我们一直在许多 AWS EC2 Ubuntu 实例 (14.04.4 LTS) 上运行 redis-server，没有出现任何问题。我启动了一个测试服务器来尝试升级到 Ubuntu 16.04.1 LTS，现在 redis 无法工作。
如果我尝试手动启动 redis，我会得到以下信息：
~$ sudo service redis-server restart
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.
错误信息：
~$ 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: inactive (dead) (Result: exit-code) since Wed 2016-10-19 19:26:06 UTC; 25min ago
Docs: http://redis.io/documentation,
man:redis-server(1)
Process: 3730 ExecStart=/usr/bin/redis-server /etc/redis/redis.conf (code=exited, …