Automatic operation and maintenance tool ansible

Prepare two machines

192.168.220.140 a.com # # server

192.168.220.145 b.com # # client

1. Install # # install on a.com

Yum install-y epel-release

Yum install-y ansible

two。 Configuration

(1) ssh key configuration

First generate a key pair

Ssh-keygen-t rsa # # you can enter directly without setting the key password. This will generate a .ssh directory under the root home directory, where two files, id_rsa and id_rsa.pub, will also be generated.

Cat / root/.ssh/id_rsa.pub > > / root/.ssh/authorized_keys # # put the id_rsa.pub content in the / root/.ssh/authorized_keys of the other machine, including the local machine

Chmod / root/.ssh/authorized_keys # # configure the permissions of the client authorized_keys file

(2) ansible configuration

Vi / etc/ansible/hosts # # increased

[testhost] # # testhost host group name, custom. The following two ip are the machine ip in the group.

127.0.0.1

B.com

3. Execute command remotely

Ansible testhost-m command-a 'w' # testhost is the name of the host group, and commands can also be executed against a machine.

Error: "msg": "Aborting, target uses selinux but python bindings (libselinux-python) aren't installed!"

Solution: yum install-y libselinux-python

4. Copy a file or directory

The ansible testhost-m copy-a "src=/etc/passwd dest=/tmp/ owner=root group=root mode=0644" # # source directory will be placed under the destination directory.

5. Execute shell script remotely

Vim / tmp/test.sh # # increased

#! / bin/bash

Echo `11111111` > / tmp/1.txt

Ansible testhost-m copy-a "src=/tmp/test.sh dest=/tmp/test.sh mod=0755" # # then distribute the script to each machine

Ansible testhost-m shell-a "/ tmp/test.sh" # # batch execution of the shell script and shell module, also supports remote command execution with pipes

6. Cron

Ansible testhost-m cron-a "name='test cron' job='/bin/touch / tmp/123.txt' weekday=6" # # to delete the cron and add state=absent

7. Yum and service

Ansible testhost-m yum-a "name=httpd"

Ansible testhost-m service-a "name=httpd state=started enabled=yes"

The document uses:

Ansible-doc-l # # lists all modules

Ansible-doc cron # # View the documentation of the specified module