1、roles（角色）介绍

roles(⻆⾊): 就是通过分别将variables, tasks及handlers等放置于单独的⽬录中,并可以便捷地调⽤它们的⼀种机制。

假设我们要写⼀个playbook来安装管理lamp环境，那么这个 playbook就会写很⻓。所以我们希望把这个很⼤的⽂件分成多个功能拆分, 分成apache管理,php管理,mysql管理，然后在需要使⽤的时候直接调⽤就可以了，以免重复写。就类似编程⾥的模块化的概念，以达到代码复⽤的效果。

2、roles目录介绍

files：⽤来存放由copy模块或script模块调⽤的⽂件。

tasks：⾄少有⼀个main.yml⽂件，定义各tasks。

handlers:有⼀个main.yml⽂件，定义各handlers。

templates：⽤来存放jinjia2模板。

vars：有⼀个main.yml⽂件，定义变量。

meta：有⼀个main.yml⽂件，定义此⻆⾊的特殊设定及其依赖关系。

注意: 在每个⻆⾊的⽬录中分别创建files, tasks,handlers,templates,vars和meta⽬录，⽤不到的⽬录可以创建为空⽬录。

3、使用roles安装httpd和mysql

1）创建roles角色基础目录与文件

[root@1 ~]# cd /etc/ansible/roles/

[root@1 roles]# mkdir {httpd,mysql}

[root@1 roles]# mkdir {httpd,mysql}/{tasks,handlers,vars,meta}

[root@1 roles]# touch {httpd,mysql}/{tasks,handlers,vars,meta}/main.yml

[root@1 roles]# tree

├── httpd

│ ├── files

│ ├── handlers

│ │ └── main.yml

│ ├── meta

│ │ └── main.yml

│ ├── tasks

│ │ └── main.yml

│ ├── templates

│ └── vars

│ └── main.yml

├── mysql

├── files

├── handlers

│ └── main.yml

├── meta

│ └── main.yml

├── tasks

│ └── main.yml

├── templates

└── vars

└── main.yml

2）创建playbook调用角色

[root@1 roles]# vim /etc/ansible/playbook/test002.yml

hosts: s

remote_user: root

roles:

httpd
mysql

[root@1 roles]# cd

[root@1 ~]# vim /etc/ansible/roles/mysql/tasks/main.yml

name: 卸载mysql

yum: name=mysql state=absent

name: 安装mysql

yum: name=mysql state=present

[root@1 ~]# vim /etc/ansible/roles/httpd/tasks/main.yml

name: 卸载httpd

yum: name=httpd state=absent

name: 安装httpd

yum: name=httpd state=present

name: 启动httpd

service: name=httpd state=started enabled=yes

[root@1 ~]# ansible-playbook /etc/ansible/playbook/test002.yml

4、练习：使用role来实现lnmp

1、nginx改配置8080

2、mariadb中创建eleme数据库

3、创建表 t_user

id int 主键约束，自增编号

username varchar 非空约束账号

password varchar 非空约束密码

remark varchar 没有约束账号权限说明

1）使用剧本修改nginx的端口号为80

[root@m0 ~]# vim /etc/ansible/playbook/nginx.yml

hosts: s

remote_user: root

tasks:

name: 卸载httpd

yum: name=httpd state=absent

name: 安装nginx

yum: name=nginx state=present

name: 修改资源文件

shell: echo 'i am nginx,port is 80' > /usr/share/nginx/html/index.html

name: 修改端口

command: sed -i '/listen/ s/80/8080/g' /etc/nginx/nginx.conf

notify:

restart nginx
name: 启动服务

service: name=nginx state=started enabled=yes

handlers:

name: restart nginx

service: name=nginx state=restarted

...

[root@m0 ~]# ansible-playbook /etc/ansible/playbook/nginx.yml

2）安装mariadb，命令行形式创建数据库和表

[root@1 ~]# yum -y remove *mariadb*

[root@1 ~]# yum -y install mariadb

[root@1 ~]# yum -y install mariadb-server.x86_64

[root@1 ~]# yum -y install mariadb-devel.x86_64

[root@1 ~]# systemctl start mariadb

[root@1 ~]# mysql

MariaDB [(none)]> quit

Bye

[root@1 ~]# mysql << EOF

> create database if not exists eleme charset utf8mb4;

> use eleme;

> create table user(id int primary key auto_increment,username varchar(45) not null,password varchar(45) not null,remark varchar(45));

> quit

> EOF

[root@1 ~]# mysql

MariaDB [(none)]> show databases;

+--------------------+

| Database |

+--------------------+

| information_schema |

| eleme |

| mysql |

| performance_schema |

| test |

+--------------------+

5 rows in set (0.00 sec)

MariaDB [test]> use eleme;

Database changed

MariaDB [eleme]> show tables;

+-----------------+

| Tables_in_eleme |

+-----------------+

| user |

+-----------------+

1 row in set (0.00 sec)

