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# Ansible의 Fact변수, shell,template를 이용한 OS Package 설치

> OS를 Minimal 설치한 후의 기본적인 환경을 구성한다.

## 주요 기능

- OS Minimal 설치 후 최소한의 Package를 설치한다.
- RedHat/Debian 계열에 따라 조건을 수행한다.


## Inventory 설정

```bash
# cat hosts
[ALL_HOSTS]
172.16.0.100 managed_ip=172.16.0.100 des="2020-12-03"

[ALL_HOSTS_OK]
```

대상 호스트는 172.16.0.100이며, 추가는 2020-12-03에 수행한다. 참고적으로 **ALL_HOSTS_OK** 호스트 그룹은 작업이 완료된 호스트의 history를 위한 그룹이다.


## Host Variables 설정

```bash
# cat host_vars/172.16.0.100
ansible_ssh_host: 172.16.0.100
ansible_ssh_port: SSH_포트번호
ansible_ssh_user: 사용자 아이디
ansible_ssh_pass: "사용자 패스워드"
ansible_become: yes
ansible_become_method: su
ansible_become_user: root
ansible_become_pass: "!root_패스워드"
ansible_python_interpreter: python2.7
```


## Playbook 설정

```python
---
- name: Basic OS Package Installing
  hosts: ALL_HOSTS
  vars:
    time: "{{lookup('pipe','date \"+%Y%m%d_%H%M\"')}}"
  environment:
    LANG: ko_KR.UTF-8
  tasks:
   - name: Copy the banner issue file in remote node
     copy:
      src: templates/issue.j2
      dest: /etc/issue
      owner: root
      group: root
      mode: 0644

   - name: Copy the banner issue.net file in remote node
     copy:
      src: templates/issue.net.j2
      dest: /etc/issue.net
      owner: root
      group: root
      mode: 0644

   - name: Copy the banner issue.net file in remote node
     copy:
      src: templates/motd.j2
      dest: /etc/motd
      owner: root
      group: root
      mode: 0644

   - name: Timezone Setting(Asia/Seoul) Force Linking
     shell: ln -sf /usr/share/zoneinfo/Asia/Seoul /etc/localtime
     register: timezone_result

   - debug: var=timezone_result

   - name: /etc/apt/sources.list_src file copy check
     stat:
       path: /etc/apt/sources.list_src
     register: apt_sourcelist_backup
     when: ansible_os_family == "Debian"

   - name: /etc/apt/sources.list_src file backup
     command: cp -rf /etc/apt/sources.list /etc/apt/sources.list_src
     when: 
       - apt_sourcelist_backup.stat.exists == False
       - ansible_os_family == "Debian"

   - name: APT source sources.list file copy
     copy:
       src: "{{ item }}"
       dest: /etc/apt/sources.list
       owner: 'root'
       group: 'root'
       mode: 0644
     with_items:
       ['sources.list']
     when: ansible_os_family == "Debian"
   
   - name: Install a list of packages
     apt:
       pkg:
         - binutils
         - net-tools
         - dnsutils
         - vim
         - gcc
         - g++
         - cmake
         - smartmontools
         - sysstat
         - lsb-core
         - rdate
         - ntp
         - rsync
         - ntpdate
         - ftp
         - ethtool
         - tcpdump
         - lvm2
         - parted
         - libpam-cracklib
         - mdadm
         - nfs-common
       update_cache: yes
     when: ansible_os_family == "Debian"

   - name: Stop & Disabled Serivces
     systemd:
        name: "{{ item }}"
        state: stopped
        enabled: no
     with_items:
        - exim4
     when: ansible_os_family == "Debian"

   - name: Install a list of packages
      yum: name={{ item }} update_cache=yes
      with_items:
        - vim
        - telnet
        - lvm2
        - sysstat
        - ftp
        - device-mapper-multipath
        - device-mapper-multipath-lib
        - setuptool
        - sysfsutils
        - sg3_utils
        - dos2unix
        - lsof
        - iptstate
        - ipmitool
        - lrzsz
        - zlib-devel
        - tcl
        - tcl-devel
        - cmake
        - nmap
        - iptraf
        - tcpdump
        - net-tools
        - psmisc
        - tree
        - rdate
        - bash-completion
        - wget
        - gcc
        - gcc-c++
        - openssl
        - openssl-devel
        - zip
        - unzip
        - autoconf
        - smartmontools
        - ncurses-devel
        - rsync
        - bind-utils
        - ntp
        - chrony
      when: ansible_os_family == "CentOS"

   - name: Stop & Disabled Serivces
     systemd:
        name: "{{ item }}"
        state: stopped
        enabled: no
     with_items:
        - postfix
     when: ansible_os_family == "CentOS"

```

`OS Package Manager`에 대한 Playbook 분석

* [ ] OS Version의 조건을 수행하기 위해 Facts 변수인 `ansible_os_family` 를 사용한다.
* [ ] Facts 변수를 수집하기 위해서는 반드시 `gather_fact:no` 가 설정되면 안된다.
* [ ] 외부 네트워크가 불가능한 환경에서는 각각 파일을 배포해야 한다.
   - Debian 계열 : /etc/sources.list
   - RedHat 계열 : /etc/yum.respo.d/*.repo


## playbook 실행

```bash
# ansible-playbook -i hosts os_minimal.yml
```