/vagrant 挂载后如何运行 nginx.service

Question

我想做什么？

我正在尝试通过 vagrant 自动挂载 /vagrant 进行 nginx 加载配置。

所以我编辑了 nginx.service 使其在共享文件夹挂载后启动，但它不起作用。

当然，nginx 已经在 virtualbox-guest-utils.service 之后启动，但是，它似乎在 vagrant.mount (/vagrant) 之前启动。 因为 nginx 无法从 /vagrant 加载配置，并且手动运行命令 systemctl restart nginx.service 后它可以工作。

自动生成的 .mount 单元启动后如何运行 .service 单元？

环境

• 流浪者 1.8.1
• Ubuntu 服务器 15.10 (ubuntu/wily64)
• VirtualBox 5.0.14

systemctl cat nginx.service

模式 1：无效

# /lib/systemd/system/nginx.service
# Stop dance for nginx
# =======================
#
# ExecStop sends SIGSTOP (graceful stop) to the nginx process.
# If, after 5s (--retry QUIT/5) nginx is still running, systemd takes control
# and sends SIGTERM (fast shutdown) to the main process.
# After another 5s (TimeoutStopSec=5), and if nginx is alive, systemd sends
# SIGKILL to all the remaining processes in the process group (KillMode=mixed).
#
# nginx signals reference doc:
# http://nginx.org/en/docs/control.html
#
[Unit]
Description=A high performance web server and a reverse proxy server
After=network.target

[Service]
Type=forking
PIDFile=/run/nginx.pid
ExecStartPre=/usr/sbin/nginx -t -q -g 'daemon on; master_process on;'
ExecStart=/usr/sbin/nginx -g 'daemon on; master_process on;'
ExecReload=/usr/sbin/nginx -g 'daemon on; master_process on;' -s reload
ExecStop=-/sbin/start-stop-daemon --quiet --stop --retry QUIT/5 --pidfile /run/nginx.pid
TimeoutStopSec=5
KillMode=mixed

[Install]
WantedBy=multi-user.target

# /etc/systemd/system/nginx.service.d/override.conf
[Unit]
Requires=virtualbox-guest-utils.service vagrant.mount
After=virtualbox-guest-utils.service vagrant.mount

模式 2：不工作

# /lib/systemd/system/nginx.service
# Stop dance for nginx
# =======================
#
# ExecStop sends SIGSTOP (graceful stop) to the nginx process.
# If, after 5s (--retry QUIT/5) nginx is still running, systemd takes control
# and sends SIGTERM (fast shutdown) to the main process.
# After another 5s (TimeoutStopSec=5), and if nginx is alive, systemd sends
# SIGKILL to all the remaining processes in the process group (KillMode=mixed).
#
# nginx signals reference doc:
# http://nginx.org/en/docs/control.html
#
[Unit]
Description=A high performance web server and a reverse proxy server
After=network.target

[Service]
Type=forking
PIDFile=/run/nginx.pid
ExecStartPre=/usr/sbin/nginx -t -q -g 'daemon on; master_process on;'
ExecStart=/usr/sbin/nginx -g 'daemon on; master_process on;'
ExecReload=/usr/sbin/nginx -g 'daemon on; master_process on;' -s reload
ExecStop=-/sbin/start-stop-daemon --quiet --stop --retry QUIT/5 --pidfile /run/nginx.pid
TimeoutStopSec=5
KillMode=mixed

[Install]
WantedBy=multi-user.target

# /etc/systemd/system/nginx.service.d/override.conf
[Unit]
RequiresMountsFor=/vagrant

Answer 1

使用 mount.target 单元似乎可以工作。

流浪文件：

# -*- mode: ruby -*-
# vi: set ft=ruby :

Vagrant.configure("2") do |config|
  config.vm.box = "ubuntu/wily64"
  config.vm.provision :shell, path: "bootstrap.sh"

  # Disabling mounting of the /vagrant directory to make sure ngnix is blocked
  # Comment this out to allow the shared folder
  config.vm.synced_folder ".", "/vagrant", disabled: true
end

bootstrap.sh：

#!/usr/bin/env bash

apt-get update
apt-get install -y nginx

# Make vagrant.mount loosely dependent on nginx.service
sed -i 's/WantedBy=multi-user.target/WantedBy=vagrant.mount/' /lib/systemd/system/nginx.service
systemctl daemon-reload

