如何使用 systemctl 和 systemd 启动 Unicorn

Question

我想在 amazon-linux-2 上用 systemctl 启动 Unicorn，但 Unicorn 没有启动。

我写了一个 /etc/systemd/system/unicorn.service 文件。

[Unit]
Description=The unicorn process

[Service]
User=myname
WorkingDirectory=/var/www/rails/myapp
SyslogIdentifier=unicorn
Type=simple

ExecStart=/bin/bash -l -c 'bundle exec unicorn_rails -c /var/www/rails/myapp/config/unicorn.conf.rb -E production -D'

[Install]
WantedBy=multi-user.target

这是我用来启动服务的命令

sudo systemctl daemon-reload
sudo systemctl start unicorn.service

我用命令ps -ef | grep unicorn | grep -v grep找不到任何关于独角兽的进程。

我在这里查看状态：

$ sudo systemctl status unicorn -l
● unicorn.service - The unicorn process
   Loaded: loaded (/etc/systemd/system/unicorn.service; disabled; vendor preset: disabled)
   Active: inactive (dead)

xxx.compute.internal systemd[1]: Started The unicorn process.
xxx.compute.internal systemd[1]: Starting The unicorn process...

这里是 unicorn.log。 （没有任何错误日志）

I, [2020-11-25T20:00:24.564840 #6604]  INFO -- : Refreshing Gem list
I, [2020-11-25T20:00:25.278814 #6604]  INFO -- : unlinking existing socket=/var/www/rails/myapp/tmp/sockets/.unicorn.sock
I, [2020-11-25T20:00:25.279020 #6604]  INFO -- : listening on addr=/var/www/rails/myapp/tmp/sockets/.unicorn.sock fd=9
I, [2020-11-25T20:00:25.299977 #6604]  INFO -- : master process ready
I, [2020-11-25T20:00:25.406567 #6604]  INFO -- : reaped #<Process::Status: pid 6607 exit 0> worker=0
I, [2020-11-25T20:00:25.406659 #6604]  INFO -- : reaped #<Process::Status: pid 6608 exit 0> worker=1
I, [2020-11-25T20:00:25.406760 #6604]  INFO -- : master complete

为什么独角兽不启动？

Answer 1

将Type=simple 更改为Type=forking。