Ansible 文件行重新添加条目 [英] Ansible line-in-file re-adding entries
问题描述
我要解决的问题:我有几台服务器(在本例中为 3、1 个 nfs 服务器、2 个客户端 - 对于这个最小示例,它们都解析回本地主机),并且客户端需要访问服务器上的共享,这是使用剧本创建的.
What I'm trying to solve: I have several servers (in this example 3, 1 nfs server, 2 clients - they all resolve back to localhost for this minimal example), and the clients need to access shares on the server, which are created using the playbook.
客户端的 IP 地址需要添加到/etc/exports 中的相应条目中 - 该列表在任何给定时间都未预定义.(在我的实际剧本中,我使用了可靠的事实,对于这个例子,我将它们添加为变量)
The IP addresses of the clients need to be added to the respective entries in /etc/exports as they go - the list is not predefined at any given time. (In my actual playbook I use ansible facts, for this example I've added them as a variable)
在 Ansible lineinfile regexp 中管理/etc/exports Vladimir非常友善,可以帮助完成最初的事情,这可行,但似乎不是幂等的.第一次正确添加了条目/ip 地址,但是第二次运行时,IP 地址被重新添加到/etc/exports 中的条目中,导致当时 nfs 被炸毁(重复条目)
In Ansible lineinfile regexp to manage /etc/exports Vladimir was so kind as to help with an initial thing, which works, but doesn't seem to be idempotent. The entries / ip addresses are added correctly the first time round, but the second run the IP addresses get re-added to the entries in /etc/exports, causing nfs to bomb out at that time (double entries)
更正/etc/exports:
Correct /etc/exports:
bar 192.168.34.47(rw,sync,no_root_squash,no_subtree_check) 192.168.34.46(rw,sync,no_root_squash,no_subtree_check)
foo 192.168.34.47(rw,sync,no_root_squash,no_subtree_check) 192.168.34.46(rw,sync,no_root_squash,no_subtree_check)
我得到了什么:
bar 192.168.34.47(rw,sync,no_root_squash,no_subtree_check) 192.168.34.46(rw,sync,no_root_squash,no_subtree_check) 192.168.34.47(rw,sync,no_root_squash,no_subtree_check) 192.168.34.46(rw,sync,no_root_squash,no_subtree_check)
foo 192.168.34.47(rw,sync,no_root_squash,no_subtree_check) 192.168.34.46(rw,sync,no_root_squash,no_subtree_check) 192.168.34.47(rw,sync,no_root_squash,no_subtree_check) 192.168.34.46(rw,sync,no_root_squash,no_subtree_check)
我一直在思考它,但我想不出任何有效的方法.我已将其提炼为以下剧本:
I've been butting my head around it but I can't come up with anything that works. I've distilled it down to the following playbook:
$ ansible-playbook main.yml
main.yml
的内容:
- hosts: localhost
become: yes
vars:
client_ip: 192.168.34.46
nfs_server: localhost
shares:
- bar
- foo
tasks:
- name: Mountpoint management
ansible.builtin.include_tasks: task.yml
loop: "{{ shares | default([]) }}"
loop_control:
loop_var: volume
args:
apply:
delegate_to: "{{ nfs_server }}"
- hosts: localhost
become: yes
vars:
client_ip: 192.168.34.47
nfs_server: localhost
shares:
- bar
- foo
tasks:
- name: Mountpoint management
ansible.builtin.include_tasks: task.yml
loop: "{{ shares | default([]) }}"
loop_control:
loop_var: volume
args:
apply:
delegate_to: "{{ nfs_server }}"
执行循环所需的第二个文件 task.yml
:
Second file task.yml
which is needed to do a loop:
---
---
- name: Ensure /etc/exports exists
ansible.builtin.file:
path: /etc/exports
owner: root
group: root
mode: '0644'
state: touch
changed_when: False
- name: Add host {{ client_ip }} to {{ volume }}
ansible.builtin.lineinfile:
path: "/etc/exports"