3）使用roles安装mariadb并执行脚本创建数据库和表

[root@1 ~]# cd /etc/ansible/roles/

[root@1 roles]# cp -r httpd mariadb

[root@1 roles]# cd mariadb/

[root@1 mariadb]# ls

files handlers meta tasks templates vars

[root@1 mariadb]# vim tasks/main.yml

name: 卸载mariadb

yum: name=mariadb,mariadb-server,mariadb-devel state=absent

name: 安装mariadb

yum: name=mariadb,mariadb-server,mariadb-devel state=present

name: 启动mariadb

service: name=mariadb state=started enabled=yes

name: 执行脚本，创建数据库和数据表

script: /etc/ansible/script/dbtable.sh

[root@1 mariadb]# cd /etc/ansible/

[root@1 ansible]# mkdir script

[root@1 ansible]# cd script/

[root@1 script]# vim dbtable.sh

#!/bin/bash

mysql << EOF

create database if not exists eleme charset utf8mb4;

use eleme;

create table t_user(

id int primary key auto_increment,

username varchar(45) not null,

password varchar(45) not null,

remark varchar(45)

);

quit

EOF

[root@1 script]# vim /etc/ansible/playbook/test003.yml

hosts: s

remote_user: root

roles:

mariadb

[root@1 script]# cd /etc/ansible/playbook/

[root@1 playbook]# ansible-playbook test003.yml

下午

配置⼀主⼆从的mysql服务器 mysql57

1）mysql服务器端⼝3306，不要关闭防⽕墙

主从配置

[root@mysql57 ~]# firewall-cmd --permanent --add-port=3306/tcp

success

[root@mysql57 ~]# firewall-cmd --reload

success

[root@mysql57 ~]# firewall-cmd --list-ports

3306/tcp

96 yum -y install lrzsz

66 tar -zxf mysql-5.7.44-linux-glibc2.12-x86_64.tar.gz

67 cp -r mysql-5.7.44-linux-glibc2.12-x86_64 /usr/local/mysql

68 mkdir /usr/local/mysql/mysql-files

69 useradd -r -s /sbin/nologin mysql

70 chown mysql:mysql /usr/local/mysql/mysql-files/

71 chmod 750 /usr/local/mysql/mysql-files/

72 rm -rf /etc/my.cnf

主配置

73 /usr/local/mysql/bin/mysqld --initialize --user=mysql --basedir=/usr/local/mysql

74 /usr/local/mysql/bin/mysql_ssl_rsa_setup --datadir=/usr/local/mysql/data

76 cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysql57

77 service mysql57 start

79 sed -i ' $aexport PATH=/usr/local/mysql/bin:$ PATH' /etc/profile

80 source /etc/profile

vim /usr/local/mysql/my.cnf

[mysqld]

basedir=/usr/local/mysql

datadir=/usr/local/mysql/data

socket=/tmp/mysql.sock

activate_all_roles_on_login=on

port=3306

log-error=/usr/local/mysql/data/db01-master.err

log-bin=/usr/local/mysql/data/binlog

server-id=10

character_set_server=utf8mb4

service mysql57 restart

81 mysql -p'zc0fLfoM%SDP'

mysql> alter user 'root'@'localhost' identified by '123';

Query OK, 0 rows affected (0.15 sec) //修改root密码

mysql> create user 'slave0'@'%' identified by '123';

Query OK, 0 rows affected (0.03 sec) //创建slave用户

mysql> grant replication slave on *.* to 'slave0'@'%';

Query OK, 0 rows affected (0.02 sec) //授予replication slave权限

mysql> flush privileges; //重新加载权限表

Query OK, 0 rows affected (0.00 sec)

mysql> flush tables with read lock; //刷新所有表并施加一个全局读锁

Query OK, 0 rows affected (0.01 sec)

mysql> show master status; //查看主服务器当前二进制日志的状态信息

+---------------+----------+--------------+------------------+-------------------+

+---------------+----------+--------------+------------------+-------------------+

| binlog.000003 | 1178 | | | |

+---------------+----------+--------------+------------------+-------------------+

1 row in set (0.00 sec)

rm -rf /usr/local/mysql/data/auto.cnf

rsync -av /usr/local/mysql/data root@10.0.0.58:/usr/local/mysql/

rsync -av /usr/local/mysql/data root@10.0.0.59:/usr/local/mysql/

从配置

cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysql57

service mysql57 start

sed -i ' $aexport PATH=/usr/local/mysql/bin:$ PATH' /etc/profile

source /etc/profile

vim /usr/local/mysql/my.cnf

[mysqld]

basedir=/usr/local/mysql

datadir=/usr/local/mysql/data

socket=/tmp/mysql.sock

activate_all_roles_on_login=on

port=3310

log-error=/usr/local/mysql/data/db01-slave.err

relay-log=/usr/local/mysql/data/relaylog

server-id=11

character_set_server=utf8mb4

service mysql57 restart

mysql -p'123'

mysql> change master to

-> master_host='10.0.0.57',

-> master_user='slave0',

-> master_password='123',

-> master_port=3306,

-> master_log_file='binlog.000003',

-> master_log_pos=1178;

Query OK, 0 rows affected, 9 warnings (0.02 sec)

mysql> start slave;

