Ansible详细学习笔记和实战案例

Ansible详细学习笔记和实战案例（容易忘记的内容）

一、主机清单

ansible localhost -m command -a "ls"

## 主机列表文件
cat /etc/ansible/hosts

主机描述形式：

• 主机IP地址和主机名

  ## blue.example.com
  ## 192.168.100.1
  

• 散列主机列表和主机组列表

  散列主机列表                     主机组列表                    嵌套主机组列表
  ## blue.example.com            ## [webservers]             ## [server:children]
  ## 192.168.100.1:999           ## beta.example.com         ## webservers
                                 ## 192.168.1.100
  

主机列表范围形式：[起始值:结束值]的ikey:value形式

## www[001:006].example.com                        主机名方式表示6台目标主机
## 192.168.1.10[0:9]                               主机IP地址表示10台目标主机

补充：利用sshpass批量实现基于key验证

ssh-keygen -f /root/.ssh/id_isa -P ''
NET=192.168.100
export SSHPASS=magedu
for IP in {
   1..200};do
	sshpass -e ssh-copy-id $NET.$IP
done

二、Ansible命令操作主机报错

2.1 错误1 Failed to connect to the host via ssh: Permission denied

"msg": "Failed to connect to the host via ssh: Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password)"

1. 检查/etc/ansible/hosts文件是否正确配置主机
2. 删除/root/.sh/known_hosts文件，这个文件存储了错误的凭证

2.2 错误2 Failed to connect to the host via ssh: Warning: Permanetly added

"msg": "Failed to connect to the host via ssh: Warning: Permanetly added "IP" (ECDSA) to the list of known hosts.\r\nPermission denied (publickey,gssapi-keyex,gssapi-with-mic,password)"

说明没有传入主机认证信息，添加-k参数

ansible IP -m command -a "ls" -k

2.3 错误3 Using a SSH password instead of key is not possible

192.168.8.16 | FAILED | rc=-1 >>
Using a SSH passwork instead of a key is not possible because Host key checking is enabled and sshpass does not support this. Please add this  hosts's fingerprint to your known_hosts file to manage this host.

可以从错误中得出，文件knwon_hosts没有这个主机ssh记录

只需要在运行ansible IP -m command -a "ls"添加主机记录

三、相关工具和常见模块

相关工具：

• ansible-doc
• ansible
• ansibe-galaxy
• ansible-pull
• ansible-playbook
• ansible-vault
• ansible-console

常见模块：https://doc.ansible.com/ansible/latest/modules/modules_by_category.heml

修改配置文件/etc/ansible/ansible.cfg中的module_name=shell可改变默认模块为shell

• Command模块：远程主机执行命令，默认模块，可忽略-m选项。不支持$VARNAME< > | ; &等

• shell模块：和command相似，用shell执行命令ansible websrvs -m shell -a 'echo centos | passwd --stdin wang'

• Script模块：远程主机上运行ansible服务器上的脚本

• Copy模块：从ansible服务器主控端复制文件到远程主机

• Fetch模块：从远程主机提取文件到ansible的主控端，copy相反