@localhost etc]# vi redis.conf(重新建立conf文件,需要复制下面的配置)
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daemonize yes
pidfile /usr/local/redis/redis.pid
port 6379
bind 127.0.0.1
timeout 300
loglevel verbose
logfile stdout
databases 16
save 900 1
save 300 10
save 60 10000
rdbcompression yes
dbfilename dump.rdb
dir /usr/local/redis/var/
slave-serve-stale-data yes
maxclients 12800
appendonly no
appendfsync everysec
no-appendfsync-on-rewrite no
slowlog-log-slower-than 10000
slowlog-max-len 1024
vm-enabled no
vm-swap-file /tmp/redis.swap
vm-max-memory 0
vm-page-size 32
vm-pages 134217728
vm-max-threads 4
hash-max-zipmap-entries 512
hash-max-zipmap-value 64
list-max-ziplist-entries 512
list-max-ziplist-value 64
set-max-intset-entries 512
activerehashing yes
3,启动关闭redis:
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[root@localhost ~]# /usr/local/redis/bin/redis-server /usr/local/redis/etc/redis.conf
[root@localhost ~]# ps -ef|grep redis
root 3891 1 0 18:11 ? 00:00:00 /usr/local/redis/bin/redis-server /usr/local/redis/etc/redis.conf
[root@localhost redis-2.2.12]# /usr/local/redis/bin/redis-cli -h 127.0.0.1 -p 6379 shutdown
如果配置使用默认的127.0.0.1和6379端口,可执行命令时可省略以上参数。
4,测试redis:
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[root@localhost ~]# telnet 127.0.0.1 6379
Trying 127.0.0.1...
Connected to localhost (127.0.0.1).
Escape character is '^]'.
^]
telnet> quit
Connection closed.
5,/usr/local/redis/bin目录下执行文件功能说明:
redis-server:Redis服务器的daemon启动程序
redis-cli:Redis命令行操作工具。当然,你也可以用telnet根据其纯文本协议来操作
redis-benchmark:Redis性能测试工具,测试Redis在你的系统及你的配置下的读写性能
--------------------------满意的分割线-----------------------------------
实例:
1)登陆,输入数据:
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[root@localhost ~]# /usr/local/redis/bin/redis-cli -h 127.0.0.1 -p 6379
redis 127.0.0.1:6379> set name csdn
OK
redis 127.0.0.1:6379> get name
"<span style="font-family: simsun; ">csdn</span>"
redis 127.0.0.1:6379> quit
2)查看redis统计信息:
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[root@localhost ~]# /usr/local/redis/bin/redis-cli -h 127.0.0.1 -p 6379 info
3)测试性能:
向redis服务器发送10个请求,每个请求附带50个并发客户端,-n 接请求数,-c 接并发数
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[root@localhost ~]# /usr/local/redis/bin/redis-benchmark -h 127.0.0.1 -p 6379 -n 10 -c 50
自参文档
redis源码安装:redis-3.2.9.tar.gz
下载:wget http://source.goyun.org:8000/source/Redis/redis-3.2.9.tar.gz
解压:tar -vxf redis-3.2.9.tar.gz
编译安装:cd redis-3.2.9
# make MALLOC=jemalloc
#make PREFIX=/home/application/redis-3.2.9 install
cd /home/application/
#ln -s redis-3.2.9 /home/application/redis
配置环境变量:
#vim /etc/profile
最后一行添加:export PATH=/home/application/redis/bin/:$PATH
#./etc/profile
# which redis-server
/home/application/redis/bin/redis-server 表示生效
规范配置文件;
#mkdir /etc/redis
cp /home/application/redis-3.2.9/redis.conf /etc/redis
开机启动:
redis-server /etc/redis/redis.conf &
启动时发现有vm.overcommit_memory = 1(说明内存低) 后要将这条添加到vim /etc/sysctl.conf的配置文件里面
或者直接执行sysctl vm.overcommit_memory=1 临时立即生效
首先将redis关掉 :killall redis-server
然后sysctl vm.overcommit_memory=1 当前生效
这时重启:redis-server /etc/redis/redis.conf
#lsof -i :6379 检查服务有没有起来
redis的正确关闭方法:redis-cli shutdown
redis启动服务及客户端测试命令
客户端命令:redis-cli
redis-cli -h 192.168.1.158 -p 6379
也可以用telnet去连接
Redis 3.2.9版本启动时出现警告的解决办法:
错误类型:7283:M 12 Mar 12:13:33.749 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
解决方法1: 临时设置生效: sysctl -w net.core.somaxconn = 1024
方法2: 永久生效: 修改/etc/sysctl.conf文件,增加一行
net.core.somaxconn= 1024
然后执行命令
sysctl -p
错误类型2: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.
解决方法1: 临时设置生效: sysctl -w vm.overcommit_memory = 1
方法2: 永久生效: 修改/etc/sysctl.conf文件,增加一行
vm.overcommit_memory = 1
然后执行命令
sysctl -p