regex: '^{{ volume }}(\s+)({{ ip_regex }})*({{ mount_opts_regex }})*(\s*)(.*)$'
line: '{{ volume }}\g<1>{{ ip }}{{ mount_opts }} \g<5>'
backrefs: true
vars:
ip: "{{ client_ip }}"
ip_regex: '{{ client_ip | regex_escape() }}'
mount_opts: '(rw,sync,no_root_squash,no_subtree_check)'
mount_opts_regex: '\(.*?\)'
- name: Read /etc/exports
command: "cat {{ item }}"
register: result
check_mode: no
loop:
- /etc/exports
changed_when: False
- ansible.builtin.set_fact:
content: "{{ dict(_files|zip(_lines)) }}"
vars:
_lines: "{{ result.results|map(attribute='stdout_lines')|list }}"
_files: "{{ result.results|map(attribute='item')|list }}"
- name: Add new line to /etc/exports
ansible.builtin.lineinfile:
path: "/etc/exports"
line: '{{ volume }} {{ client_ip }}{{ mount_opts }}'
vars:
mount_opts: '(rw,sync,no_root_squash,no_subtree_check)'
loop: "{{ content }}"
when: content[item] | select('search', volume)|length == 0
推荐答案
好吧,经过深思熟虑,我终于开始构建两个列表,将它们映射到一个 dict 并检查这些值是否已经存在.如果是,不要做任何事情,如果不是,添加它.
Well, thinking it through I finally went with constructing two lists, mapping those into a dict and checking if the values are already present. If they are, don't do anything, if not, add it.
main.yaml:
- hosts: localhost
become: yes
vars:
client_ip: 192.168.34.46
nfs_server: localhost
shares:
- bar
- foo
tasks:
- name: Mountpoint management
ansible.builtin.include_tasks: task.yml
loop: "{{ shares | default([]) }}"
loop_control:
loop_var: volume
args:
apply:
delegate_to: "{{ nfs_server }}"
- hosts: localhost
become: yes
vars:
client_ip: 192.168.34.47
nfs_server: localhost
shares:
- bar
- foo
tasks:
- name: Mountpoint management
ansible.builtin.include_tasks: task.yml
loop: "{{ shares | default([]) }}"
loop_control:
loop_var: volume
args:
apply:
delegate_to: "{{ nfs_server }}"
task.yaml:
---
- name: Ensure /etc/exports exists
ansible.builtin.file:
path: /etc/exports
owner: root
group: root
mode: '0644'
state: touch
changed_when: false
- name: Read /etc/exports
command: "cat /etc/exports"
register: result
check_mode: no
changed_when: false
- ansible.builtin.set_fact:
share_names: "{{ share_names | default([]) + [item.split(' ')[0]] }}"
share_values: "{{ share_values | default([]) + [item.split(' ')[1:]] }}"
loop:
"{{ result.stdout_lines }}"
- ansible.builtin.set_fact:
share_content: "{{ dict(share_names | zip(share_values)) }}"
- name: Add host {{ client_ip }} to {{ volume }}
ansible.builtin.lineinfile:
path: "/etc/exports"
regex: '^{{ volume }}(\s+)({{ ip_regex }})*({{ mount_opts_regex }})*(\s*)(.*)$'
line: '{{ volume }}\g<1>{{ client_ip }}{{ mount_opts }} \g<5>'
backrefs: true
vars:
ip_regex: '{{ client_ip | regex_escape() }}'
mount_opts: '(rw,sync,no_root_squash,no_subtree_check)'
mount_opts_regex: '\(.*?\)'
str: '{{ client_ip }}{{ mount_opts }}'
when: volume in share_content and str not in share_content[volume]
- name: Add new line to /etc/exports
ansible.builtin.lineinfile:
path: "/etc/exports"
line: '{{ volume }} {{ client_ip }}{{ mount_opts }}'
vars:
mount_opts: '(rw,sync,no_root_squash,no_subtree_check)'
loop: "{{ share_content }}"
when: volume not in share_content
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