风沙 2013-09-08 15:23 发表评论

1 [2963] 07 Sep 09:15:07.053 * 10 changes in 300 seconds. Saving
2 [2963] 07 Sep 09:15:07.055 * Background saving started by pid 3143
3 [3143] 07 Sep 09:15:07.058 # Failed opening .rdb for saving: Permission denied
4 [2963] 07 Sep 09:15:07.156 # Background saving error

 1 # The working directory.
 2 #
 3 # The DB will be written inside this directory, with the filename specified
 4 # above using the 'dbfilename' configuration directive.
 5 # 
 6 # The Append Only File will also be created inside this directory.
 7 # 
 8 # Note that you must specify a directory here, not a file name.
 9 dir ./

1 [3223] 07 Sep 09:29:57.007 * 10 changes in 300 seconds. Saving
2 [3223] 07 Sep 09:29:57.008 * Background saving started by pid 3270
3 [3270] 07 Sep 09:29:57.028 * DB saved on disk
4 [3270] 07 Sep 09:29:57.029 * RDB: 6 MB of memory used by copy-on-write
5 [3223] 07 Sep 09:29:57.112 * Background saving terminated with success

风沙 2013-09-08 00:38 发表评论

1 [29446] 07 Sep 08:14:14.162 # 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.

 

 

 

 

 

and don't use much of it.


明白了原因，那就根据提示进行修改吧！

方法1：只影响本次
1.验证系统中overcommit_memory的值，执行如下命令
重新运行redis，验证警告是否消失

风沙 2013-09-07 23:31 发表评论

Where to find complete Redis documentation?

-------------------------------------------

This README is just a fast "quick start" document. You can find more detailed

documentation at http://redis.io

Building Redis

--------------

Redis can be compiled and used on Linux, OSX, OpenBSD, NetBSD, FreeBSD.

We support big endian and little endian architectures.

It may compile on Solaris derived systems (for instance SmartOS) but our

support for this platform is "best effort" and Redis is not guaranteed to

work as well as in Linux, OSX, and *BSD there.

It is as simple as:

    % make

You can run a 32 bit Redis binary using:

    % make 32bit

After building Redis is a good idea to test it, using:

    % make test

Fixing problems building 32 bit binaries

---------

If after building Redis with a 32 bit target you need to rebuild it

with a 64 bit target, or the other way around, you need to perform a

"make distclean" in the root directory of the Redis distribution.

In case of build errors when trying to build a 32 bit binary of Redis, try

the following steps:

* Install the packages libc6-dev-i386 (also try g++-multilib).

* Try using the following command line instead of "make 32bit":

    make CFLAGS="-m32 -march=native" LDFLAGS="-m32"

Allocator

---------

Selecting a non-default memory allocator when building Redis is done by setting

the `MALLOC` environment variable. Redis is compiled and linked against libc

malloc by default, with the exception of jemalloc being the default on Linux

systems. This default was picked because jemalloc has proven to have fewer

fragmentation problems than libc malloc.

To force compiling against libc malloc, use:

    % make MALLOC=libc

To compile against jemalloc on Mac OS X systems, use:

    % make MALLOC=jemalloc

Verbose build

-------------

Redis will build with a user friendly colorized output by default.

If you want to see a more verbose output use the following:

    % make V=1

Running Redis

-------------

To run Redis with the default configuration just type:

    % cd src

    % ./redis-server

    

If you want to provide your redis.conf, you have to run it using an additional

parameter (the path of the configuration file):

    % cd src

    % ./redis-server /path/to/redis.conf

It is possible to alter the Redis configuration passing parameters directly

as options using the command line. Examples:

    % ./redis-server --port 9999 --slaveof 127.0.0.1 6379

    % ./redis-server /etc/redis/6379.conf --loglevel debug

All the options in redis.conf are also supported as options using the command

line, with exactly the same name.

Playing with Redis

------------------

You can use redis-cli to play with Redis. Start a redis-server instance,

then in another terminal try the following:

    % cd src

    % ./redis-cli

    redis> ping

    PONG

    redis> set foo bar

    OK

    redis> get foo

    "bar"

    redis> incr mycounter

    (integer) 1

    redis> incr mycounter

    (integer) 2

    redis> 

You can find the list of all the available commands here:

    http://redis.io/commands

Installing Redis

-----------------

In order to install Redis binaries into /usr/local/bin just use:

    % make install

You can use "make PREFIX=/some/other/directory install" if you wish to use a

different destination.

Make install will just install binaries in your system, but will not configure

init scripts and configuration files in the appropriate place. This is not

needed if you want just to play a bit with Redis, but if you are installing

it the proper way for a production system, we have a script doing this

for Ubuntu and Debian systems:

    % cd utils

    % ./install_server

The script will ask you a few questions and will setup everything you need

to run Redis properly as a background daemon that will start again on

system reboots.

You'll be able to stop and start Redis using the script named

/etc/init.d/redis_<portnumber>, for instance /etc/init.d/redis_6379.

Code contributions

---

Note: by contributing code to the Redis project in any form, including sending

a pull request via Github, a code fragment or patch via private email or

public discussion groups, you agree to release your code under the terms

of the BSD license that you can find in the COPYING file included in the Redis

source distribution.

Please see the CONTRIBUTING file in this source distribution for more

information.

Enjoy!

风沙 2013-09-07 20:15 发表评论