Ansible流程控制

Ansible流程控制

数据库操作问题:

• 数据库的操作问题，python需要依耐的模块MySQL-python 。

数据库的操作

 # 设置root的密码在，root的密码设置之后，创建用户和创建数据库的操作都需要登陆使用

  - login_user: 'root'
  - login_password: '123'
  - login_host: 'localhost'
  # 三个字段登陆。

 - name: set root pas
      mysql_user:
        name: root
        password: "123"
        host: "localhost"
        priv: '*.*:ALL'
        state: present
      when: ansible_fqdn == "db01"

    - name: create database
      mysql_db:
        login_user: 'root'
        login_password: '123'
        login_host: 'localhost'
        name: wp_db
        state: present
      when: ansible_fqdn == "db01"

    - name: create admin
      mysql_user:
        login_user: 'root'
        login_password: '123'
        login_host: 'localhost'
        name: wp
        password: "123"
        host: "%"
        priv: '*.*:ALL'
        state: present
      when: ansible_fqdn == "db01"

# 数据库有密码，想要操作数据库，得先连接数据库（登录数据库）
login_user: root
login_password: '123'
login_host: localhost
login_port: 3306

导出数据库

[root@db01 ~]# mysqladmin -uroot password "123"

[root@db01 ~]# mysqldump wp_db -uroot -p123 > wp_db.sql

# 导出所有数据库
[root@db01 ~]# mysqldump -A -uroot -p123 >backup.sql

grant all on wp.* to wp_user@'localhost' identified by '111';

导入

mysql -u用户名 -p 数据库名 < 数据库名.sql

[root@db01 ~]# mysql -uroot -p123 < all_databases_backup.sql

判断语句

主机清单

[web_group]
web01 ansible_ssh_host=10.0.0.7
web02 ansible_ssh_host=10.0.0.8

使用when，最大的好处就是，不用重复的收集主机变量，相对于使用多个play的方式。

# web_group中有两台主机web01和web02，使用when语句，只有在web01上安装httpd
[root@m01 ~/ansible]# vi when.yml
- hosts: web_group
  tasks:
    - name: Install httpd
      yum:
        name: httpd
        state: present
      when: ansible_fqdn == "web01"

# 主机名变量官方的推荐写法
[root@m01 ~/ansible]# vi when.yml
- hosts: web_group
  tasks:
    - name: Install httpd
      yum:
        name: httpd
        state: present
      when: ansible_facts['fqdn'] == "web01"

# 此种方式表示的是，通过对不同主机操作系统的判断，来安装不同版本的apache
[root@m01 ~/ansible]# cat when.yml
- hosts: web_group
  tasks:
    - name: Install CentOS Httpd
      yum:
        name: httpd
        state: present
      when: ansible_distribution == "CentOS"

    - name: Install Ubuntu Httpd
      yum:
        name: apache2
        state: present
      when: ansible_facts['os_family'] == "Ubuntu"

还可以使用括号对条件进行分组，多条件的判断

tasks:
  - name: "shut down CentOS 6 and Debian 7 systems"
    command: /sbin/shutdown -t now
    when: (ansible_facts['distribution'] == "CentOS" and ansible_facts['distribution_major_version'] == "6") or (ansible_facts['distribution'] == "Debian" and ansible_facts['distribution_major_version'] == "7")

# 变量加上逻辑运算来判断，上面语句表示为操作系统为CentOS 6的和Debian 7版本的关机

---

也可以指定多条件为列表

tasks:
  - name: "shut down CentOS 6 systems"
    command: /sbin/shutdown -t now
    when:
      - ansible_facts['distribution'] == "CentOS"
      - ansible_facts['distribution_major_version'] == "6"

# 表示CentOs 6的操作系统关闭。

判断语句的模糊匹配

- hosts: all
  tasks:
    - name: Install Rsync Server
      yum:
        name: rsync
        state: present
      when: ansible_fqdn == 'backup' or ansible_fqdn == 'nfs'

    - name: Configure Rsync Conf
      copy:
        src: /root/ansible/rsync/rsyncd.conf
        dest: /etc/rsyncd.conf
      when: ansible_fqdn == 'backup'

    - name: Install Nginx
      yum:
        name: nginx
        state: present
      when: ansible_fqdn is match 'web*'
      # 模糊匹配，表示主机名是web开头的才安装nginx

---

条件运算

tasks:
  - shell: echo "only on Red Hat 6, derivatives, and later"
    when: ansible_facts['os_family'] == "RedHat" and ansible_facts['lsb']['major_release']|int >= 6