# Update service symlinks
systemctl disable nginx.service
systemctl enable nginx.service

通过运行vagrant reload 进行测试，以使虚拟机在没有安装 /vagrant 目录的情况下启动。登录虚拟机，发现 nginx 没有运行：

vagrant@vagrant-ubuntu-wily-64:~$ sudo systemctl status nginx.service 
● nginx.service - A high performance web server and a reverse proxy server
   Loaded: loaded (/lib/systemd/system/nginx.service; enabled; vendor preset: enabled)
   Active: inactive (dead)

然后注释掉禁用共享文件夹和vagrant reload 的 Vagrantfile 行。再次登录VM，看到nginx正在运行：

vagrant@vagrant-ubuntu-wily-64:~$ systemctl status nginx.service 
● nginx.service - A high performance web server and a reverse proxy server
  Loaded: loaded (/lib/systemd/system/nginx.service; enabled; vendor preset: enabled)
  Active: active (running) since Mon 2016-07-25 04:28:00 UTC; 42s ago
 Process: 1152 ExecStart=/usr/sbin/nginx -g daemon on; master_process on; (code=exited, status=0/SUCCESS)
 Process: 1146 ExecStartPre=/usr/sbin/nginx -t -q -g daemon on; master_process on; (code=exited, status=0/SUCCESS)
Main PID: 1156 (nginx)
  Memory: 7.4M
     CPU: 17ms
  CGroup: /system.slice/nginx.service
          ├─1156 nginx: master process /usr/sbin/nginx -g daemon on; master_process on;
      └─1157 nginx: worker process

Answer 2

编辑/lib/systemd/system/nginx.service 并在Install 部分下更改WantedBy 指令...

WantedBy=vagrant.mount

您可以通过systemctl list-units vagrant.mount 检查vagrant.mount 事件是否存在。你应该看到这个：

UNIT          LOAD   ACTIVE SUB     DESCRIPTION
vagrant.mount loaded active mounted /vagrant

LOAD   = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB    = The low-level unit activation state, values depend on unit type.

1 loaded units listed. Pass --all to see loaded but inactive units, too.
To show all installed unit files use 'systemctl list-unit-files'.

Answer 3

根据 Ansible 总结以前的答案和 cmets（如果用于提供）：

- name: Copy Nginx Systemd unit to /etc/
  copy:
    src: /lib/systemd/system/nginx.service
    dest: /etc/systemd/system/nginx.service
    remote_src: yes

- name: Change Nginx Systemd unit
  lineinfile:
    path: /etc/systemd/system/nginx.service
    regexp: '^WantedBy='
    line: 'WantedBy={{ vagrant_mount_unit }}'
    state: present

- name: Systemd daemon reload
  systemd:
    daemon_reload: yes

- name: Disable Nginx
  service:
    name: nginx
    enabled: no

- name: Enable Nginx
  service:
    name: nginx
    enabled: yes

用 Vagrant 挂载单元名称替换 {{ vagrant_mount_unit }}。它取决于挂载点，例如如果挂载点为/home/vagrant/app，则单元名称为home-vagrant-app.mount。

Answer 4

我写了一个post how I'm using udev event to restart nginx and php5-fpm。

简而言之，我将使用规则添加/etc/udev/rules.d/50-vagrant-mount.rules：

SUBSYSTEM=="bdi",ACTION=="add",RUN+="/bin/bash /root/.udev-mount-restart-services.sh"

而脚本/root/.udev-mount-restart-services.sh是：

sleep 5 # wait for a bit for NFS to make sure resources are available
systemctl restart php5-fpm > /dev/null 2>&1
systemctl restart nginx > /dev/null 2>&1

Answer 5

我想在这里放弃我自己的答案，因为似乎每个答案都有正确答案的一部分，并且一些细节只能在 cmets 中找到。

在本例中，我在 /var/www/mymount1 和 /var/www/mymount2 中有 2 个文件系统挂载

我的 Vagrantfile 的这一部分：

config.vm.provision "shell", path: "docs/vagrant/init-vagrant.sh"
config.vm.synced_folder "mymount1", "/var/www/mymount1", type: "nfs"
config.vm.synced_folder "mymount2", "/var/www/mymount2", type: "nfs"

我将下面的脚本放在 /docs/vagrant/init-vagrant.sh 作为我的配置文件。

# Copy nginx systemd script and make edits in /etc/systemd/system, as updates might change the original in /lib/systemd/system/nginx.service
cp /lib/systemd/system/nginx.service /etc/systemd/system/
# These tell that nginx should not be started before file system mounts are available
echo WantedBy=var-www-mymount1.mount >> /etc/systemd/system/nginx.service
echo WantedBy=var-www-mymount2.mount >> /etc/systemd/system/nginx.service

# Update service symlinks
systemctl daemon-reload
systemctl disable nginx.service
systemctl enable nginx.service