第十三周作业

一、ansible-playbook实现MySQL的二进制部署

[root@control ansible]# tree
.
├── ansible.cfg
├── files
│   ├── my.cnf
│   └── mysql-5.7.33-linux-glibc2.12-x86_64.tar.gz
[root@control ansible]# cat files/my.cnf    
[mysqld]
server-id=1
log-bin
dadadir=/data/mysql
socket=/data/mysql/mysql.sock

log-error=/data/mysql/mysql.log
pid-file=/data/mysql/mysql.pid
[client]
socket=/data/mysql/mysql.sock
[root@control ansible]# vim install_mysql.yml
- name: install mysql 5.7.33
  hosts: test
  gather_facts: no
  vars:
    mysql_version: 5.7.33
    mysql_file: mysql-{{mysql_version}}-linux-glibc2.12-x86_64.tar.gz
    mysql_root_password: wuhaolam
  tasks:
    - name: install packages
      yum:
        name:
          - libaio
          - numactl-libs
          - MYSQL-python
        state: latest
    - name: create mysql group
      group:
        name: mysql
        gid: 306
    - name: create mysql user
      user:
        name: mysql
        uid: 306
        group: mysql
        shell: /sbin/nologin
        system: yes
        create_home: no
        home: /data/mysql
    - name: copy tar to remote host and file mode
      unarchive:
        src: /data/ansible/files/{{mysql_file}}
        dest: /usr/local/
        owner: root
        group: root
    - name: create linkfile
      file:
        src: /usr/local/mysql-{{mysql_version}}-linux-glibc2.12-x86_64
        dest: /usr/local/mysql
        state: link
    - name: create dir
      file:
        path: /data/mysql
        state: directory
        recurse: yes
        mode: '0755'
        owner: mysql
        group: mysql
    - name: data dir
      shell: /usr/local/mysql/bin/mysqld --initialize --user=mysql --datadir=/data/mysql
      tags: data
    - name: config my.cnf
      copy:
        src: /data/ansible/files/my.cnf
        dest: /etc/my.cnf
    - name: service script
      shell: /bin/cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysqld
    - name: PATH variable
      copy:
        content: 'PATH=/usr/local/mysql/bin:$PATH'
        dest: /etc/profile.d/mysql.sh
    - name: enable service
      shell: chkconfig --add mysqld;/etc/init.d/mysqld start
      tags: service
    - name: get password
      shell: awk '/A temporary password/{print $NF}' /data/mysql/mysql.log
      register: password
    - name: change password
      shell: /usr/local/mysql/bin/mysqladmin -uroot -p'{{password.stdout}}' password {{mysql_root_password}}

二、Ansible playbook实现apache批量部署,并对不同主机提供以各自IP地址为内容的index.html

[root@control ansible]# cd roles/                 
[root@control roles]#
[root@control roles]# ansible-galaxy init apache
[root@control roles]# cd ..
[root@control ansible]# vim roles/apache/tasks/main.yml
- name: install apache
  yum:
    name: httpd
    state: latest
- name: start service apache
  service:
    name: httpd
    state: started
    enabled: yes
- name: template a file
  template:
    src: index.html.j2
    dest: /var/www/html/index.html
[root@control ansible]# vim roles/apache/templates/index.html.j2
{{ ansible_default_ipv4.address }}
[root@control ansible]# vim roles.yml
---
- name: use apache
  hosts: all
  roles:
    - apache
[root@control ansible]# ansible-playbook roles.yml
[root@control ansible]# ansible all -a 'curl 127.0.0.1'
[WARNING]: Consider using the get_url or uri module rather than running 'curl'.  If you need to use command because get_url or uri 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.
node5 | CHANGED | rc=0 >>
192.168.119.142  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100    16  100    16    0     0  18867      0 --:--:-- --:--:-- --:--:-- 16000
node4 | CHANGED | rc=0 >>
192.168.119.146  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100    16  100    16    0     0  16000      0 --:--:-- --:--:-- --:--:-- 16000
node1 | CHANGED | rc=0 >>
192.168.119.145  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100    16  100    16    0     0  16000      0 --:--:-- --:--:-- --:--:-- 16000
node3 | CHANGED | rc=0 >>
192.168.119.150  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100    16  100    16    0     0  16000      0 --:--:-- --:--:-- --:--:-- 16000

三、HTTP的报文结构和状态码

HTTP的两种报文——请求报文和回应报文
（1）请求报文

（2）回应报文

3.1 HTTP的报文结构

Method 方法
version 版本
status 状态码
reason-phrase 原因短语
headers 首部字段头
entity-body 实体

3.2 HTTP的常见状态码

200：成功，请求数据通过响应报文的entity-body部分发送；OK
301：请求的URL指向的资源不存在；但在响应报文中通过首部Location指明了资源现在所处的新位置；Moved Permanently
302：同状态码301；但首部Location指明了资源现在所处的新位置Moved Temporarily
304：客户端发出了条件式请求，但服务器上的资源未曾发生改变，则通过响应此状态码通知客户端；Not Modified
307：浏览器内部重定向
401：需要输入账号和密码认证才能访问资源；Unauthorized
403：请求被禁止；Forbidden
404：服务器无法找到客户端请求的资源；Not Found
500：服务器内部错误；Internal Server Error
502：代理服务器从后端服务器收到一条伪响应，如无法连接到网关；Bad Gateway
503：服务不可用，临时服务器维护或过载，服务器无法处理请求
504：网关超时