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无法在 Ubuntu Server 20.04.2 上将 Redis 初始化为 systemd 服务（受监督的 systemd）

tag-icon • tag-icon systemd redis ubuntu-20.04 systemd-service
无法在 Ubuntu Server 20.04.2 上将 Redis 初始化为 systemd 服务（受监督的 systemd）

supervised systemd在 Ubuntu Server 20.04 上，设置后 Redis (5.0.7) 无法启动/etc/redis/redis.conf，但使用 手动运行它时不会打印任何错误/usr/bin/redis-server /etc/redis/redis.conf。

另外，手动运行时，可能会发现它正在监听端口 6379 netstat -tulpn。

复制

以 root 身份：

  • 使用以下方法更新软件包并安装 Redisapt update && apt install redis-server
  • 在上/etc/redis/redis.conf，将行更改supervised no为supervised systemd
  • 尝试使用service redis-server restart或重新启动 Redissystemctl restart redis

上述命令的输出是：

Job for redis-server.service failed because the control process exited with error code.
See "systemctl status redis-server.service" and "journalctl -xe" for details.

输出为systemctl status redis-server.service：

● redis-server.service - Advanced key-value store
     Loaded: loaded (/lib/systemd/system/redis-server.service; enabled; vendor preset: enabled)
     Active: failed (Result: exit-code) since Wed 2021-02-03 12:15:56 -03; 28s ago
       Docs: http://redis.io/documentation,
             man:redis-server(1)
    Process: 3851 ExecStart=/usr/bin/redis-server /etc/redis/redis.conf (code=exited, status=1/FAILURE)

Feb 03 12:15:56 mywebsite.com systemd[1]: redis-server.service: Scheduled restart job, restart counter is at 5.
Feb 03 12:15:56 mywebsite.com systemd[1]: Stopped Advanced key-value store.
Feb 03 12:15:56 mywebsite.com systemd[1]: redis-server.service: Start request repeated too quickly.
Feb 03 12:15:56 mywebsite.com systemd[1]: redis-server.service: Failed with result 'exit-code'.
Feb 03 12:15:56 mywebsite.com systemd[1]: Failed to start Advanced key-value store.

尝试重新启动 Redis 服务时没有打印任何日志/var/log/redis/redis-server.log，但手动运行时会打印以下文本：

4231:C 03 Feb 2021 12:27:52.053 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
4231:C 03 Feb 2021 12:27:52.053 # Redis version=5.0.7, bits=64, commit=00000000, modified=0, pid=4231, just started
4231:C 03 Feb 2021 12:27:52.053 # Configuration loaded
4232:M 03 Feb 2021 12:27:52.063 * Increased maximum number of open files to 10032 (it was originally set to 1024).
                _._
           _.-``__ ''-._
      _.-``    `.  `_.  ''-._           Redis 5.0.7 (00000000/0) 64 bit
  .-`` .-```.  ```\/    _.,_ ''-._
 (    '      ,       .-`  | `,    )     Running in standalone mode
 |`-._`-...-` __...-.``-._|'` _.-'|     Port: 6379
 |    `-._   `._    /     _.-'    |     PID: 4232
  `-._    `-._  `-./  _.-'    _.-'
 |`-._`-._    `-.__.-'    _.-'_.-'|
 |    `-._`-._        _.-'_.-'    |           http://redis.io
  `-._    `-._`-.__.-'_.-'    _.-'
 |`-._`-._    `-.__.-'    _.-'_.-'|
 |    `-._`-._        _.-'_.-'    |
  `-._    `-._`-.__.-'_.-'    _.-'
      `-._    `-.__.-'    _.-'
          `-._        _.-'
              `-.__.-'

4232:M 03 Feb 2021 12:27:52.065 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
4232:M 03 Feb 2021 12:27:52.065 # Server initialized
4232:M 03 Feb 2021 12:27:52.066 * Ready to accept connections

软件版本：

Redis 服务器 v=5.0.7 sha=00000000:0 malloc=jemalloc-5.2.1 bits=64 build=636cde3b5c7a3923

Ubuntu 20.04.2 LTS - 64 位

systemd 245（245.4-4ubuntu3.4）

答案1

这很奇怪，但是 Ubuntu 安装 redis-server才不是使用 redis 与 systemd 通信的能力。在此平台上，您应保留 redis.conf 的设置，就像它出厂时一样：supervised no。

如果你真的如果由于某种原因想要启用此功能，则必须自定义 systemd 单元，例如：

ubuntu@vmtest-ubuntu2004:~$ sudo systemctl edit redis-server.service

在 nano 中，你应该只添加以下内容：

[Service]
Type=notify

然后告诉 systemd 加载更改。

ubuntu@vmtest-ubuntu2004:~$ sudo systemctl daemon-reload

现在您需要编辑 redis.conf：

ubuntu@vmtest-ubuntu2004:~$ sudo nano /etc/redis/redis.conf

并进行以下更改：

daemonize no
supervised systemd

现在可以重新启动 redis-server：

ubuntu@vmtest-ubuntu2004:~$ sudo systemctl start redis-server
ubuntu@vmtest-ubuntu2004:~$ sudo systemctl status redis-server
* redis-server.service - Advanced key-value store
     Loaded: loaded (/lib/systemd/system/redis-server.service; enabled; vendor preset: enabled)
    Drop-In: /etc/systemd/system/redis-server.service.d
             `-override.conf
     Active: active (running) since Wed 2021-02-03 11:55:09 EST; 1min 8s ago
       Docs: http://redis.io/documentation,
             man:redis-server(1)
   Main PID: 1768 (redis-server)
      Tasks: 4 (limit: 2318)
     Memory: 1.8M
     CGroup: /system.slice/redis-server.service
             `-1768 /usr/bin/redis-server 127.0.0.1:6379

Feb 03 11:55:09 vmtest-ubuntu2004 systemd[1]: Starting Advanced key-value store...
Feb 03 11:55:09 vmtest-ubuntu2004 systemd[1]: Started Advanced key-value store.

答案2

sudo systemctl start redis.service首次使用

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