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为什么 systemctl 没有在 CentOS 7 上启动 redis-server？

tag-icon • tag-icon redis centos7 systemctl
为什么 systemctl 没有在 CentOS 7 上启动 redis-server？

我已经在新的 CentOS 7 机器上安装了 redis，但无法使用 systemctl 启动它。

它的安装方式如下：

rpm -i http://dl.fedoraproject.org/pub/epel/beta/7/x86_64/epel-release-7-0.2.noarch.rpm
yum install redis

尝试像这样启动它似乎默默失败了（没有输出）：

systemctl start redis-server # also tried redis-server.service

尝试连接时会发生以下情况：

redis-cli
Could not connect to Redis at 127.0.0.1:6379: Connection refused
not connected>

但手动启动它是可行的：

[root@redis ~]# redis-server /etc/redis.conf
[root@redis ~]# redis-cli
127.0.0.1:6379>

有人知道出了什么问题，或者如何调试它吗？

更新：输出/var/log/redis/redis.log如下。顺便说一下，这是一个 512mb RAM VPS。

[1972] 29 Jul 18:52:16.258 # You requested maxclients of 10000 requiring at least 10032 max file descriptors.
[1972] 29 Jul 18:52:16.258 # Redis can't set maximum open files to 10032 because of OS error: Operation not permitted.
[1972] 29 Jul 18:52:16.258 # Current maximum open files is 1024. maxclients has been reduced to 4064 to compensate for low ulimit. If you need higher maxclients increase 'ulimit -n'.
                _._
           _.-``__ ''-._
      _.-``    `.  `_.  ''-._           Redis 2.8.13 (00000000/0) 64 bit
  .-`` .-```.  ```\/    _.,_ ''-._
 (    '      ,       .-`  | `,    )     Running in stand alone mode
 |`-._`-...-` __...-.``-._|'` _.-'|     Port: 6379
 |    `-._   `._    /     _.-'    |     PID: 1972
  `-._    `-._  `-./  _.-'    _.-'
 |`-._`-._    `-.__.-'    _.-'_.-'|
 |    `-._`-._        _.-'_.-'    |           http://redis.io
  `-._    `-._`-.__.-'_.-'    _.-'
 |`-._`-._    `-.__.-'    _.-'_.-'|
 |    `-._`-._        _.-'_.-'    |
  `-._    `-._`-.__.-'_.-'    _.-'
      `-._    `-.__.-'    _.-'
          `-._        _.-'
              `-.__.-'

[1972] 29 Jul 18:52:16.259 # Server started, Redis version 2.8.13
[1972] 29 Jul 18:52:16.259 # 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.
[1972] 29 Jul 18:52:16.260 * DB loaded from disk: 0.001 seconds
[1972] 29 Jul 18:52:16.260 * The server is now ready to accept connections on port 6379
[1972] 29 Jul 18:52:16.265 # User requested shutdown...
[1972] 29 Jul 18:52:16.265 * Saving the final RDB snapshot before exiting.
[1972] 29 Jul 18:52:16.267 * DB saved on disk
[1972] 29 Jul 18:52:16.267 * Removing the pid file.
[1972] 29 Jul 18:52:16.267 # Redis is now ready to exit, bye bye...

和状态：

[root@redis ~]# systemctl status redis-server
redis-server.service - Redis persistent key-value database
   Loaded: loaded (/usr/lib/systemd/system/redis-server.service; disabled)
   Active: inactive (dead)

Jul 29 18:52:16 redis systemd[1]: Starting Redis persistent key-value database...
Jul 29 18:52:16 redis systemd[1]: Started Redis persistent key-value database.

答案1

最后，修复了它。Systemd 需要 redis 以非守护进程方式运行，因此需要更改配置：

# /etc/redis.conf
daemonize yes # << comment this out

答案2

只是为了补充已接受的答案，我最近更新redis并遇到了同样的问题。配置文件/etc/redis.conf已经有了这一行daemonize no，但我仍然遇到这个问题。

我通过告诉redis与主管互动来解决这个问题systemd：

# /etc/redis.conf
supervised auto # or systemd

作为参考，我使用的系统运行的是 Arch Linux。

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