1.ansible安装

[root@node1 soft]# yum install  ansible -y

2.ansible配置

/etc/ansible/ansible.cfg

[defaults]
host_key_checking = False

/etc/ansible/hosts

#1.初始化主机免密时使用，初始化完成删除该组
[ssh-init]
172.17.16.4  ansible_ssh_user=root ansible_ssh_pass=flink@123
172.17.16.12 ansible_ssh_user=root ansible_ssh_pass=flink@123
172.17.16.13 ansible_ssh_user=root ansible_ssh_pass=flink@123
 #2.通用属性
[ssh-init:vars]
ssh_port=22
 #3.初始化免密后，生产时使用
[product]
172.17.16.4 
172.17.16.12
172.17.16.13

4.编写yaml文件,内容如下

- hosts: ssh-init
  remote_user: root
  vars:
    - name: "ssh-init"
  tasks:
    - name: "1.初始化"
      shell: rm -rf ~/.ssh/* &&  echo {{item.key}} {{item.value.ansible_hostname}}  >> /etc/hosts
      with_dict: "{{hostvars}}"
      #不打印日志
      no_log: True
      #局部打印日志
      #loop_control:
         #label: ""
    - name: "2.生成新的公钥和私钥"
      shell: ssh-keygen -t rsa -b 2048 -P "" -f ~/.ssh/id_rsa
    - name: "3.拷贝远程公钥到本机"
      fetch: src=~/.ssh/id_rsa.pub dest=~/.ssh/rsa/ force=yes
    - name: "4.同步证书到其他主机"
      copy: src=~/.ssh/rsa dest=~/.ssh/ mode=0644
    - name: "5.合并密钥"
      shell: cat ~/.ssh/rsa/*/root/.ssh/id_rsa.pub > ~/.ssh/authorized_keys
    - name: "6.添加known_hosts"
      shell:  ssh-keyscan {{item}} >> /root/.ssh/known_hosts
      with_items: "{{play_hosts}}"
    - name: "7.清理临时数据"
      shell: rm -rf  ~/.ssh/rsa && echo "结束"

5.执行yaml

[root@node1 data]# ansible-playbook ssh-init.yaml 
[DEPRECATION WARNING]: The TRANSFORM_INVALID_GROUP_CHARS settings is set to allow bad characters in group names by 
default, this will change, but still be user configurable on deprecation. This feature will be removed in version 
2.10. Deprecation warnings can be disabled by setting deprecation_warnings=False in ansible.cfg.
 [WARNING]: Invalid characters were found in group names but not replaced, use -vvvv to see details

 [WARNING]: Found variable using reserved name: name


PLAY [ssh-init] *******************************************************************************************************

TASK [Gathering Facts] ************************************************************************************************
ok: [172.17.16.4]
ok: [172.17.16.13]
ok: [172.17.16.12]

TASK [1.初始化] **********************************************************************************************************
changed: [172.17.16.4] => (item=None)
changed: [172.17.16.13] => (item=None)
changed: [172.17.16.12] => (item=None)
changed: [172.17.16.4] => (item=None)
changed: [172.17.16.13] => (item=None)
changed: [172.17.16.12] => (item=None)
changed: [172.17.16.4] => (item=None)
changed: [172.17.16.4]
changed: [172.17.16.13] => (item=None)
changed: [172.17.16.13]
changed: [172.17.16.12] => (item=None)
changed: [172.17.16.12]

TASK [2.生成新的公钥和私钥] ****************************************************************************************************
changed: [172.17.16.4]
changed: [172.17.16.13]
changed: [172.17.16.12]

TASK [3.拷贝远程公钥到本机] ****************************************************************************************************
changed: [172.17.16.4]
changed: [172.17.16.13]
changed: [172.17.16.12]

TASK [4.同步证书到其他主机] ****************************************************************************************************
ok: [172.17.16.4]
changed: [172.17.16.13]
changed: [172.17.16.12]

TASK [5.合并密钥] *********************************************************************************************************
changed: [172.17.16.4]
changed: [172.17.16.13]
changed: [172.17.16.12]

TASK [6.添加known_hosts] ************************************************************************************************
changed: [172.17.16.4] => (item=172.17.16.4)
changed: [172.17.16.12] => (item=172.17.16.4)
changed: [172.17.16.13] => (item=172.17.16.4)
changed: [172.17.16.4] => (item=172.17.16.12)
changed: [172.17.16.13] => (item=172.17.16.12)
changed: [172.17.16.12] => (item=172.17.16.12)
changed: [172.17.16.4] => (item=172.17.16.13)
changed: [172.17.16.13] => (item=172.17.16.13)
changed: [172.17.16.12] => (item=172.17.16.13)

TASK [7.清理临时数据] *******************************************************************************************************
 [WARNING]: Consider using the file module with state=absent rather than running 'rm'.  If you need to use command
because file is insufficient you can add 'warn: false' to this command task or set 'command_warnings=False' in
ansible.cfg to get rid of this message.

changed: [172.17.16.4]
changed: [172.17.16.13]
changed: [172.17.16.12]

PLAY RECAP ************************************************************************************************************
172.17.16.12               : ok=8    changed=7    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   
172.17.16.13               : ok=8    changed=7    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   
172.17.16.4                : ok=8    changed=6    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   

6.测试

[root@node1 data]# ssh 172.17.16.13
Last login: Thu Sep 19 20:27:13 2019 from 172.17.16.4
[root@node3 ~]# exit