我想/etc/fstab
根據變數中定義的 UUID 列印特定行。但是當我嘗試使用下面的程式碼時,它沒有給出正確的結果。
代碼:
---
- 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
問:“根據變數中定義的 UUID 從檔案中列印行。”
A:取得檔案並選擇行。例如,聲明控制器上儲存/etc/fstab的路徑
fstab_path: "/tmp/test/{{ inventory_hostname }}/fstab"
並獲取文件
- fetch:
src: /etc/fstab
dest: "{{ fstab_path }}"
flat: true
給定具有 UUID 值的變數
uuid_disk: 01865fce-8bb9-48ad-a9eb-1ff43a8db4a5
搜尋該行
uuid_line: "{{ lookup('file', fstab_path).splitlines()|
select('search', uuid_disk) }}"
例如給出,
uuid_line:
- UUID=01865fce-8bb9-48ad-a9eb-1ff43a8db4a5 none swap sw 0 0
用於測試的完整劇本範例
- 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
上述解決方案列印標記為 UUID 的 fstab 行交換。 (這就是獲取 UUID 的方法。)反之亦然,您可以列印用作的分割區交換在 fstab 中。讓我重新表達這個問題
問:“從 /etc/fstab 取得交換分區的 UUID。然後,顯示分區。”
答:首先收集事實並建立一個字典 UUID/分區。然後,解析 /etc/fstab 並取得交換條目的 UUID。取得 UUID 的分區。
- 收集事實
- setup:
gather_subset: devices
,取得分區,並建立字典uuid
partitions: "{{ ansible_devices|
json_query('*.partitions')|
combine }}"
uuid: "{{ dict(partitions|
dict2items|
selectattr('value.uuid')|
json_query('[].[value.uuid, key]')) }}"
例如給出,
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
- 聲明控制器上儲存 /etc/fstab 的路徑
fstab_path: "/tmp/test/{{ inventory_hostname }}/fstab"
並獲取文件
- fetch:
src: /etc/fstab
dest: "{{ fstab_path }}"
flat: true
使用過濾器社區.general.jc建立字典列表系統表
fstab: "{{ lookup('file', fstab_path)|
community.general.jc('fstab') }}"
例如給出,
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
取得交換條目的 UUID
uuid_swap: "{{ fstab|
selectattr('fs_vfstype', '==', 'swap')|
selectattr('fs_spec', 'match', 'UUID=')|
map(attribute='fs_spec')|
map('split', '=')|
map('last') }}"
給出
uuid_swap:
- 01865fce-8bb9-48ad-a9eb-1ff43a8db4a5
- 取得 UUID 的分區
partition_swap: "{{ uuid_swap|map('extract', uuid) }}"
給出
partition_swap:
- sdb4
用於測試的完整劇本範例
- 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
關於
如何根據變數中定義的 UUID 列印文件中的特定行?
您可以查看以下最小範例劇本
---
- 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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