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Accepted
Paulo Coghi
Asked: 2021-02-04 07:39:33 +0800 CST

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

  • 772

supervised systemd在 Ubuntu Server 20.04 上，Redis (5.0.7) 设置为 on后不会启动/etc/redis/redis.conf，但使用 . 手动运行时不会打印错误/usr/bin/redis-server /etc/redis/redis.conf。

此外，当手动运行时，可能会发现它正在侦听 6379 端口netstat -tulpn。

重现

作为根：

  • 更新软件包并安装 Redisapt update && apt install redis-server
  • 上/etc/redis/redis.conf，将行更改supervised no为supervised systemd
  • 尝试使用service redis-server restartor重启 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.

的输出systemctl status redis-server.service是：

● 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 服务时不会打印任何日志/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

系统 245 (245.4-4ubuntu3.4)

systemd ubuntu-20.04 redis systemd-service

2 个回答

  1. Best Answer

    这很奇怪，但是 Ubuntu 安装 redis-server并没有使用 redis 与 systemd 通信的能力。在这个平台上，你应该保留 redis.conf 的设置supervised no：

    如果您出于某种原因确实想启用此功能，则必须自定义 systemd 单元，例如：

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

    在 nano 中，您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

    现在你需要编辑 redis.conf：

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

    并进行以下更改：

    daemonize no
supervised systemd

    现在您可以重新启动 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.
    • 3

  2. 使用 -sudo systemctl start redis.service第一次

    • 0

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