Question

我是Ansible的新手。我有以下playbook来更改远程服务器的主机名：

---
- hosts: dbservers
  remote_user: testuser1
  become: yes
  become_method: sudo

  vars: 
    LOCAL_HOSTNAME: 'db01'
    LOCAL_DOMAIN_NAME: 'ansibletest.com'

  tasks:
    # Checks and removed the existing occurences of <IP hostname FQDN> from /etc/hosts
    - name: Remove occurences of the existing IP
      lineinfile: dest=/etc/hosts
                  regexp='{{ hostvars[item].ansible_default_ipv4.address }}'
                  state=absent
      when: hostvars[item].ansible_default_ipv4.address is defined
      with_items: "{{ groups['dbservers'] }}"

    #  Adds the IP in the format  <IP hostname FQDN> to /etc/hosts
    - name: Add the IP and hostname to the hosts file
      lineinfile: dest=/etc/hosts
                  regexp='.*{{ item }}$'
                  line="{{ hostvars[item].ansible_default_ipv4.address }} {{ LOCAL_HOSTNAME }} {{ LOCAL_HOSTNAME }}.{{ LOCAL_DOMAIN_NAME }}"
                  state=present
      when: hostvars[item].ansible_default_ipv4.address is defined
      with_items: "{{ groups['dbservers'] }}"

    - name: Remove HOSTNAME occurences from /etc/sysconfig/network
      lineinfile: dest=/etc/sysconfig/network
                  regexp='^HOSTNAME'
                  state=absent
      when: hostvars[item].ansible_default_ipv4.address is defined
      with_items: "{{ groups['dbservers'] }}"

    - name: Add new HOSTNAME to /etc/sysconfig/network
      lineinfile: dest=/etc/sysconfig/network
                  regexp='^HOSTNAME='
                  line="HOSTNAME={{ LOCAL_HOSTNAME }}.{{ LOCAL_DOMAIN_NAME }}"
                  state=present
      when: hostvars[item].ansible_default_ipv4.address is defined
      with_items: "{{ groups['dbservers'] }}"

    - name: Set up the hostname
      hostname: name={{ LOCAL_HOSTNAME }}.{{ LOCAL_DOMAIN_NAME }}

在此示例中，LOCAL_HOSTNAME已分配值db01。在这种情况下，dbservers组只有一台服务器：

[dbservers]
192.168.1.93

但是，我还有另外两台服务器被指定为web服务器：

[webservers]
192.168.1.95
192.168.1.96

[dbservers]
192.168.1.93

目标是将其命名为web01.domain，web02.domain，依此类推。

根据docs，似乎可以通过with_sequence来实现此。

我的问题是，是否有可能（在Ansible中）在循环中使用2个变量？下面的伪代码行：

i=1
for host in webservers:
   open host(/etc/hosts):
       add "IP<space>HOSTNAME{i}<space>"<space>"HOSTNAME{i}.FQDN"
       i++

这可以通过剧本来实现，还是我以错误的方式处理这个问题？

Answer 1

首先生成索引主机名，将其定义为hostfact，稍后再使用它来填充其他服务器的主机文件。

- hosts: webservers
  gather_facts: no
  tasks:
    - set_fact:
        indexed_hostname: "{{ 'web{0:02d}'.format(play_hosts.index(inventory_hostname)+1) }}"

- hosts: dbservers
  gather_facts: no
  tasks:
    - debug:
        msg: "{{ hostvars[item].indexed_hostname }}"
      with_items: "{{ groups['webservers'] }}"

还有with_indexed_items这样的东西。

Ansible循环用于将顺序整数分配为主机名

1 个答案: