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实战--Playbook批量更改服务器主机名

2021-03-12 21:53:44 作者：互联网

Playbook 介绍

Playbook是一个不同于使用Ansible命令行执行方式的模式，其功能更强大灵活。简单来说，playbook是一个非常简单的配置管理和多主机部署系统，不同于任何已经存在的模式，可作为一个适合部署复杂应用程序的基础。Playbook可以定制配置，可以按照指定的操作步骤有序执行，支持同步和异步方式。值得注意的是playbook是通过YAML格式来进行描述定义的。

1、目前两台服务器的主机名：

192.168.20.40

[root@docker02 ~]# hostname

docker02

192.168.20.39

[root@slavedb tmp]# hostname

slavedb

2、Ansible配置

root@docker02 ~]# vim /etc/ansible/hosts

[web]

k8s-master ansible_ssh_host=192.168.20.40

k8s-node3 ansible_ssh_host=192.168.20.39

3、Playbook配置

[root@docker02 ~]# more host.yml

---

- hosts: web

tasks:

- name: hostname

shell: hostnamectl set-hostname {{ inventory_hostname }}

when: ansible_distribution_major_version == "7"

4、执行playbook

[root@docker02 ~]# ansible-playbook host.yml

[root@docker02 ~]# hostname

k8s-master

[root@slavedb tmp]# hostname

k8s-node3

5、主机名写入/etc/hosts

服务器：192.168.20.40

[root@docker02 ~]# cat /etc/hosts

127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4

::1 localhost localhost.localdomain localhost6 localhost6.localdomain6

192.168.20.40 docker02

192.168.20.39 slavedb

服务器：192.168.20.39

127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4

::1 localhost localhost.localdomain localhost6 localhost6.localdomain6

192.168.20.40 docker02

192.168.20.39 slavedb

6、执行playbook

[root@docker02 ~]# more host.yml

---

- hosts: web

tasks:

- name: hostname

shell: hostnamectl set-hostname {{ inventory_hostname }}

when: ansible_distribution_major_version == "7"

- name: modify etc hosts

shell: echo "{{ ansible_ens33['ipv4']['address'] }} {{ inventory_hostname }}" >>/etc/hosts

- debug: var=result

[root@docker02 ~]# ansible-playbook host.yml

7、检查hosts

[root@docker02 ~]# cat /etc/hosts

127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4

::1 localhost localhost.localdomain localhost6 localhost6.localdomain6

192.168.20.40 docker02

192.168.20.39 slavedb

192.168.20.40 k8s-master

[root@slavedb tmp]# cat /etc/hosts |egrep -v "^$|^#" /etc/hosts

127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4

::1 localhost localhost.localdomain localhost6 localhost6.localdomain6

192.168.20.40 docker02

192.168.20.39 slavedb

192.168.20.39 k8s-node3