[英]Ansible systemd mount dependency
I use Ansible to deploy a systemd unit file to all the servers in an estate and enable it to start on boot.我使用 Ansible 将 systemd 单元文件部署到房地产中的所有服务器并使其能够在启动时启动。 On some of those servers, the binary defined in the unit file is on a different filesystem.
在其中一些服务器上,单元文件中定义的二进制文件位于不同的文件系统上。 This requires the unit file to have a dependency on that filesystem being mounted.
这要求单元文件依赖于被挂载的文件系统。 Eg:
例如:
[Unit]
Description = Start the widget
After = network.target usr.mount
[Service]
Type = simple
ExecStart = /usr/bin/widget
[Install]
WantedBy = multi-user.target
Currently the unit file is deployed by Ansible as a static file, using the ansible.builtin.copy
module.目前,单元文件由 Ansible 部署为 static 文件,使用
ansible.builtin.copy
模块。 Is there a way I can convert this to a template and append the mountpoint to After =
if /usr
is a mountpoint?有没有办法可以将它转换为模板和 append 挂载点到
After =
如果/usr
是挂载点?
Ansible fact ansible_mounts keeps the list of the mount points. Ansible 事实上ansible_mounts保存挂载点列表。 Let's use the following vars for testing
让我们使用以下变量进行测试
widgets:
- /usr/local/apps/widget
- /usr/share/apps/widget
- /scratch/apps/widget
my_ansible_mounts:
- mount: /
- mount: /boot/efi
- mount: /usr
- mount: /usr/local
root:
- /
Create a dictionary of widgets and related mount points, eg创建小部件和相关安装点的字典,例如
- set_fact:
_mlist: []
- set_fact:
_mlist: "{{ _mlist + [{'dict': item.0, 'mount': item.1}] }}"
with_nested:
- "{{ widgets }}"
- "{{ my_ansible_mounts|map(attribute='mount')|difference(root) }}"
when: item.0|regex_search('^' ~ item.1) != None
- set_fact:
_mdict: {}
- set_fact:
_mdict: "{{ _mdict|combine({item.0: item.1|
map(attribute='mount')|
map('regex_replace', '/', '-')|
list}) }}"
loop: "{{ _mlist|groupby('dict') }}"
gives给
_mdict:
/usr/local/apps/widget:
- -usr
- -usr-local
/usr/share/apps/widget:
- -usr
Then the flow should be trivial, eg那么流程应该是微不足道的,例如
- debug:
msg: |-
{% if _mdict[item]|default([])|length > 0 %}
[Unit]
Description = Start the widget
After = network.target{% for i in _mdict[item] %} {{ i[1:] }}.mount{% endfor %}
{% endif %}
[Service]
Type = simple
ExecStart = {{ item }}
loop: "{{ widgets }}"
gives给
ok: [localhost] => (item=/usr/local/apps/widget) =>
msg: |-
[Unit]
Description = Start the widget
After = network.target usr.mount usr-local.mount
[Service]
Type = simple
ExecStart = /usr/local/apps/widget
ok: [localhost] => (item=/usr/share/apps/widget) =>
msg: |-
[Unit]
Description = Start the widget
After = network.target usr.mount
[Service]
Type = simple
ExecStart = /usr/share/apps/widget
ok: [localhost] => (item=/scratch/apps/widget) =>
msg: |-
[Service]
Type = simple
ExecStart = /scratch/apps/widget
To test the real stuff, in the code, replace my_ansible_mounts with ansible_mounts and fit the widgets and hosts to your needs.要测试真实的东西,在代码中,将my_ansible_mounts替换为ansible_mounts并根据您的需要调整小部件和主机。
Just use template task and in src template task have a condition to print required block based on a condition.只需使用模板任务,并且在src模板任务中有条件根据条件打印所需的块。 You can pass a varible to template task and make a decision based on it, ie.
您可以将变量传递给模板任务并根据它做出决定,即。 you first check if that filesystem is needed in a task, then generate file based on the template task.
您首先检查任务中是否需要该文件系统,然后根据模板任务生成文件。
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