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Redis 服务在使用 systemctl 和 Type=notify 时挂起

tag-icon • tag-icon centos7 systemd redis
Redis 服务在使用 systemctl 和 Type=notify 时挂起

我已关注这个答案：https://serverfault.com/a/893075/210494。我有 CentOS 7.8。

redis.service

[Service]
Type=notify
ExecStart=/opt/redis/bin/redis-server /opt/redis/conf/redis-master.conf
TimeoutStartSec=60
TimeoutStopSec=60
TimeOutSec=90
RestartSec=5s
Restart=on-success

redis-master.conf

daemonize no
supervised systemd

当我运行此服务时，Redis 进程启动但挂起systemctl，我必须按 Ctrl-C 才能返回到 shell。

这是日志中的内容：

69486:C 28 Aug 2020 17:31:14.545 # Redis version=6.0.6, bits=64, commit=00000000, modified=0, pid=69486, just started
69486:C 28 Aug 2020 17:31:14.545 # Configuration loaded
69486:C 28 Aug 2020 17:31:14.545 # WARNING supervised by systemd - you MUST set appropriate values for TimeoutStartSec and TimeoutStopSec in your service unit.
69486:M 28 Aug 2020 17:31:14.546 * Increased maximum number of open files to 4096 (it was originally set to 1024).
69486:M 28 Aug 2020 17:31:14.547 * Running mode=standalone, port=6380.
69486:M 28 Aug 2020 17:31:14.547 # Server initialized

如果我注释掉Type=notify，那么 systemctl 会立即完成，但这会在日志中记录。

68629:C 28 Aug 2020 17:29:58.933 # Redis version=6.0.6, bits=64, commit=00000000, modified=0, pid=68629, just started
68629:C 28 Aug 2020 17:29:58.933 # Configuration loaded
68629:C 28 Aug 2020 17:29:58.933 # WARNING supervised by systemd - you MUST set appropriate values for TimeoutStartSec and TimeoutStopSec in your service unit.
68629:C 28 Aug 2020 17:29:58.933 # systemd supervision requested, but NOTIFY_SOCKET not found
68629:M 28 Aug 2020 17:29:58.933 * Increased maximum number of open files to 4096 (it was originally set to 1024).
68629:M 28 Aug 2020 17:29:58.934 * Running mode=standalone, port=6380.
68629:M 28 Aug 2020 17:29:58.934 # Server initialized

问题出在哪里？我找到了 DigitalOcean 教程，但他们没有提供Type=notify，而且当他们成功推荐时，我发现了 Redis 的问题Type=notify。

更新

Job for redis.service failed because a timeout was exceeded. See "systemctl status redis.service" and "journalctl -xe" for details.
[root@DB dev]# systemctl status redis
● redis.service - Redis
   Loaded: loaded (/etc/systemd/system/redis.service; enabled; vendor preset: disabled)
   Active: failed (Result: timeout) since Sun 2020-08-30 12:06:58 CEST; 46min ago
  Process: 11134 ExecStart=/opt/app/redis/default/bin/redis-server /opt/app/redis/default/conf/redis-master.conf (code=exited, status=0/SUCCESS)
 Main PID: 11134 (code=exited, status=0/SUCCESS)
Aug 30 12:05:57 DB systemd[1]: Starting Redis...
Aug 30 12:06:58 DB systemd[1]: redis.service start operation timed out. Terminating.
Aug 30 12:06:58 DB systemd[1]: Failed to start Redis.
Aug 30 12:06:58 DB systemd[1]: Unit redis.service entered failed state.
Aug 30 12:06:58 DB systemd[1]: redis.service failed.

答案1

好的，问题是systemd默认情况下不支持编译。您需要明确编译它。我将编写一个 PR 来更新源代码中的 README.md，因为没有解释这一点。

这犯罪对此行为负责。我在这个问题中找到了它：https://github.com/redis/redis/issues/7217

yum install systemd-devel
make BUILD_WITH_SYSTEMD=yes USE_SYSTEMD=yes

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