# 多条件，操作系统是RedHat且版本大于6的打印，数学运算比较的是整形，所以要在后面使用"|int",把字符型转为整形

通过变量的方式来安装本地的rpm包

[root@m01 ~/ansible]# cat yum.yml
- hosts: web01
  tasks:
    - name: YUM install
      yum:
        name: "{{ var_packages }}"
        state: present
      vars:
        var_packages:
          - /root/nginx_php/mod_php71w-7.1.33-1.w7.x86_64.rpm
          - /root/nginx_php/nginx-1.18.0-1.el7.ngx.x86_64.rpm
          - /root/nginx_php/php71w-cli-7.1.33-1.w7.x86_64.rpm
          - /root/nginx_php/php71w-common-7.1.33-1.w7.x86_64.rpm
          - /root/nginx_php/php71w-devel-7.1.33-1.w7.x86_64.rpm
          - /root/nginx_php/php71w-embedded-7.1.33-1.w7.x86_64.rpm
          - /root/nginx_php/php71w-fpm-7.1.33-1.w7.x86_64.rpm
          - /root/nginx_php/php71w-gd-7.1.33-1.w7.x86_64.rpm
          - /root/nginx_php/php71w-mbstring-7.1.33-1.w7.x86_64.rpm
          - /root/nginx_php/php71w-mcrypt-7.1.33-1.w7.x86_64.rpm
          - /root/nginx_php/php71w-mysqlnd-7.1.33-1.w7.x86_64.rpm
          - /root/nginx_php/php71w-opcache-7.1.33-1.w7.x86_64.rpm
          - /root/nginx_php/php71w-pdo-7.1.33-1.w7.x86_64.rpm
          - /root/nginx_php/php71w-pear-1.10.4-1.w7.noarch.rpm
          - /root/nginx_php/php71w-pecl-igbinary-2.0.5-1.w7.x86_64.rpm
          - /root/nginx_php/php71w-pecl-memcached-3.0.4-1.w7.x86_64.rpm
          - /root/nginx_php/php71w-pecl-mongodb-1.5.3-1.w7.x86_64.rpm
          - /root/nginx_php/php71w-pecl-redis-3.1.6-1.w7.x86_64.rpm
          - /root/nginx_php/php71w-process-7.1.33-1.w7.x86_64.rpm
          - /root/nginx_php/php71w-xml-7.1.33-1.w7.x86_64.rpm

通过注册变量的方式来控制流程

[root@m01 ~/ansible]# vi create.yml
- hosts: web01
  tasks:
    - name: register var
      shell: "ls /root/nginx_php"
      register: directory_info
      ignore_errors: yes
	# 忽略错误
    - name: create web01
      shell: "mv /root/nginx_php /root/web01"
      when: directory_info.rc == 0

# 通过注册变量的方式来判断文件是否存在，然后做出相应的动作。

循环语句

[root@m01 ~/ansible]# cat yum.yml
- hosts: web01
  tasks:
    - name: YUM install
      yum:
        name: /root/nginx_php/{{ item }}
        state: present
      with_items:
        - mod_php71w-7.1.33-1.w7.x86_64.rpm
        - nginx-1.18.0-1.el7.ngx.x86_64.rpm
        - php71w-cli-7.1.33-1.w7.x86_64.rpm
        - php71w-common-7.1.33-1.w7.x86_64.rpm
        - php71w-devel-7.1.33-1.w7.x86_64.rpm
        - php71w-embedded-7.1.33-1.w7.x86_64.rpm
        - php71w-fpm-7.1.33-1.w7.x86_64.rpm
        - php71w-gd-7.1.33-1.w7.x86_64.rpm
        - php71w-mbstring-7.1.33-1.w7.x86_64.rpm
        - php71w-mcrypt-7.1.33-1.w7.x86_64.rpm
        - php71w-mysqlnd-7.1.33-1.w7.x86_64.rpm
        - php71w-opcache-7.1.33-1.w7.x86_64.rpm
        - php71w-pdo-7.1.33-1.w7.x86_64.rpm
        - php71w-pear-1.10.4-1.w7.noarch.rpm
        - php71w-pecl-igbinary-2.0.5-1.w7.x86_64.rpm
        - php71w-pecl-memcached-3.0.4-1.w7.x86_64.rpm
        - php71w-pecl-mongodb-1.5.3-1.w7.x86_64.rpm
        - php71w-pecl-redis-3.1.6-1.w7.x86_64.rpm
        - php71w-process-7.1.33-1.w7.x86_64.rpm
        - php71w-xml-7.1.33-1.w7.x86_64.rpm
# 通过循环的方式来安装包

字典循环

- hosts: web_group
  tasks:
    - name: copy conf and code
      copy:
        src: "{{ item.src }}"
        dest: "{{ item.dest }}"
        mode: "{{ item.mode }}"
      with_items:
        - { src: "./httpd.conf", dest: "/etc/httpd/conf/", mode: "0644" }
        - { src: "./upload_file.php", dest: "/var/www/html/", mode: "0600" }

# 利用列表和字典组合，会循环的访问列表里面的字典，并取出里面的key
# 再配合判断语句的使用来实现对不同主机配置文件的推送