此错误是由于BGSAVE失败导致的。在BGSAVE期间，Redis会fork一个子进程来将数据保存到磁盘上。虽然BGSAVE失败的确切原因可以从日志中检查(通常在linux机器上的/var/log/redis/redis-server.log)，但很多时候bgive失败是因为fork不能分配内存。很多时候，由于操作系统的优化冲突，fork无法分配内存(尽管机器有足够的可用RAM)。

可以从Redis常见问题中阅读:

Redis background saving schema relies on the copy-on-write semantic of fork in modern operating systems: Redis forks (creates a child process) that is an exact copy of the parent. The child process dumps the DB on disk and finally exits. In theory the child should use as much memory as the parent being a copy, but actually thanks to the copy-on-write semantic implemented by most modern operating systems the parent and child process will share the common memory pages. A page will be duplicated only when it changes in the child or in the parent. Since in theory all the pages may change while the child process is saving, Linux can't tell in advance how much memory the child will take, so if the overcommit_memory setting is set to zero fork will fail unless there is as much free RAM as required to really duplicate all the parent memory pages, with the result that if you have a Redis dataset of 3 GB and just 2 GB of free memory it will fail. Setting overcommit_memory to 1 says Linux to relax and perform the fork in a more optimistic allocation fashion, and this is indeed what you want for Redis.

Redis不需要像操作系统认为的那样多的内存来写入磁盘，所以可能会预先导致fork失败。

要解决这个问题，您可以:

修改/etc/sysctl.conf，增加:

vm.overcommit_memory=1

然后重新启动sysctl:

在FreeBSD上:

sudo /etc/rc.d/sysctl reload

在Linux上:

sudo sysctl -p /etc/sysctl.conf

在我的例子中，它与磁盘空闲空间有关。(你可以用df -h bash命令检查它)当我释放一些空间时，这个错误消失了。

一个更永久的修复方法可能是查看/etc/redis/redis.conf中200-250行左右的rdb特性的设置，这不是redis 2中的一部分。x天。

值得注意的是

dir ./

可更改为

dir /home/someuser/redislogfiledirectory

或者您可以注释掉所有保存行，而不用担心持久性。(见/etc/redis/redis.conf中的注释)

还有，别忘了

service redis-server stop
service redis-server start

我也面临着同样的问题。两个答案(被点赞最多的和被接受的)都只是暂时的解决办法。

此外，配置set stop-writes-on-bgsave-error no是一种可怕的忽略这个错误的方式，因为这个选项所做的是阻止redis通知写已经停止，并继续在快照中不写数据。这是简单地忽略这个错误。 请参考这个

至于在redis-cli的config中设置dir，当你重新启动redis服务时，这个问题也会被清除，并且会再次弹出相同的错误。在redis.conf中dir的默认值是。/，如果你以root用户启动redis，那么。/是/，写权限不被授予，因此会出现错误。

最好的方法是在redis.conf文件中设置dir参数，并对该目录设置适当的权限。大多数debian发行版都将它放在/etc/redis/redis.conf中

是的，这是因为当前用户没有修改“dump.rdb”的权限。

因此，除了创建一个新的RDB文件，您还可以对旧文件授予权限(更改其所有权)。

在redis-cli中输入:

配置get dir

你会得到"/usr/local/var/db/redis"(这是redis写入数据的位置)

使用终端前往此位置

cd 
cd /usr/local/var/db

输入以下命令(使用我们的用户名):

sudo chown -R [username] db

这将改变为所有者。

这对我很有用。

此错误是由于BGSAVE失败导致的。在BGSAVE期间，Redis会fork一个子进程来将数据保存到磁盘上。虽然BGSAVE失败的确切原因可以从日志中检查(通常在linux机器上的/var/log/redis/redis-server.log)，但很多时候bgive失败是因为fork不能分配内存。很多时候，由于操作系统的优化冲突，fork无法分配内存(尽管机器有足够的可用RAM)。

可以从Redis常见问题中阅读:

Redis background saving schema relies on the copy-on-write semantic of fork in modern operating systems: Redis forks (creates a child process) that is an exact copy of the parent. The child process dumps the DB on disk and finally exits. In theory the child should use as much memory as the parent being a copy, but actually thanks to the copy-on-write semantic implemented by most modern operating systems the parent and child process will share the common memory pages. A page will be duplicated only when it changes in the child or in the parent. Since in theory all the pages may change while the child process is saving, Linux can't tell in advance how much memory the child will take, so if the overcommit_memory setting is set to zero fork will fail unless there is as much free RAM as required to really duplicate all the parent memory pages, with the result that if you have a Redis dataset of 3 GB and just 2 GB of free memory it will fail. Setting overcommit_memory to 1 says Linux to relax and perform the fork in a more optimistic allocation fashion, and this is indeed what you want for Redis.

Redis不需要像操作系统认为的那样多的内存来写入磁盘，所以可能会预先导致fork失败。

要解决这个问题，您可以:

修改/etc/sysctl.conf，增加:

vm.overcommit_memory=1

然后重新启动sysctl:

在FreeBSD上:

sudo /etc/rc.d/sysctl reload

在Linux上:

sudo sysctl -p /etc/sysctl.conf