我想/etc/fstab根据变量中定义的 UUID 打印特定行。但是当我尝试使用以下代码时，它没有给出正确的结果。
代码：
---
- name: check
hosts: all
become: true
tasks:
- name: set fact for uuid
set_fact:
uuid_disk: "{{ item.value.links.uuids }}"
loop: "{{ ansible_devices | dict2items }}"
when: ('swap' in (item.value.links.labels))
- name: print
debug:
msg: "{{ uuid_disk | join() }}"
- name: fstab
slurp:
src: /etc/fstab
register: output
- name: print
debug:
msg: "{{ item | select('match','UUID') | list }}"
loop: "{{ (output.content | b64decode).splitlines() }}"
- name: print
debug:
msg: "{{ item }}"
loop: "{{ (output.content | b64decode).splitlines() }}"
when: (item | regex_search('^UUID')) in uuid_disk
答案1
问：“根据变量中定义的 UUID 从文件中打印行。”
A：获取文件并选择行。例如，声明在控制器上存储 /etc/fstab 的路径
fstab_path: "/tmp/test/{{ inventory_hostname }}/fstab"
并获取文件
- fetch:
src: /etc/fstab
dest: "{{ fstab_path }}"
flat: true
给定具有 UUID 值的变量
uuid_disk: 01865fce-8bb9-48ad-a9eb-1ff43a8db4a5
搜索线路
uuid_line: "{{ lookup('file', fstab_path).splitlines()|
select('search', uuid_disk) }}"
例如，
uuid_line:
- UUID=01865fce-8bb9-48ad-a9eb-1ff43a8db4a5 none swap sw 0 0
完整测试剧本的示例
- hosts: all
vars:
uuid_disk: 01865fce-8bb9-48ad-a9eb-1ff43a8db4a5
fstab_path: "/tmp/test/{{ inventory_hostname }}/fstab"
uuid_line: "{{ lookup('file', fstab_path).splitlines()|
select('search', uuid_disk) }}"
tasks:
- fetch:
src: /etc/fstab
dest: "{{ fstab_path }}"
flat: true
- debug:
var: uuid_line
上述解决方案打印出标记为交换（这就是你获取 UUID 的方式。）反之亦然，你可以打印用作交换在 fstab 中。让我重新表述一下这个问题
问：“从 /etc/fstab 获取交换分区的 UUID。然后，显示该分区。”
答：首先收集事实并创建字典 UUID/分区。然后，解析 /etc/fstab 并获取交换条目的 UUID。获取 UUID 的分区。
- 收集事实
- setup:
gather_subset: devices
，获取分区，并创建字典唯一标识
partitions: "{{ ansible_devices|
json_query('*.partitions')|
combine }}"
uuid: "{{ dict(partitions|
dict2items|
selectattr('value.uuid')|
json_query('[].[value.uuid, key]')) }}"
例如，
uuid:
01865fce-8bb9-48ad-a9eb-1ff43a8db4a5: sdb4
04dc9170-bdbc-4a22-abaf-b9e3cf1ba969: sda5
7074BA0A74B9D2D8: sda2
9a2199dd-0662-47b4-a957-adbcf5d350f4: sdb5
EC808480808452CE: sda1
F86C-A380: sdb2
c484594d-fd2e-4f57-9c14-74b8e397d8ed: sdb3
- 声明控制器上存储 /etc/fstab 的路径
fstab_path: "/tmp/test/{{ inventory_hostname }}/fstab"
并获取文件
- fetch:
src: /etc/fstab
dest: "{{ fstab_path }}"
flat: true
使用过滤器社区.general.jc创建字典列表文件系统
fstab: "{{ lookup('file', fstab_path)|
community.general.jc('fstab') }}"
例如，
fstab:
- fs_file: /
fs_freq: 0
fs_mntops: errors=remount-ro
fs_passno: 1
fs_spec: UUID=c484594d-fd2e-4f57-9c14-74b8e397d8ed
fs_vfstype: ext4
- fs_file: /boot/efi
fs_freq: 0
fs_mntops: umask=0077
fs_passno: 1
fs_spec: UUID=F86C-A380
fs_vfstype: vfat
- fs_file: /export
fs_freq: 0
fs_mntops: defaults
fs_passno: 2
fs_spec: UUID=9a2199dd-0662-47b4-a957-adbcf5d350f4
fs_vfstype: ext4
- fs_file: none
fs_freq: 0
fs_mntops: sw
fs_passno: 0
fs_spec: UUID=01865fce-8bb9-48ad-a9eb-1ff43a8db4a5
fs_vfstype: swap
- fs_file: none
fs_freq: 0
fs_mntops: sw
fs_passno: 0
fs_spec: /usr/swap0
fs_vfstype: swap
获取交换条目的 UUID
uuid_swap: "{{ fstab|
selectattr('fs_vfstype', '==', 'swap')|
selectattr('fs_spec', 'match', 'UUID=')|
map(attribute='fs_spec')|
map('split', '=')|
map('last') }}"
给出
uuid_swap:
- 01865fce-8bb9-48ad-a9eb-1ff43a8db4a5
- 获取 UUID 的分区
partition_swap: "{{ uuid_swap|map('extract', uuid) }}"
给出
partition_swap:
- sdb4
完整测试剧本的示例
- hosts: all
vars:
partitions: "{{ ansible_devices|
json_query('*.partitions')|
combine }}"
uuid: "{{ dict(partitions|
dict2items|
selectattr('value.uuid')|
json_query('[].[value.uuid, key]')) }}"
fstab_path: "/tmp/test/{{ inventory_hostname }}/fstab"
fstab: "{{ lookup('file', fstab_path)|
community.general.jc('fstab') }}"
uuid_swap: "{{ fstab|
selectattr('fs_vfstype', '==', 'swap')|
selectattr('fs_spec', 'match', 'UUID=')|
map(attribute='fs_spec')|
map('split', '=')|
map('last') }}"
partition_swap: "{{ uuid_swap|map('extract', uuid) }}"
tasks:
- setup:
gather_subset: devices
- debug:
var: uuid
- fetch:
src: /etc/fstab
dest: "{{ fstab_path }}"
flat: true
- debug:
var: fstab
- debug:
var: uuid_swap
- debug:
var: partition_swap
答案2
关于
如何根据变量中定义的 UUID 从文件中打印特定行？
你可以看看下面的最小示例剧本
---
- hosts: localhost
become: false
gather_facts: false
vars:
uuid_disk: 12345678-abcd-efgh-ijkl-123456789012
tasks:
- name: fstab
slurp:
src: /etc/fstab
register: output
- name: Print UUID, if there is any
debug:
msg: "{{ item | regex_search('[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}') }}"
loop: "{{ (output.content | b64decode).splitlines() }}"
- name: Print line where UUID match
debug:
msg: "{{ item }}"
loop: "{{ (output.content | b64decode).splitlines() }}"
when: uuid_disk in item
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