Query OK, 0 rows affected, 1 warning (0.03 sec)

mysql> show slave status\G

*************************** 1. row ***************************

Slave_IO_State: Waiting for source to send event

Master_Host: 10.0.0.57

Master_User: slave

Master_Port: 3306

Connect_Retry: 60

Master_Log_File: binlog.000003

Read_Master_Log_Pos: 1178

Relay_Log_File: relaylog.000002

Relay_Log_Pos: 323

Relay_Master_Log_File: binlog.000003

Slave_IO_Running: Yes

Slave_SQL_Running: Yes

2）在mysql中添加eleme数据库设置为utf8mb4

[root@mysql57 ~]# mysql -p'123'

mysql> create database if not exists eleme charset utf8mb4;

Query OK, 1 row affected (0.00 sec)

mysql> show databases;

+--------------------+

| Database |

+--------------------+

| information_schema |

| eleme |

| mysql |

| performance_schema |

| sys |

+--------------------+

6 rows in set (0.00 sec)

3）添加表t_user

mysql> create table eleme.t_user(

-> id int not null primary key,

-> name varchar(32) not null,

-> username varchar(32) not null,

-> password varchar(32) not null,

-> remark varchar(32) not null

-> );

Query OK, 0 rows affected (0.01 sec)

mysql> desc eleme.t_user;

+----------+--------------+------+-----+---------+-------+

+----------+--------------+------+-----+---------+-------+

| id | int(11) | NO | PRI | NULL | |

+----------+--------------+------+-----+---------+-------+

5 rows in set (0.02 sec)

4）添加2⾏记录

mysql> insert into eleme.t_user values(1,'超级管理员','admin','admin','超级管理员'),(2,'普通用户','guest','guest','普通用户');

Query OK, 2 rows affected (0.00 sec)

Records: 2 Duplicates: 0 Warnings: 0

mysql> select * from eleme.t_user;

+----+-----------------+----------+----------+-----------------+

+----+-----------------+----------+----------+-----------------+

+----+-----------------+----------+----------+-----------------+

2 rows in set (0.00 sec)

5）使⽤mycat为3台数据库设置负载均衡（读写分离）

[root@mycat ~]# systemctl stop firewalld

[root@mycat ~]# systemctl disable firewalld

[root@mycat ~]# ls

anaconda-ks.cfg Mycat-server-1.6.5-release-20180122220033-linux.tar.gz

jdk-8u192-linux-x64.tar.gz v

[root@mycat ~]# tar -xf jdk-8u192-linux-x64.tar.gz

[root@mycat ~]# tar -xf Mycat-server-1.6.5-release-20180122220033-linux.tar.gz

[root@mycat ~]# cp -r jdk1.8.0_192/ /usr/local/jdk

[root@mycat ~]# cp -r mycat/ /usr/local/

[root@mycat ~]# ls /usr/local/jdk/

bin lib src.zip

include man THIRDPARTYLICENSEREADME.txt

javafx-src.zip README.html

jre release

[root@mycat ~]# sed -i '$aexport JAVA_HOME=/usr/local/jdk' /etc/profile

[root@mycat ~]# source /etc/profile

[root@mycat ~]# $JAVA_HOME

-bash: /usr/local/jdk: 是一个目录

[root@mycat ~]# sed -i ' $aexport PATH=$ PATH:$JAVA_HOME/bin' /etc/profile

[root@mycat ~]# source /etc/profile

[root@mycat ~]# $PATH

-bash: /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/usr/local/jdk/bin: 没有那个文件或目录

[root@mycat ~]# javac -version

javac 1.8.0_192

[root@mycat ~]# ls /usr/local/mycat/

bin catlet conf lib logs version.txt

[root@mycat ~]# ll /usr/local/mycat/

总用量 12

drwxr-xr-x. 2 root root 190 8月 15 15:19 bin

drwxr-xr-x. 2 root root 6 8月 15 15:19 catlet

drwxr-xr-x. 4 root root 4096 8月 15 15:19 conf

drwxr-xr-x. 2 root root 4096 8月 15 15:19 lib

drwxr-xr-x. 2 root root 6 8月 15 15:19 logs

-rwxr-xr-x. 1 root root 219 8月 15 15:19 version.txt

[root@mycat ~]# ls /usr/local/mycat/bin/mycat

[root@mycat ~]# vim /usr/local/mycat/conf/server.xml

<property name="schemas">eleme</property>

<!--

</schema>

</privileges>

-->

</user>

<!--

<property name="schemas">TESTDB</property>

</user>

-->

[root@mycat ~]# vim /usr/local/mycat/conf/schema.xml

[root@mycat ~]# /usr/local/mycat/bin/mycat start

Starting Mycat-server...

[root@mycat ~]# netstat -lnput | grep 8066

tcp6 0 0 :::8066 :::* LISTEN 1336/java

6、配置静态资源服务器，为前段提供图⽚和视频

7、部署2台有java17.0.3环境的后端服务器，端⼝8080，不关防⽕墙

8、部署nginx代理java服务器，负载均衡策略为轮询问，端⼝为80

8.21

主从配置

主配置

从配置